JP6544995B2 - Control system for wiper system and control method for wiper system - Google Patents

Description

  The present invention relates to control technology of a wiper system for a vehicle, and more particularly to a control device and control method of a linked wiper system equipped with a motor capable of forward and reverse operation.

  Conventionally, as a wiper system mounted on a vehicle such as a car, a control wiper with a link using a motor capable of forward and reverse operation is known. In such a control wiper with a link, the wiper blade is reciprocated within a predetermined wiping range on the glass surface by appropriately controlling the operating angle of the wiper arm while operating the motor in forward and reverse directions. At that time, the motor as a drive source is electronically controlled by a drive circuit using an FET or the like, thereby realizing suppression of overrun of the wiper blade, prevention of lip wrinkles, and the like.

JP, 2001-26256, A JP, 2010-158978, A

  However, in the above-described linked control wiper, the normal wiping operation is performed while always operating the motor in forward and reverse directions, and the motor is accelerated from 0 rpm to the maximum rotation speed during half wiping and becomes 0 rpm again during reverse. As driven. As a result, acceleration and deceleration are frequently repeated during the operation of the wiper, so that the motor can not be driven efficiently, and it has been difficult to meet the demand for improvement of the electricity cost of the vehicle.

  In addition, since the wiper system is a component that secures visibility, it is important to continue operating as much as possible even if a failure occurs. However, when the drive circuit breaks down, the wiper stops and it becomes difficult to secure visibility. Was also a problem. At present, the reliability of drive circuits is secured by derating design based on desktop calculations, resistance confirmation by tests and evaluations, and inspection in processes, etc., but a response from the viewpoint of operation maintenance at the time of failure is required. It was being done.

  SUMMARY OF THE INVENTION The object of the present invention is to improve power consumption by switching between one-way rotation operation and forward / reverse rotation operation appropriately in a wiper system with a link mounted with a motor capable of forward / reverse operation, snow cover, circuit failure, etc. Another object of the present invention is to provide a wiper system control apparatus and control method that can be flexibly coped with.

A control system for a wiper system according to the present invention comprises a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement of the wiper blade, and the wiper blade and the wiper motor. A control mechanism for a wiper system, comprising: a link mechanism interposed between the wiper motor for reciprocating the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor; It has an operation mode switching unit for switching between a normal operation mode in which the wiper blade is caused to reciprocate by rotating only in one direction and a forward / reverse rotation mode in which the wiper motor is driven to reciprocate. The operation mode switching unit normally executes the normal operation mode, and the wiper motor is locked. Huang, which comprises carrying out the forward and reverse rotation mode to the wiper motor became the locked state.

  According to the present invention, the wiper blade can swing regardless of the rotational direction of the motor, and when the motor is in the “locked state”, the operation mode switching unit “operates the normal operation mode of the wiper motor”. Switch from “mode” to “forward / reverse mode”. In this way, the motor can be driven efficiently by rotation in only one direction during normal times to improve the electricity cost, and when the motor is in the “locked state”, the motor stop can be avoided and the motor can be operated within the operable range. The wiper blade is swung to secure the driver's visibility.

In the control system of the wiper system, the forward / reverse rotation mode may be implemented by the operation mode switching unit when the wiper blade is in an overrun state in which the wiper blade operates beyond a predetermined reverse position.

A control device of another wiper system according to the present invention includes a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement of the wiper blade, the wiper blade, and the wiper motor a control apparatus for a wiper system comprising comprising interposed, and a link mechanism for reciprocating in on the wiping surface of the wiper blade even in normal and reverse any operating state of the wiper motor between said It has an operation mode switching unit that switches between a normal operation mode in which the wiper motor is rotated only in one direction to reciprocate the wiper blade, and a forward / reverse rotation mode in which the wiper motor is driven to rotate in a positive / reverse direction. The operation mode switching unit normally performs the normal operation mode, and the wiper blade is in a predetermined reverse position. When it becomes overrun operating beyond is characterized by carrying out the forward-reverse mode.

  In the present invention, the wiper blade can swing regardless of the rotational direction of the motor, and when the wiper blade is in the “overrun state”, the operation mode switching unit sets the operation mode of the wiper motor Switch from the normal operation mode to the forward / reverse mode. As a result, the motor is driven efficiently by rotation in only one direction during normal times to improve the cost of electricity, and the operating angle is adjusted according to the operating conditions of the blade to stabilize the reverse position.

