On-line self-calibration of mass airflow sensors in reciprocating engines
US6370935B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 16, 1998 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Oct 16, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In an internal combustion engine having an exhaust gas recirculation system, a mass airflow (MAF) sensor is disposed at the air inlet to an engine cylinder. For engines with an EGR recirculation path, the sensor is upstream of that path. The MAF sensor provides signals to an engine control module (ECM) indicative of the mass airflow of the intake charge to the engine. A system and method for on-line self-recalibration of the MAF sensor and the MAF values includes comparing the sensed MAF value with an ideal MAF value obtained using data from sensors downstream from the MAF sensor. If a comparison of the sensed versus the actual MAF values reveals that the MAF sensor is out of calibration, a regression analysis is applied to several data pairs of MAF sensor output magnitude and ideal MAF value to modify the relationship between MAF sensor output and sensed MAF value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.