CN101509431A - Control method for burning ethanol with water on compression ignition engine and apparatus thereof - Google Patents
Control method for burning ethanol with water on compression ignition engine and apparatus thereof Download PDFInfo
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- CN101509431A CN101509431A CNA2009100681647A CN200910068164A CN101509431A CN 101509431 A CN101509431 A CN 101509431A CN A2009100681647 A CNA2009100681647 A CN A2009100681647A CN 200910068164 A CN200910068164 A CN 200910068164A CN 101509431 A CN101509431 A CN 101509431A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention discloses a control method of burning watered ethanol for a compression ignition engine and a device thereof. The method comprises the following steps: (1) starting the engine; (2) sequentially detecting whether the temperature of cooling water in the exhaust pipe of an engine is not lower than the set temperature, detecting whether the exhaust temperature of the engine is not lower than the set temperature, detecting whether the rotating speed is not less than the set rotating speed and detecting whether the output value of a throttle position sensor is not less than the set value; if not, the engine works depending on fuel; (3) if the result in step (2) is yes, an electronic control unit sends open signals to a solenoid valve controlling the opening and closing of an electric ethanol pump to open the electric ethanol pump, the watered ethanol is provided for an ethanol supply system pipeline and the opening of an ethanol fuel nozzle is controlled at the same time; the engine starts dual-fuel working. The control method can ensure the emission performances of cold start and low load of the engine, reduce the emissions of aldehydes, carbon black and NOx and use ethanol fuel to replace more oil fuel.
Description
Technical field
The present invention relates to combustion method new on the compression ignition engine and device, belong to the method and the device of the combustion method aspect of internal-combustion engine burning ethanol with water (water mixing volume ratio 10%-20%) fuel.
Background technique
Compression ignition engine has thermal efficiency height, specific power is big, long service life, reliable operation, easy to operate, advantage such as cheap, and these advantages are unsurpassable in other power plant short time, thereby compression ignition engine automobile also can not be used other power plant in than short-term automobile replaces.But the use of a large amount of compression ignition engine automobiles has caused two big direct result-air environmental pollutions seriously and the consumption of bulk petroleum fuel.For this reason, press for seek a kind of resource extensively, the novel substitute fuel of compression ignition engine of combustion cleaning.
The ethanol oxygen content up to 35%, latent heat of vaporization value is than gasoline and diesel oil height, oxygen content, gasification latent heat after moisture are higher than straight alcohol, and sulfur-bearing not, are cleaning, reproducible fuel.Water content up to 20% can reduce the dewatering process in the production process, reduces production costs.Global alcohol fuel almost is that China is also like this with straight alcohol (purity is more than 99%) all.Use the shortcoming of straight alcohol: need in (1) production process to purify, cause the cost of production height; (2) need sealing to prevent that suction from causing the user cost height in the storage transportation process.Simultaneously, present stage alcohol fuel utilization mainly be mix to constitute ethanol petrol with gasoline in varing proportions.The ethanol petrol of China constitutes based on E10 (10% ethanol volume ratio).The advantage of this method is that internal-combustion engine does not need change just can use part alcohol fuel substantially.But its shortcoming is also very obvious: (1) petrolic thermal efficiency is not high, causes the capacity usage ratio of ethanol limited; (2) mixing proportion of alcohol fuel is very little, otherwise the easy layering of fuel combination in order to improve mixing proportion, needs to add materials such as surface active agent, cosolvent, increases fuel cost; When (3) using on diesel engine, also need to add the cetane number boost agent, these additives mostly are nitro compound, can increase the NOx discharging when using; (4) latent heat of vaporization height of ethanol, fuel is difficult to catch fire at low temperatures, the engine cold starting difficulty; (5) during little load operation, because temperature and delivery temperature are all very low in the cylinder, thereby unburned carbon hydrogen and aldehydes discharging are serious; (6) from the current fuel structure of China, in short supply on the market is diesel oil but not gasoline.Therefore how the alternative diesel oil with the alcohol fuel high-efficiency cleaning is the subject matter that need solve present stage.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 the internal-combustion engine combusting ethanol fuel is very important.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of emission performance that can guarantee engine cold starting and low-load is provided, aldehydes, soot and NOx discharging can be reduced, the controlling method and the device thereof of more oil-fired a kind of burning ethanol with water on compression ignition engine can be substituted with alcohol fuel.