The control device for each wiper system described above is provided with a first circuit for rotating the wiper motor in one direction, and a second circuit for rotating the wiper motor in the opposite direction to the first circuit, and the operation mode switching unit The wiper motor may be driven in one direction by the first circuit in the normal operation mode, and the wiper motor may be driven in the forward and reverse directions by the first circuit and the second circuit in the forward and reverse rotation mode.

The control device for each wiper system described above is provided with a first circuit for rotating the wiper motor in one direction, and a second circuit for rotating the wiper motor in the opposite direction to the first circuit, and the operation mode The switching unit may implement an emergency mode in which the wiper motor is driven by the second circuit when the first circuit fails.

A control device of another wiper system according to the present invention includes a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement of the wiper blade, the wiper blade, and the wiper motor And a link mechanism configured to reciprocate the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor, A first circuit that causes the wiper motor to rotate in one direction to reciprocate the wiper blade; a second circuit that causes the wiper motor to rotate in the opposite direction to the first circuit to reciprocate the wiper blade; A normal operation mode connected to the circuit and the second circuit for driving the wiper motor by the first circuit, and the first circuit is broken If, characterized by having a a working mode switching part for switching between emergency mode for driving the wiper motor by said second circuit.

  In the present invention, the wiper blade is swingable regardless of the rotational direction of the motor, and the first circuit for rotating the wiper motor in one direction and the wiper motor for rotating in the opposite direction to the first circuit Two circuits are provided, and in the event of a circuit failure, the operation mode of the wiper motor is switched from the “normal operation mode” to the “emergency mode” by the operation mode switching unit. As a result, it is possible to prevent the motor from stopping and to operate the wiper blade continuously, thereby securing the driver's visibility.

A control method of a wiper system according to the present invention comprises: a wiper blade performing reciprocating wiping operation on a wiping surface; a wiper motor capable of forward and reverse operation for reciprocating wiping movement of the wiper blade; and the wiper blade and the wiper motor A link mechanism is interposed between the wiper motor for reciprocating the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor, and the wiper motor is reciprocated by rotating the wiper motor in only one direction. normal operating mode for, and a method of controlling a wiper system comprising a control unit for operating the wiper motor to the wiper motor of the wiper blade by normal and reverse rotation driven in one of forward and reverse mode to reciprocate , the control section, and the step of performing the normal operation mode to the normal, the wiper motor is b And executes a step of carrying out the forward-reverse mode for the wiper motor, wherein became locked state when a click state, the.

  The wiper blade is pivotable regardless of the rotational direction of the motor, and when the motor is in the “locked state”, the operation mode of the wiper motor is switched from the “normal operation mode” to the “forward / reverse mode”. In this way, the motor can be driven efficiently by rotation in only one direction during normal times to improve the electricity cost, and when the motor is in the “locked state”, the motor stop can be avoided and the motor can be operated within the operable range. The wiper blade is swung to secure the driver's visibility.

In the control method of the wiper system, the forward / reverse rotation mode may be implemented when the wiper blade is in an overrun state in which it operates beyond a predetermined reverse position.

Another control method of the wiper system according to the present invention includes a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping the wiper blade, the wiper blade, and the wiper motor is interposed between, and a link mechanism for reciprocating the wiper blade in the said wiping surface even in normal and reverse any operating state of the wiper motor, the wiper blade by rotating the wiper motor in only one direction A control method of a wiper system , comprising: a normal operation mode for reciprocating , and a control unit for operating the wiper motor in one of forward and reverse rotation modes for reciprocating the wiper blade by driving the wiper motor forward and reverse. a step there, where the control unit performs the normal operation mode to the normal time, the Waipabure There and executes the steps of: performing the reverse rotation mode when a overrun operating beyond a predetermined reversing position.

  In the present invention, the wiper blade can swing regardless of the rotational direction of the motor, and when the wiper blade is in the “overrun state”, the operation mode of the wiper motor is changed from “normal operation mode” to “normal operation mode”. Switch to forward / reverse mode. As a result, the motor is driven efficiently by rotation in only one direction during normal times to improve the cost of electricity, and the operating angle is adjusted according to the operating conditions of the blade to stabilize the reverse position.

The control method of the above wiper system, provided in the wiper system, a first circuit for rotating said wiper motor in one direction, and a second circuit for rotating in the opposite direction to the said wiper motor said first circuit, said The control unit may drive the wiper motor in one direction by the first circuit in the normal operation mode, and drive the wiper motor in the forward and reverse directions by the first circuit and the second circuit in the forward and reverse mode. .

