JPH1094068A - Remote control unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a remote control unit which can prevents unintended operation when a receiving radio wave is ceased. SOLUTION: A transmitter 23 send an operation code signal F having a rise code F2a or fall code F2b set as a function code F2 with a rise or fall switch 3 or 4 and sends an operation code signal F having a rise continuation code F2d or fall continuation code F2e set as the function code F2 when the rise or fall switch 3 or 4 is continuously operated. A receiver 25 moves a tail gate up or down by driving and controlling an actuator 17 according to the rise code F2a or fall code F2b of the function code F2. Further, the receiver 25 holds the last state according to the rise continuation code F2d or fall continuation code F2e of the function code F2. Then when the operation code signal is ceased, the actuator 17 is driven and controlled to stop the tail gate from moving up or down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a remote control device for operating a tailgate lifter of a truck with a tailgate lifter.

[0002]

2. Description of the Related Art In a truck with a tailgate lifter, a rear gate of a loading platform is raised and lowered as a lift in order to streamline loading and unloading of cargo. The tailgate is raised and lowered by operating a hydraulic pump powered by a vehicle battery and sending hydraulic oil to a hydraulic cylinder. When the tailgate is lowered, the hydraulic oil is discharged and lowered by excessive load on the hydraulic cylinder.

The control of these actuators is performed by, for example, a wireless remote control device. FIG. 9 shows an example of the remote control device. The transmitter 1 is provided with a power switch 2 and an up switch 3 and a down switch 4 as operation switches. The power switch 2 is for operating the CPU 5, and the CPU 5 starts a transmission operation based on the operation. The CPU 5 is provided with an auto power-off function. The CPU 5 automatically stops operation after a certain period of time from the operation of the power switch 2 or after a certain period of time from the end of the operation of the up switch 3 or the down switch 4. Reduce power consumption.

[0004] The up switch 3 is a switch for raising the tail gate, and the down switch 4 is for lowering the tail gate. When starting the transmission operation, the CPU 5 outputs a transmission signal based on the operation of the up switch 3 and the down switch 4 to the RF transmission circuit 6,
The transmission circuit 6 places the transmission signal on a carrier wave and
Output from

As shown in FIG. 10, an operation code signal F
Is composed of an identification code F1, a function code F2, and an error correction code F3. The identification code F1 is a code composed of a plurality of bits (for example, 16 bits),
It is set and stored in advance for each transmitter 1. The function code F2 is a code composed of a plurality of bits (for example, 4 bits), and is set in advance corresponding to the operation of the operation switch.

As shown in FIG. 11, an up code F2a, a down code F2b, and a stop code F2c are set and stored in advance in the function code F2. Ascent code F2
“a” is set in accordance with the operation of the up switch 3, and the down code F 2 b is set in accordance with the operation of the down switch 4. The stop code F2c is set corresponding to the case where both switches 3 and 4 are not operated.

When the up switch 3 or the down switch 4 is operated, the CPU 5 sets the up code F2a or the down code F2b to the function code F2, and the function code F2
And an operation code signal F including an identification code F1 and an error correction code F3. The range from the identification code F1 to the error correction code F3 is called one frame. And
The operation code signal F of one frame including the ascending code F2a or the descending code F2b is illustrated as “ON” in FIG. 12, and is hereinafter referred to as an ON frame. The CPU 5 repeatedly transmits an ON frame while the up switch 3 or the down switch 4 is being operated.

When the up switch 3 and the down switch 4 are not operated, the CPU 5 outputs a stop code F2.
c is a function code F2, and an operation code signal F of one frame including the function code F2, the identification code F1, and the error correction code F3 is generated. This stop code F2
In FIG. 12, the transmission signal of one frame including the “c”
F ", and is hereinafter referred to as an OFF frame. CPU5
Transmits the OFF frame repeatedly while the up switch 3 and the down switch 4 are not operated.

A receiver 9 for receiving the carrier signal output from the transmitter 1 is provided on a truck. The power supply circuit 11 of the receiver 9 generates a predetermined power supply voltage based on the battery voltage supplied from the vehicle-mounted battery 10 and supplies it to the CPU 12.

The RF receiving circuit 13 receives a carrier signal transmitted from the transmitter 1 via the antenna 14, demodulates the carrier signal into an operation code signal F, and outputs the operation code signal F to the CPU 12. Power is supplied from the power supply circuit 11 to the RF reception circuit 13 via the intermittent control circuit 15. Intermittent control circuit 1
5 always supplies power to the RF receiving circuit 13 intermittently. Then, the RF receiving circuit 13 outputs the operation code signal F to C
When output to the PU 12, the intermittent control circuit 1
5, the intermittent control circuit 15
, The power is supplied to the RF receiving circuit 13 continuously.

The CPU 12 outputs a control signal to a relay circuit 16 based on an operation code signal F output from the RF receiving circuit 13, and the relay circuit 16 drives an actuator 17 based on the control signal. Then, the elevation of the tailgate is controlled based on the operation of the actuator 17.

The operation of the above remote control device will be described with reference to FIG. When the power switch 2 of the transmitter 1 is not turned on, the power P1 is not supplied to the CPU 5 and the RF transmission circuit 6, and the RF transmission circuit 6 does not output a transmission signal. In the receiver 9, since no transmission signal is output from the transmitter 1, the power P2 is intermittently supplied from the intermittent control circuit 15 to the RF receiving circuit 13,
The receiving circuit 13 is activated intermittently. With such an operation, power consumption by the RF receiving circuit 13 is reduced.

