Fault diagnosis apparatus and method of variable intake system

摘要

An engine speed detecting means for outputting a pulse signal of a corresponding cycle according to a rotation operation of the rank shaft; An intake air amount sensing means for sensing an amount of intake air varying depending on an amount of opening of a throttle valve interlocked with an accelerator pedal and an opening amount of a throttle valve interlocked with an accelerator pedal; The variable throttle opening degree determining means determines whether the variable intake system is operating by sensing the number of revolutions of the engine, the throttle opening amount and the intake air amount according to the running state of the vehicle, and outputs a variable intake system driving signal. The amount of opening and the amount of intake air are detected and when the variable intake system operates normally, the corresponding engine rotation speed, throttle opening amount and intake air amount are read, and the difference amount between the sensed intake air amount and the read intake air amount is calculated And then outputs a malfunction warning signal when it is determined that the variable intake system is not operating normally when the calculated difference amount is equal to or greater than the set value; And an operating state display means for indicating to the driver that a malfunction has occurred in the variable intake system. The fault diagnosis apparatus of the variable intake system includes an engine speed, a throttle opening amount and an intake air amount measured when the variable intake system is operated, The operating state of the variable intake system is determined and displayed according to the difference between the engine speed corresponding to the normal operation of the variable intake system and the amount of intake air according to the throttle opening amount so that the driver can grasp the operating state of the variable intake system So that it is possible to quickly implement the corresponding method, and the method can be provided.