CN103726934A - Exhaust control method for fully opening hybrid power automobile air damper - Google Patents
Exhaust control method for fully opening hybrid power automobile air damper Download PDFInfo
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- CN103726934A CN103726934A CN201410013412.9A CN201410013412A CN103726934A CN 103726934 A CN103726934 A CN 103726934A CN 201410013412 A CN201410013412 A CN 201410013412A CN 103726934 A CN103726934 A CN 103726934A
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- exhaust
- bypass branch
- branch road
- exhaust bypass
- air damper
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Abstract
The invention belongs to the field of automobile technology, in particular to an exhaust control method for fully opening a hybrid power automobile air damper. According to the control process, first, an exhaust bypass branch communicated with an exhaust main path is arranged on a catalyst of an engine air damper, then, the exhaust bypass branch is opened after the engine fuel cut-off air damper is opened for certain time, and after the engine fuel cut-off air damper is not in the fully-open state, the exhaust bypass branch is closed at the time that an engine begins to output power so as to prevent tail gas from being exhausted from the exhaust bypass branch without going through catalyst. The method can solve the problem that after the air damper is fully open, a large amount of fresh air enters the catalyst, and the catalyst conversion efficiency is reduced and NOx emission is increased due to the catalyst.
Description
Technical field
The invention belongs to automobile technical field, be specifically related to the throttled-wide method of controlling exhaust gas of a kind of hybrid vehicle.
Background technique
Mixed power electric car is combined motor, motor, energy accumulating device (storage battery etc.), matched well between them and optimization control, can give full play to the advantage of internal-combustion engines vehicle and electric vehicle, avoiding deficiency separately, is low emission and the low oil consumption automobile of now tool actual development meaning.Motor is when low load operation, the output torque that its fuel consume provides is all for overcoming pumping loss, if can reduce even to eliminate pumping loss, the fuel consume of motor also can significantly reduce so, existing for eliminating the pumping loss of mixed power electric car, the braking force that effectively reduces motor, adopts motor oil-break WOT technology to reduce pumping loss conventionally.But adopt after motor oil-break WOT technology, more fresh air is pressed in ternary catalyzing unit, fresh air in ternary catalyzing unit too much not only can reduce catalyst temperature, weaken catalytic conversion efficiency, and and a large amount of fresh airs enters into ternary catalyzing unit, also can cause a high-temperature oxygen-enriched reaction region, impel nitrogen to change in a large number oxynitrides, after being discharged in air, environmental pollution is larger.
Summary of the invention
Object of the present invention is exactly the deficiency existing in order to solve above-mentioned background technology, provides a kind of hybrid vehicle throttled-wide method of controlling exhaust gas.
The technical solution used in the present invention is: the throttled-wide method of controlling exhaust gas of a kind of hybrid vehicle, comprises the following steps:
(1), an exhaust bypass branch road being communicated with exhaust main main line is set on the catalyst converter of engine air throttle, on described exhaust bypass branch road, control valve is set;
(2), after motor oil-break WOT certain hour, open exhaust bypass branch road, fresh air part is flow through and the incomplete exhaust main main line through catalyzer is housed from exhaust bypass branch road;
(3), at motor oil-break closure, exit full-gear rear engine and start power when output and close logical exhaust bypass branch road, avoid tail gas through catalyzer, just by logical exhaust bypass branch road, not discharge.
Further, in described step (1), the branch road pipe diameter size of exhaust bypass branch road is the 1/2-3/4 of exhaust main main line caliber.
Further, motor oil-break WOT and exhaust bypass branch road interval time between opening is 0.3-1s in described step (2).
The a large amount of fresh airs that flow into after controlling method of the present invention can give full throttle are not exclusively through being equipped with the trunk roads of catalyzer, thereby guarantee there will not be the problem that causes catalytic conversion efficiency to reduce because of large quantity of air reduction catalyst temperature, simultaneously because not having a large amount of fresh airs to flow into trunk roads, only the hot environment of catalyzer cannot produce more NOx, effectively reduces the discharge amount of NOx.The method is simply effective, when not reducing catalyst converter transformation efficiency, can reduce the pollution to environment.
Accompanying drawing explanation
Fig. 1 is that in NEDC cyclic process of the present invention, catalyst temperature changes schematic diagram.
Fig. 2 is the exhaust control schematic diagram under closure normal working of the present invention.
Fig. 3 is the exhaust control schematic diagram under WOT state of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, be convenient to be well understood to the present invention, but they do not form restriction to the present invention.
Ternary catalyzing unit is mounted in most important outer purifier in automobile exhaust system, the harmful gases such as CO, the HC that it can be discharged vehicle exhaust and NOx change harmless carbon dioxide, water and nitrogen into by oxidation and reduction, and vehicle exhaust is purified.Three-way catalyst is minimum will react in 350 ℃, and when temperature is too low, conversion efficiency sharply declines; And the active temperature of catalyzer (best operating temperature) is 400 ℃ to 800 ℃ left and right, the too high catalyst ageing that also can make aggravates.As shown in Figure 1, with temperature in ternary catalyzing unit after WOT technology apparently higher than the temperature with WOT technology not, now can cause a large amount of fresh airs to enter into ternary catalyzing unit, cause a high-temperature oxygen-enriched reaction region, impel nitrogen to change in a large number oxynitrides, caused the generation of NOx.
