JP6809264B2 - Wiper device - Google Patents

Description

The present invention relates to a wiper device.

In recent wiper devices, a command signal from a wiper switch is transmitted to the control circuit of the wiper device by a communication line using LIN (Local Interconnect Network) as the communication protocol, but the wiper is separate from the communication line. A wiper switch signal line that conveys the on or off state of the switch to the control circuit is provided, and the wiper blade is based on a command signal transmitted on the communication line and a signal indicating the state of the wiper switch transmitted on the wiper switch signal line. The wiping operation is performed by.

Patent Document 1 compares the information obtained via the communication line with the information obtained via the wiper switch signal line, and despite the change in the information acquired via the communication line, the wiper switch signal. The invention of a wiper control device that determines that the input system of a wiper switch is abnormal when the information obtained via a wire does not change is disclosed.

Japanese Patent No. 5081036

However, the wiper control device described in Patent Document 1 verifies the state of the wiper switch signal line based on the change in the information obtained via the communication line. Therefore, when the wiper switch is not operated, the wiper switch signal line is verified. There was a problem that the abnormality of was not detected.

The present invention has been made in view of the above, and an object of the present invention is to provide a wiper device that accurately detects an abnormality in a wiper switch signal line.

In order to solve the above problems, the wiper device according to claim 1 has a wiper switch for inputting a command signal for changing the wiping speed of the wiper blade and a first signal path for transmitting the command signal from the wiper switch. And the state signal indicating the state of the wiper switch is connected to the wiper switch via each of the second signal paths to which the state signal is transmitted, and the command signal is the command signal when the combination of the command signal and the state signal is a predetermined combination. the controls the rotation of the wiper motor for wiping the wiper blade based, immediately after the ignition switch is turned on, the command signal indicates oFF, and the second when the state signal indicates oN It includes a control unit that determines that the signal path is abnormal.

According to this wiper device, the wiper switch signal is determined by determining the state of the second signal path based on the combination of the command signal transmitted from the first signal path and the state signal transmitted from the second signal path. It is possible to accurately detect an abnormality in the second signal path, which is a line.

The wiper device according to claim 2 includes, in the wiper device according to claim 1, a state display unit for displaying the state of the wiper device and a state display control unit for controlling the state display unit. The display control unit causes the status display unit to display the determination result by the control unit.

According to this wiper device, when an abnormality in the second signal path, which is a wiper switch signal line, is detected, the information can be notified to the user.

It is the schematic which shows the structure of the wiper device which concerns on embodiment of this invention. It is a block diagram which shows the outline of an example of the structure of the wiper device which concerns on embodiment of this invention. It is explanatory drawing which contrasted the wiper switch state which shows the mode selection position of the wiper switch of the wiper device which concerns on embodiment of this invention, the signal state of the communication line by LIN protocol, and the signal state of a wiper switch signal line. FIG. 3 is an explanatory diagram comparing a wiper switch state showing a mode selection position of a wiper switch of a wiper device of another aspect, a signal state of a communication line by the LIN protocol, and a signal state of a wiper switch signal line. It is a flowchart which showed an example of the process of confirming the state of the communication line and the wiper switch signal line of the wiper device which concerns on embodiment of this invention.

FIG. 1 is a schematic view showing the configuration of the wiper device 10 according to the present embodiment. The wiper device 10 is for wiping the windshield glass 12 provided in a vehicle such as a passenger car, and includes a pair of wipers 14 and 16, a wiper motor 18, and a link mechanism 20.

The wipers 14 and 16 are composed of wiper arms 24 and 26 and wiper blades 28 and 30, respectively. The base ends of the wiper arms 24 and 26 are fixed to the pivot shafts 42 and 44, which will be described later, and the wiper blades 28 and 30 are fixed to the tips of the wiper arms 24 and 26, respectively.

In the wipers 14 and 16, the wiper blades 28 and 30 reciprocate on the windshield glass 12 with the operation of the wiper arms 24 and 26, and the wiper blades 28 and 30 wipe the windshield glass 12.

The wiper motor 18 has an output shaft 32 capable of forward and reverse rotation via a reduction mechanism 52 mainly composed of a worm gear. The link mechanism 20 includes a crank arm 34, a first link rod 36, a pair of pivot levers 38 and 40, a pair of pivot shafts 42 and 44, and a second link rod 46.

