A windshield wiper control device and a control method

Abstract

The present invention relates to the technical field of automotive body accessories, and discloses a wiper control device and a control method for controlling the rotation speed of the wiper rod of a wiper, comprising: a sensor for detecting the current rotation position of the wiper rod of the wiper and generating a position signal; a controller respectively connected to the sensor and the wiper, and the controller controls the voltage value of the effective voltage obtained by the reduction motor of the wiper according to the position signal to control the rotation speed of the wiper rod. The present invention avoids that when the wiper rod rotates within the viewing range, the rotation speed is too slow to block the driver's line of sight or distract the driver's attention; and when using a slower rotation speed to sweep across the area outside the viewing range on the windshield, it avoids that when the wiper rod rotates outside the viewing range, the rotation speed is too fast and it is easy to impact the bottom of the windshield.

Description

Technical Field

[0001] The present invention relates to the technical field of automotive body accessories, and particularly to a wiper control device and a control method thereof. Background Art

[0002] A wiper is an important accessory installed on the windshield, and its function is to sweep away rain, snow and dust that obstruct the line of sight on the windshield of the vehicle. Therefore, it plays an important role in driving safety. The existing wiper controls the wiper rod to rotate on the windshield through a motor therein to scrape off rain, snow and dust on the windshield, especially for scraping off rain, snow and dust within the viewing range that is observed by the driver on the windshield.

[0003] However, the inventor has realized that the current wiper rod usually rotates on the windshield at a constant angular velocity, resulting in the same angular velocity of the wiper rod within and outside the viewing range. When the wiper rod rotates within the viewing range, it is easy to obstruct the driver's line of sight or distract the driver's attention due to too slow rotation speed, and when the wiper rod rotates outside the viewing range, it is easy to impact the bottom of the windshield due to too fast rotation speed. Summary of the Invention

[0004] The purpose of the present invention is to provide a wiper control device and a control method thereof, which are used to solve the problems in the prior art that when the wiper rod rotates within the viewing range, it obstructs the driver's line of sight or distracts the driver's attention due to too slow rotation speed, and when the wiper rod rotates outside the viewing range, it is easy to impact the bottom of the windshield due to too fast rotation speed.

[0005] To achieve the above purpose, the present invention provides a wiper control device for controlling the rotation speed of the wiper rod of a wiper, including:

[0006] A sensor for detecting the current rotation position of the wiper rod of the wiper and generating a position signal;

[0007] A controller, which is respectively connected to the sensor and the wiper. The controller controls the voltage value of the effective voltage obtained by the reduction motor of the wiper according to the position signal to control the rotation speed of the wiper rod.

[0008] In the above solution, the sensor is connected to the reduction motor of the wiper to detect the rotation angle of the output shaft of the reduction motor; wherein, the reduction motor is used to be connected to the wiper rod through the output shaft and drive the wiper rod to rotate;

[0009] The sensor detects the rotation angle of the wiper rod by detecting the rotation angle of the output shaft and generates a position signal representing the rotation angle.

[0010] In the above solution, the sensor includes:

[0011] A magnetic ring, which is connected to a gear connected to the output shaft of the reduction motor, and the magnetic ring is coaxially connected to the gear.

[0012] A Hall sensor, which is fixed on the reduction motor and close to the magnetic ring, and the Hall sensor is used to sense the magnetic field formed by a part on the side of the magnetic ring close to the Hall sensor.

[0013] The magnetic ring rotates with the rotation of the gear, causing the magnetic poles of the part on the side of the magnetic ring close to the Hall sensor to change, and the Hall sensor generates a position signal representing the rotation angle of the wiper rod according to the change of the magnetic poles.

[0014] In the above solution, the controller includes:

[0015] A pulse circuit, which is connected to the sensor, and the pulse circuit is used to generate a pulse signal according to the position signal.

[0016] A control circuit, which is connected to the pulse circuit, and the control circuit is used to send the pulse signal to the reduction motor or the battery module of the wiper, so that the reduction motor obtains an effective voltage from the battery module according to the pulse signal, or the battery module outputs an effective voltage to the reduction motor according to the pulse signal.

[0017] In the above solution, the pulse circuit includes:

[0018] A pulse analysis module, which is connected to the sensor, and the pulse analysis module generates pulse information according to the position signal.

