Abstract: An evaporated fuel processing device may be provided with a canister configured to adsorb evaporated fuel evaporated in a fuel tank; a purge passage through which purge gas sent from the canister to the engine passes; a pump configured to send the purge gas from the canister to the intake passage; a control valve configured to switch between a communication state communicating the canister and the intake passage and a cutoff state cutting off the canister from the intake passage; a branch passage including one end connected to the purge passage on a downstream side relative to the pump and other end connected on an upstream side relative to the pump; and a concentration detector provided on the branch passage.

Abstract: A vehicle gas processing device is configured to supply gas generated by a vehicle to an intake pipe of a combustion engine. The device may includes: a gas pipe configured to communicate a gas generation source to the intake pipe, the gas pipe having a flexible end at least at an intake pipe side of the gas pipe; a check valve disposed between the intake pipe and the gas pipe, and configured to allow the gas to flow from the gas pipe toward the intake pipe and prohibit the gas to flow from the intake pipe toward the gas pipe; and a determining unit configured to determine that the gas pipe is detached from the check valve. The check valve is fixed to the intake pipe, and the gas pipe is detachably attached to the check valve.

Abstract: An evaporated fuel processing device that determines whether a normal state is established, by using pressures by a pressure detector while the evaporated fuel processing device shifts between: a first state where a purge passage is opened by a first valve, air passage is opened by a second valve, the purge passage is closed by a third valve, and a pump stops; a second state, after the first state, where the purge passage is opened by the first valve, the air passage is opened by the second valve, the purge passage is closed by the third valve, and the pump is operating; and a third state which takes place after the second state and where the purge passage is opened by the first valve, the air passage is closed by the second valve, the purge passage is closed by the third valve, and the pump stops.

Abstract: In an internal combustion engine system, a controller is configured to: perform a purge control during execution of an A/F feedback learning; detect a purge concentration after execution of the A/F feedback learning; calculate an A/F feedback learning correction value adjusted by offsetting an A/F feedback learning value with a contributing value of the purge concentration; disable updating of the A/F feedback learning correction value after calculation of the A/F feedback learning correction value and until the purge control is stopped; and detect the purge concentration based on an air-fuel ratio deviation amount.

Abstract: A detecting unit that detects a specific pressure difference between a pressure of gas that has passed throuch a canister and a pump and a pressure of the gas before passing through the canister and the pump. A gas flow rate from the pump may be higher with a smaller pressure difference between upstream and downstream sides relative to the pump, and higher with a higher purge gas densiy. A gas flow rate from the canister may be lower with a smaller pressure difference between upstream and downstream sides relative to the canister, and lower with a higher purge gas density. An estimating unit may estimate a flow rate of the purge gas while the specific pressure difference is an unchanged pressure difference being a pressure at which the flow rate of the gas is not chanced by the density of the purge gas.

Abstract: The evaporated fuel processing device may include a pump unit including a pump body configured to pump out evaporated fuel generated in a fuel tank to an intake passage, and a pump controller configured to drive the pump body; and a controller configured to cause the pump controller to control the pump body. When an index related to a temperature of the pump unit exceeds a predetermined range, the controller may restrict the driving of the pump body.

Abstract: An evaporated fuel processing device including a pump sending a purge gas from a canister to an intake passage, a control valve switching between a communication state and a cutoff state where the canister and the intake passage are cut off on the purge passage, a return flow passage having one end connected to the purge passage between the pump and the control valve, and other end connected to an upstream side of the pump, wherein the purge gas flows from the one end to the other end in a case where the pump is activated in the cutoff state of the control valve, and a detecting device specifying an evaporated fuel concentration in the return flow passage during the cutoff state of the control valve in a case where the control valve is controlled based on the duty ratio and the pump is activated.

Abstract: An engine system for a hybrid vehicle includes an intake passage, an injector, a vaporized-fuel treating apparatus, a vapor concentration sensor, an airflow meter, and an ECU. The vaporized-fuel treating apparatus is configured to collect vapor generated in a fuel tank into a canister, and purge the vaporized fuel into the intake passage through a purge passage provided with a purge valve and a purge pump. The ECU causes an injector to regulate an amount of fuel to be supplied to an engine during steady operation, and opens the purge valve. When an intake amount increases above an upper-limit intake amount, the ECU limits an upper limit of the detected intake amount to the upper-limit intake amount, calculates a request pump rotation number based on the upper-limit intake amount and a vapor concentration, and controls the purge pump based on the calculated request pump rotation number.

Abstract: An evaporated fuel processing device that includes a pump configured to supply purge gas, which includes evaporated fuel in a fuel tank, to an intake passage of an engine through a purge passage; a controller configured to control the pump; and a detecting unit configured to acquire a gas amount introduced to the intake passage while the pump is being driven in a stable state where an air amount introduced from open air to the intake passage is stable, and configured to detect, by using change in the acquired gas amount, a state where the purge gas is unable to be normally supplied from the purge passage to the intake passage.

Abstract: An evaporated fuel processing device including a purge passage through which a purge gas sent from a canister to an intake passage passes, a pump sending the purge gas to the intake passage, a control valve switching between a communication state and a cutoff state, a branch passage branching from the purge passage at an upstream end and joining the purge passage at a downstream end, a pressure specifying unit comprising a small diameter portion disposed on the branch passage, and specifying a pressure difference of the purge gas passing through the small diameter portion between an upstream side and a downstream side, and an estimation unit estimating a flow rate of the purge gas sent from the pump by using an evaporated fuel concentration in the purge gas that is estimated using an air-fuel ratio and the pressure difference.

