Crank signal error detection using a cam signal interval
US8978453B2 · kind B2 · utility
6Cited by
2References
6Claims
0Family size
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Key dates
| Filing date | Apr 12, 2012 |
| Grant date | Mar 17, 2015 |
| Priority date | — |
| Expiry date | Sep 24, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01M15/06
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method of detecting a crank signal error that includes incrementing a crank tooth counter in response to detecting a crank signal, comparing the crank tooth counter to an expected value when a cam signal is detected, and indicating a crank signal error if the crank tooth counter is not substantially equal to the expected value. This method is advantageous because a cam interval used to determine when to start and stop counting crank tooth pulses is automatically adjusted for variations in engine speed, while the prior art time based methods must adjust the time interval for variations in engine speed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.