Wheel position judgment system and wheel position judgment method

Abstract

A car wheel position judging system comprises a plurality of monitor sending devices, a wheel speed sensor unit and an electronic control unit, wherein the multiple monitor sending devices are arranged on a plurality of car wheels, and the wheel speed sensor unit comprises a plurality of wheel speed sensor devices. When the corresponding car wheel rotates to a first position and a second position within a sending period, each monitor sending device sends two monitor signals related to a device number. A first angle is intersected between the connecting line from the first position to a rotating shaft of the car wheel and the connecting line from the second position to the rotating shaft of the car wheel. A second angle is intersected between the connecting line from the first position in the previous-time sending period to the rotating shaft of the car wheel and the connecting line from the first position in the later-time sending period to the rotating shaft of the car wheel. The electronic control unit analyzes the monitor signals and a tooth number signal output from each wheel speed sensing device, and makes the device number to be matched with the wheel speed sensing devices according to the first angle and the absolute angle variable quantity of the car wheel, and accordingly the position of the car wheel on a car can be determined.

Description

technical field [0001] The invention relates to a judgment system and a judgment method, in particular to a wheel position judgment system and a wheel position judgment method. Background technique [0002] At present, vehicles have become quite common means of transportation in modern society, and whether the tire pressure of the wheels is appropriate or not is a key part of driving safety. Therefore, Tire Pressure Monitoring System (TPMS) has become a modern The equipment that the vehicle should be equipped with. [0003] However, when each tire pressure detector is set on the wheel, it must be set one by one, so that an electronic control unit (Electronic Control Unit, ECU) in the vehicle determines which tire pressure detector is set on which wheel, so as to know which wheel the received detection signal related to tire pressure corresponds to. In addition, if the front and rear wheels are reversed, it will have to be reset again, which will only increase the cost of m...

AI Technical Summary

Problems solved by technology

[0006] However, the above-mentioned prior art has significant disadvantages, because for a single transmitting point, the electronic control unit can easily fail to receive the signal and form a blind spot, or it may receive multiple detection signals at the same time and cause overlap and cannot identify

In addition, the emission point with a fixed time difference will also produce an aliasing (aliasing) effect as the speed of the vehicle increases, which is likely to cause misjudgment

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