CN105240168A - Diesel engine fuel oil preheater and preheating method based on quick-heating and slow-heating strategies - Google Patents
Diesel engine fuel oil preheater and preheating method based on quick-heating and slow-heating strategies Download PDFInfo
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- CN105240168A CN105240168A CN201510690411.2A CN201510690411A CN105240168A CN 105240168 A CN105240168 A CN 105240168A CN 201510690411 A CN201510690411 A CN 201510690411A CN 105240168 A CN105240168 A CN 105240168A
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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
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Abstract
The invention belongs to the field of internal combustion engine engineering, and discloses a diesel engine fuel oil preheater and preheating method based on quick-heating and slow-heating strategies. The fuel oil preheater comprises a slow-heating fuel oil chamber, a quick-heating fuel oil chamber and an ECU. The quick-heating fuel oil chamber is installed inside the slow-heating fuel oil chamber. An oil inlet is formed in the quick-heating fuel oil chamber which is communicated with the slow-heating fuel oil chamber through the oil inlet. An electric heater is installed inside the quick-heating fuel oil chamber. The outer surface of the slow-heating fuel oil chamber is tightly wrapped by a water-bath heater. The ECU is connected with a plurality of thermocouples. The thermocouples are arranged inside the slow-heating fuel oil chamber and the quick-heating fuel oil chamber and used for measuring the temperature of fuel oil. The ECU needs to monitor the temperature of the fuel oil and the state of a diesel engine in real time. The initial temperature of diesel oil is used as the basis for judging whether the quick-heating mode is enabled or not. The environment temperature is the condition for judging whether water-bath fuel oil preheating is adopted or not. The action of the working performance of the diesel engine at low temperature is improved.
Description
Technical field
The invention belongs to internal-combustion engine engineering field, fuel oil match equipment technical field, be specifically related to based on anxious heat and fuel preheater for diesel engine and the heating means thereof of delaying heat strategy.
Background technique
Northern China and High Altitude in West China region, in 1 year, the low temperature time is longer, and Diesel Engine Mechanical all exists cold starting difficulty at low temperatures, the problem that fuel consume increases.Fuel-firing preheating technology is that current application is the most general, has been known as the engine cold starting improving environment of equal importance with charge heating.Fuel-firing preheating improves the method for low-temp. starting of IC. engine performance, is applied well at nearly 10 years.Which, by heated fuel oil, directly can improve the atomization quality of fuel oil, to improving the improved action of engine cold starting performance clearly.At present, a lot of local large vehicle of northern China is typically equipped with fuel heater.When temperature be low to moderate motor not easily start time, fuel heater just to fuel oil implement heating, fuel oil temperature can be increased to 30-50 DEG C, engine low-temperature starting-up problem can be resolved substantially.
Fuel heating method has directly heating and indirect heating two kinds.Direct heating generally adopts electric heating or fuel heater, directly electric energy or oil inflame heat is implemented preheating to fuel oil.Indirect heating has the form such as heating water bath, gas-heated, it is characterized in that thermal source does not directly heat fuel oil, but heats medium (such as water, gas), and then medium transfers heat to fuel oil, realizes the object of fuel Heating.
Fuel-firing preheating adopt thermal source can be electric energy produce, also have from oil burner or motor.For large-sized diesel motor, the maximum fuel Heating thermal source of current application is from motor, by current or airflow pipeline design, utilize soaking method or gas-heated method, the heat of engine body tail gas or cooling water is passed to the fuel oil of lower temperature, play lifting fuel oil temperature, improve fuel flow performance and atomization quality, finally play the effect improving diesel combustion.For small diesel engine, because housing construction is compacter, it is more difficult that water-bath or airflow path design, water-bath and the less employing of gas heated fuel oil method.Water-bath and gas heated fuel oil method also have employing fuel oil or Electric heating, and it realizes principle and substantially heats similar to utilizing diesel engine vent gas or cooling water heat.
Because tail gas during diesel engine starting and cooling water temperature are all lower, utilize the heat of diesel engine vent gas and natural cooling water to be unpractical problem to prestart fuel Heating, Electric heating fuel oil, air inlet or electric heating cooling water medium are solve cold-starting problem most popular method to fuel-firing preheating.Relative electrothermal water bath fuel oil method, the direct heated fuel oil of electric energy is more effective, and one is that two is that electric energy directly heats, and efficiency is higher because Electric heating appliance is comparatively simple.Current market has a lot of ceramic heat product for engine fuel electric heater, is widely used on large-scale diesel engine.