Further, the wiper system is provided with a first circuit for rotating the wiper motor in one direction, and a second circuit for rotating the wiper motor in the opposite direction to the first circuit, and the control unit is configured to The step of performing an emergency mode of driving the wiper motor by the second circuit may be performed when the circuit fails.

Another control method of the wiper system according to the present invention includes a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping the wiper blade, the wiper blade, and the wiper motor wiper system comprising a control unit for operating the link mechanism for reciprocating, the wiper motor at on the wiping surface of the wiper blade is also interposed, in normal and reverse any operating state of the wiper motor between The wiper system further includes a first circuit rotating the wiper motor in one direction to reciprocate the wiper blade, and rotating the wiper motor in the opposite direction to the first circuit. and a second circuit for reciprocating the wiper blade, wherein the said control unit, by conventional first circuit during Waipamo And performing a normal operation mode for driving the motor, and executes the steps of: performing a emergency mode for driving the wiper motor by said second circuit when said first circuit has failed.

  In the present invention, the wiper blade is swingable regardless of the rotational direction of the motor, and the first circuit for rotating the wiper motor in one direction and the wiper motor for rotating in the opposite direction to the first circuit Two circuits are provided, and in the event of a circuit failure, the operation mode of the wiper motor is switched from the "normal operation mode" to the "emergency mode". As a result, it is possible to prevent the motor from stopping and to operate the wiper blade continuously, thereby securing the driver's visibility.

  In addition, you may use the FET module for three-phase brushless motor drive provided with seven FET as said FET module. By using such a module for a three-phase brushless motor, it is possible to construct the control device with a general-purpose product without creating a dedicated electronic component, and to reduce the product cost.

According to the control system of the wiper system of the present invention, the wiper blade performing reciprocating wiping operation on the wiping surface, the wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse operation of the wiper motor In a wiper system including a link mechanism that reciprocates the wiper blade on the wiping surface even in the state, a normal operation mode in which the wiper motor is rotated in one direction only, and a forward / reverse mode in which the wiper motor is driven forward / reversely The normal operation mode is implemented by the operation mode switching unit under normal conditions, and the forward / reverse rotation mode is performed for the wiper motor that is locked when the wiper motor is locked. In general, the motor can be efficiently driven by rotation in only one direction to improve the electricity cost. One, when the motor becomes "locked state", the wiper blade is swung and it is possible to achieve ensure visibility of the driver while avoiding motor stop.

According to another control system of a wiper system of the present invention, a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse wiper motor And a link mechanism that reciprocates the wiper blade on the wiping surface even in the operation state, and a normal operation mode in which the wiper motor is rotated in one direction only, and forward / reverse rotation driving the wiper motor forward / reversely. An operation mode switching unit is provided to switch between the modes, and the normal operation mode is implemented by the operation mode switching unit under normal conditions, and the forward / reverse mode is implemented when the wiper blade is in the “overrun state”. Therefore, the wiper blade can normally drive the motor efficiently by rotating only in one direction to improve the electricity cost. When it becomes overrun state ", and adjust the operating angle in accordance with the operating status of the blade, it is possible to stabilize the turning position.

According to another control system of a wiper system of the present invention, a wiper blade performing reciprocating wiping operation on a wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse wiper motor A wiper mechanism including a link mechanism that reciprocates the wiper blade on the wiping surface even in the operation state, the first circuit for rotating the wiper motor in one direction, and the wiper motor in the opposite direction to the first circuit And an operation mode switching unit for switching between a normal operation mode for rotating the wiper motor only in one direction and a forward / reverse rotation mode for driving the wiper motor in a single direction while providing a second circuit for rotating the Switch the operation mode of the wiper motor from “normal operation mode” to “emergency mode” by the mode switching unit. Since, even if the circuit failure, to avoid motor stop can be continued operation of the wiper blade, thereby making it possible to ensure visibility of the driver.

According to the control method of the wiper system of the present invention, the wiper blade performing reciprocating wiping operation on the wiping surface, the wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse operation of the wiper motor Even in the state, the wiper motor is operated in one of the link mechanism which causes the wiper blade to reciprocate on the wiping surface, the normal operation mode which rotates the wiper motor only in one direction, and the forward / reverse mode which drives the wiper motor forward or reverse . at wiper system comprising a control unit, a control unit, and performing a normal operation mode to the normal time, the forward reverse mode for wiper motor reaches the locked state when the wiper motor is in a locked state because be executed a step of performing, the, normal time efficiently motor by rotation in one direction only While improving fuel efficiency by moving, when it becomes the motor being "locked state", the wiper blade is swung and it is possible to achieve ensure visibility of the driver while avoiding motor stop.

