Water spray control system for automobile windshield wipers

Abstract

A water spray control system for a car water spray wiper comprises a wiper motor, a washing pump, a first contact, a second contact, and a third contact. An insulating disk is fixed circumferentially on the motor shaft of the wiper motor, a conductive plate is provided on the insulating disk, the conductive plate is in the shape of an arc with the same center as the insulating disk, the central angle of the conductive plate is less than or equal to 180°, the front end of the conductive plate contacts the first contact, the second contact, and the third contact, and also comprises a body controller and a relay. One end of the washing pump is electrically connected to the moving contact of the relay, the other end of the washing pump is electrically connected to the negative pole of the body power supply, the first static contact of the relay is connected to a common ground, the second static contact of the relay and the power supply end are electrically connected to the positive pole of the body power supply, the signal control end of the relay is electrically connected to the control signal output end of the body controller, the first contact is electrically connected to the reset signal end of the body controller, the second contact is electrically connected to the negative pole of the body power supply, and the third contact is electrically connected to the control signal input end of the body controller.

Description

Technical Field

[0001] The invention relates to the technical field of automobile water spray wipers, and in particular to a water spray control system of an automobile water spray wiper. Background Art

[0002] A windshield wiper is a device used to scrape off raindrops and dust on a vehicle's windshield to improve the driver's driving vision and ensure driving safety. As a type of windshield wiper, a water-spraying wiper can spray water onto the corresponding position of the windshield as the wiper moves, resulting in a better cleaning effect. The applicant submitted an invention patent application with application number CN201910012034.5 on January 7, 2019. Figure 2 As shown in the figure, the water spraying method of this technology is to spray water upward when the wiper moves upward, and spray water downward when the wiper moves downward. This method of spraying water when the wiper moves up and down will cause too much water on the windshield, which is easy to affect the driver's vision and is not conducive to safe driving. In addition, this structure is relatively complex and requires significant changes to the car body. In actual application, it is costly and has low practicality. On this basis, the applicant submitted a utility model patent application with application number 201920850197.6 on June 6, 2019. Figure 3 As shown, the water-spraying wiper disclosed in the patent application is mechanically connected, the washing pump is directly connected to the positive pole of the vehicle body power supply through the shift switch, and the three contacts on the conductive plate are respectively connected to the vehicle body power supply. When in use, the washing pump working circuit is turned on and off by operating the washing shift switch, so as to achieve the purpose of water spraying and washing. However, when the washing pump is started under this control mode, a large current passes through the circuit formed by each contact and the conductive plate, so that electric sparks are easily generated when the contact leaves the conductive plate, so that the conductive plate is burned by the electric sparks to form pits, which affects the control reliability of the washing pump and the cleaning effect of the water-spraying wiper, and shortens the service life of the water-spraying wiper. Summary of the invention

[0003] The purpose of the present invention is to provide a water spray control system for a car water spray wiper in view of the deficiencies in the prior art. The water spray control system has a simple structure and no large current passes through the conductive plate when the washing pump is started, which can prevent the conductive plate from being burned by the large current, thereby ensuring the control reliability of the washing pump and extending its service life.

[0004] The technical solution of the present invention is: a water spray control system for a car water spray wiper, comprising a wiper motor, a washing pump, a first contact, a second contact, and a third contact, an insulating disk is fixed circumferentially on the motor shaft of the wiper motor, a conductive plate is provided on the insulating disk, the conductive plate is in the shape of an arc with the same center as the insulating disk, the central angle of the conductive plate is less than or equal to 180°, the front end of the conductive plate is in contact with the first contact, the second contact, and the third contact, and also includes a body controller and a relay, one end of the washing pump is electrically connected to the moving contact of the relay, the other end of the washing pump is electrically connected to the negative pole of the body power supply, the first static contact of the relay is connected to the common ground, The second static contact and the power supply end of the relay are electrically connected to the positive pole of the vehicle body power supply, the signal control end of the relay is electrically connected to the control signal output end of the vehicle body controller, the first contact is electrically connected to the reset signal end of the vehicle body controller, the second contact is electrically connected to the negative pole of the vehicle body power supply, and the third contact is electrically connected to the control signal input end of the vehicle body controller. The conductive plate includes three conductive arc segments, and the three conductive arc segments correspond to the first contact, the second contact, and the third contact, respectively, wherein the arc length of the conductive arc segment corresponding to the reset signal end of the vehicle body controller is less than the arc lengths of the other two conductive arc segments, and the arc lengths of the other two conductive arc segments are the same.

