Enhanced yaw stability control to mitigate a vehicle's abnormal yaw motion due to a disturbance force applied to vehicle body
First Claim
1. A yaw stability control system for a vehicle comprising:
- at least one vehicle status sensor generating at least one sensor signal;
at least one driver input sensor generating at least one input signal;
a yaw rate sensor generating a yaw gradient signal that reflects a yaw rate difference between sequential sampling instants;
a lateral acceleration sensor generating a lateral acceleration signal;
a controller disabling normal yaw stability control operation associated with tire force differentials and enabling a body-force-disturbance yaw stability control operation, comprising at least partially reducing normal yaw stability control response functions associated with the at least one input signal and performing body-force-disturbance yaw stability control functions in response to the at least one sensor signal; and
the controller incrementally increasing brake pressure greater than that applied by normal yaw stability control operation in response to the yaw gradient signal and the lateral acceleration signal.
3 Assignments
0 Petitions
Accused Products
Abstract
An enhanced stability control system (200) for a vehicle includes a vehicle status sensor that generates a sensor signal. A driver input sensor that generates an input signal. A controller (214) may disable normal yaw stability control operation and enable body-force-disturbance (BFD) yaw stability control (YSC) operation, which includes at least partially reducing response functions of the normal yaw stability control associated with the input signal, in response to the sensor signal and performing BFD-YSC functions to achieve desired control performance upon the detection of BFD reception. The controller (214) may also or alternatively compare the sensor signal to a threshold and detect an improperly functioning/inoperative vehicle status sensor. The controller (214) disregards information associated with the improperly functioning/inoperative vehicle status sensor, and continues to perform enhanced yaw stability control operations.
31 Citations
16 Claims
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1. A yaw stability control system for a vehicle comprising:
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at least one vehicle status sensor generating at least one sensor signal; at least one driver input sensor generating at least one input signal; a yaw rate sensor generating a yaw gradient signal that reflects a yaw rate difference between sequential sampling instants; a lateral acceleration sensor generating a lateral acceleration signal; a controller disabling normal yaw stability control operation associated with tire force differentials and enabling a body-force-disturbance yaw stability control operation, comprising at least partially reducing normal yaw stability control response functions associated with the at least one input signal and performing body-force-disturbance yaw stability control functions in response to the at least one sensor signal; and the controller incrementally increasing brake pressure greater than that applied by normal yaw stability control operation in response to the yaw gradient signal and the lateral acceleration signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 9, 10, 11, 12)
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8. A method of controlling a yaw stability control system for a vehicle comprising:
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generating at least one vehicle status sensor signal; generating at least one vehicle operator input signal; generating a yaw gradient signal that reflects the yaw rate difference between sequential sampling time instances; generating a longitudinal acceleration signal; generating a longitudinal acceleration gradient signal that reflects the longitudinal acceleration difference between sequential sampling time instants; comparing the at least one vehicle status sensor signal to a first threshold set for yaw stability control system normal affective operation; overriding normal operation of the yaw stability control system when the at least one threshold is exceeded; at least partially reducing response functions associated with the at least one input signal; detecting a body-force-disturbance when the magnitude of the longitudinal acceleration is greater than a first threshold, the magnitude of the longitudinal acceleration gradient is greater than a second threshold and the magnitude of the yaw gradient signal is greater than a third threshold; disabling normal yaw stability control and enabling an enhanced body-force-disturbance yaw stability control in response to the detection; and increasing brake pressure greater than that applied by a normal yaw stability control function. - View Dependent Claims (13, 14, 15, 16)
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Specification