CN101592090B - Method for reducing emission of diesel engine for light vehicle - Google Patents
Method for reducing emission of diesel engine for light vehicle Download PDFInfo
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- CN101592090B CN101592090B CN2009103043169A CN200910304316A CN101592090B CN 101592090 B CN101592090 B CN 101592090B CN 2009103043169 A CN2009103043169 A CN 2009103043169A CN 200910304316 A CN200910304316 A CN 200910304316A CN 101592090 B CN101592090 B CN 101592090B
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Abstract
The invention discloses a method and a device for reducing the emission of a diesel engine for a light vehicle. The method comprises the following steps that: (1) a control unit respectively reads a rotating speed signal and an engine signal, and judges whether the engine runs in medium-low load or high load or not according to the signals; (2) if the judge result of the step (1) is in the medium-low load, the control unit sends an opening-closing signal to a mechanical supercharging control valve, and simultaneously sends a working signal to an electromagnetic clutch; the electromagnetic clutch is meshed with a crankshaft drive drain so as to drive a mechanical supercharger and a turbo charger to work at the same time, and simultaneously the control unit sends a throttle opening signal to a back pressure valve and a waste gas recirculation valve; and (3) if the judge result of the step (1) is in high load working station, the control unit sends an opening signal to the mechanical supercharging control valve, and the turbo charger independently works; and meanwhile, the control unit sends the throttle opening signal to the back pressure valve and the waste gas recirculation valve. The method can meet the 4/5 emission requirements of the state.
Description
Technical field
The present invention relates to a kind of method and device thereof that reduces emission of diesel engine for light vehicle.
Background technique
The combustion process of diesel engine belongs to the diffusive combustion of spraying.Because fuel spray and Air mixing time are very short, mixed gas is inhomogeneous, has formed high temperature overrich district and hot flame district in combustion process.Atmosphere in high temperature overrich district owing to anoxic has generated more soot; And, then generate a large amount of NOx in the hot flame district that burning forms.The difference of diesel engine carbon black and NOx formation condition makes the measure that reduces a kind of discharging tend to cause increasing of another kind of discharging, be the usually said trade-off relation that has a kind of these those length that disappear, the trade-off relation of improving between soot and the NOx is to reduce the key of diesel emission.
From formation mechanism, soot mainly is created on the denseer certain temperature range of mixed gas, and the concentration of mixed gas is the main factor that influences soot; And that NOx generates during greater than 2200K in temperature is more, reduces combustion temperature and be the effective measures that reduce the NOx discharging.Exhaust gas recirculation has obtained extensive approval to the useful effect that reduces the NOx discharging, but tends to cause the rising of carbon smoke exhaust in concrete enforcement.Exhaust gas recirculation is that it reduces principal element that NOx generates to the reduction effect of combustion temperature with to the diluting effect (oxygen concentration reduction) of air inlet, but exhaust gas recirculation generally makes the fresh air that enters cylinder reduce, cause mixed gas to thicken, velocity of combustion and decrease of temperature have also been slowed down the oxidation of soot simultaneously, thereby cause carbon smoke exhaust to increase.Therefore when adopting the EGR Technology measure, how keeping good carbon smoke exhaust is the problem that emphasis will solve.
The operating mode commonly used of Light-duty Vehicle is a partial load condition, during the emission test operating point mainly is distributed in, running on the lower load (50% about load and following).Motor in, general air fuel ratio is higher during low-load, employing is less relatively than the negative effect that the exhaust gas recirculation of small scale brings smoke intensity, and under the ER EGR Rate condition with higher when higher (to the NOx emission request), the increase air inflow just need take appropriate measures, keep enough air fuel ratios, thereby obtaining to guarantee good carbon smoke exhaust when the NOx discharging effectively reduces.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of reduction light vehicle diesel engine discharging is provided, make it satisfy a kind of method and device thereof that reduces emission of diesel engine for light vehicle of GB 4 and state's 5 stage emission request.