As shown in Figure 2 and Figure 3, solve a large amount of fresh airs after WOT and enter that catalytic conversion efficiency that catalyst converter causes catalyst converter reduces and NOx discharges the problem increasing, the method step of the present invention's employing is:
(1), an exhaust bypass branch road being communicated with exhaust main main line is set on the catalyst converter of engine air throttle, on exhaust bypass branch road, control valve is set, closing and opening and realize the closing with open-minded of exhaust bypass branch road by control valve.The object that the fresh air that the pipe diameter size of exhaust bypass branch road enters in the time of need to meeting as far as possible by motor oil-break WOT is discharged from branch road, therefore the size of branch road caliber depends on size, trend and the layout of main road caliber, and in the present embodiment, the branch road pipe diameter size of exhaust bypass branch road is the 1/2-3/4 of exhaust main main line caliber.
(2), above-mentioned exhaust bypass branch road is only just open-minded after motor oil-break WOT certain retard time, so not only can make fresh air part flow through and the incomplete exhaust main main line through catalyzer is housed from exhaust bypass branch road, and what can guarantee to flow through exhaust bypass branch road is fresh air rather than burning produces in motor tail gas.Fresh air part flows through from exhaust bypass branch road, can weaken to a certain extent the cooling effect of fresh air to catalyst converter, because do not had a large amount of fresh airs to flow into exhaust main main line, only hot environment is to produce more NOx simultaneously, reduces the pollution to environment.
When motor oil-break WOT and exhaust bypass branch road must guarantee that motor is switched to oil-break WOT from working state the interval time between opening, the tail gas of remnants all transforms and drains from three-way catalyst, it is the velocity of discharge that depends on tail gas interval time, guarantee tail gas walk completely exhaust main main line discharge prerequisite under get as far as possible little, the present embodiment adopt retard time be 0.3-1s.
(3), at motor oil-break closure, exit full-gear rear engine and start power when output and close logical exhaust bypass branch road, avoid tail gas through catalyzer, just by logical exhaust bypass branch road, not discharge.
The content not being described in detail in this specification belongs to the known prior art of professional and technical personnel in the field.
Claims (3)
1. the throttled-wide method of controlling exhaust gas of hybrid vehicle, is characterized in that, comprises the following steps:
(1), an exhaust bypass branch road being communicated with exhaust main main line is set on the catalyst converter of engine air throttle, on described exhaust bypass branch road, control valve is set;
(2), after motor oil-break WOT certain hour, open exhaust bypass branch road, fresh air part is flow through and the incomplete exhaust main main line through catalyzer is housed from exhaust bypass branch road;
(3), at motor oil-break closure, exit full-gear rear engine and start power when output and close logical exhaust bypass branch road, avoid tail gas through catalyzer, just by logical exhaust bypass branch road, not discharge.
2. the throttled-wide method of controlling exhaust gas of a kind of hybrid vehicle according to claim 1, is characterized in that: in described step (1), the branch road pipe diameter size of exhaust bypass branch road is the 1/2-3/4 of exhaust main main line caliber.
3. the throttled-wide method of controlling exhaust gas of a kind of hybrid vehicle according to claim 1, is characterized in that: motor oil-break WOT and exhaust bypass branch road interval time between opening is 0.3-1s in described step (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410013412.9A CN103726934B (en) | 2014-01-13 | 2014-01-13 | A kind of throttled-wide method of controlling exhaust gas of hybrid vehicle |
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| CN201410013412.9A CN103726934B (en) | 2014-01-13 | 2014-01-13 | A kind of throttled-wide method of controlling exhaust gas of hybrid vehicle |
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| CN103726934A true CN103726934A (en) | 2014-04-16 |
| CN103726934B CN103726934B (en) | 2016-07-06 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593600A (en) * | 2016-12-26 | 2017-04-26 | 潍柴动力股份有限公司 | Exhaust postprocessing device and method used for engine |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3972727B2 (en) * | 2002-05-16 | 2007-09-05 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP4793103B2 (en) * | 2006-06-01 | 2011-10-12 | 日産自動車株式会社 | Internal combustion engine |
| CN102251835A (en) * | 2009-09-29 | 2011-11-23 | 福特环球技术公司 | Particulate filter regeneration during engine shutdown |
| WO2013079117A1 (en) * | 2011-12-01 | 2013-06-06 | Umicore Ag & Co. Kg | Method for operating exhaust gas purification systems |
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2014
- 2014-01-13 CN CN201410013412.9A patent/CN103726934B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3972727B2 (en) * | 2002-05-16 | 2007-09-05 | トヨタ自動車株式会社 | Exhaust gas purification device for internal combustion engine |
| JP4793103B2 (en) * | 2006-06-01 | 2011-10-12 | 日産自動車株式会社 | Internal combustion engine |
| CN102251835A (en) * | 2009-09-29 | 2011-11-23 | 福特环球技术公司 | Particulate filter regeneration during engine shutdown |
| WO2013079117A1 (en) * | 2011-12-01 | 2013-06-06 | Umicore Ag & Co. Kg | Method for operating exhaust gas purification systems |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106593600A (en) * | 2016-12-26 | 2017-04-26 | 潍柴动力股份有限公司 | Exhaust postprocessing device and method used for engine |
| CN111425286A (en) * | 2020-03-31 | 2020-07-17 | 广西玉柴机器股份有限公司 | Method and system for controlling tail gas emission of gas engine |
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| CN103726934B (en) | 2016-07-06 |
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