[0019] A pulse width modulation circuit, which is connected to the pulse analysis module, and the pulse width modulation circuit generates the pulse signal according to the pulse information.

[0020] In the above solution, it further includes:

[0021] A voltage detection module, which is connected to the battery module of the wiper and is used to detect the output voltage of the battery module.

[0022] A voltage compensation module, which is connected to the pulse width modulation circuit and is used to control the effective voltage output by the battery module to the reduction motor to reach a preset rated value, or control the effective voltage received by the reduction motor from the battery module to reach the rated value.

[0023] In the above solution, it further includes:

[0024] A detection module, which is connected to the reduction motor and is used to detect the execution current generated in the reduction motor, wherein the execution current is the current generated by applying an effective voltage to the reduction motor;

[0025] A diagnosis module, which is connected to the detection module for obtaining the execution current and judging whether the execution current exceeds a preset risk value; if the execution current exceeds the risk value, the diagnosis module is controlled to cut off the connection between the battery module and the reduction motor.

[0026] To achieve the above object, the present invention also provides a wiper control method for controlling the rotation speed of the wiper blade rod, including:

[0027] Start the wiper to make the wiper blade rod rotate;

[0028] Detect the rotation angle of the wiper blade rod through a sensor and generate a position signal representing the rotation angle;

[0029] Adjust the voltage value of the effective voltage obtained by the wiper through the controller according to the position signal to control the rotation speed of the wiper blade rod.

[0030] In the above solution, the adjusting the voltage value of the effective voltage obtained by the wiper through the controller according to the position signal to control the rotation speed of the wiper blade rod includes:

[0031] Generate pulse information corresponding to the position information according to a preset mapping relationship through the pulse analysis module of the controller, generate the pulse signal according to the pulse information by calling the pulse width modulation circuit of the controller, and send the pulse signal to the control circuit of the controller;

[0032] Call the control circuit to output the pulse signal to the reduction motor of the wiper, so that the voltage value of the effective voltage received by the reduction motor corresponds to the voltage of the pulse signal;

[0033] Call the control circuit to output the pulse signal to the battery module of the wiper, so that the voltage value of the effective voltage output by the battery module to the reduction motor corresponds to the voltage of the pulse signal.

[0034] In the above solution, the generating pulse information corresponding to the position information according to a preset mapping relationship through the pulse analysis module of the controller includes:

[0035] Extract the observed position interval and non-observed position interval in the mapping relationship, and identify the numerical relationship between the position information and the observed position interval and the non-observed position interval;

[0036] When the position information is within the observation position range, the pulse analysis module generates pulse information corresponding to the observation position range;

[0037] When the position information is within the non-observation position range, the pulse analysis module generates pulse information corresponding to the non-observation position range.

[0038] A wiper control device and a control method provided by the present invention detect the current rotation position of the wiper rod through the sensor to generate a position signal, and the controller controls the voltage value of the effective voltage obtained by the reduction motor of the wiper through the position signal, so as to control the rotation speed of the wiper rod. In this way, the wiper rod can obtain different rotation speeds when rotating to different positions, so that when the wiper rod rotates within the observation range on the windshield, it can use a faster rotation speed to cross the area within the observation range on the windshield, avoiding the wiper rod from hindering the driver's line of sight or distracting the driver's attention due to too slow a rotation speed when rotating within the observation range; and using a slower rotation speed to cross the area outside the observation range on the windshield, avoiding the wiper rod from easily impacting the bottom of the windshield when rotating outside the observation range due to too fast a rotation speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of Embodiment 1 of the wiper control device of the present invention;

[0040] Figure 2 It is a schematic structural diagram of the positional relationship between the wiper rod, the windshield and the observation range in Embodiment 1 of the wiper control method of the present invention;

[0041] Figure 3 It is a numerical relationship diagram between the area where the magnetic ring is close to the Hall sensor and the voltage value of the effective voltage in Embodiment 1 of the wiper control device of the present invention;

[0042] Figure 4 It is a flowchart of the wiper control method in Embodiment 2 of the present invention.

