Method of feedback-controlling idling speed of internal combustion engine
US4570592A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 22, 1985 |
| Grant date | Feb 18, 1986 |
| Priority date | — |
| Expiry date | Jan 22, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D41/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method of feedback controlling idling speed in an internal combustion engine having an intake air amount control unit for controlling the amount of air intake. During an idling operation, the intake air amount control unit is feedback controlled as a function of the deviation of actual engine speed from a target engine speed, and when the engine speed becomes lower than a predetermined speed while said engine is decelerating, the intake air amount control unit is set to an initial value prior to or at the start of the feedback control. The method includes the steps of detecting the engine speed; detecting the rate of deceleration of the engine when the detected engine speed becomes lower than the predetermined speed while the engine is decelerating; and setting the initial value of the intake air amount control unit as a function of the rate of deceleration. The intake air amount control unit is maintained at the initial value during the period of time from when the engine speed becomes lower than the predetermined speed to when feedback control starts.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.