Most fuel heating methods used at present heat whole fuel tank (or extra oil tank), there is the problem that the low and storage battery load of the efficiency of heating surface strengthens, have the risk reducing the life of storage battery and low temperature effective utilization.
Summary of the invention
The present invention is directed to the problems referred to above, propose the diesel engine fuel oil pre-heating mean of the gentle heat strategy of the anxious heat of collection, the burn deterioration problem solving engine low-temperature starting-up difficulty in the lump and cause because of low temperature, effectively promote the service behaviour under diesel engine low temperature environment.
Technological scheme of the present invention: based on the fuel preheater for diesel engine of anxious heat with slow heat strategy, its oil preheater is connected on tank oiling channel oil, comprises slow heating oil room, anxious heating oil room and ECU electronic control unit.It is indoor that described anxious heating oil room is arranged on slow heating oil, and anxious heating oil room is provided with filler opening, is communicated with by filler opening with slow heating oil room, top, anxious heating oil room sets out oil pipe, anxious heating oil indoor location electric heater; Described slow heating oil outdoor face is closely wrapped up by water-bath heater, and slow heating oil room is provided with oil inlet pipe.Described ECU electronic control unit is connected with several thermocouples, and thermocouple is arranged in slow heating oil room and anxious heating oil is indoor, for measuring fuel oil temperature.
The control circuit of described electric heater is connected with ECU electronic control unit, controls its running state by ECU electronic control unit.
The outlet pipe of described water-bath heater is provided with micro pump, and micro pump control circuit is connected with ECU electronic control unit, controls its running state by ECU electronic control unit.
At low ambient temperatures, by the slow heating oil room of diesel engine fuel oil fuel tank oil pipe access oil preheater, slow heating oil room is communicated by filler opening with anxious heating oil room, and engine operation process intermediate fuel oil is full has expired whole oil preheater.
Anxious heating oil room adopts hollow to make, the heat radiation of this indoor fuel oil low temperature fuel oil towards periphery during to reduce anxious heat.Anxious heating oil room net volume is that Idling Process for Diesel Engine operates 30 seconds fuel consumption.It is indoor that anxious heating oil indoor are placed in slow heating oil.
Slow heating oil room net volume is the 10 minutes amount of fuel that operate under diesel engine efficient routine.Water-bath heater adopts panel radiator.Plate and fin type circulating water heater is trapped among slow heating oil outdoor face, and diesel oil, circulating water are separated, and break to the destruction of oil-fired system to prevent cooling jacket.
The pre-thermal recovery panel radiator of water-bath.For preventing under extremely low temperature environment, water-bath pipeline inner cold water is to the cooling of whole fuel heater, and before water-bath preheating is opened, pipeline is interior without circulating water.After diesel engine cooling coolant-temperature gage reaches specified value, water circulation is just opened.
Based on the diesel engine fuel oil pre-heating mean of anxious heat with slow heat strategy, comprise the gentle hot two-part of anxious heat.
The hot heating means of described urgency are: ECU electronic control unit, by measuring fuel oil temperature, is limited with 0 DEG C, judge whether anxious thermoelectric heater carries out preheating to fuel oil.When fuel oil temperature is higher than 0 DEG C, oil preheater does not work, and fuel oil is straight-through to be flow through, the direct normal starting of diesel engine; Fuel oil temperature is lower than 0 DEG C, and oil preheater heats the indoor fuel oil of anxious heating oil, and after temperature reaches predefined value (initial value is 60 DEG C), ECU electronic control unit provides signal designation, and now diesel engine starts to start; If diesel engine starting is unsuccessful, presetting fuel Heating temperature value increases by 10 DEG C, waits for that fuel oil temperature reaches setting temperature, and diesel engine is attempted starting again, and when after diesel engine Successful startup, anxious heating oil indoor electric heater quits work.Diesel engine starting Success Flag be engine start rotating speed more than 600 turns of parts, and speed fluctuation rate is no more than 15%.
Described slow hot heating means are: when ambient temperature is lower than 10 DEG C, after engine coolant temperature reaches 50 DEG C, ECU electronic control unit opens water-bath heater, diesel engine high-temperature cooling water enters fuel heater and starts circulation, realize fuel Heating, in heating water bath process, ECU electronic control unit is monitored oil temperature in real time, realize different heating water bath intensity by the power of the micro pump adjusting cooling water circulation, guarantee that whole fuel oil room fuel oil mean temperature is in 30-40 DEG C of interval.
