Patent ID: 7778760

Claim:
A driving amount controller for controlling a driving amount of a controlled system by way of an output of a motor, comprising: a target driving amount input device adapted to input a target driving amount DTHR for said controlled system; and an ECU adapted to transmit to said motor a control signal for controlling the output of said motor with an output characteristic according to said target driving amount DTHR, wherein said ECU is adapted to add to said control signal a damping output Udamp for suppressing an overshoot of an actual driving amount relative to said target driving amount DTHR for said controlled system at a time of generating said control signal, and reduce said damping output Udamp only part way to zero when a switching function value σ in sliding mode control is near zero, wherein U damp is defined by the following formula (6): U damp[ k ]=− K damp·(σ[ k ]−σ[ k− 1]/ b 1 (6), wherein Kdamp is a gain characteristic value defined by the following formula (7) K damp= T — K dump1 ·T — K dump2 (7), wherein T_Kdump1 is a positive gain characteristic value which is enlarged when the target opening amount DTHR of the control system exceeds a positive predetermined value s, and wherein T_Kdump2 is a positive gain characteristic value which is reduced in an equivalent linear manner when the switching function value σ is positive and in the vicinity of zero, and also when the switching function value σ is negative and in the vicinity of zero.