JPH061468Y2 - Vehicle constant-speed traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a constant speed traveling device for controlling opening / closing operation of a throttle valve in order to automatically maintain a traveling speed of a vehicle at a desired speed. The present invention relates to a vehicle constant-speed traveling device having a fail-safe function.

(Prior Art) Conventionally, in this type of device, a driver operates a set switch when a traveling vehicle speed reaches a desired value so that the vehicle speed at that time is set in a control electronic circuit. It has become. The actuator is controlled based on the operation of the control electronic circuit, and the opening of the throttle valve drivingly connected to the actuator is automatically adjusted to maintain the set vehicle speed. .
That is, the vehicle runs at a constant speed.
Here, this device is provided with a cancel function for immediately releasing the operation of the control electronic circuit to release the constant speed traveling by the driver operating the brake or the clutch during the constant speed traveling. . When the constant speed running is released, the throttle valve is returned to the fully closed position by a well-known return spring, or is opened and closed in conjunction with the driver's operation of the accelerator pedal. There is.

(Problems to be Solved by the Invention) However, in the conventional device, the control electronic circuit may be affected by disturbance such as electric noise or induction noise during its operation. Then, there is a possibility that the operation of the control electronic circuit may become abnormal when affected by the disturbance. For example, even if the driver operates the brake or the like to operate the cancel function during traveling at a constant speed, the control of the actuator is not released, and the input and output of the control electronic circuit may be inconsistent. For this reason, it is desired to immediately stop the abnormal operation of the control electronic circuit as described above.

(Purpose of Invention) This invention was made in view of the above-mentioned circumstances,
In particular, in order to immediately stop the abnormal operation during the execution of constant speed running, it was made paying attention to the fact that it is the most certain to cut off the power supply to the device. An object of the present invention is to provide a vehicle constant-speed traveling device that can reliably cut off supply.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, in the closed state of the main switch circuit, the circuit is opened to shut off the supply of the operating voltage to the constant speed traveling control means. Means and
In the unoperated state of the valve position detecting means for detecting the fully closed position arrangement state of the throttle valve, the constant speed traveling canceling means operated to cancel the operation of the constant speed traveling control means, and the valve opening means. When the operation of the constant speed traveling control means is canceled based on the operation of the constant speed traveling canceling means, the constant speed traveling control means is not detected when the fully closed position arrangement state of the throttle valve is not detected based on the operation of the valve position detecting means. And an abnormality determining means for activating the breaking means to open the main switch circuit.

(Operation) Therefore, during the operation of the device of the present invention, when the constant speed traveling control means is abnormally operated for some reason, the valve opening means is not opened in order to cancel the operation of the constant speed traveling control means. When the constant speed traveling release means is operated in the operated state and the throttle valve fully closed position arrangement state is not detected based on the operation of the valve position detecting means, the abnormality determining means determines that the constant speed traveling control means is abnormal. Then, the interruption means is operated. As a result, the main switch circuit is opened, and the supply of the operating voltage to the constant speed traveling canceling means is stopped.

(Embodiment) An embodiment in which the present invention is embodied in an automatic vehicle will be described in detail below with reference to FIG.

In the constant-speed traveling device of this embodiment, the constant-speed traveling setting is designated in the central processing unit (CPU) 1 as the constant-speed traveling control means for outputting the control signal for the constant-speed traveling of the vehicle. A control switch 2 that is operated to finely adjust the set vehicle speed is connected. or,
An actuator 3 as a throttle valve driving means is connected to the output side of the CPU 1, a control signal output from the CPU 1 is input to the actuator 3, and the actuator 3 is operated based on the control signal.

An engine (not shown) for adjusting the traveling speed of the vehicle
Is provided with a throttle valve 4. As is well known, the throttle valve 4 is always returned to the fully closed position by a return spring (not shown). The actuator 3 is drivingly connected to the throttle valve 4, and the actuator 3 operates to open / close the throttle valve 4.

