JP5460305B2 - Wiper control device and wiper control method - Google Patents

Description

  The present invention relates to an overrun prevention technique in a vehicle wiper device, and is particularly effective for preventing a phenomenon in which an overrun state occurs due to the blade tip expanding at the upper reversal position due to the deflection of a wiper arm or wiper blade during high-speed traveling. The present invention relates to a wiper control device and a wiper control method.

  2. Description of the Related Art Conventionally, in a wiper device for an automobile, a wiper that detects the current position of a wiper blade (hereinafter abbreviated as a blade) on a glass surface and performs a reciprocating wiping operation between the upside down position of the blade based on the detected data. The system is widely used. In such a wiper system, the operation of the wiper driving motor is controlled so as to invert the blade at a predetermined upside down position. The wiper drive motor is driven by a vehicle-mounted control device, and the operation of the motor is controlled so that the motor shaft stops at an angle corresponding to the upside down position.

Special table 2003-525167 gazette JP 2008-245473 A

  In the conventional wiper system as described above, overrun of the blade at the upside down position is suppressed by performing control so that the operating angle of the motor shaft does not change during normal traveling. However, when traveling at high speeds, the wiper arm, the blade, the link mechanism, etc. bend due to the traveling wind, which causes a problem that the blade tip position is widened when turning up. That is, during high-speed running, there is a problem in that an overrun condition occurs due to the blade tip spreading even if the motor shaft is controlled at a predetermined angle. In this case, such a problem can be avoided if the wiping angle at the time of normal wiping is set to be narrow in consideration of overrun at high speed. However, if the wiping angle during normal wiping is narrowed, there is an adverse effect that the driver's field of view during raining is narrowed, and a system that can secure a field of view during normal wiping while preventing overrun during high-speed driving. It was desired.

  An object of the present invention is to control a wiper control device and control capable of ensuring a visual field during normal wiping while preventing overrun during high speed running by suppressing overrun caused by deflection of a wiper arm or the like during high speed running It is to provide a method.

  A wiper control device according to the present invention is a wiper control device that performs drive control of a wiper device that includes a wiper blade disposed on a wiping surface of a vehicle, and an electric motor that drives the wiper blade. A storage unit for storing a point value set corresponding to a load state of the motor; and a current load state of the electric motor is detected, and the electric motor is detected based on the point value of the storage unit from the load state. A point value calculation unit for calculating the load point value of the motor, a point value addition unit for calculating the accumulated load point by accumulating the load point value, and the difference between the accumulated load points of the forward operation and the return operation of the wiper blade And a point comparison unit that compares a predetermined threshold value, and a wind pressure caused by traveling wind on the wiper blade based on a comparison result in the point comparison unit A wiping state determination unit that detects the influence of the load and identifies whether the vehicle is in a high-speed traveling state, and a motor drive that issues an operation command to the electric motor based on the identification result in the wiping state determination unit And a command unit.

  In the present invention, with respect to the point value set corresponding to the load state of the motor, paying attention to the difference between the total value of the forward path and the total value of the return path, the difference between the two accumulated load points is compared with a predetermined threshold value. Thus, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected to identify whether or not the vehicle is in a high-speed traveling state. When the vehicle is in a high-speed traveling state, for example, the blade overrun is suppressed by narrowing the wiping angle of the wiper blade.

  In the wiper control device, the wiping state determination unit determines that the vehicle is in a high-speed traveling state when a difference between accumulated load points of the forward operation and the backward operation of the wiper blade exceeds the threshold value, The motor drive command unit may be instructed to reduce the rotation angle of the electric motor and narrow the wiper blade wiping angle.

  Another wiper control device of the present invention is a wiper control device that performs drive control of a wiper device that includes a wiper blade disposed on a wiping surface of a vehicle, and an electric motor that drives the wiper blade, A storage unit that stores a point value set corresponding to the load state of the electric motor, and detects a current load state of the electric motor, and based on the point value of the storage unit from the load state, A point value calculating unit for calculating a load point value of the electric motor; a point value adding unit for calculating the accumulated load point by accumulating the load point value; an accumulated load point and a first threshold value in a forward operation of the wiper blade The cumulative load point and the second threshold value in the return path operation of the wiper blade, and the difference between the cumulative load point in the forward and return path operations of the wiper blade Whether or not the vehicle is in a high-speed running state by detecting the influence of wind pressure load caused by running wind on the wiper blade based on the comparison result of the point comparison unit comparing the third threshold value and the point comparison unit. , A wiping state determination unit, and a motor drive command unit that issues an operation command to the electric motor based on the identification result in the wiping state determination unit.

  In the present invention, the point value set corresponding to the load state of the motor is classified into the total value of the wiper blade forward operation, the total value of the return operation, and the difference between them, and the operation state of the wiper is determined. Classify more finely. Then, by comparing each value with a predetermined threshold, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected, and whether the vehicle is in a high-speed driving state is identified, and the vehicle is in a high-speed driving state. In such a case, for example, the blade overrun is suppressed by narrowing the wiping angle of the wiper blade.

  In the wiper control device, the wiping state determination unit is configured such that the cumulative load point in the forward movement operation of the wiper blade is less than the first threshold value, and the cumulative load point in the backward movement operation of the wiper blade is greater than or equal to the second threshold value. If the difference between the accumulated load points of the forward operation and the backward operation of the wiper blade is equal to or greater than the third threshold value, the vehicle is determined to be in a high speed traveling state, and the motor drive command unit is An instruction to reduce the rotation angle of the electric motor and to narrow the wiping angle of the wiper blade may be issued. Further, different values may be set as the first to third threshold values depending on whether the operation of the wiper blade is Hi or Lo.

  A wiper control method according to the present invention is a wiper control method applied to a wiper device including a wiper blade disposed on a wiping surface and an electric motor that drives the wiper blade, wherein the load of the electric motor is A point value corresponding to the state is set, a current load state of the electric motor is detected, a load point value of the electric motor is calculated based on the point value from the load state, and the load point value is calculated. Accumulated to calculate the accumulated load point, and compares the difference between the accumulated load points of the forward movement and the backward movement of the wiper blade with a predetermined threshold value, and based on the comparison result, depending on the traveling wind for the wiper blade Detecting the influence of the wind pressure load to identify whether or not the vehicle is in a high-speed running state, and controlling the operation of the electric motor based on the identification result And butterflies.

