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CN109538367B - 车辆冷启动冒黄烟的解决方法 - Google Patents

车辆冷启动冒黄烟的解决方法 Download PDF

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CN109538367B
CN109538367B CN201811433854.3A CN201811433854A CN109538367B CN 109538367 B CN109538367 B CN 109538367B CN 201811433854 A CN201811433854 A CN 201811433854A CN 109538367 B CN109538367 B CN 109538367B
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injection
cold start
vehicle
yellow smoke
temperature
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CN109538367A (zh
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张斌
陶建忠
苗垒
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Wuxi Weifu Lida Catalytic Converter Co Ltd
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Wuxi Weifu Lida Catalytic Converter Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D41/00Electrical control of supply of combustible mixture or its constituents
    • F02D41/30Controlling fuel injection
    • F02D41/38Controlling fuel injection of the high pressure type
    • F02D41/40Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
    • F02D41/402Multiple injections
    • F02D41/405Multiple injections with post injections

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  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
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  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

本发明提供一种车辆冷启动冒黄烟的解决方法,包括:车辆冷启动时,监测冷却液温度T;若冷却液温度满足Tthd1≤T≤Tthd2,则进入冷启动消黄烟喷射模式,否则进入正常喷射模式;冷启动消黄烟喷射模式下,实时监测冷却液温度T,并在主喷后增加近后喷;当冷却液温度T上升至T>Tthd2,取消近后喷,切换进入正常喷射模式。Tthd1取‑20℃,Tthd2取12℃。近后喷的喷射油量为5~10mg/hub,近后喷的喷射提前角为‑30度~‑50度。本发明不需要对现有的发动机本体和SCR后处理模块进行改造,仅仅采用调节喷油器的喷射次数和喷射时刻的技术手段即可成功解决了冷启动冒黄烟的问题,且节省成本。

