Apparatus for detecting abnormality of a vehicle sensor and method
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsToshinori Okita, Akira Tanaka, Yoshiyuki Yasui, Mamoru Sawada, Noboru Sugiura
Life of this patent
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Abstract
An apparatus for detecting abnormality of a vehicle sensor and a method are provided. The apparatus is capable of preventing erroneous detection of abnormalities of sensors. The apparatus has a grip degree detecting device for detecting grip degree of a wheel of the vehicle with respect to a road surface. In a case in which the grip degree is lower than a predetermined degree, detection for presence of an abnormality of a yaw rate sensor, a cross acceleration sensor and a steering angle sensor are prohibited.
Claims18
An apparatus for detecting abnormality of a vehicle sensor comprising:
- a first sensor for detecting an operational state of a vehicle;
- a second sensor, which is different from the first sensor, for detecting the operational state of the vehicle;
- an abnormality detecting device for detecting for presence of an abnormality of the first sensor on the basis of a predefined operational state of the vehicle detected by the first sensor and the predefined operational state of the vehicle estimated on the basis of an output of the second sensor;
- a grip degree detecting device for detecting grip degree of a wheel of the vehicle with respect to a road surface;
- and
- a prohibiting device for prohibiting detection for presence of an abnormality of the first sensor by the abnormality detecting device in at least one case of a case in which the grip degree is lower than a predetermined degree and a case in which a cross-gradient of the road surface is equal to or more than a predetermined value.
A method for detecting abnormality of a vehicle sensor comprising:
- detecting an operational state of a vehicle by a first sensor;
- detecting the operational state of the vehicle by a second sensor, which is different from the first sensor;
- detecting presence of an abnormality of the first sensor on the basis of a predefined operational state of the vehicle detected by the first sensor and the predefined operational state of the vehicle estimated on the basis of an output of the second sensor;
- detecting grip degree of a wheel of the vehicle with respect to a road surface;
- and
- prohibiting detection for presence of an abnormality of the first sensor in at least one case of a case in which the grip degree is lower than a predetermined degree and a case in which a cross-gradient of the road surface is equal to or more than a predetermined value.
An apparatus for detecting abnormality of a vehicle sensor comprising:
- a first sensor for detecting an operational state of a vehicle;
- a second sensor, which is different from the first sensor, for detecting the operational state of the vehicle;
- an abnormality detecting device for detecting for presence of an abnormality of the first sensor on the basis of a predefined operational state of the vehicle detected by the first sensor and the predefined operational state of the vehicle estimated on the basis of an output of the second sensor;
- a grip degree detecting device for detecting grip degree of a wheel of the vehicle with respect to a road surface;
- and
- a prohibiting device for prohibiting detection for presence of an abnormality of the first sensor by the abnormality detecting device in at least one case of a case in which the grip degree is lower than a predetermined degree and a case in which a cross-gradient of the road surface is equal to or more than a predetermined value,
- wherein the first sensor is at least one of a cross-acceleration sensor, a yaw rate sensor and a steering angle sensor, and the second sensor is a wheel speed sensor.
Dependencies are inferred from the claim text.