Further, in the vicinity of the throttle valve 4, there is provided a throttle valve fully-closed switch 5 as a valve position detecting means for detecting a state of the valve 4 being in a fully closed position.

On the other hand, the main switch circuit 6 connected to supply the operating voltage to the CPU 1 is connected in series to an ignition switch 7 operated to start the engine.

To explain this main switch circuit 6 in detail,
The circuit 6 includes a relay switch 9 which is connected in series with the ignition switch 7 and which is opened / closed based on the operation of the relay coil 8. Further, one end of the relay coil 8 is connected to the output side of the AND circuit 10. The relay coil 8 is excited based on the output signal of the positive potential (hereinafter referred to as "H level") of the AND circuit 10 and demagnetized based on the output signal of the zero potential (hereinafter referred to as "L level"). The relay switch 9 is turned on (closed) based on the excitation of the relay coil 8, and the relay switch 9 is turned off (opened) based on the demagnetization of the coil 8. In this way, the relay coil 8 and the relay switch 9 constitute a breaking means for opening the main switch circuit 6 to stop the supply of the operating voltage to the CPU 1.

One end of a holding circuit 11 is connected to the input side of the AND circuit 10, and the other end of the holding circuit 11 is a main switch operated to close the main switch circuit 6 and supply the operating voltage of the CPU 1. 12 are connected. The main switch 1 is connected to the input side of the AND circuit 10.
An H level signal is input via the holding circuit 11 based on the ON operation of No. 2, and an L level signal is input via the holding circuit 11 based on the OFF operation of the main switch 12.

The output side of the NAND circuit 13 is connected to the input side of the AND circuit 10. Then, this NAND circuit 13
The throttle valve fully-closed switch 5 is connected to the input side of, and a brake switch 14 is connected as a constant-speed traveling canceling unit that operates in conjunction with a depression operation of a brake pedal (not shown). The brake switch 14 is used to release the control operation of the CPU1.
It is connected to the. Further, the NAND circuit 13 is connected to an input side thereof with an accelerator switch 15 which is operated in conjunction with an operation of an accelerator pedal 15a as a valve opening means which is operated to arbitrarily open the throttle valve 4. There is.

Then, on the input side of the NAND circuit 13, the brake switch 14 is turned off and an L level signal is input when the brake pedal is not operated, and when the brake pedal is depressed, the brake switch 14 is turned on and the H level is set. Signal is input. This H level signal is C
The control operation of the CPU 1 is also canceled based on the signal input to the PU 1.

Further, on the input side of the NAND circuit 13, when the throttle valve 4 is fully closed, the throttle valve fully-closed switch 5 is turned off to input an L level signal, and when the throttle valve 4 is not fully closed, the throttle valve fully closed. The close switch 5 is turned on, and an H level signal is input.

Further, to the input side of the NAND circuit 13, the accelerator switch 15 is turned off and an H level signal is input when the accelerator pedal is not operated, and when the accelerator pedal is depressed, the accelerator switch 15 is turned on and L is applied.
The level signal is input.

Then, the AND circuit 10 and the NAND circuit 13 constitute an abnormality determination circuit 16 as abnormality determination means,
When an abnormal situation occurs in which the throttle valve 4 is not located at the fully closed position when the brake pedal is depressed to release the control operation of the CPU 1 in the unoperated state of the accelerator pedal, the brake switch 14, the accelerator All the signals from the switch 15 and the throttle valve fully-closed switch 5 become H level. As a result, the output from the NAND circuit 13 becomes the L level, and even if the holding circuit 11 outputs the H level signal, the output from the AND circuit 10 becomes the L level, and the relay coil for turning off the relay switch 9 is operated. 8 is demagnetized. As a result,
The supply of operating voltage to the CPU 1 is cut off.

