CN203742857U - Fuel oil system capable of accurately controlling oil injection temperature of diesel engine - Google Patents
Fuel oil system capable of accurately controlling oil injection temperature of diesel engine Download PDFInfo
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- CN203742857U CN203742857U CN201320421330.9U CN201320421330U CN203742857U CN 203742857 U CN203742857 U CN 203742857U CN 201320421330 U CN201320421330 U CN 201320421330U CN 203742857 U CN203742857 U CN 203742857U
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Abstract
The utility model belongs to the technical field of internal combustion engines, and particularly relates to a fuel oil system capable of accurately controlling the oil injection temperature of a diesel engine. In the fuel oil system, high-pressure fuel oil is branched into two paths, a fuel oil rail of one of the two paths is heated, and then the two paths of fuel oil are mixed through a convection heat transfer device; the mixing ratio is adjusted through a flow control execution mechanism controlled by a single-chip microcomputer connected with a temperature sensor; not only can fuel oil be heated to a high temperature of hundreds of degrees quickly, but also the fuel oil temperature is adjusted in time during the whole dynamic processes of fuel oil supply and injection, so that the purpose of accurately injecting fuel oil with certain temperature is achieved. The fuel oil system can effectively improve the spraying effect of a high-power diesel engine powered with heavy diesel, and can be used on large diesel engines on a ship and engineering machinery.
Description
Technical field
The utility model belongs to technical field of internal combustion engines, relates to the fuel oil supply system of diesel engine, is a kind of oil-fired system that can accurately control diesel engine fuel injecting temperature specifically.
Background technique
Diesel engine has been widely used in all trades and professions because of its good power character and Economy, yet along with global energy scarcity and human settlement's deterioration, the characteristics such as the high-performance of diesel engine, low energy consumption, low emission have become the topic that people attract attention; The ratio that small passenger car field adopts diesel engine to be used as power is not high, but at engineering machinery and shipbuilding industry, diesel engine especially high-power heavy type diesel engine has very high recoverable amount, the having a high potential of its energy-saving and emission-reduction.For cost-saving, a lot of its main fuels of high-power diesel engine are heavy diesel that viscosity is relatively high, atomization badness under common fuel delivery mode, and burning is severe, discharge higher, so provide a kind of fuel injection mode that reduces Heavy diesel oil viscosity necessary.
Suitably improve fuel oil injection temperature and can make fuel-viscosity variation and surface tension reduce, make atomizing effect better, and then optimize in-cylinder combustion process and emission level, the people such as Su Han Park are at " Macroscopic spray characteristics and breakup performance of dimethyl ether (DME) fuel at high fuel temperatures and ambient conditions " Fuel 89 (2010) 3001-3011, in one literary composition, adopt steam-heated mode on the high-pressure oil pipe between oil pump and oil sprayer, to carry out heat treated, test show dimethyl ether atomizing effect under high temperature condition, obtained raising to a certain degree, the comprehensive result of study about fuel oil temperature more both domestic and external, can think fit and improve a kind of important way that fuel oil injection temperature is reduction high viscosity fuel viscosity.
The patent that relates at present the mode that improves diesel engine fuel jetting temperature has a lot, such as CN 101592101A(automatic temperature control heating device of diesel vehicle fuel system), CN 102720610A (a kind of diesel engine fuel-firing supply system), CN101592101A(automatic temperature control heating device of diesel vehicle fuel system) etc.; By the research to Patents, can roughly its summary be classified as out to following feature: one, the heating equipment described in most of patent is mainly used in improving diesel engine cold start-up problem, limited and uncontrollable its temperature of the temperature of raising; They are two years old, it is to use electric-heating-wire-heating fuel oil and by feedback regulation control heating time that part patent fuel oil sprays temperature controlled common method, although this mode can heat rapidly high temp oil-fired to a certain extent, the real time temperature control accuracy of the high temp oil-fired that flow is inadequate; For overcoming the deficiency of above technology, the utility model provides a kind of new heat exchange placement policies, be about to high pressure fuel and divide two-way, a road fuel oil track is wherein heated, by convection heat exchange device, two-way fuel oil is mixed, mixed proportion regulates by the flow control actuator that is connecting the single-chip microcomputer of temperature transducer and control; The method can realize high temp oil-fired real time temperature regulation and control, and both heated fuel oil, to the high temperature of hundreds of degree Celsius, can regulate fuel oil temperature in time again in the dynamic process of whole fuel delivery and injection rapidly, reached the object of a certain setting temperature fuel oil of accurate injection.
