Air-fuel ratio control apparatus of internal combustion engine
US5411007A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | May 2, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air-fuel ratio control apparatus of an internal combustion engine in which a canister to adsorb and hold evaporated fuel is provided in a supply passage which communicates an intake passage of the internal combustion engine and a fuel tank, and an atmosphere opening/closing valve is provided so as to open the canister to the atmosphere. A purge valve is provided in the supply passage between the intake passage and the canister, and a pressure sensor communicates with the supply passage between the canister and the fuel tank. A control that closes the atmosphere opening/closing valve is closed when leakage is judged and reduces a pressure in the fuel tank to a predetermined negative pressure value, and thereafter closes the purge valve so that a leakage state of an evaporating system is discriminated. A fuel supply section is provided to supply the fuel to the internal combustion engine, and the control includes a control section for controlling in a manner such that when leakage judging conditions are satisfied, a preset promising correction amount is added to a fuel supply amount from the fuel supply section synchronously with the closing operation of the atmosphere opening/clo…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.