Patent ID: 6385970
Filing Date: 2002-05-14
Classification: B60W,F02D,F16H

Abstract:
An apparatus for controlling load on an engine, comprising:a continuously variable transmission driven by the engine; an engine speed sensor being adapted to sense the output speed of the engine and produce an engine speed signal indicative of the engine output speed; a travel speed sensor being adapted to sense the travel speed of the machine and produce a travel speed signal indicative of the machine travel speed; and an electronic controller operative to (i) activate a modified machine speed command responsive to the engine speed falling below an underspeed value, and (ii) direct the modified machine speed command toward a subsequent underspeed value, wherein the load on the engine is decreased in response to activation of the modified machine speed command and a transmission ratio of the continuously variable transmission is modified based on the subsequent underspeed value to obtain an engine performance condition.