One end side of the crank arm 34 is fixed to the output shaft 32, and the other end side of the crank arm 34 is operably connected to one end side of the first link rod 36. Further, the other end side of the first link rod 36 is operably connected to a position near the end different from the end having the pivot shaft 42 of the pivot lever 38, and is connected to the end having the pivot shaft 42 of the pivot lever 38. Both ends of the second link rod 46 are operably connected to different ends and to the ends of the pivot lever 40 corresponding to the ends of the pivot lever 38.

Further, the pivot shafts 42 and 44 are operably supported by a pivot holder (not shown) provided on the vehicle body, and the ends of the pivot levers 38 and 40 having the pivot shafts 42 and 44 are via the pivot shafts 42 and 44. The wiper arms 24 and 26 are fixed respectively.

In the wiper device 10 according to the present embodiment, when the output shaft 32 is rotated forward and reverse at a rotation angle θ1 in a predetermined range, the rotational force of the output shaft 32 is transmitted to the wiper arms 24 and 26 via the link mechanism 20. Then, along with the reciprocating operation of the wiper arms 24 and 26, the wiper blades 28 and 30 reciprocate between the lower reversing position P2 and the upper reversing position P1 on the windshield glass 12. The value of θ1 can take various values depending on the configuration of the link mechanism of the wiper device 10, but in the present embodiment, it is 140 ° as an example.

In the wiper device 10 according to the present embodiment, as shown in FIG. 1, when the wiper blades 28 and 30 are located at the storage position P3, the crank arm 34 and the first link rod 36 are linear. It is said to be a crank structure.

The storage position P3 is provided below the downward inversion position P2. The wiper blades 28 and 30 operate at the retracted position P3 by rotating the output shaft 32 by θ2 from the state where the wiper blades 28 and 30 are in the downward inversion position P2. The value of θ2 can take various values depending on the configuration of the link mechanism of the wiper device 10, but in the present embodiment, it is set to 10 ° as an example.

When θ2 is “0”, the downward inversion position P2 and the storage position P3 coincide with each other, and the wiper blades 28 and 30 stop at the downward inversion position P2 and are stored.

A wiper motor control circuit 22 for controlling the rotation of the wiper motor 18 is connected to the wiper motor 18. The wiper motor control circuit 22 according to the present embodiment includes a temperature detection circuit 90 for detecting the temperature of the circuit board and a microcomputer 58 based on a signal output from a thermistor provided on the circuit board of the wiper motor 18.

The microcomputer 58 of the wiper motor control circuit 22 controls the rotation speed of the wiper motor 18 based on the detection result of the rotation angle sensor 54 that detects the rotation speed and the rotation angle of the output shaft 32 of the wiper motor 18. The rotation angle sensor 54 is provided in the reduction mechanism 52 of the wiper motor 18, and converts the magnetic field (magnetic force) of the sensor magnet that rotates in conjunction with the output shaft 32 into an electric current for detection.

Since the wiper motor 18 according to the present embodiment has the reduction mechanism 52 as described above, the rotation speed and the rotation angle of the output shaft 32 are not the same as the rotation speed and the rotation angle of the wiper motor main body. However, in the present embodiment, the wiper motor main body and the reduction mechanism 52 are integrally inseparably configured. Therefore, hereinafter, the rotation speed and the rotation angle of the output shaft 32 are regarded as the rotation speed and the rotation angle of the wiper motor 18. ..

The microcomputer 58 can calculate the positions of the wiper blades 28 and 30 on the windshield glass 12 from the rotation angle of the output shaft 32 detected by the rotation angle sensor 54, and the rotation speed of the output shaft 32 changes according to the position. The drive circuit 56 is controlled so as to do so. The drive circuit 56 is a circuit that generates a voltage applied to the wiper motor 18 based on the control of the wiper motor control circuit 22, and switches the electric power of the vehicle battery as a power source to generate the voltage applied to the wiper motor 18.

Further, the wiper switch 50 is connected to the microcomputer 58 of the wiper motor control circuit 22 via a main ECU (Electronic Control Unit) 92 that controls the engine of the vehicle. The wiper switch 50 is a switch that turns on or off the electric power supplied from the vehicle battery to the wiper motor 18. The wiper switch 50 operates the wiper blades 28 and 30 at a low speed operation mode selection position (LOW), a high speed operation mode selection position (HIGH) for operating at a high speed, and an intermittent operation mode selection for intermittent operation at regular intervals. It is possible to switch between the position (INT) and the stop mode selection position (OFF). Further, a command signal for rotating the wiper motor 18 according to the selected position of each mode is output to the microcomputer 58 via the main ECU 92 and the signal input circuit 62. For example, the wiper switch 50 rotates the wiper motor 18 at high speed in the high-speed operation mode selection position, rotates the wiper motor 18 at low speed in the low-speed operation mode selection position, and intermittently rotates the wiper motor 18 in the intermittent operation mode selection position.

