1. Stochastic Air-Fuel Ratio Control of Compressed Natural Gas Engines Using State Observer
- Author
-
Yang Jun, Zhou Xuesheng, Wang Jian, and Li Yanxiao
- Subjects
Article Subject ,020209 energy ,General Mathematics ,02 engineering and technology ,Air mass (solar energy) ,Residual ,Cylinder (engine) ,law.invention ,Search engine ,020401 chemical engineering ,Control theory ,law ,QA1-939 ,0202 electrical engineering, electronic engineering, information engineering ,State observer ,Physics::Chemical Physics ,0204 chemical engineering ,Physics::Atmospheric and Oceanic Physics ,Computer simulation ,General Engineering ,Compressed natural gas ,Engineering (General). Civil engineering (General) ,Environmental science ,Air–fuel ratio ,TA1-2040 ,Mathematics - Abstract
In this paper, the air-fuel ratio regulation problem of compressed natural gas (CNG) engines considering stochastic L2 disturbance attenuation is researched. A state observer is designed to overcome the unmeasurability of the total air mass and total fuel mass in the cylinder, since the residual air and residual fuel that are included in the residual gas are unmeasured and the residual gas reflects stochasticity. With the proposed state observer, a stochastic robust air-fuel ratio regulator is proposed by using a CNG engine dynamic model to attenuate the uncertain cyclic fluctuation of the fresh air, and the augmented closed-loop system is mean-square stable. A validation of the proposed stochastic robust air-fuel ratio regulator is carried out by the numerical simulation of two working conditions. The accuracy control of the air-fuel ratio is realized by the proposed stochastic robust air-fuel ratio regulator, which in turn leads to an improvement in fuel economy and emission performance of the CNG engines.
- Published
- 2020