Therefore, in order to supply the operating voltage to this constant speed traveling device,
First, the ignition switch 7 is turned on, and the main switch 12 is activated when the brake pedal is not operated.
To turn on. At this time, AND is performed via the holding circuit 11.
The signal input to the circuit 10 becomes H level. Also, NA
Since the signal from the brake switch 14 input to the ND circuit 13 is L level, the signal output from the NAND circuit 13 to the AND circuit 10 is H level. As a result, the output signal from the AND circuit 10 becomes H level,
The relay coil 8 is excited and the relay switch 9 is turned on.

As a result, the operating voltage is supplied to the CPU 1, and the constant speed traveling can be set. That is, when the vehicle has reached a predetermined traveling speed in this state, if the constant speed traveling is set based on the operation of the control switch 2, the CPU 1
Outputs a control signal to the actuator 3, and the operation of the actuator 3 is controlled based on the control signal to automatically adjust the opening degree of the throttle valve 4. Therefore, the constant speed traveling of the vehicle is executed.

Further, when the brake pedal is depressed to release the control operation of the CPU 1 during execution of the constant speed traveling, the CPU 1 stops the output of the control signal to the actuator 3. As a result, the automatic adjustment of the opening / closing operation of the throttle valve 4 is released, and the throttle valve 4 is returned to the fully closed position by the return spring unless the accelerator pedal is depressed.

On the other hand, during execution of the constant speed running, the brake pedal is depressed to release the control operation of the CPU 1,
In addition, if the throttle valve 4 is not returned to the fully closed position even though the accelerator pedal is not operated, the CPU
It is determined based on the operation of the abnormality determining circuit 16 that 1 is abnormally operating for some reason. And CP
In order to cut off the supply of the operating voltage to U1, the relay coil 8 is demagnetized and the relay switch 9 is turned off. That is, in this case, the outputs from the brake switch 14, the accelerator switch 15, and the throttle valve fully closing switch 5 are all at the H level, so that the output from the NAND circuit 13 is at the L level and the output from the AND circuit 10 is at the L level. Relay coil 8 is demagnetized, relay switch 9
Is turned off.

As a result, the supply of the operating voltage to the CPU 1 is surely stopped, the CPU 1 is immediately stopped, and the actuator 3
The operation control of is released. As a result, the throttle valve 4
Is returned to the fully closed position by the return spring unless the accelerator pedal is depressed.

(Another embodiment) Next, another embodiment in which the present invention is embodied in an automatic vehicle will be described with reference to FIG. In this embodiment, the same members as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the main switch circuit 20 includes a normally open first relay switch 21 and a normally closed second relay switch 22 that are connected in series to the ignition switch 7.

The first relay switch 21 is excited and self-held on the basis of an ON operation of an automatic reset type main switch 23,
A first relay coil 24 for turning on the switch 21.
I have earned. Further, the first relay switch 21 is provided with a release switch 25 that is operated to release the excited state of the first relay coil 24 and turn off the first relay switch 21.

In addition, the second relay switch 22 has the switch 22
Relay coil 2 that is excited to turn off the power
6 is provided, and CPU 22 is provided by both of them 22 and 26.
A cutoff unit is configured to stop the supply of the operating voltage to the unit.

The abnormality judging circuit 27 constituting the abnormality judging means includes an AND circuit 28, and the output side of the AND circuit 28 is connected to the second relay coil 26 via a delay circuit 29 formed of a monostable multi-circuit. The delay circuit 29 is provided with a slight operation delay so that the second relay coil 26 does not perform an exciting operation even if the AND circuit 28 outputs an impulse output due to the influence of car noise or the like.

On the other hand, the accelerator switch 1 is provided on the input side of the AND circuit 28.
5 and the throttle valve fully-closed switch 5 are connected, and the output side of a flip-flop circuit (hereinafter referred to as “F / F circuit”) 30 is connected. This F / F circuit 3
A control switch 2 is connected to the set input side of 0, and a set signal is input based on the operation of the control switch 2. Further, on the reset input side of the F / F circuit 30, a parking brake switch 32 and a shift lever (not shown) that are turned on by interlocking with the brake switch 14 and the parking brake lever (not shown) via the OR circuit 31. A neutral switch 33 that is turned on in association with the neutral position arrangement is connected.
The output side of the OR circuit 31 is connected to the CPU 1 to release the control operation of the CPU 1.

