An optimization method of fuel injection strategy for in-cylinder direct injection engine

Abstract

The invention discloses a method for optimizing the fuel injection strategy of an in-cylinder direct injection engine, which comprises the following steps: step 1, simplify the engine operating condition map to minimap; step 2, test the spray characteristics of the fuel injector; step 3 , according to the test conditions and test data of the spray characteristics, the spray model of the simulation tool is revised; in step 4, the DOE design of the fuel injection strategy parameters is carried out, and the simulation tool is used to simulate the oil and gas mixing process in the cylinder, and the oil and gas distribution is adjusted according to the engine operating conditions. According to the requirements, the theoretical optimal fuel injection strategy is obtained. Step 5, bench verification and calibration are performed to complete the minimap fuel injection strategy optimization; Carry out bench verification and calibration, and complete the fuel injection strategy optimization of the engine operating condition map. It can avoid destroying the engine prototype, reduce the development cost and shorten the development cycle.

Description

technical field [0001] The invention relates to the technical field of engine design, in particular to an optimization method for an in-cylinder direct injection engine fuel injection strategy. Background technique [0002] In order to efficiently complete the development of new in-cylinder direct injection engines and seize the market, it is necessary to carry out efficient research and development on each link in the engine development process to shorten the cycle. The optimization of fuel injection strategy is a complex and time-consuming project. There are two main reasons: First, in the face of increasingly stringent fuel consumption and emission requirements, the engine needs to adopt multiple fuel injection strategies, which involve many fuel injection strategy parameters, The dimensions are wide, and there are many optimization combinations through bench calibration, resulting in a long development cycle. Second, there may be deviations in the design of the optimiza...

AI Technical Summary

Problems solved by technology

Among them, fuel injection strategy optimization is a complex and time-consuming project. There are two main reasons: First, in the face of increasingly stringent fuel consumption and emission requirements, the engine needs to adopt multiple fuel injection strategies, involving many fuel injection strategy parameters, The dimension is wide, and there are many optimization combinations through bench calibration, resulting in a long development cycle

Second, there may be deviations in the design of the optimization range of the fuel injection strategy parameters of the bench. If the parameter level is not set reasonably, it will not only fail to find the best EFI strategy, but may also cause engine damage

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