Patent ID: 6283891
Filing Date: 2001-09-04
Classification: F16H,Y10T

Abstract:
A method and control strategy for controlling upshifts in the gearing of a multiple-ratio automatic transmission for an automotive vehicle including an electronic controller and clutch and brake means for establishing torque delivery paths from an engine to a torque output shaft, the electronic controller including a manual upshift sequence operating mode having automatic upshift controls responsive to engine and transmission operating variables, the vehicle having traction wheels drivably connected to the torque output shaft, and driver-operated wheel brakes;the method and strategy comprising the steps of enabling a manual upshift mode including a control routine under the control of the driver as the vehicle brakes are applied;upshifting the transmission manually as the wheel brakes are released and the vehicle accelerates from a standing start;disabling the manual upshift control routine by applying the wheel brakes;and enabling automatic upshift controls in response to application of the wheel brakes.