Air filter restriction monitoring without pre-throttle pressure sensors
US7441449B2 · kind B2 · utility
9Cited by
4References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2007 |
| Grant date | Oct 28, 2008 |
| Priority date | — |
| Expiry date | May 2, 2027 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D35/0023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of monitoring air flow restriction in an air intake of an internal combustion engine includes recording a predetermined number of pre-throttle pressure samples, recording a predetermined number of mass air flow samples, which respectively correspond to the pre-throttle pressure samples and determining a slope based on the pre-throttle pressure samples and the mass air flow samples. Whether an air filter is inducing an air flow over restriction is determined based on the slope.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.