Conservation law-based air mass flow calculation in engine intake systems

In current engine controls, a number of control methods are based on the air charge estimation in engine intake systems. Since the derivative of the air mass flow through the throttle valve goes to infinity when the intake pressure is close to the upper stream pressure, the relatively large numerica...

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Bibliographic Details
Published in:Science China. Information sciences 2016-11, Vol.59 (11), p.138-149, Article 112210
Main Authors: Fan, Jixiang, Wu, Yuhu, Ohata, Akira, Shen, Tielong
Format: Article
Language:English
Subjects:
Air masses
Algorithms
Computer Science
Conservation
Control methods
Engine inlets
Information Systems and Communication Service
Intake systems
Mass flow
Research Paper
Singularities
System effectiveness
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Summary:In current engine controls, a number of control methods are based on the air charge estimation in engine intake systems. Since the derivative of the air mass flow through the throttle valve goes to infinity when the intake pressure is close to the upper stream pressure, the relatively large numerical error or oscillation occurs near the singularity point when using common algorithms. This paper develops an effective algorithm for calculating the air mass flow in engine intake systems. Utilizing the high-level model description （HLMD）, the system is described by mass and energy conservation laws and therefor the singularity issue at the zero pressure- difference point is transformed into a singularity issue at the corresponding energy point. Then, the implicit midpoint rule, a special symplectic discrete method, is selected to integrate the energy and mass conservation system. The simulation results show that the numerical behaviour of the air mass flow is significantly improved at the singularity point by using the proposed algorithm. The experimental results also verify that the qualitative behaviour of the air mass flow calculated by the proposed algorithm is consistent with the actual physical system.
ISSN:1674-733X
1869-1919
DOI:10.1007/s11432-015-0623-6