  In the present invention, with respect to the point value set corresponding to the load state of the motor, paying attention to the difference between the total value of the forward path and the total value of the return path, the difference between the two accumulated load points is compared with a predetermined threshold value. Thus, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected to identify whether or not the vehicle is in a high-speed traveling state. When the vehicle is in a high-speed traveling state, for example, the blade overrun is suppressed by narrowing the wiping angle of the wiper blade.

  In the motor control method, when the difference between the accumulated load points of the forward operation and the backward operation of the wiper blade exceeds the threshold value, it is determined that the vehicle is in a high speed traveling state, and the motor drive command unit An instruction to reduce the rotation angle of the electric motor and to narrow the wiping angle of the wiper blade may be issued.

  Another wiper control method of the present invention is a wiper control method applied to a wiper device comprising a wiper blade disposed on a wiping surface and an electric motor for driving the wiper blade, wherein the electric motor A point value corresponding to the load state is detected, a current load state of the electric motor is detected, a load point value of the electric motor is calculated based on the point value from the load state, and the load point Accumulated load points are calculated by accumulating values, the cumulative load point and the first threshold value in the forward operation of the wiper blade, the cumulative load point and the second threshold value in the backward operation of the wiper blade, the forward operation and the return route of the wiper blade The difference between the accumulated load points of the operation and the third threshold value are respectively compared, and based on the comparison result, the driving for the wiper blade is performed. The vehicle identifies whether there the high-speed running state by detecting the influence of wind pressure load due to the wind, based on the identification result, and controls the operation of the electric motor.

  In the present invention, the point value set corresponding to the load state of the motor is classified into the total value of the wiper blade forward operation, the total value of the return operation, and the difference between them, and the operation state of the wiper is determined. Classify more finely. Then, by comparing each value with a predetermined threshold, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected, and whether the vehicle is in a high-speed driving state is identified, and the vehicle is in a high-speed driving state. In such a case, for example, the blade overrun is suppressed by narrowing the wiping angle of the wiper blade.

  In the motor control method, when the cumulative load point in the forward movement operation of the wiper blade is less than the first threshold value and the cumulative load point in the backward movement operation of the wiper blade is equal to or greater than the second threshold value, the wiper blade forward path When the difference between the accumulated load points of the operation and the return path operation is equal to or greater than the third threshold value, it is determined that the vehicle is in a high-speed traveling state, and the rotation angle of the electric motor is determined with respect to the motor drive command unit. An instruction to reduce the wiper blade's wiping angle may be issued. Further, different values may be set as the first to third threshold values depending on whether the operation of the wiper blade is Hi or Lo.

  According to the wiper control device of the present invention, the storage unit that stores the point value set corresponding to the load state of the electric motor, the current load state of the electric motor is detected, and the electric motor's current load state is detected from the load state. A point value calculating unit for calculating a load point value, a point value adding unit for calculating a cumulative load point by accumulating the load point value, a difference between each accumulated load point of the forward operation and the backward operation of the wiper blade, and a predetermined value Based on the comparison result in the point comparison unit that compares the threshold and the point comparison unit, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected, and whether or not the vehicle is in a high-speed traveling state is identified Since the state determination unit and the motor drive command unit that issues an operation command to the electric motor based on the identification result in the wiping state determination unit are provided, the vehicle travels at a high speed. When in the state, in order to suppress the overrun of the blade, for example, it is possible to take appropriate action, such as narrowing the wiping angle of the wiper blade.

  According to another wiper control device of the present invention, a storage unit that stores a point value set corresponding to a load state of the electric motor, a current load state of the electric motor is detected, and the electric load is detected from the load state. A point value calculating unit for calculating a load point value of the motor, a point value adding unit for calculating a cumulative load point by accumulating the load point value, a cumulative load point in the forward operation of the wiper blade, a first threshold value, and a return operation Based on the comparison between the cumulative load point and the second threshold value, the difference between the cumulative load points of the forward movement operation and the backward movement action and the third threshold value, and the comparison result in the point comparison section, depending on the traveling wind for the wiper blade In the wiping state determination unit that detects the influence of the wind pressure load and identifies whether the vehicle is in a high-speed traveling state, and a wiping state determination unit Based on the other result, a motor drive command unit that issues an operation command to the electric motor is provided, so that when the vehicle is in a high-speed running state, for example, the wiper blade wiping angle is set to suppress blade overrun. Appropriate measures such as narrowing can be taken.

  According to the wiper control method of the present invention, the point value corresponding to the load state of the electric motor is set, the current load state of the electric motor is detected, and the load point value of the electric motor is calculated from the load state. The cumulative load point is calculated by accumulating the load point value, and the difference between the cumulative load points of the forward movement and the backward movement of the wiper blade is compared with a predetermined threshold value. By detecting the influence of the wind pressure load caused by the traveling wind and identifying whether or not the vehicle is in a high-speed traveling state, the operation of the electric motor is controlled based on the identification result. In some cases, it is possible to take appropriate measures such as, for example, reducing the wiper blade wiping angle in order to suppress blade overrun.

  According to another wiper control method of the present invention, the point value corresponding to the load state of the electric motor is set, the current load state of the electric motor is detected, and the load point value of the electric motor is calculated from the load state. At the same time, the accumulated load point is calculated by accumulating the load point value, and the accumulated load point and the first threshold value in the forward operation of the wiper blade, the accumulated load point and the second threshold value in the backward operation, and the accumulation of the forward operation and the backward operation, respectively. The difference between the load points and the third threshold value are respectively compared, and based on the comparison result, the influence of the wind pressure load caused by the traveling wind on the wiper blade is detected to identify whether the vehicle is in a high-speed traveling state, Since the operation of the electric motor is controlled on the basis of the identification result, when the vehicle is in a high-speed traveling state, an example is to suppress the blade overrun. If, it is possible to take appropriate action, such as narrowing the wiping angle of the wiper blade.

