JP2013230715A - Washing device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing device for a vehicle capable of washing a vehicle window and an on-vehicle camera by sharing an electric pump and a tank and capable of reducing power consumption.SOLUTION: A washing device for a vehicle includes an electromagnetic changeover valve B to which voltage is applied only while a reverse signal L indicating that the vehicle is in a reverse state is output and which switches a flow passage of washing liquid from an electric pump 20 from a rear washer nozzle N1 side to a camera washer nozzle N2 side. The washing device further includes a pressure reduction control section 31 applying changeover voltage to the electromagnetic changeover valve B for only a first time set in advance on the basis of an input of the reverse signal L and applying changeover state holding voltage lower than the changeover voltage instead of the changeover voltage while the reverse signal L is continuously input after the lapse of the first time.

Description

  The present invention relates to a vehicle cleaning device.

  2. Description of the Related Art Conventionally, as a vehicle cleaning device, there is a vehicle cleaning device that alternatively supplies a cleaning liquid to either a window cleaning nozzle or a camera cleaning nozzle using a single electric pump (see, for example, Patent Document 1). In this vehicle washing apparatus, a switching valve is communicated with an electric pump, and a window washing nozzle and a camera washing nozzle are communicated with the switching valve, and any one of them is operated by an operation of a switching valve based on an operation of a switch provided in a driver's seat. Alternatively, the cleaning liquid can be fed, and the cleaning liquid can be selectively sprayed onto either the vehicle window or the imaging surface of the in-vehicle camera. In such a vehicle cleaning apparatus, for example, the vehicle window and the in-vehicle camera can be cleaned using an electric pump and a tank in common.

  By the way, as a switching valve, there exists an electromagnetic switching valve apparatus which switches a flow path only while the voltage is applied (for example, refer patent document 2). That is, this electromagnetic switching valve device includes an exciting coil, drives the valve with electromagnetic force generated when the exciting coil is energized, and switches the flow path with the valve only while the exciting coil is energized.

JP 2004-182080 A Japanese Utility Model Publication No. 61-85781

  However, in the vehicular cleaning device using the electromagnetic switching valve device as described above, a high voltage continues to be applied to the electromagnetic switching valve device even after switching, particularly when the flow path is switched for a long time. There is a problem that it increases.

  The present invention has been made to solve the above-mentioned problems, and its object is to clean the vehicle window and the in-vehicle camera while sharing the electric pump and the tank, and to reduce the power consumption. An object of the present invention is to provide a vehicular cleaning apparatus capable of performing

  The invention according to claim 1 is a vehicle cleaning apparatus including a camera cleaning nozzle for injecting a cleaning liquid toward an imaging surface of an in-vehicle camera disposed at a rear portion of the vehicle, and a command signal from a washer switch And an electric pump that feeds a cleaning liquid stored in a tank to a window cleaning nozzle for injecting the cleaning liquid stored in the tank, and a main pipe that connects between the electric pump and the window cleaning nozzle. A voltage is provided only while a reverse signal is output that is provided at a branch pipe connecting the main pipe and the camera cleaning nozzle, and at a branch portion of the main pipe and the branch pipe and indicating that the vehicle is in a reverse drive state. Is applied to switch the flow path of the cleaning liquid from the electric pump from the window cleaning nozzle side to the camera cleaning nozzle side, and the rear Based on the input of the signal, a switching voltage is applied to the electromagnetic switching valve device for a preset first time, and after the first time has elapsed and the reverse signal is continuously input, A gist is provided with a valve control unit that applies a switching state holding voltage lower than the switching voltage instead of the switching voltage.

  According to this configuration, a voltage is applied to the electromagnetic switching valve device while the reverse signal indicating that the vehicle is in the reverse state is being output, and the flow path of the cleaning liquid from the electric pump is viewed from the wind cleaning nozzle side to the camera. Since it is switched to the cleaning nozzle side, for example, the vehicle window and the in-vehicle camera can be cleaned using an electric pump and a tank in common. As a result, for example, the installation space can be reduced and the cost can be reduced.

  Further, based on the input of the reverse signal, the switching voltage is applied to the electromagnetic switching valve device for a preset first time, and after the first time has elapsed, the reverse signal is continuously input. Since the switching state holding voltage lower than the switching voltage is applied instead of the switching voltage, useless power consumption can be suppressed. That is, the electromagnetic switching valve device requires a high switching voltage when switching the flow path, and can maintain the flow path state with a low switching state holding voltage after switching. The power consumption can be reduced compared to the case where the voltage switching voltage is continuously applied.

  According to a second aspect of the present invention, in the vehicular cleaning apparatus according to the first aspect, the valve control unit applies the switching state holding voltage to the electromagnetic switching valve device by reducing the switching voltage. The gist is that it is a control unit.

