Abstract: A vaporized fuel treating device having a canister that is configured to adsorb vaporized fuel in a fuel tank and to feed the adsorbed vaporized fuel to an engine may include a pressure sensor that is configured to periodically detect an inner pressure of the fuel tank, and a pressure sensor failure determination device that is configured to determine that the pressure sensor has failed when a change of the inner pressure detected by the pressure sensor in a unit of time is not less than a predetermined pressure value that is greater than a maximum value of possible pressure changes within the fuel tank.

Abstract: A fuel vapor processing apparatus includes a canister housing an adsorbent material that adsorbs fuel vapor from a tank, and a valve in a passage connecting the canister and tank. When a stroke amount is within a range, the valve is closed to close the tank and a valve opening start position is learned. In the learning, the stroke amount is varied in the opening direction by repeatedly changing in the opening direction by a first stroke and maintaining for a first time period, and subsequently changing in a closing direction by a second stroke and maintaining for a second time period. The valve opening start position is determined based on the stroke amount in the second time period when the tank pressure is reduced by the predetermined value or more or in a preceding process.

Abstract: An evaporated fuel processing device includes a flow control valve that is used as a valve to be installed in a pathway connecting a canister and a fuel tank. The device includes an inner pressure sensor configured to detect a pressure in an interior space of the fuel tank as an inner pressure, a valve-opening start position determination means configured to calculate a second order differential value of the inner pressure after a valve opening operation of the flow control valve is started and to determine a valve opening position of the flow control valve as a valve-opening start position when the second order differential value is equal to or greater than a first predetermined value, and a learning means configured to store the valve-opening start position as a learned value that is used when a valve-opening control of the flow control valve is performed.

Abstract: A vaporized fuel processing apparatus in which, if an internal pressure of a fuel tank is high when refueling, a closing valve opens before a refueling cap opens, so that vaporized fuel is flown to a canister via a path with a float valve to lower the internal pressure of the tank. The apparatus includes a refueling switch for instructing a start of refueling to the fuel tank, an internal pressure sensor for detecting a space pressure inside the tank, and a closing valve control means for, if the refueling start signal is output from the refueling switch and the internal pressure of the fuel tank is higher than a set pressure, opening the closing valve within a range in which the float valve does not operate, and increasing the valve-opening speed of the closing valve in accordance with a reduction in the internal pressure of the fuel tank.

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: An evaporated fuel processing device utilizing a flow rate control valve as a valve positioned in a passage connecting a fuel tank with a canister. The device includes: a valve opening means for opening the flow rate control valve at a constant speed; an internal pressure sensor; a valve opening start position detecting means for acquiring a second derivative value of the internal pressure after a valve opening motion of the flow rate control valve has started and for detecting a valve opening start position of the flow rate control valve based on the second derivative value; a learning means for storing the valve opening start position; and a valve opening speed change means for changing a valve opening speed of the valve opening means based on a variation speed of the internal pressure before the valve opening motion of the flow rate control valve has started.

Abstract: An evaporated fuel processing device configured to adsorb evaporated fuel in a fuel tank to a canister and to feed the adsorbed evaporated fuel to an engine. The device includes an inner pressure sensor configured to detect a pressure in an interior space of the fuel tank, a valve-opening start position determination means configured to change the stroke amount of a flow control valve from an initial condition and to determine a valve-opening start position of the flow control valve based on a requirement that a range of variation of the inner pressure is equal to or greater than a predetermined value, a learning means configured to store the valve-opening start position, and a prohibition means configured to prohibit the valve-opening start position determination means from determining the valve-opening start position when the inner pressure falls within a predetermined pressure range relative to the atmospheric pressure.

Abstract: A vaporized fuel processing apparatus has a canister capable of adsorbing vaporized fuel generated in a fuel tank, a vapor path connecting the canister to the fuel tank, a closing valve provided in the vapor path, a purge path connecting the canister to an intake path of an engine, a pressure sensor for detecting the inner pressure of the fuel tank, and an electric control unit controlling the vaporized fuel processing apparatus. When the inner pressure of the fuel tank is in excess of the measurement range of the pressure sensor, the learning of the valve opening start position is prohibited, and pre-learning depressurization control is performed through change of the stroke amount of the closing valve in the valve opening direction until the inner pressure of the fuel tank is within the measurement range of the pressure sensor.