It is explanatory drawing which shows the structure of the motor unit used for the wiper apparatus driven by the control apparatus and the control method which is Example 1 of this invention. It is explanatory drawing which shows the structure of the motor control system which is Example 1 of this invention. It is a block diagram which shows the structure of the prediction processing system of the driving | running | working wind in CPU applied to the control system of FIG. It is a flowchart of the control processing which is Example 1 of this invention. It is a flowchart of the control processing which is Example 2 of this invention. It is explanatory drawing of a forward / reverse rotation motor.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is an explanatory diagram illustrating a configuration of a motor unit used in a wiper device driven by a control device / control method that is Embodiment 1 of the present invention. The motor unit 1 shown in FIG. 1 is used as a drive source for an automobile wiper device, and is connected to a wiper arm via a link mechanism or the like (not shown). A wiper blade (hereinafter abbreviated as a blade) is attached to the wiper arm, and when the blade reaches the upside down position, the forward / reverse rotation of the motor 2 mounted on the motor unit 1 is switched. As a result, the blade reciprocates on the front glass surface, and water droplets and dust on the glass surface are wiped away.

  The motor unit 1 includes a motor 2 and a gear box 3. The rotation of the motor shaft 4 of the motor 2 is decelerated in the gear box 3 and output to the output shaft 5. The motor shaft 4 is rotatably supported by a bottomed cylindrical yoke 6. An armature core 7 around which a coil is wound and a commutator 8 are attached to the motor shaft 4. A plurality of permanent magnets 9 are fixed to the inner surface of the yoke 6. The commutator 8 is in sliding contact with a power supply brush 10. The rotation speed (speed) of the motor 2 is controlled by the amount of current supplied to the brush 10.

  A case frame 11 of the gear box 3 is attached to the opening side edge of the yoke 6. The tip of the motor shaft 4 protrudes from the yoke 6 and is stored in the case frame 11. A worm 12 is formed at the tip of the motor shaft 4. A worm gear 13 rotatably supported by the case frame 11 is engaged with the worm 12. The worm gear 13 is integrally provided with a first gear 14 having a small diameter on the same axis. A large-diameter second gear 15 is engaged with the first gear 14. An output shaft 5 that is rotatably supported by the case frame 11 is integrally attached to the second gear 15. Although not shown, the motor shaft 4 is formed with another worm adjacent to the worm 12 in the direction opposite to the screw direction. The worm power is transmitted to the second gear 15 by a reduction member similar to the worm gear 13 and the first gear 14.

  The driving force of the motor 2 is output to the output shaft 5 while being decelerated through the worm 12, the worm gear 13, the first gear 14, and the second gear 15. A crank arm (not shown) of a wiper device is attached to the output shaft 5. When the motor 2 is operated, the crank arm is driven via the output shaft 5, and the wiper arm is operated via a link mechanism connected to the crank arm.

  A multi-pole magnetized magnet 16 (hereinafter abbreviated as magnet 16) is attached to the motor shaft 4. On the other hand, a Hall IC 17 is provided in the case frame 11 so as to face the outer peripheral portion of the magnet 16. Two Hall ICs 17 are provided at positions having an angle difference of 90 degrees with respect to the center of the motor shaft 4. In the motor 2, the magnet 16 is magnetized to 6 poles, and when the motor shaft 4 rotates once, a pulse output for 6 cycles is obtained from each Hall IC 17. The two Hall ICs 17 output pulse signals whose phases are shifted by ¼ period.

  Therefore, by detecting the appearance timing of the pulse from the Hall IC 17, the rotation direction of the motor shaft 4 can be determined, and thus the forward / return path of the wiper operation can be determined. Further, the rotational speed of the motor shaft 4 can also be detected from the pulse output cycle of one of the Hall ICs 17. There is a correlation between the rotation speed of the motor shaft 4 and the blade speed based on the reduction ratio and the link operation ratio, and the blade speed can also be calculated from the rotation speed of the motor shaft 4.

  An absolute position detection magnet 18 is attached to the bottom surface of the second gear 15. A printed circuit board 19 is attached to the case frame 11. A Hall IC 20 is disposed on the printed circuit board 19 so as to face the magnet 18. One magnet 18 is provided on the bottom surface of the second gear 15, and faces the Hall IC 20 when the blade comes to the lower inversion position. The second gear 15 is attached with a crank arm as described above, and rotates 180 degrees to reciprocate the blade. When the second gear 15 rotates and the blade comes to the lower reverse position, the Hall IC 20 and the magnet 18 face each other and a pulse signal is output.

  The pulse output from the Hall ICs 17 and 20 is sent to a wiper drive control device (motor control device) 21. FIG. 2 is an explanatory diagram showing the configuration of the control system of the motor 2. A CPU (control unit) 22 of the wiper drive control device 21 is connected to a battery 32 via an ignition switch 31, and the operation mode of the wiper device can be switched by the wiper switch 33. The CPU 22 is connected to the Hall ICs 20 and 17 and recognizes the position of the blade using the pulse output from the Hall IC 20 as an absolute position signal. The pulse signal from the Hall IC 17 is used as a relative position signal of the blade. The CPU 22 recognizes the current position of the blade by counting the number of pulses after the absolute position signal is obtained. Here, the current position of the blade is detected based on the combination of the absolute position signal indicating the downward inversion position from the Hall IC 20 and the number of pulses from the Hall IC 17. In this way, the wiper drive control device 21 recognizes the current position and speed of the blade and controls the motor 2 based on the data.

