Patent ID: 7054736

Claim:
A method for computing the quantity of injected fuel for an automobile engine equipped with an electronically controlled fuel injection system, the comprising the steps of: computing (step 101 ) a voltage(electric current) pulse width time per minute during operation at idle speeds of 800 rpm by using a voltage(electric current) pulse width applied to an injector in two crank shaft revolution during operation at idle speeds of 800 rpm in a diesel engine; computing (step 102 ) a quantity of injected fuel per the voltage(electric current) pulse width time during operation at idle speeds of 800 rpm by using the voltage(electric current) pulse width time per minute during operation at idle speeds of 800 rpm, which is given by the step 101 and by using the total quantity of injected fuel per minute during operation at idle speeds of 800 rpm; computing (step 103 ) a fuel pressure transform constant by extracting the square root of a fuel pressure in the injector, which is corresponding to an output voltage of a fuel pressure sensor; computing (step 104 ) a selection scale by calculating the fuel pressure transform constant given by the step 103 and an accumulated voltage(electric current) pulse width time; and computing (step 105 ) the total quantity of injected fuel for the diesel engine by using the selection scale given by the step 104 and the quantity of injected fuel per the voltage (electric current) pulse width time during operation at idle speeds of 800 rpm.