Patent ID: 6367449
Filing Date: 2002-04-09
Classification: F02D

Abstract:
A sliding mode control unit of an electronically controlled throttle device, for electronically controlling the opening of a throttle valve mounted in an intake system of an engine through a sliding mode control, comprisinga switching function proportional portion computing means for computing a control amount portion proportional to a switching function utilized in said sliding mode control; a nonlinear spring torque portion computing means for computing a control amount portion corresponding to a nonlinear spring torque of a return spring urging said throttle valve in a direction to reduce the opening of said throttle valve; a control amount computing means for computing a control amount of the opening of said throttle valve including the control amount portion proportional to said switching function and the control amount portion corresponding to said nonlinear spring torque; and a sliding mode control means for performing the sliding mode control of said throttle valve opening based on said computed control amount.