According to another control method of the wiper system of the present invention, a wiper blade performing reciprocating wiping operation on the wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse of the wiper motor a link mechanism for reciprocating the wiper blade in the wiping plane is also in the operating state of the normal operating mode for rotating the wiper motor only in one direction, and, one at a wiper motor of a forward and reverse mode to forward and reverse drive the wiper motor a control unit that operates at a wiper system with a, when the control unit has made a step of performing a normal operation mode to the normal, an overrun state where the wiper blade is operated beyond a predetermined reversing position and performing a reverse rotation mode. Thus the running efficiency of the motor by the rotation of the normal time only one direction When the wiper blade is in the “overrun state”, the operation angle can be adjusted according to the operating condition of the blade to stabilize the reverse position while the power consumption is improved. .

According to another control method of the wiper system of the present invention, a wiper blade performing reciprocating wiping operation on the wiping surface, a wiper motor capable of forward and reverse operation for reciprocating wiping movement, and forward or reverse of the wiper motor A first circuit for rotating the wiper motor in one direction by the wiper system including the link mechanism that reciprocates the wiper blade on the wiping surface even in the operation state of the second embodiment and the control unit for operating the wiper motor; Providing a second circuit for rotating the wiper motor in the opposite direction to the circuit , the control unit performing a normal operation mode for driving the wiper motor by the first circuit at a normal time, and the second circuit when the first circuit fails and performing a emergency mode for driving the wiper motor by. Thus to run, even if the circuit failure, Over data avoids stopping the wiper blade can be continued operated, thereby making it possible to ensure visibility of the driver.

BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing which shows the structure of the wiper system to which the control apparatus and control method which are one embodiment of this invention are applied. It is a block diagram which shows the circuit structure of the controller used with the wiper system of FIG. It is a block diagram showing composition of a control system of a controller. It is a flowchart which shows the procedure of the control processing by this invention. FIG. 6 is a block diagram showing a circuit configuration of a controller used in a wiper system using a brushless motor.

  Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is an explanatory view showing a configuration of a wiper system to which a wiper system control apparatus and control method according to an embodiment of the present invention is applied. As shown in FIG. 1, the wiper system 1 includes wiper arms 2 a and 2 b on a driver's seat side and a passenger seat side, and the wiper arms 2 a and 2 b are connected by a link mechanism 3. Wiper blades 4a and 4b for wiping the glass surface are attached to the respective wiper arms 2a and 2b. The wiper blades 4a and 4b resiliently contact the windshield (the wiping surface) 5 by a spring member (not shown) or the like installed inside the wiper arms 2a and 2b. The link mechanism 3 is connected to the motor unit 6, and the wiper blades 4 a and 4 b are driven by the motor unit 6. In the wiper system 1, the link mechanism 3 causes the wiper blades 4a and 4b to swing on the windshield 5 regardless of whether the motor rotates in the forward or reverse direction.

  The motor unit 6 includes a wiper motor 7 and a reduction mechanism 8. A sensor for detecting the relative position of the wiper blades 4a and 4b is provided on the wiper motor 7 side, and a sensor for detecting the absolute position (for example, lower reverse position) of the wiper blades 4a and 4b is provided on the speed reduction mechanism 8 side. ing. The relative position detection sensor generates a pulse signal as the motor rotates. In addition, a single-shot signal is issued from the absolute position detection sensor when the wiper blades 4a and 4b come to the lower reversing position.

  A controller (wiper system control device) 9 is integrally provided in the motor unit 6. A brush motor is used as the wiper motor 7 and is controlled by the controller 9. FIG. 2 is a block diagram showing a circuit configuration of the controller 9. As shown in FIG. 2, the controller 9 includes a CPU 21 in which a control program is installed. The CPU 21 is connected to a controller (ECU) on the vehicle side (not shown) via the in-vehicle LAN 22. The controller 9 is further provided with a first drive circuit 23, a second drive circuit 24, and an FET module 10. The CPU 21 controls ON / OFF and the rotational speed of the wiper motor 7 based on the command sent from the ECU.