Summary of the invention
Concrete model utility thes contents are as follows:
1. can accurately control an oil-fired system for diesel engine fuel jetting temperature, it is characterized in that: described oil-fired system comprises filter cleaner, oil transfer pump, high pressure oil pump, is total to rail, fuel heater, convection heat exchange device, oil sprayer, high temperature fuel tank, normal temperature fuel tank and cooling fan; Oil transfer pump one end is connected with normal temperature fuel tank, and the other end connects filter cleaner, and fuel oil enters high pressure oil pump after filter cleaner purifies, and high pressure oil pump, for common rail provides high pressure fuel, is total to the unnecessary fuel oil of rail and flows into normal temperature fuel tank by the pressure release oil duct of being controlled by common rail Decompression valves; Rail is exported two oil circuits altogether, and one is high temperature oil circuit, and another is normal temperature oil circuit; High temperature oil circuit is provided with fuel heater, and two oil circuits connect convection heat exchange device, and convection heat exchange device has two delivery outlets, and wherein one is mixed flow heat exchanger delivery outlet, connects oil sprayer; Another delivery outlet is normally open solenoid valve delivery outlet, by normally open solenoid valve, control its switching and access high temperature fuel tank by return tube, oil sprayer is also connected with high temperature fuel tank by return tube, on high temperature fuel tank sidewall, cooling fan be installed and be placed in than higher place, normal temperature fuel tank position, between high temperature fuel tank and normal temperature fuel tank, be provided with oil circuit, by valve, control its switching.
2. convection heat exchange device YouECUHe convection control actuator forms, its effect is that cold and hot two-way fuel oil is mixed and the temperature information of blended fuel oil is reached to ECU, ECU can receive the information of temperature transducer, according to setting program, send signal triggering flow control actuator and carry out flow control, by regulating the mixed proportion of two-way fuel oil to reach the object of controlling blended fuel oil temperature, described flow control actuator is mainly by housing, throttling UNICOM axle, agitator arm, thermometer, normally open solenoid valve, coupling, stepper motor, temperature transducer forms, the oil inlet end of housing has high temperature oil circuit entrance and normal temperature oil circuit entrance, the top and bottom of throttling UNICOM axle are separately fixed at upper wall the inner and lower wall the inner of housing, wherein the entrance intersection of throttling UNICOM axle and high temperature oil circuit and normal temperature oil circuit has two mutually perpendicular two throttle orifices of central axis, by throttling UNICOM axle, rotate the mixed proportion that can control cold and hot two-way fuel oil, throttling UNICOM axle upper end is connected with the stepper motor being fixed on the upper wall outer end of housing by coupling, stepper motor is accepted to control UNICOM's axle rotation angle after ECU signal, throttling UNICOM axle right side is mixed flow heat exchanger, throttling UNICOM axle right-hand member is provided with an agitator arm fully to be mixed for cold and hot two-way fuel oil, housing oil outlet end has mixed flow heat exchanger delivery outlet and communicates with mixed flow heat exchanger, normally open solenoid valve is arranged on the end bottom of mixed flow heat exchanger, by ECU, controlled, its effect is the switching of controlling return tube, return tube becomes loop with high temperature oil box-shaped, thermometer is stretched into mixed flow heat exchanger and is interference fit to fix and to be connected with ECU with housing upper wall by housing pore that upper wall is opened with temperature transducer.