When the power switch 2 is operated, the CPU 5
The power supply P1 is supplied to the RF transmission circuit 6 and the output of the transmission signal from the RF transmission circuit 6 is started. Then, in the receiver 9, the intermittently operating RF receiving circuit 13 transmits the transmitter 1.
And outputs a reception signal to the CPU 12. Then, based on the operation code signal F, CP
The power P2 is continuously supplied to the RF receiving circuit 13 by the control signal output from the U12 to the intermittent control circuit 15,
The RF receiving circuit 13 operates continuously.

Next, the up switch 3 or the down switch 4 of the transmitter 1 is operated, and the operation signal OP1 is output from the CP.
When input to U5, an operation code signal F including an ascending code F2a or a descending code F2b based on the operation signal OP1 is modulated by the RF transmission circuit 6 and output.

In the receiver 9, the received signal is demodulated by the RF receiving circuit 13 and output to the CPU 12. CPU 12
Drives and controls the relay circuit 16 for each frame of the received signal. For example, when the received frame is an ON frame including the rising code F2a or the falling code, the CPU 12 outputs a control signal for driving the relay circuit 16, and the relay circuit 16 drives the actuator 17 based on the control signal. The load driving signal LD1 is output.
Then, based on the operation of the up switch 3 or the down switch 4, the tail gate is raised or lowered.

On the other hand, when the received frame is the OFF frame including the stop code F2c, the CPU 12 controls the relay circuit 16 to stop the output of the load drive signal LD1, and the tail gate raising or lowering operation is stopped. You.

When a predetermined time elapses after the operation of the up switch 3 or the down switch 4 is completed, the operation of the CPU 5 is stopped based on the auto power off function, and the transmission from the RF transmission circuit 6 is stopped.

Then, in the receiver 9, the received signal is transmitted to the CPU 1
2, the intermittent control circuit 1
5 based on the control signal output to the
Is supplied intermittently, and the RF receiving circuit 13 is activated intermittently.

[0019]

By the way, when the operator leaves the truck while operating the up switch 3 or the down switch 4, there may be a case where the received signal is interrupted due to the surrounding noise or the like. For example, the receiver 9
When the frame Fa shown in FIG. 12 is interrupted while the ON frame is being received, the output of the load drive signal LD1 is stopped to control the drive of the actuator 17, and the raising or lowering of the tailgate is stopped.

Thereafter, when the operator approaches the truck while operating the up switch 3 or the down switch 4, the receiver 9 receives the transmission signal from the transmitter 1 again,
The CPU 12 receives a reception signal. Then, the receiver 9 returns to the ON frame (ON frame Fb in FIG. 12).
Is received, the load drive signal LD1 is output, and the tailgate starts operating again.

The timing at which the tail gate starts to move, that is, the timing at which a received signal is input to the CPU 12, is undefined. Therefore, the tailgate may start moving again at a timing not intended by the operator.

An object of the present invention is to provide a remote control device capable of preventing unintended operation when received radio waves are interrupted.

[0023]

According to a first aspect of the present invention, an operation code signal including a function code based on the operation of an operation switch is mounted on a carrier wave by a transmission circuit and transmitted as a transmission signal. A remote control device including a transmitter for outputting, and a receiver for demodulating the operation code signal from the transmission signal by a receiving circuit and outputting a load driving signal based on a function code included in the operation code signal. In the transmitter, an operation code setting means for setting an operation code to a function code when an operation switch is operated, and in place of the operation code when the operation switch is continuously operated. Code changing means for setting a continuation code to a function code, wherein the operation code is set to the function code in the receiver. A load drive means for outputting the load drive signal in case, a load stop means for stopping the output of the load driving signal when the transmission signal is not received,
When the continuation code is set in the function code, a state holding means for holding a load state at that time is provided.

The invention described in claim 2 is the first invention.
The remote control device according to claim 1, wherein the transmitter further includes a stop code setting unit configured to set a stop code in the function code when an operation switch is not operated, and a load stop provided in the receiver. Means are
The gist is that output of the load drive signal is stopped when the transmission signal is no longer received or when a stop code is set in the function code.

The third aspect of the present invention is the first aspect of the present invention.
Or the remote control device according to 2, wherein the transmitter includes transmission number measurement means for measuring the number of transmissions of a transmission signal including a function code having an operation code set by the operation code setting means, and The means is based on a measurement result of the transmission count measuring means,
The gist is that the continuation code is set to a function code when a transmission signal is transmitted a predetermined number of times.

The invention described in claim 4 is the first invention.
4. In the remote control device according to any one of Items 3 to 3, the transmitter includes a plurality of operation switches, and the operation code setting unit sets operation codes corresponding to the plurality of operation switches to the function codes. That is the gist.

The invention described in claim 5 is the same as the invention in claim 4.
Wherein the code changing means sets a continuation code corresponding to each of the plurality of operation switches to a function code instead of the operation code.

Therefore, according to the first aspect of the present invention,
The transmitter is provided with operation code setting means and code changing means. The operation code setting means sets the operation code to the function code when the operation switch is operated. When the operation switch is continuously operated, the code changing unit sets the continuation code as the function code instead of the operation code. The receiver includes a load driving unit, a load stopping unit, and a state holding unit. The load driving unit outputs a load driving signal when the operation code is set in the function code, and the load stopping unit stops outputting the load driving signal when the transmission signal is no longer received.
When the continuation code is set in the function code, the state holding unit holds the state of the load at that time.

