Control strategy for torque enhancement in Miller engines under high-temperature and high-load conditions

doi:10.3969/j.issn.1674-8484.2024.01.010

Abstract

Abstract:

In order to solve the problem that the knocking tendency of Miller cycle hybrid engine increases significantly under high temperature and high load, resulting in serious torque loss, the key control parameters such as intake and exhaust phase, injection ratio and injection phase were optimized through bench tests, and the temperature correction was introduced into the engine control logic according to the operating characteristics of the engine under high temperature and high load. The results show that the detonation can be successfully suppressed by adopting some measures such as intake and exhaust phase optimization. The optimized engine torque is increased by 18.5% under 1 600 r/min high temperature full load condition; The high temperature compensation of intake and exhaust phase, fuel injection parameters and ignition angle, and the decoupling of control parameters under different temperatures are realized, which significantly improves the dynamic performance attenuation under high temperature and high load.

Key words: automobile engineering, hybrid engine, Miller cycle, high temperature and high load, knock, torque, control strategy

CLC Number:

TK411.1

DONG Tuanjie, YANG Yalian, SHANG Ming. Control strategy for torque enhancement in Miller engines under high-temperature and high-load conditions[J]. Journal of Automotive Safety and Energy, 2024, 15(1): 92-98.

Figures/Tables 11

References 25

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缸径 / mm	82.5
活塞行程 / mm	92
排量 / L	1.967
压缩比	11
进气门最大升程 / mm	8
排气门最大升程 / mm	9.3
进气门CA开启持续期 / (o)	177
排气门CA开启持续期 / (o)	226

缸径 / mm	82.5
活塞行程 / mm	92
排量 / L	1.967
压缩比	11
进气门最大升程 / mm	8
排气门最大升程 / mm	9.3
进气门CA开启持续期 / (o)	177
排气门CA开启持续期 / (o)	226

电力测功机	HORIBA HT460
瞬态油耗仪	HORIBA FQ-2100DP
燃烧分析仪	AVL 683
排放分析仪	HORIBA MEXA 7100D
冷却液恒温系统	武汉东测 EME416

电力测功机	HORIBA HT460
瞬态油耗仪	HORIBA FQ-2100DP
燃烧分析仪	AVL 683
排放分析仪	HORIBA MEXA 7100D
冷却液恒温系统	武汉东测 EME416

参数	发动机转速 / (r·min^-1)
参数	1 400	1 600	2 000
进气相位CA / (o)	38	40	45
排气相位 CA/ (o)	-30	-30	-25
油喷射模式	2次	2次	2次
第1次喷油比例，γ₁	0.7	0.7	0.8
第1次喷油相位(BTDC) CA / (o)	300	310	310
第2次喷油相位(BTDC) CA / (o)	100	110	100