Apparatus for estimating tire condition and apparatus for determining tire abnormal condition
A tire and state technology, applied in tire measurement, tire parts, transportation and packaging, etc., can solve problems such as abnormality in the load area of small tires, and achieve the effect of improving reliability and detection accuracy
Inactive Publication Date: 2004-09-15
TOYOTA JIDOSHA KK
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[0010] Therefore, in a state where the tire abnormality is determined by comparing the detected tire pressure with a reference tire value independent of the tire load, there is a possibility that the tire still has a certain pressure relative to the tire load limit. The small tire load area of the space is judged to be anomalous
On the other hand, it is possible for a tire to be judged normal in a large tire load zone where there is not much space relative to the tire load limit
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[0167] Furthermore, according to the first embodiment, the state in which the reflection accuracy is lowered is divided into two states. One state is a state I in which the accuracy of reflecting the tire pressure on the wheel speed signal is relatively low, and the other state is a state in which the accuracy of reflecting the tire pressure on the wheel speed signal is somewhat low. According to the first embodiment of the present invention, data selection is performed when the accuracy of reflection of the tire pressure on the wheel speed signal is relatively low. On the other hand, when the accuracy of reflecting the tire pressure on the wheel speed signal is somewhat low, data correction is performed without data selection.
[0168] Next, the tire pressure abnormality determination routine will be described with reference to the flowchart shown in FIG. 4 .
[0169] The failure determination of the vehicle state quantity detection device 40 is performed in step S11 every t...
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An apparatus for estimating a tire pressure condition amount of a tired wheel mounted in a vehicle is provided with a wheel speed sensor (10) for detecting a vehicle wheel speed representing an angular speed of the tired wheel and for outputting a vehicle wheel speed signal in response thereto and an estimating unit (20) for estimating the tire pressure condition amount based upon the vehicle wheel speed signal outputted from the wheel speed sensor. The estimating unit includes a vehicle condition amount detecting device (40) for detecting a vehicle condition amount and for outputting a vehicle condition amount signal in response thereto. An estimation of the tire pressure condition amount by using the vehicle wheel speed signal is normalized based upon the vehicle condition amount signal outputted from the vehicle condition amount detecting device.
Description
technical field [0001] The present invention relates to an apparatus for estimating (evaluating, estimating) a tire state of a tire-mounted wheel of a vehicle and an apparatus for determining whether a tire is abnormal. Background technique [0002] Various techniques are known for estimating the state of a tire from a wheel speed signal representative of a wheel speed representing the angular velocity of the wheel on which the tire is mounted. According to a traditional method, under the premise that a fixed relationship is established between the tire pressure (the air pressure in the tire), the tire dynamic load radius and the wheel speed, a tire pressure state quantity is estimated according to the wheel speed signal for tire status. One example of the above method for estimating the tire pressure state quantity is disclosed in Japanese Patent Laid-Open Publication No. 6-286486. [0003] According to another example of the conventional method, the tire pressure state q...
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Login to View More IPC IPC(8): B60C23/06
CPCB60C23/061B60C23/06
Inventor 小岛弘义井上秀雄
Owner TOYOTA JIDOSHA KK