Abstract: An evaporated fuel processing device that includes a fuel tank; a vapor passage through which evaporated fuel generated from a fuel in the fuel tank flows; a closing valve configured to open and close the vapor passage; a concentration sensor configured to detect a concentration of the evaporated fuel in the vapor passage downstream of the closing valve; and a controller. When the closing valve moves toward an open side in the closed state, the controller may specify a valve-opening-start position of the closing valve based on a concentration detected by the concentration sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.

Abstract: A refueling control system for an internal combustion engine includes a fuel tank; a vapor pipe; a step motor-driven shut-off valve; a fuel filler lid; and an electronic control unit configured to, when the fuel filler lid is to be opened, i) drive the shut-off valve such that the shut-off valve is opened, ii) close the fuel filler lid when an opening degree of the shut-off valve is less than a set opening degree, and iii) open the fuel filler lid when the opening degree of the shut-off valve is greater than or equal to the set opening degree. The electronic control unit sets the set opening degree such that the set opening degree when an opening speed of the shut-off valve is low is greater than the set opening degree when the opening speed of the shut-off valve is high.

Abstract: An evaporated fuel processing device that includes a pressurizing pump configured to pressurize gas in the vapor passage downstream of the closing valve toward the closing valve; a first pressure sensor configured to detect a pressure in the fuel tank directly or indirectly, and/or a second pressure sensor configured to detect a pressure in the vapor passage downstream of the closing valve directly or indirectly. When the closing valve moves toward an open side in the closed state with the pressurizing pump pressurizing the gas in the vapor passage downstream of the closing valve toward the closing valve, the controller may specify a valve-opening-start position based on the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.

Abstract: When a closing valve is in a closed state, a controller may determine presence of leakage from the closing valve based on: a pressure detected by a first pressure sensor and/or a pressure detected by a second pressure sensor detected when a difference between a pressure in the vapor passage upstream of the closing valve and a pressure in the vapor passage downstream of the closing valve is a first difference; and the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor detected when the difference is a second difference different from the first difference.

Abstract: An evaporated fuel processing device that includes a pressurizing pump configured to pressurize gas in the vapor passage downstream of the closing valve toward the closing valve; a first pressure sensor configured to detect a pressure in the fuel tank directly or indirectly, and/or a second pressure sensor configured to detect a pressure in the vapor passage downstream of the closing valve directly or indirectly. When the closing valve moves toward an open side in the closed state with the pressurizing pump pressurizing the gas in the vapor passage downstream of the closing valve toward the closing valve, the controller may specify a valve-opening-start position based on the pressure detected by the first pressure sensor and/or the pressure detected by the second pressure sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.

Abstract: An evaporated fuel processing device that includes a fuel tank; a vapor passage through which evaporated fuel generated from a fuel in the fuel tank flows; a closing valve configured to open and close the vapor passage; a concentration sensor configured to detect a concentration of the evaporated fuel in the vapor passage downstream of the closing valve; and a controller. When the closing valve moves toward an open side in the closed state, the controller may specify a valve-opening-start position of the closing valve based on a concentration detected by the concentration sensor, wherein the valve-opening-start position is a position where the closing valve transitions from the closed state to the opened state.

Abstract: In an evaporated fuel treatment apparatus including a bypass passage branching from an atmosphere passage and connected to a canister by detouring around at least one ii and a bypass valve to open and close the bypass passage, a controller holds the bypass valve in a closed state until an integrated purge flow rate reaches a predetermined value after start of purge control, the integrated purge flow rate being an integrated value of flow rate of purge gas flowing through a purge passage. When the integrated purge flow rate reaches the predetermined value, the controller turns the bypass valve to an open state.

Abstract: The evaporated fuel treatment device includes: a canister that adsorbs evaporated fuel generated within a fuel tank that is provided to a vehicle; a vapor passage that connects the canister and the fuel tank; a shutoff valve capable of closing off and opening up the vapor passage. When a specific event by which a current position of the shutoff valve becomes unknown occurs and initialization processing has become necessary, a first process is performed in which the shutoff valve is operated by a first operating amount that is set as an operating amount capable of operating the shutoff valve to an operation limit, irrespective of the current position, while, when the initialization processing has become necessary without the specific event occurring, a second process is performed in which the shutoff valve is operated by a second operating amount that is an operating amount from the current position to an initial position, and that is smaller than the first operating amount.

Abstract: An evaporative fuel treating apparatus includes: a canister; a vapor passage configured to cause a fuel tank to communicate with the canister; a closure valve including a valve disc arranged in the vapor passage and a stepping motor configured to open and close the valve disc; and a control device configured to control the closure valve. The control device is configured, in opening the valve disc to perform a pressure relief operation of the fuel tank, to: execute a flow rate estimation processing that calculates an estimated flow rate of gas passing through the closure valve, based on the absolute value of the amount of change of in-tank pressure of the fuel tank and a space volume inside the fuel tank; and execute a motor control processing that controls the number of steps of the stepping motor such that the estimated flow rate approaches a required flow rate.

Abstract: An evaporated fuel treatment apparatus includes a partition wall for dividing the inside of a canister into a first region located close to a purge passage and a fuel tank and a second region located close to an atmosphere passage, an electromagnetic valve provided in the partition wall and configured to open and close between the first and second regions, a small hole provided in the partition wall to release the pressure between the first and second regions, and a determination unit for performing a leak determination of the apparatus and a failure determination of a purge valve and the electromagnetic valve based on behaviors of the internal pressure of the canister according to opening and closing operations of the electromagnetic valve.