[0043] Reference Signs:

[0044] 1, Wiper; 2, Sensor; 3, Controller; 4, Windshield; 5, Observation Range

[0045] 6, Voltage Detection Module; 7, Voltage Compensation Module; 8, Detection Module; 9, Diagnosis Module

[0046] A, Area within the Observation Range; B, Area outside the Observation Range

[0047] 11, Wiper Rod; 12, Reduction Motor; 13, Gear; 14, Output Shaft; 15, Battery Module

[0048] 21. Hall sensor 22. Magnetic ring 31. Pulse circuit 32. Control circuit

[0049] 311. Pulse analysis module 312. Pulse width modulation circuit 321. First interface 322. Second interface Specific implementation mode

[0050] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0051] The following embodiments are now provided:

[0052] Embodiment 1:

[0053] Please refer to Figures 1-3 , a wiper control device of this embodiment, which is used to control the rotation speed of the wiper rod 11 of the wiper 1, includes:

[0054] A sensor 2, which is used to detect the current rotation position of the wiper rod 11 of the wiper 1 and generate a position signal;

[0055] A controller 3, which is respectively connected to the sensor 2 and the wiper 1. The controller 3 controls the voltage value of the effective voltage obtained by the reduction motor 12 of the wiper 1 according to the position signal, so as to control the rotation speed of the wiper rod 11.

[0056] The working principle of the above technical solution is as follows: By detecting the current rotation position of the wiper rod 11 through the sensor 2 and generating a position signal, and by controlling the voltage value of the effective voltage obtained by the reduction motor 12 of the wiper 1 according to the position signal through the controller 3, so as to control the rotation speed of the wiper rod 11, the wiper rod 11 can obtain different rotation speeds when rotating to different positions, so that when the wiper rod 11 rotates within the viewing range 5 on the windshield 4, it can use a faster rotation speed to cross the area A within the viewing range on the windshield 4, avoiding that when the wiper rod 11 rotates within the viewing range 5, the driving vision is blocked or the driver's attention is distracted due to too slow a rotation speed; and use a slower rotation speed to cross the area B outside the viewing range on the windshield 4, avoiding that when the wiper rod 11 rotates outside the viewing range 5, the bottom of the windshield 4 is easily impacted due to too fast a rotation speed.

[0057] In a preferred embodiment, the sensor 2 is connected to the reduction motor 12 of the windshield wiper 1 to detect the rotation angle of the output shaft 14 of the reduction motor 12; wherein, the reduction motor 12 is used to connect to the wiper rod 11 through the output shaft 14 and drive the wiper rod 11 to rotate;

[0058] By detecting the rotation angle of the output shaft 14, the sensor 2 detects the rotation angle of the wiper rod 11 and generates a position signal representing the rotation angle.

[0059] Preferably, the sensor 2 includes:

[0060] A magnetic ring 22, which is connected to the gear 13 connected to the output shaft 14 of the reduction motor, and the magnetic ring 22 is coaxially connected to the gear 13; wherein, the output shaft 14 is connected to the wiper rod 11 to drive the wiper rod 11 to rotate.

[0061] A Hall sensor 21, which is fixed on the reduction motor 12 and close to the magnetic ring. The Hall sensor 21 is used to sense the magnetic field formed by a part area on the side of the magnetic ring 22 close to the Hall sensor; wherein, the Hall sensor 21 is a magnetic field sensor 2 made according to the Hall effect.

[0062] As the magnetic ring 22 rotates with the rotation of the gear 13, the magnetic poles of the part area on the side of the magnetic ring 22 close to the Hall sensor 21 change, and the Hall sensor 21 generates a position signal representing the rotation angle of the wiper rod 11 according to the change of the magnetic poles.

[0063] Specifically, the reduction motor 12 rotates the output shaft 14 by rotating the gear 13 and drives the magnetic ring 22 connected to the gear 13 to rotate. At this time, the wiper rod 11 will rotate with the rotation of the output shaft 14; the magnetic ring 22 changes the magnetic field around the gear 13 due to rotation, and the Hall sensor 21 generates a position signal representing the rotation angle of the output shaft 14 according to the changed magnetic field. The magnetic ring 22 is fixed on the reduction gear 13, and the Hall sensor 21 is fixed on the stator housing. When the motor rotates to different positions, the Hall sensor 21 will emit different signals, and the movement position of the motor is judged through the Hall signal, so as to control the motor speed.

