Idling speed control method and apparatus for an internal combustion engine

Patent 5495835 Issued on March 5, 1996. Estimated Expiration Date:

February 23, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Method of feedback controlling engine idle speed
Patent #: 4492195
Issued on: 01/08/1985
Inventor: Takahashi , et al.

Idle operation control for internal combustion engines
Patent #: 4509477
Issued on: 04/09/1985
Inventor: Takao , et al.

Method for controlling the supply of fuel for an internal combustion engine
Patent #: 4709334
Issued on: 11/24/1987
Inventor: Abe , et al.

Method for predicting R-step ahead engine state measurements Patent #: 5094213
Issued on: 03/10/1992
Inventor: Dudek, et al.

Inventor

Ueda, Katsunori

Assignee

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Application

No. 167857 filed on 02/23/1994

US Classes:

123/339.11, By regulating spark ignition timing123/339.21And integral or derivative control

Examiners

Primary: Argenbright, Tony M.

Foreign Patent References

59-120752 JP. 07/12/1984
3-36145 JP. 05/12/1991
3-111652 JP. 05/12/1991
4-27768 JP. 01/12/1992
4-50446 JP. 02/12/1992

International Classes

F02D 041/16
F02D 043/04

Foreign Application Priority Data

1992-04-24 JP

Abstract

In an idling speed control method for adjusting the amount of intake air supplied to an internal combustion engine so that the engine speed matches a target speed when the engine is idling, a value of a stroke period or speed of the engine is detected. Further, a target torque improvement rate Mi, indicative of excess or deficiency of an engine output torque caused by a response delay in an intake system of the engine, is predicted in accordance with the detected value of the stroke period. Also, in accordance with the predicted torque improvement rate Mi, an ignition timing is delayed or advanced and the fuel supply quantity is increased or decreased to make an air-fuel ratio rich or lean. This eliminates the excess or deficiency of the intake air supply due to the response delay in the intake system relative to fluctuations in idling speed, thereby permitting stable idling even at low speed.