Limit damping type wiper motor

Abstract

The utility model discloses a limit damping type wiper motor which comprises a reset plate, a first contact, a second contact and a speed reduction control circuit board. The reset plate is driven by the wiper motor to rotate, and a notch is formed in the reset plate. One end of the second contact is respectively connected with the cathode of the wiper motor and one end of the deceleration control circuit board; the other end of the deceleration control circuit board is connected with the first contact and is grounded; when the reset plate rotates, the first contact is located in the circular ring drawn by the notch, and the second contact is located outside the circular ring drawn by the notch and always makes sliding contact with the reset plate. The speed reduction control circuit board is connected before reversing of the windscreen wiper, voltage division is carried out on the windscreen wiper motor, the rotating speed of the windscreen wiper motor is reduced, impact during reversing of the windscreen wiper is reduced, and then flanging sound is reduced. The speed reduction starting point position of the windscreen wiper motor is controlled through the notch position in the reset plate, the speed reduction distance can be conveniently adjusted, and impact generated when the windscreen wiper reverses is further reduced.

Description

Technical Field

[0001] The utility model relates to the field of wiper control, in particular to an extreme damping type wiper motor. Background Art

[0002] When the wiper is working, the large impact during switching causes a loud flanging sound, which affects the passenger experience. There are two existing solutions. One is to use smart wipers to reduce the input voltage of the wiper motor through chip control, thereby reducing the flanging speed and reducing the flanging sound; the other is to directly connect a resistor in series to the system for voltage division when the wiper is running to the switching position, thereby reducing the flanging speed and reducing the flanging sound. Of the above two solutions, Solution 1 is costly due to chip control, and Solution 2 will cause the wiper to have a noticeable sense of frustration, and may result in dry wiping without movement. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an extreme damping type wiper motor which solves the problem of large impact causing loud flange noise when the wiper is switched.

[0004] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the utility model is:

[0005] Provided is an extreme damping wiper motor, comprising a wiper motor, a reset plate, a first contact, a second contact and a deceleration control circuit board; the reset plate is driven to rotate by the wiper motor, and a notch is arranged on the reset plate; one end of the second contact is respectively connected to the negative pole of the wiper motor and one end of the deceleration control circuit board; the other end of the deceleration control circuit board is connected to the first contact and is grounded;

[0006] When the reset plate rotates, the first contact is located in the circle drawn by the notch, and the second contact is located outside the circle drawn by the notch and is always in sliding contact with the reset plate; when the first contact is located in the notch, the first contact is disconnected from the second contact, and the deceleration control circuit board is connected to the loop to form a voltage divider for the wiper motor, and the wiper motor decelerates; when the first contact is located outside the notch, the first contact is electrically connected to the second contact through the reset plate, the deceleration control circuit board is short-circuited, and the wiper motor operates normally.

[0007] Further, the deceleration control circuit board includes a PMOS tube and an NMOS tube; the drain of the NMOS tube is respectively connected to one end of the resistor R5, one end of the resistor R1, the source of the PMOS tube and the negative electrode of the wiper motor; the gate of the NMOS tube is respectively connected to the collector of the PNP transistor Q2 and one end of the resistor R3 through the resistor R8; the source of the NMOS tube is respectively connected to the other end of the resistor R1, the other end of the resistor R3, the emitter of the NPN transistor Q1, one end of the capacitor C1, the positive electrode of the voltage stabilizing diode D2, one end of the resistor R7, one end of the capacitor C2 and grounded;

[0008] The gate of the PMOS tube is connected to the other end of the resistor R5 and the cathode of the voltage stabilizing diode D2 respectively; the drain of the PMOS tube is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to one end of the resistor R6 and the other end of the capacitor C2 respectively; the other end of the resistor R6 is connected to the other end of the resistor R7, the other end of the capacitor C1 and the base of the NPN transistor Q1 respectively;

[0009] The emitter of the PNP transistor Q2 is connected to one end of the resistor R4 and the external power supply respectively; the base of the PNP transistor Q2 is connected to one end of the resistor R2 and the other end of the resistor R4 respectively; the other end of the resistor R2 is connected to the collector of the NPN transistor Q1.

[0010] Furthermore, the speed reduction amplitude of the wiper motor is controlled by the resistance value of the resistor R1.

[0011] Furthermore, the speed reduction starting point of the wiper motor is controlled by the position of the notch on the reset plate.

[0012] Further, the normal operating speed of the wiper motor is controlled by the body controller.

[0013] The beneficial effects of the utility model are:

[0014] 1. The utility model controls the deceleration starting point of the wiper motor by the notch position on the reset plate, so as to adjust the deceleration distance; before the wiper is switched, a deceleration control circuit board is connected to divide the voltage of the wiper motor, so as to realize damping deceleration at the extreme position of the wiper motor switching, reduce the impact when the wiper is switched, and further reduce the flange sound.