  The FET module 10 is divided into a battery reverse connection protection unit 31 and a wiper motor drive unit 32. One FET 34 a is disposed in the battery reverse connection protection unit 31, and four FETs 34 b to 34 e are disposed in the wiper motor drive unit 32. In the wiper motor drive unit 32, a bridge circuit is formed by the FETs 34b to 34e so that forward and reverse driving of the wiper motor 7 is possible. In this case, the FETs 34c and 34d form a forward drive circuit C1 (first circuit) for motor forward rotation, and a FET 34b and 34e form a reverse drive circuit C2 (second circuit) for motor reverse rotation. In the wiper system 1, normally, the normal rotation drive circuit C1 is used, and the wiper motor 7 is rotated (normal rotation) at a substantially constant rotational speed in only one direction to operate the wiper blades 4a and 4b. As described above, since the wiper motor 7 normally rotates only in one direction at a constant speed, the motor can be efficiently driven as compared with the case where acceleration and deceleration of the motor are repeated, and the cost of electricity can be improved.

  FIG. 3 is a block diagram showing a configuration of a control system in the controller 9. As shown in FIG. 3, the CPU 21 is provided with a blade position detection unit 25 that calculates the current positions of the wiper blades 4 a and 4 b based on the signals of the absolute position detection sensor and the relative position detection sensor. The blade position detection unit 25 calculates the current position of the wiper blades 4a and 4b by integrating the single-shot signal from the absolute position detection sensor and the pulse signal input from the relative position detection sensor after the single-shot signal is input. Further, the CPU 21 is provided with a blade speed detection unit 26 that detects the current movement speed of the wiper blades 4a and 4b based on the pulse signal of the relative position detection sensor.

  The CPU 21 is provided with a motor lock detection unit 27 that detects the presence or absence of lock generation of the wiper motor 7. The motor lock detection unit 27 determines the presence or absence of motor lock occurrence based on the blade speed detected by the blade speed detection unit 26 or the value of a current sensor (not shown). The CPU 21 is further provided with an overrun detection unit 28 which detects a so-called overrun in which the wiper blades 4a and 4b move beyond the upper reversing position. The overrun detection unit 28 compares the blade position detected by the blade position detection unit 25 with a predetermined upper reverse position, and detects the presence or absence of the occurrence of overrun of the wiper blades 4a and 4b.

  The CPU 21 further includes a circuit failure detection unit 29 that detects a circuit failure in the FET module 10 (for example, an open failure of the FETs 34c and 34d of the normal rotation drive circuit C1). The circuit failure detection unit 29 constantly monitors the state of the normal rotation drive circuit C1, and detects the presence or absence of the circuit failure occurrence based on the current value, voltage value, and the like of the circuit. In addition, the operation mode switching unit 30 switches the drive mode of the wiper motor 7 in the CPU 21 when the lock occurrence of the wiper motor 7, the overrun of the wiper blades 4a and 4b, the failure of the forward rotation drive circuit C1 and the like occur. It is provided. The wiper motor 7 is driven and controlled in three modes of “normal operation mode”, “forward and reverse mode”, and “emergency mode” based on the command of the operation mode switching unit 30.

  In the wiper system 1 having such a configuration, the following control process is performed. FIG. 4 is a flowchart showing the procedure of control processing according to the present invention, and the processing of FIG. 4 is executed by the controller 9. In the control process of FIG. 4, first, at step S1, the motor lock detection unit 27 determines whether the wiper motor 7 is in the locked state. If the wiper motor 7 is not in the locked state, the process proceeds to step S2, and the blade position detection unit 25 determines whether the wiper blades 4a and 4b are overrun. In this case, since the overrun of the wiper blades 4a and 4b is easily generated by the wind pressure at high speed traveling, the overrun detection unit 28 presumes that the probability of occurrence of the overrun is high when the vehicle speed becomes a predetermined value or more. We assume that "overrun occurs".

  If it is determined in step S1 that the "locked state" has been selected and if the overrun has been determined in step S2, the process proceeds to step S3 to execute the "forward / reverse mode". The “forward and reverse mode” is determined and implemented by the operation mode switching unit 30. As described above, in the wiper system 1, normally, the wiper motor 4 is rotated forward (one direction rotation) by the forward rotation drive circuit C1 to operate the wiper blades 4a and 4b. On the other hand, when the operation mode switching unit 30 determines to execute the “forward / reverse mode”, the CPU 21 appropriately turns on and off the FETs 34 b to 34 e by the first and second drive circuits 23 and 24 to positively drive the wiper motor 7. Drive in reverse. That is, by turning on the FETs 34a, 34c and 34d, the forward rotation drive circuit C1 of the wiper motor drive unit 32 is opened to rotate the wiper motor 7 forward, and forward movement of the wiper blade 4a (lower reverse position → upper reverse position )). Further, by turning on the FETs 34a, 34b, 34e, the reverse rotation drive circuit C2 is opened to reverse the wiper motor 7, and the return path operation (upper reverse position → lower reverse position) of the wiper blade 4a is performed.

