Simulation based high-altitude calibration method for high-pressure common rail diesel engine

Abstract

The invention discloses a simulation based high-altitude calibration method for a high-pressure common rail diesel engine. The method comprises the following steps: (1) establishing a model; (2) designing an experiment: dividing an experiment design factor into three layers, wherein the first layer is the altitude, the second layer is a working condition parameter including a rotational speed and a load, and the third layer is an oil injection parameter; (3) constructing a model: separately extracting the altitude, and establishing a high-altitude response model of the high-pressure common rail diesel engine, wherein in the high-altitude response model, the altitude and the load are in different layers, and a global model is combined with a local model; (4) optimizing data: optimizing the data with a genetic algorithm and a mathematic method according to the response model to obtain optimal oil injection parameters in different altitudes and different working conditions; and (5) generating a pulse chart: obtaining pulse chart node data with an interpolation method through optimal values in different working conditions, obtained by data optimization. The method is capable of providing a basic pulse chart for in-situ calibration of plateau, so that the calibration workload can be reduced, the development cycle can be shortened, and the development cost can be reduced; and the calibration workload and the development cost can be reduced by more than 50%.

Description

technical field [0001] The invention belongs to the technical field of engines, and relates to a simulation-based high-altitude calibration method for a high-pressure common rail diesel engine. Background technique [0002] With the increasingly stringent emission regulations and fuel consumption standards, as well as the continuous improvement of vehicle drivability and comfort requirements, engine electronic control technology continues to be applied, engine control parameters continue to increase, and the workload of electronically controlled engine calibration also increases exponentially. . Traditional calibration means and calibration methods cannot meet the calibration requirements. If the full factorial calibration test method is used to calibrate an engine using the latest technology, it may take hundreds of years to complete, and the traditional calibration method is no longer qualified for the calibration requirements of modern engines. For our country, the area...

AI Technical Summary

Problems solved by technology

The special "three-high environment" puts forward special requirements for the high-altitude calibration of electronically controlled diesel engines, especially in the high cost of field tests, long test cycles, and difficult tests, which seriously restrict the development process of the complete machine. Simulation-based High-altitude calibration of electronically controlled diesel engines has become an effective calibration method. This calibration method can provide basic map for plateau field calibration, which is conducive to reducing calibration workload, shortening development cycle, and reducing development costs. However, no relevant research has been reported yet.

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