Fuel-vapor processing system
First Claim
1. A system for processing fuel vapor generated from fuel, comprising:
- a fuel tank including a pressure gauge detecting an internal pressure of the fuel tank;
a gas separation membrane module including a first introduction port introducing fuel vapor generated in the fuel tank, a gas separation membrane separating fuel vapor introduced from the first introduction port into condensed fuel vapor and fuel lean vapor, a condensed-fuel-vapor discharge port disposed on an inlet side of the gas separation membrane and discharging condensed fuel vapor, and a fuel-lean-vapor discharge port disposed on a permeation side of the gas separation membrane and discharging fuel lean vapor;
a first passage that provides fluid communication between the fuel tank and the first introduction port;
a fuel-vapor dissolution device that introduces condensed fuel vapor discharged from the condensed-fuel-vapor discharge port into the fuel tank and dissolves this condensed fuel vapor in fuel;
a canister including a second introduction port introducing fuel lean vapor discharged from the fuel-lean-vapor discharge port, an adsorption part adsorbing fuel vapor in fuel lean vapor introduced from the second introduction port, a second discharge port including a second control valve and discharging vapor having fuel vapor removed, and a desorption device desorbing fuel vapor from the adsorption part;
a fuel-lean-vapor discharge passage that provides fluid communication between the fuel-lean-vapor discharge port and the second introduction port, the fuel-lean-vapor discharge passage including a pump reducing the pressure on the permeation side of the gas separation membrane; and
an electronic control unit (ECU) comprising a first control device that, when the internal pressure of the fuel tank detected by the pressure gauge is at least a predetermined value, drives the pump to actuate the system and opens the second control valve and a second control device that desorbs fuel vapor adsorbed to the canister through the desorption device.
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Accused Products
Abstract
A system for processing fuel vapor includes a fuel tank having a pressure gauge, a gas separation membrane module having a gas separation membrane for separating fuel vapor into condensed fuel vapor and fuel lean vapor, a fuel-vapor dissolution device for introducing condensed fuel vapor discharged into the fuel tank and dissolving this condensed fuel vapor in fuel, a canister having an adsorption part adsorbing fuel vapor in fuel lean vapor and a desorption device desorbing fuel vapor from the adsorption part, and an ECU programmed to, when the internal pressure of the fuel tank detected by the pressure gauge is at least a predetermined value, drive the pump to actuate the system so as to process fuel vapor. An objective of the present invention is to provide a fuel-vapor processing system that can process fuel vapor even during periods when the engine is stopped and does not require separation of fuel vapor at multiple stages, complicated control of the flow rate of fuel vapor and the flow rate of permeated gas, or liquefaction of fuel vapor.
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Citations
3 Claims
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1. A system for processing fuel vapor generated from fuel, comprising:
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a fuel tank including a pressure gauge detecting an internal pressure of the fuel tank; a gas separation membrane module including a first introduction port introducing fuel vapor generated in the fuel tank, a gas separation membrane separating fuel vapor introduced from the first introduction port into condensed fuel vapor and fuel lean vapor, a condensed-fuel-vapor discharge port disposed on an inlet side of the gas separation membrane and discharging condensed fuel vapor, and a fuel-lean-vapor discharge port disposed on a permeation side of the gas separation membrane and discharging fuel lean vapor; a first passage that provides fluid communication between the fuel tank and the first introduction port; a fuel-vapor dissolution device that introduces condensed fuel vapor discharged from the condensed-fuel-vapor discharge port into the fuel tank and dissolves this condensed fuel vapor in fuel; a canister including a second introduction port introducing fuel lean vapor discharged from the fuel-lean-vapor discharge port, an adsorption part adsorbing fuel vapor in fuel lean vapor introduced from the second introduction port, a second discharge port including a second control valve and discharging vapor having fuel vapor removed, and a desorption device desorbing fuel vapor from the adsorption part; a fuel-lean-vapor discharge passage that provides fluid communication between the fuel-lean-vapor discharge port and the second introduction port, the fuel-lean-vapor discharge passage including a pump reducing the pressure on the permeation side of the gas separation membrane; and an electronic control unit (ECU) comprising a first control device that, when the internal pressure of the fuel tank detected by the pressure gauge is at least a predetermined value, drives the pump to actuate the system and opens the second control valve and a second control device that desorbs fuel vapor adsorbed to the canister through the desorption device. - View Dependent Claims (2, 3)
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Specification