Zf Active Safety US Inc.

Wenbo Yu

Shawn Hawley

Tobias Kranepuhl

A method is provided for controlling regenerative braking for a vehicle having a propulsion system, a motor, a transmission, and a clutch selectively coupling the motor to the transmission. The method includes estimating a future time at which the clutch disengages from the transmission. A rotational speed at which the clutch disengages from the transmission is calculated based on an idle speed of the propulsion system. A difference between a speed of the motor and the clutch disengage speed is monitored. A ramp down of regenerative torque on the motor is initiated when the difference is below a predetermined value and before the future clutch disengage time elapses.

Regenerative braking torque control system for launch clutch opening

A method of detecting brake fade for a vehicle brake system having wheel brakes susceptible to brake fade, includes the steps of: (a) providing a brake system including wheel brakes; and (b) determining the presence of brake fade within the vehicle system utilizing adaptive references maps, and wherein the adaptive reference maps include storing vehicle deceleration data and brake system fluid volume at different pressure points in a histogram.

Vehicle brake system with brake fade detection

A method of controlling the fluid pressure at wheel brakes of a brake system, the method comprising: (a) providing a brake system capable of delivering fluid pressure to the wheel brakes during an autonomous braking event, and wherein the brake system includes a brake pedal and sensor for sensing a driver's braking intent when applying force to the brake pedal; (b) controlling the fluid pressure at the wheel brakes at a predetermined pressure during an autonomous braking event, wherein the sensor detects no depression of the brake pedal; (c) cancelling the autonomous braking event when the sensor detects depression of the brake pedal; and (d) subsequently to step (c), the brake system enters into a handoff procedure to maintain the predetermined pressure at the wheel brakes after the sensor senses the brake pedal being depressed when a requested pressure by the driver is less than the predetermined pressure.

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Canton, MI, United States of America

Wenbo Yu