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

  • Rui Liu
  • Jing Sheng
  • Minxiang Wei
  • Yongsheng Liang
  • Yifan Chen
Research Article - Mechanical Engineering
  • 67 Downloads

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.

Keywords

Two-stroke SI engine Cylinder consistency Air–fuel ratio Control strategy UAV 

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

List of Symbols

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

Subscripts

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

Greek Symbols

\(\alpha \)

Throttle position

\(\beta \)

Output weight of the conventional PID controller

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Notes

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).

References

  1. 1.
    Li, P.; Shen, T.; Liu, D.: Idle speed performance improvement via torque balancing control in ignition-event scale for SI engines with multi-cylinders. Int. J. Engine Res. 13(1), 65–76 (2012)CrossRefGoogle Scholar
  2. 2.
    Wei, X.; Mao, X.J.; Xiao, W.Y.; Zhu, K.Q.; Zhuo, B.: Research on control strategy for improving cylinder consistency of diesel engine. Chin. Intern. Combust. Engine Eng. 33(1), 22–26 (2012)Google Scholar
  3. 3.
    Mao, X.J.; Wei, X.; Wang, J.; Tang, H.B.; Zhang, Y.; Zhao, H.; Jiang, Z.H.: Start-of-injection-based software optimization for consistency between the cylinders in common-rail diesel engines. In: Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering, vol. 230, issue no. 5 (2016)Google Scholar
  4. 4.
    Wei, X.; Mao, X.J.; Xiao, W.Y.; Zhu, K.Q.; Zhuo, B.: Experiment-based software optimization for cylinders consistency in electronic unit pump diesel engines. Proc. Inst. Mech. Eng. Part D J. Automob. Eng. 225(225), 354–365 (2011)CrossRefGoogle Scholar
  5. 5.
    Hu, C.M.; Zhang, J.W.; Liu, N.: Individual cylinder air–fuel ratio balance control based on genetic algorithm identification. Chin. Intern. Combust. Engine Eng. 34(6), 13–18 (2013)Google Scholar
  6. 6.
    Niewstadt, M.J.V.; Kolmanovsky, I.V.: Detecting and correcting cylinder imbalance in direct injection engine. J. Dyn. Syst. Meas. Control Trans. ASME 123(3), 413–424 (2001)CrossRefGoogle Scholar
  7. 7.
    Liu, C.W.; Wang, S.Y.; Yang, Q.: Study of high pressure common rail fuel injection system based on OSEKWorks platform. Chin. Intern. Combust. Engine Eng. 25(4), 28–31 (2004)Google Scholar
  8. 8.
    He, W.H.; Shao, Q.; Zhou, X.; Zou, Z.J.; Wei, Z.X.; Xu, Y.W.: Study of flexible developing system for electronically controlled engine. Chin. Intern. Combust. Engine Eng. 24(5), 1–4 (2003)Google Scholar
  9. 9.
    Nakagawa, S.; Numata, A., Hori, T.: Individual cylinder control for air–fuel ratio cylinder imbalance. SAE Technical Paper 2015-01-1624 (2015)Google Scholar
  10. 10.
    Smith, J.; Schulte, C.; Cabush, D.: Individual cylinder fuel control for imbalance diagnosis. SAE Technical Paper 2010-01-0157 (2010)Google Scholar
  11. 11.
    Krenus, R.; Costa, H.: Individual cylinder fuel control application with a switching oxygen sensor. SAE Technical Paper 2010-36-0028 (2010)Google Scholar
  12. 12.
    Burkhard, J.: Individual cylinder fuel control for a turbocharged engine. SAE Technical Paper 2014-01-1167 (2014)Google Scholar
  13. 13.
    Nakagawa, S.; Fukuchi, E.; Numata, A.: A new diagnosis method for an air–fuel ratio cylinder imbalance. SAE Technical Paper 2012-01-0718 (2012)Google Scholar
  14. 14.
    Suzuki, K.; Shen, T.; Kako, J.; Yoshida, S.: Individual A/F estimation and control with the fuel–gas ratio for multi cylinder IC engines. IEEE Trans. Veh. Technol. 58(9), 4757–4768 (2009)CrossRefGoogle Scholar
  15. 15.
    Fantini, J.; Burq, J.: Exhaust intake manifold model for estimation of individual cylinder air fuel ratio and diagnostic of sensor injector. SAE Technical Paper 2003-01-1059 (2003)Google Scholar
  16. 16.
    Li, X.H.; Xu, X.Y.; Oguri, Y.; Yoshida, M.: Study on differences of cylinder-to-cylinder pressure in multi-cylinder gasoline engine. Trans. CSICE 22(2), 142–149 (2004)Google Scholar
  17. 17.
    Liu, Y.M.; Wei, L.; Hua, Z.Y.; Chen, Y.Q.: Research on air–fuel ratio control of electron controlled CNG engine based on Fuzzy PID. Chin. Intern. Combust. Engine Eng. 33(3), 14–19 (2012)Google Scholar

Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.School of Mechanical and Power EngineeringNanjing Tech UniversityNanjingChina
  2. 2.College of Mechanical and Electrical EngineeringNanchang Institute of TechnologyNanchangChina
  3. 3.College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjingChina

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