According to the second aspect of the present invention, the transmitter further includes stop code setting means for setting a stop code in the function code when the operation switch is not operated. The load stop means provided in the device stops output of the load drive signal when the transmission signal is no longer received or when a stop code is set in the function code.

According to the third aspect of the present invention, the transmitter is provided with transmission number measuring means for measuring the number of transmissions of a transmission signal including a function code having an operation code set by the operation code setting means. Provided, and the code changing means is:
A continuation code is set as a function code when a transmission signal is transmitted a predetermined number of times based on the measurement result of the transmission number measurement means.

According to the fourth aspect of the present invention, the transmitter is provided with a plurality of operation switches, and the operation code setting means sets operation codes corresponding to the plurality of operation switches to function codes. You.

According to the fifth aspect of the present invention, the code changing means sets the continuation codes respectively corresponding to the plurality of operation switches as the function codes instead of the operation codes.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. The same components as those in the conventional example will be described with the same reference numerals.

As shown in FIG. 8, the truck 21 with the tailgate lifter is capable of raising and lowering the tailgate 22 at the rear end of the luggage compartment by hydraulic pressure, thereby streamlining the loading and unloading of cargo.
The tailgate lifter is controlled by an actuator, and the actuator is controlled by a remote control device including a transmitter 23 and a receiver 25.

The transmitter 23 is portable and has a power switch 2, an up switch 3 and a down switch 4.
The receiver 25 is provided at the rear of the luggage compartment of the truck 21 and outputs a load drive signal for driving the actuator based on a transmission signal from the transmitter 23.

FIG. 1 shows a specific configuration of the transmitter 23 and the receiver 25. The power switch 2, the up switch 3, and the down switch 4 of the transmitter 23 have the same configuration as that of the conventional example. Each of the switches 2 to 4 is connected to the CPU 24.
The CPU 24 is composed of a one-chip microcomputer, and includes a ROM 24a, a RAM 24b as storage means, and a timer 2
4c. A transmission program for the transmitter 23 to perform a transmission operation is stored in the ROM 24a. CPU2
4 is activated based on the operation of the power switch 2 and outputs a transmission signal based on the operation of the up switch 3 and the down switch 4 as operation switches to the RF transmission circuit 6 based on a transmission program, and the RF transmission circuit 6 The transmission signal is modulated by a predetermined method, mounted on a carrier wave, and output from the antenna 8.

As shown in FIG. 3, the ROM 24a stores a rise code F2a, a fall code F2b, a stop code F2c, a rise continuation code F2d, and a fall continuation code F2e. The identification code F1 is composed of a plurality of bits (for example, 16 bits), and is set and stored in advance for each transmitter 23. Ascending code F2a, descending code F
2b, ascending continuation code F2d, descending continuation code F2e,
The stop code F2c has a plurality of bits (for example, 4 bits), and is set and stored in advance in accordance with the operation of the up switch 3 and the down switch 4.

Ascending code F2a and ascending continuation code F2
d corresponds to the case where the up switch 3 is operated, and the down code and the down continuation code F2e correspond to the case where the down switch 4 is operated. The stop code F2c is
This corresponds to a case where the up switch 3 and the down switch 4 are not operated.

When starting the transmission operation, the CPU 24 generates an operation code signal F having one frame of the identification code F1, the function code F2, and the error correction code F3 as shown in FIG. The function code F2 includes an ascending code F2a, a descending code F2b, and a stop code F2 shown in FIG.
c, ascending continuation code F2d, and descending continuation code F2
Any one of e is set.

As shown in FIG. 4, when the up switch 3 is operated, the CPU 24 stores the up code F2a in the function code F2, and stores the function code F2 and the identification code F1.
From this, the value of the error correction code F3 is calculated. CPU 24
Generates an operation code signal F of one frame including an identification code F1, a function code F2, and an error correction code F3. Then, the CPU 24 transmits the generated operation code signal F via the RF transmission circuit 6.

Operation code signal F including ascending code F2a
When the ascending switch 3 is continuously operated after transmitting the predetermined number of frames, the CPU 24
The ascending continuation code F2d is stored in the function code F2 instead of the ascending code F2a, and the value of the error correction code F3 is calculated from the function code F2 and the identification code F1. CPU
24 generates an operation code signal F of one frame including an identification code F1, a function code F2, and an error correction code F3. Then, the CPU 24 transmits the generated operation code signal F via the RF transmission circuit 6. The operation code signal F including the ascending continuation code F2d is continuously transmitted while the ascending switch 3 is operated.

That is, when the ascending switch 3 is operated, the transmitter 23 first transmits the operation code signal F including the ascending code F2a in a plurality of frames, and then operates the ascending switch 3 to operate the operation code signal F including the ascending continuation code F2d. While it is being sent.

In FIG. 4, 1 including the ascending code F2a
The operation code signal F of the frame is illustrated as “ON”,
Hereinafter, this one frame is called an ON frame. Also, the operation code signal F of one frame including the ascending continuation code F2d
Is shown as “CONT”, and this one frame is hereinafter referred to as C
This is called an ONT frame.

When the down switch 4 is operated, the CPU
24 operates in the same manner as when the up switch 3 is operated. That is, when the down switch 4 is operated, the CPU 24 stores the down code F2b in the function code F2, and calculates the value of the error correction code F3 from the function code F2 and the identification code F1. The CPU 24 determines the identification code F
1, a one-frame operation code signal F including a function code F2 and an error correction code F3 is generated. Then, the CPU 24 transmits the generated operation code signal F to R
The signal is transmitted via the F transmission circuit 6.

