Kenyon & Kenyon
Malfunction detection apparatus for detecting malfunction in evaporative fuel purge system
 A malfunction detection apparatus for detecting a malfunction in an evaporative fuel purge system, which malfunction detection apparatus is able to suppress a fluctuation of an air-fuel ratio. A negative pressure inside an intake passage is introduced into the evaporative fuel purge system. The existence/nonexistence of a malfunction in the evaporative fuel purge system is determined by using pressure values inside the evaporative fuel purge system which values are detected and supplied by a pressure detecting unit. The apparatus is provided with an air-fuel ratio fluctuation suppressing unit for suppressing a fluctuation of the air-fuel ratio of air suctioned into an engine when introducing the negative pressure into the evaporative fuel purge system. 
Toyota Jidosha Kabushiki Kaisha
F
F02M
inventional
Takayuki Toru Akinori Takaaki Yoshihiko
Otsuka Kidokoro Osanai Itoh Hyodo