Knock sensor diagnostic system and method
US7562558B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2007 |
| Grant date | Jul 21, 2009 |
| Priority date | — |
| Expiry date | Sep 11, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A knock sensor diagnostic system may include a knock sensor. A bias circuit applies a bias voltage to the knock sensor. An input circuit receives an input signal based on the bias voltage. A control module indicates a short circuit associated with the knock sensor based on the input signal. A knock sensor diagnostic system may also or alternatively include a signal generator that generates and applies a test signal with a predetermined frequency to the knock sensor. Another input circuit receives another input signal that is based on the test signal. A control module indicates an open circuit associated with the knock sensor based on the other input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.