Idling rotational speed control system for internal combustion engines
US5614666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1996 |
| Grant date | Mar 25, 1997 |
| Priority date | — |
| Expiry date | Apr 5, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An idling rotational speed control system for an internal combustion engine installed in a vehicle including an air-fuel ratio sensor arranged in the exhaust system, and an ECU which corrects the air-fuel ratio of an air-fuel mixture supplied to the engine in a feedback manner responsive to an output from the air-fuel ratio sensor, by using an air-fuel ratio correction amount calculated according to the output from the air-fuel ratio sensor. The rotational speed of the engine is detected, and the ECU controls the rotational speed of the engine during idling to a desired value in a feedback manner responsive to the detected rotational speed of the engine. The ECU determines whether the idling rotational speed control system is abnormal, based on the detected rotational speed of the engine and a control parameter used for the control of the rotational speed of the engine during idling. The idling rotational speed control system includes at least one of a brake system operation sensor for detecting operation of the brake system, and a throttle valve opening sensor for detecting opening of the throttle valve. When at least one of conditions is satisfied that the brake system is operate…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.