Operation code signal F including descending code F2b
When the down switch 4 is continuously operated after transmitting the predetermined number of frames, the CPU 24
The descent continuation code F2e is stored in the function code F2 instead of the descent code F2b, and the value of the error correction code F3 is calculated from the function code F2 and the identification code F1. CPU
24 generates an operation code signal F of one frame including an identification code F1, a function code F2, and an error correction code F3. Then, the CPU 24 transmits the generated operation code signal F via the RF transmission circuit 6. The operation code signal F including the descending continuation code F2e is continuously transmitted while the descending switch 4 is operated.

That is, when the down switch 4 is operated, the transmitter 23 first transmits the operation code signal F including the down code F2b for a plurality of frames, and then operates the down switch 4 to operate the operation code signal F including the down continuation code F2e. While it is being sent. As in the case of including the ascending code F2a, the one-frame operation code signal F including the descending code F2b is hereinafter referred to as an ON frame, and the descending continuation code F2
The operation code signal F of one frame including e
Call it a frame.

Further, when the up and down switches 3 and 4 are not operated, the CPU 24 sets the stop code F2.
c is stored in the function code F2, and the value of the error correction code F3 is calculated from the function code F2 and the identification code F1. The CPU 24 includes an identification code F1, a function code F2,
Then, an operation code signal F of one frame including the error correction code F3 is generated. Then, the CPU 24 transmits the generated operation code signal F via the RF transmission circuit 6. In FIG. 4, the operation code signal F of one frame including the stop code F2c is shown as "OFF", and this one frame is hereinafter referred to as an OFF frame.

The timer 24c is used to stop the transmission operation of the transmitter 23. That is, the CPU of the transmitter 23
24 is a power switch 2 based on the value of the timer 24c.
Then, it is determined whether or not a predetermined time has elapsed since the start of the transmission operation or a predetermined time has elapsed from the end of the operation of the up switch 3 or the down switch 4 based on the above operation. And CPU2
No. 4 continues the transmission operation when the fixed time has not elapsed, and automatically stops the transmission operation when the fixed time has elapsed.
The RF transmission circuit 6 performs a modulation operation when the operation code signal F is input from the CPU 24, and stops operating when the operation code signal F is no longer input. Therefore, when the CPU 24 stops the transmission operation and the operation code signal F is not input, the RF transmission circuit 6 does not operate, so that the power of the battery 7 is not consumed.

As shown in FIG. 1, the receiver 25 is provided with the same RF receiving circuit 13 as the conventional one. The RF receiving circuit 13 is connected to the CPU 26. RF receiving circuit 13
Receives the transmission signal from the transmitter 23 via the antenna 14 and demodulates the received transmission signal to generate the operation code signal F. The generated operation code signal F is transmitted to the CPU
26.

The CPU 26 is formed of a one-chip microcomputer and includes a ROM 26a, a RAM 26b, and a timer 26c as storage means. The ROM 26a stores a receiving program for the receiver 25 to perform a receiving operation.

The CPU 26 intermittently outputs the control signal C1 to the intermittent control circuit 15 for a fixed time based on the receiving program. The intermittent control circuit 15 intermittently supplies the power P to the RF receiving circuit 13 for a certain time based on the control signal C1, and the RF receiving circuit 13
It operates for a fixed time based on

When a transmission signal is transmitted from the transmitter 23 while the RF reception circuit 13 operates for a certain period of time, the RF reception circuit 13 receives the transmission signal to be transmitted via the antenna 14 and receives the transmission signal. An operation code signal F is generated by demodulating the transmitted signal. Then, the RF receiving circuit 13 outputs the generated operation code signal F to the CPU 26. CPU
26 receives the operation code signal F from the RF receiving circuit 13 and continuously outputs the control signal C1 to the intermittent control circuit 15. The intermittent control circuit 15 continuously supplies the power P to the RF receiving circuit 13 based on the control signal C1,
The receiving circuit 13 operates continuously based on the supplied power P.

Further, every time the CPU 26 inputs the operation code signal F of one frame from the RF receiving circuit 13, the CPU 26 drives the relay circuit 16 based on the frame, that is, the function code F2 included in the operation code signal F. Control. As described above, the function code F2 included in the operation code signal F may be a rise code F2a, a rise continuation code F2d, a fall code F2b, a fall continuation code F2e, or a stop code F2c.

When the operation code signal F is an ON frame, that is,
The function code F2 is an ascending code F2a or a descending code F2
In the case of b, the CPU 26 sends the control signal C to the relay circuit 16.
2 and the relay circuit 16 outputs a load drive signal LD1 based on the control signal C2 to
Drive control.

The actuator 17 comprises an ascending actuator 17a and a descending actuator 17b. When the lifting actuator 17a is driven based on the load drive signal LD1, hydraulic oil is supplied to the hydraulic cylinder based on the operation of the lifting actuator 17a, and the tailgate 22 is raised. When the lowering actuator 17b is driven based on the load drive signal LD1, the hydraulic oil is discharged from the hydraulic cylinder based on the operation of the lowering actuator 17b, and the tailgate 22 is lowered.

When the operation code signal F is an OFF frame, that is, when the function code F2 is a stop code F2c,
The CPU 26 stops outputting the control signal C2 to the relay circuit 16. Then, the relay circuit 16 outputs the load drive signal LD.
1 is stopped, and the raising operation or the lowering operation of the tail gate 22 is stopped.

