Air/fuel ratio control system equipped with a temperature sensor fail-safe system for an internal combustion engine
US4274381A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 2, 1979 |
| Grant date | Jun 23, 1981 |
| Priority date | — |
| Expiry date | May 2, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02D2041/227
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An air/fuel ratio control system equipped with a temperature sensor fail-safe system for an internal combustion engine, comprises an engine parameter detecting circuit for the estimation whether the engine coolant temperature sensor is normal or not, a constant voltage supply, and a switching circuit for transmitting the constant voltage to a control signal generator, in place of the output signal of the engine coolant temperature sensor, the control signal generator generating a control signal in accordance with various engine parameters including the engine temperature for the control of the air/fuel ratio of an air/fuel mixture supplied to the engine, thereby providing the control signal generator with a suitable signal when a failure occurs in the engine coolant temperature sensor to prevent undesirable operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.