[0015] 2. The deceleration control circuit board of the utility model controls the opening of the MOS tube through the voltage-stabilizing diode D2 to weaken the sudden change of the motor current, avoid the wiper from having an obvious sense of frustration, prevent the wiper motor from being unable to wipe dry, and improve the user experience and wiper life.

[0016] 3. The utility model can control the speed reduction range of the wiper motor by adjusting the resistance value of the resistor R1, thereby protecting the service life of the wiper rubber strip.

[0017] 4. Based on the existing wiper, the utility model realizes the deceleration of the wiper system through the coordinated cooperation of the reset plate and the deceleration control circuit board, and has a simple structure, low cost and strong versatility.

[0018] 5. The deceleration control circuit board of the utility model can also realize the snow blocking protection function at the extreme position to prevent the deceleration control circuit board from being burned due to the blocking current. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model;

[0020] Figure 2 This is the circuit diagram of the deceleration control circuit board.

[0021] Among them: 1. Wiper motor; 2. Reset plate; 3. Notch; 4. First contact; 5. Second contact; 6. Deceleration control circuit board; 7. Body controller. DETAILED DESCRIPTION

[0022] The specific implementation modes of the present invention are described below to facilitate the understanding of the present invention by those skilled in the art. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those skilled in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0023] like Figure 1 As shown, the extreme damping wiper motor comprises a wiper motor 1, a reset plate 2, a first contact 4, a second contact 5, and a deceleration control circuit board 6; the reset plate 2 is driven to rotate by the wiper motor 1, and a notch 3 is provided on the reset plate 2; one end of the second contact 5 is respectively connected to the negative electrode of the wiper motor 1 and one end of the deceleration control circuit board 6; the other end of the deceleration control circuit board 6 is connected to the first contact 4 and grounded;

[0024] When the reset plate 2 rotates, the first contact 4 is located in the circle drawn by the notch 3, and the second contact 5 is located outside the circle drawn by the notch 3 and is always in sliding contact with the reset plate 2; when the first contact 4 is located in the notch 3, the first contact 4 and the second contact 5 are disconnected, and the deceleration control circuit board 6 is connected to the loop to form a voltage divider for the wiper motor 1, and the wiper motor 1 decelerates; when the first contact 4 is located outside the notch 3, the first contact 4 is electrically connected to the second contact 5 through the reset plate 2, the deceleration control circuit board 6 is short-circuited, and the wiper motor 1 operates normally.

[0025] like Figure 2 As shown, the deceleration control circuit board 6 includes a PMOS tube and an NMOS tube; the drain of the NMOS tube is respectively connected to one end of the resistor R5, one end of the resistor R1, the source of the PMOS tube and the negative electrode of the wiper motor 1 (CON1 interface); the gate of the NMOS tube is respectively connected to the collector of the PNP transistor Q2 and one end of the resistor R3 through the resistor R8; the source of the NMOS tube is respectively connected to the other end of the resistor R1, the other end of the resistor R3, the emitter of the NPN transistor Q1, one end of the capacitor C1, the positive electrode of the voltage stabilizing diode D2, one end of the resistor R7, one end of the capacitor C2 and grounded (CON2 interface);

[0026] The gate of the PMOS tube is connected to the other end of the resistor R5 and the cathode of the voltage stabilizing diode D2 respectively; the drain of the PMOS tube is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to one end of the resistor R6 and the other end of the capacitor C2 respectively; the other end of the resistor R6 is connected to the other end of the resistor R7, the other end of the capacitor C1 and the base of the NPN transistor Q1 respectively;

[0027] The emitter of the PNP transistor Q2 is respectively connected to one end of the resistor R4 and the external power supply (CON3 interface); the base of the PNP transistor Q2 is respectively connected to one end of the resistor R2 and the other end of the resistor R4; the other end of the resistor R2 is connected to the collector of the NPN transistor Q1.

[0028] The speed reduction range of the wiper motor 1 is controlled by the resistance value of the resistor R1 . The speed reduction starting point of the wiper motor 1 is controlled by the position of the notch 3 on the reset plate 2 .

[0029] In the specific implementation process, the drive of the wiper system is controlled by the body controller 7. The existing body controller 7 has the functions of low speed, high speed, automatic speed, etc. The deceleration function of the utility model has nothing to do with the structure of the body controller 7, and the body controller 7 is not the innovation of the utility model, so it will not be repeated. Similarly, the reversing of the wiper system is completed by the reversing link mechanism, which is the existing technology. The deceleration function of the utility model has nothing to do with the reversing link mechanism, so it will not be repeated.

[0030] In the deceleration control circuit board 6, the voltage stabilizing diode D2 is used to control the opening and closing of the circuit. The resistor R1 is used for voltage division, and the capacitor C1, the capacitor C2, the resistor R6 and the resistor R7 are used to control the opening time of the NPN transistor Q1, the PNP transistor Q2 and the NMOS tube. The NPN transistor Q1 and the PNP transistor Q2 are used for current amplification respectively. The NPN transistor Q1 and the PNP transistor Q2 are combined into a switch to introduce a turn-on voltage to the NMOS tube. When the PNP transistor Q2 is turned on, the NMOS tube will work. Both the NMOS tube and the PNO transistor are used as switches. The remaining resistors are used as bias.

