Diesel engine control method and device

Abstract

The invention provides a diesel engine control method and device. The method is applied to a diesel engine controller and comprises the steps that under the circumstance that the preset smoke intensity limit working condition at present is met, the preset air-fuel ratio corresponding to the preset smoke intensity limit working condition is obtained; the air-fuel ratio is processed to obtain a newair-fuel ratio, and the new air-fuel ratio is larger than the air-fuel ratio; the current air inflow of a diesel engine is obtained, and the target fuel-injection quantity is calculated according to the current air inflow and the new air-fuel ratio; and the diesel engine is controlled to conduct fuel injection operation according to the target fuel-injection quantity. According to the diesel engine control method and device, on the one hand, the fuel-injection quantity of the diesel engine can be limited by setting the air-fuel ratio, on the other hand, under the circumstance that the currentair inflow is fixed, compared with the air-fuel ratio, the new air-fuel ratio is smaller than the target fuel-injection quantity obtained through calculation, and accordingly, the fuel-injection quantity of the diesel engine is further limited. Thus, the problem that under the smoke intensity limit working condition, due to the fact that the fuel-injection quantity is large, the air inflow is obviously low and is increased slowly, and smoke occurs can be relieved and even solved.

Description

technical field [0001] The invention relates to the technical field of diesel engines, more specifically, to a method and device for controlling a diesel engine. Background technique [0002] At present, most diesel engines use supercharging and intercooling technology, and turbo lag is common. Coupled with the resistance of the intercooler and the long intake pipeline, it is easy to stop when the vehicle is stationary and the accelerator pedal is stepped on suddenly or the vehicle is stable. When the accelerator is suddenly released at high speed and then stepped on suddenly, due to the large amount of fuel injection, the intake air volume is obviously low and the rise is slow, resulting in smoke. Contents of the invention [0003] In view of this, in order to solve the above problems, the present invention provides a control method and device. The technical solution is as follows: [0004] A method for controlling a diesel engine, applied to a diesel engine controller,...

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Problems solved by technology

[0002] At present, most diesel engines use supercharging and intercooling technology, and turbo lag is common. Coupled with the resistance of the intercooler and the long intake pipeline, it is easy to stop when the vehicle is stationary and the accelerator pedal is stepped on suddenly or the vehicle is stable. When the accelerator is suddenly released at high speed and then stepped on suddenly, due to the large amount of fuel injection, the intake air volume is obviously low and the rise is slow, resulting in smoke

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