  The CPU 22 detects the rotation speed of the motor 2 from the motor pulse of the Hall IC 17. The motor 2 is feedback controlled based on the detected rotational speed. The motor 2 is subjected to PWM control, and the CPU 22 appropriately changes the ON time ratio by appropriately turning on and off the applied voltage according to the control condition and the detected rotational speed. That is, the CPU 22 calculates the motor rotation speed based on the motor pulse of the Hall IC 17 and sets the time ratio (Duty) of the PWM control ON period according to the value. Thereby, the applied voltage to the motor 2 is effectively changed, and the rotational speed of the motor 2 is controlled to a desired value. The CPU 22 processes the motor pulse period (Hz) as it is as the rotational speed, but the control may be performed by the rotational speed (rpm) obtained from the pulse period.

  On the other hand, the CPU 22 performs a traveling wind pressure prediction process based on the motor rotational speed and PWM duty calculated and set in this way. In this control process, the load point value is calculated and added from the motor speed and the duty, and the state of the traveling wind is predicted based on the difference between the accumulated total value of the forward point and the total value of the return path. And when the wind pressure by driving | running | working wind is high, ie, when it is assumed that the motor vehicle is drive | working at high speed, the operating angle (blade wiping angle) of a motor is narrowed and overrun is suppressed.

  FIG. 3 is a block diagram illustrating a configuration of a traveling wind prediction processing system in the CPU 22. As shown in FIG. 3, the CPU 22 first has a motor rotation number calculation unit 23 that calculates the rotation number of the motor 2 and a feedback control calculation that calculates a PWM duty value by PID control or the like based on the motor rotation number. A processing unit 24 is provided. A point value calculation unit 25 that calculates a load point value from the calculated motor rotation speed and duty is provided at the subsequent stage of the feedback control calculation processing unit 24. The point value calculation unit 25 accesses a load point map 42 stored in advance in the ROM 41, and calculates a load point value based on the motor speed, Duty, and the like.

  A point voltage correction unit 26 that corrects the calculated load point value based on the battery voltage is provided after the point value calculation unit 25. The ROM 41 stores a voltage correction point map 43 along with the load point map 42 described above. The point voltage correction unit 26 acquires the voltage correction point from the ROM 41, and appropriately adjusts the acquired voltage correction point according to the battery voltage to the load point value calculated by the point value calculation unit 25 to obtain the point value. Perform voltage correction. A point value adding unit 27 is provided following the point voltage correcting unit 26. The point value addition unit 27 calculates the cumulative load point Pt by cumulatively adding the load point values stored in the RAM 45. The calculated cumulative load point Pt is stored in the RAM 45.

  Further, the CPU 22 is provided with a point comparison unit 28 that compares the accumulated load point Pt calculated by the point value addition unit 27 with several reference values stored in the ROM 41. A reference value storage unit 44 is provided in the ROM 41, and the reference value storage unit 44 stores a threshold value regarding the cumulative load point Pt. The point comparison unit 28 compares the accumulated load point Pt with these thresholds as appropriate, and notifies the subsequent wiping state determination unit 29 of the result.

  The wiping state determination unit 29 detects the load condition caused by the current traveling wind, that is, the influence of the traveling wind on the blade operation based on the comparison result between the accumulated load point Pt and each threshold value, and the vehicle enters the high speed traveling state. Identifies whether or not there is. A motor drive command unit 30 that issues an operation command to the motor 2 based on the identification result of the wiping state determination unit 29 is further provided at the subsequent stage of the wiping state determination unit 29.

  In the CPU 22, the following traveling wind pressure prediction process is performed with the wiper switch ON when the wiper is activated. FIG. 4 is a flowchart thereof. As shown in FIG. 4, first, in step S <b> 1, the rotational speed of the motor 2 is detected by the motor rotational speed calculation unit 23. A motor pulse is output from the Hall IC 17 as the motor 2 rotates, and the motor rotation speed calculation unit 23 detects the rotation speed of the motor 2 from this motor pulse. After acquiring the motor rotational speed, the feedback control arithmetic processing unit 24 performs PWM duty value arithmetic processing based on the rotational speed of the motor 2 in step S2.

  After calculating the PWM duty value, the process proceeds to step S3, where the point value calculation unit 25 calculates the load point value from the motor rotation speed and the PWM duty value while referring to the load point map 42. The load point map 42 is formed using the motor rotation speed (Hz) and Duty (%) as parameters, and a high point value is set when the duty is high due to a high load or when the rotation speed is decreasing. . For example, when the duty is 80% and the motor speed (motor pulse) is 250 Hz, “+10” is the load point value. Even when the duty is 80%, it is determined that the load is light when the motor speed is 500 Hz and the load point value is “0”, but when the motor speed is 200 Hz, it is determined that the load is heavy. The value is “+15”. Even when the motor speed is the same 250 Hz, when the duty is 60%, the normal load is judged to be “0”, but when the duty is 100%, the load is judged to be heavy and “+15” is loaded. Point value. On the other hand, when the motor speed is 1000 Hz even when the duty is 80%, it is determined that the load is light and the load point value is “−5”. When the motor is stopped, “−20” is set as the load point value.

  After calculating the load point value in step S3, the process proceeds to step S4, and the point voltage correction unit 26 corrects the load point value according to the battery voltage. For each power supply voltage, the load point map 42 may be formed using the motor rotation speed and duty as parameters, and the load point value including the power supply voltage may be calculated in step S3. In this case, the load point map 42 has a three-dimensional structure in which maps using the motor rotation speed and the duty as parameters are stacked for each power supply voltage, and the point distribution gradually shifts as the power supply voltage changes. . That is, on the basis of 12V, the load point value is set to continuously change between the respective voltages so that the voltage is shifted to the + side as the voltage is increased and is shifted to the − side as the voltage is decreased. For example, when the power supply voltage is 13.5 V, when the duty is 100% and the motor speed is 333 Hz, the load point value is set to “+15” (when it is 12 V and 13 V, “+10” under the same condition).

  After correcting the load point value, the process proceeds to step S5, and the calculated load point value is accumulated. Accumulation of the load point value is performed by the point value adding unit 27, and the calculated accumulated load point Pt is stored in the RAM 45.