Then, when the control switch 2 is operated to set the constant-speed running by the CPU 1, the set signal is input to the F / F circuit 30 and the output of the F / F circuit 30 becomes L level, and the output signal is It is continuously input to the AND circuit 28. Further, in order to release the constant speed traveling by the CPU 1, the switches 14, 3 are interlocked with the operation of the brake pedal, the parking brake lever and the shift lever.
By turning on 2 and 33, a reset signal is input from the OR circuit 31 to the F / F circuit 30, the output of the F / F circuit 30 becomes H level, and the same output signal is continuously input to the AND circuit 28. .

Further, in the H level output state of the F / F circuit 30, the accelerator switch 15 is turned off by the unoperated accelerator pedal, and the H level output signal from the switch 15 is input to the AND circuit 28. When the throttle valve 4 is not fully closed, the throttle valve fully closed switch 5
Is turned on, and the H level output signal from the switch 5 is input to the AND circuit 28.
The output of the ND circuit 28 becomes H level, and the same output signal is input to the second relay coil 26 via the delay circuit 29. As a result, the second relay coil 26 is excited, the second relay switch 22 is turned off, and the supply of the operating voltage to the CPU 1 is cut off.

Therefore, in order to supply the operating voltage to this constant speed traveling device,
First, when the ignition switch 7 is turned on and the main switch 23 is turned on while the brake pedal, the parking brake lever and the shift lever are not operated, the first relay coil 24 is excited and the first relay switch 21 is turned on. It This allows the CPU
The operating voltage is supplied to No. 1 so that the constant speed traveling can be set.

Further, when any one of the brake pedal, the parking brake lever and the shift lever is operated to release the control operation of the CPU 1 during execution of the constant speed traveling, the OR circuit 31 outputs a release signal to the CPU 1. It As a result, the CPU 1 stops outputting the control signal to the actuator 3. As a result, the automatic adjustment of the opening / closing operation of the throttle valve 4 is released, and the throttle valve 4 is returned to the fully closed position by the return spring unless the accelerator pedal is depressed.

On the other hand, when the constant-speed traveling is being executed, for example, the brake pedal is depressed to release the control operation of the CPU 1, and the throttle valve 4 is not returned to the fully closed position even though the accelerator pedal is not operated. On the basis of the operation of the abnormality determination circuit 27, it is determined that the CPU 1 is abnormally operating for some reason.
Then, in order to cut off the supply of the operating voltage to the CPU 1, the second relay coil 26 is demagnetized based on the operation of the abnormality determination circuit 27, and the second relay switch 22 is turned off.

That is, a reset signal is output from the OR circuit 31 to the F / F circuit 30 based on the ON operation of the brake switch 14, and an H level signal is output from the F / F circuit 30 to the AND circuit 28. Further, the outputs from the accelerator switch 15 and the throttle valve fully-closed switch 5 to the AND circuit 28 respectively become H level, the output from the AND circuit 28 becomes H level, the second relay coil 26 is excited, and the second relay switch 26 is excited. 22 is turned off.

As a result, the supply of the operating voltage to the CPU 1 is surely stopped, the CPU 1 is immediately stopped, and the actuator 3
The operation control of is released. As a result, the throttle valve 4
Is returned to the fully closed position by the return spring unless the accelerator pedal is depressed.

Further, in this embodiment, the brake switch 14, the parking brake switch 32, and the neutral switch 33.
Is connected to the F / F circuit 30 via the OR circuit 31, so that once the brake pedal or the like is operated in order to release the control operation of the CPU 1, the H / level output from the F / F circuit 30 is output. Is retained. Therefore, the apparatus of this embodiment can cope with the following abnormal operation of the CPU 1.

