Vehicle speed sensor failure detection apparatus and method for an electronic control system
First Claim
1. A vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, comprising:
- a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and
a failure detection portion for storing a vehicle speed reference level and a behavior reference level and receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level and the brake is in the OFF state, the failure detection portion generates a failure signal.
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Abstract
A vehicle speed sensor failure detection apparatus for an electronic control system having a vehicle speed sensor for generating a vehicle speed information signal indicating vehicle speed information includes a vehicle behavior detection portion, a brake sensor and a failure detection portion. If vehicle speed information generated from the vehicle speed sensor is less than or equal to a vehicle speed reference level stored in the failure detection portion, the vehicle behavior information signal generated during a predetermined period of time has a portion exceeding the behavior reference level stored in the failure detection portion and the brake is in the OFF state, the failure detection portion generates a failure signal.
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Citations
10 Claims
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1. A vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, comprising:
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a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and
a failure detection portion for storing a vehicle speed reference level and a behavior reference level and receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, wherein if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level and the brake is in the OFF state, the failure detection portion generates a failure signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A vehicle speed sensor failure detection apparatus for an electronic control system which has a vehicle speed sensor for detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information, comprising:
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a vehicle behavior detection portion for detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
a brake sensor for determining whether a brake of the vehicle is in an ON state or an OFF state and generating a brake state information signal indicating brake state information; and
a failure detection portion for storing a vehicle speed change rate reference level and a behavior reference level, receiving the vehicle speed information signal, the vehicle behavior information signal and the brake state information signal, and calculating a change rate of the vehicle speed information, wherein if the change rate of the vehicle speed information generated during a predetermined first period of time is less than or equal to the vehicle speed change rate reference level, the vehicle behavior information signal generated during a predetermined second period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state, the failure detection portion generates a failure signal.
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8. A vehicle speed sensor failure detection method for an electronic control system which stores a vehicle speed reference level and a behavior reference level, comprising the steps of:
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detecting a vehicle speed of a vehicle and generating a vehicle speed information signal indicating vehicle speed information;
detecting a behavior of the vehicle and generating a vehicle behavior information signal indicating vehicle behavior information;
determining whether a brake of the vehicle is in an ON state or an OFF state, and generating a brake state information signal indicating brake state information;
generating a failure signal, if the vehicle speed information is less than or equal to the vehicle speed reference level, the vehicle behavior information signal generated during a predetermined period of time includes a portion exceeding the behavior reference level, and the brake is in the OFF state; and
stopping a control operation of the electronic control system in response to the failure signal, the control operation of the electronic control system using the vehicle speed information. - View Dependent Claims (9, 10)
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Specification