Method of and device for detecting tire pressure drop
First Claim
1. A tire pressure drop detecting method, comprising the steps of:
- detecting a rotational angular velocity of a tire provided for a vehicle,detecting a front/rear acceleration of the vehicle,discriminating whether the vehicle is in a predetermined decelerated state or not, based on the detected front/rear acceleration of the vehicle, andjudging whether the pneumatic pressure of the tire has dropped, based on the detected rotational angular velocity, only under the condition that it is discriminated that the vehicle is in the predetermined decelerated state.
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Abstract
A tire pressure drop detecting method, capable of accurately detecting whether the pneumatic pressure of a tire has dropped even if a large driving torque is exerted on the tires. The rotational angular velocities of tires provided for a vehicle are detected and a front/rear acceleration of the vehicle is detected, and then it is discriminated whether the vehicle is in a predetermined decelerated state or not, based on the detected front/rear acceleration of the vehicle. If the vehicle is in the predetermined decelerated state, it is judged whether the pneumatic pressure of the tires has dropped, based on the detected rotational angular velocities. The pneumatic pressure drop of the tire is judged only when the vehicle is in the decelerated state where a difference between the rotational angular velocity of the tire at the time of pneumatic pressure drop and that at the time of a normal inner pressure is relatively large.
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Citations
30 Claims
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1. A tire pressure drop detecting method, comprising the steps of:
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detecting a rotational angular velocity of a tire provided for a vehicle, detecting a front/rear acceleration of the vehicle, discriminating whether the vehicle is in a predetermined decelerated state or not, based on the detected front/rear acceleration of the vehicle, and judging whether the pneumatic pressure of the tire has dropped, based on the detected rotational angular velocity, only under the condition that it is discriminated that the vehicle is in the predetermined decelerated state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A tire pressure drop detecting device, comprising:
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rotational angular velocity detecting means for detecting a rotational angular velocity of a tire provided for a vehicle, acceleration detecting means for detecting a front/rear acceleration of the vehicle, decelerated state discriminating means for discriminating whether the vehicle is in a predetermined decelerated state, based on the front/rear acceleration of the vehicle detected by the acceleration detecting means, and pneumatic pressure drop judging means for judging whether the pneumatic pressure of the tire has dropped, based on the rotational angular velocity detected by the rotational angular velocity detecting means, only under the condition that it is discriminated by the decelerated state discriminating means that the vehicle is in the predetermined decelerated state. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification