首页|汽油机冷机间歇性抖动问题的研究

汽油机冷机间歇性抖动问题的研究

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汽油机冷起动后,催化器需快速达到较高温度,才能具有一定的转化效率.此阶段的控制策略往往是通过提高转速、减小点火提前角、加浓混合气等手段使排气温度迅速升高,但会影响到NVH性能和驾驶性.针对某汽油机催化器加热阶段严重的抖动问题,首先通过对源头和传递路径进行分析和排查,确认起燃阶段燃烧稳定性差是引起抖动的根本原因;然后对相关硬件进行排查,对多组控制参数下的座椅振动、燃烧稳定性进行扫描试验以及对排放进行摸底试验,寻求出一套排放和NVH性能均达标的控制参数;最后通过调整挡位转速控制策略,解决起步阶段突兀的驾驶性问题,使该汽油车型冷机怠速工况各性能指标均达标.
Research on the Problem of Intermittent Jitter of Cold Idle of Gasoline Engine
After the cold start of the gasoline engine,the catalytic converter needs to reach a higher tem-perature quickly in order to have a certain conversion efficiency.The control strategy at this stage is often to increase the exhaust temperature rapidly by increasing the speed,reducing the ignition advance angle,and thickening the mixture,but it will affect the NVH performance and drivability.In view of the serious jitter problem in the heating stage of the catalytic converter of a gasoline engine,firstly,through the analy-sis and investigation of the source and transmission path,it was confirmed that the poor combustion stabili-ty in the ignition stage was the root cause of the jitter.Then,the relevant hardware was investigated,and the seat vibration and combustion stability under multiple sets of control parameters were scanned and the emission test was carried out to find a set of control parameters that met the emission and NVH perfor-mance standards.Finally,by adjusting the gear speed control strategy,the abrupt drivability problem in the initial stage was solved,so that the performance indicators of the gasoline model under the cold idle reached the standard.

Gasoline engineCatalytic converter heatingShakeCombustion stabilityControl parameter

黄锋、汪西力、徐小翔、曾小春、王毅

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江铃汽车股份有限公司 江西 南昌 330001

江西省汽车噪声与振动重点实验室

汽油机 催化器加热 抖动 燃烧稳定性 控制参数

江西省汽车噪声与振动重点实验室开放基金

JXNVHKB-KFKT-201804

2024

小型内燃机与车辆技术
天津大学

小型内燃机与车辆技术

CSTPCD
影响因子:0.261
ISSN:1671-0630
年,卷(期):2024.53(1)
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