The controlling method of a kind of burning ethanol with water on compression ignition engine of the present invention, it may further comprise the steps:
(1) ato unit, warming up;
(2) whether detection of engine outlet pipe cooling water temperature is not less than the temperature of setting, is not if detect, and then motor is by fuel oil work;
(3) if testing result is for being in the step (2), then whether the detection of engine delivery temperature is not less than the temperature of setting, if detect to not, then motor leans on fuel oil work;
(4) if testing result is for being in the step (3), then whether the detection of engine rotating speed is not less than the rotating speed of setting, if detect to not, then motor leans on fuel oil work;
(5) if testing result is for being in the step (4), then whether the output value of detection of engine throttle position switch is not less than the value of setting, if detect to not, then motor leans on fuel oil work;
(6) if testing result is for being in the step (5), then thereby electronic control unit sends start signal to the solenoid valve of controlling electronic ethanol pump switching and opens electronic ethanol pump, to providing pressure for pure system pipeline is the ethanol with water of 0.30-0.35MPa, controlling pure fuel nozzle simultaneously opens, motor carries out double fuel work, the water mixing volume ratio of described ethanol with water is 10-20%, and water quality is distilled water.
A kind of control gear of realizing the burning ethanol with water on compression ignition engine controlling method, it comprises an electronic control unit, it comprises that also the low-pressure shaft needle nozzle that is arranged on the engine intake manifold and its link to each other with described electronic control unit by control signal line, be placed on electronic ethanol pump in the alcohol fuel case and its by signaling line successively with solenoid valve, described electronic control unit links to each other, speed probe is installed on flywheel casing, be coaxially installed with throttle position switch with accelerator rod, cooling-water temperature sensor is installed on engine water outlet, described electronic control unit is used to gather described each signal of sensor and relatively judges with the value of setting respectively, solenoid valve to described electronic pure pump sends actuating signal then, the while electronic control unit carries out interpolation according to sensor signal to the arteries and veins stave that is stored in electronic control unit inside and obtains control pulsewidth suitable under the different operating modes, thus and pure the measuring of spray of sending the suitable different operating modes of pulse-width control signal acquisition to pure fuel nozzle.
The invention has the advantages that: the production process of (1) hydrous ethanol is removed dewatering process and has been reduced the alcohol fuel cost; (2) there is not the problem of fuel layering, can improves the substitution rate of alcohol fuel, the highlyest can arrive 60% (quality), reduce motor oil-fired dependence to petroleum products; (3) do not influence the cold-start performance of motor; (4) effectively avoid the discharging of low-load unburned carbon hydrogen and aldehydes, be higher than 300 ℃ because spray row's temperature of pure rear engine, far above the initiation temperature of oxidation catalytic converter, and the point of ignition of formaldehyde is 300 ℃; (4) because the latent heat of vaporization of hydrous ethanol is very big, when suction tude sprays into hydrous ethanol, can effectively reduce Engine Inlet Temperature, and then reduce maximum combustion temperature, suppress the generation of NOx; (5) owing to the oxygen content height of hydrous ethanol, velocity of combustion is fast, when on diesel engine, using, and the carbon smoke exhaust of high load in can also effectively reducing; (6) because the existence of water, maximum combustion temperature in the combustion process and average combustion temperature can decline to a great extent, and, thereby can when effectively reducing the NOx discharging, reduce carbon smoke exhaust because a large amount of OH free radicalss of the existence of water gas reaction and water decomposition can effectively be removed the acetylene that forms carbon nuclear; (7) because pure fuel sulfur-bearing not, can reduce the amount of fossil fuel behind the pure fuel of engine for combusting part, be equivalent to reduce the sulphur content in the motor fuel, help prolonging the working life of motor catalyst.
Description of drawings
Accompanying drawing is the control flow chart of the burning ethanol with water method on a kind of compression ignition engine of the present invention.
Embodiment
Describe the present invention below in conjunction with the drawings and specific embodiments.
The working principle of the inventive method is to take single fuel or double fuel work according to factors such as engine throttle position, rotating speed, coolant water temperature, delivery temperature decision motor, during double fuel work, requirement according to engine performance sprays into an amount of ethanol with water fuel, moisture volume ratio is 10%-20% in the described ethanol with water fuel, and water quality is distilled water.
