Engine throttle control with varying control constants
AssigneeNippondenso Co., Ltd.
InventorsKazunari Shirai, Hidemasa Miyano, Shigeru Kamio, Yoshimasa Nakaya
Life of this patent
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Abstract
ECU performs a feedback control on a d.c. motor by a PID feedback control thereby to reduce errors between an actual throttle opening and a command throttle opening. PID control constants Kp, Ti and Td in the PID control are determined in accordance with operating conditions of a vehicle, such as engine idle speed control condition, vehicle traction control condition, vehicle cruise control condition and the like.
Claims21
A throttle control apparatus for an internal combustion engine which controls a throttle valve opening through an electric actuator in accordance with accelerator pedal depression, said apparatus comprising:
- target opening setting means for setting a target opening of said throttle valve in accordance with accelerator pedal depression;
- deviation calculating means for calculating deviation of actual throttle valve opening from said target opening;
- throttle valve control means for controlling said throttle valve through said electric actuator by performing a proportional, integral and derivative control on said calculated deviation;
- and
- control constant determining means for determining control constants of said proportional, integral and derivative control in accordance with vehicle operating conditions, at least one of said constants of said proportional control and said derivative control being varied between a normal and a specified other vehicle operating condition.
An electronic throttle control method for an engine having a throttle valve driven under both a normal control mode and a specified other control mode including at least one of an idle speed control mode, a traction control mode and a cruise control mode, said electronic throttle control method comprising the steps of:
- determining deviation between throttle opening and a target throttle opening determined by accelerator position;
- determining throttle valve control by performing proportional, integral and derivative calculation on said deviation;
- and
- varying at least one of gains of said proportional, said integral and said derivative calculations when the engine passes between said normal control mode and said specified other control mode.
Dependencies are inferred from the claim text.