Further, when the operation code signal F is a CONT frame, that is, when the function code F2 is a rising continuation code F2d or a falling continuation code F2e, the CPU 26 sets the CO
The state before the input of the NT frame is held. CON
When a T frame is input, there are a case where the tail gate 22 moves up or down and a case where the tail gate 22 stops. The CPU 26 controls the tail gate 22
When the CONT frame is input while the signal is rising or falling, the state is maintained, so that the tail gate 22 continues to move up or down. Further, when the CPU 26 inputs the CONT frame while the tail gate 22 is stopped, the CPU 26 maintains the state.
Remains stopped.

When the operation code signal F is interrupted, the CPU 26 stops outputting the control signal C2 to the relay circuit 16. Then, the relay circuit 16 outputs the load drive signal LD.
1 is stopped, and the raising operation or the lowering operation of the tail gate 22 is stopped.

When the up switch 3 or the down switch 4 is operated, the transmitter 23 first transmits a plurality of ON frames of the operation code signal F including the up code F2a or the down code F2b. Next, the transmitter 23 replaces the ascending code F2a or the descending code F2b with the ascending continuation code F.
Operation code signal F including 2d or descending continuation code F2e
Is continuously output while the up switch 3 or the down switch 4 is operated.

Therefore, first, a plurality of ON frames are input to the receiver 25, and based on the ON frames, the load drive signal LD1 is output, the drive of the actuator 17 is controlled, and the tail gate 22 is raised or lowered. Next, since the CONT frame is input to the receiver 25,
The receiver 25 holds the state of the actuator 17, and the tail gate 22 continues to move up or down. The CONT
The frame is continuously input while the up switch 3 or the down switch 4 is operated. When the operation of the up switch 3 or the down switch 4 is completed, the receiver 2
5 receives the OFF frame, the receiver 25 stops outputting the load drive signal LD1, and the tail gate 22
Stops rising or falling.

By the way, as shown in FIG.
When the operation code signal F is interrupted while receiving the CONT frame, the receiver 25 stops the output of the control signal C2 and the output of the load drive signal LD1 by the relay circuit 16, so that the tail gate The ascent or descent of 22 stops.

When the operation code signal F of the receiver 25 is received again, the CPU 26 outputs a control signal C2 based on the function code F2 of the operation code signal F, and controls the driving of the relay circuit 16. . At this time, transmitter 2
3 transmits a plurality of ON frames, the function code F2
To the CONT frame instead of the ascending continuation code F2d or the descending continuation code F2e. Therefore, the receiver 25
Is input with a CONT frame.

Then, the CPU 26 determines whether the up continuation code F2d or the down continuation code F
2e, the state before the CONT frame is input is held. Before the CONT frame is input, the CPU 26 stops the output of the control signal C2 to the relay circuit 16 and stops the output of the load drive signal LD1 based on the interruption of the operation code signal F.
Is a state in which the ascent or descent has stopped. Therefore, the receiver 25 holds the tailgate 22 in a stopped state.
Therefore, when the operation code signal F is input again, for example, when the operator approaches the truck 21 while operating the up switch 3 or the down switch 4, the tail gate 22 is held in a stopped state, and is again stopped. It does not rise or fall.

When the operator once releases the up switch 3 or the down switch 4 and operates again, the transmitter 2
3 transmits the operation code signal F of the ON frame after transmitting the operation code signal F of the OFF frame. Then, the receiver 25 turns on after inputting the OFF frame.
Since the frame is input, the drive of the actuator 17 is controlled based on the ON frame, the drive of the hydraulic motor is controlled, and the tail gate 22 is raised or lowered.

The timer 26c is used to operate the receiver 25 intermittently. That is, the CPU 26
6c, the control signal C1 is output to the intermittent control circuit 15 for a fixed time at fixed intervals, and the RF reception circuit 13
Operation of intermittently supplying the power P to the power supply.

The timer 26c is used to stop the receiving operation of the receiver 25. That is, the CPU 26 of the receiver 25 determines, based on the value of the timer 26c, whether the operation code signal F has not been input for a certain period of time after the start of the receiving operation or whether an ON frame has not been input for a certain period of time. . Then, the CPU 26 continues the reception operation when the fixed time has not elapsed, and automatically switches from the continuous operation to the intermittent operation after the fixed time has elapsed. With this configuration, the power consumption of the vehicle-mounted battery 10 is reduced by the intermittent operation of the RF receiving circuit 16.

Next, the operation of the remote control device configured as described above will be described with reference to FIGS. First, the operation of the transmitter 23 will be described with reference to FIG.

The CPU 24 of the transmitter 23 is activated when the power switch 2 is operated, and executes steps (hereinafter simply referred to as S) 1 to S14 of the transmission program shown in FIG.

First, in S1, the CPU 24 performs an initial setting process. This initial setting processing includes setting of a flag value necessary for the operation of the transmission program, setting of the timer 24c, and the like. The flag value is used to determine whether the frame transmitted when the up switch 3 or the down switch 4 is operated is transmitting an ON frame or an OFF frame. This flag value is stored in the RAM 24b. Upon ending the initialization processing, the CPU 24 proceeds from S1 to S2.

In S2, the CPU 24 sets the fixed code portion F of the operation code signal
A is transmitted via the RF transmission circuit 6 and the antenna 8.
When the transmission of the fixed code part FA is completed, the CPU 24
Move from S2 to S3.

In S3, the CPU 24 determines whether or not the up switch 3 (or the down switch 4) as an operation switch is operated. When the up switch 3 (or the down switch 4) is not operated, C
The PU 24 proceeds from S3 to S4.