When the signal output from the wiper switch 50 according to the selected position of each mode is input to the microcomputer 58 via the main ECU 92 and the signal input circuit 62, the microcomputer 58 corresponds to the command signal from the wiper switch 50. Control to do. Specifically, the microcomputer 58 reads the rotation signal of the output shaft 32 and causes the wiper motor 18 to operate the wiper blades 28 and 30 at a desired reciprocating wiping cycle based on the command signal from the wiper switch 50. Control the applied voltage.

The meter ECU 94 that controls the instruments of the vehicle is connected to the main ECU 92, and the meter 96, which is the instruments of the vehicle, is connected to the meter ECU 94. For communication between the main ECU 92 and the signal input circuit 62, LIN is used as a protocol as an example.

The wiper switch 50 is connected to the signal input circuit 62 of the wiper motor control circuit 22 via the main ECU 92, and in addition to the communication lines 82A and 82B using LIN for the protocol, the wiper switch signal line 84 from the wiper switch 50 Is connected. The wiper switch signal line 84 inputs a signal (wiper switch signal) indicating a state (on or off state) of the wiper switch 50 to the signal input circuit 62. The microcomputer 58 controls the rotation of the wiper motor 18 based on the signals input via the communication lines 82A and 82B. The wiper switch signal line 84 is used for backing up the communication lines 82A and 82B, and when no signal is input to the microcomputer 58 via the communication lines 82A and 82B, the microcomputer 58 uses the wiper switch signal line 84. The rotation of the wiper motor 18 is controlled based on the signal input via the device. Further, the microcomputer 58 determines the suitability of the circuit related to the wiper switch 50 based on the signal input via the communication lines 82A and 82B and the signal input via the wiper switch signal line 84. The determination result of suitability of the circuit is transmitted to the main ECU 92 via the signal input circuit 62 and the communication lines 82A and 82B. The main ECU 92 causes the meter 96 to display the determination result via the meter ECU 94.

FIG. 2 is a block diagram showing an outline of an example of the configuration of the wiper device 10 according to the present embodiment. Further, the wiper motor 18 shown in FIG. 2 is, as an example, a DC motor with a brush.

The wiper device 10 shown in FIG. 2 is a wiper motor including a drive circuit 56 that generates a voltage applied to a winding terminal of the wiper motor 18 and a microcomputer 58 that controls on and off of switching elements constituting the drive circuit 56. It includes a control circuit 22. The electric power of the battery 80 is supplied to the microcomputer 58 via the diode 68, and the voltage of the supplied electric power is detected by the voltage detection circuit 60 provided between the diode 68 and the microcomputer 58. The detection result is output to the microcomputer 58. The microcomputer 58 controls the drive circuit 56 to generate a voltage applied to the winding of the wiper motor 18 when the voltage is equal to or more than a predetermined lower limit value and equal to or less than a predetermined upper limit value.

Further, an electrolytic capacitor C1 is provided in which one end is connected between the diode 68 and the microcomputer 58 and the other end (−) is grounded. The electrolytic capacitor C1 is a capacitor for stabilizing the power supply of the microcomputer 58. The electrolytic capacitor C1 protects the microcomputer 58 by storing a sudden high voltage such as a surge and discharging it to the ground region.

Further, the microcomputer 58 is connected to a current detection unit 76 that detects a current (motor current) flowing in the winding of the wiper motor 18 via a drive circuit 56. The current detection unit 76 amplifies the potential difference between both ends of the shunt resistor having a resistance value of about 0.2 mΩ to several Ω, and outputs a voltage value proportional to the current of the shunt resistor as a signal. The microcomputer 58 calculates the magnitude of the motor current based on the signal output by the current detection unit 76, and when the motor current exceeds a predetermined upper limit value, the circuit is short-circuited or the wiper motor 18 is overloaded. Judge that it is in a state.

