Automotive traction control system with feature of enabling and disabling control depending upon vehicle speed
First Claim
Patent Images
1. A traction control system for an automotive vehicle comprising:
- first sensor means for monitoring wheel speed of a first vehicular wheel for producing a first wheel speed signal having a value serving as a wheel speed parameter;
means for deriving an approximated vehicle speed value based on said wheel speed parameter;
means for comparing the first wheel speed signal value with said approximated vehicle speed value for monitoring a magnitude of wheel slip and producing a control signal to reduce driving torque to be distributed to said vehicular wheels when said first wheel speed signal value becomes greater than said approximated vehicle speed value; and
means for detecting a predetermined disabling condition based on a preselected vehicle speed parameter for disabling said traction control, in which said preselected vehicle speed parameter represents a substantially lower vehicle speed than a given low vehicle speed threshold.
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Abstract
A traction control system includes means for detecting a vehicle driving condition and disabling traction control for reducing driving torque distributed to vehicular driven wheels for avoiding wheel slippage when a predetermined vehicle driving condition is detected. In the practical control, a vehicle speed is taken as a traction control enabling/disabling criterion for disabling control while the vehicle speed is lower than a given criterion.
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Citations
17 Claims
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1. A traction control system for an automotive vehicle comprising:
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first sensor means for monitoring wheel speed of a first vehicular wheel for producing a first wheel speed signal having a value serving as a wheel speed parameter; means for deriving an approximated vehicle speed value based on said wheel speed parameter; means for comparing the first wheel speed signal value with said approximated vehicle speed value for monitoring a magnitude of wheel slip and producing a control signal to reduce driving torque to be distributed to said vehicular wheels when said first wheel speed signal value becomes greater than said approximated vehicle speed value; and means for detecting a predetermined disabling condition based on a preselected vehicle speed parameter for disabling said traction control, in which said preselected vehicle speed parameter represents a substantially lower vehicle speed than a given low vehicle speed threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A traction control system for an automotive vehicle comprising:
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first sensor means for monitoring wheel speed of a first vehicular wheel for producing a first wheel speed signal having a value serving as a first wheel speed parameter; second sensor means for monitoring wheel speed of a second vehicular wheel for producing a second wheel speed signal having a value serving as a second wheel speed parameter; means, receiving said first and second wheel speed signals and selecting one of said first and second wheel speed signals according to a predetermined schedule, for deriving an approximated vehicle speed value based on one of said first and second wheel speed parameters; means for comparing the first wheel speed signal value with said approximated vehicle speed value for monitoring a magnitude of wheel slip and producing a control signal to reduce driving torque to be distributed to said vehicular wheels when said first wheel speed signal value becomes greater than said approximated vehicle speed value; and means for comparing said approximated vehicle speed value with a given threshold value which is representative of a given low vehicle speed threshold, for producing a disabling signal for disabling reduction of driving torque which is otherwise performed in response to detection of wheel slip exceeding a given magnitude.
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17. A traction control system for an automotive vehicle comprising:
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first sensor means for monitoring wheel speed of a first vehicular wheel for producing a first wheel speed signal having a value serving as a first wheel speed parameter; second sensor means for monitoring wheel speed of a second vehicular wheel for producing a second wheel speed signal having a value serving as a second wheel speed parameter; means, receiving said first and second wheel speed signals and selecting a smaller one of said first and second wheel speed signals, for deriving an approximated vehicle speed value based on said smaller one of said first and second wheel speed parameters; means for comparing the first wheel speed signal value with said approximated vehicle speed value for monitoring a magnitude of wheel slip and producing a control signal to reduce driving torque to be distributed to said vehicular wheels when said first wheel speed signal value becomes greater than said approximated vehicle speed value; and means for comparing said approximated vehicle speed value with a given threshold value which is representative of a given low vehicle speed threshold, for producing a disabling signal for disabling reduction of driving torque which is otherwise performed in response to detection of wheel slip exceeding a given magnitude.
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Specification