  Thus, after calculating, correcting and accumulating the load point value to obtain the accumulated load point Pt, the process proceeds to step S6, and it is determined whether the wiper device is currently in the forward path state or in the return path state. . The forward / return path is determined by determining the rotation direction of the motor shaft 4. As described above, the rotation direction of the motor shaft 4 can be determined based on the appearance timing of the pulse from the Hall IC 17. If it is determined that the path is forward, the process proceeds to step S 7 and subsequent steps. Proceed to

  Therefore, first, a case will be described in which it is determined in step S6 that the wiper device is in the forward path state. In this case, the process proceeds from step S6 to step S7, and it is confirmed whether or not the forward load point addition counter is zero. The forward load point addition counter is a counter indicating the load point value addition status in the forward operation, and is incremented by one each time the load point value is added. Therefore, the forward load point addition counter = 0 is a state in which the load point value is not added once in the forward route, that is, a state where the first forward wiping operation has just been started from the lower inversion position. It means that.

  In S7, if the forward load point addition counter = 0, the process proceeds to step S8, and the forward accumulated load point Ptf obtained by accumulating the forward load point values is set to zero. In step S9, the forward load point addition counter is also set to zero. Further, in step S10, 1 is added to the forward load point addition counter (counter = 1). And it progresses to step S11 and CPU22 implements normal wiping operation | movement control using the target value of a wide wiping angle. In the wiping operation control, in step S12, an angle counter indicating the current position of the blade is incremented by one. After incrementing the angle counter, the process proceeds to step S13, where it is determined whether or not the value of the angle counter has reached a value indicating the upper inversion position. If the value of the angle counter has not reached the value indicating the upper reversal position, the routine is exited, and if it has been reached, it is determined that the blade has reached the upper reversal position, and the process proceeds to step S14 for processing the return path operation. Switch.

  On the other hand, if the forward load point addition counter is not 0 in S7, the process proceeds to step S15, and the current load point value is added to the forward cumulative load point Ptf. After accumulating the current load point value, 1 is added to the forward load point addition counter in step S16. After adding the counter, the process proceeds to step S17, where it is determined whether or not the current wiping operation is the first wiping operation after the wiper switch is turned ON. As described above, in this process, since the state of the traveling wind is predicted based on the difference between the total value of the load point value in the forward path and the total value of the return path, in the case of the first wiping, The data is not available and the round trip difference cannot be determined. Accordingly, in step S17, it is confirmed whether or not the operation is the first wiping operation, and in the case of the first operation, the initial operation processing in steps S18 to S22 is performed.

  In step S18, it is determined whether or not the current blade position (motor shaft angle) has reached a preset operating angle switching determination angle, and if it has reached the switching determination angle, in step S19, The outbound cumulative load point Ptf is compared with a predetermined determination threshold A (SVa). In this case, the operating angle switching determination angle refers to the possibility that the blade may overrun the upper reversal position when the forward accumulated load point Ptf exceeds the determination threshold value SVa when the blade comes to that position. Reference position. That is, for example, when Ptf> SVa at a position where the blade is 60 °, it can be estimated that the vehicle is in a high-speed traveling state, and if the blade is operated as it is, there is a risk of overrun.

  Accordingly, when the point comparison unit 28 determines that Ptf> SVa in step S19, the process proceeds to step S20, and the wiping state determination unit 29 determines that the vehicle is in a high-speed traveling state. In response to this, the motor drive command unit 30 controls the wiper device (motor 2) using the target value of the narrow wiping angle. That is, the rotation angle of the motor shaft 4 is set to be small, the wiping area (wiping angle) of the blade is narrowed, and the upper inversion position is set to the near side from the specified position. Thereby, the reversing operation is performed at a position before the normal upper reversing position. Therefore, even if the blade or the like is bent due to the traveling wind during high-speed traveling, the blade is reversed at a generally normal upper reversal position without causing overrun. After the control with the narrow wiping angle target value is performed, in step S12, the angle counter is incremented, and then the processing in steps S13 and S14 is performed, and the routine is exited.

  On the other hand, in step S18, if the blade has not reached the operating angle switching determination angle, the process proceeds to step S21 to perform normal control until the operating angle switching determination is reached, and a wide wiping angle target value is used. Then, wiping operation control is performed. In step S19, if Ptf ≦ SVa, it is determined that there is no possibility of overrun, and the process proceeds to step S22, and wiping operation control is performed using a wide wiping angle target value. After controlling the wide wiping angle target value in steps S21 and S22, after incrementing the angle counter in step S12, the processing in steps S13 and S14 is performed, and the routine is exited.

  After performing such initial movement processing, in the second and subsequent wiping operations, the process proceeds from step S17 to step S23, and the cumulative load point reciprocal difference Ptd, which is the difference between the forward cumulative load point Ptf and the backward cumulative load point Ptr. Is calculated. In this case, the return accumulated load point Ptr has already been obtained in the processing after step S31 after the first round-trip wiping operation, and the difference Ptd between them is calculated using the calculated value and the current Ptf. Is done. The Ptd calculated in S23 is compared with a predetermined determination threshold B (SVb) in the next step S24. Here, in the windshield wiper device, the blade is pushed up to the upper reversal position side by the traveling wind. Therefore, the higher the traveling speed of the vehicle, the lighter the operating load on the forward path and the heavier the operating load on the return path. Therefore, the difference between the cumulative load points Ptf and Ptr increases as the traveling speed increases, and the possibility of overrun increases as the difference Ptf increases.

  Therefore, in the control theory, the cumulative load point round-trip difference Ptd is compared with a determination threshold value SVb obtained in advance through experiments or the like as a limit value that may cause an overrun (S24). When Ptd ≧ SVb, Proceeding to step S25, the wiper device is controlled using the target value of the narrow wiping angle. That is, by narrowing the wiping angle of the blade and setting the upper reversal position to the near side of the specified position, the wiper prevents the overrun from occurring even if the blade or the like is bent due to the traveling wind during high-speed traveling. Control the device. After the control with the narrow wiping angle target value is performed, in step S12, the angle counter is incremented, and then the processing in steps S13 and S14 is performed, and the routine is exited.

