Fuel-injection control method and fuel-injection control device

Abstract

Accurate fuel-injection control is effected in response to a fuel-injection request of the engine without being influenced by a variation of the voltage of the power supply and a variation of the coil temperature of the fuel-injection solenoid and by other disturbances. The fuel-injection solenoid is driven / controlled according to the actual current integrated value of the coil current after the start of drive of the fuel-injection solenoid. A fuel-injection control method comprises the steps of starting drive of a fuel-injection solenoid, detecting the actual current integrated value of the coil current flowing through the solenoid after the start of the drive, comparing the actual current integrated value with a reference current integrated value predetermined for the drive pulse width of the solenoid corresponding to the requested fuel-injection amount, and correcting the drive pulse width of the solenoid according to the comparison. The solenoid is driven / controlled according to the corrected drive pulse width.

Description

technical field [0001] The present invention relates to an electronically controlled fuel injection control method and device for supplying fuel to an internal combustion engine (hereinafter referred to as "engine"), and specifically relates to the removal of fuel caused by changes in power supply voltage and temperature. A fuel injection control method and a control device for accurately supplying the fuel injection amount required by the engine side due to the influence of changes in the resistance value of the solenoid coil for injection. Background technique [0002] For vehicle engines including two-wheeled vehicles, providing fuel supply at an appropriate timing is an extremely important factor that affects the overall performance of the engine in response to the fuel injection demand that changes from time to time on the engine side. Therefore, an electronically controlled fuel injection device that electronically controls fuel injection of an engine by a microcompute...

AI Technical Summary

Problems solved by technology

[0008] Therefore, although the fuel injection solenoid can be driven by a constant current, or the injector valve opening time delay can be corrected based on the detected value of the injector drive current (coil current) as disclosed in JP-A-2002-4921, due to The solenoid includes the action start time after power-on, and its action characteristics are affected by the temperature. As a result, it is not only impossible to properly respond to the fuel injection demand of the engine, but also because the drive control circuit and software processing are too complicated Difficulty reducing the size and cost of the fuel injection system as a whole

[0009] In addition, in the driving control device of the fuel injection valve for an engine disclosed in Japanese Patent Application Laid-Open No. 8-4575, the temperature of the electromagnetic coil, which is the main factor for changing the operating characteristics, can be indirectly detected based on the measured fuel temperature. However, the temperature of the electromagnetic coil is not necessarily Always consistent with the fuel temperature, the detection equipment for detecting the fuel temperature must be installed in the fuel tank together with the drive control device of the fuel injection valve for the engine, and this part will lead to a decrease in the fuel storage in the fuel tank

Images