3. the utility model is divided into two-way by high-pressure common rail output oil pipe, wherein a road is normal temperature oil pipe, another road is high temperature oil pipe, this oil pipe is provided with fuel heater, fuel oil this heating equipment temperature of flowing through can raise rapidly, and two-way fuel oil flows into convection heat exchange device to be mixed, test by experiment, use electric heating wire can be rapidly by more than fuel Heating to 400 ℃, normal temperature fuel oil typical temperature is 5-25 ℃; Adopt convection heat exchange mode the mixed proportion of two-way fuel oil can be adjusted to and make blended fuel oil temperature reach arbitrary temp in 5-400 ℃.
4. the thermal source that fuel heater is used under different condition is different; When the utility model during experimental stand, for guaranteeing the stability of heating, can adopt electric heating wire to heat as spraying; In service in actual diesel engine, can adopt the waste gas of diesel emission to heat (specifically adding heat exchange method can be with reference to another granted patent of the utility model author: viscosity control type marine engine heavy oil multi-stage heating system and heating means).
5. the utility model ECU can send two groups of signals and control respectively Liang Ge actuator, one group of signal is passed to stepper motor, thereby stepper motor accepts can to control after ECU signal overlapping degree that UNICOM's axle rotation angle adjusts respectively two throttle orifices and high temperature oil circuit entrance and normal temperature oil circuit entrance to regulate the mixed proportion of cold and hot two road binders; Another group is to control the closure of normally open solenoid valve delivery outlet.
6. the concrete controlling method of flow control actuator is as follows: in ECU program, set an expection oil spout temperature, the temperature value detecting when temperature transducer is during higher than setting value, ECU judges and rapidly stepper motor is sent to signal, step motor control throttling UNICOM axle rotates a small angle, high temp oil-fired flow is reduced, and normal temperature fuel flow increases, until mixed flow heat exchanger reaches setting value, the signal of ECU output is ended, and stepper motor stops operating; When convection heat exchange room temperature is during lower than setting value, ECU preset program is made contrary judgement and is made step motor control throttling UNICOM axle rotate backward a small angle, until blended fuel oil while reaching the temperature of setting signal end; By this control mode, can regulate the mixed proportion of two-way fuel oil, in the transient equiliblium of fuel flow, make blended fuel oil in set temperature value.
7. when temperature does not reach setting value, not oil spout of oil sprayer, and in above-mentioned 6, flow control must could realize during in flowing state at fuel oil, for head it off, the utility model is installed a normally open solenoid valve at convection heat-exchange chamber end and is connected return tube and lead to high temperature fuel tank, normally open solenoid valve can be controlled the switching of solenoid valve delivery outlet, when blended fuel oil is during in non-setting temperature, ECU does not produce trigger signal, normally open solenoid valve is opened, now two-way fuel oil mixes and passes through return tube and return to high temperature fuel tank in mixed flow heat exchanger, whole oil-fired system forms loop, flow control actuator rotates towards that ratio that makes temperature reach setting value, until temperature reaches setting value in mixed flow heat exchanger, ECU produces trigger signal makes normally open solenoid valve closed, loop is obstructed, injection temperature while now can oil sprayer opening is setting value.
8. in convection heat exchange device, be mounted with thermometer, its effect is the real time temperature that detects blended fuel oil in convection heat-exchange chamber, and person easy to use understands blended fuel oil adjustment state.
9. convection heat exchange control gear flows to oil sprayer by convection heat-exchange chamber delivery outlet, oil sprayer oil return and the mixed flow heat exchanger high temp oil-fired being circulated by normally open solenoid valve control enter high temperature fuel tank in the lump by return line, for high temp oil-fired is dispelled the heat as early as possible, in its side, cooling fan is installed, thereby cooled fuel oil flows into normal temperature fuel tank by valve and forms circulation, flowing for convenience of fuel oil between fuel tank, high temperature fuel tank is placed in place that will be higher than normal temperature fuel tank.