Abstract: A vaporized fuel processing apparatus has a closing valve provided in a vapor path connecting an adsorbent canister to the fuel tank, a pressure sensor configured to detect the inner pressure of the fuel tank, and an electric control unit configured to determine whether the amount of increase in the inner pressure of the fuel tank is within an acceptable range or not, to learn a valve opening start position of the closing valve when the inner pressure of the fuel tank is reduced by an amount not less than a predetermined value, and to stop or prohibit the learning of the valve opening start position of the closing valve when the amount of increase in the inner pressure of the fuel tank is not within the acceptable range during or before the learning of the valve opening start position of the closing valve.

Abstract: A fuel vapor processing apparatus includes an adsorbent canister, a vapor path connecting the adsorbent canister to a fuel tank, and a flow control valve disposed in the vapor path. The flow control valve is kept closed while a movement distance of a valve body from a predetermined initial position toward a valve opening direction is less than a predetermined distance. A control unit comprising part of the apparatus is configured to set a valve opening speed of the flow control valve to a first speed under a condition where the movement distance of the valve body is less than the predetermined distance, and to set the valve opening speed of the flow control valve to a second speed lower than the first speed under a condition where the movement distance of the valve body is greater than the predetermined distance.

Abstract: An evaporated fuel treatment device includes a canister, an evaporated fuel outflow detecting means, a pressure sensor, a pressure change detecting means, and a pressure sensor failure determining means. The canister adsorbs evaporated fuel from a fuel tank, and purges the adsorbed fuel to an engine. The evaporated fuel outflow detecting means undergoes a change in a signal as the evaporated fuel flows out of the fuel tank. The pressure sensor detects an inner pressure of the fuel tank. The pressure change detecting means detects whether or not the pressure is in a static state. When the evaporated fuel outflow detecting means detects that evaporated fuel has flowed out of the fuel tank and when the pressure change detecting means detects that the pressure is in a static state, the pressure sensor failure determining means determines that the pressure sensor is out of order.

Abstract: A fuel vapor processing apparatus includes a vapor path connecting an adsorbent canister to a tank, where a valve is disposed in the vapor path and comprises a body and a seat, and a control unit configured to detect a movement distance of the body from the seat as a valve movement distance at a valve opening start position. This position results when a change in inner pressure of the tank after starting movement of the body toward a valve opening direction becomes greater in magnitude than a predetermined amount, wherein the control unit stores the valve movement distance in the valve opening direction as a learning value, and also stores one of two predetermined restriction values as the learning value instead of the valve movement distance when the valve movement distance is not within a range between a previously stored learning value and one of the restriction values.

Abstract: A vaporized fuel processing apparatus has a fuel tank, a canister configured to adsorb vaporized fuel, a vapor path connecting the canister to the fuel tank, a closing valve provided in the vapor path, a pressure sensor measuring inner pressure of the fuel tank, and an electric control unit connected with the closing valve and the pressure sensor. The electric control unit is configured to close or open the closing valve in order to initialize the closing valve or open the closing valve in order to release the vaporized fuel from the fuel tank. Further, the electric control unit is configured to detect failure of the closing valve depending on change in the inner pressure of the fuel tank within a predetermined time from when the closing valve is opened or is closed for initialization of the closing valve or release of the vaporized fuel from the fuel tank.

Abstract: A vaporized fuel processing apparatus has a closing valve provided in a vapor path connecting an adsorbent canister to the fuel tank, a pressure sensor configured to detect the inner pressure of the fuel tank, and an electric control unit configured to determine whether the amount of increase in the inner pressure of the fuel tank is within an acceptable range or not, to learn a valve opening start position of the closing valve when the inner pressure of the fuel tank is reduced by an amount not less than a predetermined value, and to stop or prohibit the learning of the valve opening start position of the closing valve when the amount of increase in the inner pressure of the fuel tank is not within the acceptable range during or before the learning of the valve opening start position of the closing valve.

