CN109538367B - Solution for yellow smoke emission in cold start of vehicle - Google Patents
Solution for yellow smoke emission in cold start of vehicle Download PDFInfo
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/402—Multiple injections
- F02D41/405—Multiple injections with post injections
Abstract
The invention provides a solution for yellow smoke emission in cold start of a vehicle, which comprises the following steps: monitoring the temperature T of the cooling liquid when the vehicle is in cold start; if the temperature of the cooling liquid meets the condition that T is more than or equal to Tthd1 and less than or equal to Tthd2, entering a cold-start yellow smoke elimination injection mode, and otherwise, entering a normal injection mode; under a cold start yellow smoke elimination injection mode, monitoring the temperature T of the cooling liquid in real time, and increasing near post injection after main injection; when the coolant temperature T rises to T > Tthd2, the near-post injection is cancelled, and the normal injection mode is switched to. Tthd1 was taken at-20 ℃ and Tthd2 was taken at 12 ℃. The oil injection amount of the near-rear injection is 5-10 mg/hub, and the injection advance angle of the near-rear injection is-30 to-50 degrees. According to the invention, the problem of yellow smoke emission in cold start can be successfully solved only by adopting the technical means of adjusting the injection times and the injection time of the oil injector without modifying the conventional engine body and SCR aftertreatment module, and the cost is saved.
Description
Technical Field
The invention relates to the field of diesel engine vehicle tail gas aftertreatment, in particular to a solution for yellow smoke emission in cold start of a vehicle.
Background
At present, with the requirement of vehicle emission standards, diesel engine vehicles are generally provided with an SCR module, namely a selective catalytic reduction module, which injects a reducing agent ammonia or urea under the action of a catalyst to reduce NOx in exhaust gas into N2 and H2O.
When the ambient temperature is lower than 5 ℃, the phenomenon of yellow smoke emission generally occurs when a vehicle with a built-in copper-based molecular sieve catalyst SCR module is cold started; by analysis, the cause was determined as:
the copper-based molecular sieve in the SCR module can adsorb NOx at low temperature and then accumulate; as the temperature of the SCR module increases, the accumulated NOx is released centrally by heating causing emission peaks; when the NOx emission value is larger than 1800PPM, the exhaust gas is displayed to be light yellow, and the color of the exhaust gas gradually changes to be yellow and yellowish-brown as the NOx emission value is larger; NO2, which is a concentration that is essentially yellow in color; NO2 is a toxic gas that can seriously jeopardize personal safety when present in a fleet of bulk vehicles, such as a fleet of regular vehicles at the door of a company, or a fleet of school vehicles at the door of a school.
The existing injection scheme of the diesel engine vehicle is an optional pilot injection and main injection mode, and the problem that yellow smoke is emitted during cold start of the vehicle cannot be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for solving the problem of yellow smoke emission in the cold start of a vehicle. The technical scheme adopted by the invention is as follows:
a solution for yellow smoke emission in cold start of a vehicle comprises the following steps:
monitoring the temperature T of the cooling liquid in real time when the vehicle is started in a cold state;
if the temperature of the cooling liquid meets the condition that T is more than or equal to Tthd1 and less than or equal to Tthd2, entering a cold-start yellow smoke elimination injection mode, and otherwise, entering a normal injection mode;
under a cold start yellow smoke elimination injection mode, monitoring the temperature T of the cooling liquid in real time, and increasing near post injection after main injection;
when the coolant temperature T rises to T > Tthd2, the near-post injection is cancelled, and the normal injection mode is switched to.
Further, Tthd1 was set at-20 ℃ and Tthd2 was set at 12 ℃.
Furthermore, the oil injection amount of the near-rear injection is 5-10 mg/hub, and the injection advance angle of the near-rear injection is-30 to-50 degrees.
Further, the injection advance angle of the near-after injection is-40 degrees.
Further, in the normal injection mode, fuel injection is performed in the pilot injection + main injection mode or the main injection mode.
The invention has the advantages that: according to the invention, the problem of yellow smoke emission in cold start can be successfully solved only by adopting the technical means of adjusting the injection times and the injection time of the oil injector without modifying the conventional engine body and SCR aftertreatment module, and the cost is saved.
Drawings
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
The invention is further illustrated by the following specific figures and examples.