That is, for example, the driver senses an abnormal operation of the CPU 1 and depresses the brake pedal, and the abnormal operation of the CPU 1 is released based on this depressing operation. When the CPU 1 starts the abnormal operation again at the moment when is released, and the throttle valve 4 is fully opened via the actuator 3, that is, when an unexpected abnormal operation such as the CPU 1 once returned to the normal state occurs, Since the output of the F / F circuit 30 is maintained at the H level based on the first operation of the brake pedal, the output of the throttle valve fully closing switch 5 becomes the H level when the throttle valve 4 is fully opened again. . At this time, the output of the AND circuit 28 becomes H level, the second relay coil 26 is excited, and the second relay switch 22 is turned off. As a result, the supply of the operating voltage to the CPU 1 can be reliably stopped even when the above-mentioned unexpected abnormal operation occurs.

The invention is not limited to the above-described embodiments, and for example, a resume switch may be provided as a valve opening means other than the accelerator pedal, a special operation button may be provided as a constant speed traveling release means, or a vehicle other than an automatic vehicle may be provided. A part of the configuration can be appropriately changed and implemented such as being applied to a manual vehicle without departing from the spirit of the invention.

(Effect of the Invention) As described in detail above, according to the present invention, the supply of the operating voltage can be reliably cut off in the case of an abnormal operation, and the control operation for constant speed traveling can be immediately stopped. Shows excellent effects.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an embodiment embodying the present invention, and FIG. 2 is a block circuit diagram showing another embodiment embodying the present invention. 1 ... CPU as constant speed running control means, 3 ... Actuator as throttle valve driving means, 4 ... Throttle valve, 5 ... Throttle valve fully closing switch as valve position detecting means, 6, 20 ... Main switch circuit, 7 ... Ignition switch, 8 ... Relay coil, 9 ... Relay switch,
22 ... 2nd relay switch, 26 ... 2nd relay coil (8, 9 and 22, 26 comprise the interruption | blocking means),
12, 23 ... Main switch, 15a ... Accelerator pedal as valve opening means, 14 ... Brake switch, 32 ...
Parking brake switch, 33 ... Neutral switch (14, 32, and 33 each constitute constant-speed traveling canceling means).

Claims (1)

[Scope of utility model registration request] 1. A throttle valve (4) which is provided in an engine to open and close to adjust a traveling speed of a vehicle and is always opened and closed, and a throttle valve (4) which is opened and closed. The throttle valve driving means (3) is drivingly connected to the throttle valve (4) for operation, and is connected to an ignition switch (7) for starting an engine of the vehicle, and is operated to perform constant speed traveling of the vehicle. A main switch circuit (6, 20) equipped with a main switch (12, 23), and an operating voltage based on the closed circuit of the ignition switch (7) and the main switch circuit (6, 20) are supplied to drive at a constant speed. A constant speed traveling control means (1) for outputting a control signal to the throttle valve drive means (3), and an operation for arbitrarily opening the throttle valve (4). In the vehicle constant speed traveling device including a valve opening means (15a), the constant speed traveling control means (1) is opened by opening the main switch circuit (6, 20) in the closed state. ), The shutoff means (8,
9) (22, 26), a valve position detecting means (5) for detecting the fully closed position arrangement state of the throttle valve (4), and the constant speed traveling control means (1) release the operation at the time of operation. Constant-speed traveling canceling means (14, 32,
33) and when the operation of the constant speed traveling control means (1) is canceled based on the operation of the constant speed traveling canceling means (14, 32, 33) in the unoperated state of the valve opening means (15a). A throttle valve (4) based on the operation of the valve position detection means (5)
When the state of fully closed position is not detected, it is judged that the constant speed traveling control means (1) is abnormal, and the breaking means (8, 8) is provided to open the main switch circuit (6, 20).
9) Abnormality determination means (16, 22) for operating (22, 26)
27) and a constant speed traveling device for a vehicle, wherein