  According to this configuration, the valve control unit is a pressure reduction control unit that applies the switching state holding voltage to the electromagnetic switching valve device by reducing the switching voltage. It can be a system. Therefore, for example, compared to the case where different power supply wirings for switching voltage and switching state holding voltage are connected in parallel to the electromagnetic switching valve device and each voltage is applied independently, the length of the power supply wiring to be used It is possible to shorten the length.

  According to a third aspect of the present invention, in the vehicle cleaning device according to the second aspect, the pressure reduction control unit includes a voltage dividing resistor connected to a ground side terminal of the electromagnetic switching valve device, and the voltage dividing resistor. A first switching element connected between a ground and being turned on while the reverse signal is input; a second switching element connected between a ground-side terminal of the electromagnetic switching valve device and the ground; The present invention includes a timer that outputs a timer signal for turning on the second switching element for the first time when the reverse signal is input.

  According to this configuration, while the reverse signal is input, the first switching element is turned on and the ground-side terminal of the electromagnetic switching valve device is connected to the ground via the voltage dividing resistor. When a reverse signal is input, a timer signal for turning on the second switching element for the first time is output from the timer, and the ground side terminal of the electromagnetic switching valve device is directly connected to the ground (via the second switching element). Connected). Therefore, until the first time elapses, a current flows without going through the voltage dividing resistor, and a high switching voltage is applied to the electromagnetic switching valve device. In addition, after the first time has elapsed and the reverse signal is continuously input, the second switching element is turned off, so that a current flows through the voltage dividing resistor and the electromagnetic switching valve device has A low voltage switching state holding voltage is applied. In this case, since the ground side terminal of the electromagnetic switching valve device is already connected to the ground via the voltage dividing resistor before the second switching element is turned off, the switching state holding voltage is changed from the switching voltage. When switching to, it can be avoided that a voltage is not instantaneously applied to the electromagnetic switching valve device, and the switching state can be maintained satisfactorily. That is, in a circuit configuration in which the second switching element is turned off and the ground side terminal of the electromagnetic switching valve device is connected to the ground via a voltage dividing resistor, the electromagnetic switching is performed when the switching voltage is switched to the switching state holding voltage. There is a possibility that no voltage is instantaneously applied to the valve device, and there is a possibility that the switching state cannot be maintained at that time, but this can be prevented.

  According to a fourth aspect of the present invention, there is provided the vehicle cleaning apparatus according to any one of the first to third aspects, wherein the switching operation by the electromagnetic switching valve device is performed while the electric pump is stopped. The gist is that a control unit is provided.

  According to this configuration, since the switching operation by the electromagnetic switching valve device is performed by the pump control unit while the electric pump is stopped, the electromagnetic pressure can be quickly generated in a state where the pressure in the pipe is sufficiently low (load is small). Switching operation by the switching valve device can be performed. Thereby, for example, the electric power for driving the electromagnetic switching valve device can be reduced, and the switching response is improved. Further, since the electric pump is not driven when the switching operation by the electromagnetic switching valve device is performed, for example, unintentional injection of the cleaning liquid into the vehicle window can be avoided.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to wash | clean a vehicle window and a vehicle-mounted camera by sharing an electric pump and a tank, the washing | cleaning apparatus for vehicles which can achieve low power consumption can be provided.

1 is a schematic configuration diagram of a vehicle including a vehicle cleaning device according to an embodiment. The electric circuit diagram for demonstrating the electrical constitution of the washing | cleaning apparatus for vehicles of one Embodiment. The time chart of each signal and operation | movement of the washing | cleaning apparatus for vehicles of one Embodiment.

Hereinafter, an embodiment of a vehicle cleaning apparatus of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vehicle 1 is provided with a shift lever 3 of the transmission 2 next to the driver's seat, and the vehicle 1 shifts by operating the shift lever 3 to each position (each position). When the shift lever 3 is operated to the first speed position, the transmission 2 shifts the speed ratio of the vehicle 1 to the first speed. When the shift lever 3 is operated to the second speed position, the transmission 2 shifts the gear ratio of the vehicle 1 to the second speed. When the shift lever 3 is operated to the neutral position, the transmission 2 shifts the speed ratio of the vehicle 1 to neutral.

  Further, when the shift lever 3 is operated to the reverse position (reverse position), the transmission 2 causes the vehicle 1 to move backward (reverse drive is possible). At this time, the back lamp BL provided at the rear portion of the vehicle 1 is lit while the shift lever 3 is being shifted to the reverse position (reverse position).