10. the utility model roughly has two important purposes: one, and be arranged in diesel engine fuel oil and supply with on test-bed, can carry out the impact research of various different fuel oil temperature operating modes; Its two, can be used as the oil-fired system of large diesel engine for ship, the high temp oil-fired of the most applicable diesel combustion is provided when diesel engine actual operating mode and can accurately controls fuel oil temperature within a certain scope.
11. the utility model provide a kind of high temp oil-fired spray regime, the current oil-fired system that realizes the diesel engine of heated fuel oil is only to use electric heating wire to improve a little oil temperature to solve cold start-up problem, not yet finds that the convection heat exchange mode that the utility model proposes is applied to diesel engine field at present; This oil-fired system adopts fuel oil high temperature processing and high-temperature injection can overcome that fuel-viscosity variation is large, impurity is many, the low inferior problem of quality.
12. validity for the injection of checking high temp oil-fired, the FIRE computing platform of the utility model based on AVL company carried out numbered analog simulation to the various temperature cases of Used in Diesel Engines high temp oil-fired; Result shows to increase within the specific limits fuel oil injection temperature and is conducive to fuel-oil atmozation, and in cylinder, Sauter mean diameter can reduce by 30%, and mixed gas quality is significantly improved; The heat strengthening of fuel oil has improved firing chamber spray effect and combustion process, can obviously reduce discharge; But different diesel engines have the fuel oil temperature of different " optimum "; The utility model provides guarantee for accurately supplying with fast this " preference temperature " fuel oil; Based on the above results, can think that high temp oil-fired system described in the utility model can play optimization spray effect, improve the effect of combustion process, the theoretical property of model utility has obtained certain proof.
Accompanying drawing explanation
A kind of New Type Fuel System schematic diagram that can fine adjustment diesel engine fuel injecting temperature of Fig. 1;
1 normal temperature fuel tank; 2 high pressure oil pumps; 3 oil transfer pumps; 4 filter cleaners; 5 are total to rail; 6 normal temperature oil circuits; 7 high temperature oil circuits; 8 fuel heaters; 9 convection heat exchange devices; 10 are total to rail Decompression valves; 11 flow control actuators; 12 oil sprayers; 13 return tubes; 14 high temperature fuel tanks; 15 cooling fans; 16 valves;
Fig. 2 flow control actuator schematic diagram;
17 high temperature oil circuit imports; 18 throttle orifices; 19 normal temperature oil circuit imports; 20 throttling UNICOM axles; 21 agitator arms; 22 normally open solenoid valves; 23 normally open solenoid valve delivery outlets; 24 mixed flow heat exchangers; 25 mixed flow heat exchanger delivery outlets; 26 temperature transducers; 27 thermometers; 28 coupling; 29 stepper motors; 30 circuit interfaces; 31 housings.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
Normal temperature fuel oil provides power to transport to high pressure oil pump 2 through filter cleaner 4 by oil transfer pump 3, in high pressure oil pump 2, pressurized stream is to being total to rail 5, fuel oil by common rail 5 outputs is divided into two-way, the road normal temperature oil pipe 6 of flowing through wherein, another road high temperature oil pipe 7 of flowing through, fuel heater 8 can heat the fuel oil of the high temperature oil pipe 7 of flowing through rapidly, and two-way fuel oil flows into convection heat exchange control gear 9 to be mixed, and the unnecessary fuel oil of rail 5 connects normal temperature fuel tank 1 by the oil circuit that rail Decompression valves 10 is controlled altogether altogether.