A signal for instructing the rotation speed of the wiper motor 18 is input from the wiper switch 50 to the microcomputer 58 via the communication line 82A by the LIN protocol, the main ECU 92, the communication line 82B by the LIN protocol, and the signal input circuit 62, respectively. .. In addition to the communication lines 82A and 82B according to the LIN protocol, the signal input circuit 62 is connected to a wiper switch signal line 84 to which a signal indicating the state of the wiper switch is input from the wiper switch 50. The microcomputer 58 collates the state of the wiper switch 50 indicated by the signal acquired via the communication lines 82A and 82B by the LIN protocol with the state of the wiper switch 50 indicated by the signal acquired via the wiper switch signal line 84. , The abnormality of the circuit related to the wiper switch 50 is determined according to the combination of each state.

A rotation angle sensor 54 that detects the magnetic field of the sensor magnet 70 that changes according to the rotation of the output shaft 32 is connected to the microcomputer 58. The microcomputer 58 identifies the positions of the wiper blades 28 and 30 on the windshield glass 12 by calculating the rotation angle of the output shaft based on the signal output by the rotation angle sensor 54.

Further, the computer 58 refers to the rotation speed data of the wiper motor 18 defined according to the positions of the wiper blades 28 and 30 stored in the memory 48, and the rotation of the wiper motor 18 is specified by the wiper blade 28. , The drive circuit 56 is controlled so that the number of rotations corresponds to the position of 30.

As shown in FIG. 2, the drive circuit 56 uses N-type FETs (field effect transistors), Tr1, Tr2, Tr3, and Tr4, as switching elements. The drains of the transistor Tr1 and the transistor Tr2 are connected to the battery 80 via the noise prevention coil 66, and the sources are connected to the drains of the transistor Tr3 and the transistor Tr4, respectively. Further, the sources of the transistor Tr3 and the transistor Tr4 are grounded.

Further, the source of the transistor Tr1 and the drain of the transistor Tr3 are connected to one end of the winding of the wiper motor 18, and the source of the transistor Tr2 and the drain of the transistor Tr4 are connected to the other end of the winding of the wiper motor 18. ..

When a high level signal is input to each gate of the transistor Tr1 and the transistor Tr4, the transistor Tr1 and the transistor Tr4 are turned on, and the wiper motor 18, for example, the wiper blades 28 and 30 are clockwise when viewed from the passenger compartment side. The operating CW current 72 flows. Further, when one of the transistor Tr1 and the transistor Tr4 is on-controlled, the voltage of the CW current 72 can be modulated by turning the other on and off in small steps by PWM (Pulse Width Modulation) control.

Further, when a high level signal is input to each gate of the transistor Tr2 and the transistor Tr3, the transistor Tr2 and the transistor Tr3 are turned on, and the wiper motor 18, for example, the wiper blades 28 and 30 are seen from the passenger compartment side. A CCW current 74 that operates clockwise flows. Further, when one of the transistor Tr2 and the transistor Tr3 is on-controlled, the voltage of the CCW current 74 can be modulated by turning the other on and off in small steps by PWM control.

A voltage dividing circuit composed of a thermistor RT for temperature detection and a resistor R1 is mounted on the circuit board of the drive circuit 56. The thermistor RT is an element whose resistance value changes according to temperature. When the resistance value of the thermistor RT changes, the voltage divided by the voltage dividing circuit composed of the thermistor RT and the resistor R1 changes. In the microcomputer 58, the voltage divided by the voltage dividing circuit is converted into a digital signal that can be processed by the microcomputer 58 by the temperature detection circuit 90 and input to the microcomputer 58. The microcomputer 58 calculates the temperature of the circuit board on which the drive circuit 56 is mounted from the change in the voltage divided by the voltage divider circuit composed of the thermistor RT and the resistor R1. In the present embodiment, when the temperature detected by the thermistor RT is equal to or less than a predetermined upper limit value, the drive circuit 56 generates a voltage.

The thermistor RT may be provided at a location other than the circuit board on which the drive circuit 56 is mounted, as long as the temperature changes according to the load of the wiper motor 18 and the heat generation is remarkable. For example, if possible, it may be mounted inside the housing of the wiper motor 18.

In the present embodiment, a noise prevention coil 66 is provided between the battery 80, which is a power source, and the drive circuit 56, and an electrolytic capacitor C2 is provided so as to be in parallel with the drive circuit 56. The noise prevention coil 66 is an element for suppressing noise generated by switching of the drive circuit 56.

The electrolytic capacitor C2 alleviates noise generated from the drive circuit 56, stores a sudden high voltage such as a surge, and discharges it to the ground region to prevent an excessive current from being input to the drive circuit 56. It is an element for.

