Abstract: An ignition device is provided for an idle stop & go system (ISG)-equipped vehicle using a liquefied petroleum gas (LPG) as a fuel. A separately installed auxiliary LPG switch detects the ON/OFF state of the LPG switch, drives fuel cut-off solenoid valves, and switches on/off together with the LPG switch. The ON/OFF state of the LPG switch can be determined based on an output voltage of the auxiliary LPG switch, and then ISG control can be implemented. After the fuel cut-off solenoid valves are driven, the fuel pipeline pressure remains in the state before the idle stop to improve the engine starting performance upon restarting. Also, in an emergency, the LPG and auxiliary LPG switches are simultaneously switched off, the fuel cut-off solenoid valves are quickly switched off and the fuel pump motor is stopped to quickly cut off the fuel supply and prevent a secondary accident in advance.

Abstract: An ignition device is provided for an idle stop & go system (ISG)-equipped vehicle using a liquefied petroleum gas (LPG) as a fuel. A separately installed auxiliary LPG switch detects the ON/OFF state of the LPG switch, drives fuel cut-off solenoid valves, and switches on/off together with the LPG switch. The ON/OFF state of the LPG switch can be determined based on an output voltage of the auxiliary LPG switch, and then ISG control can be implemented. After the fuel cut-off solenoid valves are driven, the fuel pipeline pressure remains in the state before the idle stop to improve the engine starting performance upon restarting. Also, in an emergency, the LPG and auxiliary LPG switches are simultaneously switched off, the fuel cut-off solenoid valves are quickly switched off and the fuel pump motor is stopped to quickly cut off the fuel supply and prevent a secondary accident in advance.