Engine control apparatus with cylinder discrimination function
US6341253B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 20, 2000 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Sep 20, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2457
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An engine control apparatus generates a 30° CA signal which rises per 30° CA rotation based on a rotational signal from a crank angle sensor and counts up a value CNT of a crank counter by the 30° CA signal. It also reads the level of a cylinder identification signal from a cam angle sensor every time when a reference position signal within the rotation signal is detected. It initializes the count value to 20 when the read level is low and to 8 when the read level is high. Although the apparatus carries out the cylinder discrimination based on the count value, it is also arranged so as not to initialize the count value when the previously read level is the same with the read level of this time. Thus, the cylinders can be identified correctly even if an abnormality occurs in a sensor for outputting a cylinder identification signal or in its wire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.