The console panel of the vehicle 1 is provided with a display device DSP used for displaying the current position and other maps in the navigation device.
A rear wiper device 6 is provided at the rear center position of the vehicle 1 and below the rear window 4 as a vehicle window. The rear wiper device 6 rotates when the rear wiper motor M <b> 1 is driven, and the wiper blade 7 of the rear wiper device 6 wipes the outer surface of the rear window 4.

  A rear washer nozzle N1 as a wind cleaning nozzle is provided at the rear center position of the vehicle 1 and above the rear window 4. The rear washer nozzle N <b> 1 has a nozzle port directed toward the lower rear window 4, and the cleaning liquid is sprayed onto the wiping surface of the rear window 4 from the nozzle port.

  The rear washer nozzle N <b> 1 is connected to a washer pump P provided in the front engine room of the vehicle 1 via a main pipe 8. The washer pump P is a pump for feeding the cleaning liquid stored in a tank T provided in the engine room to the rear washer nozzle N1 via the main pipe 8. When the washer switch SW1 provided in the driver's seat is operated, the washer pump P is driven by the drive of the pump motor M2 (see FIG. 2) to wash the cleaning liquid from the tank T through the main pipe 8 and the rear washer nozzle. It is designed to feed N1. In the present embodiment, the washer pump P and the pump motor M2 constitute the electric pump 20.

  A vehicle-mounted camera 10 for back monitoring is installed outside the rear portion of the vehicle 1 and further in the rear position than the rear wiper device 6 in the present embodiment. In the present embodiment, the in-vehicle camera 10 is a rear view camera for rearward viewing, and an image captured by the in-vehicle camera 10 is output to the display device DSP as image data. The display device DSP displays an image captured by the in-vehicle camera 10 on the screen based on the image data.

  When the shift lever 3 of the transmission 2 is operated to the reverse position (reverse position), the in-vehicle camera 10 starts an imaging operation and outputs the image data to the display device DSP. In addition, when the shift lever 3 is shifted from the reverse position (reverse position) to any other position, the vehicle-mounted camera 10 ends the imaging operation.

  A camera washer nozzle N2 as a camera cleaning nozzle is provided at a position adjacent to the in-vehicle camera 10 and deviating from the rear imaging viewing angle of the in-vehicle camera 10. The camera washer nozzle N2 is directed toward the glass window 10a as an imaging surface provided to protect the lens of the in-vehicle camera 10 from mud, dust, dust, etc. 10 glass windows 10a are jetted.

  The camera washer nozzle N2 is connected to a branch pipe 8a branched from the main pipe 8 that connects the washer pump P and the rear washer nozzle N1. The branch pipe 8 a is connected to the main pipe 8 at the rear part of the vehicle 1, and the pipe up to the connection position (branch part) at the rear part is used in common with the main pipe 8. An electromagnetic switching valve B as an electromagnetic switching valve device is provided at a branch portion where the branch piping 8a branches from the main piping 8. The electromagnetic switching valve B is a valve that switches the flow path of the cleaning liquid from the washer pump P from the rear washer nozzle N1 side to the camera washer nozzle N2 side while a voltage is applied (energized).

  The electromagnetic switching valve B is driven by applying a voltage (energized) at a later-described timing based on the shift lever 3 of the transmission 2 being operated to the reverse position (reverse position), and the branch pipe 8a and the main pipe. 8 is connected. That is, the electromagnetic switching valve B cuts off the connection between the rear washer nozzle N1 and the washer pump P and connects the camera washer nozzle N2 and the washer pump P. Accordingly, the camera / washer nozzle N2 is in a state where the washing liquid from the tank T can be fed by the washer pump P.

  When the washer switch SW1 is operated from this state, the washer pump P is driven to feed the cleaning liquid from the tank T to the camera / washer nozzle N2 via the main pipe 8 and the branch pipe 8a. Then, the cleaning liquid is jetted to the glass window 10a of the in-vehicle camera 10 from the nozzle opening of the camera washer nozzle N2.

  On the other hand, when the shift lever 3 of the transmission 2 is operated to a position other than the reverse position (reverse position), the electromagnetic switching valve B is not applied (energized) and is not driven. When the electromagnetic switching valve B is in a non-driven state, the connection between the branch pipe 8a and the main pipe 8 is cut off, and the rear washer nozzle N1 and the washer pump P are connected via the main pipe 8. Therefore, at the normal time, the rear washer nozzle N1 is in a state in which the cleaning liquid from the tank T can be fed by the washer pump P.

  When the washer switch SW1 is operated from this state, the washer pump P is driven and the cleaning liquid from the tank T is fed to the rear washer nozzle N1 via the main pipe 8. Then, the cleaning liquid is sprayed to the rear window 4 from the nozzle opening of the rear washer nozzle N1.