[0064] Preferably, the magnetic ring 22 is a multi-stage magnet, which has at least one N pole and at least one S pole, so that when the magnetic ring 22 rotates, due to the change between the N pole and the S pole, the Hall sensor 21 generates a position signal due to the change.

[0065] In this embodiment, the magnetic ring 22 has three parts area that can be close to the Hall sensor 21, such as Figure 1 and Figure 2As shown, the said part area includes an a part and two b parts. Among them, the a part corresponds to area A within the observation range of the wiper rod 11, and the two b parts located on both sides of the a part respectively correspond to area B outside the observation range of the wiper rod 11. Exemplarily, when the part area on the side where the Hall sensor 21 senses the magnetic ring 22 approaching the Hall sensor 21 changes from the b part to the a part, that is, when it senses that the magnetic field changes from the S pole to the N pole, it indicates that the wiper rod enters area A within the observation range from area B outside the observation range, and the Hall sensor 21 will generate a position signal representing area A within the observation range; when the Hall sensor 21 senses that the part area on the side where the magnetic ring 22 approaches the Hall sensor 21 changes from the a part to the b part, that is, when it senses that the magnetic field changes from the N pole to the S pole, it indicates that the wiper rod enters area B outside the observation range from area A within the observation range, and the Hall sensor 21 will generate a position signal representing area B outside the observation range.

[0066] Furthermore, the magnetic ring 22 is any one of an annular structure, a C-shaped structure, a V-shaped structure, and an L-shaped structure, so that when the magnetic ring 22 rotates with the gear 13, it can bring obvious changes to the magnetic field around the gear 13, thereby ensuring the accuracy of the Hall sensor 21 in identifying the rotation angle of the wiper rod 11.

[0067] In this embodiment, the Hall angle sensor 2 is used as the Hall sensor 21. The Hall angle sensor 2 utilizes the angle change to locate the position of an object, thereby achieving the technical effect of measuring the rotation angle of the output shaft 14 of the reduction motor 12.

[0068] Exemplarily, the Hall principle non-contact angle sensor 2 can be used as the Hall sensor 21. It adopts a high-performance integrated magnetic sensitive element, utilizes the non-contact characteristic of magnetic signal induction, and is combined with a micro-processor for intelligent signal processing to make a new type of 360° full range (90°, 180° clockwise or counterclockwise can be customized) and programmable selected measurement interval angle sensor 2.

[0069] In a preferred embodiment, the controller 3 includes:

[0070] A pulse circuit 31, which is connected to the sensor 2, and the pulse circuit 31 is used to generate a pulse signal according to the position signal.

[0071] Specifically, the current rotation position of the wiper rod 11 is identified through the position signal, and it is judged whether this rotation position is within the driver's observation area;

[0072] If so, a pulse signal for accelerating the rotation speed of the wiper rod 11 is generated;

[0073] If not, a pulse signal for slowing down the rotation speed of the wiper rod 11 is generated.

[0074] Exemplarily, when it is sensed that the magnetic field changes from the S pole to the N pole, it indicates that the wiper rod moves from Figure 1 area B outside the observation range to area A within the observation range. At this time, the Hall sensor 21 will generate a position signal representing the rotation angle of the wiper rod 11 entering the observation range 5 due to the change of the magnetic field from the S pole to the N pole. The pulse circuit 31 will, according to the position signal, continuously generate a pulse signal for accelerating the rotation speed when the Hall sensor 21 is close to the N pole area (i.e., Figure 1 part a in Figure 3 ), and the pulse signal for accelerating the rotation speed corresponds to

[0075] an effective voltage with a first voltage value U1 in Figure 1 When it is sensed that the magnetic field changes from the N pole to the S pole, it indicates that the wiper rod moves from Figure 1 area A within the observation range to area B outside the observation range. At this time, the Hall sensor 21 will generate a position signal representing the rotation angle of the wiper rod 11 leaving the observation range 5 due to the change of the magnetic field from the N pole to the S pole. The pulse circuit 31 will, according to this position signal, continuously generate a pulse signal for slowing down the rotation speed when the Hall sensor 21 is close to the S pole area (i.e., Figure 3 part b in

[0076] A control circuit 32, which is connected to the pulse circuit 31. The control circuit 32 is used to send the pulse signal to the reduction motor 12 or the battery module 15 of the wiper 1, so that the reduction motor 12 obtains the effective voltage from the battery module 15 according to the pulse signal, or the battery module 15 outputs the effective voltage to the reduction motor 12 according to the pulse signal.

