CN1278034C - Diesel engine intake alcohol injection apparatus and injection control method - Google Patents
Diesel engine intake alcohol injection apparatus and injection control method Download PDFInfo
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- CN1278034C CN1278034C CN 03148288 CN03148288A CN1278034C CN 1278034 C CN1278034 C CN 1278034C CN 03148288 CN03148288 CN 03148288 CN 03148288 A CN03148288 A CN 03148288A CN 1278034 C CN1278034 C CN 1278034C
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Abstract
The present invention discloses an intake alcohol injection apparatus for a diesel engine and an injection control method, which belongs to the diesel/alcohol fuel mixing burning technology of the diesel engine. The apparatus is mainly composed of a nozzle in an air intake pipe of an engine or nozzles in an air inlet passage of each cylinder, an electronic control unit driving the nozzles and sensors for engine loading, rotating speed, the position of a cam shaft and the temperature of cooling water, wherein the sensors transmit messages to the electronic control unit. In the injection control method, the apparatus injects quantitative alcohol fuel in time for the engine according to an engine torque, the rotating speed, the temperature of the cooling water and the position of the cam shaft. The present invention has the advantages that a part of alcohol fuel replaces diesel fuel under a high loading condition (high emission of fine particles and NOx) in the engine; compared with the emission of soot when pure diesel fuel is burnt, the emission of soot when alcohol fuel is burnt can reduce 40 percent, and in addition, the NOx can reduce above 30 percent. The apparatus of the invention can conveniently refit the existing diesel engine, and the emission performance of the diesel engine can be greatly improved under the premise of no influence on the power performance thereof.
Description
Technical field
The present invention relates to a kind of controlling method of diesel engine intake spray alcohol, belong to the diesel oil/pure fuel mix combustion technology of diesel engine.
Background technique
Diesel engine is not only widely applied in lorry, city bus, even is also more and more widely used in car because of its good and economic and reliability.But, because diesel combustion essence determines that particulate and nitrogen oxide (NOx) emission compliance problem is still the key of its development of restriction.Present solution in the world reduces NOx simultaneously to be had with the basic way of this a pair of contradiction of particle emission: (one) adopts high-pressure injection to combine multiple new and high technologies such as exhaust after-treatment on diesel engine.This way technical difficulty is big, and domestic being difficult at present realizes.(2) the high-quality diesel oil of the ultralow sulphur content of employing, but the diesel quality of domestic supply at present is difficult to up to standard.(3) in diesel oil, be equipped with the fuel realization mixed combustion that methyl alcohol or ethanol contain oxygen, the high latent heat of vaporization, to reduce NOx and particle emission.What the employing at present of this way was more is that the formation fuel combination burnt after diesel oil was mixed pure emulsification, and its deficiency is that fuel combination stores easy layering; Because the raising of the fuel combination latent heat of vaporization, fuel is difficult to catch fire at low temperatures, the engine cold starting difficulty; In addition, the HC of combustion discharging is not serious under little load condition.In view of the foregoing, substitute the part oil for realization utilizes reproducible energy alcohol, and accomplish the zero-emission of smokeless combustion as far as possible, the combustion technology of improving diesel oil/pure fuel combination is very important.
Summary of the invention
The object of the present invention is to provide a kind of controlling method of diesel engine intake spray alcohol, be implemented in the diesel engine intake according to injection apparatus and spray pure fuel and form the partly-premixed gas that closes, enter behind the cylinder by diesel oil ignited (pure fuel ignition point height), and carry out mixed combustion with diesel oil, not only can guarantee the original good starting performance of diesel engine, little load emissions quality is constant, and NOx and particle emission can significantly reduce high load in the diesel engine time, and described method operation is reliable.
The present invention is realized by following technical proposals:
Load, rotating speed, port timing and cooling water temperature according to motor are all multifactor, implement regularly, form premixed gas to engine air inlet tube or each cylinder intake port injection alcohol fuel quantitatively, enter cylinder by device diesel oil ignited and that carry out mixed combustion with diesel oil.This device is by being arranged on the nozzle in the engine air inlet tube or being arranged on the nozzle in each cylinder intake duct and driving the ECU (Electrical Control Unit) of nozzle switch and form to the sensor that ECU (Electrical Control Unit) is transmitted engine load, rotating speed, camshaft location and the cooling water temperature of information.