  On the other hand, if Ptf <SVb in S24, the reciprocal difference between the cumulative load points Ptf and Ptr is not so large, so it is determined that there is no possibility of overrun, and the process proceeds to step S26, where wide wiping is performed. Wiping operation control is performed using the target value of the corner. After controlling the wide wiping angle target value in step S26, after the angle counter is incremented in step S12, the processing in steps S13 and S14 is performed, and the routine is exited.

  Next, the control process in the return path after step S31 will be described. If it is determined in step S6 that the wiper device is in the return path state, the process proceeds from step S6 to step S31, and it is confirmed whether or not the return path point addition counter is 0. Similarly to the forward load point addition counter, the return load point addition counter is a counter indicating the load point value addition status in the return path operation, and is incremented by one each time the load point value is added. Therefore, the return load point addition counter = 0 is a situation where the load point value is not added once in the return path, that is, a state where the first return wiping operation has just started from the upper inversion position. It means that.

  If it is determined in S31 that the return load point addition counter = 0, the process proceeds to step S32, and the return accumulated load point Ptr obtained by accumulating the load point values in the return path is set to zero. In step S33, the return point load point addition counter is also set to zero. Further, in step S34, 1 is added to the return load point addition counter (counter = 1). And it progresses to step S35 and normal wiping operation control is implemented using the target value of a wide wiping angle. In the wiping operation control, in step S36, one angle counter indicating the current position of the blade is decremented. After the angle counter is decremented, the process proceeds to step S37, where it is determined whether or not the value of the angle counter has reached a value indicating the lower reverse position. If the value of the angle counter has not reached the value indicating the lower inversion position, the routine is exited, and if it has been reached, it is determined that the blade has come to the lower inversion position, and the process proceeds to step S38 for processing the forward path operation. Switch.

  On the other hand, if the return load point addition counter is not 0 in S31, the process proceeds to step S39, and the current load point value is added to the return accumulated load point Ptr. After accumulating the current load point value, 1 is added to the return load point addition counter in step S40. After adding the counter, the process proceeds to step S35, the normal wiping operation control is performed using the target value of the wide wiping angle, the process from step S36 is performed, and the routine is exited.

  Thus, according to the control process of the present invention, when traveling at high speed, paying attention to the difference Ptd between the accumulated load points Ptf and Ptr on the forward path and the return path, and when Ptd exceeds a predetermined threshold, It is determined that the vehicle is traveling at high speed where overrun may occur. Then, the target value of the wiping angle is set to be narrow so that an overrun does not occur at the upper inversion position due to the bending of the blade or the like during high-speed traveling. That is, the wind pressure load is predicted from the difference between the accumulated load points Ptf and Ptr on the forward path and the return path, and when the wind pressure is high, the operating angle of the motor 2 is narrowed. Thereby, the overrun at the time of high-speed driving | running | working is suppressed and malfunctions, such as a blade colliding with a pillar exceeding a predetermined inversion position, can also be prevented. In addition, it is not necessary to set the wiping angle at the time of normal wiping narrowly in consideration of overrun at high speed traveling, so the wiping angle at the time of normal wiping can be set wide, and a wider field of view can be secured during rainfall. It becomes possible.

  As described above, in the control process of the first embodiment, the wiping angle is appropriately changed based on the accumulated load point reciprocal difference Ptd to suppress overrun during high speed travel. The amount of overrun differs between the surface states of WET and DRY. For this reason, simply changing the wiping angle based on the vehicle speed information results in the wiping angle being too narrow and it is difficult to ensure the reversal position accuracy. Therefore, as Example 2 of the present invention, the accumulated load point values are classified into three: (1) the total value of the forward path, (2) the total value of the return path, and (3) the difference between the two, and the wiping mode. A control process in which the load situation is further classified by combining (Hi / Lo) and the values of (1) to (3) to improve the reversal position accuracy will be described. The control process of the second embodiment is performed by the same motor unit (FIG. 1) and motor control system (FIG. 2) as those of the first embodiment. Accordingly, the same members and portions as those of the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The control processing of the second embodiment is also performed by the prediction processing system of the first embodiment shown in FIG. However, in the control process, the point comparison unit 28 compares the accumulated load points Ptf and Ptr on the forward and return paths and the difference Ptd thereof with a plurality of reference values stored in the ROM 41. The reference value storage 44 in the ROM 41 stores a plurality of threshold values (outward / return / return difference during Hi operation, forward / return / return difference during Lo operation) for each value Ptf, Ptr, Ptd. Yes. The point comparison unit 28 compares the accumulated load points Ptf · Ptr and the difference Ptd with these thresholds as appropriate, and notifies the subsequent wiping state determination unit 29 of the result. The wiping state determination unit 29 determines whether the current wiping state, that is, wiping in the high speed running state, wiping in the WET state, or wiping in the DRY state, based on the comparison result between the cumulative load points Ptf and Ptr and each threshold value. Or identify.

  FIG. 5 is a flowchart of control processing according to the second embodiment of the present invention. As shown in FIG. 5, first, in step S <b> 101, the rotation number of the motor 2 is detected by the motor rotation number calculation unit 23. After obtaining the motor rotation speed, the feedback control calculation processing section 24 performs PWM duty value calculation processing based on the rotation speed of the motor 2 in step S102. After calculating the PWM duty value, the process proceeds to step S103, where the point value calculation unit 25 calculates the load point value from the motor speed and the PWM duty value while referring to the load point map 42.

  After calculating the load point value in step S103, the process proceeds to step S104, and the point voltage correction unit 26 corrects the load point value according to the battery voltage. After correcting the load point value, the process proceeds to step S105, and the calculated load point value is accumulated. The accumulation of the load point values is performed by the point value adding unit 27, and the calculated accumulated load points Ptf and Ptr are stored in the RAM 45.