A kind of method that reduces emission of diesel engine for light vehicle of the present invention, it may further comprise the steps:
(1) control unit read respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and according to described tach signal and engine load signal judge motor operate in, the operating mode of low-load or operate in the operating mode of big load;
(2) if the judged result in the step (1) be in, the operating mode of low-load, then described control unit sends shutdown signal to the engine driven supercharging control valve that is installed on the engine charge pipeline, simultaneously send working signal to magnetic clutch, thereby the engagement of described magnetic clutch and bent axle power train drives mechanical supercharger and works simultaneously with turbosupercharger, and described control unit of while sends the aperture signal according to the control arteries and veins spectrogram of demarcating to being installed in the back pressure valve on the engine exhaust pipe and the exhaust gas recirculation valve of exhaust gas recirculation pipeline;
(3) if the judged result in the step (1) is the operating mode of big load, then described control unit sends opening signal to the engine driven supercharging control valve that is installed on the air inlet pipeline, sends cut-off signal to magnetic clutch simultaneously, and turbosupercharger works independently; Simultaneously described control unit sends the aperture signal according to the control arteries and veins spectrogram of demarcating to being installed in the back pressure valve on the engine exhaust pipe and the exhaust gas recirculation valve of exhaust gas recirculation pipeline.
The device of reduction emission of diesel engine for light vehicle of the present invention, it comprises the exhaust-gas turbocharging system that exhaust-gas turbocharger is housed, gas recirculation system, the two-stage oxidation reaction device, it also comprises the engine driven supercharging system, described engine driven supercharging system comprises the engine driven supercharging control valve that is installed on the engine charge pipeline, with the described engine driven supercharging control valve mechanical supercharger that links to each other in parallel, the rotating shaft of described mechanical supercharger links to each other with first belt transmission system, one second belt transmission system links to each other with the bent axle of motor, described first, between the two belt transmission system magnetic clutch is housed, before described two-stage oxidation reaction device is installed in described exhaust-gas turbocharger respectively, after engine exhaust pipe on.
Emission of diesel engine for light vehicle controlling method of the present invention, its system are formed and are mainly comprised combined supercharging system (being made up of conventional turbocharger and mechanical supercharger), automatically controlled gas recirculation system and two-stage oxidation reaction device (DOC) after-treatment device.In Light-duty Vehicle operating mode commonly used, mechanical supercharger participation work, promptly adopt the combined supercharging pattern, can improve boost pressure and air inflow by a relatively large margin, effectively reduce the NOx discharging by control ER EGR Rate, realization low-temperature burning, and the sufficient amount of fresh air that combined supercharging provides also can be controlled at carbon smoke exhaust level preferably, can satisfy state's 4/5 emission request by two-stage DOC.At high load working condition, then being worked independently by conventional turbocharger gets final product.
Description of drawings
Fig. 1 is a kind of method of emission of diesel engine for light vehicle and system schematic of device thereof of reducing of the present invention;
Fig. 2 is control principle figure of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
The device of reduction emission of diesel engine for light vehicle of the present invention as shown in Figure 1, it comprises exhaust-gas turbocharging system, gas recirculation system, described exhaust-gas turbocharging system generally includes air-strainer 10, the exhaust-gas turbocharger 1 that is installed on the engine charge pipeline, has installed engine driven supercharging control valve 7 additional on air intake intercooler 11, the engine charge pipeline of apparatus of the present invention after described air-strainer 10.The engine exhaust of at present common gas recirculation system is divided into two-way, and one the tunnel communicates with atmosphere, on this outlet pipe back pressure valve is housed.Another road is connected with engine air inlet tube, and cooler for recycled exhaust gas 9 and exhaust gas recirculation valve 8 are housed on this exhaust gas recirculation pipeline successively.Apparatus of the present invention also comprise the engine driven supercharging system, described engine driven supercharging system comprises the described engine driven supercharging control valve 7 that is installed on the engine charge pipeline, with described engine driven supercharging control valve 7 mechanical superchargers 3 that link to each other in parallel, the rotating shaft of described mechanical supercharger 3 and first belt transmission are 5 to link to each other, one second belt transmission is 6 to link to each other with the bent axle of motor, between described first and second belt transmission system magnetic clutch 4 is housed.Two-stage oxidation reaction device 12,13 is installed in respectively on the forward and backward engine exhaust pipe of described exhaust-gas turbocharger 1.
