Car window motor control circuit and method

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...

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

Images