Throttle valve control apparatus of vehicle
AssigneeNippondenso Co., Ltd.
InventorsToshiaki Kikuchi, Shosuke Suzuki
Life of this patent
Estimating the term…
Abstract
A throttle control system reliably determines failure of a throttle valve driving system. During engine idling, a throttle valve is opened and closed by an actuator. A central processing unit generates a pulse-like drive signal to the actuator through a back-up integrated circuit. When the frequency of the drive signal exceeds a predetermined value, the back-up integrated circuit determines that a failure in the central processing unit has occurred. Since this determination is based on the frequency of the drive signal, a driving system failure can be reliably detected even using pulse-like signals.
Claims10
A throttle valve control apparatus for detecting an idling state of an engine of a vehicle and for controlling a throttle valve to a predetermined opening degree upon idling, comprising:
- actuator means for opening or closing the throttle valve;
- driving means for generating a drive signal to said actuator means in a pulse-like manner;
- and
- failure determining means for determining the occurrence of a failure of said driving means when a frequency of said drive signal exceeds a predetermined value, said predetermined value being representative of a drive signal frequency of said apparatus in a non-failure state.
A throttle valve control apparatus for detecting an idling state of an engine of a vehicle and for controlling a throttle valve to a predetermined opening degree upon idling, comprising:
- actuator means for opening or closing said throttle valve;
- driving means for generating a drive signal to said actuator means in a pulse-like manner;
- drive instructing means for generating a drive instruction signal to said driving means;
- and
- failure determining means for comparing phases of said drive instruction signal and said drive signal and for determining the occurrence of a failure of said driving means when said drive instruction signal phase and said drive signal phase do not coincide.
A throttle valve control apparatus for detecting an idling state of an engine of a vehicle and for controlling a throttle valve to a predetermined opening degree upon idling, comprising:
- actuator means for opening or closing said throttle valve;
- driving means for generating a drive signal to said actuator means in a pulse-like manner;
- and
- failure determining means for determining the occurrence of a failure of said driving means when a pulse length of the drive signal exceeds a predetermined value and for generating to the actuator means a reverse operation signal of a pulse length that is equal to a length to return an amount deviated by said pulse length to a state before it is deviated, said predetermined value representing a duration of a drive signal from said apparatus in a non-failure state.
Dependencies are inferred from the claim text.