Next, the electrical configuration of the vehicle cleaning apparatus configured as described above will be described with reference to FIG.
In FIG. 2, the back lamp BL provided at the rear part of the vehicle 1 is connected in series with the back lamp relay 11 provided at one end to the ground and the other end via the lamp harness L <b> 1 in the engine room at the front part of the vehicle 1. It is connected.
(Back lamp relay 11)
The back lamp relay 11 is a reed relay having a reed switch 11a and an exciting coil 11b. The reed switch 11a has a positive terminal connected to the positive power supply line L0 connected to the battery positive terminal via the fuse F1, and a negative terminal connected to the back lamp BL via the lamp harness L1. . The reed switch 11a is turned on when the exciting coil 11b is energized and excited, supplies current to the back lamp BL, and turns on the back lamp BL. The lamp harness L1 is connected to a pressure reduction control unit 31 as a valve control unit disposed at the rear of the vehicle 1, and the pressure reduction control unit 31 (at the same time as the back lamp BL is turned on). A reverse signal L indicating that the vehicle is in a reverse drive state (a state in which the vehicle can move backward) is input.

One end of the exciting coil 11 b of the back lamp relay 11 is connected to the positive terminal side of the reed switch 11 a, and the other end is connected to the position detection sensor 12.
(Position detection sensor 12)
The position detection sensor 12 is a sensor that detects the reverse position (reverse position) of the shift lever 3 of the transmission 2. The position detection sensor 12 includes a detection unit 12a including a detection element in which the shift lever 3 is located at the reverse position (reverse position), and an open / close switch 12b including a switching transistor that is turned on / off in response to a detection signal from the detection unit 12a. It consists of and.

  When the shift lever 3 is in the reverse position, the detection unit 12a outputs a detection signal for turning on (closing) the open / close switch 12b to the open / close switch 12b. When the shift lever 3 is at a position other than the reverse drive position, the detection unit 12a loses the detection signal and turns off (opens) the open / close switch 12b.

  The open / close switch 12b has one end connected to the exciting coil 11b of the back lamp relay 11 and the other end grounded. The opening / closing switch 12b is turned on to energize the exciting coil 11b when the detecting unit 12a detects that the shift lever 3 is in the reverse position. In other words, the reed switch 11a is turned on, current is supplied to the back lamp BL via the lamp harness L1, and the back lamp BL is turned on, and the reverse signal L indicating that the vehicle is in the reverse drive state is output to the decompression control unit 31. Let

On the other hand, the open / close switch 12b is turned off to de-energize the exciting coil 11b when the detecting unit 12a detects that the shift lever 3 is in a position other than the reverse position. That is, the reed switch 11a is turned off to interrupt the current to the lamp harness L1 so that the back lamp BL does not light up.
(Decompression controller 31)
Based on the input of the reverse signal L, the pressure reduction control unit 31 applies the switching voltage V1 (see FIG. 3) to the electromagnetic switching valve B for a preset first time t1 (see FIG. 3), While the reverse signal L is continuously input after the elapse of time t1, the switching state holding voltage V2 (see FIG. 3) lower than the switching voltage V1 is applied instead of the switching voltage V1. .

  Specifically, the pressure reduction control unit 31 applies the switching state holding voltage V2 to the electromagnetic switching valve B by reducing the switching voltage V1, and includes a voltage dividing resistor R1 and an NPN transistor as the first switching element. Tr1, an NPN transistor Tr2 as a second switching element, and a timer TM are provided.

  One end of the voltage dividing resistor R1 is connected to the ground side terminal of the exciting coil C in the electromagnetic switching valve B described later, and the other end is grounded (connected to the ground) via the transistor Tr1. The transistor Tr1 is turned on while the lamp harness L1 is connected to its base terminal via a resistor R2 and the reverse signal L (H level signal) is being input.

The ground side terminal of the exciting coil C in the electromagnetic switching valve B is grounded (connected to the ground) via the transistor Tr2. The transistor Tr2 is turned on while the lamp harness L1 is connected to its base terminal via the resistor R3 and the timer TM and the timer signal TK (H level signal) from the timer TM is being input. When the backward signal L (H level signal) is input, the timer TM outputs the timer signal TK (H level signal) for the first time t1 (see FIG. 3), and the elapse of the first time t1. Even if the reverse signal L is continuously input later, the output of the timer signal TK is stopped (the L level signal is output).
(Rear wiper motor M1)
One end of a rear wiper motor M1 that drives the rear wiper device 6 is connected to a rear wiper switch 15, and a + B terminal of the rear wiper switch 15 is connected to a positive power line L0 via a fuse F2 provided in a front engine room of the vehicle 1. It is connected to the. On the other hand, the other end of the rear wiper motor M1 is grounded.