FIG. 3 compares the wiper switch state indicating the mode selection position of the wiper switch 50 of the wiper device 10 according to the present embodiment, the signal states of the communication lines 82A and 82B according to the LIN protocol, and the signal states of the wiper switch signal line 84. It is an explanatory diagram. The signal state of the wiper switch signal line 84 is either on or off, and indicates either "OFF", "LOW", or "HIGH" in conjunction with the wiper switch state, such as the communication line signal state. is not. In the case of FIG. 3A, the signal state of the wiper switch signal line 84 is turned on when the wiper switch state is "HIGH", and the wiper switch state is "OFF", "LOW", "INT", etc. Turns off in all other cases. For example, since the wiper switch state is "OFF" in the section A of FIG. 3A, both the communication line signal state and the wiper switch signal line signal state are "OFF" as shown in FIG. 3B. Since the wiper switch state is "LOW" in the section B, the communication line signal state is "LOW", but the wiper switch signal line signal state is "OFF". Since the wiper switch state is "HIGH" in the section C, the communication line signal state is "HIGH" and the wiper switch signal line signal state is "ON".

When the communication line signal state and the wiper switch signal line signal state change in the combination shown in FIG. 3B, the microcomputer 58 determines that the circuit related to the wiper switch 50 is normal, and determines that the circuit of the wiper switch 50 is normal. Performs control to generate the voltage applied to the windings.

The microcomputer 58 determines that the circuit related to the wiper switch 50 is abnormal except for the combination shown in FIG. 3B. For example, immediately after the ignition switch is turned on, when the communication line signal state is "OFF" and the wiper switch signal line signal state is "ON" as shown by the broken line, the wiper switch signal line 84 is abnormal. Is determined. In such a case, there is a possibility that the power line from the positive electrode of the battery 80 is in contact with the wiper switch signal line 84. Alternatively, when the communication line signal state is "LOW" and the wiper switch signal line signal state is "ON" as shown by the broken line, it is determined that the Ipaswitch signal line 84 is abnormal. Even in such a case, there is a possibility that the power line from the positive electrode of the battery 80 is in contact with the wiper switch signal line 84. In the present embodiment, it is determined whether or not the signal state is a normal signal state such as the combination shown in FIG. 3B, not the change of the signal when the wiper switch 50 is switched. When the ignition switch is on, the wiper switch 50 is operated regardless of whether or not the wiper switch 50 is operated. As a result, it can be determined whether or not the wiper switch signal line 84 is normal even when the wiper switch 50 is off as in the section A, and the timing when the wiper switch 50 is not operated as in the sections B and C. However, it can be determined whether or not the wiper switch signal line 84 is normal.

FIG. 4 compares the wiper switch state indicating the mode selection position of the wiper switch 50 of the wiper device 10 in a mode different from that of FIG. 3, the signal states of the communication lines 82A and 82B according to the LIN protocol, and the signal states of the wiper switch signal line 84. It is explanatory drawing which made it. Also in the case of FIG. 4, the signal state of the wiper switch signal line 84 is either on or off, and like the communication line signal state, “OFF”, “LOW”, and “HIGH” are linked to the wiper switch state. It does not indicate either of. In the case of FIG. 4A, the signal state of the wiper switch signal line 84 is turned on when the wiper switch state is “LOW” and “HIGH”, and turned off when the wiper switch state is “OFF”, “INT”, or the like. become. For example, since the wiper switch state is "OFF" in the section A of FIG. 4A, both the communication line signal state and the wiper switch signal line signal state are "OFF" as shown in FIG. 4B. Since the wiper switch state is "LOW" in the section B, the communication line signal state is "LOW" and the wiper switch signal line signal state is "ON". Since the wiper switch state is "HIGH" in the section C, the communication line signal state is "HIGH" and the wiper switch signal line signal state is "ON".

When the communication line signal state and the wiper switch signal line signal state change in the combination shown in FIG. 4B, the microcomputer 58 determines that the circuit related to the wiper switch 50 is normal, and determines that the circuit of the wiper switch 50 is normal. Performs control to generate the voltage applied to the windings.

