CN106285917B - A kind of diesel engine starting auxiliary system and method suitable for high altitude localities - Google Patents
A kind of diesel engine starting auxiliary system and method suitable for high altitude localities Download PDFInfo
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- CN106285917B CN106285917B CN201610635694.5A CN201610635694A CN106285917B CN 106285917 B CN106285917 B CN 106285917B CN 201610635694 A CN201610635694 A CN 201610635694A CN 106285917 B CN106285917 B CN 106285917B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/14—Control of the alternation between or the operation of exhaust drive and other drive of a pump, e.g. dependent on speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D23/00—Controlling engines characterised by their being supercharged
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D33/00—Controlling delivery of fuel or combustion-air, not otherwise provided for
- F02D33/02—Controlling delivery of fuel or combustion-air, not otherwise provided for of combustion-air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/1015—Air intakes; Induction systems characterised by the engine type
- F02M35/10157—Supercharged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10255—Arrangements of valves; Multi-way valves
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present invention relates to a kind of diesel engine starting auxiliary systems and method suitable for high altitude localities, the system includes additional mechanical supercharging air inlet pipe, low-pressure ratio large flow fluid machinery, barometric pressure sensor, cooling-water temperature transmitter and control unit, air inlet is separately connected the inlet end of the inlet end and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe by gas distribution valve, the inlet end of charge air cooler is separately connected the outlet side of the outlet side and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe by gas converging valve, low-pressure ratio large flow fluid machinery is set in additional mechanical supercharging air inlet pipe, the inlet end of the outlet side connection engine of charge air cooler, barometric pressure sensor is set on air inlet, cooling-water temperature transmitter is set in transmitter.Compared with prior art, starting success rate of the engine under High aititude can be improved in the present invention, shortens semi-diesel engine and starts speed up time, so that diesel engine is faster entered and stablizes idling mode.
Description
Technical field
The present invention relates to Diesel Engine Technique Fields, auxiliary more particularly, to a kind of diesel engine starting suitable for high altitude localities
Auxiliary system and method.
Background technology
Semi-diesel engine is an important trend in diesel engines at present field, mainly due to discharging both at home and abroad
Becoming for regulation is tight so that diesel engine discharged nitrous oxides and granular material discharged control technology are greatly developed, and Reduction for Diesel Engines
Outburst pressure and temperature is all declined in cylinder after low compression ratio, and the row of diesel engine nitrogen oxides and particulate matter can be greatly decreased
It puts.Another benefit that Reduction for Diesel Engines low compression ratio is brought is that the mechanical load of diesel engine and thermic load are all obviously reduced, this is just
Necessary condition is provided for diesel engine lightweight and high rotating speed.Some high power density diesel engines simultaneously generally use high pressure-charging
Technology improves power density, it is also desirable to which low compression ratio reduces mechanical load and thermic load.
But semi-diesel engine a main problem is exactly cold post-start difficulty, mainly since diesel engine is rising
After turbocharger does not work when dynamic, and volumetric efficiency is low, and compression ratio reduces, air inlet compression finishing temperature and pressure in cylinder of diesel engine
Power can all be significantly lower than high compression ratio diesel engine, cause fuel-oil atmozation to be deteriorated, temperature and pressure is difficult to reach ignition condition.It is this
Problem is more serious under altitude environment, because plateau atmospheric pressure is low so that air mass declines when diesel engine starting, compression
The temperature and pressure of gas in the jar further declines when end of a period so that starts more difficult.
