Patent ID: 7848870

Claim:
A control apparatus for a negative pressure generating apparatus, comprising: an ejector that generates a negative pressure whose magnitude is larger than that of a negative pressure to be taken from an intake passage in an intake system for an internal combustion engine provided in a vehicle; a state change device that makes the ejector function and stop functioning; and a prohibition control device that prohibits the state change device from making the ejector function, when the vehicle is in a transiently decelerated state, where a change in an intake pipe negative pressure lags behind a change in an opening degree of a throttle valve, in a control in which the state change device makes the ejector function when the negative pressure to be taken from the intake passage is a negative value larger than a predetermined value, and the opening degree of the throttle valve provided in the intake passage is smaller than a predetermined opening degree, wherein the predetermined opening degree is close to, and larger than the opening degree of the throttle valve when the internal combustion engine is idling, and the predetermined opening degree is used to make the ejector function when the internal combustion engine is idling.