Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (9): 2828-2836.doi: 10.13229/j.cnki.jdxbgxb.20240238

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Effect of thermal insulation coating piston on performance of gasoline engine

Xiang-yang WANG1(),Yu LIU1(),Jia-kun DU2,Hong CHEN2,Fang-xi XIE1,Da-you LU1   

  1. 1.National Key Laboratory of Automotive Chassis Integration and Bionics,Jilin University,Changchun 130022,China
    2.GAC Automotive Research & Development Center,Guangzhou 511434,China
  • Received:2024-03-09 Online:2025-09-01 Published:2025-11-14
  • Contact: Yu LIU E-mail:753403128@qq.com;liuyu1981@jlu.edu.cn

Abstract:

An experimental study was conducted to investigate the effects of an insulated piston on gasoline engine performance under different loads and excess air ratios. The results show that the optimal ignition time is advanced at low load, the ignition delay period and the combustion duration are prolonged;conversely, the combustion center is postponed at high load. Additionally the use of thermal insulation coating pistons has led to an increase in NO x emissions and a decrease in CO and HC emissions; the thermal insulation coating pistons has the same effect on engine performance during both and stoichiometric air dilution combustion at high loads combustion.

Key words: power machinery and engineering, thermal insulation coating piston, stoichiometric combustion, air dilution combustion, engine performance

CLC Number: 

  • TK41

Table 1

Engine specifications"

参数数值
缸径/mm79
活塞行程/mm102
排量/L0.5
压缩比15.8
连杆长度/mm152

Fig.1

Material distribution of piston thermalinsulation coatings"

Fig.2

Comparison of thermal insulation coating pistons before and after experiment"

Table 2

Model and accuracy of main instruments and equipment for engine measurement and control"

仪器设备型号精度
进气模拟增压系统AVL 515±50 108 Pa
油水恒温控制单元AVL 577±1 ℃
喷油控制单元Scienlab DICU
瞬态测功机ACWA-100 5-4-290

扭矩:±0.03%

转速:±1 r/min

缸压传感器Kistler 6054BR±0.3%
角标仪AVL 365C± 0.5 °CA
燃烧分析仪AVL INDIMCRO 602
瞬态油耗仪AVL 7361 CST±0.05%
气体排放分析仪HORIBA MEXA-7500D

校准检查:±0.5%

重复试验:±0.5%

Fig.3

Schematic diagram of experiment set-up"

Fig.4

Comparison of the optimal spark timing MBT between regular pistons and thermal insulation coating pistons in gasoline engines under stoichiometric combustion"

Fig.5

Comparison of ignition delay period and combustion duration between regular pistons and thermal insulation coating pistons in gasoline engines under stoichiometric combustion"

Fig.6

Comparison of average cylinder pressure and average cylinder temperature between gasoline engines using regular pistons and thermal insulation coating pistons under stoichiometric combustion"

Fig.7

Comparison of CA50 between gasoline engines using regular pistons and thermal insulation coating pistons under stoichiometric combustion"

Fig.8

Comparison of regulated emissions from gasoline engines using regular pistons and thermal insulation coating pistons under stoichiometric combustion"

Fig.9

Ccomparison of GITE, unburned losses, exhaust losses, and heat transfer losses between gasoline engines using regular pistons and thermal insulation coating pistons under stoichiometric combustion"

Fig.10

Comparison of MBT between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

Fig.11

Comparison of ignition delay period and combustion duration between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

Fig.12

Comparison of CA50 between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

Fig.13

Comparison of COVIMEP between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

Fig.14

Comparison of regulated emissions between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

Fig.15

Comparison of GITE, unburned losses, exhaust losses, and heat transfer losses between gasoline engines using regular pistons and thermal insulation coating pistons under high load air dilution combustion"

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