METHOD FOR CONTROLLING THE FREE RUN OF A CAR FUEL PUMP CAPABLE OF PREVENTING THE DAMAGE OF FUEL PUMP BY NOT ALLOWING THE FUEL PUMP TO PERFORM THE FREE RUN OPERATION EVEN IN THE STATE WHERE THE FUEL IS NOT ABSENT IN A FUEL TANK

摘要

PURPOSE: A method for controlling the free run of a car fuel pump is provided to perform the free run operation by a fuel pump receiving the control signal of electric control unit only in a state where the at least predetermined amount of fuel is filled in a fuel tank, thereby preventing the damage of fuel pump due to the over-heating.;CONSTITUTION: A method for controlling the free run of a car fuel pump comprises the following steps of: detecting the amount of fuel in a fuel tank (4) in a state where a battery (1) is connected and a starter switch (2) is on; comparing the reference amount of fuel that is required for the operation signal of free run to the detection amount of fuel; and generating an operation control signal to the fuel pump so as to perform the free run operation by a fuel pump (5) being driven only in a case where the detection amount of fuel is above the reference amount of fuel.;COPYRIGHT KIPO 2013;[Reference numerals] (1) Battery; (2) Starter switch; (AA) Engine; (BB) Operation signal of free run; (CC) Signal value for OBD diagnosis; (DD) Fuel amount detection signal value for free run operation; (EE) Fuel amount detection signal value for displaying the remaining amount of fuel