JPH0589106U - Vehicle load control device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the average current consumption. [Structure] The power supply from the vehicle-mounted battery 11 to the high frequency unit 16 and the CPU 18 is intermittently performed via the transistor 13 that is turned on / off by the oscillator 14. The high frequency unit 16 generates a sensing signal Sa within a relatively short time to hold the transistor 13 in an ON state when receiving a radio wave signal in a power feeding state, and sends a signal Sd obtained by detecting the received radio wave signal to the CPU 18. give. CP
When the detection signal Sd includes a remote control signal, the U 18 controls the operation of the door lock mechanism 17 based on the remote control signal.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle load control device which, when receiving a remote control signal using an airborne signal such as radio waves or infrared rays, controls the operation of a vehicle load based on the remote control signal.

[0002]

[Prior Art]

 Conventionally, a system has been put into practical use in which a door lock mechanism for an automobile can be unlocked and locked by a radio wave signal for remote operation from a terminal device carried by a driver. In such a system, the radio signal includes a predetermined cryptographic code, and then the receiving circuit that receives the radio signal and the cryptographic code included in the received radio signal are decoded on the automobile side. In general, a load control device including a control circuit for controlling the operation of the door lock mechanism is provided.

FIG. 3 schematically shows an example of the electrical configuration of such a load control device. That is, in FIG. 3, the high frequency unit 2 as a receiving circuit, which is supplied with power from the vehicle-mounted battery 1 through the fuse 1a, is configured to be able to receive a radio signal from a portable transmitter (not shown) through the antenna 2a. .. The radio signal can transmit a first remote control signal for instructing unlocking of the vehicle door lock mechanism 3 and a second remote control signal for instructing locking. The signal is set to include a predetermined code. The power of the CPU 4 constituting the control circuit is supplied from the on-vehicle battery 1 through the fuse 1a and the pnp type transistor 5 constituting the switching circuit.

The high-frequency unit 2 is configured to output a sensing signal Sa that rises only during a reception period of a radio signal, and during the period when the sensing signal Sa is output, the transistor 5 passes through the NOR circuit 6. Turned on. Therefore, during the reception period of the radio wave signal, power is supplied to the CPU 4 through the transistor 5. Further, the high frequency unit 2 is configured to detect the received radio wave signal and give the detected signal Sd to the CPU 4.

The CPU 4 determines whether or not the detection signal Sd from the high frequency unit 3 includes the first and second remote control signals, and when the first remote control signal is included, Performs the unlocking operation of the door lock mechanism 3 through the driver 7, and when the second remote operation signal is included, performs the locking operation of the door lock mechanism 7 through the driver 7. The CPU 4 is configured to output the self-holding signal Sh until the control operation of the door lock mechanism 7 ends, and the self-holding signal Sh turns on the transistor 5 through the NOR circuit 6. Hold on.

[0006]

[Problems to be solved by the device]

 By the way, in recent years, in addition to the above load control devices, various types of electronic devices that consume electric power during parking have come to be mounted in automobiles in recent years to prevent so-called battery exhaustion. In the above, reducing the current consumption during parking is an important theme. However, in the conventional load control device described above, the power supply of the CPU 4 is started up only when a radio wave is received, but the power supply of the high frequency unit 2 is always turned on in order to keep it in the standby state. Since it is configured to be stored, there is a problem that the current consumption during parking is relatively large.

In order to deal with such a problem, conventionally, it has been considered to reduce the average current consumption by adopting a configuration in which the power supplies of the high frequency unit 2 and the CPU 4 are intermittently turned on. Specifically, as shown in FIG. 4, an oscillator 8 (which consumes very little power) for intermittently turning on the transistor 5 via the NOR circuit 6 is provided, and the high frequency unit is provided only when the transistor 5 is on. 2 and CPU 4 are configured to be supplied with power.