[0077] Specifically, call the first interface 321 in the control circuit 32, where the first port is connected to the motor control port of the reduction motor 12; send a pulse signal to the reduction motor 12 through the first interface 321, so that the reduction motor 12 obtains an effective voltage with a voltage value corresponding to the voltage intensity of the pulse signal from the battery module 15 of the wiper; or

[0078] Call the second interface 322 in the control circuit 32, where the first port is connected to the battery output control port of the battery module 15; send a pulse signal to the battery module 15 through the second interface 322, so that the battery module 15 of the wiper outputs an effective voltage corresponding to the voltage intensity of the pulse signal to the reduction motor 12.

[0079] In a preferred embodiment, the pulse circuit 31 includes:

[0080] A pulse analysis module 311, which is connected to the sensor 2, and the pulse analysis module 311 generates pulse information according to the position signal;

[0081] Specifically, the pulse analysis module 311 of the controller 3 generates pulse information corresponding to the position information according to a preset mapping relationship, and calls the pulse width modulation circuit 312 of the controller 3 to generate a pulse signal according to the pulse information, and sends the pulse signal to the control circuit 32 of the controller 3; wherein, the mapping relationship includes an observed position interval and a non-observed position interval:

[0082] The observed position interval represents a part within the observation area, and the upper limit value and the lower limit value of the observed position interval respectively represent both sides of the observation area;

[0083] The non-observed position interval represents a part outside the observation area, and the non-observed position interval includes a first interval and a second interval. The upper limit value of the first interval is one side of the observation area, the lower limit value of the first interval is the bottom position of the windshield 4, the lower limit value of the second interval is the side of the observation area far from the first interval, and the lower limit value of the second interval is the rotation limit position of the reduction motor 12 that rotates the wiper 1.

[0084] A pulse width modulation circuit 312, which is connected to the pulse analysis module 311, and the pulse width modulation circuit 312 generates a pulse signal according to the pulse information.

[0085] Specifically, call the control circuit 32 to output a pulse signal to the reduction motor 12 of the wiper 1, so that the voltage value of the effective voltage received by the reduction motor 12 corresponds to the voltage of the pulse signal; or

[0086] Call the control circuit 32 to output a pulse signal to the battery module 15 of the wiper 1, so that the voltage value of the effective voltage output by the battery module 15 to the reduction motor 12 corresponds to the voltage of the pulse signal.

[0087] It should be noted that the pulse width modulation circuit 312 is a circuit module constructed based on pulse width modulation technology. Pulse width modulation is an analog control method that modulates the bias of the base of a transistor or the gate of a MOS transistor according to the change of the corresponding load to change the conduction time of the transistor or MOS transistor, thereby realizing the change of the output of the switching regulated power supply. This method can keep the output voltage of the power supply constant when the working conditions change, and is a very effective technology for controlling an analog circuit using the digital signal of a microprocessor.

[0088] Preferably, the wiper control device further includes:

[0089] A voltage detection module 6, which is connected to the battery module of the wiper to detect the output voltage of the battery module;

[0090] A voltage compensation module 7, which is connected to the pulse width modulation circuit, is used to control the effective voltage output by the battery module to the reduction motor to reach a preset rated value, or to control the effective voltage received by the reduction motor from the battery module to reach the rated value.

[0091] Specifically, the voltage compensation module 7 adjusts the execution duty cycle of the pulse signal by controlling the pulse width modulation circuit 312 to ensure that the effective voltage received by the reduction motor is stabilized at a first voltage value U1 and / or a second voltage value U2.

[0092] Exemplarily, if the output voltage of the battery module is 20V, the first voltage value U1 is 10V, and the second voltage value U2 is 5V. At this time, the execution duty cycle of the pulse signal corresponding to the first voltage value U1 is 50%, and the execution duty cycle of the pulse signal corresponding to the second voltage value U2 is 25%.

[0093] If the output voltage of the battery module is 10V, the first voltage value U1 is 10V, and the second voltage value U2 is 5V. At this time, the voltage compensation module 7 will adjust the execution duty cycle of the pulse width modulation circuit, that is: the execution duty cycle of the pulse signal corresponding to the first voltage value U1 is 100% to ensure that the effective voltage received by the reduction motor is 10V, and the execution duty cycle of the pulse signal corresponding to the second voltage value U2 is adjusted to 50% to ensure that the effective voltage received by the reduction motor is 5V.

