Anti-pinch sensor and method for electric vehicle window

Abstract

A power window anti-pinch sensor, characterized in that, at least two capacitors and sensor detecting circuits are provided on the surface of the top edge of the window glass (13); the most top capacitor is the main detecting capacitor C1, and the lower capacitor is the auxiliary detecting capacitor C2. The main detecting capacitor C1 and the auxiliary detecting capacitor C2 detect whether human body approaches or contacts the top edge of the window glass (13), and the signals of capacitance change generated from the human body approaching are detected by the main detecting capacitor C1 and the auxiliary detecting capacitor C2; the signals are transmitted to the sensor detecting circuits, which generate control signals controlling actions of the lifting motor of the power window based on the detected signals of change from the main detecting capacitor and the auxiliary detecting capacitor. The structure of the sensor is simple, and it is able.to achieve the anti-pinch function with zero pinching force which cannot be achieved by the existing anti-pinch sensor, which detects the current going through the lifting motor or the lifting position of the window glass (13).

Description

technical field [0001] The invention relates to an anti-pinch sensor for electric windows in automobiles, and also relates to an anti-pinch method for electric windows. Background technique [0002] At present, most of the cars in the world are equipped with electric windows, but the electric windows may clamp the limbs of the human body during the rising process and cause harm to the human body, especially to children. For this reason, both the United States and Europe have promulgated regulations requiring that electric windows must be equipped with anti-pinch devices. European and American regulations require that the clamping force generated when the electric window is raised must not exceed 100 Newtons. When the clamping force exceeds 100 Newtons, the anti-pinch The clamping device must reverse the movement of the power window to a position that is safe for the human body. [0003] So far, all middle and high-end cars in the world have been equipped with anti-pinch dev...

AI Technical Summary

Problems solved by technology

[0006] 1. The test product can be carefully calibrated for the test vehicle so that the anti-clamping force meets the requirements of the regulation 100N. Influenced by factors such as inconsistency in the processing of mechanical structures, it is difficult to ensure that the anti-clamping force of batch products meets the consistency of regulatory requirements

[0007] 2. After the product leaves the factory, due to changes in hardness, aging deformation, wear and deformation of the lifting mechanism structure, and deformation of the window frame, the rubber sealing strip is affected by the ambient temperature and other factors, resulting in friction or pressure changes that may easily lead to the following two types of anti-pinch systems: Misjudgment failure: (1) If the normal friction or pressure decreases, when the clamping force of an obstacle reaches or exceeds 100N, the anti-clamping device may mistakenly think that it has not reached 100N and not act in reverse, resulting in damage to the human body. (2) If the normal friction or pressure increases to more than 100N as required by the regulations, in the absence of any obstacles, the anti-pinch device may malfunction, resulting in the failure of the window to rise normally

The disadvantage is that on the one hand, infrared light is easily affected by bad weather such as rain, fog, and dust; on the other hand, multiple pairs of infrared emitting and receiving devices are required to form an infrared light curtain, which makes installation difficult and costly

[0022] (1) The open detection electrode cannot judge the orientation of the object

Since the electric field lines surround the detection electrodes, the detection system will make a wrong judgment when encountering a conductor close to the side, such as the occupant's head, or holding the handrail on the side

[0023] (2) The electrodes installed in the sealing strip will be deformed due to stress caused by rubber aging, temperature changes, improper assembly, door deformation, etc., which will interfere with signal detection

[0024] (3) Changes in external temperature and humidity will change the dielectric constant and interfere with the detection circuit

[0025] (4) Although the detection wire with a shielding layer (similar to a coaxial cable) is not affected by the external environment, it cannot achieve non-contact anti-clamping, and also has the defects described in the above item (2)

[0026] Therefore, the existing various capacitive anti-pinch technologies have not been adopted by the automotive front-loading market.

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