Diesel altitude-variable self-adapting supercharging control method and system

Abstract

The invention discloses a method and a system for controlling a variable-altitude self-adapting supercharging for a diesel engine, relating to the technical field of supercharging control for a diesel engine, which is characterized in that an optimal supercharging pressure MAP is inquired to obtain the optimal supercharging pressure under the working condition of a stable state according to an inlet pressure signal of an air compressor, a rotating speed signal of an engine and a position signal of a gasoline throttle, the opening of a nozzle ring of a turbine is controlled by using a PI controller according to the difference value between the optimal supercharging pressure and the actual supercharging pressure to obtain an optimal circulating section; an optimal opening MAP of the nozzle ring is inquired to obtain the optimal opening of the nozzle ring under the working condition of a transient state according to the rotating speed signal of the engine and the inlet pressure signal of the air compressor so as to control the optimal circulating section. The system comprises a diesel engine, an intercooler, a variable-section supercharger consisting of an air compressor and a variable-section turbine, an electronic control unit, a pressure sensor and a temperature sensor etc. The method and system can adapt to the altitude variation and adjust the circulating section of the variable-section turbine so that the diesel engine has optimal dynamic property and fuel economy at each altitude.

Description

Technical field: [0001] The invention relates to the technical field of diesel engine supercharging control, in particular to a variable cross-section supercharging system capable of self-adaptive adjustment according to the change of plateau altitude. technical background: [0002] my country has the largest plateau region in the world. The plateau area above 1000 meters above sea level accounts for about 58% of the country's total area, and the plateau area above 2000 meters accounts for about 33%. The Qinghai-Tibet Plateau is the most representative plateau in my country and even in the world, with an average altitude of over 4,000 meters. The Qinghai-Tibet Plateau not only has a high average altitude, but also has the characteristics of a wide range of altitude changes. The maximum altitude change range of the Qinghai-Tibet, Sichuan-Tibet and Xinjiang-Tibet highways can reach 4,000 meters. [0003] As the altitude increases, the atmospheric pressure decreases and the in...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art and to design a diesel engine variable altitude self-adaptive supercharging control method and system for the defect that the existing supercharging system cannot adapt to altitude changes

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