Throttle valve controller for internal combustion engine

Claim 1

A throttle valve control apparatus for controlling a degree of opening of a throttle valve disposed in an intake system of an internal combustion engine, comprising: accelerator actuation detection means for producing an output in accordance with an actuation position of an accelerator pedal, setting means for setting a target degree of opening of the throttle valve in accordance with the actuation position of the accelerator pedal detected by the accelerator actuation detection means, throttle valve opening degree detection means for producing an output in accordance with an actual degree of opening of the throttle valve, drive means for driving the throttle valve in a direction such as to reduce an amount of deviation between the actual degree of opening of the throttle valve as detected by the throttle valve opening degree detection means and the target degree of opening, and command means for issuing a characteristic command to specify a requisite target opening degree characteristic; wherein said setting means sets a reference degree of opening of the throttle valve in accordance with the actuation position of the accelerator pedal by utilizing a reference opening degree characteristic and sets a boundary degree of opening of the throttle valve in accordance with the actuation position of the accelerator pedal by utilizing at least one of an upper limit opening degree and a lower limit opening degree of the throttle valve; and wherein the target degree of opening is computed from a relationship between the reference degree of opening and the boundary degree of opening which have thus been respectively set by said setting means, in conjunction with the contents of the characteristic command.