  In the “forward and reverse rotation mode”, the wiper motor 7 is controlled to rotate in the normal and reverse directions based on the position information of the wiper blades 4 a and 4 b acquired from the blade position detection unit 25. As a result, the wiper blades 4a and 4b perform the reciprocating wiping operation between the vertically reversed positions on the glass surface. When the "locked state" shifts to the "forward / reverse mode", the positions of the wiper blades 4a and 4b where the "locked state" is generated are stored, and the reciprocating wiping operation is performed between the position and the inverted position. Be done. Therefore, even when the wiper motor 7 is locked due to snow, an obstacle, or the like, the motor does not stop and the wiper blades 4a and 4b reversely operate so as to separate from the obstacle, thereby prolonging the visibility. In addition, even if the wiper blades 4a and 4b overrun during high-speed traveling, etc., the wiper motor 7 is controlled forward and reverse based on the blade position information, so that the blade operating angle can be adjusted according to the situation. It is possible to guarantee the position.

  Next, if “locked state” or “overrun occurrence” is not detected in step S1,2, the process proceeds to step S4, and it is determined whether or not there is a failure in the normal rotation drive circuit C1. When it is confirmed in step S4 that normal rotation drive circuit C1 is normal, the process proceeds to step S5, the control in the "normal operation mode" is performed, and the one-way rotational drive of the motor is maintained and the routine is exited. . On the other hand, when a failure of the normal rotation drive circuit C1 is detected in step S4, the process proceeds to step S6, and the "emergency mode" is performed.

  In the "emergency mode", the wiper motor 7 is driven by the reverse drive circuit C2 instead of the forward drive circuit C1, and the wiper motor 7 is driven to rotate in the reverse direction. As described above, the wiper system 1 is configured such that the wiper blades 4a and 4b swing on the windshield 5 regardless of whether the motor rotates in either the forward or reverse direction. Even in the case of “1”, the wiper blades 4a and 4b swing on the windshield 5 in the same manner as normal. However, since the normal rotation drive circuit C1 has a failure, the failure notification operation such as lighting of the failure indicator or increase in blade operation speed (set to HI operation) is performed to notify the driver of the failure occurrence. . As a result, even if a failure occurs in the forward rotation drive circuit C1, the operation of the wiper motor 7 is maintained using the reverse rotation drive circuit C2 as a backup, so that the wiping operation of the wiper blades 4a and 4b is continued even in the circuit failure. It is possible to secure the driver's visibility. Further, the failure notification operation can surely notify the driver of the occurrence of a failure.

  Thus, in the wiper system 1, the wiper blades 4a and 4b can swing regardless of the rotational direction of the motor, and the operation mode of the wiper motor 7 It is possible to switch from the normal operation mode to the "forward / reverse mode" or the "emergency mode". For this reason, in the case of "locked state" or "overrun occurrence", the motor stop is avoided in the "forward / reverse mode" to ensure visibility, or the operation angle is adjusted according to the blade status to reverse position It is possible to stabilize the Further, even in the event of a circuit failure, the "emergency mode" can prevent the motor from stopping and allow the wiper blade to be operated continuously, which makes it possible to secure the driver's visibility.

It goes without saying that the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the invention.
For example, although the above-mentioned embodiment showed an example which applied the present invention to a wiper system which made a brushed motor a drive source, the present invention is applicable also to a wiper system which makes a brushless motor a drive source. FIG. 5 is a block diagram showing a circuit configuration of a controller used in a wiper system using a brushless motor (wiper motor) 51. As shown in FIG. In FIG. 5, the same parts as those of the controller 9 in FIG. As shown in FIG. 5, in the wiper system, an FET module 53 including an FET 52a for preventing reverse connection and FETs 52b to 52g for driving each phase is used. The CPU 21 appropriately turns on and off the FETs 52b to 52g by the first and second drive circuits 23 and 24 to form a three-phase rotating magnetic field to drive the brushless motor 51 forward and reverse.