However, in such a configuration, during the ON period of the transistor 5 by the oscillator 8, that is, the periodic power-on period of the high-frequency unit 2 and the CPU 4, the waiting time until the CPU 4 becomes in a state where it can normally function. , And because it is necessary to secure the time required for the CPU 4 to judge the presence / absence of a remote control signal in the detection signal Sd (the remote control signal is a relatively long time series serial signal, which is relatively long), It was difficult to reduce the current consumption sufficiently, and as a result, the average current consumption could not be reduced sufficiently.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a vehicle load control device capable of sufficiently reducing the average current consumption.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a receiving circuit capable of receiving a remote control signal composed of an airborne signal, and a control circuit for controlling a vehicle load based on the remote control signal received by the receiving circuit. In the equipped vehicle load control device, a switching circuit is interposed between the power supply line for supplying power to the receiving circuit and the control circuit and the on-vehicle battery, and the switching circuit is intermittently turned on at a predetermined cycle. A circuit is provided, and the receiving circuit holds the switching circuit in the ON state when receiving the air propagation signal while being fed through the power supply line, and at the same time, a signal obtained by detecting the air propagation signal is sent to the control circuit. The control circuit is provided with the detection signal provided from the receiving circuit while being fed through the power supply line. Its in which control of the vehicle load based on a remote control signal is configured to retain only the switching circuit period until the end of the on state when that contained created signal.

Further, the first switching circuit is interposed between the first power supply line for supplying power to the receiving circuit and the vehicle-mounted battery, and the second power supply line for supplying power to the control circuit and the vehicle-mounted battery are provided. A second switching circuit is interposed between the power supply control circuit and the second switching circuit, and a power supply control circuit that intermittently turns on the first switching circuit at a predetermined cycle is provided. The first and second switching circuits are held in the ON state when the air propagation signal is received while being fed through the control circuit, and the control circuit is provided with a signal obtained by detecting the air propagation signal. When the detection signal provided from the receiving circuit includes the remote control signal while being supplied with power through the second power supply line, the vehicle load control based on the remote control signal. It is also possible to have a configuration in which at least the second switching circuit is held in the ON state only until the period ends.

[0012]

[Action]

 In the vehicle load control device according to claim 1, the switching circuit is intermittently turned on by the power supply control circuit, so that the receiving circuit and the control circuit are intermittently supplied from the vehicle battery through the power supply line. Power will be supplied. When receiving the air propagation signal in the power feeding state, the receiving circuit holds the switching circuit in the ON state and gives a signal obtained by detecting the received air propagation signal to the control circuit. If the detection signal given in the power supply state contains a remote control signal, the control circuit will switch the switching circuit only for the period until the control of the vehicle load based on the remote control signal is completed. The power supply is self-maintained by keeping it in the ON state.

In this case, the ON period of the switching circuit by the power supply control circuit, that is, the periodic power-on period of the receiving circuit and the control circuit is set to a relatively short period in which the receiving circuit responds to reception of the air propagation signal. As a result, the average current consumption can be reduced as a result of intermittent power supply to the receiving circuit and the control circuit.

According to another aspect of the vehicle load control device of the present invention, as the first switching circuit is intermittently turned on by the power supply control circuit, the power supply line from the vehicle-mounted battery is supplied to the reception circuit. Power will be supplied intermittently through. When receiving the aerial propagation signal in the power supply state, the receiving circuit holds the first and second switching circuits in the on state, and gives a signal obtained by detecting the received aerial propagation signal to the control circuit. The control circuit controls the vehicle load based on the remote control signal when the detection signal given in the power supply state according to the turning on of the second switching circuit includes the remote control signal. At least the second switching circuit is held in the ON state only for the period until the end, and thus the power supply is self-held.

Therefore, also in this case, the periodic power-on period of the receiving circuit can be shortened, and the power feeding operation to the control circuit is performed only at the timing when the receiving circuit receives the air propagation signal. Therefore, the average current consumption can be further reduced.

[0016]

【Example】

 Hereinafter, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 schematically shows an electric configuration of a load control device for an automobile only for a portion related to the gist of the present invention.

