Patent ID: 6393350
Filing Date: 2002-05-21
Classification: B60W,F02D,F16H,Y02T,Y10T

Abstract:
A control system for an automotive vehicle powertrain comprising a throttle-controlled engine and a multiple-ratio automatic transmission, the transmission having multiple-ratio gearing and fluid pressure-operated clutches and brakes for establishing and disestablishing plural torque flow paths through the gearing;an electronic accelerator pedal under the control of a vehicle operator for measuring an operator request for engine torque; an electronic throttle actuator for controlling engine throttle position; an electronic powertrain controller including a processor unit with stored algorithms for computing a leading indicator of engine torque as a function of electronic accelerator pedal position; the electronic throttle actuator communicating with the powertrain controller whereby the leading indicator of engine torque is distributed to the electronic throttle actuator to effect a fast change of engine throttle position in response to a request for engine torque; the electronic powertrain controller including a transmission control module for controlling fluid pressure for the transmission clutches and brakes, the leading indicator of engine torque computed by the powertrain controller being distributed to the transmission control module whereby the pressure for the transmission clutches and brakes is maintained at an optimum level for smooth ratio changes and improved transmission operating efficiency.