초록 ▼

In the fuel injection method and device for engines, information obtained from the differential value of the common rail pressure is used to correct the parameters of the command pulses to the flow control valve and the solenoid valve of each injector and thereby limit deviations of the fuel injecti

In the fuel injection method and device for engines, information obtained from the differential value of the common rail pressure is used to correct the parameters of the command pulses to the flow control valve and the solenoid valve of each injector and thereby limit deviations of the fuel injection characteristic of the injector from the target injection characteristic. From the curves of the differential values R of the common rail pressure Pc, the actual fuel injection parameters for the injectors-injection start timing Tis, gross injection amount Qt, initial injection amount Qe and maximum injection rate Rmax-are obtained. The command pulse output timing (PTpf, PTif) for the flow control valve, which controls the amount of fuel delivered from the fuel pump, and for the solenoid valve of each injector and the gross or initial command pulse width (PWit, PWief) for the solenoid valves of each injector are controlled so that the above parameters agree with the target injection characteristic determined from the corresponding operating states of the engine.

대표청구항 ▼

[ What is claimed is:] [1.] A fuel injection method for a engine having a common rail which stores fuel delivered by a fuel pump, and injectors which are respectively supplied with the fuel from the common rail, comprising:(a) detecting engine operating states by sensors,(b) setting a target injecti

[ What is claimed is:] [1.] A fuel injection method for a engine having a common rail which stores fuel delivered by a fuel pump, and injectors which are respectively supplied with the fuel from the common rail, comprising:(a) detecting engine operating states by sensors,(b) setting a target injection characteristic by a controller based on the detected engine operating state,(c) setting a basic target control amount based on the target injection characteristic,(d) detecting an actual injection characteristic based on a changing ate over time of fuel pressure in the common rail following fuel injection from an individual injector of the engine,(e) setting a final target control amount which is obtained by correcting the basic target control amount based on both the target injection characteristic and the actual injection characteristic, and(f) executing fuel injection from the injector based on the final target control amount.