At present for the improvement of diesel engine plateau cold post-start, two kinds of technology paths are generally used, one is to air inlet, cold
But water or machine oil etc. are heated, another is carried out to engine charge when either being started using compressed air starting
Tonifying Qi.The first technology path is due to needing heating such as air, coolant liquid or machine oil, so needing to wait for the long period
Can start, influence working efficiency, while the energy consumption needed for heating is very big, if if electrical heating it is also contemplated that power supply is taken and is asked
Topic.Second method need not heat, such as compressed air starting, and the pressure-air in air accumulator does work in diesel engine directly and goes
Journey is passed through cylinder, pushes piston acting raising speed, the method to be widely used with large-scale diesel engine in ship, is primarily due to ship all
Equipped with high-power air compressor machine, compressed air can be constantly supplemented into air accumulator；And it is in diesel engine starting to start air inlet tonifying Qi
To intake manifold auxliary air in dragging process, increase air mass, so as to improve mixed gas quality in cylinder, reaches and shorten the starting time
Purpose.Starting air inlet tonifying Qi at present, also there are two types of methods, and one is air accumulators to engine charge tonifying Qi, and one is electric turbines
Engine charge tonifying Qi.On vehicle and mechanically moving, air accumulator is big since volume can not possibly be done, so needing very high pressure
Power just can guarantee enough gas-storing capacities, and air accumulator has the height for reaching 8MPa at present, have certain risk, and air accumulator needs
Being equipped with the air compressor machine of high-power high voltage contracting ratio could continue to use, and otherwise need to be replaced frequently, make troubles to using.Electronic whirlpool
The existing use on gasoline engine at present is taken turns, but is used on a diesel engine and less, mainly electric turbine needs to be directed to engine
Individually research and development, and complicated control strategy is needed, cost is very high, and stability is difficult to ensure, so being difficult to answer on a large scale
With.
In order to allow diesel engine conveniently, successfully to be started in altitude environment, while reducing to the greatest extent and diesel engine is changed
It is dynamic, it needs to be improved on starting supplementing method for air.Semi-diesel engine how is allowed to be accomplished under altitude environment quickly suitable
The starting of profit, reduces the change to diesel engine to the greatest extent, while can ensure higher stability, is at present in semi-diesel engine
Plateau cold post-start urgent problem.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind being suitable for High aititude
Starting success rate of the engine under High aititude can be improved in the diesel engine starting auxiliary system and method in area, shortens low pressure contracting
Than diesel engine starting speed up time, so that diesel engine is faster entered and stablize idling mode, it is difficult to solve diesel engines at present plateau starting
The problem of.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of diesel engine starting auxiliary system suitable for high altitude localities is used for the starting of auxiliary diesel, the bavin
Oil machine includes air inlet, turbocharging air inlet pipe, charge air cooler and engine, which includes additional mechanical supercharging air inlet pipe, low-pressure ratio
Large flow fluid machinery, barometric pressure sensor, cooling-water temperature transmitter and control unit, the air inlet pass through gas point
Stream valve is separately connected the inlet end of the inlet end and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe, the inlet end of the charge air cooler
The outlet side of the outlet side and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe, the low pressure are separately connected by gas converging valve
It is set in additional mechanical supercharging air inlet pipe than large flow fluid machinery, the inlet end of the outlet side connection engine of charge air cooler is described big
Air pressure force snesor is set on air inlet, and the cooling-water temperature transmitter is set in transmitter, and described control unit connects respectively
Connect low-pressure ratio large flow fluid machinery, gas converging valve, gas distribution valve, barometric pressure sensor, cooling-water temperature transmitter
And engine.
Under original state, gas distribution valve and gas converging valve open air inlet and enter charge air cooler through turbocharging air inlet pipe
First passage and close air inlet and enter the second channel of charge air cooler, while low-pressure ratio big flow stream through additional mechanical supercharging air inlet pipe
Body machinery does not work, and after control unit receives the starting-up signal of engine, receives the cooling of coolant temperature sensor acquisition respectively
Atmospheric pressure at liquid temperature and the air inlet of barometric pressure sensor acquisition, when judge current coolant temperature less than it is current greatly
When desired temperature under atmospheric pressure, control unit respectively to gas distribution valve and the output auxiliary starter instruction of gas converging valve,
It is instructed simultaneously to low-pressure ratio large flow fluid machinery output services, first passage is closed at this time and second channel is opened, until hair
Motivation rotating speed reaches setting speed, and gas distribution valve, gas converging valve and low-pressure ratio large flow fluid mechanical return return initial shape
State.
The compression ratio value range of the low-pressure ratio large flow fluid machinery is 1.2-1.6.
The flow of the low-pressure ratio large flow fluid machinery is related with engine displacement and idling speed, meets following public
Formula：
Q=0.036 × P × V
In formula, Q indicates flow, unit m3/ h, P indicate that engine displacement, unit L, V indicate idling speed, unit
For r/min.
The low-pressure ratio large flow fluid machinery uses centrifugal-flow compressor, vortex pump or axial-flow compressor.
The low-pressure ratio large flow fluid machinery is worked by storage battery power supply.
