Patent ID: 6231479
Filing Date: 2001-05-15
Classification: F16H,Y10T

Abstract:
A control system for an automatic power transmission having multiple-ratio gearing elements for delivering torque from a throttle controlled interval combustion engine to a driven shaft in an automotive vehicle driveline;pressure actuated clutch means and brake means for controlling relative motion of the gearing elements to establish multiple forward driving torque flow paths and a reverse drive torque flow path, the clutch means including a torque input shaft;means for measuring engine torque input to the system;means for measuring torque input shaft acceleration;an electronic processor means for activating and deactivating the clutch means and brake means including memory registers that store predetermined functional relationships between engagement time for the clutch means and engine neutral idle torque and between engine throttle position and engine torque input to the system;means for establishing a desired engine torque input to the system using engine throttle torque and engine neutral idle torque;means for establishing rotary inertia torque as a function of measured engine torque;means for computing the sum of the values for rotary inertia torque and the measured engine torque, desired torque being compared to the sum to determine an error between them; andmeans for conveying the error to an incremental clutch pressure value to complete engagement of the clutch means quickly with minimal driveline torsional disturbance.