[0005] The third contact sends a high-level control signal or a low-level control signal to the vehicle body controller, and the vehicle body controller sets a filtering time of 30-40ms for the rising edge and the falling edge of the low-level control signal respectively.

[0006] The power supply end and the second static contact of the relay are connected to the positive pole of the vehicle body power supply via a fuse.

[0007] The arrangement positions of the three conductive arc segments of the conductive plate can be interchanged, and the arrangement positions of the first contact, the second contact and the third contact are changed accordingly with the arrangement positions of the conductive arc segments.

[0008] The above technical solution is adopted: an insulating disk is fixed circumferentially on the motor shaft of the wiper motor, and a conductive plate is provided on the insulating disk, that is, when the wiper motor is running, the insulating disk and the conductive plate will rotate with the motor shaft. The front end of the conductive plate contacts the first contact, the second contact, and the third contact, one end of the washing pump is electrically connected to the moving contact of the relay, the other end of the washing pump is electrically connected to the negative pole of the vehicle body power supply, the first static contact of the relay is connected to the common ground, the second static contact and the power supply end of the relay are electrically connected to the positive pole of the vehicle body power supply, the signal control end of the relay is electrically connected to the control signal output end of the vehicle body controller, the first contact is electrically connected to the reset signal end of the vehicle body controller, the second contact is electrically connected to the negative pole of the vehicle body power supply, and the third contact is electrically connected to the control signal input end of the vehicle body controller. When the second contact and the third contact are both in contact with the conductive plate, the vehicle body controller sends a control signal to the relay, so that the moving contact of the relay is attracted to the second static contact, and the washing pump is powered on and operated. When the third contact is separated from the conductive plate, the moving contact of the relay is attracted to the first static contact through the vehicle body controller, so that the washing pump is powered off and stopped. When in use, close the washing shift switch on the car, at which time the first contact, the second contact, and the third contact are all in contact with the conductive plate, and the three contacts are all located at the front end of the rotation direction of the guide plate. The moving contact of the relay controlled by the body controller is attracted to the second static contact, and the washing pump is powered on to spray water on the car windshield. At the same time, the wiper rotates upward, and the upward rotation of the wiper also drives the insulating disk and the conductive plate to rotate until the conductive plate rotates to disengage from the second contact and the third contact. The body controller detects the level change of the third contact, controls the moving contact of the relay to attract the first static contact, and cuts off the power to the washing pump to stop spraying water. When the conductive plate rotates 360°, the first contact, the second contact, and the third contact are in contact with the conductive plate again, and a reset signal is sent to the body controller. After receiving the reset signal, the body controller controls the wiper motor to reset, completing a cycle of operation. Since the conductive plate is in the shape of an arc with the same center as the insulating disk, the size of the center angle of the conductive plate corresponds to the water spraying time of the washing pump. The larger the center angle of the conductive plate, the longer the water spraying time of the washing pump. Therefore, the center angle of the conductive plate can be designed according to actual needs. Moreover, since the reset signal is not a continuous signal, the conductive arc segment corresponding to the first contact is smaller than the other two conductive arc segments, which can reduce costs. The body controller of the water spray wiper control system obtains periodic high and low level signals according to the on and off of the third contact and the conductive plate, and then the body controller controls the on and off of the relay through the changes of the high and low level signals, thereby controlling the on and off of the washing pump to achieve water spraying in a certain area where the wiper moves upward, that is, the control system only needs a small current to drive the washing pump to operate, which can avoid large current passing through the conductive plate, solve the problem of damage to the conductive plate caused by large current ablation, thereby ensuring the control reliability of the washing pump and extending the service life of the water spray wiper.

[0009] The third contact sends a high-level control signal or a low-level control signal to the body controller. The body controller sets a 30-40ms filtering time for the rising edge and the falling edge of the low-level control signal respectively to avoid interference of clutter on the control signal and ensure the control reliability of the washing pump.

[0010] The conductive arc segment corresponding to the first contact among the three conductive arc segments of the conductive plate is located on the outside, in the middle, or on the inside, that is, the shape of the conductive plate can be selected to be most suitable for the installation structure according to the actual installation situation.

