Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1994-02-22
1995-08-22
Miller, Carl S.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
123198D, F02M 3302
Patent
active
054430518
ABSTRACT:
A malfunction detecting apparatus of an evaporated fuel purge system includes: a negative pressure control part for switching on a purge control valve to open a purge line between a canister and an intake passage of an engine during a process time, and for switching off the purge control valve at the end of the process time, so that the purge line and a vapor line are subjected to a negative pressure of the intake passage; a pressure detecting part arranged in a line connected to the purge line and to the vapor line for measuring a purge line pressure within the system and for outputting the measured pressure; and a discriminating part for detecting whether or not a malfunction in the system has occurred, based on the measured pressure supplied from the pressure detecting part, for calculating a continuous time during which the measured pressure is continuously lower than a reference pressure value within the process time, and for detecting whether or not the continuous time exceeds a reference time value within the process time.
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Miller Carl S.
Toyota Jidosha & Kabushiki Kaisha
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