Diesel engine starting oil quantity slope control method based on instantaneous rotating speed and storage medium

Abstract

The invention aims to provide a diesel engine starting oil quantity slope control method based on an instantaneous rotating speed and a storage medium. The method is realized by adopting a slope statemachine in an ECU. When the real-time rotating speed of a diesel engine is larger than the slope starting rotating speed threshold value, the state is switched into a starting state; the starting oilquantity is increased from the starting oil quantity to the target oil quantity in a slope manner according to the slope algorithm of Q1; when the instantaneous rotating speed of the engine is largerthan the transition rotating speed, the current oil injection quantity is assigned to the transition oil quantity and frozen to serve as the slope starting oil quantity of the transition stage; and after the state is switched to the transition state, the starting oil quantity is reduced from the transition oil quantity during state switching to the idling stable oil quantity in a slope manner according to the slope algorithm of Q2. The method has the beneficial effects that firstly, fires caused by over-concentration of mixed gas can be avoided in the starting stage, and smooth starting of the diesel engine is guaranteed; and secondly, in the transition stage, stable transition from starting to idling is achieved, the situation that mixed gas is too thin to cause fires in the transition stage is avoided, and therefore HC emission in the starting transition stage is reduced.

Description

technical field [0001] The invention relates to a method for controlling the fuel injection quantity in the starting process of a diesel engine, in particular to a method for controlling the fuel quantity ramp of a diesel engine starting based on an instantaneous rotational speed and a storage medium. Background technique [0002] Due to its high thermal efficiency, durability and reliability, diesel engines are widely used in various industries, and their operating environments are different. The starting strategy of the diesel engine should meet the starting performance of the diesel engine in different environments, such as cold start, high altitude start, etc. Therefore, environmental conditions such as coolant temperature, intake air temperature and atmospheric pressure are taken into account in the calculation of diesel engine starting oil volume, so that the diesel engine can start smoothly under different environmental conditions. [0003] The starting process is an...

AI Technical Summary

Problems solved by technology

However, the intake air volume is small during the starting process of the diesel engine, and too rich mixture will greatly increase the HC emission during the starting process of the diesel engine.

In addition, if the amount of starting oil is too large, the speed of the diesel engine will rise sharply at the end of starting, which will affect the adjustment process of idle speed PID

The speed upshoot causes the idle PID to calculate too small fuel volume, which makes the mixer too lean in the transition stage, misfire occurs, and the HC emission performance of the diesel engine deteriorates

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