Abstract: A vaporized fuel processing apparatus has a canister capable of adsorbing vaporized fuel generated in a fuel tank, a closing valve provided in the vapor path connecting the canister and the fuel tank and having a valve seat and a valve movable portion, a pressure sensor configured to detect inner pressure of the fuel tank, and an electric control unit. The electric control unit is configured to set a learning value that is an axial distance between the valve seat and the valve movable portion at a valve opening start position at a fail-safe value such that the closing valve is in the valve closing state when the inner pressure of the fuel tank decreases by less than a predetermined value after repeating a stroke control process more than predetermined times.

Abstract: A fuel vapor processing apparatus includes a canister housing an adsorbent material that adsorbs fuel vapor from a tank, and a valve in a passage connecting the canister and tank. When a stroke amount is within a range, the valve is closed to close the tank and a valve opening start position is learned. In the learning, the stroke amount is varied in the opening direction by repeatedly changing in the opening direction by a first stroke and maintaining for a first time period, and subsequently changing in a closing direction by a second stroke and maintaining for a second time period. The valve opening start position is determined based on the stroke amount in the second time period when the tank pressure is reduced by the predetermined value or more or in a preceding process.

Abstract: A vaporized fuel processing apparatus has a canister loaded with an adsorbent capable of adsorbing vaporized fuel generated in a fuel tank, a closing valve provided a vapor path connecting the canister and the fuel tank and having a valve seat and a valve movable portion such that a distance between the valve seat and the valve movable portion is stroke amount, a pressure sensor configured to detect inner pressure of the fuel tank, and an electric control unit. The electric control unit is configured to perform abnormal state depressurization control of the fuel tank, in a state that the pressure sensor cannot detect the inner pressure of the fuel tank, by setting the stroke amount of the closing valve at a fail-safe value in which the closing valve is closed, and then changing the stroke amount in a valve opening direction of the closing valve from the fail-safe value.

Abstract: An evaporated fuel processing device has a canister, a vapor passage, a purge passage, a shutoff valve, a storage device and a control device. The canister includes an adsorbent material that adsorbs evaporated fuel generated in a fuel tank. The vapor passage connects the canister and the fuel tank. The purge passage connects the canister and an intake passage of an engine. The shutoff valve is provided in the vapor passage, and adjusts flow rate of gas flowing through the vapor passage. The storage device stores in advance a reference value for the shutoff valve corresponding to internal pressure of the fuel tank. The shutoff valve is controlled based on the reference value, which is obtained from the internal pressure of the fuel tank, and pressure release control is performed on the fuel tank.

Abstract: A fuel vapor processing apparatus may include a canister, a closing valve provided in a vapor passage connecting the canister and the fuel tank, an actuator coupled to the movable valve member, and a control device coupled to the actuator. The control device may perform a learning control, in which a valve opening start position is learned based on a stroke distance of the movable valve member, which is given at the time when an internal pressure of the fuel tank is reduced by a predetermined pressure value while the moving distance of the movable valve member is changed such that (a) the movable valve member moves from the reference position to a learning start position at a first speed in a valve opening direction and (b) the movable valve member moves further from the learning start position at a second speed in the valve opening direction.

Abstract: A fuel vapor processing apparatus may include a canister, a purge passage connecting the canister and an engine, a vapor passage connecting the canister and a fuel tank, a closing valve disposed in the vapor passage, a pressure detection device for detecting a pressure within the fuel tank, and a controller coupled to the closing valve and the pressure detection device. The controller may output a control signal to the closing valve for opening the closing valve or for closing the closing valve. The controller may include an abnormality determination device that may determine whether or not the pressure detection device is operating properly based a detection value of the pressure detection device detected at a time when the engine is inactive and after the controller outputs the control signal to the closing valve for opening the closing valve or for closing the closing valve.