Patent ID: 7222012
Filing Date: 2007-05-22
Classification: B60W,Y10T

Abstract:
1. A powertrain braking system for a vehicle, comprising: an powerplant that is regulated to provide a desired powerplant torque; a transmission that transfers said desired powerplant torque at one of a plurality of gear ratios to provide a desired axle torque; and a control module that calculates an axle torque command based on a powertrain braking request, that determines a shift command based on said powertrain braking request and that controls said powerplant based on said axle torque command and said transmission based on said shift command to achieve a desired deceleration of said vehicle that corresponds to said powertrain braking request, wherein said powertrain braking request includes an absolute axle torque request based on at least one of a delta torque request and an absolute torque request, and wherein said control module further determines a minimum axle torque based on a range of said transmission and converts said delta torque request into an absolute delta torque request based on said minimum axle torque.