Journal of Jilin University(Engineering and Technology Edition) ›› 2024, Vol. 54 ›› Issue (11): 3095-3102.doi: 10.13229/j.cnki.jdxbgxb.20230319

   

High specific power gasoline engine cylindrical working load consistency analysis

Hui-chao ZHAO(),Hua LI(),Ling-hai HAN,Ping-hui HUANG,En-wei JIANG,Ming CHEN,Ze-tian SUN,Yan-feng GONG   

  1. New Energy Development Institute，China FAW Co. ，Ltd. ，Changchun 130013，China
  • Received:2023-04-06 Online:2024-11-01 Published:2025-04-24
  • Contact: Hua LI E-mail:zhaohuichao@faw.com.cn;lihua1@faw.com.cn

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Abstract:

Simulation analysis and experimental research were conducted to investigate the problem of operating consistency deviation of each cylinder in a high specific power V8 engine. Through the simulation analysis， the causes of the differences in the operation of each cylinder were clarified， the cam profile was optimized， and the effects of the profile optimization proposal for engine test on the operation consistency， power and economy performance of the V8 engine were analyzed. The test results show that the optimized intake cam profile can significantly improve the load deviation among cylinders under high speed and high load conditions， with a maximum improvement of 3.1% in the load consistency of each cylinder， while the engine full load， economy and emissions performance are the same as the base profile. The engine performance under partial load conditions are comparable to the basic profile， which confirms the effect of profile optimization.

Key words: gasoline engine, high specific power, consistency, firing order, pressure fluctuation, cam profile optimization

CLC Number: 

  • TK411

Fig.1

Test bench sensor layout"

Fig.2

V8 engine testbed"

Table 1

Engine Specification"

项目单位指标
发动机形式-V型90°夹角
发动机冷却方式-液冷
缸数-8
每缸气门数-4
气门驱动形式-DOHC
排量L3.998
缸盖燃烧室形状-篷顶
供油方式-缸内直喷
供油压力MPa35
进气形式-双涡轮增压
润滑油SAE5W40
燃油标号RON98#

Fig.3

GT-Power model of V8 engine"

Fig.4

Simulated and experimental cylinder pressure comparison"

Fig.5

V8 engine cross-plane crankshaft"

Fig.6

Firing order of V8 engine"

Fig.7

Intake manifold pressure fluctuation with uneven firing intervals"

Fig.8

Intake manifold pressure fluctuation with even firing intervals"

Fig.9

Pressure traces of V8 engine at full load condition"

Fig.10

Indicated mean effective pressure of different cylinders at full load"

Fig.11

IMEP of different cylinders at 6 000 r/min full load"

Fig.12

Cylinder No.3 pressure traces analysis at 6 000 r/min full load"

Fig.13

Optimized cam profiles"

Fig.14

IMEP variation at 5 000 r/min full load"

Fig.15

IMEP variation at 6 000 r/min full load"

Fig.16

Performance comparison at different operating points"

Fig.17

Test results at full load"

Fig.18

Coefficient of IMEP variation at part load"

Fig.19

IMEP deviation at part load"

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