ECU electronic control unit needs monitoring fuel oil temperature and diesel engine state in real time.The criterion whether diesel oil initial temperature opens as anxious hot mode of heating; The foundation that rotating speed after diesel engine starting, speed fluctuation rate terminate as anxious hot mode of heating; Ambient temperature is the condition whether adopting water-bath fuel-firing preheating; Diesel engine cooling water temperature delays as water-bath the foundation that hot mode is opened and operation intensity adjusts.
The present invention, by heated fuel oil, reduces fuel-viscosity variation and surface tension, effectively improves fuel-oil atmozation quality, promotes diesel engine service behaviour at low temperatures." anxious heat " a small amount of diesel oil of mode rapidly pre-warming, to higher temperature, promotes diesel engine low temp. starting performance, and " slow heat " mode steadily heats normal fuel injection, is beneficial to diesel combustion optimization under low temperature environment, the consumption of reduction engine fuel.Anxious heat and slow heat two kinds of fuel Heating modes all play the effect improving diesel engine low operating temperatures performance.
Accompanying drawing explanation
Fig. 1 is oil preheater structural representation.
Fig. 2 is anxious heat and the diesel engine fuel oil pre-heating mean control flow chart delaying heat strategy.
Wherein reference character, 1---slow heating oil room, 2---anxious heating oil room, 3---electric heater, 4---water-bath heater, 5---ECU electronic control unit, 6---micro pump, 7---oil circuit valve, 8---oil inlet pipe, 9---outlet pipe, 10---thermocouple, 11---oil outlet tube, 12---filler opening, 13---inlet valve.
Embodiment
By particular specific embodiment, embodiments of the present invention are described below, person skilled in the art scholar the content disclosed by this specification can understand other advantages of the present invention and effect easily.
Embodiment: based on the diesel engine fuel oil pre-heating mean of anxious heat with slow heat strategy, comprise the gentle heat of anxious heat two kinds of mode of heatings, requires that oil preheater should have the gentle hot heating function of anxious heat concurrently simultaneously.Design has anxious hot heating chamber and to ease up the oil preheater of hot heating chamber as requested, and its structure as shown in Figure 1.Anxious heating oil room 2 is arranged in slow heating oil room 1, anxious heating oil room 2 is provided with filler opening 12, is communicated with by filler opening 12 with slow heating oil room 1, after fuel oil pours into slow heating oil room 1, then flows through filler opening 12 and pours in anxious heating oil room 2.Set out oil pipe 11 at the top of anxious heating oil room 2, fuel oil is connected to oil pumping unit.In inside, anxious heating oil room 2, electric heater 3 is installed, utilizes electric heater to carry out rapid heating to indoor fuel oil.Slow heating oil room 1 is provided with oil inlet pipe 8, connects oil line pipe, by indoor for fuel oil access, inflow pipeline is also provided with oil circuit valve 7.The outer surface of slow heating oil room 1 is closely wrapped up by water-bath heater 4, utilizes hot water in the pipeline of water-bath heater 4 to carry out heat exchange, heats the fuel oil in slow heating oil room 1.
In slow heating oil room 1 and anxious heating oil room 2, be also respectively arranged with thermocouple 10, for measuring fuel oil temperature.Thermocouple 10 is connected with ECU electronic control unit 5, completes thermometry and carry out computer heating control according to measurement result by ECU electronic control unit 5.
The control circuit of described electric heater 3 is connected with ECU electronic control unit 5, controls its running state by ECU electronic control unit 5.Electric heating adopts ceramic heating flake, and design power is promote anxious heating oil room fuel oil temperature to 60 DEG C from 0 DEG C in 2 minutes.
Anxious heating oil room 2 adopts hollow to make, and anxious heating oil room net volume is that Idling Process for Diesel Engine operates 30 seconds fuel consumption.Slow heating oil room net volume is the 10 minutes amount of fuel that operate under diesel engine efficient routine.
The intake pipe of described water-bath heater 4 is provided with inlet valve 13, outlet pipe 9 is provided with micro pump 6, the control circuit of micro pump 6 is connected with ECU electronic control unit 5, controls its running state by ECU electronic control unit.Water-bath heater adopts panel radiator.Plate and fin type circulating water heater is trapped among slow heating oil outdoor face, and diesel oil, circulating water are separated, and break to the destruction of oil-fired system to prevent cooling jacket.For preventing under extremely low temperature environment, water-bath pipeline inner cold water is to the cooling of whole fuel heater, and before water-bath preheating is opened, pipeline is interior without circulating water.After diesel engine cooling coolant-temperature gage reaches specified value, water circulation is just opened.
