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A return fuel cooling system for LPI vehicle having an engine and a bombe connected to each other through a fuel supply line and a fuel return line in the LPI vehicle using LPG fuel to cool high-temperature LPG fuel returning from the engine to the bombe, may include a heat exchanger mounted on the fuel return line, a bypass line connecting upstream and downstream of the fuel return line, wherein the heat exchanger may be interposed between the upstream and the downstream of the fuel return line to make the LPG fuel returning to the bombe bypass the heat exchanger and supply the LPG fuel to the bombe, and a valve included at a portion in which the fuel return line and the bypass line is connected, and selectively opening or closing the fuel return line connected with the heat exchanger according to a temperature of the bombe.

Titel:	Return Fuel Cooling System for LPI Vehicle and Control Method Thereof
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2014
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20140109971 Publication Date: April 24, 2014 Appl. No: 13/711362 Application Filed: December 11, 2012 Assignees: Hyundai Motor Company (Seoul, KR) Claim: 1. A return fuel cooling system for a liquefied petroleum injection (LPI) vehicle having an engine and a bombe connected to each other through a fuel supply line and a fuel return line in the LPI vehicle using LPG fuel to cool high-temperature LPG fuel returning from the engine to the bombe, the return fuel cooling system comprising: a heat exchanger mounted on the fuel return line and configured to heat exchange coolant supplied thereto and circulating from an air conditioning unit, in which the coolant circulates, and the LPG fuel to cool the LPG fuel; a bypass line connecting upstream and downstream of the fuel return line, wherein the heat exchanger is interposed between the upstream and the downstream of the fuel return line to make the LPG fuel returning to the bombe bypass the heat exchanger and supply the LPG fuel to the bombe; and a valve included at a portion in which the fuel return line and the bypass line are connected, and selectively opening or closing the fuel return line connected with the heat exchanger according to a temperature of the bombe to make the LPG fuel flow in the heat exchanger or the LPG fuel flow through the bypass line. Claim: 2. The return fuel cooling system of claim 1, wherein when the temperature of the bombe is lower than a predetermined temperature, the valve is closed to make the LPG fuel returning from the engine detour to the bypass line to make a returning LPG fuel directly flow in the bombe. Claim: 3. The return fuel cooling system of claim 1, wherein the bombe includes a temperature sensor therein, and wherein the temperature sensor measures the temperature in the bombe and outputs a detected signal to an electronic control unit (ECU) of the vehicle. Claim: 4. The return fuel cooling system of claim 3, wherein the ECU is connected with a full automatic temperature control (FATC) configured to control the air conditioning unit, and controls an operation of the valve according to the temperature in the bombe and an operation state of the air conditioning unit through signals output from the temperature sensor and the FATC. Claim: 5. A method of controlling a return fuel cooling system for a liquefied petroleum injection (LPI) vehicle having an engine and a bombe connected to each other through a fuel supply line and a fuel return line in the LPI vehicle using LPG fuel to cool high-temperature LPG fuel returning from the engine to the bombe, the method comprising: (a) detecting a temperature inside the bombe, and making returning LPG fuel bypass or flow in a heat exchanger by selectively opening or closing of a valve disposed on the fuel return line, according to the temperature inside the bombe; (b) detecting whether an air conditioning unit is operated and determining an operation state of the air conditioning unit when the LPG fuel flows in the heat exchanger according to opening of the valve; and (c) controlling the air conditioning unit according to an operation state of the air conditioning unit. Claim: 6. The method of claim 5, wherein the valve is disposed on the fuel return line at an upstream of the heat exchanger and fluid-connected to a downstream of the heat exchanger. Claim: 7. The method of claim 5, wherein the step (a) includes: detecting the temperature of the bombe through a temperature sensor included inside the bombe; determining whether the temperature of the bombe detected through the temperature sensor is equal to or higher than a predetermined temperature; when the temperature of the bombe is lower than the predetermined temperature, closing the valve and making the LPG fuel returning from the engine detour to a bypass line to make the returning LPG fuel directly flow in the bombe; and when it is determined that the temperature of the bombe is equal to or higher than the predetermined temperature, opening the valve, making the LPG fuel flow in the heat exchanger in which coolant supplied from the air conditioning unit flow, and cooling the LPG fuel with the coolant through heat exchange to make the cooled LPG fuel return to the bombe. Claim: 8. The method of claim 7, wherein the bypass line is connected to the fuel return line at an upstream of the heat exchanger via the valve and fluid-connected to a downstream of the heat exchanger. Claim: 9. The method of claim 5, wherein the step (c) includes: compulsorily driving the air conditioning unit when the air conditioning unit is not operated. Claim: 10. The method of claim 5, wherein the step (c) includes: controlling the air conditioning unit according to a map including at least one of a setting temperature selected by a driver, an exterior temperature, an interior temperature, a coolant temperature, cooling efficiency, and a temperature of the LPG fuel when the air conditioning unit is operated. Current U.S. Class: 137/1 Current International Class: 16

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Return Fuel Cooling System for LPI Vehicle and Control Method Thereof