Of the present invention a kind of method that reduces emission of diesel engine for light vehicle as shown in Figure 1, 2, it comprises exhaust-gas turbocharger 1, back pressure valve 2, mechanical supercharger 3, magnetic clutch 4, belt drive system 5 and 6, engine driven supercharging control valve 7, exhaust gas recirculation valve 8.In engine operation process, control unit is accepted rotating speed and gas pedal (load of corresponding motor) signal, determines the operating conditions of motor according to above-mentioned signal, judges whether mechanical supercharger works.During if motor operates in, the operating mode commonly used of low-load, magnetic clutch 4 and the engagement of bent axle power train, rotatablely moving of bent axle passed to the axle system of mechanical supercharger by belt drive system 5 and 6, mechanical supercharger is started working, at this moment, engine driven supercharging control valve 7 is closed, air inlet enter after by mechanical supercharger and exhaust-gas turbocharger two-step supercharging motor cylinder, simultaneously, control unit (ECU) is according to rotating speed and load signal, according to control arteries and veins spectrum (MAP) figure that demarcated, the aperture of control exhaust gas recirculation valve 8 and back pressure valve 2, thereby realize the control of waste gas in cycling rate (EGR) rate, the demarcation of control arteries and veins spectrum (MAP) figure satisfies GB 4 with control NOx discharging or state's 5 emission requests are demarcated.Like this, at partial load condition, can guarantee enough air inflows that EGR leads and carbon smoke exhaust control needs that the NOx emission control needs simultaneously.At high load working condition, in order to reduce the mechanical load of motor, magnetic clutch 4 breaks away from the bent axle power train, mechanical supercharger quits work, the engine driven supercharging control valve is opened, the import that mechanical supercharger directly enters turbosupercharger is walked around in air inlet, motor is in the pattern of single stage supercharging, described control unit is composed (MAP) figure to the back pressure valve that is installed on the engine exhaust pipe according to the control arteries and veins of demarcating simultaneously, exhaust gas recirculation valve is sent the aperture signal, because this moment, exhaust energy was relatively more sufficient, also can provide enough boost pressure and air inflows by exhaust-gas turbocharger merely, can guarantee the performance and the discharging of motor equally.Simultaneously, two-stage oxidation reaction device (DOC) after-treatment system can further reduce particulate (soot) discharging, like this, just can realize efficient, the low emissions combustion process of diesel engine for light vehicle.
Adopting the inventive method is that the diesel engine for light vehicle of 2.7L has carried out engine bench test to discharge capacity:
Control unit reads tach signal and accelerator pedal signal respectively, if according to described tach signal and accelerator pedal signal judge motor be operate in, the operating mode of low-load; Described control unit sends shutdown signal to the engine driven supercharging control valve that is installed on the engine charge pipeline, simultaneously send working signal to magnetic clutch, described magnetic clutch and bent axle power train engagement drive mechanical supercharger and turbosupercharger are worked simultaneously, described control unit sends the aperture signal to the back pressure valve, the exhaust gas recirculation valve that are installed on the engine exhaust pipe, the control ER EGR Rate according to control arteries and veins spectrum (MAP) figure that demarcated simultaneously.If motor operates in the high load operating mode, described control unit sends opening signal to the engine driven supercharging control valve that is installed on the engine charge pipeline, simultaneously send silence signal to magnetic clutch, described magnetic clutch and bent axle power train break away from, turbosupercharger works independently, described control unit sends the aperture signal to the back pressure valve, the exhaust gas recirculation valve that are installed on the engine exhaust pipe, the control ER EGR Rate according to control arteries and veins spectrum (MAP) figure that demarcated simultaneously.The result shows that in each emission test operating mode, ER EGR Rate is under the situation of 20%-30%, and exhaust is carried out reprocessing through the two-stage oxidation reaction device, has the ability that satisfies state's 4/5 discharging.