Two-way fuel oil enters after flow control actuator 11 by high temperature oil circuit import 17 normal temperature oil circuit imports 19, through throttling UNICOM axle 20, under agitator arm 21 guiding, entering mixed flow heat exchanger 24 mixes, circuit interface 30 is connected with ECU, the temperature data that temperature transducer 26 detects blended fuel oil is transferred to ECU by circuit interface, ECU carries out size judgement to its value and programmed values, if blended fuel oil temperature is higher than setting value, ECU program is sent signal controling stepping motor 29Shi throttling UNICOM axle 20 and is rotated a small angle, the flow of high temperature oil circuit 7 is reduced, normal temperature oil circuit 6 flows increase, to reach the object that reduces blended fuel oil temperature, when this adjustment process is carried out, because not reaching closed controlled conditions, normally open solenoid valve 22 is opened, fuel oil in mixed flow heat exchanger 24 can flow into high temperature fuel tanks by normally open solenoid valve delivery outlet 23, static and make whole oil circuit become " dead volume " in mixed flow heat exchanger 24 with regard to not causing fuel oil like this, when the temperature signal of temperature transducer 26 transmission is during lower than setting value, by control step motor 29, make it rotate in the opposite direction a small angle, to reach, increase the object that high temp oil-fired ratio improves oil temperature, through above two kinds of control modes, make fuel oil temperature more and more approach the fuel oil injection temperature of setting, when mixed flow heat exchanger 24 intermediate fuel oil temperature reach setting value just, ECU control step motor 29 stops, the angle that during parking, throttling UNICOM axle 20 rotates is the best angle that makes fuel oil reach set-point temperature, send other one group of signal by normally open solenoid valve 22 closures simultaneously, oil circuit sealing, the temperature of thermometer 27 indications is setting value, fuel oil is transported to oil sprayer 12 from mixed flow heat exchanger delivery outlet 25, temperature by oil sprayer 12 ejection fuel oils is setting value, in the process of spraying, when finding that thermometer 27 showing temperatures exceed error permissible range, can close oil sprayer 12, wait for that convection heat exchange control gear 9 regulates until temperature reaches setting value.
Fuel oil in oil sprayer oil return and adjusting blended fuel oil ratio process enters high temperature fuel tank 14 by return tube 13, this part fuel oil temperature is higher, therefore at high temperature fuel tank 14 sidewalls, cooling fan 15 being installed dispels the heat, when fuel cools to normal temperature, can open valve 16 and make it to flow into normal temperature fuel tank 1, for convenience of fuel flow, high temperature fuel tank 14 is placed in place that will be higher than normal temperature fuel tank 1, and fuel oil forms circulation and reused in whole oil-fired system.
Claims (4)
1. can accurately control an oil-fired system for diesel engine fuel injecting temperature, it is characterized in that: described oil-fired system comprises filter cleaner, oil transfer pump, high pressure oil pump, is total to rail, fuel heater, convection heat exchange device, oil sprayer, high temperature fuel tank, normal temperature fuel tank and cooling fan; Oil transfer pump one end is connected with normal temperature fuel tank, and the other end connects filter cleaner, and fuel oil enters high pressure oil pump after filter cleaner purifies, and high pressure oil pump, for common rail provides high pressure fuel, is total to the unnecessary fuel oil of rail and flows into normal temperature fuel tank by the pressure release oil duct of being controlled by common rail Decompression valves; Rail is exported two oil circuits altogether, and one is high temperature oil circuit, and another is normal temperature oil circuit; High temperature oil circuit is provided with fuel heater, and two oil circuits connect convection heat exchange device, and convection heat exchange device has two delivery outlets, and wherein one is mixed flow heat exchanger delivery outlet, connects oil sprayer; Another delivery outlet is normally open solenoid valve delivery outlet, by normally open solenoid valve, control its switching and access high temperature fuel tank by return tube, oil sprayer is also connected with high temperature fuel tank by return tube, between high temperature fuel tank and normal temperature fuel tank, is provided with oil circuit, by valve, controls its switching.