The rear wiper motor M1 includes an automatic fixed position stop device for the rear wiper device 6 (the wiper blade 7 is moved to the home position even if the rear wiper switch 15 is set to “OFF” when the wiper blade 7 is not in the home position). The cam switch 14 that constitutes a device that stops the operation is incorporated.
(Cam switch 14)
The cam switch 14 has an a contact 14a, a b contact 14b, a common contact 14c, and a movable contact 14d. The a contact 14a is connected to the motor harness L2 and connected to the positive power supply line L0 via the fuse F2. The b contact 14b is connected to the other end of the rear wiper motor M1 and grounded. The movable contact 14d is connected to a common contact 14c, one end of which is connected to the S terminal of the rear wiper switch 15, and moves with the rotation of the rear wiper motor M1. The movable contact 14d is movable so that the other end is connected to either the a contact 14a or the b contact 14b.

  More specifically, when the wiper blade 7 is in a position other than the home position, the movable contact 14d is connected to the a contact 14a. Therefore, the rear wiper motor M1 is maintained in power supply from the positive power supply line L0 via the cam switch 14 even when the rear wiper switch 15 is “OFF”.

When the wiper blade 7 is located at the home position, the movable contact 14d is disconnected from the a contact 14a and connected to the b contact 14b. As a result, both ends of the rear wiper motor M1 are closed and grounded, and power generation braking is applied and stopped.
(Rear wiper switch 15)
The rear wiper switch 15 is a switch for driving the rear wiper motor M1, and is operated “ON” or “OFF” by the driver. The rear wiper switch 15 has a + B terminal, an S terminal, and a +1 terminal.

  The +1 terminal is connected to one end (positive electrode side) of the rear wiper motor M1. The S terminal is connected to the common contact 14 c of the cam switch 14. The + B terminal is connected to the motor harness L2, is connected to the positive power supply line L0 via the fuse F2, and is connected to the a contact 14a of the cam switch 14.

  The rear wiper switch 15 is operated from “OFF” to “ON” by the driver when the rear wiper motor M1 is desired to be driven (when the rear wiper device 6 is desired to be driven). That is, the rear wiper motor M1 is driven by causing the current from the power supply line L0 to flow through the + B terminal, the +1 terminal of the rear wiper switch 15, and the rear wiper motor M1 regardless of the state of the cam switch 14.

Further, when the rear wiper motor M1 is desired to be stopped (when the rear wiper device 6 is desired to be stopped), the rear wiper switch 15 is operated from “ON” to “OFF”. Then, the rear wiper motor M1 is supplied with power depending on the cam switch 14. That is, as described above, when the wiper blade 7 is in a position other than the home position, the power supply is maintained from the positive power line L0 via the cam switch 14, and when the wiper blade 7 moves to the home position, the power supply is cut off and stopped. The
(Pump motor M2)
One end of the pump motor M2 for driving the washer pump P is connected to the power supply line L0 via the fuse F2, and the other end is grounded via the transistor Tr3. The base terminal of the transistor Tr3 is connected to the washer switch SW1 via a resistor R4. When the washer switch SW1 is operated, a command signal (washer signal W) is input. Therefore, when the washer switch SW1 is operated and the washer signal W (H level signal) is input to the base terminal of the transistor Tr3, the pump motor M2 is driven by the power supplied from the power supply line L0 and isted. The pump P is driven. As a result, the cleaning liquid from the tank T is fed to the main pipe 8.

That is, the pump motor M2 and the washer pump P constitute the electric pump 20, and the electric pump 20 is driven based on the washer signal W from the washer switch SW1 to feed the cleaning liquid from the tank T to the main pipe 8.
(Electromagnetic switching valve B)
The electromagnetic switching valve B has an introduction port P0 for introducing the cleaning liquid from the main pipe 8 upstream from the electromagnetic switching valve B. The electromagnetic switching valve B is downstream of the electromagnetic switching valve B, and is downstream of the electromagnetic switching valve B and a first outlet port P1 for leading the cleaning liquid to the main pipe 8 connected to the rear washer nozzle N1. The branch pipe 8a connected to the camera / washer nozzle N2 has a second outlet port P2 for leading the cleaning liquid.

  The electromagnetic switching valve B drives the valve SB provided in the valve body so that the introduction port P0 is electrically connected to one of the first derivation port P1 and the second derivation port P2. Is to be blocked.

The valve SB is driven and controlled by an exciting coil C provided in the electromagnetic switching valve B.
When the exciting coil C is not energized (in the initial state), the valve SB communicates the introduction port P0 and the first derivation port P1 and keeps the introduction port P0 and the second derivation port P2 in a disconnected state. . On the other hand, when the exciting coil C is energized (while energized), the valve SB operates to connect the introduction port P0 and the second derivation port P2, and the introduction port P0 and the first derivation port P1. Is kept shut off.

