Patent ID: 6449548
Filing Date: 2002-09-10
Classification: B60W,Y10T

Abstract:
An electronic control system for controlling ratio changes in a multiple-ratio transmission for a powertrain for a wheeled vehicle, the powertrain including a throttle-controlled internal combustion engine;the transmission including a hydrokinetic torque converter having an impeller connected to the engine and a turbine, multiple-ratio gearing and a torque output shaft connecting the turbine to vehicle traction wheels: the electronic control system comprising: an engine speed sensor for measuring turbine speed; a turbine speed sensor for measuring turbine speed; a torque output shaft speed sensor for measuring torque output shaft speed; a driver-controlled accelerator pedal for establishing a commanded engine throttle position; a pedal position sensor for establishing a pedal position signal; and an electronic controller having a first portion in communication with the pedal position sensor, the engine speed sensor, the turbine speed sensor and the torque output shaft speed sensor, and comprising memory storage registers and a processor unit for calculating a commanded ratio rate during a ratio change interval in accordance with instruction in the memory storage registers based on speed data from the sensors, the calculations of the processor occurring during repetitive control loops of the controller; the processor further calculating actual ratio rate during a ratio change interval and determining an error between the commanded ratio rate and the actual ratio rate; the controller comprising a second portion having a processor unit for calculating a commanded engine torque as a function of the ratio rate error; the controller comprising a third portion having a processor for calculating engine control parameters in a closed-loop fashion as a function of said commanded engine torque, one of the control parameters being commanded engine throttle position.