  Thus, after calculating, correcting and accumulating the load point value to obtain the accumulated load point Ptf · Ptr, the process proceeds to step S106, and the current wiping mode (Hi or Lo) is determined. As described above, in the control process according to the present embodiment, three threshold values are set for the cumulative load points Ptf and Ptr for each of Hi and Lo operation modes (outward / return / reciprocal difference: a total of 6). Has been. After S106, the current wiper operation status is identified by comparison with these threshold values, and the operation of the motor 2 (wiper operation) is appropriately controlled.

Therefore, the current wiping mode is determined in S106, and if the current Hi operation is in progress, the process proceeds to Step S107, and the point comparison unit 28 determines the forward load accumulated load point Ptf and the determination threshold SV1 _{H in the} Hi operation. (First threshold value) are compared (subscripts with subscripts H and L indicate that they are values applied during Hi operation and Lo operation, respectively). In the operation of the blade, in the DRY state, since the resistance with the glass surface is increased, the cumulative load point Ptf is increased as compared with the WET state. Therefore, SV1 _H is set as a threshold for distinguishing the two, and when Ptf is SV1 _H or more, it is determined that the operation is in the DRY state. Then, it progresses to step S108 and the wiping state determination part 29 judges that it is wiping in a DRY state. In the operation in the DRY state, since the blade overrun hardly occurs, the motor drive command unit 30 receives this, performs the wiping operation control using the target value of the wide wiping angle, and exits the routine.

If Ptf is less than SV1 _H is at S107, the process proceeds to step S109, in turn, compares the return of the cumulative load point Ptr, determination threshold SV2 _H a (second threshold value). When Ptr is less than SV2 _H (Ptf <SV1 _H and Ptr <SV2 _H ), it is determined that the wiping state is normal wiping, the process proceeds to step S108, and wiping operation control is performed using a wide wiping angle target value. Exit the routine. On the contrary, if Ptr is equal to or greater than SV2 _H, the process proceeds to step S110, further, compares the reciprocating difference Ptd cumulative load point Ptf · Ptr, determination threshold SV3 _H (third threshold value). If the reciprocal difference of the cumulative load point Pt is less than SV3 _H , the cumulative load point Pt on the return path is large, but it is not in the DRY state and is not in the high speed state or the like. Use to control the wiping operation and exit the routine.

If Ptd is above SV3 _H at S110, the process proceeds to step S111. Ptd ≧ SV3 _H is a DRY state or a high-speed running state, but it is already determined in S107 that it is not in a DRY state (Ptf <SV1 _H ). Therefore, when Ptd ≧ SV3 _H , the wiping state determination unit 29 determines that the vehicle is running at a high speed, and the motor drive command unit 30 receives this and controls the wiper device using the target value of the narrow wiping angle. , Exit the routine. That is, by narrowing the wiping area of the blade and setting the upper reversal position to the near side of the specified position, the wiper prevents the overrun from occurring even if the blade or the like is bent due to traveling wind during high-speed traveling. Control the device.

On the other hand, the current wiping mode is determined in S106, and if the Lo is currently operating, the process proceeds to step S112, and the accumulated load point Ptf in the forward path is compared with the determination threshold value SV1 _L (first threshold value). If Ptf is greater than or equal to SV1 _L , it is determined that the operation is in the DRY state, the process proceeds to step S113, the wiper device is controlled using a wide wiping angle target value, and the routine is exited. If Ptf is less than SV1 _{L in} S112, the process proceeds to step S114, and this time, the cumulative load point Ptr on the return path is compared with the determination threshold SV2 _L (second threshold). When Ptr is less than SV2 _L (Ptf <SV1 _L and Ptr <SV2 _L ), it is determined as normal wiping in the WET state, and the process proceeds to step S113 to perform wiping operation control using a target value of a wide wiping angle. Exit the routine.

On the contrary, if Ptr is equal to or greater than SV2 _L, the process proceeds to step S115, further, compares the reciprocating difference Ptd cumulative load point Ptf · Ptr, determination threshold SV3 _L (third threshold value). If the reciprocal difference Ptd between the cumulative load points Ptf and Ptr is less than SV3 _L , the cumulative load point Ptr on the return path is large, but it is not in the DRY state and is not in the high-speed traveling state. The wiping operation control is performed using the target value and the routine is exited.

If Ptr is greater than or equal to SV3 _{L in} S115, the process proceeds to step S116, and the wiping state determination unit 29 determines that it is in a high-speed traveling state as described above. Then, the motor drive command unit 30 receives this, controls the wiper device using the target value of the narrow wiping angle, and exits the routine. That is, the wiping area of the blade is narrowed, and the wiper device is controlled so that overrun does not occur even if the blade or the like is bent by the traveling wind during high-speed traveling.

It goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention.
For example, in the above-described second embodiment, control is performed with the same wide wiping angle target value in the WET state and the DRY state, but in the WET state, the wiping resistance is smaller than in the DRY state, which is lower than the DRY state. Since a slight overrun is likely to occur, a third target value is set between the target value for the wide wiping angle (first target value) and the target value for the narrow wiping angle (second target value). In this case, the wiper device (motor 2) may be controlled using this third target value. That is, in FIG. 5, if Ptr <SV2H in step S109, or if Ptr <SV2L in step S114, a step of performing the wiping operation control using the third target value may be executed.

  On the other hand, FIG. 6 discloses a motor different from the motor disclosed in FIG. 2, and discloses a forward / reverse rotating motor including an H bridge circuit 34. The present invention is also applicable to such a forward / reverse rotating motor. The CPU 22 and the wiper switch 33 are connected via a communication line 35, and the wiper is controlled according to control information transmitted from the communication line 35. 6 are the same as those in FIG. 2, and the same numbers are used.

  In the above-described embodiment, two Hall ICs are used for the output of the angle sensor. However, it is also possible to use a single absolute position detection sensor such as an MR sensor by providing a magnet only on the worm wheel. In addition, a device using PWM duty or a device using communication may be applied.