The atmospheric pressure for including current diesel engine desired temperature under different atmospheric pressures is stored in described control unit
Power-coolant temperature MAP chart, atmospheric pressure and coolant temperature in the atmospheric pressure-coolant temperature MAP chart meet with
Lower formula：
Tc=0.083Pa 2-1.897Pa+349.841
In formula, TcIndicate coolant temperature, unit K, PaIndicate atmospheric pressure, unit kPa.
The additional mechanical supercharging air inlet pipe is equipped with automatic pressure relief valve, and automatic pressure relief valve is big in additional mechanical supercharging air inlet overpressure
It is opened when fluid machinery maximum working pressure (MWP).
Air filter is equipped at the air inlet.
A kind of diesel engine starting householder method realized using above-mentioned system suitable for high altitude localities, including following step
Suddenly：
1) atmospheric pressure at coolant temperature and air inlet is acquired, and engine charge mode is initially set to：Open into
Gas port enters the first passage of charge air cooler through turbocharging air inlet pipe and closes cold during air inlet enters through additional mechanical supercharging air inlet pipe
The second channel of device；
2) current coolant temperature is judged whether less than the desired temperature under current atmospheric pressure, if so, executing step
It is rapid 3), if it is not, thening follow the steps 4)；
3) air inlet is closed to enter the first passage of charge air cooler through turbocharging air inlet pipe and open air inlet through auxiliary increasing
It is pressed into the second channel that tracheae enters charge air cooler, engine charge all flows through low-pressure ratio large flow fluid machinery, executes step
5)；
4) initial setting up for maintaining engine charge mode, executes step 5)；
5) judge whether engine speed reaches setting speed, if so, engine start success, engine charge mode
It is set as the mode of initial setting up, if it is not, then jump procedure 2).
Compared with prior art, the present invention has the following advantages：
1) present invention realizes the fully automated control of engine cold starting, does not need individual air filter, can be
Meet the needs of diesel engine is to supply gas pressure and air demand under the premise of compared with low power consumption, significantly improves engine under High aititude
Starting success rate, shorten semi-diesel engine start speed up time, can make diesel engine faster enter stablize idling mode, solve
The certainly problem of diesel engines at present plateau starting difficulty.
2) present invention can judge whether to need auxiliary starter according to environment atmospheric pressure and engine coolant temperature, control
Prestore the starting auxiliary judgment MAP chart of engine in unit, and the coolant temperature limit value under different atmospheric pressures is also different, when
Engine coolant temperature is less than the coolant temperature limit value under current atmospheric pressure, then is auxiliary starter, otherwise normal starting
It need not assist, this judgment method ensure that the accuracy for starting auxiliary judgment, and be related to that parameter is few, advantageously reduce control
Complexity, while will not have a negative impact to control strategy.
3) the starting auxiliary judgment MAP chart in control unit of the present invention can be demarcated according to different engines, be had
Flexibility.The performance of different diesel engines is different, and different operating occasion requires also difference to the starting performance of diesel engine, this is allowed for
The starting auxiliary judgment of different diesel engines is also different, and the starting auxiliary judgment MAP chart in control unit can be according to different hairs
Motivation carries out flexible calibration, it is ensured that can apply on all diesel engines, wherein MAP chart uses quadratic equation functional form can be with
Relationship most preferably between reactive atmosphere pressure and coolant temperature.
4) present invention employs low-pressure ratio large flow fluid machineries to be supplied, have air demand it is big, it is efficient, energy consumption compared with
The features such as low.It being supplied compared to previous air accumulator, low-pressure ratio large flow fluid mechanical ventilation amount is big, while need not be additional
Air accumulator arrangement space, and under the conditions of same air demand, low-pressure ratio large flow fluid machinery small volume is conducive in vehicle
It is arranged on mechanically moving.The compression ratio of low-pressure ratio large flow fluid machinery and gas supply flow can be according to diesel engines simultaneously
Demand carries out type selecting, ensures that the diesel engine of various models can have suitable supply gas pressure and air demand at the start, simultaneously to the greatest extent
Amount reduces power consumption.Low-pressure ratio large flow fluid mechanical efficiency is higher, does not need prodigious power, so being particularly suitable for electricity
Bottle as on the vehicle and mechanically moving of power supply, meets rapidly run air inlet the needs of.
