Diesel engine variable altitude self-adaptive energy regulation and control method

Abstract

The invention discloses a diesel engine variable altitude self-adaptive energy regulation and control method in the technical field of internal combustion engines. The method comprises the following steps: 1, a corresponding relation between average effective pressure and air inlet pressure according to the air inlet quantity and operation parameters of a diesel engine and a corresponding relation between the air inlet quantity and the average effective pressure is obtained; 2, the equivalent turbine area of a supercharger is selected as a control variable, and the turbine exhaust gas flow relation is obtained; 3, according to a supercharger energy balance equation, the corresponding relation between the turbine expansion ratio and the compressor pressure ratio and the corresponding relation between the equivalent turbine area and the supercharger system efficiency are obtained; 4, the corresponding relation between the equivalent turbine area and the altitude and the working condition of the diesel engine is obtained by combining the calculation formulas; and 5, an equivalent turbine area is introduced. The method solves the problems of variable-altitude multi-factor coupling adjustment demand characteristics of the supercharging system and the altitude adjustment capability of the supercharging system, can be popularized to engines of different models, and is suitable for optimization design of the variable-altitude cooperative control method of the engine and the supercharging system.

Description

technical field [0001] The invention relates to a supercharging control method in the technical field of internal combustion engines, in particular to a diesel engine variable altitude self-adaptive energy that satisfies the air intake requirements of diesel engines at different altitudes by adjusting the equivalent area of ​​the turbine to change the matching between the turbocharger and the diesel engine control method. Background technique [0002] The application of turbocharging technology has significantly improved the power performance of the diesel engine, but for two independent thermal systems with different flow characteristics and no mechanical work transfer, there will be some contradictions in their coordinated operation, and it will become more prominent with the increase of the diesel engine's supercharging degree. In traditional supercharging system matching, select the appropriate operating point of the diesel engine as the matching point, select the compre...

AI Technical Summary

Problems solved by technology

However, for vehicle diesel engines, the complex and changeable operating range of all working conditions makes the selected turbocharger not run in the best balanced state, which requires the supercharging system to adopt adjustment and control methods to adapt to different diesel engines. Working condition requirements, to achieve performance optimization

The variable altitude operation requirements of diesel engines upgrade the operating range of diesel engines from two-dimensional full working conditions to three-dimensional spaces with different speeds, loads and altitudes, which adds great difficulty to the formulation of control strategies for booster systems

Since the matching of the traditional supercharging system rarely takes into account the factors of altitude changes, the power and economy decrease and the emission performance deteriorates when operating at variable altitudes

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