The existing rated power in laboratory is the vehicle diesel engine of 80kW, utilizes anxious heat and slow heating oil heating means, and the oil preheater of design said structure, concrete steps are divided into the following steps.
The first step: design anxious heating oil room.After tested, 80KW Idling Process for Diesel Engine oil consumption rate is 1 l/h, and conversion is 8.3 milliliters/30 seconds.For easy to process and consider that the ceramic heating flake that anxious heat adopts infiltrates must account for certain space in fuel oil room, design the pipe that anxious heating oil room volume is 10 milliliters.
Second step; The slow heating oil room of design.Slow heating oil room net volume is the 10 minutes amount of fuel that operate under diesel engine efficient routine.Suppose that diesel engine economical consumption of fuel is 200g/kw.h, generally near motor 75% power, can calculation engine 10 minutes fuel oil consumptions be 200x80x75%x10/60=2000g, being scaled volume be 2000/0.85=2352 milliliter=2.352 liter.The concrete configuration design of slow heating oil room according to its on the engine installing space determine.
3rd step: anxious thermal power is determined.Because ceramic heater is fully immersed in fuel oil, assuming that ceramic heating flake produces heat be entirely delivered to fuel oil, ceramic radiating fin can be calculated by energy conservation always to generate heat Q=Cpm (T2-T0), in formula, Cp is the specific heat capacity of diesel oil, m is anxious heating oil room fuel bulk, T0, T2 is respectively the initial temperature of fuel oil and default cranking temperature, setting T0=0, T2=60, the anxious heating oil then heating 10 milliliters needs heat to be Q=2.48x10x0.85x60=1264.8J, then heater power W=Q/t=124.8/ (2x60)=10.54 watt, consider the factors such as heat transfer loss, heater power can increase by 20%, it is 12.6 watts.
4th step: according to machinery, fluids process requirement, making radiator is coated and select pump motor.
5th step: ECU debugs design, until the temperature meeting slow hot preheating regulates requirement.
ECU electronic control unit 5 needs to monitor fuel oil temperature and diesel engine state in real time.The criterion whether diesel oil initial temperature opens as anxious hot mode of heating; The foundation that rotating speed after diesel engine starting, speed fluctuation rate terminate as anxious hot mode of heating; Ambient temperature is the condition whether adopting water-bath fuel-firing preheating; Diesel engine cooling water temperature delays as water-bath the foundation that hot mode is opened and operation intensity adjusts.Its control flow as shown in Figure 2.
As shown in Figure 2, anxious hot heating means are: ECU electronic control unit 5, by measuring fuel oil temperature, is limited with 0 DEG C, judges whether anxious thermoelectric heater 3 carries out preheating to fuel oil.When fuel oil temperature is higher than 0 DEG C, oil preheater does not work, and fuel oil is straight-through to be flow through, the direct normal starting of diesel engine; Fuel oil temperature is lower than 0 DEG C, and oil preheater heats fuel oil in anxious heating oil room 2, and after temperature reaches predefined value (initial value is 60 DEG C), ECU electronic control unit 5 provides signal designation, and now diesel engine starts to start; If diesel engine starting is unsuccessful, presetting fuel Heating temperature value increases by 10 DEG C, waits for that fuel oil temperature reaches setting temperature, and diesel engine is attempted starting again, and when after diesel engine Successful startup, anxious heating oil indoor electric heater quits work.Diesel engine starting Success Flag be engine start rotating speed more than 600 revs/min, and speed fluctuation rate is no more than 15%.
Slow hot heating means are: when ambient temperature is lower than 10 DEG C, after engine coolant temperature reaches 50 DEG C, ECU electronic control unit opens water-bath heater, diesel engine high-temperature cooling water enters fuel heater and starts circulation, realize fuel Heating, in heating water bath process, ECU electronic control unit is monitored oil temperature in real time, realize different heating water bath intensity by the power of the micro pump adjusting cooling water circulation, guarantee that whole fuel oil room fuel oil mean temperature is in 30-40 DEG C of interval.
Above-described embodiment is illustrative principle of the present invention and effect thereof only, but not for limiting the present invention.Any person skilled in the art scholar all without prejudice under spirit of the present invention and category, can modify above-described embodiment or changes.Therefore, such as have in art and usually know that all equivalences that the knowledgeable completes under the spirit do not departed from suggested by the present invention and technological thought are modified or change, must be wanted contained by right of the present invention.