That is, in FIG. 1, a fuse 11 a and an emitter / collector of a pnp-type transistor 13 as a switching circuit are interposed in series between the vehicle-mounted battery 11 and the power supply line 12.

The oscillator 14 as a power supply control circuit is provided so as to be constantly energized from the vehicle-mounted battery 11 via the fuse 11 a, and is used to intermittently turn on the transistor 13 via the NOR circuit 15. It is configured to output the pulse signal Sp. The output cycle of the pulse signal Sp is set to, for example, 0.5 second or less, and the power consumption of the oscillator 14 is extremely small.

The high frequency unit 16 as a receiving circuit fed from the power supply line 12 is configured to receive a high frequency radio signal as an aerial radio signal transmitted from a portable transmitter (not shown) through the antenna 16a. ing. In this case, the radio signal transmitted from the portable transmitter includes a first remote control signal for instructing unlocking of the vehicle door lock mechanism 17 as a vehicle load and a second remote control signal for instructing locking. Operation signals can be transmitted, and each remote operation signal is set to include a predetermined serial encryption code.

When the radio frequency unit 16 receives a radio wave signal while being supplied with power through the power supply line 12, the high frequency unit 16 outputs a sensing signal Sa that rises only during the reception period of the radio wave signal and detects the received radio wave signal. In this configuration, the detection signal Sd is output. During the output period of the sensing signal Sa, the transistor 13 is held in the ON state via the NOR circuit 15, and the detection signal Sd is given to the CPU 18 as a control circuit.

The CPU 18 is connected so that power is supplied through the power supply line 12, and whether or not the detection signal Sd from the high frequency unit 16 includes the above-mentioned first and second remote control signals. If the first remote control signal is included, the unlocking operation of the door lock mechanism 17 is performed through the driver 19, and if the second remote control signal is included. Is configured to execute the locking operation of the door lock mechanism 17 through the driver 19. In this case, the CPU 18 is configured to output the self-holding signal Sh until the control operation of the door lock mechanism 17 is completed, and the self-holding signal Sh turns on the transistor 13 via the NOR circuit 15. In this state, the power supply is held by itself.

According to the configuration of the present embodiment described above, the sensing signal Sa from the high frequency unit 16 holds the transistor 13 in the ON state, so that the oscillator 14 turns on the transistor 13 (pulse (Determined by the pulse width of the signal Sp), that is, the periodic power-on period of the high-frequency unit 16 and the CPU 18 is longer than the time required to generate the sensing signal Sa after the high-frequency unit 16 assumes the receiving state. It ’s good. In this case, since it is possible to make the time required for the high frequency unit 16 to generate the sensing signal Sa after receiving the radio wave signal sufficiently short, the intermittent power supply time to the high frequency unit 16 and the CPU 18 is set as shown in FIG. Compared with the conventional configuration shown in Fig. 4, the average current consumption can be reduced, and even if the vehicle is parked for a long time, the consumption of the in-vehicle battery 11 is suppressed as much as possible. become able to.

FIG. 2 shows a second embodiment of the present invention. Hereinafter, only parts different from the first embodiment will be described.

That is, in FIG. 2, between the vehicle-mounted battery 11 and the first power supply line 20, the fuse 11 a and the emitter / collector of the pnp-type transistor 21 as the first switching circuit are interposed in series. Further, between the vehicle-mounted battery 11 and the second power supply line 22, a fuse 11a and an emitter / collector of a pnp-type transistor 23 as a second switching circuit are interposed in series. The high frequency unit 16 is connected so as to be supplied with power from the first power supply line 20, and the CPU 18 is connected so as to be supplied with power from the second power supply line 22.

The NOR circuit 24 provided to control the base of the transistor 21 receives the pulse signal Sp from the oscillator 14, the sensing signal Sa from the high frequency unit 16, and the self-holding signal Sh from the CPU 18. In this state, the transistor 21 is turned on. Further, the NOR circuit 25 provided to control the base of the transistor 23 turns on the transistor 23 in each state of receiving the sensing signal Sa from the high frequency unit 16 and the self-holding signal Sh from the CPU 18. ing.

