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Power window switch anti-pinch system

A switch and window technology, applied in the field of automation, can solve the problem of high cost and achieve the effect of reducing product design cost

Inactive Publication Date: 2013-11-20
MARQUARDT SWITCHES (SHANGHAI) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This detection system needs to add hardware circuits such as capacitance detection chips and electrode sensors, and the cost is relatively high.

Method used

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  • Power window switch anti-pinch system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Power window switch anti-pinch systems, such as figure 2 As shown, it includes a motor drive switch, a current monitoring circuit, and a microprocessor;

[0027] The motor drive switch is connected to the power supply circuit of the window drive motor. When the motor drive switch is turned on, the window drive motor rotates forward, and when the motor drive switch is turned off, the window drive motor stops or reverses;

[0028] The current monitoring circuit is used to collect the working current signal of the window drive motor;

[0029] The microprocessor samples the working current signal of the window drive motor after the motor drive switch is turned on;

[0030] The microprocessor is calibrated with the start-up period of the window drive motor, and the microprocessor calculates and determines the anti-trapping time according to n sampling values ​​of the working current signal in the start-up period after the motor drive switch is turned on. Threshold current...

Embodiment 2

[0035] Based on the electric window switch anti-pinch system of Embodiment 1, the microprocessor is calibrated with the start-up period of the window drive motor, the initial start-up period, the first sampling period, and the second sampling period;

[0036] The duration of the initial startup phase is less than or equal to 2 / 3 of the duration of the startup phase, the first sampling period is less than the second sampling period, and the first sampling period is less than or equal to 1 / 3 of the duration of the initial startup phase, and the second sampling period is less than 1 of the duration of the startup phase / 3;

[0037]The calibration of the calibration value of the initial start-up period should ensure that the peak current Ip of the start-up current of the window drive motor appears within the initial start-up period after the window drive motor starts to run.

[0038] The microprocessor samples the working current signals of the window driving motors in the first s...

Embodiment 3

[0041] Based on the electric window switch anti-pinch system of Embodiment 2, the microprocessor, the calibrated start-up period of the window drive motor is 36 milliseconds, the initial start-up period is 20 milliseconds, the first sampling period is 4 milliseconds, and the first sampling period is 4 milliseconds. The second sampling period is 8 milliseconds.

[0042] Such as image 3 As shown, after the window drive motor starts to run, the peak value of the starting current of the window drive motor appears within 20 milliseconds of the calibrated initial start-up period; within 20 milliseconds of the initial start-up period after the motor drive switch is turned on , the microprocessor continuously samples the working current signal of the window drive motor collected by the current monitoring circuit for 5 times with the first sampling period of 4 milliseconds, and selects the maximum sampled value as the first current signal sampled value; After exceeding the initial st...

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Abstract

The invention discloses a power window switch anti-pinch system comprising a motor drive switch, a current monitoring circuit and a microprocessor. The motor drive switch is connected to a power supply loop of a window drive motor. The motor drive switch is switched on and off to control the window drive motor to forwardly rotate, stop rotating or reversely rotate. The current monitoring circuit is used for acquiring an operating current signal of the window drive motor. The microprocessor samples the operating current signal of the window drive motor after the motor drive switch starts to switch on. The microprocessor calibrates startup phase duration of the window drive motor, calculates to determine anti-pinch threshold current according to n operating current signal sampled values in the startup phase duration after the motor drive switch starts to switch on, and controls the motor drive switch to switch off when the operating current signal after the motor drive switch starts to switch on for a period exceeding the startup phase duration is larger than the anti-pinch threshold value. The power window switch anti-pinch system is satisfactory to pinch prevention under the set pressure and is low in cost.

Description

technical field [0001] The invention relates to automation technology, in particular to an electric window switch anti-pinch system. Background technique [0002] With the rapid development of the automobile industry, more and more attention is paid to the safety of automobiles at home and abroad. Now the research and development of electric windows with anti-pinch function has become a hot spot in the automotive electronics industry. [0003] Some of the current electric window switches have the function of one-key up (Auto up). When the user uses the one-key up function, the window will automatically rise to the top. In order to prevent people from being pinched when their body parts are in the window during the ascent process, some door and window switches will use the anti-pinch function. When an object is detected in the window, it will stop the window and continue to go up. move to avoid pinching. [0004] In the current mainstream door and window switches with anti-...

Claims

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Application Information

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IPC IPC(8): E05F15/20E05F15/695E05F15/70
Inventor 王立屠科
Owner MARQUARDT SWITCHES (SHANGHAI) CO LTD
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