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Car window speed control circuit and method

A speed control and window technology, which is applied in door/window accessories, buildings, and operating mechanisms of wing sashes, etc., can solve problems such as the inability to achieve a constant speed of the window, the lack of automatic speed adjustment, and the reduction of vehicle comfort.

Active 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

However, in the way of relay control, the speed of the window motor is determined by the voltage of the motor power supply. When the relay is turned on, if the voltage of the power supply is high, the voltage at both ends of the motor is high, and the speed of the motor is faster. The window runs faster; if the power supply If the voltage is low, the voltage at both ends of the motor will be low, and the speed of the motor will be slower, and the window will run slower
There is no automatic speed adjustment function during the whole operation of the window. If the power supply voltage or the resistance of the rubber strip changes during the operation of the window, the running speed of the window will be accelerated or slowed down, and it is impossible to realize the entire operation of the window. Constant speed during the process, reduced comfort of the vehicle

Method used

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  • Car window speed control circuit and method
  • Car window speed control circuit and method
  • Car window speed control circuit and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 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 grid 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.

[0045] 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

[0050] 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.

[0051] The motor control circuit of this embodiment is controlled by four MOSFETs. When the MOSFETs Q1, Q2, Q3, and Q4 are disconnected, the motor stops running; When the effect tube Q4 is turned on, and the FET Q2 and the FET Q3 are disconnected, the motor runs clockwise or counterclockwise; when the FET Q2 and the FET Q3 are turned on, the FET Q1 is disconnected from th...

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Abstract

The invention discloses a car window speed control circuit and method. The car window speed control circuit comprises an MCU, a car window motor driving circuit, a car window motor rotating speed adjusting circuit and a position sensor; the MCU is used for pre-writing the target speed of the operation of a motor, the MCU calculates the actual speed of the operation of the motor according to the square waves generated by the position signals in the operation process of the car window, the speed of the motor is automatically adjusted by adopting the PID control, namely, when the actual speed ofthe motor is smaller than the target speed of the motor, the MCU increases the duty ratio output of the MOSFET to increase the average voltage at the two ends of the motor to increase the rotating speed of the motor, and when the actual speed of the motor is larger than the target speed of the motor, the MCU increases the duty ratio output of the MOSFET so as to reduce the average voltage at the two ends of the motor and reduce the rotating speed of the motor. According to the car window speed control circuit and method, the running speed of the car window in the whole stroke can be kept stable, the running speed of the car window cannot be slowed due to the change of the load of the car window, and the operation comfort of the car window is improved.

Description

technical field [0001] The invention relates to the field of automobile electronic control, in particular to an automobile window speed control circuit and method. Background technique [0002] With the advancement of technology in the automotive field and the increase in the demand for operating comfort, people are more concerned about the comfort and safety of vehicles while enjoying the convenience brought by cars. Among the many components of the body, the window is one of the important components, and the window with anti-pinch function has been applied to the car. [0003] At present, the windows with anti-pinch function all have manual lifting and automatic lifting functions. The manual lift function means that the window moves up and down when the user operates the window control switch, and the window stops running when the user stops operating the window control switch; the automatic lift function means that when the window is running, even if the user stops opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E05F15/695E05F15/40
CPCE05F15/40E05F15/695E05Y2900/55
Inventor 刘贺卓亚鸿
Owner CHONGQING HI LEX CABLE SYST GRP CO LTD
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