| 黄锋.异常燃烧噪声导致的柴油机启动异响研究[J].,2025,44(1):216-222 |
| 异常燃烧噪声导致的柴油机启动异响研究 |
| An Investigation into the abnormal noise of diesel engine starting caused by abnormal combustion noise |
| 投稿时间：2023-08-17 修订日期：2024-12-30 |
| 中文摘要: |
| 摘要:针对搭载2.0L涡轮增压柴油机的某皮卡车型在启动工况出现的异响问题进行排查与诊断，首先利用发动机消声室台架复现了异响，在台架进行异响信号的NVH测试，通过音频回放及信号滤波，确认异响为1～3kHZ宽频噪声；再通过逐缸断油方法，发现仅对第四缸断油后，启动异响完全消失，评估异响可能与第四缸燃烧相关；运用Kibox燃烧分析仪，对启动工况各缸燃烧特性进行分析，发现异响出现在第4缸最先喷油的情况下，且最大压力升高率达42Bar/°，确认抱怨异响为燃烧噪声；进一步测试各缸物理喷油信号，发现第4缸无预喷信号，仅有主喷信号；通过分析该机型同步信号识别方式和喷油程序底层逻辑，发现当前逻辑中，启动过程第一次识别同步信号的时刻在第4缸预喷程序计算时刻之后，导致预喷计算失败，最终将底层喷油中断程序往后推60度曲轴转角，可保证启动工况第4缸预喷顺利喷射，异响得以解决。 |
| 英文摘要: |
| Abstract: In view of the abnormal noise problem in the starting condition of a pickup truck model equipped with a 2.0L turbo diesel engine, the abnormal noise was reproduced by the engine anechoic chamber bench, and the NVH test of the abnormal noise signal was carried out on the bench, and the abnormal noise was confirmed to be 1～3kHZ broadband noise through audio playback and signal filtering; then through the cylinder-by-cylinder oil cutting method, it was found that only after the fourth cylinder was cut off, the abnormal noise completely disappeared, and the abnormal noise was evaluated to be related to the combustion of the fourth cylinder; the Kibox combustion analyzer was used to analyze the combustion characteristics of each cylinder in the starting working condition, and it was found that the abnormal noise appeared in the case of the first fuel injection of the fourth cylinder, and the maximum pressure rise rate is 42Bar/°, confirming that the abnormal noise complained is combustion noise; Further testing of the physical fuel injection signal of each cylinder found that the fourth cylinder had no pilot injection signal, only the main injection signal; By analyzing the synchronization signal recognition method of the model and the underlying logic of the fuel injection program, it is found that in the current logic, the moment when the synchronization signal is recognized for the first time in the starting process is after the calculation moment of the 4th cylinder pre-injection program, resulting in the failure of the pre-injection calculation, and finally the bottom fuel injection interrupt program is pushed back 60 degrees to the crankshaft angle, which can ensure the smooth injection of the 4th cylinder pilot injection in the starting working condition, and the abnormal noise can be solved. |
| DOI： |
| 中文关键词: 启动异响 燃烧噪声 压力升高率 同步信号 喷油中断 |
| 英文关键词: abnormal noise combustion noise rate of pressure rise Synchronization signal Fuel injection interrupt |
| 基金项目:江西省汽车噪声与振动重点实验室开放课题资助项目(JXNVHKB-KFKT-201804) |
|
| 摘要点击次数: 5 |
| 全文下载次数: 3 |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
