Honda Motor Co., Ltd.

Junji Saiga

Masakazu Kitamoto

Ayumu Horiba

Koichi Hidano

Kiyofumi Shida

Yoshikazu Kaneyasu

Hiroshi Kawanishi

Yasunobu Endo

A pump flow passagewhich extends in a flow direction Fand through which fluids introduced through first and second inlet pipeflow is disposed inside a main bodyof a purge pumpof an evaporative fuel processing device, a venturiwhich decreases in diameter toward downstream is formed in the pump flow passageat a position downstream of the first inlet pipein the flow direction F, the main bodyhas an upstream-side memberin which the first inlet pipeis disposed, and a downstream-side memberin which a discharge pipeis disposed, and connection facesof the upstream-side memberand the downstream-side memberare disposed upstream of the smallest diameter part, at which the inner diameter of the venturiis the smallest, in the flow direction F

Evaporative fuel processing device and fluid processing device

An evaporated fuel treatment apparatus includes a control valve having a dead zone range in which an evaporated fuel is blocked even if the opening angle is increased from a close position in opening direction and a communicating range in which the evaporated fuel is allowed to flow therethrough when opening angle is increased from the dead zone range. A control unit determines whether the opening angle is switched between the dead zone range and the communicating range. The switching is determined on the basis of a pressure inside the fuel tank detected with a pressure sensor and an air-fuel ratio detected by an air-fuel ratio sensor. A control valve installed in a communication path between a fuel tank and a canister is prevented from being seized.

Evaporated fuel treatment apparatus

An evaporated fuel treatment apparatus including a canister for adsorbing an evaporated fuel in a fuel tank, a control valve at a vapor path communicating with a fuel tank and a canister, has a dead-zone range where a flow of the evaporated fuel is blocked even if an opening angle of the control valve is increased in an open direction from zero opening angle, and allows the evaporated fuel to flow through over the dead-zone range. The control unit increases the opening angle from substantially zero to a predetermined angle in the dead-zone range and stands by prior to the opening control, and increases the opening angle from the predetermined angle upon the opening control. An output value by control unit set in the dead-zone range is compared with a detected value to detect a failure of the control valve.

Evaporated fuel treatment apparatus and method of detecting failure in control valve

An end structure for a pipe is provided, through which air is drawn from a lower position to an upper position relative to a vertical direction of a vehicle. An area of an opening at an end of the pipe is adapted to be greater than a cross section area of the pipe.

Growing community of inventors

Saitama, Japan

Junji Saiga