Using HALL sensor to realize car electric window anti-pinch summary: This paper introduces the characteristics and advantages of using Hall sensor to realize car electric window anti-pinch. Combined with the background of the car electric window anti-pinch, the importance of the electric window anti-pinch is explained. The relationship between the anti-pinch of the electric window and the force of the glass is analyzed. Combined with the hardware and software technology, the maximum clamping force of the electric window anti-pinch is 100N (about 10kg weight).
In line with the US FMVSS118 safety regulations (US safety regulations for automotive power windows, automatic doors, electric sunroofs, etc. require a maximum clamping force of 100N for electric windows.)
Background: A National Accidental Investigation of the National Highway Safety Administration (NHSTA) in 1997. A 1997 safety accident survey indicated that approximately 499 emergency cases in the United States each year were caused by the operation of automotive electric accessories. About 93% of the victims are from the electric window of the car, 32% of the victims are younger than 6 years old, and another 32% of the victims are younger than 15 years old. Personal safety is not guaranteed, and car electric window anti-clamping can not be delayed.
Key words: single-chip control module, remote central control lock, bus control, power window mode actuator output force gravity friction force interference force.
First analyze the car electric window anti-pinch related to those technical data.
1, power windows mode of basic technical parameters:
First look at a set of formulas: FA = FG + FF + FD + FO
Among them: FA actuator output force; FG gravity; FF friction force; FD interference (uneven road surface); FO obstacle resistance (clip force)
The car electric window switch must be able to prevent the clamping after overcoming the gravity, friction and various interferences. If one of the forces is relatively large, it may affect the anti-clamping effect of the switch. Therefore, considering these factors, the car power window switch has to undergo numerous calculations and repeated experiments to obtain precise data. Combined with repeated testing of hardware and software, to accurately detect the hardware and software configuration of the detection methods in order to achieve accurate auto manufacturers to achieve the anti-pinch and customer requirements.
Introduction pinch principle: the remote, manual or auto windows, glass is determined by the position sensor HALL, can be divided into a power window lift and hazardous areas safe area (secure area away from the top of the glass-25mm 4mm at all for other hazardous area ). In the danger zone, if there is a foreign matter blocking the glass rise during the rising of the glass (maximum 100N clamping force, about 10kg weight), the power window will immediately stop rising and immediately fall to the end to achieve the anti-pinch function. When the safety zone, from the top because the glass does not exist only 4mm-25mm glass blocking foreign matter rises, so the safety of the divided region. If there is no safe zone, the glass may go back down the glass after the top, and the window lift function cannot be realized.
Advantages of anti-pinch: low cost, simple line connection, suitable for any vehicle type.
Anti-pinch features: Overcome the misjudgment of the old-fashioned electric window anti-pinch switch, causing the glass to not rise and fall normally.
The model of the electric window switch produced by our company is: CCKG-012A. SCM control module, in conjunction with the control bus address decoding technology, to achieve automatic locking liter glass remote control, remote central locking, manual lifting glass, child lock button, burglar alarm, stall protection, pinch power window functions.
This switch uses Microchip's microcontroller (microcontroller) with E2PROM memory, which can store the safety zone and danger zone signals inside the microcontroller. When the misoperation is prevented, the MCU is reset and unnecessary safety hazards occur.
CCKG-012A control advantages:
1), simplified electrical connection, reasonable power distribution. The main unit (left front door switch) and other door switches are separately powered separately. The main unit and other door switches are connected by a communication line. The hardware address decoding is combined with software code technology to realize the host's control of other doors.
Each door control switch is independently powered, and reasonable power distribution improves power utilization efficiency. The independent operation of each switch does not affect the operation of other doors.
2), the stalled protective glass motor in the working process, there will be different load conditions, such as improper installation of the glass trough, foreign objects trapped in the glass window, will cause the motor current is unstable. This switch combines hardware and software detection to achieve the stalling and anti-clamping function of the motor.
Concluding remarks: Our company has been studying for many years, through numerous car environment simulation experiments, and loading experiments. Completed a complete set of automotive electric window anti-trap solutions, and the products have been put into use, and received high praise from customers. Breaking the old-fashioned electric window switch can not achieve anti-pinch, high risk factor and other shortcomings. Filled a gap in the domestic automotive electrical accessory industry.
This article refers to the address: http://
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