[0031] The functions of the deceleration control circuit board 6 under different working conditions of the wiper are as follows:

[0032] 1. High and low speed wet wiping of the wiper: When the wiper motor 1 is at the extreme position, the deceleration control circuit board 6 is connected in series with the wiper motor 1 circuit. Since the high and low speed wet wiping current is small, about 2A, the voltage regulator diode D2 (selected start voltage 7.5V) is turned off, the whole circuit does not work, and the resistor R1 is normally connected to the motor to achieve extreme position deceleration and reduce the wiper wiping edge noise.

[0033] 2. Dry wiping of wipers: During the dry wiping process of wiper motor 1, the current of wiper motor 1 gradually increases, and the voltage divider of resistor R1 gradually increases. When the voltage divider voltage is >7.5V, the voltage regulator diode D2 is turned on, and then the PMOS tube is turned on, and then the NPN transistor Q1, PNP transistor Q2, and NMOS tube are turned on in sequence. The NMOS tube short-circuits the resistor R1, and the wiper motor 1 works normally, preventing the wiper motor 1 from being unable to wipe during dry wiping.

[0034] 3. Snow blocking protection at extreme position: When the wiper motor 1 is in a blocked state at the extreme position under snow load, the voltage divider of resistor R1 gradually increases. When the voltage divider voltage is >7.5V, the Zener diode D2 is turned on, followed by the PMOS tube, PN transistor Q1, PNP transistor Q2 and NMOS tube being turned on in sequence. The NMOS tube short-circuits the resistor R1 to prevent the resistor R1 from burning out due to the blocked current.

[0035] In summary, the utility model connects the deceleration control circuit board 6 before the wiper is switched, divides the voltage of the wiper motor 1, reduces the speed of the wiper motor 1, reduces the impact when the wiper is switched, and thus reduces the flange sound. The utility model controls the deceleration starting point of the wiper motor 1 by the position of the notch 3 on the reset plate 2, which is convenient for adjusting the deceleration distance and further reducing the impact when the wiper is switched.

Claims

1. An extreme damping wiper motor, characterized in that: It includes a wiper motor, a reset plate, a first contact, a second contact and a deceleration control circuit board; the reset plate is driven to rotate by the wiper motor, and a notch is arranged on the reset plate; one end of the second contact is respectively connected to the negative pole of the wiper motor and one end of the deceleration control circuit board; the other end of the deceleration control circuit board is connected to the first contact and is grounded; When the reset plate rotates, the first contact is located in the circle drawn by the notch, and the second contact is located outside the circle drawn by the notch and is always in sliding contact with the reset plate; when the first contact is located in the notch, the first contact is disconnected from the second contact, and the deceleration control circuit board is connected to the loop to form a voltage divider for the wiper motor, and the wiper motor decelerates; when the first contact is located outside the notch, the first contact is electrically connected to the second contact through the reset plate, the deceleration control circuit board is short-circuited, and the wiper motor operates normally.

2. The extreme damping wiper motor according to claim 1, characterized in that: The deceleration control circuit board includes a PMOS tube and an NMOS tube; the drain of the NMOS tube is respectively connected to one end of the resistor R5, one end of the resistor R1, the source of the PMOS tube and the negative electrode of the wiper motor; the gate of the NMOS tube is respectively connected to the collector of the PNP transistor Q2 and one end of the resistor R3 through the resistor R8; the source of the NMOS tube is respectively connected to the other end of the resistor R1, the other end of the resistor R3, the emitter of the NPN transistor Q1, one end of the capacitor C1, the positive electrode of the voltage stabilizing diode D2, one end of the resistor R7, one end of the capacitor C2 and grounded; The gate of the PMOS tube is connected to the other end of the resistor R5 and the cathode of the voltage stabilizing diode D2 respectively; the drain of the PMOS tube is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to one end of the resistor R6 and the other end of the capacitor C2 respectively; the other end of the resistor R6 is connected to the other end of the resistor R7, the other end of the capacitor C1 and the base of the NPN transistor Q1 respectively; The emitter of the PNP transistor Q2 is connected to one end of the resistor R4 and the external power supply respectively; the base of the PNP transistor Q2 is connected to one end of the resistor R2 and the other end of the resistor R4 respectively; the other end of the resistor R2 is connected to the collector of the NPN transistor Q1.

3. The extreme damping wiper motor according to claim 2, characterized in that: The speed reduction of the wiper motor is controlled by the resistance value of resistor R1.

4. The extreme damping wiper motor according to claim 1, characterized in that: The speed reduction starting point of the wiper motor is controlled by the notch position on the reset plate.

5. The extreme damping wiper motor according to claim 1, characterized in that: The normal operating speed of the wiper motor is controlled by the body controller.

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