A Robust Nonlinear Control Method for Engine Air Management System
An air management system and non-linear control technology, applied in the direction of engine control, electrical control, machine/engine, etc., can solve the problem of not being able to satisfy the performance of the engine in steady state and transient conditions at the same time, and achieve easy implementation, The method is simple and the control effect is improved
Inactive Publication Date: 2020-03-20
SOUTHWEST JIAOTONG UNIV
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[0021] To sum up, the control strategies for the air system of modern engines in the prior art cannot well meet the requirements of the actual steady-state and transient operating conditions of modern engines, as well as the requirements of emissions and calibration of modern engine control units (ECUs)
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[0069] The present invention will be further described in detail through specific embodiments below.
[0070] The air system includes an exhaust gas recirculation EGR system and a variable cross-section turbocharger system, wherein the EGR system includes an EGR valve, the turbocharger system includes an air compressor and a booster valve, and the intake system includes an intake throttle valve and an intake intercooler device. Determine the target opening of the EGR valve according to the target exhaust gas flow flowing through the EGR valve; determine the target opening of the cross-section turbocharged VGT valve according to the target exhaust gas flow flowing through the variable-section turbocharger valve; The target exhaust gas flow determines the target opening of the intake throttle valve.
[0071] Method for controlling the air system of a modern engine: Obtaining measurements of the cylinder discharge pressure of a diesel engine and of the air flow through an air co...
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The invention discloses a robust nonlinear control method for an advanced air management system of an engine. Firstly, a physical model characterizing the air system of a modern engine is established, which can be used effectively in various working conditions (including transient and steady state) state) to control the EGR system turbocharger system and intake throttle system, so that the air flow through the air compressor and the cylinder exhaust pipe pressure are as close as possible to the desired target value; when designing the control strategy, consider robust nonlinearity Control method to improve air system control accuracy, improve transient response characteristics and robustness. The method of the invention is easy to implement and can significantly improve the control of the air system of modern engines.
Description
technical field [0001] The invention relates to the field of engine control, in particular to a robust nonlinear control method for an engine air management system. Background technique [0002] With the continuous development of engine theory and technology, exhaust gas recirculation (EGR) system has become an important part of modern engines. Exhaust gas from modern engines usually contains a large amount of nitrogen oxides (NOx), which is a major source of air pollution. With the EGR system, a portion of the exhaust gases produced by modern engines are sent back to the cylinders. Due to the inertness of the recirculated exhaust gas, it will retard the combustion process, making the combustion rate slower, which in turn leads to a lower temperature in the combustion chamber, thereby effectively reducing nitrogen oxides. In addition, increasing the exhaust gas recirculation rate reduces the overall air flow, so the overall pollutant output in exhaust emissions will be red...
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IPC IPC(8): F02D43/00
Inventor 胡广地郭峰
Owner SOUTHWEST JIAOTONG UNIV