The invention discloses a solution for yellow smoke emission in cold start of a vehicle, which comprises the following steps:
monitoring the temperature T of the cooling liquid in real time when the vehicle is started in a cold state;
if the temperature of the cooling liquid meets the condition that T is more than or equal to Tthd1 and less than or equal to Tthd2, entering a cold-start yellow smoke elimination injection mode, otherwise entering a normal injection mode, and performing fuel injection according to a pilot injection and main injection mode in the normal injection mode; pre-spraying is also not needed;
tthd1 is taken at-20 ℃, Tthd2 is taken at 12 ℃; namely, if the temperature of the cooling liquid is in the range of-20 ℃ to 12 ℃, entering a cold start yellow smoke elimination injection mode;
under a cold start yellow smoke elimination injection mode, monitoring the temperature T of the cooling liquid in real time, and increasing near post injection after main injection;
the injection oil amount of the near-back injection is 5-10 mg/hub, namely the injection amount per stroke is 5-10 mg; the oil injection amount of the near-after injection is properly adjusted according to the size of an actually used SCR module, for example, the oil injection amount of the near-after injection is 5-8 mg/hub in an SCR module with the volume of 17L;
the injection advance angle of the near-rear injection is-30 to-50 degrees, preferably-40 degrees;
the data of the injection oil quantity of the near-rear injection and the injection advance angle of the near-rear injection are very critical, and if not, the yellow smoke problem is not solved or the white smoke phenomenon is caused by excessive HC injection;
when the monitored temperature T of the cooling liquid rises to T > Tthd2, near-post injection is cancelled, and the normal injection mode is switched to;
in the process, when the vehicle is cold started at a low temperature, near-after injection is added after main injection, so that part of unburned HC in an engine cylinder enters the SCR module, the copper-based molecular sieve can preferentially adsorb HC and no longer adsorb NOx, and the problem of yellow smoke emission in cold start can be successfully solved;
after the coolant temperature T rises to T > Tthd2, the normal injection mode is resumed.
When the temperature of the cooling liquid T < -20 ℃, the near-after injection is not increased, because when the temperature is lower than-20 ℃, the combustion in an engine cylinder is insufficient, a certain amount of HC can be discharged from an exhaust pipe and enter an SCR module, and the copper-based molecular sieve can preferentially adsorb the HC, so the problem of yellow smoke emission in cold start cannot be caused.
The invention can solve the problem of yellow smoke emission in cold start by properly controlling the injection mode through the microprocessor of the engine without increasing hardware cost.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (4)
1. A solution for yellow smoke emission in cold start of a vehicle is characterized by comprising the following steps:
monitoring the temperature T of the cooling liquid in real time when the vehicle is started in a cold state;
if the temperature of the cooling liquid meets the condition that T is more than or equal to Tthd1 and less than or equal to Tthd2, entering a cold-start yellow smoke elimination injection mode, and otherwise, entering a normal injection mode;
under a cold start yellow smoke elimination injection mode, monitoring the temperature T of the cooling liquid in real time, and increasing near post injection after main injection;
when the temperature of the cooling liquid T rises to T > Tthd2, near-rear injection is cancelled, and the normal injection mode is switched to;
tthd1 was taken at-20 ℃ and Tthd2 was taken at 12 ℃.
2. The solution to yellow smoke in cold start of vehicle as claimed in claim 1,
the oil injection amount of the near-rear injection is 5-10 mg/hub, and the injection advance angle of the near-rear injection is-30 to-50 degrees.
3. The solution to yellow smoke in cold start of vehicle as claimed in claim 2,
the injection advance angle of the near-rear injection is-40 degrees.
4. The solution to yellow smoke in cold start of vehicle as claimed in claim 1,
and under the normal injection mode, fuel injection is carried out according to a pilot injection mode and a main injection mode or a main injection mode.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811433854.3A CN109538367B (en) | 2018-11-28 | 2018-11-28 | Solution for yellow smoke emission in cold start of vehicle |
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| CN201811433854.3A CN109538367B (en) | 2018-11-28 | 2018-11-28 | Solution for yellow smoke emission in cold start of vehicle |
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| CN109538367A CN109538367A (en) | 2019-03-29 |
| CN109538367B true CN109538367B (en) | 2020-12-15 |
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| CN201811433854.3A Active CN109538367B (en) | 2018-11-28 | 2018-11-28 | Solution for yellow smoke emission in cold start of vehicle |
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Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10103771A1 (en) * | 2001-01-27 | 2002-08-14 | Omg Ag & Co Kg | Method for restoring the catalytic activity of a catalyst which is arranged in the exhaust tract of a diesel engine and has at least one oxidation function |
| KR100906898B1 (en) * | 2006-12-15 | 2009-07-08 | 기아자동차주식회사 | Method for control post injection of diesel engine |
| DE102010055548A1 (en) * | 2010-12-22 | 2012-06-28 | Deutz Ag | Internal combustion engine and method for operating the same |
| US20140093442A1 (en) * | 2011-05-31 | 2014-04-03 | Johnson Matthey Public Limited Company | Dual Function Catalytic Filter |
| JP6011224B2 (en) * | 2012-10-09 | 2016-10-19 | いすゞ自動車株式会社 | Exhaust gas purification system and exhaust gas purification method |
| JP5617988B2 (en) * | 2013-10-28 | 2014-11-05 | 三菱自動車工業株式会社 | Control device for internal combustion engine |
| CN106150732A (en) * | 2015-03-26 | 2016-11-23 | 长城汽车股份有限公司 | The control method of dual fuel engine, system and vehicle |
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