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 inc
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.
대표청구항▼
1. A vaporized fuel processing apparatus comprising: a canister configured to adsorb vaporized fuel generated within a fuel tank such that the adsorbed vaporized fuel is drawn into an engine;a closing valve configured to control communication between the fuel tank and the canister and provided in a
1. A vaporized fuel processing apparatus comprising: a canister configured to adsorb vaporized fuel generated within a fuel tank such that the adsorbed vaporized fuel is drawn into an engine;a closing valve configured to control communication between the fuel tank and the canister and provided in a path connecting the fuel tank and the canister;a float valve configured to prevent fuel from flowing out into the path from the fuel tank;a refueling switch configured to output a refueling start signal that indicates a start of refueling to the fuel tank;an internal pressure sensor detecting a pressure of a space inside the fuel tank as an internal pressure; anda closing valve control device configured to control the closing valve; wherein:if the refueling start signal is output from the refueling switch while the internal pressure of the fuel tank detected by the internal pressure sensor is higher than a set pressure that is previously set, the closing valve control device is configured to open the closing valve within a range in which the float valve does not operate, and the closing valve control device is further configured to increase the valve-opening speed of the closing valve in accordance with a reduction in the internal pressure of the fuel tank from a valve opening start time. 2. The vaporized fuel processing apparatus according to claim 1, wherein the closing valve control device is further configured to perform an opening-degree control of the closing valve from the valve opening start time at least in two stages, in which, in comparison with a first stage at the valve opening start time, an opening degree is larger and a valve opening speed is higher at a second stage after the first stage. 3. The vaporized fuel processing apparatus according to claim 2, wherein the closing valve control device is further configured to control the opening degree of the closing valve in accordance with the internal pressure of the fuel tank at the first stage and open the closing valve stepwise by a predetermined amount at the second stage. 4. The vaporized fuel processing apparatus according to claim 3, wherein, at the first stage, the closing valve control device is further configured to control the valve-opening speed of the closing valve in accordance with the internal pressure of the fuel tank detected by the internal pressure sensor such that the higher the internal pressure, the lower the valve-opening speed. 5. The vaporized fuel processing apparatus according to claim 2, wherein, at the first and second stages, the closing valve control device is further configured to increase stepwise the opening degree of the closing valve. 6. The vaporized fuel processing apparatus according to claim 5, wherein, at the first stage, the closing valve control device is further configured to control the valve-opening amount of the closing valve in accordance with the internal pressure of the fuel tank detected by the internal pressure sensor such that the higher the internal pressure, the smaller the valve-opening amount. 7. The vaporized fuel processing apparatus according to claim 5, wherein, at the first stage, the closing valve control device is further configured to perform the opening-degree control of the closing valve such that a reduction gradient of the fuel tank internal pressure detected by the internal pressure sensor is not equal to a predetermined value or more. 8. The vaporized fuel processing apparatus according to claim 2, wherein the closing valve control device is further configured to switch between the first stage and the second stage when the internal pressure of the fuel tank detected by the internal pressure sensor has reached a predetermined switching pressure. 9. The vaporized fuel processing apparatus according to claim 8, wherein the closing valve control device is configured not to perform the opening degree control of the closing valve at the first stage and performs only the control at the second stage if the internal pressure of the fuel tank detected by the internal pressure sensor at the valve opening start time is lower than the switching pressure. 10. The vaporized fuel processing apparatus according to claim 1, wherein if the closing operation of the float valve is detected, the closing valve control device is further configured to reduce the opening degree of the closing valve by a predetermined amount. 11. The vaporized fuel processing apparatus according to claim 10, wherein the detection of the closing operation of the float valve is effected by detecting that the reduction amount of the fuel tank internal pressure is small in the state in which the closing valve is open. 12. The vaporized fuel processing apparatus according to claim 10, wherein the reduction of the opening degree of the closing valve is performed by a control of closing stepwise the closing valve by a predetermined amount, or by a control of continuously decreasing the opening degree of the closing valve until the float valve opens again. 13. The vaporized fuel processing apparatus according to claim 1, further comprising a lid door opening device configured to open a lid door, which closes a refueling port of the fuel tank, if the refueling start signal is output, while the internal pressure of the fuel tank detected by the internal pressure sensor is lower than the set pressure. 14. A vaporized fuel processing apparatus comprising: a breather pipe configured to circulate vaporized fuel generated inside a fuel tank during refueling to a region of a refueling port of the fuel tank;a canister configured to adsorb vaporized fuel generated inside the fuel tank such that the adsorbed vaporized fuel is drawn into an engine;a closing valve configured to control communication between the fuel tank and the canister and provided in a path connecting the fuel tank and the canister; anda closing valve control device configured to control an opening degree of the closing valve to a predetermined opening degree after starting the refueling, the predetermined opening degree being an opening degree which causes an internal pressure of the fuel tank to become higher than a first pressure that circulates a requisite amount of vaporized fuel to the region of the refueling port of the fuel tank via the breather pipe. 15. The vaporized fuel processing apparatus according to claim 14, wherein the predetermined opening degree is an opening degree that causes the internal pressure of the fuel tank to become lower than a second pressure, the second pressure corresponding to a pressure at which an auto stop function is exerted to stop the refueling by a refueling gun when the fuel tank is filled up. 16. The vaporized fuel processing apparatus according to claim 14, further comprising an internal pressure sensor for detecting a space pressure within the fuel tank as the internal pressure, wherein the closing valve control device is further configured to control, after starting the refueling, the opening degree of the closing valve based on the internal pressure of the fuel tank detected by the internal pressure sensor. 17. The vaporized fuel processing apparatus according to claim 16, wherein the closing valve control device is further configured to close the closing valve by a first predetermined amount when the internal pressure of the fuel tank detected by the internal pressure sensor becomes lower than a first set pressure that is previously set. 18. The vaporized fuel processing apparatus according to claim 16, wherein the closing valve control device is further configured to control the opening degree of the closing valve such that the internal pressure of the fuel tank detected by the internal pressure sensor becomes a second set pressure that is previously set. 19. The vaporized fuel processing apparatus according to claim 16, wherein the closing valve control device is further configured to perform the opening-degree control of the closing valve after having detected a peak of the internal pressure, which is increased by the vaporized fuel generated in the fuel tank when the refueling is started. 20. The vaporized fuel processing apparatus according to claim 16, wherein the closing valve control device is further configured to open the closing valve to a predetermined opening degree or by a second predetermined amount when the internal pressure of the fuel tank detected by the internal pressure sensor has reached to the second pressure.
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이 특허에 인용된 특허 (5)
Devall, Jeffrey E., Electronic fuel tank fill limit control.
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