  The exciting coil C of the electromagnetic switching valve B has a high potential side terminal connected to a motor harness L2 (power supply line for supplying power to the rear wiper motor M1) to the cam switch 14 of the rear wiper motor M1 at the rear portion of the vehicle 1. Thus, it is connected to the positive power supply line L0 via the fuse F2, and the ground side terminal is connected to the decompression control unit 31 as described above. As a result, while the reverse signal L is input to the decompression control unit 31, the transistor Tr1 is turned on and the ground side terminal of the exciting coil C is grounded via the voltage dividing resistor R1. When the reverse signal L is input to the decompression control unit 31, the transistor Tr2 is turned on only for the first time t1 (see FIG. 3), and the ground side terminal of the exciting coil C is directly grounded (via the transistor Tr2). The Therefore, until the first time t1 elapses, a current flows without going through the voltage dividing resistor R1, and the high voltage switching voltage V1 (see “applied voltage” in FIG. 3) is applied to the exciting coil C. As a result, a sufficient electromagnetic force for driving the valve SB to switch the flow path is generated, and the valve SB operates to bring the introduction port P0 and the second outlet port P2 into communication. Here, the first time t1 is set in advance to a time at which the switching operation of the electromagnetic switching valve B is sufficiently completed. Further, while the reverse signal L is continuously input after the first time t1 has elapsed, the transistor Tr2 is turned off, so that a current flows through the voltage dividing resistor R1 and the excitation coil C is supplied to the exciting coil C. A low voltage switching state holding voltage V2 (see “applied voltage” in FIG. 3) is applied. As a result, an electromagnetic force for holding the valve SB is generated, the valve SB is held, and the introduction port P0 and the second outlet port P2 are maintained in communication with each other.

Here, the operation | movement and effect | action of the washing | cleaning apparatus for vehicles of this embodiment are demonstrated.
For example, as shown in FIG. 3, when the reverse signal L is set to the H level (when the shift lever 3 is set to the reverse position), the timer signal TK is set to the H level only for the first time t1, during which the transistor Tr2 Is turned on and a high voltage switching voltage V1 is applied to the electromagnetic switching valve B. Thereby, the electromagnetic switching valve B (excitation coil C) is energized, and the introduction port P0 (main pipe 8) and the second outlet port P2 (branch pipe 8a) communicate with each other. That is, the flow path of the cleaning liquid from the electric pump 20 is switched to the camera / washer nozzle N2 side.

  Further, the transistor Tr1 is turned on while the reverse signal L is at the H level (the shift lever 3 is at the reverse position). Then, while the reverse signal L is at the H level after the elapse of the first time t1, the transistor Tr2 is turned off, so that the low voltage switching state holding voltage V2 is applied to the electromagnetic switching valve B. Applied. Thereby, the state where the introduction port P0 (main pipe 8) and the second outlet port P2 (branch pipe 8a) communicate with each other is maintained. That is, the flow path of the cleaning liquid from the electric pump 20 remains switched to the camera / washer nozzle N2 side.

  When the washer signal W becomes H level in this state (the washer switch SW1 is turned on), the electric pump 20 is driven, and the cleaning liquid is sprayed from the camera / washer nozzle N2 to the glass window 10a of the in-vehicle camera 10 ( In FIG. 3, "camera washer injection") is performed, and mud, dust, dust, and the like attached to the glass window 10a are removed.

  Further, when the reverse signal L is set to the L level (when the shift lever 3 is set to a position other than the reverse position), the transistor Tr1 is turned off and the electromagnetic switching valve B (excitation coil C) is deenergized. The port P0 (main pipe 8) and the second lead-out port P2 (branch pipe 8a) are blocked, and the introduction port P0 and the first lead-out port P1 are communicated. That is, the flow path of the cleaning liquid from the electric pump 20 is returned to the rear washer nozzle N1 side.

  In this state, when the washer signal W becomes H level (the washer switch SW1 is turned on), the electric pump 20 is driven, and the cleaning liquid is jetted from the rear washer nozzle N1 to the rear window 4 (in FIG. 3, “Wiper washer spray”).

Next, the characteristic effects of the above embodiment will be described below.
(1) While the reverse signal L indicating that the vehicle 1 is in the reverse drive state is being output, a voltage is applied to the electromagnetic switching valve B so that the flow path of the cleaning liquid from the electric pump 20 is on the rear washer nozzle N1 side. To the camera / washer nozzle N2 side. Therefore, for example, the rear window 4 and the glass window 10a of the in-vehicle camera 10 can be cleaned using the electric pump 20 (washer pump P and pump motor M2) and the tank T in common. As a result, for example, the installation space can be reduced and the cost can be reduced.

