Natural gas engine plateau power loss compensation control method

Abstract

The invention discloses a natural gas engine plateau power loss compensation control method. The method comprises a step of determining the altitude range of engine working and obtaining an engine running state through an obtained atmospheric pressure value, a step of obtaining a real-time torque required by the engine according to an engine running state signal and obtaining a corresponding powerloss ratio according to the real-time torque and the altitude range, and a step of generating a corresponding power compensation signal according to the power loss ratio and controlling intake air pressure correction, controlling air-fuel ratio correction or / and controlling ignition advance correction according to the power compensation signal such that the lack of power of the engine is avoided.It can be seen that different ignition advance angle, air intake pressure and air-fuel ratio control is used in different environments of the engine to optimize the overall performance of the engine,the power is ensured, only the setting of a supercharger and an atmospheric pressure sensor is needed, various application environments are satisfied, and the product promotion is expanded.

Description

technical field [0001] The invention relates to the technical field of natural gas engines, in particular to a method for compensating and controlling natural gas engine plateau power loss. Background technique [0002] With the shortage of energy and people's higher and higher requirements for the performance of vehicle engines, the requirements for the economy and power of natural gas engines are getting higher and higher, and the environment in which natural gas engines operate is becoming more and more extensive. Natural gas engines are gradually being used in high-altitude areas more and more. Natural gas is mainly composed of gaseous low-molecular hydrocarbons and non-hydrocarbon gases. The combustion products are mainly carbon dioxide and water vapor. The substances produced are extremely harmful to the health of the human respiratory system. Little, almost no solid residue. Moreover, natural gas is a gas at atmospheric temperature, and its specific gravity is lighte...

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Problems solved by technology

[0003] However, due to the structural difference between the natural gas engine and the diesel engine, when it is in use, the fuel injection is mainly controlled by the intake air volume. Due to the influence of the high altitude on the turbocharger capacity, it is easy to cause problems such as large engine power loss and insufficient power. Thus affecting the performance and application promotion of the entire natural gas engine

[0004] At present, the existing products do not have measures to correct the power of natural gas engines at high altitudes, but only control the intake air volume, air-fuel ratio, and ignition advance angle based on the operating conditions of the engine, lack of environmental testing, lack of relevant corrections, poor adaptability, and affect the product to promote

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