As shown in drawings, the method for the burning ethanol with water on a kind of compression ignition engine of the present invention, it may further comprise the steps: (1) ato unit, warming up; (2) whether detection of engine outlet pipe cooling water temperature is not less than the temperature of setting, is not if detect, and then motor is by fuel oil work; (3) if testing result is for being in the step (2), then whether the detection of engine delivery temperature is not less than the temperature of setting, if detect to not, then motor leans on fuel oil work; (4) if testing result is for being in the step (3), then whether the detection of engine rotating speed is not less than the rotating speed of setting, if detect to not, then motor leans on fuel oil work; (5) if testing result is for being in the step (4), then whether the output value of detection of engine throttle position switch is not less than the value of setting, if detect to not, then motor leans on fuel oil work; (6) if testing result is for being in the step (5), then thereby electronic control unit sends start signal to the solenoid valve of controlling electronic ethanol pump switching and opens electronic ethanol pump, to providing pressure for pure system pipeline is the ethanol with water of 0.30-0.35-MPa, controlling pure fuel nozzle simultaneously opens, motor carries out double fuel work, the water mixing volume ratio of described ethanol with water is 10-20%, and water quality is distilled water.Described ECU (Electrical Control Unit) can be single-chip microcomputer or computer.
Generally can carry out following setting according to the inventive method to setting value:
1) when Engine torque more than or equal to 30% Maximum Torque, rotating speed is higher than and equals 40% rated engine speed, cooling water temperature is more than or equal to 70 ℃, delivery temperature is during more than or equal to 300 ℃, pass through electronic control unit, open electronic ethanol pump and the ethanol with water of 0.35MPa pressure is provided to the ethanol pipeline, simultaneously (the arteries and veins stave of indication is the curve of a two dimension to electronic control unit here to the arteries and veins stave that is stored in electronic control unit inside according to sensor signal, this two-dimensional curve table records by engine rig test, thereby according to engine speed and the throttle position value is demarcated and obtain the pulse-width controlled value according to the gentle cooling water temperature correction of oil.) carry out interpolation and obtain control pulsewidth suitable under the different operating modes, thereby and send the spray alcohol amount that pulse-width control signal obtains to be fit to different operating modes to pure fuel nozzle, motor carries out double fuel work.
2) when Engine torque less than 30% Maximum Torque or rotating speed is lower than 40% rated engine speed or cooling water temperature is lower than 70 ℃, or delivery temperature is during less than 300 ℃, electronic control unit is closed electronic ethanol pump, also stop to send pulse-width control signal to nozzle, motor only depends on fuel oil work, to guarantee the cold-start performance that motor is good and the emissions quality of little load.
A kind of control gear of realizing the inventive method, it comprises an electronic control unit, it comprises that also the low-pressure shaft needle nozzle that is arranged on the engine intake manifold and its link to each other with described electronic control unit by control signal line, be placed on electronic ethanol pump in the alcohol fuel case and its by signaling line successively with solenoid valve, described electronic control unit links to each other, speed probe is installed on flywheel casing, be coaxially installed with throttle position switch with accelerator rod, cooling-water temperature sensor is installed on engine water outlet, described electronic control unit is used to gather described each signal of sensor and relatively judges with the value of setting respectively, solenoid valve to described electronic pure pump sends actuating signal then, the while electronic control unit carries out interpolation according to sensor signal to the arteries and veins stave that is stored in electronic control unit inside and obtains control pulsewidth suitable under the different operating modes, thus and pure the measuring of spray of sending the suitable different operating modes of pulse-width control signal acquisition to pure fuel nozzle.
The present invention at first is a characteristic of utilizing the rich oxygen content and the high gasification latent heat of hydrous ethanol, according to the needs of engine performance, the working state of motor is divided into two stages.When the starting of motor, warming up and little load operation, supply with fuel oil work by original oil supply system, to protect the motor favorable starting performance, avoid the aldehydes discharging.And when middle high load, spraying into the partially aqueous alcohol fuel by the pure nozzle that is installed on the suction tude, delivery temperature height is at this moment effectively controlled the aldehydes discharging.Because ethanol and hydrate thereof are the fuel that contains oxygen, the high latent heat of vaporization,, reduce the chance that fuel-pyrolysis and NOx generate simultaneously because its high latent heat of vaporization will reduce mixture temperature in the cylinder significantly.Because they contain oxygen, volatile simultaneously, the homogeneous charge of formation can not generate soot when burning.Ethanol can from and biological products, resource is very abundant, also is one of oil-fired best alternative.Adopt combined burning theory burning ethanol with water fuel on motor not only can reduce noxious emission, can also improve engine thermal efficiency, improve fuel availability, meet the energy requirement of national long term growth plan.