  Further, based on the input of the reverse signal L, the switching voltage V1 is applied to the electromagnetic switching valve B for a preset first time t1, and the reverse signal L is continuously input after the elapse of the first time t1. During this time, the switching state holding voltage V2, which is lower than the switching voltage V1, is applied instead of the switching voltage V1, so that useless power consumption can be suppressed. That is, the electromagnetic switching valve B requires a high switching voltage V1 when switching the flow path, and can maintain the flow path state with the low switching state holding voltage V2 after switching. The power consumption can be reduced compared to the case where the high switching voltage V1 is continuously applied. Further, heat generation of the electromagnetic switching valve B (excitation coil C) can be suppressed as compared with the case where the high switching voltage V1 is continuously applied even after switching. As a result, for example, the electromagnetic switching valve B to be employed can be reduced in size and cost.

  (2) As described above, the valve control unit that applies the switching voltage V1 and the switching state holding voltage V2 to the electromagnetic switching valve B applies the switching state holding voltage V2 to the electromagnetic switching valve B by reducing the switching voltage V1. Since the pressure reduction control unit 31 is used, the power supply wiring from the power supply (battery) to the electromagnetic switching valve B can be integrated. Therefore, for example, compared to the case where different power supply wirings for the switching voltage and the switching state holding voltage are connected in parallel to the electromagnetic switching valve B and each voltage is applied independently, the length of the power supply wiring to be used is longer It is possible to shorten the length.

  (3) In the pressure reduction control unit 31, while the reverse signal L is input, the transistor Tr1 is turned on, and the ground side terminal of the electromagnetic switching valve B is connected to the ground via the voltage dividing resistor R1. When the reverse signal L is input, the timer TM outputs a timer signal TK for turning on the transistor Tr2 for the first time t1, and the ground side terminal of the electromagnetic switching valve B is directly connected to the ground (via the transistor Tr2). Connected). Therefore, until the first time t1 elapses, a current flows without passing through the voltage dividing resistor R1, and the high-voltage switching voltage V1 is applied to the electromagnetic switching valve B. In addition, after the first time t1 has elapsed and the reverse signal L is continuously input, the transistor Tr2 is turned off, so that a current flows through the voltage dividing resistor R1 to the electromagnetic switching valve B. Is applied with a low voltage switching state holding voltage V2. In this way, since the ground side terminal of the electromagnetic switching valve B is already connected to the ground via the voltage dividing resistor R1 before the transistor Tr2 is turned off, the switching state holding voltage V2 is changed from the switching voltage V1. When switching to, it is possible to avoid instantaneously no voltage being applied to the electromagnetic switching valve B, and it is possible to maintain the switching state satisfactorily. That is, in a circuit configuration in which the transistor Tr2 is turned off and the ground side terminal of the electromagnetic switching valve B is connected to the ground via the voltage dividing resistor R1, the electromagnetic voltage is switched when the switching voltage V1 is switched to the switching state holding voltage V2. There is a possibility that a voltage may not be instantaneously applied to the switching valve B, and there is a possibility that the switching state cannot be maintained at that time, but this can be prevented.

  (4) Since a part of the power supply to the back lamp BL which is disposed at the rear part of the vehicle 1 and is turned on when the shift lever 3 is set to the reverse position is the reverse signal L, the rear part of the vehicle 1 from the shift lever 3 The signal line to the decompression control unit 31 can be significantly shortened (compared to a case where the signal line is provided in parallel with the lamp harness L1 to the back lamp BL).

The above embodiment may be modified as follows.
In the above embodiment, the circuit configuration is such that the switching operation by the electromagnetic switching valve B can be performed even when the electric pump 20 is driven, but the switching operation by the electromagnetic switching valve B is performed in a state where the electric pump 20 is stopped. It is good also as a circuit structure provided with the pump control part. For example, the pump control unit is a circuit that prohibits driving of the electric pump 20 during the first time t1, regardless of the washer signal W (regardless of whether the washer switch SW1 is turned on).

  In this case, since the switching operation by the electromagnetic switching valve B is performed in a state where the electric pump 20 is stopped, the switching by the electromagnetic switching valve B is quickly performed in a state where the pressure in the pipe is sufficiently low (load is small). The action can be performed. Thereby, for example, the electric power for driving the electromagnetic switching valve B can be reduced, and the switching response is improved. Moreover, since the electric pump 20 is not driven when the switching operation by the electromagnetic switching valve B is performed, for example, unintentional cleaning liquid injection (leakage) to the rear window 4 can be avoided.

  In the above embodiment, the valve control unit that applies the switching voltage V1 and the switching state holding voltage V2 to the electromagnetic switching valve B reduces the switching voltage V1 to apply the switching state holding voltage V2 to the electromagnetic switching valve B. The controller 31 is not limited to this, but the switching voltage V1 and the switching state holding voltage V2 may be applied to the electromagnetic switching valve B by other methods. For example, the electromagnetic switching valve B may be configured as a valve control unit in which different power supply wirings for switching voltage and switching state holding voltage are connected in parallel and each voltage is applied independently.

