Abstract: A leak diagnosis device for a fuel vapor treatment apparatus, comprising: a first diagnosis unit that performs a leak diagnosis of a fuel tank based on a tank internal pressure in a closed state of a sealing valve; a determination unit that opens a sealing valve in a state where a purge valve and a switching valve are closed when the tank internal pressure is within a normal range, and determines whether there is an influence on the valve openability of the switching valve; and a second diagnosis unit that performs a leak diagnosis of the canister based on the tank internal pressure or the canister internal pressure when the determination unit makes a negative determination, and performs a leak diagnosis of the canister based on the canister internal pressure after closing the closed valve when the determination unit makes an affirmative determination.

Abstract: Provided is a device information management system capable of preventing unnecessary information disclosure to competitors.

Abstract: The fuel vapor treatment apparatus includes a fuel tank, a canister, a vapor passage, a purge passage, a sealing valve, a purge valve, an outside air introduction passage, a switching valve, and a differential pressure detector. A processing device of the fuel vapor treatment apparatus includes a purge control unit and a purge diagnosis unit. The purge control unit performs a purge process by opening the purge valve in a state where the purge valve and the sealing valve are closed and the switching valve is opened. The purge diagnosis unit diagnoses whether or not the purge process is normal based on the amount of change in the differential pressure between before and after the opening of the purge valve.

Abstract: A leak diagnosis apparatus for performing leak diagnosis of a fuel tank mounted on a vehicle, includes a calculation unit configured to calculate an amount of change in a pressure in the fuel tank and an amount of change in a temperature of a fuel in the fuel tank while an ignition is turned off, and a determination unit configured to determine whether a leak in the fuel tank is absent or present.

Abstract: The fuel vapor treatment apparatus includes a fuel tank, a canister, a vapor passage, a purge passage, a sealing valve, a purge valve, an outside air introduction passage, a switching valve, and a differential pressure detector. A processing device of the fuel vapor treatment apparatus includes a purge control unit and a purge diagnosis unit. The purge control unit performs a purge process by opening the purge valve in a state where the purge valve and the sealing valve are closed and the switching valve is opened. The purge diagnosis unit diagnoses whether or not the purge process is normal based on the amount of change in the differential pressure between before and after the opening of the purge valve.

Abstract: A leak diagnosis device for a fuel vapor treatment apparatus, comprising: a first diagnosis unit that performs a leak diagnosis of a fuel tank based on a tank internal pressure in a closed state of a sealing valve; a determination unit that opens a sealing valve in a state where a purge valve and a switching valve are closed when the tank internal pressure is within a normal range, and determines whether there is an influence on the valve openability of the switching valve; and a second diagnosis unit that performs a leak diagnosis of the canister based on the tank internal pressure or the canister internal pressure when the determination unit makes a negative determination, and performs a leak diagnosis of the canister based on the canister internal pressure after closing the closed valve when the determination unit makes an affirmative determination.

Abstract: Provided is a device information management system capable of preventing unnecessary information disclosure to competitors.

Abstract: An intake pipe of an evaporated fuel processing device is provided with a throttle valve downstream of a supercharger, and an ejector in parallel to the supercharger. A purge passage is branched into first and second branch passages, which connect to the intake pipe at a position downstream of the throttle valve and to a suction port of the ejector, respectively. In the ejector, its intake port is connected to the intake pipe at a position between the supercharger and the throttle valve, and its exhaust port is connected to the intake pipe at a position upstream of the supercharger. A flow rate of purge gas in the second branch passage is obtained based on at least two of a first pressure downstream of the throttle valve, a second pressure between the supercharger and the throttle valve, and a third pressure upstream of the supercharger.

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: A processor may perform a purging process, which may introduce fuel vapor adsorbed by a canister into an intake passage. The processor may identify clogging of a purge passage based on a decrease amount of the pressure in the canister that results from execution of the purging process. The processor may open an isolation valve when the pressure in a fuel tank is less than or equal to a first pressure, which is less than an atmospheric pressure, and close the isolation valve when the pressure in the fuel tank is greater than or equal to a second pressure, which is greater than the first pressure and less than the atmospheric pressure. The processor may disable the purging process at least in a period from when the processor closes the isolation valve to when a prescribed time has elapsed from the closing of the isolation valve.