Claims (6)
1. based on the fuel preheater for diesel engine of anxious heat with slow heat strategy, its oil preheater is connected on tank oiling channel oil, it is characterized in that, described oil preheater comprises slow heating oil room (1), anxious heating oil room (2) and ECU electronic control unit (5); Described anxious heating oil room (2) is arranged in slow heating oil room (1), anxious heating oil room (2) is provided with filler opening (12), be communicated with slow heating oil room (1) by filler opening (12), anxious heating oil room (2) top sets out oil pipe (11), installs electric heater (3) in anxious heating oil room (2); Described slow heating oil room (1) outer surface is closely wrapped up by water-bath heater (4), and slow heating oil room (1) is provided with oil inlet pipe (8); Described ECU electronic control unit (5) is connected with several thermocouples (10), and thermocouple (10) is arranged in slow heating oil room (1) and anxious heating oil room (2), for measuring fuel oil temperature.
2. according to claim 1 based on the fuel preheater for diesel engine of anxious heat with slow heat strategy, it is characterized in that, the control circuit of described electric heater (3) is connected with ECU electronic control unit (5), controls its running state by ECU electronic control unit (5).
3. according to claim 1 based on the fuel preheater for diesel engine of anxious heat with slow heat strategy, it is characterized in that, the outlet pipe (9) of described water-bath heater (4) is provided with micro pump (6), micro pump (6) control circuit is connected with ECU electronic control unit (5), controls its running state by ECU electronic control unit (5).
4. according to claim 1ly it is characterized in that based on the fuel preheater for diesel engine of anxious heat with slow heat strategy, described anxious heating oil room net volume is that Idling Process for Diesel Engine operates 30 seconds fuel consumption amounts.
5. the fuel preheater for diesel engine tactful with slow heat based on suddenly heat according to claim 1, is characterized in that, slow heating oil room net volume is the 10 minutes amount of fuel that operate under diesel engine efficient routine.
6. based on the diesel engine fuel oil pre-heating mean of anxious heat with slow heat strategy, it is characterized in that, comprise the gentle hot two-part of anxious heat, the hot heating means of described urgency are: ECU electronic control unit (5), by measuring fuel oil temperature, is limited with 0 DEG C, judge whether anxious thermoelectric heater carries out preheating to fuel oil, when fuel oil temperature is higher than 0 DEG C, oil preheater does not work, and fuel oil is straight-through to be flow through, the direct normal starting of diesel engine; Fuel oil temperature is lower than 0 DEG C, oil preheater heats the interior fuel oil of anxious heating oil room (2), after temperature reaches predefined value (initial value is 60 DEG C), ECU electronic control unit (5) provides signal designation, and now diesel engine starts to start; If diesel engine starting is unsuccessful, preset fuel Heating temperature value and increase by 10 DEG C, wait for that fuel oil temperature reaches setting temperature, diesel engine is attempted starting again, when after diesel engine Successful startup, anxious heating oil room (2) interior electric heater (3) quits work, diesel engine starting Success Flag be engine start rotating speed more than 600 revs/min, and speed fluctuation rate is no more than 15%;
Described slow hot heating means are: when ambient temperature is lower than 10 DEG C, after engine coolant temperature reaches 50 DEG C, ECU electronic control unit (5) opens water-bath heater (4), diesel engine high-temperature cooling water enters fuel heater and starts circulation, realize fuel Heating, in heating water bath process, ECU electronic control unit (5) is monitored oil temperature in real time, realize different heating water bath intensity by the power of the micro pump (6) adjusting cooling water circulation, guarantee that whole fuel oil room fuel oil mean temperature is in 30-40 DEG C of interval.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510690411.2A CN105240168A (en) | 2015-10-15 | 2015-10-15 | Diesel engine fuel oil preheater and preheating method based on quick-heating and slow-heating strategies |
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| CN201510690411.2A CN105240168A (en) | 2015-10-15 | 2015-10-15 | Diesel engine fuel oil preheater and preheating method based on quick-heating and slow-heating strategies |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114139356A (en) * | 2021-11-22 | 2022-03-04 | 北京理工大学 | Design method for minimum preheating power of diesel engine heating pot with low-temperature adaptability |
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2015
- 2015-10-15 CN CN201510690411.2A patent/CN105240168A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114139356A (en) * | 2021-11-22 | 2022-03-04 | 北京理工大学 | Design method for minimum preheating power of diesel engine heating pot with low-temperature adaptability |
| CN114139356B (en) * | 2021-11-22 | 2023-08-04 | 北京理工大学 | Minimum preheating power design method for diesel heating pot with low-temperature adaptability |
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