In S4, the CPU 24 sets the flag value to "0" and stores the set flag value in the RAM 24b.
To be stored. Further, S5 is a stop code setting process (stop code setting means).
2 is set to the stop code F2c. Then, when the setting is completed, the CPU 24 proceeds from S5 to S6.

In S6, the CPU 24 determines whether the function code F2 in which the stop code F2c is set and the identification code F1 are set.
From this, the value of the error correction code F3 is calculated. And C
The PU 24 outputs the function code F2 of the operation code signal F.
And an operation code section FB including an error correction code F3 via the RF transmission circuit 6 and the antenna 8. The operation code part FB transmitted in S6 and S2
The one-frame operation code signal F (OFF frame) is transmitted by the fixed code part FA transmitted in step (1). Then, the CPU 24 operates the operation code unit F
When the transmission of B is completed, the process moves from S6 to S7.

In S7, the CPU 24 sets the timer
Based on the value of c, it is determined whether a predetermined time has elapsed since the operation of the power switch 2 or a predetermined time has elapsed from the end of the operation of the up switch 3 (or the down switch 4). Then, if the predetermined time has not elapsed, the CPU 24 proceeds to S2.
And the transmission operation is continued. Therefore, S2 including S5
To S7 are repeatedly executed, and the operation code signal F of one frame is transmitted each time one loop is executed.

On the other hand, if the predetermined time has elapsed in S7, the CPU 24 enters the standby state and stops the transmission operation. The power consumption of the CPU 24 in the standby state is smaller than the power consumption during the transmission operation.

On the other hand, when the up switch 3 (or the down switch 4) as the operation switch is operated in S3, the CPU 24 detects that the operation switch is operated, and proceeds from S3 to S8.

In S8, the CPU 24 sets the RAM 24
It is determined whether the flag value stored in b is “0”. The flag value is set to S4 when the operation switch is not operated.
Is set to "0". Therefore, S8 is
Only in the first loop in which the operation switch is operated, the next S9
And the processing of S10, and is not performed in the second and subsequent loops. Then, in the case of the first loop in which the operation switch is operated, the CPU 24 proceeds from S8 to S9.

In S9, the CPU 24 sets the flag value to “1”, and stores the set flag value in the RAM 24b.
To be stored. Further, in S10, the CPU 24 sets a preset constant to the count value. This constant is a number for repeatedly transmitting an ON frame when the up switch 3 or the down switch 4 is operated, and is set to “3” in the case of FIG. 6 of the present embodiment. When a constant is set to the count value, the CPU 24
Moves from S10 to S11.

S11 is an operation code setting process (operation code setting means), and the CPU 24 sets the ascending code F2a (or the descending code F2b) as the function code F2. When the setting is completed, the CPU 24 proceeds to S11
From S6 to S6, in which the CPU 24 determines the error correction code F from the function code F2 in which the ascending code F2a (or the descending code F2b) is set and the identification code F1.
The value of 3 is calculated. Then, the CPU 24 outputs the function code F2 and the error correction code F3 of the operation code signal F.
Is transmitted via the RF transmission circuit 6 and the antenna 8. The operation code part FB transmitted in S6 and the fixed code part FA previously transmitted in S2 make the one-frame operation code signal F
(ON frame) will be transmitted.

When the operation switch is continuously operated, the loop from S2 to S7 including S11 is repeatedly executed, and the operation code signal F of one frame is transmitted each time the loop is executed. At this time, the flag value is S9
Is set to "1". Therefore, when executing the second loop, the CPU 24 proceeds from S8 to S12 because the flag value is “1” in S8.

At S12, CPU 24 determines whether or not the count value is "0". In S10, since the number of ON frames to be transmitted is set in the count value, if the count value is not “0”, the CPU 24
It is determined that a predetermined number of ON frames have not been transmitted,
Move to S13.

In S13, the CPU 24 determines whether the RAM 2
The count value stored in 4b is subtracted by "1". Then, the CPU 24 sets the function code F2 to the ascending code F2a (or the descending code F2b) in step S11 to transmit the predetermined number of ON frames, and then proceeds to step S6.
In step (1), an operation code section FB including the function code F2 and the calculated error correction code F3 is transmitted.

On the other hand, if the count value is "0" in S12, the CPU 24 determines that a predetermined number of ON frames have been transmitted. That is, S8 to S10 and S1
Steps S2 and S13 constitute a transmission count measuring unit. Then, the process proceeds to S14.

S14 is a continuation code setting process (continuation code setting means).
The ascending continuation code F2d (or the descending continuation code F2e) is set in the function code F2 instead of (or the descending code F2b). When the setting is completed, the CPU 24 proceeds to S
Move from S14 to S6.

In S6, the CPU 24 calculates the value of the error correction code F3 from the function code F2 in which the ascending continuation code F2d (or the descending continuation code F2e) is set and the identification code F1. Then, the CPU 24 transmits the operation code portion FB including the function code F2 and the error correction code F3 of the operation code signal F via the RF transmission circuit 6 and the antenna 8. The operation code signal FB (CONT frame) of one frame is transmitted by the operation code part FB transmitted in S6 and the fixed code part FA transmitted in S2 previously.

When the operation switch is continuously operated, the loop from S2 to S7 including S14 is repeatedly executed, and the operation code signal F of one frame is transmitted each time the loop is executed. You. The loop from S2 to S7 including S14 is repeatedly executed until the operation of the operation switch is completed. That is, when the operation of the operation switches is completed, the CPU 24 determines in S3 that the up switch 3 and the down switch 4 are not operated,
In S4, the flag value is set to "0", and in S5, the function code F2 is set to the stop code F2c. Then, in S6, the CPU 24 sets the function code F2 in which the stop code F2c is set and the calculated error correction code F2.
3 is transmitted.