2. a kind of oil-fired system that can accurately control diesel engine fuel injecting temperature as claimed in claim 1, it is characterized in that: convection heat exchange device YouECUHe convection control actuator forms, described convection control actuator is mainly by housing, throttling UNICOM axle, agitator arm, thermometer, normally open solenoid valve, coupling, stepper motor, temperature transducer forms, the oil inlet end of housing has high temperature oil circuit entrance and normal temperature oil circuit entrance, the top and bottom of throttling UNICOM axle are separately fixed at upper wall the inner and lower wall the inner of housing, wherein the entrance intersection of throttling UNICOM axle and high temperature oil circuit and normal temperature oil circuit has two mutually perpendicular two throttle orifices of central axis, throttling UNICOM axle upper end is connected with the stepper motor being fixed on the upper wall outer end of housing by coupling, thereby stepper motor accepts to control after ECU signal overlapping degree that UNICOM's axle rotation angle adjusts respectively two throttle orifices and high temperature oil circuit entrance and normal temperature oil circuit entrance to regulate the mixed proportion of cold and hot two road binders, throttling UNICOM axle right side is mixed flow heat exchanger, throttling UNICOM axle right-hand member is provided with an agitator arm fully to be mixed for cold and hot two-way fuel oil, housing oil outlet end has mixed flow heat exchanger delivery outlet and communicates with mixed flow heat exchanger, normally open solenoid valve is arranged on the end bottom of mixed flow heat exchanger, by ECU, controlled, its effect is the switching of controlling return tube, return tube becomes loop with high temperature oil box-shaped, thermometer and temperature transducer are stretched into mixed flow heat exchanger and are interference fit to fix with housing upper wall by housing pore that upper wall is opened.
3. a kind of oil-fired system that can accurately control diesel engine fuel injecting temperature as claimed in claim 1, is characterized in that: on described high temperature fuel tank sidewall, cooling fan be installed and be placed in than higher place, normal temperature fuel tank position.
4. a kind of oil-fired system that can accurately control diesel engine fuel injecting temperature as claimed in claim 2, is characterized in that: described stepper motor, temperature transducer and normally open solenoid valve are connected with ECU by circuit interface respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421330.9U CN203742857U (en) | 2013-07-16 | 2013-07-16 | Fuel oil system capable of accurately controlling oil injection temperature of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320421330.9U CN203742857U (en) | 2013-07-16 | 2013-07-16 | Fuel oil system capable of accurately controlling oil injection temperature of diesel engine |
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| Publication Number | Publication Date |
|---|---|
| CN203742857U true CN203742857U (en) | 2014-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320421330.9U Expired - Fee Related CN203742857U (en) | 2013-07-16 | 2013-07-16 | Fuel oil system capable of accurately controlling oil injection temperature of diesel engine |
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| CN (1) | CN203742857U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437929A (en) * | 2013-07-16 | 2013-12-11 | 江苏大学 | Fuel oil system and control method capable of accurately controlling oil injection temperature of diesel engine |
| CN107806386A (en) * | 2017-12-05 | 2018-03-16 | 北京理工大学 | A kind of overcritical fuel injection system |
-
2013
- 2013-07-16 CN CN201320421330.9U patent/CN203742857U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103437929A (en) * | 2013-07-16 | 2013-12-11 | 江苏大学 | Fuel oil system and control method capable of accurately controlling oil injection temperature of diesel engine |
| CN103437929B (en) * | 2013-07-16 | 2016-01-27 | 江苏大学 | A kind of oil-fired system and controlling method that accurately can control oil injection temperature of diesel engine |
| CN107806386A (en) * | 2017-12-05 | 2018-03-16 | 北京理工大学 | A kind of overcritical fuel injection system |
| CN107806386B (en) * | 2017-12-05 | 2024-03-12 | 北京理工大学 | Supercritical fuel injection system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140730 Termination date: 20150716 |
|
| EXPY | Termination of patent right or utility model |