5) present invention proposes preferred scheme to the type selecting of low-pressure ratio large flow fluid machinery, and wherein low-pressure ratio is finger pressure
Contracting is 1.2-1.6 than value range, while the flow of fluid machinery is related with engine displacement and idling speed, to ensure to make up
The low air inlet demand of High aititude pressure facilitates user to improve engine structure according to standardization preferred embodiment, highly practical.
6) present invention is small to primary motivation machine structural modification, and realizes and automatically control.Start-up assist system need not be additional
Air filter is installed, but gas is taken from the air inlet pipe after original machine air filter, is sent into charge air cooler after fluid machinery compression, institute
Not need big change to original machine.And start-up assist system has control unit, is connect with Engine ECU control unit, it can
Automatically start-up assist system is controlled, does not need manual operation, reduce the workload of driver.
Description of the drawings
Fig. 1 is the structural schematic diagram of present system；
Fig. 2 unit and its input/output signal schematic diagram in order to control；
Fig. 3 is atmospheric pressure-coolant temperature MAP chart.
In figure：1, air filter, 2, gas distribution valve, 3, low-pressure ratio large flow fluid machinery, 4, automatic pressure relief valve, 5,
Gas converging valve, 6, charge air cooler, 7, engine air inlet tube, 8, engine, 9, cooling-water temperature transmitter, 10, engine exhaust
Pipe, 11, turbocharger, 12, barometric pressure sensor, 13, accumulator, 14, control unit, 15, air inlet, 16, turbine increases
It is pressed into tracheae, 17, additional mechanical supercharging air inlet pipe.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
As shown in Figure 1, a kind of diesel engine starting auxiliary system suitable for high altitude localities, for solving current diesel oil
Machine, the especially problem of semi-diesel engine plateau starting difficulty, and can be according to different engines 8 to playing dynamic auxiliary control
Strategy is demarcated, and diesel engine includes air inlet 15, turbocharging air inlet pipe 16, charge air cooler 6 and engine 8, turbocharging into
The engine exhaust in engine 8 is arranged in one end of setting turbocharger 11, the other end of turbocharger 11 in tracheae 16
On pipe 10, air filter 1 is equipped at air inlet 15, which includes additional mechanical supercharging air inlet pipe 17, low-pressure ratio large flow fluid
Machinery 3, barometric pressure sensor 12, cooling-water temperature transmitter 9 and control unit 14, air inlet 15 pass through gas distribution valve 2
It is separately connected the inlet end of the inlet end and additional mechanical supercharging air inlet pipe 17 of turbocharging air inlet pipe 16, the inlet end of charge air cooler 6 is logical
Cross the outlet side that gas converging valve 5 is separately connected the outlet side and additional mechanical supercharging air inlet pipe 17 of turbocharging air inlet pipe 16, low pressure
It is set in additional mechanical supercharging air inlet pipe 17 than large flow fluid machinery 3, the inlet end of the outlet side connection engine 8 of charge air cooler 6, greatly
Air pressure force snesor 12 is set to the outer any position that can accurately measure atmospheric pressure of pipe at air inlet 15, cooling-water temperature transmitter
9 are set in transmitter cooling jacket, and low-pressure ratio large flow fluid machinery 3 is distinguished by 13 powered operation of accumulator, control unit 14
Connect low-pressure ratio large flow fluid machinery 3, gas converging valve 5, gas distribution valve 2, barometric pressure sensor 12, coolant temperature
Sensor 9 and engine 8, air enter engine 8 after the cooling of charge air cooler 6 by engine air inlet tube 7, what engine 8 generated
Exhaust gas enters turbocharger 11 via the exhaust pipe of engine 10, is discharged in air later.
Gas distribution valve 2 is used for controlling the air for coming from air filter 1 flow direction, the valve location of gas distribution valve 2
There are two only, position one is the channel closed towards fluid machinery, and air all flows into turbocharger 11；Position two is to close
Towards the channel of turbocharger 11, air whole incoming fluid machinery.Similarly, gas converging valve 5 is used for controlling in entrance
The air direction of flow of cooler 6, there are two the valve locations of gas converging valve 5, and position one is during closing fluid machinery leads to
The channel of cooler 6, the air only from turbocharger 11 flow into charge air cooler 6；Position two is to close to lead to turbocharger
11 channel, the only air from fluid machinery flow to charge air cooler 6.Gas converging valve 5 and gas flow divider 2 are all made of automatically controlled
Valve.