The method that adopts above-mentioned spray alcohol device to realize regularly, quantitatively carry out mixed combustion to engine spray alcohol fuel is characterized in that comprising following specific practice:
1) when spreading out of Engine torque, sensor is higher than when equaling 40% rated engine speed, cooling water temperature more than or equal to 70 ℃ signal more than or equal to 60% Maximum Torque, rotating speed, pass through ECU (Electrical Control Unit), starting nozzle is to engine spray alcohol fuel, and diesel engine carries out diesel oil/pure fuel mix burning.The alcohol emitted dose accounts for 0～35% (by fuel value) of pure diesel oil; When realizing multi-point injection, under above-mentioned engine operating condition condition, when spreading out of each cylinder intake valve start signal according to the engine cam shaft position sensor, nozzle begins to each cylinder intake port injection alcohol fuel, and pure emitted dose accounts for 0～35% (by fuel value) of pure diesel oil.
2) when sensor spreads out of Engine torque and is lower than 409% rated engine speed or cooling water temperature and is lower than 70 ℃ signal less than 60% Maximum Torque or rotating speed, ECU (Electrical Control Unit) is not sent actuating signal to nozzle, motor only depends on diesel oil work, to guarantee the cold-start performance that diesel engine is good and the emissions quality of little load.
The invention has the advantages that,, replace diesel oil with the pure fuel of part in middle high load (particulate and NOx discharging are all very high) operating mode.After adopting air inlet spray alcohol, the carbon smoke exhaust of diesel engine can reduce by 40% during than pure diesel combustion, and NOx can reduce more than 30%.
Adopt the diesel engine of device of the present invention to existing type, can reequip easily, under the prerequisite that does not influence its power performance, its emissions quality is greatly improved, after the diesel engine that can not satisfy Europe II emission standard installs this device additional, can be easy to realize that emission performance reaches Europe II emission standard.Reach the type of Europe II emission standard, installed this device additional and increase suitable exhaust after treatment system, also can be easier to reach Europe III emission standard; To type newly developed, can carry out the combined optimization design with fuel system for diesel engine, can reduce requirement to former high-pressure fuel pump of diesel engine, reach the double action that reduces cost and improve emissions quality.
Description of drawings
Fig. 1 is located at the structural representation of the present invention of single-point discharge in the suction tude for nozzle.
Fig. 2 is located at the structural representation of the present invention of multi-point injection in the intake duct for nozzle.
1 is air-strainer among the figure, and 2 is nozzle, and 3 is suction tude, 4 is diesel engine, and 5 is ECU (Electrical Control Unit), and 6 is engine load sensor, 7 is engine rotation speed sensor, 8 is cooling-water temperature sensor, and 9 is CMPS Camshaft Position Sensor, and 10 is intake manifold, 11 is pure fuel rail, 12 is pure fuel pressure regulator, and 13 is electric fuel punp, and 14 is pure fuel tank.
Embodiment
Diesel engine is not only widely applied in lorry, city bus, even is also more and more widely used in car because of its good and economic and reliability.But because diesel combustion essence institute determine, the measure that reduces NOx and particle emission is mutual contradiction often, so NOx and particle emission problem up to standard are the keys that restricts diesel engine development.According to the demand for development of country, China's diesel emission will be in line with international standards rapidly, and the NOx and the particle emission that reduce diesel engine are very urgent.
The present invention reaches the purpose that reduces NOx and particulate simultaneously by the method that pure fuel is sprayed in air inlet.Methyl alcohol and ethanol are the fuel that contains oxygen, the high latent heat of vaporization, because its high latent heat of vaporization will reduce mixture temperature in the cylinder significantly, reduce the chance that fuel-pyrolysis and NOx generate.Because they contain oxygen, volatile simultaneously, the homogeneous charge of formation can not generate soot when burning.Aalcohols fuel is from coal and biological products, and resource is very abundant, also is one of oil-fired best alternative.Alcohol fuel and diesel oil mixed combustion will not only can reduce harmful emission of diesel engine, can also improve engine thermal efficiency, improve fuel availability, meet the energy requirement of national long term growth plan.
In engine charge, spray pure fuel and form the partly-premixed gas that closes, premixed gas enters behind the cylinder by diesel oil ignited, and carry out mixed combustion with diesel oil, NOx and particle emission in the time of effectively reducing high load in the motor, but the best emitted dose of alcohol is also different under the different load operating mode, also is the ratio difference of diesel oil/alcohol, and motor is worked under best injection proportion, can reduce the discharging of NOx and particulate significantly, and not influence the discharging of CO and HC substantially.Diesel engine intake spray alcohol of the present invention and ejection control method, can wait according to engine load, rotating speed, cooling water temperature and adjust emitted dose in the diesel engine intake automatically, diesel engine does not influence the emission performance of its favorable starting performance and little load only with pure diesel oil work when being implemented in starting, warming up and little load; When middle high load, spray best alcohol amount in real time according to the operating mode of motor, reach the discharging that does not increase HC and CO when reducing NOx and particle emission to the full extent.
