Failure-detecting device and fail-safe device for tank internal pressure sensor of internal combustion engines
US5269277A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1993 |
| Grant date | Dec 14, 1993 |
| Priority date | — |
| Expiry date | Jan 19, 2013 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02M25/0809
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A failure-detecting device detects failure of a tank internal pressure sensor for an internal combustion engine. The tank internal pressure sensor is provided in a fuel tank for detecting pressure within the fuel tank. The failure of the tank internal pressure sensor is detected by detecting an amount of variation in an output from the tank internal pressure sensor occurring within a predetermined time period elapses after the start of the engine and determining that the tank internal pressure sensor is abnormal when the amount of variation is below a predetermined value upon the lapse of the predetermined time period. A fail-safe device inhibits abnormality diagnosis of the evaporative emission control system when it is determined that the tank internal pressure sensor is abnormal. A fail-safe device performs a fail-safe action including at least opening a control valve arranged at an air inlet port of a canister for closing and opening the air inlet port, when it is determined that the tank internal pressure sensor is abnormal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.