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Control of Cylinder Consistency for a Two-Stroke Spark-Ignition Engine

  • Research Article - Mechanical Engineering
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Abstract

To solve the inconsistency problem of multi-cylinders of two-stroke spark-ignition engines and use the air–fuel ratio for the control of cylinder consistency on the basis of the factors that influence the consistency between cylinders, an individual cylinder fuel compensation control strategy based on the air–fuel ratio deviation including feedforward and feedback control was proposed. The basic fuel injection quantity was determined using the feedforward control. Proportion–integration–differentiation feedback control based on the air–fuel ratio deviation helped realize the compensation and correction of individual cylinder fuel. To achieve consistency control between cylinders, engine bench tests for the idle and small-load conditions were conducted on a two-cylinder two-stroke spark-ignition engine. The test results show that the reduced pressure difference between the two cylinders was less than 10%. The head temperature and air–fuel ratio between the two cylinders were also reduced. The air–fuel ratio of the two cylinders was similar to the target value, which indicates that the control strategy has a good control effect.

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Abbreviations

AFR:

Air–fuel ratio

ATDC:

After top dead centre

CA:

Crank angle

ECU:

Electronic control unit

SI:

Spark ignition

UAV:

Unmanned aerial vehicle

UEGO:

Universal exhaust gas oxygen

e :

Air–fuel ratio deviation

ec :

Rate of air–fuel ratio deviation

e(k):

Deviation of PID controller

\(K_{\mathrm{p}}\) :

Proportion coefficient

\(K_{\mathrm{i}}\) :

Integration coefficient

\(K_{\mathrm{d}}\) :

Differentiation coefficient

\(m_{f0}\) :

Basic fuel injection quantity

\({ P}_\mathrm{pav}\) :

Average peak pressure

u(k):

Control parameter of PID controller

U :

Output of controller

\(U_{\mathrm{ek}}\) :

Threshold value

\(U_{\mathrm{fPID}}\) :

Output of the fuzzy PID controller

\(U_{\mathrm{PID}}\) :

Output of the conventional PID controller

\(U_{\mathrm{yek}}\) :

Threshold value of air–fuel ratio

\(y_0 \) :

Target air–fuel ratio

\(y_1 , y_2 \) :

Air–fuel ratio of cylinders 1 and 2

d:

Differentiation

f0:

Initial fuel injection

fPID:

Fuzzy proportion–integration–differentiation

i:

Integration

p:

Proportion

pav:

Average peak pressure

PID:

Proportion–integration–differentiation

yek:

Threshold value of air–fuel ratio

\(\alpha \) :

Throttle position

\(\beta \) :

Output weight of the conventional PID controller

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Acknowledgements

This study was funded by the Introduce Talent Funding for Scientific Research at Nanjing Tech University (Grant No. 3827401744) and National Natural Science Foundation of China (51865031), as well as the Science and Technology Research Project of Jiangxi Provincial Education Department (Grant No. GJJ170789). The research project was also supported by the Jiangsu Province Key Laboratory of Aerospace Power System (Grant No. CEPE2018003).

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Authors and Affiliations

  1. School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing, China

    Rui Liu & Yifan Chen

  2. College of Mechanical and Electrical Engineering, Nanchang Institute of Technology, Nanchang, China

    Jing Sheng

  3. College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, China

    Rui Liu, Jing Sheng, Minxiang Wei & Yongsheng Liang

Authors
  1. Rui Liu
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  2. Jing Sheng
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  3. Minxiang Wei
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  4. Yongsheng Liang
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  5. Yifan Chen
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Correspondence to Rui Liu.

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Liu, R., Sheng, J., Wei, M. et al. Control of Cylinder Consistency for a Two-Stroke Spark-Ignition Engine. Arab J Sci Eng 44, 5671–5678 (2019). https://doi.org/10.1007/s13369-018-3686-0

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  • DOI: https://doi.org/10.1007/s13369-018-3686-0

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