Diesel common rail pressure and rotation speed coupling control system based on sliding mode variable structure

Abstract

The invention discloses a diesel common rail pressure and rotation speed coupling control system based on a sliding mode variable structure. The diesel common rail pressure and rotation speed couplingcontrol system based on the sliding mode variable structure comprises a fuel injector, a fuel injector control unit, a high pressure common rail tube, a rotation speed sensor and a control valve, wherein common rail pressure in the high pressure common rail tube is set and controlled by an engine control system, and adjusted along with changes of engine load, the control valve comprises an electromagnetic valve located on a fuel inlet pipeline of the high pressure common rail tube and used for changing the capacity of a hydraulic cavity, a counterbalance valve located on a fuel return pipeline of the high pressure common rail tube, a pilot-operated type overpressure regulating valve located on the upper stream of the high pressure common rail tube and used for overpressure protection, anda pilot valve which controls fuel injection quantity by changing pressure of front and rear cavities of a piston in a piston type flow switch, a non-linear relationship between the rotation speed andthe fuel injection quantity of a diesel is represented through a non-linear speed regulating system model based on the sliding mode variable structure, and stability of fuel injection is guaranteed by using the non-linear speed regulating system model and controlling the control valve. The diesel common rail pressure and rotation speed coupling control system based on the sliding mode variable structure guarantees stability of the fuel injection, and is good in reliability, stability and robustness.

Description

technical field [0001] The invention belongs to the field of marine diesel engines, and in particular relates to a diesel engine common rail pressure and rotational speed coupling control system based on sliding mode variable structure. Background technique [0002] Diesel engines have been widely used in industry, agriculture, national defense and other fields, and extensive research has been carried out on the transformation of diesel engine full electronic control. Since the 1990s, countries around the world have taken diesel engine electronic control technology as one of the indicators to measure the advanced nature of diesel engines. . Energy shortage, environmental protection issues, development of microelectronics technology and control theory, and improvement of automation requirements have promoted the development of diesel engine electronic control technology, especially digital electronic control technology innovation with computer as the core, centered on electro...

AI Technical Summary

Problems solved by technology

Most of the control systems of diesel engines at home and abroad use the fuzzy-PID control method to control parameters such as temperature, pressure and speed, but the control effect of some parameters and systems is not very ideal, and the reliability, stability and robustness are all poor. There are deficiencies

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