[0094] Preferably, the wiper control device further includes:

[0095] A detection module 8, which is connected to the reduction motor 12, is used to detect the execution current generated in the reduction motor 12, where the execution current is the current generated due to the application of the effective voltage on the reduction motor.

[0096] A diagnosis module 9, which is connected to the detection module 8, is used to obtain the execution current and determine whether the execution current exceeds a preset risk value; if the execution current exceeds the risk value, the diagnosis module 9 is controlled to cut off the connection between the battery module 15 and the reduction motor 12 to ensure the safety of the reduction motor.

[0097] In this embodiment, the diagnosis module 9 timely discovers the locked-rotor current in the reduction motor, thereby avoiding the occurrence of the locked-rotor situation of the reduction motor to ensure the safety and service life of the reduction motor and the battery module.

[0098] Embodiment 2:

[0099] Please refer to Figures 1-4 , a wiper control method of this embodiment, which is used to control the rotation speed of the wiper rod 11 of the wiper 1, includes:

[0100] S101: Start the windshield wiper 1 to rotate the wiper lever 11;

[0101] S102: Detect the rotation angle of the wiper lever 11 through the sensor 2 and generate a position signal representing the rotation angle;

[0102] S103: Adjust the voltage value of the effective voltage obtained by the windshield wiper 1 according to the position signal through the controller 3 to control the rotation speed of the wiper lever 11.

[0103] In a preferred embodiment, adjusting the voltage value of the effective voltage obtained by the windshield wiper 1 according to the position signal through the controller 3 to control the rotation speed of the wiper lever 11 includes:

[0104] S31: Generate pulse information corresponding to the position information according to the preset mapping relationship through the pulse analysis module 311 of the controller 3, generate a pulse signal according to the pulse information by calling the pulse width modulation circuit 312 of the controller 3, and send the pulse signal to the control circuit 32 of the controller 3;

[0105] S32: Call the control circuit 32 to output a pulse signal to the reduction motor 12 of the windshield wiper 1, so that the voltage value of the effective voltage received by the reduction motor 12 corresponds to the voltage of the pulse signal;

[0106] S33: Call the control circuit 32 to output a pulse signal to the battery module 15 of the windshield wiper 1, so that the voltage value of the effective voltage output by the battery module 15 to the reduction motor 12 corresponds to the voltage of the pulse signal.

[0107] Preferably, generating pulse information corresponding to the position information according to the preset mapping relationship through the pulse analysis module 311 of the controller 3 includes:

[0108] S311: Extract the observed position interval and non-observed position interval in the mapping relationship, and identify the numerical relationship between the position information and the observed position interval and non-observed position interval;

[0109] S312: When the position information is within the observed position interval, the pulse analysis module 311 generates pulse information corresponding to the observed position interval;

[0110] S313: When the position information is in the non-observed position interval, the pulse analysis module 311 generates pulse information corresponding to the non-observed position interval.

[0111] Further, generating a pulse signal according to the pulse information by calling the pulse width modulation circuit 312 of the controller 3 and sending the pulse signal to the control circuit 32 of the controller 3 includes:

[0112] S314: Call the pre-set position mapping table, generate a first voltage value U1 according to the pulse information corresponding to the observed position interval, or generate a second voltage value U2 according to the pulse information corresponding to the non-observed position interval;

[0113] S315: Call the pulse width modulation circuit 312 to generate a pulse signal with a voltage intensity of the first voltage value U1 or the second voltage value U2.

[0114] In this embodiment, the pulse width modulation module identifies the current rotation position of the wiper lever 11 through the position signal, and determines whether this rotation position is in the driver's observation area;

[0115] If so, generate a first voltage value U1, and generate a pulse signal corresponding to the first voltage value U1 through the pulse width modulation module, so as to make the wiper lever 11 rotate at full speed, so as to achieve the technical effect of accelerating the rotation speed of the wiper lever 11;

[0116] If not, generate a second voltage value U2, and generate a pulse signal corresponding to the second voltage value U2 through the pulse width modulation module, so as to make the wiper lever 11 rotate at a reduced speed, so as to achieve the technical effect of slowing down the rotation speed of the wiper lever 11;

[0117] Among them, the first voltage value U1 is greater than the second voltage value U2.