Lift a specific embodiment below, technological scheme of the present invention is described.
Embodiment 1
Apart from cylinder head 100mm place 6 low-pressure shaft needle nozzles are installed on the intake manifold of 6J230-20 (DI) type high-speed diesel engine, are placed an electric fuel punp in the alcohol fuel case, fueling pressure is 0.35MPa.Speed probe is installed on flywheel casing,, cooling-water temperature sensor is installed on the engine water outlet with the coaxial installation throttle position switch of accelerator rod.ECU (Electrical Control Unit) mainly is made up of the freescaleMC9S12DP256 single-chip microcomputer, can gather engine speed, throttle position, temperature signal, and judges engine working conditions thus, sends the actuating signal of nozzle.Promptly when diesel engine speed surpasses 1000r/min, moment of torsion surpasses 200N.m, delivery temperature above 300 ℃, and when cooling water temperature surpasses 70 ℃, MC9S12 sends high level signal, nozzle open to the moisture volume ratio of engine spray be 10%, water quality is the aqueous alcohol fuel of distilled water, the emitted dose of described fuel was decided by the endurance of high level.
Detect through national car mass supervision and inspection center (Xiangfan): adopt cold diesel engine in 6J230-20 (DI) the type high-speed boosting of this burning new method and control gear thereof, under the situation of the pump line mouth fuel injection system that still adopts former machine, can make engine emission rise to state III emission standard from state's II emission standard, except that the particulate index satisfies state III requirement, all the other indexs are lower than state IV requirement, and fuel economy remains unchanged substantially.When diesel engine speed was 2300r/min, motor was a fuel when carrying out combined burning with aqueous alcohol/diesel oil, and the maximum substitution rate of diesel oil can reach 42% (mass percent).
Embodiment 2
Apart from cylinder head 100mm place 6 low-pressure shaft needle nozzles are installed on the intake manifold of 6J230-20 (DI) type high-speed diesel engine, are placed an electric fuel punp in the alcohol fuel case, fueling pressure is 0.32MPa.Speed probe is installed on flywheel casing,, cooling-water temperature sensor is installed on the engine water outlet with the coaxial installation throttle position switch of accelerator rod.ECU (Electrical Control Unit) mainly is made up of the freescaleMC9S12DP256 single-chip microcomputer, can gather engine speed, throttle position, temperature signal, and judges engine working conditions thus, sends the actuating signal of nozzle.Promptly working as diesel engine speed is that 1000r/min, moment of torsion are that 200N.m, delivery temperature are 300 ℃, and when cooling water temperature is 70 ℃, MC9S12 sends high level signal, nozzle is opened to the aqueous alcohol water-in-fuel alcohol fuel that the moisture volume ratio of engine spray is 20%, water quality is distilled water, and the emitted dose of fuel was decided by the endurance of high level.
Detect through national car mass supervision and inspection center (Xiangfan): adopt cold diesel engine in 6J230-20 (DI) the type high-speed boosting of this burning new method and control gear thereof, under the situation of the pump line mouth fuel injection system that still adopts former machine, can make engine emission rise to state III emission standard from state's II emission standard, except that the particulate index satisfies state III requirement, all the other indexs are lower than state IV requirement, and fuel economy remains unchanged substantially.When diesel engine speed was 2300r/min, motor was a fuel when carrying out combined burning with aqueous alcohol/diesel oil, and the maximum substitution rate of diesel oil can reach 42% (mass percent).