  In the above embodiment, the reverse signal L is a part of the power supply to the back lamp BL that is disposed at the rear of the vehicle 1 and lights when the shift lever 3 is in the reverse position. Instead, it may be a reverse signal of another system. For example, a signal detected when the vehicle 1 is actually moving backward (the tire is rotating in reverse) may be used as the reverse signal. For example, when the vehicle 1 is provided with an alarm buzzer indicating that the vehicle travels backward, when the shift lever 3 is operated to the reverse position, the alarm buzzer sounds and the current supplied to the alarm buzzer A part of may be used as a reverse signal.

  In the above embodiment, the electromagnetic switching valve B is connected to the power line (motor harness L2) that supplies power to the rear wiper motor M1 at the rear portion of the vehicle 1, but is not limited to this. It may be connected to a power supply line that supplies power to another device provided at the rear portion of 1 or may be connected to a power supply line at the front portion of the vehicle 1 (independently from other devices).

The technical idea that can be grasped from the above embodiment and other examples will be described below together with the effects thereof.
(A) In the vehicular cleaning apparatus according to any one of claims 1 to 4, the reverse signal is a back lamp that is disposed at the rear of the vehicle and lights when the shift lever is in the reverse position. The valve control unit is disposed at the rear of the vehicle, and a part of the supply power to the back lamp is input as the reverse signal. apparatus.

  According to this configuration, since a part of the power supply to the back lamp that is disposed at the rear of the vehicle and lights when the shift lever is in the reverse position is used as the reverse signal, from the shift lever to the valve control unit at the rear of the vehicle This signal line can be significantly shortened (compared with the case where the signal line is provided in parallel with the wiring to the back lamp).

  DESCRIPTION OF SYMBOLS 1 ... Vehicle, 4 ... Rear window (vehicle window), 8 ... Main piping, 8a ... Branch piping, 10 ... In-vehicle camera, 10a ... Glass window (imaging surface), 20 ... Electric pump, 31 ... Pressure reduction control part (valve control) Part), B ... electromagnetic switching valve (electromagnetic switching valve device), L ... reverse signal (signal indicating that the vehicle is in reverse), N1 ... rear washer nozzle (wind washing nozzle), N2 ... camera washer nozzle (Camera cleaning nozzle), R1 ... voltage dividing resistor, SW1 ... washer switch, T ... tank, t1 ... first time, TK ... timer signal, TM ... timer, Tr1 ... transistor (first switching element), Tr2 ... Transistor (second switching element), V1... Switching voltage, V2... Switching state holding voltage.

Claims (4)

A vehicle cleaning device including a camera cleaning nozzle for injecting a cleaning liquid toward an imaging surface of an in-vehicle camera disposed at the rear of the vehicle,
An electric pump that is driven based on a command signal from a washer switch and that feeds a cleaning liquid stored in a tank to a window cleaning nozzle for injecting the cleaning liquid into a vehicle window;
Branching from a main pipe connecting between the electric pump and the window cleaning nozzle, a branch pipe connecting the main pipe and the camera cleaning nozzle;
A voltage is applied only while a reverse signal indicating that the vehicle is in a reverse drive state is output, provided at a branch portion of the main pipe and the branch pipe, and the flow path of the cleaning liquid from the electric pump is applied. An electromagnetic switching valve device for switching from the window cleaning nozzle side to the camera cleaning nozzle side;
Based on the input of the reverse signal, a switching voltage is applied to the electromagnetic switching valve device for a preset first time, and the reverse signal is continuously input after the first time has elapsed. And a valve control unit for applying a switching state holding voltage lower than the switching voltage instead of the switching voltage. The vehicle cleaning device according to claim 1,
The said valve control part is a pressure reduction control part which applies the said switching state holding voltage to the said electromagnetic switching valve apparatus by reducing the said switching voltage, The washing | cleaning apparatus for vehicles characterized by the above-mentioned. The vehicle cleaning device according to claim 2,
The decompression control unit
A voltage dividing resistor connected to a ground side terminal of the electromagnetic switching valve device;
A first switching element connected between the voltage dividing resistor and the ground and turned on while the reverse signal is input;
A second switching element connected between the ground side terminal of the electromagnetic switching valve device and the ground;
And a timer for outputting a timer signal for turning on the second switching element for the first time when the reverse signal is input. The vehicle washing apparatus according to any one of claims 1 to 3,
A vehicle washing apparatus, comprising: a pump control unit that performs a switching operation by the electromagnetic switching valve device in a state where the electric pump is stopped.