DESCRIPTION OF SYMBOLS 1 Motor unit 2 Motor 3 Gear box 4 Motor shaft 5 Output shaft 6 Yoke 7 Armature core 8 Commutator 9 Permanent magnet 10 Brush 11 Case frame 12 Worm 13 Worm gear 14 First gear 15 Second gear 16 Magnet 17 Hall IC
18 Magnet 19 Printed circuit board 20 Hall IC
21 Wiper drive control device 22 CPU
23 motor rotation speed calculation unit 24 motor rotation speed calculation unit 25 point value calculation unit 26 point voltage correction unit 27 point value addition unit 28 point comparison unit 29 wiping state determination unit 30 motor drive command unit 31 ignition switch 32 battery 33 wiper switch 34 H bridge circuit 35 Communication line 41 ROM
42 Load point map 43 Voltage correction point map 44 Reference value storage unit 45 RAM
Pt cumulative load point Ptf forward path cumulative load point Ptr return path cumulative load point Ptd cumulative load point round trip difference SVa determination threshold A
SVb determination threshold B
SV1 _H determination threshold (outward / Hi operation: first threshold)
SV1 _L judgment threshold (during forward / Lo operation: first threshold)
SV2 _H determination threshold value (return / Hi operation: second threshold value)
SV2 _L judgment threshold value (at the time of return trip / Lo operation: second threshold value)
SV3 _H judgment threshold (round trip difference / Hi operation: third threshold)
SV3 _L judgment threshold (round trip difference / Lo operation: 3rd threshold)

Claims (6)

A wiper control device that performs drive control of a wiper device that includes a wiper blade disposed on a wiping surface of a vehicle, and an electric motor that drives the wiper blade,
A storage unit for storing a point value set corresponding to the load state of the electric motor;
A point value calculation unit that detects a current load state of the electric motor and calculates a load point value of the electric motor based on the point value of the storage unit from the load state;
A point value addition unit for accumulating the load point value to calculate a cumulative load point;
A difference between the cumulative load points of the forward operation and the return operation of the wiper blade, and a point comparison unit that compares a predetermined threshold value;
Based on the comparison result in the point comparison unit, a wiping state determination unit that detects an influence of a wind pressure load caused by traveling wind on the wiper blade and identifies whether the vehicle is in a high-speed traveling state;
Based on the identification result in the wiping state determination unit, it has a, a motor drive command unit that performs an operation command to said electric motor,
The wiping state determination unit determines that the vehicle is in a high-speed traveling state when the difference between the accumulated load points of the forward movement operation and the backward movement operation of the wiper blade exceeds the threshold value, to the motor drive command unit An instruction to reduce the rotation angle of the electric motor and to narrow the wiping angle of the wiper blade is provided . A wiper control device that performs drive control of a wiper device that includes a wiper blade disposed on a wiping surface of a vehicle, and an electric motor that drives the wiper blade,
A storage unit for storing a point value set corresponding to the load state of the electric motor;
A point value calculation unit that detects a current load state of the electric motor and calculates a load point value of the electric motor based on the point value of the storage unit from the load state;
A point value addition unit for accumulating the load point value to calculate a cumulative load point;
Cumulative load point and first threshold value in the forward movement of the wiper blade, cumulative load point and second threshold value in the backward movement of the wiper blade, difference between the cumulative load points in the forward movement and backward movement of the wiper blade and a third threshold value A point comparison unit for comparing
Based on the comparison result in the point comparison unit, a wiping state determination unit that detects an influence of a wind pressure load caused by traveling wind on the wiper blade and identifies whether the vehicle is in a high-speed traveling state;
Based on the identification result in the wiping state determination unit, it has a, a motor drive command unit that performs an operation command to said electric motor,
When the cumulative load point in the forward movement of the wiper blade is less than the first threshold and the cumulative load point in the backward movement of the wiper blade is greater than or equal to the second threshold, the wiping state determination unit When the difference between the accumulated load points of the forward operation and the backward operation is equal to or greater than the third threshold value, it is determined that the vehicle is in a high speed traveling state, and the rotation angle of the electric motor is determined with respect to the motor drive command unit. And a wiper control device for instructing to reduce a wiping angle of the wiper blade . 3. The wiper control device according to claim 2 , wherein the first to third threshold values are set to different values depending on whether the operation of the wiper blade is Hi or Lo. A wiper control method applied to a wiper device comprising: a wiper blade disposed on a wiping surface of a vehicle; and an electric motor that drives the wiper blade,
Set a point value corresponding to the load state of the electric motor,
Detecting the current load state of the electric motor, and calculating the load point value of the electric motor based on the point value from the load state,
Accumulating the load point value to calculate the cumulative load point,
The difference between the accumulated load points of the forward movement and the backward movement of the wiper blade is compared with a predetermined threshold value,
When the difference between the accumulated load points of the forward movement and the backward movement of the wiper blade exceeds the threshold value, it is determined that the vehicle is in a high-speed running state, and the electric motor rotates with respect to the motor drive command unit. A wiper control method comprising: instructing to reduce an angle and to narrow a wiping angle of the wiper blade . A wiper control method applied to a wiper device comprising: a wiper blade disposed on a wiping surface of a vehicle; and an electric motor that drives the wiper blade,
Set a point value corresponding to the load state of the electric motor,
Detecting the current load state of the electric motor, and calculating the load point value of the electric motor based on the point value from the load state,
Accumulating the load point value to calculate the cumulative load point,
Cumulative load point and first threshold value in the forward movement of the wiper blade, cumulative load point and second threshold value in the backward movement of the wiper blade, difference between the cumulative load points in the forward movement and backward movement of the wiper blade and a third threshold value Are compared,
When the cumulative load point in the forward movement of the wiper blade is less than the first threshold and the cumulative load point in the backward movement of the wiper blade is greater than or equal to the second threshold, each of the forward movement and the backward movement of the wiper blade When the cumulative load point difference is equal to or greater than the third threshold, it is determined that the vehicle is in a high-speed running state, the rotation angle of the electric motor is reduced with respect to the motor drive command unit, and the wiper blade The wiper control method characterized by performing the instruction | indication which narrows the wiping angle of wiping . 6. The wiper control method according to claim 5 , wherein different values are set as the first to third threshold values depending on whether the operation of the wiper blade is Hi or Lo.

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