Patent ID: 6056657
Filing Date: 2000-05-02
Classification: B60W,F16H,Y10T

Abstract:
A method of operating a hydro-mechanical transmission system, including a hydro-mechanical transmission having an output, a mechanical multi-speed transmission driven by an engine, and a motor providing a continuously variable reversible input to said output such that the speed of said output is developed from a combination of said multi-speed transmission and said motor, comprising the steps of:driving said multi-speed transmission by said engine, and driving said output by the combination of said multi-speed transmission and said motor;approaching a desired shift point for said multi-speed transmission, and varying engine speed to result in an increase in the speed of said multi-speed transmission, with a control; andshifting said multi-speed transmission when the speed of said motor and the speed of said multi-speed transmission are appropriate to achieve a generally synchronized shift, with said control, wherein said control is operable to increase the engine speed as a shift is approached, and to vary the motor speed and the engine speed, and shift said multi-speed transmission when the motor speed and the engine speed reach a synchronized point.