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Optimising the cam profile of an electronic unit pump for a heavy-duty diesel engine

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  • Qiu, Tao
  • Dai, Hefei
  • Lei, Yan
  • Cao, Chunlei
  • Li, Xuchu

Abstract

For a fuel system with a tangent cam or a constant-velocity cam, the peak injection pressure continues to rise as the injection duration increases, but overly high peak pressures induce mechanical loads and wear, limiting the maximum engine speed and injection quantity. To improve the performance of an EUP (Electronic Unit Pump) fuel system for heavy-duty diesel engines, this work proposes a new pump cam, namely the constant-pressure cam. It helps the EUP run at a higher speed and deliver larger fuel quantities while maintaining a constant peak injection pressure, which improves the power of the heavy-duty diesel engine. A model based on the EUP was built to determine the three constraints for optimising the constant-pressure cam: 1) the pump pressure should equal the nozzle pressure; 2) the cam speed should decrease with the increase in the injection duration; and 3) the cam acceleration gradient should be zero. An EUP system was tested with the tangent cam and the optimised cam under different conditions. The experimental results show that the EUP system with the optimised cam delivers more injection quantity and runs at higher engine speeds while maintaining the same peak pressure as the tangent cam.

Suggested Citation

  • Qiu, Tao & Dai, Hefei & Lei, Yan & Cao, Chunlei & Li, Xuchu, 2015. "Optimising the cam profile of an electronic unit pump for a heavy-duty diesel engine," Energy, Elsevier, vol. 83(C), pages 276-283.
    • Handle: RePEc:eee:energy:v:83:y:2015:i:c:p:276-283
    DOI: 10.1016/j.energy.2015.02.021
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    References listed on IDEAS

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    1. Soid, S.N. & Zainal, Z.A., 2011. "Spray and combustion characterization for internal combustion engines using optical measuring techniques – A review," Energy, Elsevier, vol. 36(2), pages 724-741.
    2. Magno, Agnese & Mancaruso, Ezio & Vaglieco, Bianca Maria, 2014. "Experimental investigation in an optically accessible diesel engine of a fouled piezoelectric injector," Energy, Elsevier, vol. 64(C), pages 842-852.
    3. Agarwal, Avinash Kumar & Dhar, Atul & Gupta, Jai Gopal & Kim, Woong Il & Lee, Chang Sik & Park, Sungwook, 2014. "Effect of fuel injection pressure and injection timing on spray characteristics and particulate size–number distribution in a biodiesel fuelled common rail direct injection diesel engine," Applied Energy, Elsevier, vol. 130(C), pages 212-221.
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    1. Zhang, Zheng & Liu, Fushui & Wang, Pei & Hu, Ruo & Sun, Baigang, 2017. "Methodology to parametric design of cam profile for electronic unit pump," Energy, Elsevier, vol. 139(C), pages 170-183.

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