Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (1): 55-65.doi: 10.13229/j.cnki.jdxbgxb.20220253

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Influence of valve control strategy to improve un⁃throttle engine performance

You ZHOU1,2(),Wei HONG1,2,Fang-xi XIE1,2(),Yu LIU1,2,Xun GONG3,Xiao-ping LI1,2   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
    2.College of Automotive Engineering，Jilin University，Changchun 130022，China
    3.College of Artificial Intelligence，Jilin University，Changchun 130012，China
  • Received:2022-03-15 Online:2024-01-30 Published:2024-03-28
  • Contact: Fang-xi XIE E-mail:13339550222@163.com;jluxfx@126.com

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Abstract:

In order to achieve efficient and clean combustion， the influence of variable intake valve strategy （VIV）， variable exhaust valve strategy （VEV） and variable intake valve combine exhaust valve strategy （VICE） on the un-throttle engine performance was studied based on a self-developed variable valve lift actuation. The results show that， compared with the original engine， the three valve control strategies all can effectively improve brake specific fuel consumption（BSFC） and indicated thermal efficiency（ITE）. The VICE strategy showed the most optimal results， for example， BSFC and ITE were optimized by up to 28% and 6% compared to the original engine. Both VIV strategy and VICE strategy can reduce pumping loss， especially for VIV strategy， which can reduce pumping loss up to 36% compared with the original engine. All three strategies can reduce NO x emissions， among which VEV strategy performed best. Different valve strategies showed few effects on THC emissions when NMEP exceeded 0.3 MPa.

Key words: internal combustion engine, variable intake and exhaust valves, valve control strategy, un-throttle engine, pumping loss, brake specific fuel consumption, NO x emissions

CLC Number: 

  • TK411

Fig.1

Schematic diagram of variable valve actuation"

Fig.2

Adjustment range of variable valve actuation"

Fig.3

Schematic diagram of test platform"

Table 1

Equipment performance"

仪器型号精度
发动机控制单元Haltech Sprint500/
缸压传感器6114B， Kistler±0.1%
燃烧分析仪AVL 602-6020/
角标仪AVL 398Z01±0.5°CA
氧传感器LS6305 Bosch/
油耗仪FX-3400 Onosokki±0.1% F.S.
排放分析仪A-8020 AVL±0.1% F.S
Lambda仪LA4， ETAS±0.001

Fig.4

Achievable range of NMEP and BSFC"

Fig.5

Heat release rate（HRR） and d2HRR/d2φ underdifferent combustion modes at 0.6 MPa NMEP"

Fig.6

Effects of different valve control strategieson BSFC"

Fig.7

Gas exchange process under differentengine conditions"

Fig.8

Effects of different valve control strategies ongas exchange process"

Fig.9

Effects of different valve control strategies onPMEP/IMEP"

Fig.10

Effects of different valve control strategies oncombustion process"

Fig.11

Effects of different valve control strategies onthe maximum in-cylinder temperature"

Fig.12

Effects of different valve control strategies onexhaust temperature"

Fig.13

Effects of different valve control strategies onindicated thermal efficiency"

Fig.14

Effects of different valve control strategies on NO x emissions"

Fig.15

Effects of different valve control strategies onTHC emissions"

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