Embodiment 3
Apart from cylinder head 100mm place 6 low-pressure shaft needle nozzles are installed on the intake manifold of 6J230-20 (DI) type high-speed diesel engine, are placed an electric fuel punp in the alcohol fuel case, fueling pressure is 0.30MPa.Speed probe is installed on flywheel casing,, cooling-water temperature sensor is installed on the engine water outlet with the coaxial installation throttle position switch of accelerator rod.ECU (Electrical Control Unit) mainly is made up of the freescaleMC9S12DP256 single-chip microcomputer, can gather engine speed, throttle position, temperature signal, and judges engine working conditions thus, sends the actuating signal of nozzle.Promptly when diesel engine speed surpasses 1000r/min, moment of torsion surpasses 200N.m, delivery temperature above 300 ℃, and when cooling water temperature surpasses 70 ℃, MC9S12 sends high level signal, nozzle open to the moisture volume ratio of engine spray be 15%, water quality is the aqueous alcohol fuel of distilled water, the emitted dose of described fuel was decided by the endurance of high level.
Detect through national car mass supervision and inspection center (Xiangfan): adopt cold diesel engine in 6J230-20 (DI) the type high-speed boosting of this burning new method and control gear thereof, under the situation of the pump line mouth fuel injection system that still adopts former machine, can make engine emission rise to state III emission standard from state's II emission standard, except that the particulate index satisfies state III requirement, all the other indexs are lower than state IV requirement, and fuel economy remains unchanged substantially.When diesel engine speed was 2300r/min, motor was a fuel when carrying out combined burning with aqueous alcohol/diesel oil, and the maximum substitution rate of diesel oil can reach 42% (mass percent).
Claims (2)
1. the controlling method of a burning ethanol with water on compression ignition engine is characterized in that it may further comprise the steps:
(1) ato unit, warming up;
(2) whether detection of engine outlet pipe cooling water temperature is not less than the temperature of setting, is not if detect, and then motor is by fuel oil work;
(3) if testing result is for being in the step (2), then whether the detection of engine delivery temperature is not less than the temperature of setting, if detect to not, then motor leans on fuel oil work;
(4) if testing result is for being in the step (3), then whether the detection of engine rotating speed is not less than the rotating speed of setting, if detect to not, then motor leans on fuel oil work;
(5) if testing result is for being in the step (4), then whether the output value of detection of engine throttle position switch is not less than the value of setting, if detect to not, then motor leans on fuel oil work;
(6) if testing result is for being in the step (5), then thereby electronic control unit sends start signal to the solenoid valve of controlling electronic ethanol pump switching and opens electronic ethanol pump, to providing pressure for pure system pipeline is the ethanol with water of 0.30-0.35-MPa, controlling pure fuel nozzle simultaneously opens, motor carries out double fuel work, the water mixing volume ratio of described ethanol with water is 10-20%, and water quality is distilled water.
2. control gear of realizing the burning ethanol with water on compression ignition engine controlling method, it comprises an electronic control unit, it is characterized in that: it comprises that also the low-pressure shaft needle nozzle that is arranged on the engine intake manifold and its link to each other with described electronic control unit by control signal line, be placed on electronic ethanol pump in the alcohol fuel case and its by signaling line successively with solenoid valve, described electronic control unit links to each other, speed probe is installed on flywheel casing, be coaxially installed with throttle position switch with accelerator rod, cooling-water temperature sensor is installed on engine water outlet, described electronic control unit is used to gather described each signal of sensor and relatively judges with the value of setting respectively, solenoid valve to described electronic pure pump sends actuating signal then, the while electronic control unit carries out interpolation according to sensor signal to the arteries and veins stave that is stored in electronic control unit inside and obtains control pulsewidth suitable under the different operating modes, thus and pure the measuring of spray of sending the suitable different operating modes of pulse-width control signal acquisition to pure fuel nozzle.
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2009100681647A CN101509431A (en) | 2009-03-18 | 2009-03-18 | Control method for burning ethanol with water on compression ignition engine and apparatus thereof |
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| CNA2009100681647A CN101509431A (en) | 2009-03-18 | 2009-03-18 | Control method for burning ethanol with water on compression ignition engine and apparatus thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153891A (en) * | 2014-07-30 | 2014-11-19 | 长城汽车股份有限公司 | Diesel-petro engine start control system and method |
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2009
- 2009-03-18 CN CNA2009100681647A patent/CN101509431A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153891A (en) * | 2014-07-30 | 2014-11-19 | 长城汽车股份有限公司 | Diesel-petro engine start control system and method |
| CN104153891B (en) * | 2014-07-30 | 2017-02-15 | 长城汽车股份有限公司 | Diesel-petro engine start control system and method |
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Application publication date: 20090819 |