Throttle opening control system for automotive engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsKouji Sasajima, Takamichi Shimada
Life of this patent
Estimating the term…
Abstract
A control system for controlling the throttle opening of an engine of an automobile has a stepping motor for actuating a throttle valve disposed in an intake passage of the engine to control the throttle opening, an accelerator operation detecting unit for detecting the amount of operation of an accelerator pedal operated on by the driver of the automobile, an engine operating condition detecting unit for detecting an operating condition of the engine, and a controller for controlling the stepping motor based on detected values from the accelerator operation detecting unit and the engine operating condition detecting unit.
Claims6
A control system for controlling the throttle opening of an engine of an automobile, comprising:
- a stepping motor for actuating a throttle valve disposed in an intake passage of the engine to control the throttle opening;
- accelerator operation detecting means for detecting the amount of operation of accelerator means operated on by the driver of the automobile;
- engine operating condition detecting means for detecting an operating condition of said engine;
- a controller for controlling said stepping motor based on detected values from said accelerator operation detecting means and said engine operating condition detecting means;
- said controller comprising:
- target throttle opening setting means for setting a target throttle opening for the engine based on the detected values from said accelerator operation detecting means and said engine operating condition detecting means;
- basic command pulse calculating means for calculating, in each periodic calculation period used by the controller, command pulses to be applied to the stepping motor which are required to equalize an actual throttle opening with said target throttle opening;
- corrected command pulse calculating means for calculating a pulse quiescent time interval from the completion of outputting of calculated command pulses which have been outputted from the start of a next calculation period, to the end of the calculation period, and correcting the command pulses such that if the calculated pulse quiescent time interval is of a value within a predetermined time range in which said stepping motor would lose steps, then the calculated pulse quiescent time interval is corrected into a value outside said predetermined time range;
- and
- means for outputting the command pulses corrected by said corrected command pulse calculating means and determined in each calculation period at an initial stage of each calculation period to control said stepping motor for controlling the throttle opening.
Dependencies are inferred from the claim text.