Method of detecting vehicle speed sensor failure
First Claim
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1. A method for detecting vehicle speed sensor failure, comprising:
- determining whether a vehicle speed value is below a maximum threshold speed value;
determining whether a fueling rate value is above a minimum threshold fueling value;
determining whether an engine speed value is above a minimum threshold rpm value;
determining whether the vehicle transmission is in neutral;
determining that the vehicle speed sensor has failed when the vehicle speed value is below the maximum threshold speed value, the fueling rate value is above the minimum threshold fueling value, the engine speed is above a minimum threshold rpm value, and that the transmission is not in neutral; and
logging a fault code based upon the determination that the vehicle speed sensor has failed.
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Abstract
A method of detecting vehicle speed sensor failures is disclosed. The method is intended to prevent or discourage tampering with a vehicle'"'"'s speed limiting system. The method includes the steps of determining whether the transmission is in neutral or whether the transmission is in its converter mode to prevent false indications of speed sensor failure under certain circumstances.
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Citations
16 Claims
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1. A method for detecting vehicle speed sensor failure, comprising:
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determining whether a vehicle speed value is below a maximum threshold speed value; determining whether a fueling rate value is above a minimum threshold fueling value; determining whether an engine speed value is above a minimum threshold rpm value; determining whether the vehicle transmission is in neutral; determining that the vehicle speed sensor has failed when the vehicle speed value is below the maximum threshold speed value, the fueling rate value is above the minimum threshold fueling value, the engine speed is above a minimum threshold rpm value, and that the transmission is not in neutral; and logging a fault code based upon the determination that the vehicle speed sensor has failed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for detecting failure of a vehicle speed sensor, comprising:
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determining whether a vehicle speed value is below a maximum threshold speed value; determining whether a fueling rate value is above a minimum threshold fueling value; determining whether an engine speed value is above a minimum threshold value; determining whether the vehicle transmission is in a converter mode; determining that the vehicle speed sensor has failed when the vehicle speed value is below a maximum threshold speed value, the fueling rate value is above a minimum threshold fueling value, the engine speed value is above a minimum threshold value, and the transmission is not in the converter mode; and logging a fault code based upon the determination that the speed sensor has failed and further comprises enabling a warning signal. - View Dependent Claims (9)
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10. A method for detecting failure of a vehicle speed sensor, comprising:
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determining whether a vehicle speed value is below a maximum threshold speed value; determining whether an engine speed value is above a minimum threshold value; determining whether the vehicle transmission is in neutral; determining whether the vehicle transmission is in a converter mode; determining that the vehicle speed sensor is in a failure mode based upon the vehicle speed value being below the maximum threshold speed value, the engine speed value being above a minimum threshold value, the transmission being not in neutral, and the transmission not being in the converter mode; and logging a fault code in an engine controller based upon the determination that the speed sensor is in the failure mode. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification