Patent ID: 6945224

Claim:
An intake air amount control apparatus for a vehicle engine provided with a brake booster for assuring a master vacuum negative pressure by using a negative pressure of said engine, comprising: an intake valve; a variable valve mechanism which varies a lift amount of said intake valve; an intake throttle valve disposed on an upstream side of said intake valve; an actuator opening/closing said intake throttle valve; an operating condition detector detecting operating conditions of said engine; and a control unit that receives detection signals from said operating condition detector and also outputs control signals to said variable valve mechanism and said actuator, wherein said control unit diagnoses whether or not said variable valve mechanism is failed, and controls an intake air flow amount of said engine by controlling the lift amount of said intake valve and also controls an intake negative pressure of said engine to be constant by controlling an opening degree of said intake throttle valve, when said variable valve mechanism is normal, while stops the driving of said variable valve mechanism and controls the opening of said intake throttle valve to control the intake air flow amount of said engine, and also, restricts the opening degree of said intake throttle valve for controlling said intake air flow amount to an upper limit value or a value less than the upper limit value, when said variable valve mechanism is failed.