Air-fuel ratio controller for internal combustion engine and diagnosis apparatus for intake sensors
US7631550B2 · kind B2 · utility
3Cited by
7References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 21, 2007 |
| Grant date | Dec 15, 2009 |
| Priority date | — |
| Expiry date | Oct 15, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2200/0406
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A computer calculates an estimated cylinder-intake-air amount based on outputs from an airflow meter and a throttle position sensor, and then calculates a reference cylinder-intake-air amount based on an air-fuel ratio in an exhaust gas and fuel injection amount. An error of the estimated cylinder-intake-air amount is calculated by comparing the reference cylinder-intake-air amount with an estimated cylinder-intake-air amount base value. The error is low-pass filtered. The estimated cylinder-intake-air amount base value is corrected to obtain the final estimated cylinder-intake-air amount.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.