[0011] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a structural schematic diagram of a prior art;

[0014] Figure 3 It is a structural schematic diagram of another prior art. DETAILED DESCRIPTION

[0015] See also Figure 1A water spray control system for a car water spray wiper comprises a wiper motor, a washing pump 6, a first contact 2, a second contact 3, and a third contact 4. An insulating disk is fixed circumferentially on the motor shaft of the wiper motor, and a conductive plate 1 is provided on the insulating disk. The conductive plate 1 is in the shape of an arc with the same center as the insulating disk, and the central angle of the conductive plate 1 is less than or equal to 180°. When the wiper motor is running, the motor shaft will drive the insulating disk and the conductive plate 1 to rotate together. The front end of the conductive plate 1 contacts the first contact 2, the second contact 3, and the third contact 4, and the three contacts are all located at the front end of the conductive plate 1 in the rotation direction, so that after the conductive plate 1 rotates 360°, the three contacts can contact the front end of the conductive plate 1 in the rotation direction again. It also includes a body controller 7 and a relay 5. One end of the washing pump 6 is electrically connected to the moving contact of the relay 5, and the other end of the washing pump 6 is electrically connected to the negative electrode of the body power supply. The first static contact b of the relay 5 is connected to the common ground, the second static contact c of the relay 5 and the power supply end d are electrically connected to the positive electrode of the body power supply, the signal control end e of the relay 5 is electrically connected to the control signal output end of the body controller 7, and the power supply end and the second static contact c of the relay 5 are connected to the positive electrode of the body power supply via a fuse FU. The provision of the fuse can protect the components in the circuit. The first contact 2 is electrically connected to the reset signal end of the body controller 7, the second contact 3 is electrically connected to the negative pole of the body power supply, the third contact 4 is electrically connected to the control signal input end of the body controller 7, and the third contact 4 sends a high-level control signal or a low-level control signal to the body controller 7. When the third contact 4 is in contact with the conductive plate 1, the body controller 7 obtains a low level, and when the third contact 4 is separated from the conductive plate 1, the body controller 7 obtains a high level. The body controller 7 thereby obtains periodic high and low level control signals, and the body controller 7 sets a 30-40ms filtering time for the rising edge and falling edge of the low-level control signal respectively to avoid interference of clutter on the control signal, thereby effectively controlling the on and off of the relay 5 and ensuring the control reliability of the washing pump. When the second contact 3 and the third contact 4 are both in contact with the conductive plate 1, the body controller 7 obtains a low-level control signal, causing the moving contact a of the relay 5 to be attracted to the second static contact c, and the washing pump 6 is powered on and runs; when the second contact 3 or the third contact 4 is disengaged from the conductive plate 1, a high-level control signal is obtained through the body controller 7, causing the moving contact a of the relay 5 to be attracted to the first static contact b, and the washing pump 6 is powered off and stops running.The conductive plate 1 includes three conductive arc segments, which correspond to the first contact 2, the second contact 3, and the third contact 4, respectively. Since one of the conductive arc segments corresponds to the reset signal of the vehicle body controller 7 and does not need to be turned on for a long time, the arc length of the conductive arc segment corresponding to the reset signal end of the vehicle body controller 7 is smaller than the arc lengths of the other two conductive arc segments, and the arc lengths of the other two conductive arc segments are the same. The central angle of the conductive arc segment corresponding to the reset signal end is usually 20-60°, and the arc length can be designed according to actual needs within the central angle range, while the central angles of the other two conductive arc segments are the same and can also be selected within the range of 90-180° according to actual conditions. The arrangement positions of the three conductive arc segments of the conductive plate 1 can be interchanged, and the arrangement positions of the first contact 2, the second contact 3, and the third contact 4 change accordingly with the arrangement positions of the conductive arc segments, that is, the shape of the conductive plate 1 can be selected according to the actual installation situation to best fit the installation structure.