According to this embodiment having such a configuration, the intermittent power feeding operation by the pulse signal Sp from the oscillator 14 is performed only to the high frequency unit 16, and the power feeding operation to the CPU 18 is performed to the high frequency unit. Since 16 is performed only at the timing when the radio signal is received, the average current consumption can be further reduced as compared with the first embodiment.

In each of the above-described embodiments, the remote control signal is composed of a radio wave signal, but other airborne signals such as infrared rays and ultrasonic waves may be used. Further, the vehicle load to be controlled is not limited to the door lock mechanism, and the load such as the engine starter circuit and the power window regulator can be controlled.

[0028]

[Effect of the device]

 As is clear from the above description, according to the vehicle load control device of claim 1, when the receiving circuit and the control circuit are periodically supplied with power through the switching circuit and the receiving circuit is in the receiving state. In addition, since the above switching circuit is kept in the ON state to secure the power supply, the average current consumption can be sufficiently reduced.

According to the vehicle load control device of the second aspect, the power feeding operation is performed only periodically to the receiving circuit, and the power feeding operation to the control circuit is performed by the receiving circuit. The average current consumption can be further reduced because it is performed only at the timing of receiving.

[Brief description of drawings]

FIG. 1 is an overall schematic circuit configuration diagram showing a first embodiment of the present invention.

FIG. 2 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.

FIG. 3 is a view corresponding to FIG. 1 showing a conventional example.

4 is a view corresponding to FIG. 1 showing a conventional example different from FIG.

[Explanation of symbols]

In the figure, 11 is an in-vehicle battery, 12 is a power supply line, 13 is a transistor (switching circuit), 14 is an oscillator (power supply control circuit), 16 is a high frequency unit (reception circuit), 1
7 is a door lock mechanism (vehicle load), 18 is a CPU (control circuit), 20 is a first power supply line, 21 is a transistor (first switching circuit), 22 is a second power supply line, and 23 is a transistor ( 2nd switching circuit) is shown.

Claims (2)

[Scope of utility model registration request] 1. A vehicle load control including a receiving circuit capable of receiving a remote control signal composed of an airborne signal, and a control circuit for controlling a vehicle load based on the remote control signal received by the receiving circuit. In the device, a switching circuit interposed between a power supply line for supplying power to the receiving circuit and the control circuit and an in-vehicle battery, and a power supply control circuit for intermittently turning on the switching circuit at a predetermined cycle are provided. The receiving circuit is configured to hold the switching circuit in an ON state when receiving an air propagation signal in a state of being fed through the power supply line, and to provide a signal obtained by detecting the air propagation signal to the control circuit. The control circuit is configured such that the remote operation signal is added to a detection signal provided from the receiving circuit in a state where power is supplied through the power supply line. In the case of being rare, the vehicle load control device is configured to hold the switching circuit in the ON state for a period until the control of the vehicle load based on the remote control signal is completed. . 2. A vehicle load control comprising a receiving circuit capable of receiving a remote control signal composed of an airborne signal, and a control circuit for controlling the vehicle load based on the remote control signal received by the receiving circuit. In the device, a first switching circuit interposed between a first power supply line for supplying power to the receiving circuit and a vehicle-mounted battery, a second power supply line for supplying power to the control circuit, and the vehicle-mounted battery And a power supply control circuit for intermittently turning on the first switching circuit in a predetermined cycle, and the receiving circuit supplies power through the first power supply line. And holding the first and second switching circuits in the ON state when receiving the airborne signal in the
The control circuit is configured to provide a signal obtained by detecting the airborne signal to the control circuit, and the control circuit includes a detection signal provided from the receiving circuit in a state of being fed through the second power supply line and the remote operation signal If included, it is configured to hold at least the second switching circuit in the ON state for a period until the control of the vehicle load based on the remote control signal ends. Vehicle load control device.