Car window motor control circuit and method

A technology of motor control and motor drive circuit, applied in the direction of rotation direction control, door/window accessories, power control mechanism, etc. Small, extended service life, impact noise reduction effect

Inactive Publication Date: 2018-11-13
CHONGQING HI LEX CABLE SYST GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The anti-pinch window regulator has an automatic lifting function. In the automatic lifting mode, if the MCU detects that the window is fully open or fully closed, it will control the first relay and the second relay to be disconnected at the same time, but it is not the same as the non-pinch window regulator. Like the window regulator, the anti-pinch window regulator still cannot change the speed of the motor. When the window glass is running to the fully open or fully closed position, the speed cannot be reduced, and the motor will instantly stall and generate a momentary high current, which will cause the window glass Cracking sound with body sheet metal
In order to reduce the impact sound of the window glass on the fully open or fully closed position, some anti-pinch glass regulators adopt a control method that cuts off the glass in advance through the control module when the window glass moves to the fully open or fully closed position. The motor supplies power, and the motor drives the window glass to the fully open or fully closed position through inertia. One disadvantage of this control method is that the window may not be closed tightly, and wind noise may be generated when the vehicle is running at high speed, reducing the comfort of the vehicle. sex

Method used

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  • Car window motor control circuit and method
  • Car window motor control circuit and method
  • Car window motor control circuit and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] see figure 1 , the window motor drive circuit includes two relays for controlling the power on or off of the window motor, the relay is connected to the output end of the MCU controller, and the MCU controller is used to control the power on or off of the two relays respectively Electricity, to control the forward rotation, reverse rotation or stop operation of the window motor; the window motor speed adjustment circuit includes a field effect transistor MOSFET, and the gate of the field effect transistor MOSFET is connected to the MCU controller, and the MCU controller passes Control the output duty cycle of the field effect tube MOSFET to adjust the average voltage across the window motor and control the running speed of the window motor.

[0037] The common end NM of the first relay is connected to one end of the window motor, the common end NM of the second relay is connected to the other end of the motor, the normally open end NO of the first relay, the normally o...

Embodiment 2

[0042] see figure 2 , the window motor drive circuit is an H-bridge motor drive circuit using four FETs, the gates of the four FETs are connected to the output terminals of the MCU controller respectively, and the MCU controller is used to control the four The conduction or disconnection of the field effect tube controls the forward rotation, reverse rotation or stop operation of the window motor; the MCU controller adjusts the average voltage at both ends of the window motor by controlling the output duty ratio of the field effect tube to control the window motor. The operating speed of the window motor. As the voltage across the motor changes, the current changes accordingly.

[0043] The motor control circuit of this embodiment is controlled by four MOSFETs. The gates of the four MOSFETs in this embodiment are respectively connected to the MCU controller through resistors R1, R2, R3, and R4. When the effect tube Q2, the FET Q3 and the FET Q4 are disconnected, the motor s...

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Abstract

The invention discloses a car window motor control circuit and method. When an MCU obtains that a vehicle window does not run to the position near the full-opening or full-closed position through a position sensor, the MCU is used for controlling the average voltage at the two ends of an car window motor to not change, so that the car window motor is kept at a set relatively high speed; when the MCU obtains the car window through the position sensor and reaches the full-opening or full-closed position, the MCU controls the average voltage at the two ends of the car window motor, so that the running speed of the car window motor is reduced, and the MCU controls the car window motor to run at a set relatively slow speed until the full-opening or full-closed position is completely closed andis blocked; and the MCU controls the car window motor to stop running when the MCU obtains a full-open or full-closed position through the position sensor. According to the car window motor control circuit and method, the impact sound of the car window glass and a car body metal plate is reduced when the car window glass runs to a fully-opened or fully-closed position, and the current is reduced when the car window glass runs to the full-opening or full-closed position.

Description

technical field [0001] The invention relates to the field of automobile electronic control, in particular to an automobile window motor control circuit and method. Background technique [0002] With the advancement of technology in the automotive field and the improvement of operating comfort requirements, many mobile devices in the car have been electrified and automated. For example, the window lifter has evolved from a manual crank to a non-pinch electric glass lift. device (electric mode) and anti-pinch window regulator (automatic mode). The electric or automatic lifting of the window is to add a motor to the traditional manual handle glass regulator, and supply power to the motor through the window control switch or the window control module to realize the forward and reverse rotation of the motor to drive the relevant mechanisms of the glass regulator to rise, decline. [0003] At present, the control circuit of non-pinch-proof electric window regulators or anti-pinc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E05F15/695H02P6/30
Inventor 刘贺师杰
Owner CHONGQING HI LEX CABLE SYST GRP CO LTD
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