Apparatus for detecting anomaly of wheel speed sensors
First Claim
1. A wheel-speed-sensor-anomaly detection apparatus for a vehicle equipped with wheel speed sensors for detecting rotational speeds of respective wheels, comprising:
- anomaly detection means for detecting anomaly of the wheel speed sensors on the basis of at least rotational speeds of the wheels detected by the wheel speed sensors;
gas-pressure-decrease detection means for detecting a decrease in tire gas pressure of each wheel; and
restriction means for imposing a restriction on the wheel-speed-sensor-anomaly detection operation of the anomaly detection means when a decrease in the tire gas pressure is detected.
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Accused Products
Abstract
A wheel-speed-sensor-anomaly detection apparatus detects anomaly of wheel speed sensors of a vehicle. When a difference between the minimum wheel speed among detected wheel speeds and the smallest value among the remaining wheel speeds is greater than a predetermined threshold value, in principle, a wheel speed sensor of the wheel corresponding to the minimum wheel speed is determined to be anomalous. Meanwhile, when a wheel having a lowered tire air pressure (air-pressure-lowered wheel) is present and a road surface on which the vehicle is currently traveling is a low-μ road surface, the operation of detecting anomaly of the wheel speed sensors is prohibited. This operation reliably prevents erroneous detection of anomaly of the wheel speed sensor of the air-pressure-lowered wheel, which erroneous detection would otherwise occur due to the locking tendency of the air-pressure-lowered wheel occurring because of decreased tire air pressure, in particular, on a low-μ road surface.
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Citations
7 Claims
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1. A wheel-speed-sensor-anomaly detection apparatus for a vehicle equipped with wheel speed sensors for detecting rotational speeds of respective wheels, comprising:
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anomaly detection means for detecting anomaly of the wheel speed sensors on the basis of at least rotational speeds of the wheels detected by the wheel speed sensors;
gas-pressure-decrease detection means for detecting a decrease in tire gas pressure of each wheel; and
restriction means for imposing a restriction on the wheel-speed-sensor-anomaly detection operation of the anomaly detection means when a decrease in the tire gas pressure is detected. - View Dependent Claims (2, 3, 4, 5)
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6. A wheel-speed-sensor-anomaly detection program for a vehicle equipped with wheel speed sensors for detecting rotational speeds of respective wheels, comprising:
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an anomaly detection step of detecting anomaly of the wheel speed sensors on the basis of at least rotational speeds of the wheels detected by the wheel speed sensors;
a gas-pressure-decrease detection step of detecting a decrease in tire gas pressure of each wheel; and
a restriction step of imposing a restriction on the wheel-speed-sensor-anomaly detection operation of the anomaly detection step when a decrease in the tire gas pressure is detected.
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7. A wheel speed detection apparatus for a vehicle equipped with assemblies of a wheel and a tire as well as respective wheel speed sensors, comprising:
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first detection means for detecting anomaly of the wheel speed sensors on the basis of wheel speed detected by the wheel speed sensors;
second detection means for detecting decrease of air pressure in the tires; and
restriction means for restricting to detect anomaly by the first detection means in respect of a specific wheel when the decrease of the air pressure of the tire concerning the specific wheel is detected by the second detection means.
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Specification