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: An intake pipe of an evaporated fuel processing device is provided with a throttle valve downstream of a supercharger, and an ejector in parallel to the supercharger. A purge passage is branched into first and second branch passages, which connect to the intake pipe at a position downstream of the throttle valve and to a suction port of the ejector, respectively. In the ejector, its intake port is connected to the intake pipe at a position between the supercharger and the throttle valve, and its exhaust port is connected to the intake pipe at a position upstream of the supercharger.

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: 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 liquid submerged portion fuel leakage diagnostic apparatus includes a tank internal pressure detection portion; a liquid level detection portion; a reference-state liquid level extraction portion configured to extract, as a reference-state liquid level, a liquid level detected by the liquid level detection portion, when a tank internal pressure detected by the tank internal pressure detection portion becomes equal to a reference internal pressure; a fuel consumption detection portion configured to detect consumption of fuel in a fuel tank; and a fuel leakage diagnostic portion configured such that if the fuel consumption is not detected by the fuel consumption detection portion during a period between extraction timings at which the reference-state liquid levels are extracted by the reference-state liquid level extraction portion, the fuel leakage diagnostic portion diagnoses presence or absence of fuel leakage from a liquid submerged portion based on comparison of the reference-state liquid levels.

Abstract: A processor may perform a purging process, which may introduce fuel vapor adsorbed by a canister into an intake passage. The processor may identify clogging of a purge passage based on a decrease amount of the pressure in the canister that results from execution of the purging process. The processor may open an isolation valve when the pressure in a fuel tank is less than or equal to a first pressure, which is less than an atmospheric pressure, and close the isolation valve when the pressure in the fuel tank is greater than or equal to a second pressure, which is greater than the first pressure and less than the atmospheric pressure. The processor may disable the purging process at least in a period from when the processor closes the isolation valve to when a prescribed time has elapsed from the closing of the isolation valve.

Abstract: The vehicle is provided with a canister, a fuel vapor treatment device, a brake booster, which has a constant pressure chamber to which a negative pressure is supplied and is actuated by using a negative pressure supplied to the constant pressure chamber, and a negative pressure pump. The negative pressure pump is provided with a suction port, which is connected to the canister and to the constant pressure chamber, and an ejection port, which is connected to the air intake passage. A second purge control valve for opening and closing a second purge passage is installed in the second purge passage, which puts the canister and the negative pressure pump in communication. A brake negative pressure control valve is installed in the second brake passage, which puts the constant pressure chamber and the negative pressure pump in communication.

Abstract: A fuel vapor processing apparatus may include a case defining therein a first adsorption chamber, a second adsorption chamber and a non-adsorption chamber communicating between the first adsorption chamber and the second adsorption chamber. The cross sectional flow area of the first adsorption chamber may be smaller than the cross sectional flow area of the second adsorption chamber.

Abstract: A fuel tank system in which a solenoid valve on piping that communicates between a fuel tank and a canister may be reduced in size. A valve member (a diaphragm valve) is disposed in vent piping that communicates between the fuel tank and the canister. A second bypass channel is provided between a back pressure chamber of the diaphragm valve and the canister side of the vent piping. The solenoid valve is disposed in the second bypass channel.

Abstract: A liquid submerged portion fuel leakage diagnostic apparatus includes a tank internal pressure detection portion; a liquid level detection portion; to reference-state liquid level extraction portion configured to extract, as a reference-state liquid level, a liquid level detected by the liquid level defection portion, when a tank internal pressure detected by the tank internal pressure detection portion becomes equal to a reference internal pressure; a fuel consumption detection portion configured to detect consumption of fuel in a fuel tank; and a fuel leakage diagnostic portion configured such that if the fuel consumption is not detected by the fuel consumption detection portion during a period between extraction timings at which the reference-state liquid levels are extracted by the reference-state liquid level extraction portion, the fuel leakage diagnostic portion diagnoses presence or absence of fuel leakage from a liquid submerged portion based on comparison of the reference-state liquid levels.