[0118] Specifically, calling the control circuit 32 to output a pulse signal to the reduction motor 12 of the wiper 1 includes:

[0119] S311: Call the first interface 321 connected to the reduction motor 12 in the control circuit 32, where the first port is connected to the motor control port of the reduction motor 12;

[0120] S312: Send a pulse signal to the reduction motor 12 through the first interface 321, so that the reduction motor 12 obtains an effective voltage from the battery module 15 of the wiper, and the voltage value of the effective voltage corresponds to the voltage intensity of the pulse signal;

[0121] In this embodiment, the mapping relationship between the voltage value of the pulse signal and the voltage value of the effective voltage is defined through a pre-set current-voltage mapping table;

[0122] Obtain the corresponding voltage value from the current-voltage mapping table according to the voltage intensity of the received pulse signal, and set the obtained voltage value as the target value. Control the reduction motor 12 through the first interface 321 to obtain the effective voltage with the voltage value being the target value from the battery module 15. Among them, when the target value is the first voltage value U1, control the reduction motor 12 through the first interface 321 to obtain the effective voltage with the voltage value being the first voltage value U1 from the battery module 15. When the target value is the second voltage value U2, control the reduction motor 12 through the second interface 322 to obtain the effective voltage with the voltage value being the second voltage value U2 from the battery module 15. The first voltage value U1 is greater than the second voltage value U2.

[0123] The control circuit 32 is called to output a pulse signal to the battery module 15 of the windshield wiper 1, including:

[0124] S331: Call the second interface 322 in the control circuit 32 that is connected to the battery module 15, where the first port is connected to the battery output control port of the battery module 15.

[0125] S332: Send a pulse signal to the battery module 15 through the second interface 322, so that the battery module 15 of the windshield wiper outputs an effective voltage whose voltage value corresponds to the voltage intensity of the pulse signal to the reduction motor 12.

[0126] In this embodiment, the mapping relationship between the voltage value of the pulse signal and the voltage value of the effective voltage is defined by a preset current-voltage mapping table.

[0127] Obtain the corresponding voltage value from the current-voltage mapping table according to the voltage value of the received pulse signal, and set the obtained voltage value as the target value. Control the battery module 15 to output an effective voltage with the voltage value being the target value to the reduction motor 12 through the second interface 322. Among them, when the target value is the first voltage value U1, control the battery module 15 to output an effective voltage with the voltage value being the first voltage value U1 to the reduction motor 12 through the second interface 322. When the target value is the second voltage value U2, control the battery module 15 to output an effective voltage with the voltage value being the second voltage value U2 to the reduction motor 12 through the second interface 322. The first voltage value U1 is greater than the second voltage value U2.

[0128] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0129] Through the description of the above embodiments, those skilled in the art can clearly understand that the above embodiment methods can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method.

[0130] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A wiper control device for controlling the rotation speed of the wiper rod of a wiper, characterized in that, Comprising: A sensor for detecting the current rotational position of the wiper rod of a windshield wiper and generating a position signal; A controller respectively connected to the sensor and the windshield wiper, the controller controlling the voltage value of the effective voltage obtained by the reduction motor of the windshield wiper according to the position signal to control the rotational speed of the wiper rod; The controller includes: A pulse circuit connected to the sensor, the pulse circuit for generating a pulse signal according to the position signal; wherein, the current rotational position of the wiper rod is identified through the position signal to determine whether the rotational position is in the driver's observation area; if so, a pulse signal for accelerating the rotational speed of the wiper rod is generated; if not, a pulse signal for slowing down the rotational speed of the wiper rod is generated; the pulse circuit includes: a pulse analysis module connected to the sensor, the pulse analysis module generating pulse information according to the position signal; a pulse width modulation circuit connected to the pulse analysis module, the pulse width modulation circuit generating the pulse signal according to the pulse information; A control circuit connected to the pulse circuit, the control circuit for sending the pulse signal to the reduction motor or the battery module of the windshield wiper, enabling the reduction motor to obtain an effective voltage from the battery module according to the pulse signal, or enabling the battery module to output an effective voltage to the reduction motor according to the pulse signal; wherein, the first interface connected to the reduction motor in the control circuit is called, wherein the first interface is connected to the motor control port of the reduction motor; a pulse signal is sent to the reduction motor through the first interface, enabling the reduction motor to obtain an effective voltage corresponding to the voltage intensity of the pulse signal from the battery module of the windshield wiper; or the second interface connected to the battery module in the control circuit is called, wherein the second interface is connected to the battery output control port of the battery module; a pulse signal is sent to the battery module through the second interface, enabling the battery module of the windshield wiper to output an effective voltage corresponding to the voltage intensity of the pulse signal to the reduction motor.