Abstract: In an evaporated fuel treatment apparatus including a bypass passage branching from an atmosphere passage and connected to a canister by detouring around at least one ii and a bypass valve to open and close the bypass passage, a controller holds the bypass valve in a closed state until an integrated purge flow rate reaches a predetermined value after start of purge control, the integrated purge flow rate being an integrated value of flow rate of purge gas flowing through a purge passage. When the integrated purge flow rate reaches the predetermined value, the controller turns the bypass valve to an open state.

Abstract: A vaporized fuel treatment device includes a sealing valve disposed in a vapor passage between a fuel tank and a canister. An ECU is programmed to decrease an internal pressure of the fuel tank by a pump via the canister so as to diagnose whether leakage occurs in the vapor passage in a state where the communication between the canister and the atmosphere is cut off and the sealing valve is opened. The ECU is programmed to execute a learning of a valve opening start position of the sealing valve based on a change in the internal pressure of the fuel tank when changing an axial distance between valve element and a valve seat when the internal pressure of the fuel tank is equal to or smaller than a predetermined value after a diagnosis of leakage in the vapor passage.

Abstract: Both an improvement in detection accuracy of a valve opening position of a blocking valve and a reduction in time required for learning of the valve opening position are achieved. An evaporated fuel processing apparatus is provided with a learning device configured to learn the valve opening position of the blocking valve. The learning device learns the valve opening position (i) by stepwisely increasing a stroke amount by rotating a stepping motor by two steps at each time in a valve opening direction and (ii) by determining whether a difference between the stroke amount at present and the stroke amount corresponding to the valve opening position is one step of rotation of the stepping motor, or two steps, on the basis of pressure fluctuation on the canister side of the blocking valve associated with the rotation of the stepping motor when the blocking valve is opened, when learning the valve opening position.

Abstract: A refueling control system for an internal combustion engine includes a fuel tank; a vapor pipe; a step motor-driven shut-off valve; a fuel filler lid; and an electronic control unit configured to, when the fuel filler lid is to be opened, i) drive the shut-off valve such that the shut-off valve is opened, ii) close the fuel filler lid when an opening degree of the shut-off valve is less than a set opening degree, and iii) open the fuel filler lid when the opening degree of the shut-off valve is greater than or equal to the set opening degree. The electronic control unit sets the set opening degree such that the set opening degree when an opening speed of the shut-off valve is low is greater than the set opening degree when the opening speed of the shut-off valve is high.

Abstract: A vaporized fuel treatment device includes a sealing valve disposed in a vapor passage between a fuel tank and a canister and is configured to include a valve element moves forward and backward in an axial direction to a valve seat, a cut-off valve configured to cut off a communication between the canister and an atmosphere, a tank internal pressure sensor detects an internal pressure of the fuel tank, and a canister internal pressure sensor that detects an internal pressure of the canister, a controller programmed to change an axial distance between the valve element and the valve seat in a state where the cut-off valve cuts off the communication between the canister and the atmosphere and to learn a valve opening start position of the sealing valve based on changes in the internal pressures of the fuel tank and the canister depending on a change in the axial distance.

Abstract: An evaporated fuel treating device includes: a canister configured to adsorb evaporated fuel generated in a fuel tank through a vapor passage; a blocking valve configured to close and open the vapor passage, the blocking valve having a stepping motor as a drive source; and a controller configured to operate the blocking valve by controlling electric power that is supplied from a predetermined power supply to the blocking valve. The controller is configured, when there is a request to drive the blocking valve, to operate the blocking valve by controlling the electric power such that when a voltage that is supplied from the power supply to the blocking valve is less than a predetermined value, a driving period which is an interval between pulses that are supplied to the stepping motor becomes long compared to when the voltage is equal to or higher than the predetermined value.

Abstract: An evaporated fuel treatment device executes a pressure reducing control while monitoring inner pressure of a fuel tank, so that when the inner pressure of the fuel tank exceeds a predetermined value prior to fueling to the fuel tank, pressure reduction progresses within a range that the flow rate of a vapor passage does not exceed the boundary flow rate where the vapor passage is closed by a valve element of an ORVR valve, and also a valve opening speed of the closing valve is made higher as the inner pressure of the fuel tank becomes lower.

Abstract: In a vaporized fuel processing apparatus in which fuel vapor within a fuel tank is adsorbed by a canister, the adsorbed vaporized fuel is drawn to an engine, a closing valve is provided connecting the fuel tank and the canister for controlling communication between the fuel tank and the canister, and a purge valve is provided connecting the canister and the engine for controlling communication between the canister and the engine. The vaporized fuel processing apparatus includes an internal pressure sensor configured to detect a pressure of a space within the fuel tank as an internal pressure, and a closing valve control means configured to open the closing valve for supplying an atmospheric pressure to the fuel tank via the canister when the sensor detects that the internal pressure of the fuel tank is negative, while the purge valve is closed. Therefore, the air/fuel ratio is prevented from being disturbed.

Abstract: Both an improvement in detection accuracy of a valve opening position of a blocking valve and a reduction in time required for learning of the valve opening position are achieved. An evaporated fuel processing apparatus is provided with a learning device configured to learn the valve opening position of the blocking valve. The learning device learns the valve opening position (i) by stepwisely increasing a stroke amount by rotating a stepping motor by two steps at each time in a valve opening direction and (ii) by determining whether a difference between the stroke amount at present and the stroke amount corresponding to the valve opening position is one step of rotation of the stepping motor, or two steps, on the basis of pressure fluctuation on the canister side of the blocking valve associated with the rotation of the stepping motor when the blocking valve is opened, when learning the valve opening position.

Abstract: An evaporated fuel processing apparatus is provided with an initializer configured to increase a step number with which a stepping motor is rotated in a valve closing direction, when there is an initialization request for the blocking valve and tank pressure of the fuel tank is in a predetermined pressure range near atmospheric pressure, in comparison with when the tank pressure is out of the predetermined pressure range.