Next, the operation of the receiver 25 will be described with reference to FIG. When receiving the operation code signal F from the transmitter 23, the CPU 26 of the receiver 25 repeatedly executes the loop from S21 to S26 of the reception program shown in FIG.

That is, in S 21, the CPU 26 sequentially inputs the operation code signal F transmitted from the transmitter 23 to the antenna 14 and the RF receiving circuit 13 as the operation code signal F. When the CPU 26 receives the operation code signal F for one frame, the process proceeds from S21 to S22.

At S22, CPU determines whether or not operation code signal F is normal. The error correction code F3 is used for this determination. That is, the CPU 26 checks based on the error correction code F3 whether the bits constituting the identification code F1 of the fixed code part FA and the function code F2 of the operation code part FB have an error. If there is no error, the CPU 26 proceeds from S22 to S23.

In S23, the CPU 26 determines whether or not the received operation code signal F for one frame is an ON frame. Specifically, the CPU 26 determines whether the function code F2 included in the operation code signal F is an ascending code F2a or a descending code F2b. OF in S21
When the operation code signal F of the F frame is received, it is determined that the function code F2 is not the ascending code F2a or the descending code F2b, and the CPU 26 proceeds from S23 to S24.

In S24, the CPU 26 determines whether or not the received operation code signal F for one frame is a CONT frame. Specifically, the CPU 26 determines that the function code F2 included in the operation code signal F is the rising continuation code F2.
It is determined whether d is the descent continuation code F2e or not. Here, since the OFF frame has been received, the function code F2 is the ascending continuation code F2d and the descending continuation code F2e.
Then, the CPU 26 proceeds from S24 to S25.

S25 is a load stop process (load stop means), and the CPU 26 stops the load. Specifically, C
The PU 26 stops outputting the control signal C2 to the relay circuit 16. Since the control signal C2 is not input to the relay circuit 16, the output of the load drive signal LD1 to the actuator 17 is stopped, and the rise or fall of the tail gate 22 is stopped.

That is, the receiver 25 controls the load to be off in S25, that is, controls the actuator 17 to be off to stop the tailgate 22. When the load is controlled to be off, the CPU 26 proceeds from S25 to S2.
Move to 1.

When the operation code signal F of the ON frame is received in S21, the CPU 26 determines in S23 that the function code F2 included in the operation code signal F is the ascending code F2a or the descending code F2b. Is an ON frame. And
The CPU 26 proceeds from S23 to S26.

S26 is a load driving process (load driving means), and the CPU 26 drives the load. Specifically, C
PU 26 outputs control signal C2 to relay circuit 16. Upon input of the control signal C2, the relay circuit 16 outputs a load drive signal LD1 to the actuator 17, and the drive of the actuator 17 is controlled based on the load drive signal LD1, and the tailgate 22 moves up or down.

That is, in S25, the receiver 25 controls the load to be turned on, that is, controls the actuator 17 to be turned on to move the tail gate 22 up or down. Then, the CPU 26 proceeds from S26 to S21.

When the operation code signal F of the CONT frame is received in S21, the CPU 26 determines in S24 that the operation code F2 included in the operation code signal F is the up continuation code F2d or the down continuation code F2e. It is determined that the signal F is a CONT frame. Then, the CPU 26 proceeds from S24 to S21.

That is, when the operation code signal F of the CONT frame is received, the CPU 26 does not execute the load stop processing of S25 and the load drive processing of S26. Therefore, the load, that is, the state of the actuator 17 is CON
The state before the reception of the T frame is maintained, and the state is maintained. Therefore, when receiving the CONT frame, the CPU 26 executes a state holding process for holding the state of the load.

When the operation code signal F is interrupted, the CPU
26 determines in S22 that the operation code signal F is not normal, and proceeds from S22 to S25. And CP
U26 executes a load stop process in S25. As a result, the output of the load drive signal LD1 is stopped, and the rise or fall of the tail gate 22 is stopped.

Next, when the operation code signal F is received again, the transmitter 23 transmits the operation code signal F instead of the ON frame instead of the CONT frame.
Receives the CONT frame. Then, in S22, the CPU 26 determines that the operation code signal F is normal, and proceeds from S22 to S23. Then, since the operation code signal F is a CONT frame, the CPU 26
In S24, it is determined that the frame is a CONT frame, and S2
Move to 1.

That is, the CPU 26 does not execute the load driving process or the load stop process. At this time, the load, that is, the actuator 17 is controlled to be off based on a load stop process executed when the signal is interrupted. Therefore, when the operation code signal F is received again, the actuator 1
7, the operation is held and remains off, so that the tail gate 22 does not move up or down.

Then, the operator confirms that the tail gate 22 has not been raised or lowered, and operates the lift switch 3 or the lower switch 4 of the transmitter 23 again.
At 5, the ON frame is received after the OFF frame. Then, the CPU 26 controls the actuator 17 to be turned on by receiving the ON frame, and the tail gate 22 moves up or down based on the actuator 17.

As described above, in the present embodiment,
The following effects are obtained. (1) The transmitter 23 transmits an operation code signal F including a function code F2 in which an ascending code F2a or a descending code F2b is set, based on the operation of the ascending switch 3 or the descending switch 4. When the up switch 3 or the down switch 4 is continuously operated, the up code F2d or the down code F2e is set as the function code F2 instead of the up code F2a or the down code F2b. Is transmitted.

