Device for controlling the ignition timing for internal combustion engines
US6889655B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 24, 2004 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Sep 24, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for controlling the ignition timing for internal combustion engines correctly detecting fault of a knocking sensor over the whole rotational range of the engine. The device for controlling the ignition timing takes out knocking signals and produces an ignition timing control signal relying upon the knocking signals, and comprises a knocking sensor 1, a microcomputer 2 for producing a fault detection execution signal for executing the detection of fault of the knocking sensor and for applying a pulse voltage to the knocking sensor 1 relying upon the fault detection execution signal, comparison means 5 and 6 for comparing the charging voltage or discharging voltage of the knocking sensor 1 with two different threshold values, and logic means (NOR circuit) 7 for obtaining an OR of the outputs of the comparison means 5 and 6. The microcomputer 2 finds the sum of pulse widths output by the logic means during the period of detecting the fault and judges the fault of the knocking sensor relying upon the sum that is found of the pulse widths.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.