Embodiment:
1. the intake manifold at 485Q-1 (DI) diesel engine goes up apart from low-pressure shaft needle nozzle of cylinder head 300mm place installation, places an electric fuel punp in pure fuel tank, and fueling pressure is 300～350kPa.Speed probe is installed on flywheel casing, and engine power output terminal mounting torque sensor is installed cooling-water temperature sensor on the engine water outlet.ECU (Electrical Control Unit) mainly is made up of the MS-51 single-chip microcomputer, can gather engine speed, moment of torsion, temperature signal, and judges engine working conditions thus, sends the actuating signal of nozzle.Promptly when diesel engine speed surpassed 1200r/min, moment of torsion and surpasses 70N.m and cooling water temperature and surpass 70 ℃, MS-51 sent high level signal, and nozzle is opened to engine spray alcohol fuel, and the emitted dose of fuel was decided by the endurance of high level.If respectively arrange a nozzle on each cylinder intake duct when adopting multi-point injection, also need on motor, install a CMPS Camshaft Position Sensor additional, to transmit the engines distribution phase signal to single-chip microcomputer, when each cylinder intake valve was opened, nozzle was opened to engine spray alcohol fuel.
2. when diesel engine speed was 2000r/min, motor was 30% (by calorific value) in ethanol/diesel oil, when carrying out double fuel work, reduced by 35% when the smoke intensity when reaching Maximum Torque 120N.m reaches 120N.m than with pure diesel oil work, and NOx reduces by 28%.
Claims (1)
1, a kind of controlling method of diesel engine intake spray alcohol, the device that this method adopts is characterized in that comprising following specific practice by being arranged on the nozzle in the engine air inlet tube or being arranged on the nozzle in each cylinder intake duct and driving the ECU (Electrical Control Unit) of nozzle switch and form to the sensor that ECU (Electrical Control Unit) is transmitted engine load, rotating speed, camshaft location and the cooling water temperature of information:
1) when sensor spread out of Engine torque more than or equal to 60% Maximum Torque, rotating speed more than or equal to 40% rated engine speed, cooling water temperature during more than or equal to 70 ℃ signal, pass through ECU (Electrical Control Unit), starting nozzle is to engine spray alcohol fuel, diesel engine carries out diesel oil-pure fuel mix burning, accounts for 0～35% of pure diesel oil by the pure emitted dose of fuel value; When realizing multi-point injection, under above-mentioned engine operating condition condition, when spreading out of each cylinder intake valve start signal according to the engine cam shaft position sensor, nozzle begins to account for 0～35% of pure diesel oil to each cylinder intake port injection alcohol fuel by the pure emitted dose of fuel value;
2) when sensor spread out of Engine torque and is lower than 70 ℃ signal less than 60% Maximum Torque or rotating speed less than 40% rated engine speed or cooling water temperature, ECU (Electrical Control Unit) was not sent actuating signal to nozzle, and motor only depends on diesel oil work.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03148288 CN1278034C (en) | 2003-07-03 | 2003-07-03 | Diesel engine intake alcohol injection apparatus and injection control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03148288 CN1278034C (en) | 2003-07-03 | 2003-07-03 | Diesel engine intake alcohol injection apparatus and injection control method |
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| Publication Number | Publication Date |
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| CN1470752A CN1470752A (en) | 2004-01-28 |
| CN1278034C true CN1278034C (en) | 2006-10-04 |
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| CN 03148288 Expired - Fee Related CN1278034C (en) | 2003-07-03 | 2003-07-03 | Diesel engine intake alcohol injection apparatus and injection control method |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102953887B (en) * | 2012-11-06 | 2014-11-05 | 天津大学 | Penetration distance-composited alcohol spraying method and device |
| CN108533422A (en) * | 2018-01-23 | 2018-09-14 | 中国第汽车股份有限公司 | A kind of Alcohol engines water mixing spraying system and water mixing injection method |
| CN110259575A (en) * | 2019-06-25 | 2019-09-20 | 北京理工大学 | Methanol diesel-oil engine and its scaling method |
| CN113294778B (en) * | 2021-05-31 | 2023-01-31 | 常熟理工学院 | Method for reducing nitrogen oxide emission of thermal flow generator for thermal vibration test |
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- 2003-07-03 CN CN 03148288 patent/CN1278034C/en not_active Expired - Fee Related
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