2. The wiper control device according to claim 1, characterized in that, The sensor is connected to the reduction motor of the windshield wiper for detecting the rotational angle of the output shaft of the reduction motor; wherein, the reduction motor is used to drive the wiper rod to rotate through the output shaft; The sensor detects the rotational angle of the wiper rod by detecting the rotational angle of the output shaft and generates a position signal representing the rotational angle.

3. The windshield wiper control device according to claim 1, characterized in that The sensor includes: A magnetic ring connected to the gear connected to the output shaft of the reduction motor, the magnetic ring being coaxially connected to the gear, A Hall sensor fixed on the reduction motor and close to the magnetic ring, the Hall sensor for sensing the magnetic field formed by the part of the magnetic ring close to the Hall sensor on one side; The magnetic ring rotates with the rotation of the gear, causing the magnetic poles of the part of the magnetic ring close to the Hall sensor on one side to change, and the Hall sensor generates a position signal representing the rotational angle of the wiper rod according to the change of the magnetic poles.

4. The windshield wiper control device according to claim 1, characterized in that, Also included: A voltage detection module, which is connected to the battery module of the wiper, for detecting the output voltage of the battery module; A voltage compensation module, which is connected to the pulse width modulation circuit, for controlling the effective voltage output by the battery module to the reduction motor to reach a preset rated value, or for controlling the effective voltage received by the reduction motor from the battery module to reach the rated value.

5. The wiper control device according to claim 1, characterized in that, It further includes: A detection module, which is connected to the reduction motor, for detecting the execution current generated in the reduction motor, where the execution current is the current generated by applying the effective voltage to the reduction motor; A diagnosis module, which is connected to the detection module for obtaining the execution current and judging whether the execution current exceeds a preset risk value; if the execution current exceeds the risk value, controlling the diagnosis module to cut off the connection between the battery module and the reduction motor.

6. A windshield wiper control method for controlling the rotation speed of the wiper rod of a windshield wiper, characterized in that, Using the wiper control device according to any one of claims 1-5, the wiper control method includes: Starting the wiper to make the wiper rod rotate; Detecting the rotation angle of the wiper rod through a sensor and generating a position signal representing the rotation angle; Adjusting the voltage value of the effective voltage obtained by the wiper through a controller according to the position signal to control the rotation speed of the wiper rod.

7. The windshield wiper control method according to claim 6, characterized in that, The adjusting the voltage value of the effective voltage obtained by the wiper through a controller according to the position signal to control the rotation speed of the wiper rod includes: Generating pulse information corresponding to the position signal according to a preset mapping relationship through the pulse analysis module of the controller, generating the pulse signal according to the pulse information by calling the pulse width modulation circuit of the controller, and sending the pulse signal to the control circuit of the controller; Calling the control circuit to output the pulse signal to the reduction motor of the wiper, so that the voltage value of the effective voltage received by the reduction motor corresponds to the voltage of the pulse signal; Calling the control circuit to output the pulse signal to the battery module of the wiper, so that the voltage value of the effective voltage output by the battery module to the reduction motor corresponds to the voltage of the pulse signal.

8. The windshield wiper control method according to claim 7, characterized in that, The generating pulse information corresponding to the position signal according to a preset mapping relationship through the pulse analysis module of the controller includes: Extracting the observed position interval and the non-observed position interval in the mapping relationship, and identifying the numerical relationship between the position signal and the observed position interval and the non-observed position interval; When the position signal is within the observed position interval, the pulse analysis module generates pulse information corresponding to the observed position interval; When the position signal is within the non-observed position interval, the pulse analysis module generates pulse information corresponding to the non-observed position interval.

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