Vehicle power flow analysis to distinguish between internal faults and external forces
First Claim
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1. A method of analyzing vehicle parameters to distinguish between internal faults and external forces for a vehicle having an electric motor drive system operable to hold the vehicle stationary by applying a holding torque with the electric motor drive system without application of a braking system, comprising:
- determining if there is an unexpected significant rate of change in vehicle acceleration;
based upon a determination that there is an unexpected rate of change in vehicle acceleration, determining whether there is a corresponding unexpected change in electric motor drive system holding torque above a predetermined level;
based upon a determination that there is an unexpected change in electric motor drive system holding torque above a predetermined level, determining if a direction of the change in electric motor drive system holding torque is in a same direction as vehicle travel;
based upon a determination that the direction of the change in electric motor drive system holding torque is in a same direction as vehicle travel, taking predetermined measures for evaluating a potential electric motor drive system fault scenario including at least one of bringing the vehicle to a stop and/or disabling the vehicle operation; and
based upon a determination that the direction of the change in electric motor drive system holding torque is in an opposite direction as vehicle travel, taking predetermined measures for a potential vehicle crash scenario including allowing the vehicle to continue to operate, wherein the predetermined measures for a potential vehicle crash scenario differ from the predetermined measures for evaluating a potential electric motor drive system fault scenario.
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Abstract
A method of analyzing vehicle parameters to distinguish between whether an unexpected vehicle acceleration is due to an internal fault or external forces. The method uses a magnitude and direction of a change in acceleration for evaluating whether the unexpected acceleration is due to a potential system fault scenario or a potential crash scenario.
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Citations
3 Claims
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1. A method of analyzing vehicle parameters to distinguish between internal faults and external forces for a vehicle having an electric motor drive system operable to hold the vehicle stationary by applying a holding torque with the electric motor drive system without application of a braking system, comprising:
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determining if there is an unexpected significant rate of change in vehicle acceleration; based upon a determination that there is an unexpected rate of change in vehicle acceleration, determining whether there is a corresponding unexpected change in electric motor drive system holding torque above a predetermined level; based upon a determination that there is an unexpected change in electric motor drive system holding torque above a predetermined level, determining if a direction of the change in electric motor drive system holding torque is in a same direction as vehicle travel; based upon a determination that the direction of the change in electric motor drive system holding torque is in a same direction as vehicle travel, taking predetermined measures for evaluating a potential electric motor drive system fault scenario including at least one of bringing the vehicle to a stop and/or disabling the vehicle operation; and based upon a determination that the direction of the change in electric motor drive system holding torque is in an opposite direction as vehicle travel, taking predetermined measures for a potential vehicle crash scenario including allowing the vehicle to continue to operate, wherein the predetermined measures for a potential vehicle crash scenario differ from the predetermined measures for evaluating a potential electric motor drive system fault scenario. - View Dependent Claims (2, 3)
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Specification