The receiver 25 controls the drive of the actuator 17 to control the tailgate when the ascending code F2a or the descending code F2b is set in the function code F2 based on the function code F2 included in the operation code signal F. 22 is raised or lowered. In addition, when the up continuation code F2d or the down continuation code F2e is set in the function code F2, the receiver 25 holds the state before receiving the operation code signal F including the function code F2.
Then, when the operation code signal F is interrupted, the drive of the actuator 17 is controlled to stop the raising or lowering of the tailgate 22. Therefore, when the interrupted operation code signal F is received again, the function code F2 included in the operation code signal F is set to the ascending continuation code F2d or the descending continuation code F2e. , Ie, the state in which the tailgate 22 is stopped. As a result, the tailgate 22 is held in a stopped state until the operator operates the operation switch again, so that an unintended operation of the operator can be prevented.

The present invention may be carried out as follows in addition to the above embodiment. (1) In the above embodiment, the ascending continuation code F2d instead of the ascending code F2a and the descending continuation code F2e instead of the descending code F2b are set, but only one continuation code is set, and the ascending or descending switches 3, 4 are set. Is operated, the operation code signal F including the same continuation code may be transmitted instead of the ascending code F2a or the descending code F2b.

(2) In the above embodiment, the number of times the ON frame is repeatedly transmitted is set to “3”.
The number may be set to any number of “2” or “3” or more. (3) In the above-described embodiment, the transmission count measuring means is configured by subtracting the count value. However, the count value is added to count up, and in S12, it is determined whether or not the count value matches a predetermined value. The transmission number measurement means may be configured by using this method.

(4) In the above embodiment, the track 21
Although the present invention is embodied in a remote control device for raising or lowering the tailgate 22 provided at the rear end of the luggage compartment, it may be embodied in a remote control device for operating a crane or the like.

While the embodiments of the present invention have been described above, technical ideas other than the claims that can be grasped from the above embodiments will be described below together with their effects. (B) The transmitter is provided with a power switch, and starts a transmission operation of transmitting the transmission signal based on an operation of the power switch, and after a lapse of a predetermined time from the start of the transmission operation, or 6. The remote control device according to claim 1, wherein the transmission operation is stopped after a predetermined time has elapsed from the end of the operation of the operation switch. According to this configuration, power consumption while the transmission operation is stopped is reduced.

[0109]

As described above in detail, according to the present invention, it is possible to provide a remote control device capable of preventing unintended operation when received radio waves are interrupted.

[Brief description of the drawings]

FIG. 1 is a block diagram of a remote control device according to an embodiment.

FIG. 2 is an explanatory diagram showing a configuration of one frame of a transmission signal according to one embodiment.

FIG. 3 is an explanatory diagram showing types of function codes according to the embodiment;

FIG. 4 is a waveform chart showing the operation of the remote control device.

FIG. 5 is a waveform chart showing an operation when transmission is interrupted.

FIG. 6 is a processing flowchart of a transmitter.

FIG. 7 is a processing flowchart of a receiver.

FIG. 8 is a schematic side view of a truck with a tailgate lifter.

FIG. 9 is a block diagram of a conventional remote control device.

FIG. 10 is an explanatory diagram showing a configuration of one frame of a transmission signal.

FIG. 11 is an explanatory diagram showing types of conventional function codes.

FIG. 12 is a waveform diagram of a conventional remote control device.

[Explanation of symbols]

3 up switch as operation switch, 4 down switch as operation switch, 17 actuator as load, 23 transmitter, 24 operation code setting means,
CPU as code changing means, stop code setting means, and transmission count measuring means, 25 ... receiver, 26 ... CP as load driving means, load stopping means, and state holding means
U, LD1: load drive signal, F: operation code signal, F2
... function code, F2a ... ascending code as operation code, F2b ... descending code as operation code, F2c ...
Stop code, F2d: ascending continuation code as continuation code, F2e, descending continuation code as continuation code

Claims (5)

[Claims] A transmitter for transmitting, as a transmission signal, an operation code signal including a function code based on operation of an operation switch on a carrier wave by a transmission circuit; demodulating the operation code signal from the transmission signal by a reception circuit; A receiver that outputs a load drive signal based on a function code included in the operation code signal. The transmitter includes an operation code when the operation switch is operated. And an operation code setting means for setting a continuation code as a function code instead of the operation code when the operation switch is continuously operated. A load driving unit that outputs the load driving signal when the operation code is set in the function code; and the transmission signal Load stopping means for stopping the output of the load driving signal when reception is stopped, and state holding means for holding the state of the load at the time when the continuation code is set in the function code. Remote control device. 2. The transmitter further includes a stop code setting unit that sets a stop code in the function code when an operation switch is not operated, and the load stop unit included in the receiver includes: 2. The remote control device according to claim 1, wherein the output of the load drive signal is stopped when the transmission signal is no longer received or when a stop code is set in the function code. 3. The transmitter according to claim 1, further comprising: a transmission frequency measurement unit configured to measure a transmission frequency of a transmission signal including a function code having an operation code set by the operation code setting unit. 3. The remote control device according to claim 1, wherein the continuation code is set as a function code when a transmission signal is transmitted a predetermined number of times based on a measurement result of the transmission number measurement unit. 4. 4. The transmitter according to claim 1, wherein the transmitter includes a plurality of operation switches, and the operation code setting unit sets operation codes corresponding to the plurality of operation switches to the function codes. A remote control device according to item 1. 5. The remote control device according to claim 4, wherein said code changing means sets a continuation code corresponding to each of said plurality of operation switches to a function code instead of said operation code.