US 7,461,634 B2 · Fuel injection amount correction method for pressure boosting fuel injection apparatus

Abstract

A pressure boosting unit (110) is provided in each fuel injection valve of an engine (1). A pressure of fuel to be supplied to the fuel injection valve from a common rail (3) is boosted as required. An ECU (20) causes low pressure injection to be performed with the pressure boosting unit 110 being in a non-operated state, and high pressure injection to be performed with the pressure boosting unit (110) being in an operated state, and the pressure of the fuel being maintained at a boosted pressure. Based on the result, the ECU (20) corrects a fuel injection period of the fuel injection valve. Also, after the correction of the fuel injection period is completed, fuel injection is performed before the pressure of the fuel reaches the boosted pressure after the pressure boosting unit starts to be operated. Based on the result, operation starting timing of the pressure boosting unit is adjusted.

Claims16

Dependent claims

A fuel injection amount correction method for a pressure boosting fuel injection apparatus including i) a common rail that stores fuel having a predetermined pressure and supplies the fuel to a fuel injection valve;

ii) a pressure boosting device that increases the pressure of the fuel to be supplied to the fuel injection valve from the common rail to a boosted pressure that is higher than the predetermined pressure;
and iii) a first controller that opens the fuel injection valve and causes the fuel injection valve to inject the supplied fuel, the pressure boosting fuel injection apparatus controlling a fuel injection characteristic of the fuel injection valve by adjusting a difference between operation starting timing of the pressure boosting device and operation starting timing of the first controller when the pressure boosting device is in an operated state, the fuel injection amount correction method comprising the steps of:
causing the first controller to be operated so as to perform fuel injection when the pressure boosting device is in the non-operated state;
and
correcting the fuel injection amount of the fuel injection valve when the fuel injection is performed based on a deviation between the actual fuel injection amount and a target fuel injection amount while the pressure boosting device is in the non-operated state.

2 more elements

ii) a pressure boosting device that increases the pressure of the fuel to be supplied to the fuel injection valve from the common rail to a target boosted pressure that is higher than the predetermined pressure of the fuel stored in the common rail;
and iii) a first controller that opens the fuel injection valve and causes the fuel injection valve to inject the supplied fuel, the pressure boosting fuel injection apparatus controlling a fuel injection characteristic of the fuel injection valve by adjusting a difference between operation starting timing of the pressure boosting device and operation starting timing of the first controller when the pressure boosting device is in an operated state, the fuel injection amount correction method comprising the steps of:
causing the first controller to be operated so as to perform fuel injection after the pressure of the fuel to be supplied to the fuel injection valve reaches the target boosted pressure after the pressure boosting device starts to be operated;
and
correcting the fuel injection amount of the fuel injection valve.

2 more elements

ii) a pressure boosting device that increases the pressure of the fuel to be supplied to the fuel injection valve from the common rail to a target boosted pressure that is higher than the predetermined pressure;
and iii) a first controller that opens the fuel injection valve and causes the fuel injection valve to inject the supplied fuel, the pressure boosting fuel injection apparatus controlling a fuel injection characteristic of the fuel injection valve by adjusting a difference between operation starting timing of the pressure boosting device and operation starting timing of the first controller when the pressure boosting device is in an operated state, the fuel injection amount correction method comprising the steps of:
causing the first controller to be operated so as to perform fuel injection before the pressure of the fuel to be supplied to the fuel injection valve reaches the target boosted pressure when the pressure boosting device is in the operated state;
and
correcting the operation starting timing of the pressure boosting device when the fuel injection is performed.

2 more elements

Dependencies are inferred from the claim text.

Fuel injection amount correction method for pressure boosting fuel injection apparatus

Life of this patent

Fuel injection amount correction method for pressure boosting fuel injection apparatus

Life of this patent

Abstract

Claims16