  In addition, as the FET module 10 in the controller 9, a general-purpose FET module 53 used for driving a three-phase brushless motor as shown in FIG. 5 may be used. Usually, the FET module for three-phase driving includes one reverse connection preventing one (FET 52a) and seven FETs 52b to 52g in total of two × 3 for driving each phase. That is, six FETs 52 b to 52 g are mounted in the general-purpose 7 FET module in addition to the reverse connection prevention. On the other hand, in the wiper system of the embodiment, four FETs are required for forward and reverse drive of the wiper motor 7, and an FET module 53 having six FETs for driving the motor can be sufficiently used. For this reason, it is also possible to use an inexpensive general purpose module such as the FET module 53 for the wiper system of the embodiment. In the case of the 7-FET module, although two FETs are surplus, it is also possible to use this for driving a washer motor used in a window washer device, driving a rear wiper, and the like.

  On the other hand, when the system is stopped and the blade is stopped at the lower turning position, if the state continues for a long time, there is a risk that the blade rubber may be bent. For this reason, when the wiper switch is turned off and the wiper blade stops at the lower reverse position to prevent the rubber from being scratched, the motor is rotated by an angle at which the lip turns back from the lower reverse position, and the lip portion is moved forward You may make it perform "lip folding operation" which is corrected to. The "lip return operation" is performed when the wiper motor 7 is not operated for a long time (for example, 10 minutes) by the timer 41 provided in the controller 9. Therefore, when the rain stops, the car is parked, the wiper switch or the ignition switch is turned off, and the wiper motor 7 is stopped after the predetermined time, the lip reversing operation unit 42 in the controller 9 Is driven a little on the outgoing side. This makes it possible to prevent the lip of the blade rubber from being folded back in the forward movement direction, and to prevent bending in the opposite direction.

  Furthermore, in the embodiment described above, there is shown a control form having both the “forward and reverse drive mode” at the time of locking and overrun and the “emergency mode” at the time of failure of the forward rotation drive circuit C1 other than the normal operation mode. For example, a mode having "normal operation mode" and "forward and reverse drive mode" and no "emergency mode", or "normal operation mode" and "emergency mode" and "forward and reverse drive mode" It is also possible to adopt a controller / control method that implements only the "normal operation mode" and one of the operation modes, as in the mode not having it.

1 Wiper system 2a, 2b Wiper arm 3 Link mechanism 4a, 4b Wiper blade 5 Windscreen 6 Motor unit 7 Wiper motor 8 Reduction mechanism 9 Controller 10 FET module 21 CPU
22 In-vehicle LAN
23 first drive circuit 24 second drive circuit 25 blade position detection unit 26 blade speed detection unit 27 motor lock detection unit 28 overrun detection unit 29 circuit failure detection unit 30 operation mode switching unit 31 battery reverse connection protection unit 32 wiper motor drive unit 34a to 34e FET
41 timer 42 lip reverse operation unit 51 brushless motor (wiper motor)
52a to 52g FET
53 FET Module C1 Forward Drive (First Circuit)
C2 reverse drive circuit (second circuit)

Claims (12)