Claims (1)
1. method that reduces emission of diesel engine for light vehicle is characterized in that it may further comprise the steps:
(1) control unit read respectively the tach signal that is installed in the sensor on the engine crankshaft, the engine load signal that is installed in the sensor on the gas pedal and according to described tach signal and engine load signal judge motor operate in, the operating mode of low-load or operate in the operating mode of big load;
(2) if during the judged result in the step (1) is, the operating mode of low-load, then described control unit sends shutdown signal to the engine driven supercharging control valve that is installed on the engine charge pipeline, simultaneously send working signal to magnetic clutch, thereby described magnetic clutch and the engagement of bent axle power train drive mechanical supercharger work, this moment, mechanical supercharger was in the combined supercharging working state of connecting with exhaust-driven turbosupercharger, simultaneously described control unit according to the control arteries and veins spectrogram of demarcating to the back pressure valve that is installed on the engine exhaust pipe, and the exhaust gas recirculation valve of exhaust gas recirculation pipeline sends the aperture signal, and described engine driven supercharging control valve links to each other with mechanical supercharger is in parallel;
(3) if the judged result in the step (1) is the operating mode of big load, then described control unit sends opening signal to the engine driven supercharging control valve that is installed on the air inlet pipeline, sends cut-off signal to magnetic clutch simultaneously, and turbosupercharger works independently; Simultaneously described control unit sends the aperture signal according to the control arteries and veins spectrogram of demarcating to being installed in the back pressure valve on the engine exhaust pipe and the exhaust gas recirculation valve of exhaust gas recirculation pipeline.
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| CN2009103043169A CN101592090B (en) | 2009-07-14 | 2009-07-14 | Method for reducing emission of diesel engine for light vehicle |
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| CN2009103043169A CN101592090B (en) | 2009-07-14 | 2009-07-14 | Method for reducing emission of diesel engine for light vehicle |
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| CN101592090B true CN101592090B (en) | 2011-11-09 |
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102072010B (en) * | 2011-01-27 | 2012-08-22 | 华伟 | Engine pressurization structure |
| CN102155289A (en) * | 2011-04-18 | 2011-08-17 | 杭州申财科技有限公司 | Multistage supercharging device of internal combustion engine |
| JP5994430B2 (en) * | 2012-06-28 | 2016-09-21 | いすゞ自動車株式会社 | Internal combustion engine, vehicle equipped with the same, and control method thereof |
| CN108934399A (en) * | 2015-07-24 | 2018-12-07 | 朱保生 | Grass trimmer |
| CN108412642A (en) * | 2015-07-24 | 2018-08-17 | 朱保生 | Petrol engine with exhaust gas turbocharge auxiliary device and grass trimmer |
| GB201617825D0 (en) * | 2016-10-21 | 2016-12-07 | Ford Global Tech Llc | A boosted engine system of a motor vehicle |
| CN106837613A (en) * | 2017-01-03 | 2017-06-13 | 浙江吉利控股集团有限公司 | A kind of low pressure EGR system of vehicle motor |
| CN110821644A (en) * | 2018-08-07 | 2020-02-21 | 重庆科克发动机技术有限公司 | Scavenging system of two-stroke opposed engine |
| CN110206641B (en) * | 2019-04-29 | 2021-04-02 | 天津大学 | Compression ignition engine and method for realizing low-temperature combustion mode thereof |
| CN111779582A (en) * | 2020-06-23 | 2020-10-16 | 河南柴油机重工有限责任公司 | Control method and system of EGR (exhaust gas Recirculation) system of diesel engine and application of control method and system |
| CN113982745B (en) * | 2021-06-30 | 2022-11-15 | 航天时代飞鸿技术有限公司 | Composite supercharging system suitable for aviation piston supercharged engine and control method |
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