Vehicular diesel engine highland second-stage adjustable pressurization system and control method thereof

Abstract

The invention discloses a vehicular diesel engine highland second-stage adjustable pressurization system and method. The system comprises a high-pressure stage supercharger, a low-pressure stage supercharger and an electronic control unit; a middle cooler is arranged between a high-pressure stage gas compressor and a low-pressure stage gas compressor; a middle cooler is arranged behind the high-pressure stage gas compressor; the high-pressure stage gas compressor is connected with the high-pressure stage supercharger; the low-pressure stage gas compressor is connected with the low-pressure stage supercharger; the high-pressure stage supercharger and the low-pressure stage supercharger are connected in series; the turbine side of the high-pressure stage supercharger is provided with a containment high-pressure regulating valve; the turbine side of the low-pressure stage supercharger is provided with a low-pressure regulating valve; the gas compressor side of the low-pressure stage supercharger is provided with a gas compressor by-pass valve; the high-pressure regulating valve, the low-pressure regulating valve, the by-pass valve and a turbine blade regulating mechanism of the high-pressure stage supercharger are controlled by an electronic control unit. a secondary middle cooling technology (the middle cooler is arranged between the high-pressure stage gas compressor and the lower-pressure stage gas compressor and the middle cooler is arranged behind the high-pressure stage gas compressor) is adopted, so that the air temperature after pressurization is reduced, the air input is improved, and the power performance and economical efficiency of an diesel engine are ensured.

Description

technical field [0001] The invention relates to the technical field of diesel engine supercharging, and more specifically relates to a vehicle diesel engine plateau two-level adjustable supercharging system and a control method. Background technique [0002] my country is a large plateau country with the largest plateau area in the world, which accounts for about 60% of the country's land area. The Qinghai-Tibet Plateau is the most representative plateau in the world, with an average altitude of more than 4000m and a total area of ​​2.4 million km 2 , accounting for about 1 / 4 of the country's land area, has an extremely important national defense strategic position. The main characteristics of the climate environment in the plateau area are: low atmospheric pressure, thin air, low annual average temperature, and large temperature difference between day and night. Every time the altitude rises by 1000m, the atmospheric pressure drops by about 10kPa, the atmospheric temperat...

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Problems solved by technology

[0004] The main reason for the decline in the performance of vehicle diesel engines working in plateau areas is that due to the high altitude of the plateau, low atmospheric pressure, and low air density, the air quality entering the cylinder is reduced and the combustion is deteriorated, resulting in a decrease in the plateau performance of the diesel engine.

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