The microcomputer 58 determines that the circuit related to the wiper switch 50 is abnormal except for the combination shown in FIG. 4 (B). For example, immediately after the ignition switch is turned on, when the communication line signal state is "OFF" and the wiper switch signal line signal state is "ON" as shown by the broken line, the wiper switch signal line 84 is abnormal. Is determined. In such a case, there is a possibility that the power line from the positive electrode of the battery 80 is in contact with the wiper switch signal line 84. In the present embodiment, it is determined whether or not the signal state is a normal signal state such as the combination shown in FIG. 4B, not the change of the signal when the wiper switch 50 is switched. When the ignition switch is on, the wiper switch 50 is operated regardless of whether or not the wiper switch 50 is operated. As a result, it can be determined whether or not the wiper switch signal line 84 is normal even when the wiper switch 50 is off as in the section A, and the timing when the wiper switch 50 is not operated as in the sections B and C. However, it can be determined whether or not the wiper switch signal line 84 is normal.

FIG. 5 is a flowchart showing an example of processing for confirming the states of the communication lines 82A and 82B and the wiper switch signal line 84 of the wiper device according to the present embodiment. The process shown in FIG. 5 is started when the ignition switch of the vehicle is turned on. In step 500, the communication line signal is received, and in step 502, the signal of the wiper switch signal line 84 is received.

In step 504, the signals of the communication lines 82A and 82B are compared with the signals of the wiper switch signal line 84, and in step 506, the combination of each signal is a predetermined combination shown in FIG. 3 (B) or FIG. 4 (B). Judge whether or not. In the case of an affirmative determination in step 506, the wiper switch signal line 84 is determined to be normal in step 508 and the process is terminated, and the microcomputer 58 determines that the wiper motor 18 is based on the communication line signal which is a command signal. Control rotation.

In the case of a negative determination in step 506, it is determined in step 510 that the wiper switch signal line 84 is abnormal, and the main ECU 92 causes the meter 96 to display the determination result via the meter ECU 94 and ends the process.

In the process shown in FIG. 5, when the wiper switch signal line 84 is abnormal, the main ECU 92 may stop the power supply to the wiper motor control circuit 22 to prevent damage to the wiper device 10.

As described above, in the present embodiment, the abnormality of the wiper switch signal line 84 is detected based on the combination of the signal states of the communication lines 82A and 82B and the signal state of the wiper switch signal line 84. Although there are various combinations of signal states, it is possible to determine the abnormality of the wiper switch signal line 84 based on the difference between these combinations.

Further, in the present embodiment, since the process of FIG. 5 is started when the ignition switch is turned on, the abnormality of the wiper switch signal line 84 can be detected even when the wiper switch is not operated.

10 ... Wiper device, 12 ... Windshield glass, 14, 16 ... Wiper, 18 ... Wiper motor, 20 ... Link mechanism, 22 ... Wiper motor control circuit, 24, 26 ... Wiper arm, 28, 30 ... Wiper blade, 32 ... Output shaft, 34 ... Crank arm, 36 ... Link rod, 38, 40 ... Pivot lever, 42, 44 ... Pivot shaft, 46 ... Link rod, 48 ... Memory, 50 ... Wiper switch, 52 ... Deceleration mechanism, 54 ... Rotation angle sensor, 56 ... Drive circuit, 58 ... Microcomputer, 60 ... Voltage detection circuit, 62 ... Signal input circuit, 66 ... Noise prevention coil, 68 ... Diode, 70 ... Sensor magnet, 72 ... CW current, 74 ... CCW current, 76 ... Current detection Unit, 80 ... Battery, 90 ... Temperature detection circuit, 92 ... Main ECU, 94 ... Meter ECU, 96 ... Meter, C1, C2 ... Electrolytic capacitor, P1 ... Upper inversion position, P2 ... Lower inversion position, P3 ... Storage position, R1 ... Resistance, RT ... Thermista, Tr1, Tr2, Tr3, Tr4 ... Transistor

Claims (2)

A wiper switch that inputs a command signal to change the wiping speed of the wiper blade,
The wiper switch is connected to the wiper switch via each of a first signal path through which the command signal is transmitted from the wiper switch and a second signal path through which a state signal indicating the state of the wiper switch is transmitted. When the combination with the state signal is a predetermined combination, the rotation of the wiper motor that wipes the wiper blade is controlled based on the command signal, and the command signal turns off immediately after the ignition switch is turned on. , And a control unit that determines that the second signal path is abnormal when the state signal indicates ON .
Wiper device including. A status display unit that displays the status of the wiper device and
A status display control unit that controls the status display unit,
With
The wiper device according to claim 1, wherein the state display control unit displays a determination result by the control unit on the state display unit.