The compression ratio value range of low-pressure ratio large flow fluid machinery 3 is 1.2-1.6, while low-pressure ratio large flow fluid machine
The flow of tool 3 is related with 8 discharge capacity of engine and idling speed, meets following formula：
Q=0.036 × P × V
In formula, Q indicates flow, unit m3/ h, P indicate that engine displacement, unit L, V indicate idling speed, unit
For r/min.Low-pressure ratio large flow fluid machinery 3 can select different types and different compression ratio and stream according to engine demand
Amount, to meet engine start back-up needs, such as centrifugal-flow compressor, vortex pump, axial-flow compressor.
Additional mechanical supercharging air inlet pipe 17 is equipped with automatic pressure relief valve 4, and automatic pressure relief valve 4 is close to fluid machinery, and along air stream
To positioned at fluid machinery rear, fluid machinery maximum working pressure (MWP) is pre-seted, automatic pressure relief valve 4 is in additional mechanical supercharging air inlet pipe 17
Pressure is opened when being more than fluid machinery maximum working pressure (MWP), and pressure reduction is that setting pressure is closed.
Prestore engine atmospheric pressure-coolant temperature MAP chart in control unit 14, it is corresponding under each atmospheric pressure
Coolant temperature setting value it is different (such as：When atmospheric pressure is low, engine 8 needs higher coolant temperature that could normally rise
Dynamic, and when atmospheric pressure is high, engine 8 can normal starting under relatively low coolant temperature), MAP according to 8 difference of engine and
Using different calibration, as shown in figure 3, the atmospheric pressure and coolant temperature in atmospheric pressure-coolant temperature MAP chart meet
Following formula：
Tc=0.083Pa 2-1.897Pa+349.841
In formula, TcIndicate coolant temperature, unit K, PaIndicate atmospheric pressure, unit kPa.When atmospheric pressure senses
After the signal transmission to control unit 14 of cooling-water temperature transmitter 9 in device 12 and engine water jacket, control unit 14 by its
It is compared with the MAP chart to prestore, if under current atmospheric pressure, temperature then regards as cold less than the temperature value of setting
It starts, and has carried out dynamic auxiliary.
The input/output terminal of control unit 14 as shown in Fig. 2, the Input1 of control unit 14 is engine starting-up signal,
Input2 is atmosphere pressure signal signal, and Input3 is coolant temperature signal, and Input4 is engine rotational speed signal,
Output1 signals are the signals for controlling gas distribution valve 2, and Output2 signals are the signal for controlling gas converging valve 5, Output3
Signal is the signal for controlling 3 switch of low-pressure ratio large flow fluid machinery.Control unit 14 can be controlled by Engine ECU strategy,
At the start, air inlet is pressurized by fluid machinery, volumetric efficiency when being started with Optimization of Diesel Engine, solve engine 8 by
In into that can not be started caused by unsaturated vapor the problem of.Pass through the atmospheric pressure-coolant temperature MAP chart to prestore in control unit 14
Engine start environment is judged, the atmospheric pressure deposited-coolant temperature MAP chart can be wanted for motor starting characteristic
Specific calibration is asked, while the operating pressure of fluid machinery and air demand can enable to meet institute according to engine demand type selecting
There is the requirement of diesel engine.
Auxiliary starter operation principle：
Under original state, gas distribution valve 2 and gas converging valve 5 are respectively positioned on position one, open air inlet 15 and increase through turbine
It is pressed into the first passage of the entrance charge air cooler 6 of tracheae 16 and closes air inlet 15 and enter charge air cooler 6 through additional mechanical supercharging air inlet pipe 17
Second channel, while low-pressure ratio large flow fluid machinery 3 does not work, after control unit 14 receives the starting-up signal of engine 8, point
Not Jie Shou coolant temperature sensor acquisition coolant temperature and barometric pressure sensor 12 acquire air inlet 15 at air
Pressure, when judging current coolant temperature less than desired temperature under current atmospheric pressure, control unit 14 is respectively to gas
Body flow divider 2 and gas converging valve 5 export auxiliary starter instruction, while referring to mechanical 3 output services of low-pressure ratio large flow fluid
It enables, gas distribution valve 2 and gas converging valve 5 are respectively positioned on position two at this time, and first passage is closed and second channel is opened, until hair
8 rotating speed of motivation reaches setting speed, and control unit 14 receives meeting after the tach signal from engine electronic control unit ECU
Automatically engine charge is switched to normal turbocharger 11 to charge air cooler route, i.e. gas distribution from start-up assist system
Valve 2, gas converging valve 5 and low-pressure ratio large flow fluid machinery 3 reset back original state, and all air inlets at this time all flow through turbine increasing
Depressor 11, into charge air cooler 6.
