Evaporative fuel processing apparatus of internal combustion engine
US5778859A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 14, 1997 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | May 14, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An upper limit value of a target purge rate is set as a maximum purge rate PGRMAX, taking stability of air-fuel ratio control into consideration. On this occasion, in addition to time upper-limit purge rate PGTGT, full-opening purge rate PG 100, and limit purge rate PGLMT as maximum purge rates based on an amount of vapor desorbing from the canister, tank vapor purge rate PGTANK is obtained as a maximum purge rate based on an amount of vapor introduced directly from the fuel tank (steps 701 to 704). Then a minimum value is set as the maximum purge rate PGRMAX out of these upper limit values of the respective purge rates (step 705).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.