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发明授权
US5939626A Tire pressure detecting device which compares driven and driving wheel speeds and acceleration wherein judgment is prohibited when slippage occurs 失效
轮胎压力检测装置，其比较驱动和驱动轮速度和加速度，其中当发生滑动时禁止判断

Tire pressure detecting device which compares driven and driving wheel speeds and acceleration wherein judgment is prohibited when slippage occurs
摘要：
When pressure in any one of tires of a vehicle becomes abnormally low, the tire pressure detecting device detects it and gives a warning to a driver. The tire pressure detection is solely performed based on a value calculated by an on-board micro computer from wheel speeds of each wheel sensed by wheel speed sensors. The calculated value to be used for the tire pressure detection must represent correctly the tire pressure. Whenever the calculated value has a possibility to misrepresent the tire pressure, such value is eliminated from the data for judging the tire pressure. When the value is calculated under a situation where any tire is slipping relative to a road surface, it is highly possible that the calculated value misrepresents the tire pressure. The situation where the tire slippage exists is found out by comparing a driving wheel acceleration with a driven wheel acceleration, and the value calculated under such situation is omitted from the data to be used for judging the tire pressure. It is also possible to prohibit calculation of the value when the tire slippage is found out. Thus, the tire pressure is detected with a high reliability.
摘要（中）：

当车辆的任何一个轮胎的压力变得异常低时，轮胎压力检测装置检测到，并向驾驶者发出警告。 轮胎压力检测仅基于由车轮微型计算机计算的值，由车轮速度传感器感测到的每个车轮的车轮速度进行。 用于轮胎压力检测的计算值必须正确表示轮胎压力。 无论何时计算出的值都有可能错误地表示轮胎压力，则从用于判断轮胎压力的数据中消除这样的值。 当在任何轮胎相对于路面滑动的情况下计算该值时，计算值很可能表示轮胎压力是非常有可能的。 通过将驱动轮加速度与从动轮加速度进行比较来发现轮胎滑动的情况，并且在用于判断轮胎压力的数据中省略了在这种情况下计算出的值。 当发现轮胎滑移时，也可以禁止计算该值。 因此，以高可靠性检测轮胎压力。

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