At the initial stage of starting, since engine speed is relatively low, unit interval air inflow demand is also smaller, at this time due to fluid machine
Tool is constantly supplied to charge air cooler 6, and it is more than setting value (such as 30kPa) that may make the air inlet overpressure after air pump, at this time fluid
Automatic pressure relief valve 4 after machinery is opened under the action of inside and outside differential pressure, and partial air is discharged by relief valve, until overpressure returns
To within setting value, automatic pressure relief valve 4 is closed later.
Gas distribution valve 2 and gas converging valve 5 become position two in assist cold start, from position one, and air is not at this time
It can let out from turbocharger 11.Similarly, gas distribution valve 2 and gas converging valve 5 after engine 8 starts successfully simultaneously
Position one is become from position two, closes the air inlet towards fluid machinery, the high pressure that turbine is formed when preventing engine 8 from working normally
Air leaks from gas converging valve 5, at automatic pressure relief valve 4.
A kind of diesel engine starting householder method realized using above-mentioned system suitable for high altitude localities, including following step
Suddenly：
1) atmospheric pressure at coolant temperature and air inlet 15 is acquired, and 8 intake method of engine is initially set to：It opens
Air inlet 15 enters the first passage of charge air cooler 6 through turbocharging air inlet pipe 16 and closes air inlet 15 through additional mechanical supercharging air inlet pipe
17 enter the second channel of charge air cooler 6；
2) current coolant temperature is judged whether less than the desired temperature under current atmospheric pressure, if so, executing step
It is rapid 3), if it is not, thening follow the steps 4)；
3) air inlet 15 is closed to enter the first passage of charge air cooler 6 through turbocharging air inlet pipe 16 and open the warp of air inlet 15
Additional mechanical supercharging air inlet pipe 17 enters the second channel of charge air cooler 6, and engine charge all flows through low-pressure ratio large flow fluid machinery
3, execute step 5)；
4) initial setting up for maintaining 8 intake method of engine, executes step 5)；
5) judge whether engine speed reaches setting speed, if so, engine 8 starts successfully, engine charge side
Formula is set as the mode of initial setting up, if it is not, then jump procedure 2).
In step 5), when engine 8 continuously judges that engine 8 is not up to setting speed under the mode of initial setting up
When number is more than setting number, then direct jump procedure 3), wherein setting number can be 2~3 times, this step can be effectively prevented from
The endless loop special circumstances of starting failure, further increase engine cold starting success rate under continuous initial setting up mode.
From diesel engine starting householder method the step of it is found that when environment temperature is higher than the temperature setting under current atmospheric pressure
When, by the control of control unit 14, the consumption to 13 electric energy of accumulator can be reduced with normal starting；When environment temperature is relatively low
When, control unit 14 starts engine 8 using auxiliary system automatically, shortens 8 starting time of engine, improves engine 8 and starts
Success rate makes air inlet flow through turbocharging when engine 8 starts successfully into the idling stage by the control of control unit 14
Device 11, and close fluid machinery.
Specifically, when key is screwed to " ON " shelves by driver, engine 8 powers on, and control unit 14 detects atmospheric pressure and passes
The Input2 signals of sensor 12 are compared with the atmospheric pressure-coolant temperature MAP to prestore, obtain under current atmospheric pressure
This limit value is compared minimum normal starting temperature limit with the coolant temperature Input3 signals detected, if cooling
Liquid temperature is less than limit value, then control unit 14 is gentle by gas distribution valve 2 respectively by Output1 signals and Output2 signals
Body converging valve 5 is placed in position two, and low-pressure ratio large flow fluid machinery 3 is started by Output3 signals.
In 8 starting process of engine, if control unit 14 detects engine, 8 rotating speed Input4 signals reach idling
Rotating speed, then control unit 14 gas distribution valve 2 and gas converging valve 5 are set respectively by Output1 signals and Output2 signals
In position one, pass through Output3 signal-off low-pressure ratio large flow fluids machinery 3.
