Patent ID: 7885737
Filing Date: 2011-02-08
Classification: B60K,B60L,B60W,Y02T,Y10S,Y10T

Abstract:
1. A hybrid vehicle drive control system for controlling an engine, a motor/generator and a clutch in a vehicle drivetrain, the clutch located between the engine and the motor/generator and having a controllable torque transfer capacity, the control system comprising: a controller configured to selectively operate the vehicle in a hybrid drive mode in which the clutch is engaged and in an electric drive mode in which the clutch is disengaged, the controller being further configured select a predetermined mode transition pattern for disengaging the clutch and stopping the engine from a plurality of predetermined mode transition patterns while a driving mode is changed from the hybrid drive mode to the electric drive mode based on a condition indicative of a change in driving force of the vehicle, the plurality of mode transition patterns including a first pattern that disengages the clutch prior to stopping the engine, a second pattern that stops the engine prior to disengaging the clutch, and a third pattern that simultaneously stops the engine and disengages the clutch.