Injection pressure and fuel injection quantity coupling method for low-temperature operation stability of diesel engine

A technology with injection pressure and stable operation, which is applied in fuel injection control, mechanical equipment, engine control, etc., can solve the problems of unfavorable and stable ignition, increased misfire probability, and difficult transition of hot and cold flames smoothly, so as to improve ignition stability, The effect of shortening the ignition delay period and widening the low-temperature ignition limit

Pending Publication Date: 2022-07-29
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

However, the experimental results show that the high injection pressure in the extremely cold environment is not conducive to stable ignition, and even greatly increases the probability of misfire
At the same time, there is a strong coupling effect between injection pressure and fuel injection volume. For example, under high injection pressure and conventional fuel injection volume, there is a phenomenon that it is difficult to transition smoothly between hot and cold flames.

Method used

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  • Injection pressure and fuel injection quantity coupling method for low-temperature operation stability of diesel engine
  • Injection pressure and fuel injection quantity coupling method for low-temperature operation stability of diesel engine
  • Injection pressure and fuel injection quantity coupling method for low-temperature operation stability of diesel engine

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Embodiment Construction

[0021] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0022] The invention provides a coupling method of injection pressure and fuel injection quantity for the low temperature operation stability of a diesel engine. When the atmospheric temperature is lower than -20° C., as the temperature at the end of compression decreases, the injection pressure when fuel is supplied to the combustion chamber of the diesel engine is reduced. At the same time, the method of increasing the fuel injection concentration can ensure the ignition and stable operation of the diesel engine. The coupling method of the present invention is described in detail below by taking a heavy-duty diesel engine with a nozzle hole diameter of 0.2 mm or more, a cylinder diameter of 90 mm or more, and a compression ratio of 13-18 as an example.

[0023] When the compression end temperature is 850K, the corresponding injection pressure is 80MPa...

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Abstract

The invention discloses an injection pressure and fuel injection quantity coupling method for low-temperature operation stability of a diesel engine, and belongs to the technical field of diesel internal combustion engines. And when the atmospheric temperature is lower than-20 DEG C, along with the reduction of the compression end temperature, the ignition and the stable operation of the diesel engine are ensured by adopting a method of reducing the injection pressure when oil is supplied to a combustion chamber of the diesel engine and increasing the injection oil concentration at the same time. According to the invention, the diesel engine can be quickly and stably ignited under the condition that the atmospheric temperature is lower than-20 DEG C, and the combustion efficiency is good.

Description

technical field [0001] The invention belongs to the technical field of diesel internal combustion engines, and in particular relates to a method for controlling injection pressure and fuel injection quantity for improving the low temperature operation stability of a diesel engine. Background technique [0002] Diesel engines are widely used as power sources for daily life and military equipment due to their high thermal efficiency, strong power output capability, and good reliability. However, when it operates in an extremely cold environment (atmospheric temperature below -20°C), it is susceptible to unstable ignition and large cyclic fluctuations, and at the same time, harmful emissions increase. In particular, due to the slow evaporation of spray at low temperature, the oil beam is cooled after hitting the wall, which greatly increases the probability of various unstable ignitions such as misfire, intermittent ignition, and incomplete combustion. [0003] It is generally...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/30
CPCF02D41/30
Inventor 吴晗石智成薄亚卿黎一锴王字满李向荣
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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