[0016] When in use, the washing shift switch on the car is closed. At this time, the first contact 2, the second contact 3, and the third contact 4 are all in contact with the conductive plate 1, and these three contacts are all located at the front end of the rotation direction of the conductive plate 1. At this time, the body controller 7 obtains a low-level control signal, and the moving contact a of the control relay 5 is attracted to the second static contact c, and the washing pump 6 is powered on to spray water on the car windshield. At the same time, the wiper moves upward. When the wiper rotates upward, it also drives the insulating disk and the conductive plate 1 to rotate until the conductive plate 1 rotates to separate from the second contact 3 and the third contact 4. At this time, the control signal obtained by the body controller 7 changes from a low level to a high level, and the moving contact a of the control relay 5 is attracted to the first static contact b, so that the washing pump 6 is powered off and stops spraying water. At the same time, the wiper continues to move upward or downward. When the conductive plate 1 rotates 360°, the first contact 2, the second contact 3, and the third contact 4 are in contact with the conductive plate 1 again, and a reset signal is sent to the body controller 7. After receiving the reset signal, the body controller 7 controls the wiper motor to reset and completes a cycle of operation. Since the conductive plate 1 is in an arc shape with the same center as the insulating disk, the size of the central angle of the conductive plate 1 corresponds to the water spraying time of the washing pump 6. The larger the central angle of the conductive plate 1, the longer the water spraying time of the washing pump 6. Conversely, the smaller the central angle of the conductive plate 1, the shorter the water spraying time of the washing pump 6. Therefore, the central angle α of the conductive plate 1 can be designed according to actual needs. The central angle α of the conductive plate 1 in this embodiment is 90°~180°, so the washing pump 6 will only spray water when the wiper moves upward, ensuring the washing effect while reducing the amount of water on the windshield.

[0017] The body controller 7 of the water spray wiper control system obtains periodic high and low level control signals according to the on and off of the third contact 4 and the conductive plate 1, and then the body controller 7 controls the on and off of the relay 5 through the changes of the high and low level signals, thereby controlling the on and off of the washing pump 6, so as to realize water spraying in a certain area where the wiper moves upward, that is, the control system only needs a small current to drive the washing pump 6 to operate, which can avoid the conductive plate 1 from passing a large current, and solves the problem of damage to the conductive plate 1 caused by ablation due to large current, thereby ensuring the control reliability of the washing pump 6 and extending the service life of the water spray wiper.

Claims

1. A water spray control system for a car water spray wiper, comprising a wiper motor, a washer pump, a first contact, a second contact, and a third contact, wherein an insulating disk is circumferentially fixed on the motor shaft of the wiper motor, and a conductive plate is provided on the insulating disk, wherein the conductive plate is in an arc shape with the same center as the insulating disk, and the central angle of the conductive plate is less than or equal to 180°, and the front end of the conductive plate is in contact with the first contact, the second contact, and the third contact, respectively, and characterized in that: It also includes a body controller and a relay, one end of the washing pump is electrically connected to the moving contact of the relay, the other end of the washing pump is electrically connected to the negative pole of the body power supply, the first static contact of the relay is connected to the common ground, the second static contact of the relay and the power supply end of the relay are electrically connected to the positive pole of the body power supply respectively, the signal control end of the relay is electrically connected to the control signal output end of the body controller, the first contact is electrically connected to the reset signal end of the body controller, the second contact is electrically connected to the negative pole of the body power supply, the third contact is electrically connected to the control signal input end of the body controller, the conductive plate includes three conductive arc segments, the three conductive arc segments correspond to the first contact, the second contact, and the third contact respectively, wherein the arc length of the conductive arc segment corresponding to the reset signal end of the body controller is smaller than the arc lengths of the other two conductive arc segments, and the arc lengths of the other two conductive arc segments are the same.

2. The water spray control system of the automobile water spray wiper according to claim 1, characterized in that: The third contact sends a high-level control signal or a low-level control signal to the vehicle body controller, and the vehicle body controller sets a filtering time of 30-40ms for the rising edge and the falling edge of the low-level control signal respectively.

3. The water spray control system of the automobile water spray wiper according to claim 1, characterized in that: The power supply end of the relay and the second static contact of the relay are connected to the positive pole of the vehicle body power supply via a fuse.

4. The water spray control system of the automobile water spray wiper according to claim 1, characterized in that: The arrangement positions of the three conductive arc segments of the conductive plate can be interchanged, and the arrangement positions of the first contact, the second contact and the third contact are changed accordingly with the arrangement positions of the conductive arc segments.

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