Apparatus for detecting revolutions of an internal combustion engine
US4274142A · kind A · utility
15Cited by
6References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 7, 1979 |
| Grant date | Jun 16, 1981 |
| Priority date | — |
| Expiry date | Aug 7, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/489
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a detecting apparatus for indicating engine revolutions or vehicle speed, a counter is provided to count up, for a predetermined period of time, the number of pulses produced by an angle sensor. To improve the accuracy of the measurement, the time width during which the pulses are counted can be varied in accordance with a rotational speed of the engine. In this way, a larger measurement time period is provided at lower speeds than at higher speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.