tire pressure 警告灯亮了
- 主题发起人 wilson111
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0000088
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Do you have winter tires? if so, it is possible. since winter tire is no sensor. you can ask the deal, you might be able to purchase sensor or leave it alone.
my car has this during the winter time, after you switch back to normal time, the light will be turned off automatically,.
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- 2003-06-21
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- 注册
- 2003-06-21
- 消息
- 32,112
- 荣誉分数
- 4,179
- 声望点数
- 373
一个轮子转的慢求解用ABS计算轮胎转速如何得知轮胎的气压？
RTFM
Indirect TPMS[edit]
Indirect TPMS do not use physical pressure sensors but measure air pressures by monitoring individual wheel rotational speeds and other signals available outside of the tire itself. First generation iTPMS systems utilize the effect that an under-inflated tire has a slightly smaller diameter (and hence higher tangential velocity) than a correctly inflated one. These differences are measurable through the wheel speed sensors of ABS/ESC systems. Second generation iTPMS can also detect simultaneous under-inflation in up to all four tires using spectrum analysis of individual wheels, which can be realized in software using advanced signal processing techniques. The spectrum analysis is based on the principle that certain eigenforms and frequencies of the tire/wheel assembly are highly sensitive to the inflation pressure. These oscillations can hence be monitored through advanced signal processing of the wheel speed signals. Current[when?] iTPMS consist of software modules being integrated into the ABS/ESC units.
iTPMS cannot measure or display absolute pressure values, they are relative by nature and have to be reset by the driver once the tires are checked and all pressures adjusted correctly. The reset is normally done either by a physical button or in a menu of the on-board computer. iTPMS are, compared to dTPMS, more sensitive to the influences of different tires and external influences like road surfaces and driving speed or style. The reset procedure, followed by an automatic learning phase of typically 20 to 60 minutes of driving under which the iTPMS learns and stores the reference parameters before it becomes fully active, cancels out many, but not all of these. As iTPMS do not involve any additional hardware, spare parts, electronic or toxic waste as well as service whatsoever (beyond the regular reset), they are regarded as easy to handle and very customer friendly.[2]
According to Nira, based on their request to TÜV SÜD to do a pre-test according to similar requirements of the EU legislation, the iTPMS system passed that pre-test.[3] However, the full test procedure as required by the EU regulation, completed by the regulatory body assigned to make the homologation, has not yet been done. Manufacturers like Dunlop Tech also claim their products to fulfill the regulations.[4]
iTPMS are regarded as inaccurate by some stances due to their nature. As such, most TPMS units now on the market are of the Direct type.
