Multi-pulse injection control method of high-pressure common-ail diesel engine injector

Abstract

The invention discloses a multi-pulse injection control method of a high-pressure common-ail diesel engine injector. An engine controller host CPU sends multi-pulse parameters to a parameter storage of a microcontroller through a structure array, the microcontroller directly generates optimized waves containing the main pulse width, the zero pulse width and maintain waves according to the structure array sent by the engine controller host CPU, and the power driving module of the injector is driven by the optimized waves. According to the multi-pulse injection control method of the high-pressure common-ail diesel engine injector, under the effect of optimized wave driving signals, in the start stage of the injector, power tubes in the driving units on the high side and the low side are switched on at the same time, a high-voltage power source carries out driving at the moment, the current rapidly increases to the peak value, and an injector solenoid valve is rapidly opened; after the injector solenoid valve is opened, the current in a solenoid valve coil L falls back through zero pulses, then, a low-voltage power source UL is used for driving, the open state is maintained through PWM maintain waves with the duty ratio ranging from 70% to 90%, oil is continuously injected, and the optimal control over the driving current of the injector is realized.

Description

technical field [0001] The invention relates to a high-pressure common-rail diesel engine fuel injector, in particular to a multi-pulse injection control method for a high-pressure common-rail diesel engine fuel injector. Background technique [0002] In order to meet stricter emission regulations, high-pressure common rail diesel engines adopt strategies such as multi-pulse fuel injection to achieve different combustion modes and paths, so as to achieve ultra-low emissions. For multi-pulse, each fuel injection pulse has its own fuel injection timing and fuel injection duration, and in order to realize the rapid opening and timely closing of the solenoid valve of the fuel injector, each pulse is determined by the main pulse width (high current Level), zero pulse width (low level) and hold wave (PWM wave) to drive the optimized wave, if each injection pulse is completed by interrupt, complex multiple injections require multiple interrupt service routine processing , for a mu...

AI Technical Summary

Problems solved by technology

For multi-pulse, each fuel injection pulse has its own fuel injection timing and fuel injection duration, and in order to realize the rapid opening and timely closing of the solenoid valve of the fuel injector, each pulse is determined by the main pulse width (high current Level), zero pulse width (low level) and hold wave (PWM wave) to drive the optimized wave, if each injection pulse is completed by interrupt, complex multiple injections require multiple interrupt service routine processing , for a multi-cylinder engine, its real-time control tasks will also increase exponentially, which will inevitably occupy too many system interrupt resources, and in severe cases will affect the real-time performance of the system response

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