Abstract: A pump flow passage 52 which extends in a flow direction F1 and through which fluids introduced through first and second inlet pipe 62, 79 flow is disposed inside a main body 51 of a purge pump 5 of an evaporative fuel processing device, a venturi 53 which decreases in diameter toward downstream is formed in the pump flow passage 52 at a position downstream of the first inlet pipe 62 in the flow direction F1, the main body 51 has an upstream-side member 6 in which the first inlet pipe 62 is disposed, and a downstream-side member 8 in which a discharge pipe 81 is disposed, and connection faces 74, 87 of the upstream-side member 6 and the downstream-side member 8 are disposed upstream of the smallest diameter part 55, at which the inner diameter of the venturi 53 is the smallest, in the flow direction F1.

Abstract: A pump flow passage 52 which extends in a flow direction F1 and through which fluids introduced through first and second inlet pipe 62, 79 flow is disposed inside a main body 51 of a purge pump 5 of an evaporative fuel processing device, a venturi 53 which decreases in diameter toward downstream is formed in the pump flow passage 52 at a position downstream of the first inlet pipe 62 in the flow direction F1, the main body 51 has an upstream-side member 6 in which the first inlet pipe 62 is disposed, and a downstream-side member 8 in which a discharge pipe 81 is disposed, and connection faces 74, 87 of the upstream-side member 6 and the downstream-side member 8 are disposed upstream of the smallest diameter part 55, at which the inner diameter of the venturi 53 is the smallest, in the flow direction F1.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.