高温高负荷下Miller发动机扭矩提升的控制策略

doi:10.3969/j.issn.1674-8484.2024.01.010

摘要/Abstract

摘要：

为了解决Miller循环混动发动机在高温高负荷下爆震倾向明显增加而导致扭矩损失严重的问题，该研究通过台架试验，对进排气相位、喷油比例和喷油相位等关键控制参数进行了优化，并根据高温高负荷下发动机的工作特性，在发动机控制逻辑中引入温度修正。结果表明：进排气相位优化等措施成功抑制了爆震；优化后的发动机在1 600 r/min高温全负荷工况下扭矩提升了18.5 %；并且实现了对进排气相位、喷油参数和点火角的高温补偿，以及不同温度下控制参数的解耦，显著改善了高温高负荷下的动力性能衰减。

关键词: 汽车工程, 混动发动机, Miller循环, 高温高负荷, 爆震, 扭矩, 控制策略

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

中图分类号:

TK411.1

董团结, 杨亚联, 尚明. 高温高负荷下Miller发动机扭矩提升的控制策略[J]. 汽车安全与节能学报, 2024, 15(1): 92-98.

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.

图/表 11

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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