Failure-detecting device and fail-safe device for tank internal

Details Failure-detecting device and fail-safe device for tank internal Failure-detecting device and fail-safe device for tank internal

1993-01-19

1993-12-14

Cross, E. Rollins

Internal-combustion engines

Charge forming device

Having fuel vapor recovery and storage system

123198D, F02M 3302, F02B 7700

Patent

active

052692779

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.

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patent: 5197442 (1993-03-01), Blumenstock et al.
patent: 5205263 (1993-04-01), Blumenstock et al.

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