Diesel injection control method and device for dual-fuel engine

Abstract

The invention discloses a diesel injection control method for a dual-fuel engine, comprising the following steps of: if the engine is operated in a dual-fuel working mode, obtaining a second injection time and a second injection period of a fuel injector of the engine in the duel-fuel working mode according to a first injection time and a first injection period of the fuel injector of the engine in a pure diesel working mode, as well as the current operating condition of the engine; and controlling the fuel injector to start injecting at the second injection time, and controlling the fuel injector to inject in the second injection period. The invention also discloses a diesel injection control device for the duel-fuel engine.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a diesel injection control method and device for a dual-fuel engine. Background technique [0002] Diesel / gas dual-fuel engine refers to a dual-fuel engine that uses a small amount of diesel as the pilot fuel and gas as the main fuel. Gas dual-fuel engine and electronically controlled diesel / gas dual-fuel engine. [0003] For non-electrically controlled diesel / gas dual-fuel engines, the control of diesel injection is realized by controlling the stepper motor to drive the throttle rack, mainly using the controller to obtain the range of throttle action, once the throttle action is detected, the fuel injector is controlled Start fuel injection, and then control and drive the displacement of the throttle rack according to the action range of the throttle, so as to realize the control of the fuel injection quantity. [0004] However, in the above method, the timing of diesel inject...

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Problems solved by technology

[0004] However, in the above method, the diesel injection timing cannot be controlled according to the operating conditions of the system; due to the low precision of the stepping motor, precise control of the diesel injection quantity cannot be realized; due to the slow response speed of the stepping motor, the transient diesel control response Poor performance; therefore, precise control of diesel injection quantity cannot be achieved

In addition, due to the lack of corresponding sensors and electronic actuators, it is impossible to make a judgment on the fault. When the diesel engine fails, the precise control of the diesel injection time and the amount of diesel injection in the fault mode cannot be realized. Long-term operation will cause damage to the engine. Adverse effects, potential safety hazards

It can be seen that the above method cannot control the diesel injection timing and the precise control of the diesel injection amount, so that the engine cannot work in the best state at most operating points

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