Kenyon & Kenyon
Apparatus for detecting a malfunction in an evaporated fuel purge system
 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. 
Toyota Jidosha Kabushiki Kaisha
F
F02M
inventional
Takayuki
Otsuka