Control apparatus for an internal combustion engine
US6988483B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 18, 2004 |
| Grant date | Jan 24, 2006 |
| Priority date | — |
| Expiry date | Oct 18, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L27/007
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
To provide a control apparatus for an internal combustion engine which can judge an abnormality regardless of one line type or two line type, and can also detect the classification of abnormality. The control apparatus includes: a knock sensor having a piezoelectric element for detecting vibrations that are generated in the internal combustion engine, and a resistor that is connected in parallel with the piezoelectric element; and an interface circuit that detects a knock in accordance with an output from the knock sensor and detects an abnormality of the knock sensor, and the interface circuit includes a bias unit that conducts biasing by pulling up and pulling down an output from the knock sensor, and detects the abnormality of the knock sensor with a direct current component of the bias unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.