Double-VGT two-stage adjustable supercharged diesel engine variable altitude simulation test system and method

Abstract

The invention discloses a double-VGT two-stage supercharged diesel engine variable altitude simulation test system and method. The double-VGT two-stage adjustable supercharged diesel engine variable altitude simulation test system comprises an environment pressure simulation system, an engine power measuring system, a combustion analysis system, a calibration system, a high-pressure stage VGT, namely, an HVGT, a low-pressure stage VGT, namely, an LVGT, a diesel engine control unit ECU and a supercharger control unit TCU, the ECU controls the oil injection quantity, the oil injection advance angle and the common rail pressure in real time, and the TCU controls the blade opening degree of the high-pressure stage VGT and the blade opening degree of the low-pressure stage VGT. According to the method, under the conditions of variable altitudes and variable working conditions, based on the optimal MAP of oil injection parameters and pressurization control parameters obtained through coupling optimization of a neural network and a genetic algorithm, an eight-factor and three-level orthogonal test is designed, and a two-stage pressurization and oil injection parameter variable-altitude collaborative calibration test is carried out. Oil-gas-chamber optimal matching of a 0-5500 m diesel engine is achieved, and the variable altitude and variable working condition dynamic property and economical efficiency of the diesel engine are greatly improved.

Description

technical field [0001] The invention relates to the technical field of engines, in particular to a variable-altitude simulation test system and test method for a double-VGT two-stage supercharged diesel engine. Background technique [0002] When the vehicle is driving on plateau highways (such as Qinghai-Tibet line, Sichuan-Tibet line, and Yunnan-Tibet line, etc.), it has the characteristics of high altitude, large drop, steep slope, many long slopes, and complicated working conditions. The reduction of intake air charge will lead to the deterioration of diesel engine combustion , Power, fuel consumption rate, thermal load and other technical performance degradation is obvious. In order to optimize the in-cylinder combustion process of diesel engines with variable altitude and variable working conditions, it is necessary to jointly calibrate the two-stage supercharging and fuel injection parameters of diesel engines at different altitudes. With the increasing demand for dies...

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Problems solved by technology

[0003] Aiming at the technical defect of the existing two-stage adjustable supercharged diesel engine plateau simulation calibration test workload is large, the present invention provides a double VGT two-stage supercharged diesel engine variable altitude simulation test system and test method, and designs a positive calibration based on simulation optimization. According to the change of altitude and working conditions, the two-stage supercharging control parameters and fuel injection parameters of the diesel engine are calibrated collaboratively, and the power and economy of the diesel engine are greatly improved within the altitude range of 0m-5500m.

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