Description

车辆冷启动冒黄烟的解决方法
技术领域
本发明涉及柴油发动机车辆尾气后处理领域,尤其是一种车辆冷启动冒黄烟的解决方法。
背景技术
目前随着对车辆排放标准的要求,柴油发动机车辆上一般都配置了SCR模块,SCR模块即选择性催化还原模块,在催化剂的作用下,喷入还原剂氨或尿素,把尾气中的NOx还原成N2和H2O。
当在环境温度低于5度时,内置铜基分子筛催化剂SCR模块的车辆冷启动时普遍出现冒黄烟现象;通过分析,原因确定为:
低温下SCR模块中的铜基分子筛会吸附NOx,然后累积;随着SCR模块温度升高,累积的NOx因受热集中释放造成排放峰值;当NOx排放值大于1800PPM时排气会显示为淡黄色,且随着NOx排放值的变大,排气颜色逐渐变为黄色、黄棕色;本质上是一定浓度的NO2显示为黄色;NO2是有毒的气体,当批量车队,例如公司门口的班车车队,或学校门口的校车车队出现该情况,会严重危害人身安全。
柴油发动机车辆现有的喷射方案都是可选的预喷+主喷方式,无法解决车辆冷启动冒黄烟的问题。
发明内容
本发明的目的在于克服现有技术中存在的不足,提供一种车辆冷启动冒黄烟的解决方法,通过在主喷后增加合适喷射量的近后喷,以及控制合适的近后喷的喷射提前角,在不改动硬件设备,无硬件成本增加的前提下,解决了车辆冷启动冒黄烟的问题。本发明采用的技术方案是:
一种车辆冷启动冒黄烟的解决方法,包括:
车辆冷启动时,实时监测冷却液温度T;
若冷却液温度满足Tthd1≤T≤Tthd2,则进入冷启动消黄烟喷射模式,否则进入正常喷射模式;
冷启动消黄烟喷射模式下,实时监测冷却液温度T,并在主喷后增加近后喷;
当冷却液温度T上升至T>Tthd2,取消近后喷,切换进入正常喷射模式。
进一步地,Tthd1取-20℃,Tthd2取12℃。
进一步地,近后喷的喷射油量为5~10mg/hub,近后喷的喷射提前角为-30度~-50度。
更进一步地,近后喷的喷射提前角为-40度。
进一步地,正常喷射模式下,按照预喷+主喷方式或主喷方式进行燃油喷射。
本发明的优点在于:本发明不需要对现有的发动机本体和SCR后处理模块进行改造,仅仅采用调节喷油器的喷射次数和喷射时刻的技术手段即可成功解决了冷启动冒黄烟的问题,且节省成本。
附图说明
图1为本发明的方法流程图。
具体实施方式
下面结合具体附图和实施例对本发明作进一步说明。
本发明采用的车辆冷启动冒黄烟的解决方法,包括:
车辆冷启动时,实时监测冷却液温度T;
若冷却液温度满足Tthd1≤T≤Tthd2,则进入冷启动消黄烟喷射模式,否则进入正常喷射模式,正常喷射模式下,按照预喷+主喷方式进行燃油喷射;也可以不需要预喷;
Tthd1取-20℃,Tthd2取12℃;也就是说冷却液温度在-20℃~12℃范围内的话,则进入冷启动消黄烟喷射模式;
冷启动消黄烟喷射模式下,实时监测冷却液温度T,并在主喷后增加近后喷;
近后喷的喷射油量为5~10mg/hub,即每冲程喷射量5~10mg;近后喷的喷射油量的大小根据实际使用的SCR模块的大小适当调节,例如一个17L体积的SCR模块,对应的近后喷的喷射油量为5~8mg/hub;
近后喷的喷射提前角为-30度~-50度,优选为-40度;
近后喷的喷射油量,以及近后喷的喷射提前角这些数据很关键,不合适的话会造成黄烟问题未解决或因HC喷多造成白烟现象;
当监测的冷却液温度T上升至T>Tthd2,取消近后喷,切换进入正常喷射模式;
上述过程中,在车辆低温冷启动时,主喷后增加了近后喷,会使得发动机气缸内有部分未燃烧的HC进入到SCR模块中,铜基分子筛会优先吸附HC,而不再吸附NOx,可成功解决冷启动冒黄烟问题;
在冷却液温度T上升至T>Tthd2后,再恢复正常喷射模式。
当冷却液温度T<-20℃时,本发明未增加近后喷,这是因为,当温度低于-20℃时,此时发动机缸内燃烧不充分,有一定量的HC会从排气管排出,进入到SCR模块中,铜基分子筛会优先吸附这部分HC,因此不会产生冷启动冒黄烟问题。
本发明无需增加硬件成本,通过发动机的微处理器适当控制喷射模式,即可解决冷启动冒黄烟问题。
最后所应说明的是,以上具体实施方式仅用以说明本发明的技术方案而非限制,尽管参照实例对本发明进行了详细说明,本领域的普通技术人员应当理解,可以对本发明的技术方案进行修改或者等同替换,而不脱离本发明技术方案的精神和范围,其均应涵盖在本发明的权利要求范围当中。

Claims (4)

1.一种车辆冷启动冒黄烟的解决方法,其特征在于,包括:
车辆冷启动时,实时监测冷却液温度T;
若冷却液温度满足Tthd1≤T≤Tthd2,则进入冷启动消黄烟喷射模式,否则进入正常喷射模式;
冷启动消黄烟喷射模式下,实时监测冷却液温度T,并在主喷后增加近后喷;
当冷却液温度T上升至T>Tthd2,取消近后喷,切换进入正常喷射模式;
Tthd1取-20℃,Tthd2取12℃。
2.如权利要求1所述的车辆冷启动冒黄烟的解决方法,其特征在于,
近后喷的喷射油量为5~10mg/hub,近后喷的喷射提前角为-30度~-50度。
3.如权利要求2所述的车辆冷启动冒黄烟的解决方法,其特征在于,
近后喷的喷射提前角为-40度。
4.如权利要求1所述的车辆冷启动冒黄烟的解决方法,其特征在于,
正常喷射模式下,按照预喷+主喷方式或主喷方式进行燃油喷射。
CN201811433854.3A 2018-11-28 2018-11-28 车辆冷启动冒黄烟的解决方法 Active CN109538367B (zh)

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