A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
Control of a wiper system comprising: a link mechanism interposed between the wiper blade and the wiper motor, for reciprocating the wiper blade on the wiping surface in any of forward and reverse operating states of the wiper motor A device,
There is an operation mode switching unit that switches between a normal operation mode in which the wiper motor is rotated only in one direction to reciprocate the wiper blade, and a normal / reverse mode in which the wiper motor is driven to rotate forward and backward and the wiper blade is reciprocated. And
The operation mode switching unit normally performs the normal operation mode, and when the wiper motor is in the locked state, performs the forward / reverse mode with respect to the wiper motor in the locked state. Control system for the wiper system. A control system for a wiper system according to claim 1, wherein
The operating mode switching unit further control device for a wiper system, characterized in that said wiper blade is to implement the forward-reverse mode when it becomes overrun operating beyond a predetermined reversing position. A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
Control of a wiper system comprising: a link mechanism interposed between the wiper blade and the wiper motor, for reciprocating the wiper blade on the wiping surface in any of forward and reverse operating states of the wiper motor A device,
There is an operation mode switching unit that switches between a normal operation mode in which the wiper motor is rotated only in one direction to reciprocate the wiper blade, and a normal / reverse mode in which the wiper motor is driven to rotate forward and backward and the wiper blade is reciprocated. And
The operation mode switching unit normally performs the normal operation mode, and performs the forward / reverse mode when the wiper blade is in an overrun state in which the wiper blade operates beyond a predetermined reverse position. Control system for the wiper system. A control system of a wiper system according to any one of claims 1 to 3, wherein
And a second circuit for rotating the wiper motor in a direction opposite to the first circuit.
The operation mode switching unit drives the wiper motor in one direction by the first circuit in the normal operation mode, and causes the wiper motor to rotate in the forward and reverse directions by the first circuit and the second circuit in the forward and reverse mode. control device for a wiper system according to claim. A control system of a wiper system according to any one of claims 1 to 4, wherein
And a second circuit for rotating the wiper motor in a direction opposite to the first circuit.
The control system for a wiper system , wherein the operation mode switching unit implements an emergency mode in which the wiper motor is driven by the second circuit when the first circuit fails. A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
Control of a wiper system comprising: a link mechanism interposed between the wiper blade and the wiper motor, for reciprocating the wiper blade on the wiping surface in any of forward and reverse operating states of the wiper motor A device,
A first circuit that rotates the wiper motor in one direction to reciprocate the wiper blade;
A second circuit for rotating the wiper blade back and forth by rotating the wiper motor in a direction opposite to the first circuit;
A normal operation mode connected to the first circuit and the second circuit and driving the wiper motor by the first circuit; and an emergency mode driving the wiper motor by the second circuit when the first circuit fails. And an operation mode switching unit for switching the control unit. A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
A link mechanism interposed between the wiper blade and the wiper motor to reciprocate the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor;
The wiper motor is operated in one of a normal operation mode in which the wiper motor is rotated only in one direction to reciprocate the wiper blade, and a forward or reverse mode in which the wiper motor is driven to reciprocate the wiper blade. Control unit, and
A control method of a wiper system provided with
The control unit
Performing the normal operating mode at normal times;
Implementing the forward / reverse rotation mode with respect to the wiper motor that is in the locked state when the wiper motor is in the locked state;
And controlling a wiper system. The control method of the wiper system according to claim 7, wherein
The method of controlling a wiper system according to claim 1, wherein the forward / reverse rotation mode is further implemented when the wiper blade is in an overrun state in which the wiper blade operates beyond a predetermined reverse position. A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
A link mechanism interposed between the wiper blade and the wiper motor to reciprocate the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor;
The wiper motor is operated in one of a normal operation mode in which the wiper motor is rotated only in one direction to reciprocate the wiper blade, and a forward or reverse mode in which the wiper motor is driven to reciprocate the wiper blade. Control unit, and
A control method of a wiper system provided with
The control unit
Performing the normal operating mode at normal times;
Implementing the forward and reverse mode when the wiper blade is in an overrun condition to operate beyond a predetermined reverse position;
And controlling a wiper system. The control method of the wiper system according to any one of claims 7 to 9, wherein
The wiper system further includes a first circuit for rotating said wiper motor in one direction, and a second circuit for rotating in the opposite direction to the said wiper motor said first circuit,
The control unit causes the wiper motor to drive in one direction by the first circuit in the normal operation mode, and causes the wiper motor to rotate in the forward and reverse directions by the first circuit and the second circuit in the forward and reverse rotation mode. Control method of the wiper system. The control method of the wiper system according to any one of claims 7 to 10, wherein
The wiper system further includes a first circuit for rotating the wiper motor in one direction, and a second circuit for rotating the wiper motor in the opposite direction to the first circuit.
Wherein the control unit is when said first circuit has failed, the control method of the wiper system, characterized by performing the step of performing the emergency mode for driving the wiper motor by said second circuit. A wiper blade that performs reciprocating wiping operation on the wiping surface;
A forward / reverse operable wiper motor for reciprocating the wiper blade;
A link mechanism interposed between the wiper blade and the wiper motor to reciprocate the wiper blade on the wiping surface in either forward or reverse operation of the wiper motor;
And a control unit for operating the wiper motor.
The wiper system further includes a first circuit for rotating the wiper motor in one direction to reciprocate the wiper blade, and a wiper motor for rotating the wiper blade in a direction opposite to the first circuit to reciprocate the wiper blade. Having two circuits,
The control unit
Performing a normal operating mode of driving the wiper motor by the first circuit at normal times;
Implementing an emergency mode of driving the wiper motor by the second circuit if the first circuit fails;
And controlling a wiper system.

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