Abstract: An evaporated fuel processing device may include: a canister configured to adsorb fuel evaporated in a fuel tank; a purge passage through which a purge gas sent from the canister to the intake passage passes; a control valve provided on the purge passage and having a variable aperture; and a differential pressure sensor configured to detect a pressure difference between an upstream side and a downstream side of the control valve.

Abstract: A vaporized-fuel treating apparatus is configured to perform purge control in which a purge valve is placed in an open state while a purge pump is being driven to introduce purge gas from a canister to an intake passage through a purge passage. When an actual value of a flow rate of the purge gas during execution of the purge control is defined as an actual purge flow rate, and an upper-limit value of the purge flow rate to prevent the occurrence of A/F disturbance where A/F in a combustion chamber of an engine excessively fluctuates, as an upper-limit purge flow rate, the number of rotations of the purge pump is controlled during execution of the purge control to adjust the actual purge flow rate to a value equal to or lower than the upper-limit purge flow rate.

Abstract: An evaporated fuel processing device may include: a canister; a purge passage through which purge gas sent from the canister to an intake passage passes; a pump; a control valve disposed on the purge passage and configured to switch between a communication state and a cutoff state; a specifying device configured to specify an evaporated fuel concentration of the purge gas in the purge passage when the purge gas is to be supplied from the canister to the intake passage. A controller may be configured to switch the control valve based on at least a first cycle and a second cycle which is longer than the first cycle. The specifying device may specify the evaporated fuel concentration of the purge gas in the purge passage while the pump is active and the control valve is in the cutoff state in the second cycle.

Abstract: A pump module includes a pump section that discharges evaporated fuel generated in a fuel tank to an intake path of an internal combustion engine.

Abstract: A pump module mounted in an evaporated fuel processing device may include: a pump pumping evaporated fuel in a purge passage to an intake passage; and a pump controller controlling drive of the pump. The pump controller may be communicably connected with a main controller configured to control an engine, and, configured to: perform, by using a characteristic of the pump, at least one process of a concentration detecting process and a normality determining process, the concentration detecting process being a process of detecting a concentration of the evaporated fuel in gas within the pump, and the normality determining process being a process of determining whether the pump is being driven normally or not; and send a process result of the at least one process to the main controller.

Abstract: A vaporized-fuel treating apparatus includes a canister, a vapor passage to direct vapor from a fuel tank to the canister, a purge passage to direct the vapor from the canister to an intake passage, a purge valve to open and close the purge passage, an atmospheric-air passage to draw atmospheric air into the canister, a purge pump provided in the atmospheric-air passage, and an ECU to control the purge valve, the purge pump, and others to purge the vapor from the canister. This apparatus includes a pressure limiting unit configured to limit the pressure downstream of the purge pump, the pressure acting on the fuel tank, from exceeding the withstanding pressure of the fuel tank while the ECU controls the purge valve and the purge pump to purge vapor from the canister to the intake passage.

Abstract: A pump module disclosed herein is mounted in an evaporated fuel processing device configured to perform a purge process in which evaporated fuel in a fuel tank is supplied to an intake passage of an engine through a purge passage. The pump module may include: a pump configured to pump the evaporated fuel in the purge passage to the intake passage; and a pump controller configured to control drive of the pump. The pump controller may be configured to: during the purge process, drive the pump at a rotational speed equal to or lower than a rotational speed threshold until when a predetermined period has elapsed from a start of the purge process; and after the predetermined period has elapsed, drive the pump at a rotational speed equal to or higher than the rotational speed threshold.

Abstract: An evaporated fuel processing device including a pump sending a purge gas from a canister to an intake passage, a control valve switching between a communication state and a cutoff state where the canister and the intake passage are cut off on the purge passage, a return flow passage having one end connected to the purge passage between the pump and the control valve, and other end connected to an upstream side of the pump, wherein the purge gas flows from the one end to the other end in a case where the pump is activated in the cutoff state of the control valve, and a detecting device specifying an evaporated fuel concentration in the return flow passage during the cutoff state of the control valve in a case where the control valve is controlled based on the duty ratio and the pump is activated.

Abstract: An evaporated fuel processing device may be provided with: a canister configured to adsorb fuel evaporated in a fuel tank; a purge passage connected between the canister and an intake passage of an engine; a pump provided on the purge passage; a concentration sensor configured to detect a concentration of purge gas; a branch passage connected to the purge passage; and a switching device configured to switch between a state in which the purge gas passes through the purge passage between both ends of the branch passage and a state in which the purge gas does not pass through the purge passage between the both ends of the branch passage. The concentration sensor is provided on the branch passage.

Abstract: An evaporated fuel processing apparatus is provided with a canister to collect vapor, a purge passage to purge the vapor collected in the canister to an intake passage, a purge valve provided in the purge passage to regulate a purge flow rate of the vapor, a purge pump provided between the canister and the purge valve to pressure-feed the vapor from the canister to the purge passage, and a vapor pressure sensor to detect vapor pressure in the purge passage. An inside of the canister is communicated with the atmosphere, a capacity chamber (the canister) is provided upstream of the purge pump, and the vapor pressure sensor is provided in the purge passage between the purge valve and the purge pump.