Two-level adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjusting control method

Abstract

Disclosed is a two-level adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjusting control method. A diesel engine ECU is combined with a real-time monitored accelerator pedal position, diesel engine rotation speed and altitude to inquire about variable-altitude diesel engine torque MAP, and expected torque of the current working condition is obtained.A torque and gas intake flow corresponding curve is inquired about through the expected torque, and the expected gas inflow quantity of a two-level supercharging system is obtained. According to the expected gas inflow quantity, a high and low pressure level supercharger pressure gas characteristic MAP graph is inquired about, total pressure of the two-level supercharging system is obtained, an NMPC supercharging pressure controller calculates open degrees of a bypass valve at high and low pressure levels according to the difference of the expected pressure and actual pressure, the diesel engine ECU controls the change of the open degree of a blade, and thus the actual supercharging pressure is equal to the expected supercharging pressure. Two-level adjustable supercharged diesel engine supercharging pressure variable-altitude self-adaption can be achieved through the two-level adjustable supercharged diesel engine variable-altitude supercharging pressure self-adaptive adjusting control method, the diesel engine high-altitude transient response characteristic and acceleration characteristic are promoted, and the influences of altitude increasing on power performance and economy ofthe diesel engine are effectively relieved.

Description

technical field [0001] The invention relates to the field of engine control, in particular to a two-stage adjustable supercharging diesel engine variable altitude supercharging pressure self-adaptive regulation control method. Background technique [0002] my country is a large plateau country with the largest plateau area in the world. 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 km2, accounting for about 1 / 4 of the country's land area. When the vehicle is driving on plateau highways (such as the Qinghai-Tibet line, Sichuan-Tibet line, and Yunnan-Tibet line, etc.), the reduction of the intake air quality of the diesel engine will lead to the deterioration of the combustion of the diesel engine, and the technical performance of the power, fuel consumption rate, and heat load will deteriorate significantly. According to statistics, every time the altitude increases by ...

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Problems solved by technology

[0003] In view of the defect that the existing diesel engine supercharging system cannot automatically adjust the supercharging pressure according to the altitude change, the present invention provides a two-stage adjustable supercharging diesel engine variable altitude supercharging pressure self-adaptive adjustment control method, which can realize two-stage Adjustable supercharged diesel engine supercharged pressure variable altitude self-adaptation improves the high-altitude transient response characteristics and acceleration characteristics of the diesel engine, and effectively alleviates the power and economic impact of the diesel engine caused by altitude rise

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