Diesel engine plateau cold-start preheating method

Abstract

The invention provides a diesel engine plateau cold-start preheating method. The diesel engine plateau cold-start preheating method comprises the following steps that after a diesel engine electroniccontrol system is powered on, whether the smaller one of the coolant temperature and the inlet air temperature is lower than -5 DEG C or not is judged, and if yes, inlet air preheating needs to be conducted; a preheating plug is controlled to conduct inlet air heating according to the preheating duration inquired by an MAP picture in the premier preheating process; after premier preheating is completed, a prompt is given, starting is waited, time is recorded for a certain period of time to wait for starting, when the rotation speed meets the starting requirement, waiting is stopped, and the later preheating process starts to be performed. According to the diesel engine plateau cold-start preheating method, an inlet air preheating strategy under the cold-start working condition is built byutilizing a few of environment variables, the preheating process is divided into the singular inlet air hating stage before starting and the inlet air heating stage cooperating with fuel oil injectionafter starting according to the engine state, and the whole preheating process is optimized and accelerated; and through the strategy, under the condition of the limited computing resources distributed by a single chip microcomputer, the preheating process under the plateau extreme environment of which the lowest temperature is -30 DEG C is quickly and effectively controlled in real time.

Description

technical field [0001] The invention belongs to the technical field of diesel engines, and in particular relates to a method for improving the cold start working condition of a diesel engine in a plateau environment by controlling the intake air temperature in stages. Background technique [0002] When a diesel engine vehicle is started in a plateau cold area or in winter, in the first working cycle under low temperature conditions, due to environmental conditions such as low overall temperature of engine components, fast heat dissipation, reduced battery performance, and large oil resistance, it usually needs to inject several times the fuel. , in order to form a flammable mixture that meets the starting requirements. The additional bled fuel also causes significant hydrocarbon emissions for the first few cycles. Therefore, in order to start reliably and quickly, it is necessary to increase the temperature of the gas entering the cylinder in advance, improve the conditions...

AI Technical Summary

Problems solved by technology

The former is simple to implement, but not highly adaptable to the environment; the latter has complex control logic and flexible heating strategy, but requires large computing resources, and real-time performance is restricted by factors such as sensor signals

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