SYSTEM AND METHOD FOR CONTROLLING THE RELEASE OF AN AUTOMATIC PARKING BRAKE DEVICE ONBOARD AN AUTOMOBILE
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Abstract
A system controlling release of an automatic parking brake onboard an automobile, that includes a mechanism estimating torque transmitted by the clutch, a sensor measuring an inclination angle of the rolling surface, and a mechanism controlling release of the parking brake device that compares the torque transmitted by the clutch with a continuous threshold torque depending on the inclination angle of the rolling surface at an end of a vehicle stop.
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Citations
20 Claims
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1-10. -10. (canceled)
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11. A system controlling release of an automatic parking brake device, onboard an automobile, and comprising:
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means for estimating torque transmitted by a clutch; a sensor measuring a tilt angle of the rolling surface; and means for controlling release of the parking brake device that includes first means for comparing the torque transmitted by the clutch with a continuous threshold torque dependent on the tilt angle of a rolling surface at an end of a stoppage of the vehicle, wherein the threshold torque is an even function of the tilt angle of the rolling surface at the end of the stoppage of the vehicle, and comprises a first portion that decreases for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are below a first negative threshold, a second portion that is constant and positive for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are contained between the first negative threshold and a second positive threshold, and a third portion that increases for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are above the second positive threshold. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of controlling release of an automatic parking brake device onboard an automobile, comprising:
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comparing torque transmitted by a clutch with a continuous threshold torque dependent on a tilt angle of a rolling surface at an end of a stoppage of the vehicle, wherein the threshold torque is an even function of the tilt angle of the rolling surface at the end of the stoppage of the vehicle, and comprises a first portion that decreases for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are below a first negative threshold, a second portion that is constant and positive for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are contained between the first negative threshold and a second positive threshold, and a third portion that increases for values of the tilt angle of the rolling surface at the end of the stoppage of the vehicle that are above the second positive threshold.
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Specification