Common rail diesel engine rail pressure control method and system, common rail diesel engine and storage medium

Abstract

The invention discloses a common rail diesel engine rail pressure control method and system, a common rail diesel engine and a storage medium. The method comprises the steps: building a high-pressure oil pump model: building a high-pressure oil pump oil supply rule model according to the structure of a high-pressure oil pump, the characteristics of plunger pump pulse type oil pumping and the characteristics of an oil inlet proportional valve, and finding out the change relation between the oil outlet flow and pressure of the high-pressure oil pump; building an oil injection characteristic model: building a common rail pipe oil outlet rule characteristic mode according to external requirements such as the rotating speed and torque of the diesel engine and basic parameters of the diesel engine; and building a common rail pipe oil quantity balancing module: according to the common rail pipe oil mass balance model, the influence of disturbance of the system on the rail pressure can be counteracted by balancing the oil inlet rule and the oil outlet rule of the common rail pipe as much as possible according to the oil mass balance method, and the fluctuation of the rail pressure is controlled by adjusting the oil inlet rule of the common rail pipe to adapt to the change of the oil outlet amount of the common rail pipe. According to the invention, the problem that most rail pressure control algorithms cannot achieve rail pressure fluctuation, caused by the system itself, in the rail pressure control process through parameter optimization can be solved.

Description

technical field [0001] The invention belongs to the technical field of diesel engine control, and in particular relates to a rail pressure control method and system of a common rail diesel engine, a common rail diesel engine and a storage medium. Background technique [0002] The common rail diesel engine is the main direction of current research. It is widely used by various diesel engine manufacturers for its high-efficiency, stable injection pressure, flexible injection phase, and accurate fuel injection volume. However, the performance of the self-developed common rail diesel engine is uneven. Stability is the key to the common rail diesel engine control technology, which affects the overall performance of the diesel engine. Under the influence of stringent emission requirements and a new round of energy crisis, the adoption of new energy and optimization of diesel engine performance have become the two major development directions of high-power diesel engines, and rail ...

AI Technical Summary

Problems solved by technology

[0003] The research on rail pressure control strategy mostly takes closed-loop control as the research and optimization goal, and uses various algorithms such as optimized PID, neural network, sliding mode, ant colony and genetics to realize the closed-loop tracking of rail pressure, and does not discuss advanced theories and algorithms Due to the high requirements on the computing power of the CPU, these algorithms cannot fundamentally solve the coupling relationship between rail pressure control and fuel injection quantity

Due to the particularity of the oil supply of the high-pressure oil pump and the characteristics of multi-cylinder distributed fuel injection, the diesel engine will inevitably produce pulse-like fluctuations during the working process, and this inherent fluctuation cannot be eliminated, and it will affect the closed-loop control effect. The optimization range becomes narrow and sensitive, which affects the stability of rail pressure control

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