If engine 8 is heat engine state when starting, control unit 14 receives Input3 signals, starting will not be used auxiliary
Auxiliary system.
In conclusion the present invention effectively overcomes various shortcoming in the prior art and has high industrial utilization,
Advantage of the present invention specifically includes：
1) prior art systems are complicated, install additional of high cost, while being changed to engine 8 larger, may increase engine 8
Failure rate.And more component is also required to many spaces and is arranged, on vehicle and mechanically moving, space is very limited,
Arrange that so many component has very big difficulty in practice.And present system is mainly organized as low-pressure ratio fluid machinery, control list
Member 14 and some valves, so occupied space very little, and it is light-weight, very little is changed to engine 8, has reduced dynamic auxiliary system to the greatest extent
The change united to former diesel engine, reduces cost, while can also reduce the probability of generation failure after installation start-up assist system, no
The stability and durability of engine 8 can be damaged；
2) in control mode, the application does not need measuring environment temperature, is sent out using engine coolant temperature as judgement
Whether engine start needs the major influence factors assisted, as long as engine coolant temperature is higher than setting value, even if environment temperature
Low (i.e. intake air temperature is low) is spent, will not be had a significant effect to motor starting characteristic.So measurement parameter of the present invention
It is few, the complexity of control is advantageously reduced, while will not have a negative impact to control strategy.
3) prior art needs individual electric high-pressure air pump to supplement high pressure gas, high pressure ratio air pump power consumption to gascollecting cap cylinder
Measure larger, and on vehicle and mechanically moving, electric energy is supplied by accumulator 13, limited energy.And the present invention is big using low-pressure ratio
Flow material machinery 3, since pressure ratio is relatively low, so high efficiency, the advantages of low energy consumption, even if simultaneously with diesel engine starting motor
Operation, accumulator electric-quantity also disclosure satisfy that.Low-pressure ratio fluid machinery flow is very big simultaneously, is fully able to meet heavy-duty machinery and vehicle
Large-scale diesel engine starting tonifying Qi demand.
4) when due to Different Altitude, atmospheric pressure difference is larger, so diesel engine starting performance also has very big difference, example
Such as, -40 DEG C of environment temperatures of 0m height above sea level and coolant temperature can be with the diesel engine of normal starting, -15 DEG C of temperature in 4500m height above sea level
It just can not normal starting under degree.The setting values such as temperature, pressure in prior art control strategy are all definite values, lack and are directed to
The starting control measure of altitude change.And in the control strategy of the present invention, for Different Altitude, there is the atmospheric pressure-to prestore cold
But liquid temperature MAP, i.e. coolant temperature setting value are changed with the variation of atmospheric pressure, the lower (height above sea level of atmospheric pressure
It is higher), coolant temperature setting value is also higher.The atmospheric pressure to prestore-coolant temperature MAP can be according to different money engines 8
Starting performance require demarcated.By this MAP, the application can accurately control and play dynamic auxiliary under all altitude conditions
System, has taken into account starting performance and accumulator electric-quantity saves two aspects.
Claims (9)
1. a kind of diesel engine starting auxiliary system suitable for high altitude localities is used for the starting of auxiliary diesel, the diesel oil
Machine includes air inlet, turbocharging air inlet pipe, charge air cooler and engine, which is characterized in that the system includes additional mechanical supercharging air inlet
Pipe, low-pressure ratio large flow fluid machinery, barometric pressure sensor, cooling-water temperature transmitter and control unit, the air inlet
The inlet end of the inlet end and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe is separately connected by gas distribution valve, it is cold in described
The inlet end of device is separately connected the outlet of the outlet side and additional mechanical supercharging air inlet pipe of turbocharging air inlet pipe by gas converging valve
End, the low-pressure ratio large flow fluid machinery are set in additional mechanical supercharging air inlet pipe, the outlet side of charge air cooler connection engine into
Gas end, the barometric pressure sensor are set on air inlet, and the cooling-water temperature transmitter is set in transmitter, the control
Unit is separately connected low-pressure ratio large flow fluid machinery, gas converging valve, gas distribution valve, barometric pressure sensor, coolant liquid
Temperature sensor and engine；
Under original state, gas distribution valve and gas converging valve open that air inlet enters charge air cooler through turbocharging air inlet pipe
One channel and closing air inlet enter the second channel of charge air cooler, while low-pressure ratio large flow fluid machine through additional mechanical supercharging air inlet pipe
Tool does not work, and after control unit receives the starting-up signal of engine, receives the coolant liquid temperature of coolant temperature sensor acquisition respectively
Atmospheric pressure at degree and the air inlet of barometric pressure sensor acquisition, when judging current coolant temperature less than current atmospheric pressure
When desired temperature under power, control unit is respectively to gas distribution valve and the output auxiliary starter instruction of gas converging valve, simultaneously
It is instructed to low-pressure ratio large flow fluid machinery output services, first passage is closed at this time and second channel is opened, until engine
Rotating speed reaches setting speed, and gas distribution valve, gas converging valve and low-pressure ratio large flow fluid mechanical return return original state.
2. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
The compression ratio value range of the low-pressure ratio large flow fluid machinery is 1.2-1.6.
3. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
The flow of the low-pressure ratio large flow fluid machinery is related with engine displacement and idling speed, meets following formula：
Q=0.036 × P × V
In formula, Q indicates flow, unit m3/ h, P indicate that engine displacement, unit L, V indicate idling speed, unit r/
min。
4. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
The low-pressure ratio large flow fluid machinery uses centrifugal-flow compressor, vortex pump or axial-flow compressor.
5. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
The low-pressure ratio large flow fluid machinery is worked by storage battery power supply.
6. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
Atmospheric pressure-coolant liquid of the desired temperature under different atmospheric pressures comprising current diesel engine is stored in described control unit
Temperature MAP chart, atmospheric pressure and coolant temperature in the atmospheric pressure-coolant temperature MAP chart meet following formula：
Tc=0.083Pa 2-1.897Pa+349.841
In formula, TcIndicate coolant temperature, unit K, PaIndicate atmospheric pressure, unit kPa.
7. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
The additional mechanical supercharging air inlet pipe is equipped with automatic pressure relief valve, and automatic pressure relief valve is more than fluid machine in additional mechanical supercharging air inlet overpressure
It is opened when tool maximum working pressure (MWP).
8. a kind of diesel engine starting auxiliary system suitable for high altitude localities according to claim 1, which is characterized in that
Air filter is equipped at the air inlet.
9. a kind of realizing that the diesel engine starting suitable for high altitude localities assists using claim 1-8 any one of them systems
Method, which is characterized in that include the following steps：
1) atmospheric pressure at coolant temperature and air inlet is acquired, and engine charge mode is initially set to：Open air inlet
Enter the first passage of charge air cooler through turbocharging air inlet pipe and close air inlet and enters charge air cooler through additional mechanical supercharging air inlet pipe
Second channel；
2) whether current coolant temperature is judged less than the desired temperature under current atmospheric pressure, if so, then follow the steps 3),
If it is not, thening follow the steps 4)；
3) close air inlet through turbocharging air inlet pipe enter charge air cooler first passage and open air inlet through additional mechanical supercharging into
Tracheae enters the second channel of charge air cooler, and engine charge all flows through low-pressure ratio large flow fluid machinery, executes step 5)；
4) initial setting up for maintaining engine charge mode, executes step 5)；
5) judge whether engine speed reaches setting speed, if so, engine start success, engine charge mode are arranged
For the mode of initial setting up, if it is not, then jump procedure 2).
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| DE102017213530A1 (en) * | 2017-08-03 | 2019-02-07 | Robert Bosch Gmbh | Low pressure sensor device and use of an inlet nozzle as a fluid inlet for a low pressure sensor device |
| CN109184971A (en) * | 2018-08-07 | 2019-01-11 | 马鞍山市兴隆铸造有限公司 | A kind of air inlet pipe of diesel engine |
| CN109252942B (en) * | 2018-11-08 | 2023-06-06 | 广西玉柴机器股份有限公司 | Electric auxiliary boost control method and system for engine |
| CN109404179A (en) * | 2018-12-10 | 2019-03-01 | 广西玉柴机器股份有限公司 | The plateau cold-start system of engine |
| CN109296447A (en) * | 2018-12-10 | 2019-02-01 | 广西玉柴机器股份有限公司 | The diesel engine that plateau power performance improves |
| CN109356713A (en) * | 2018-12-10 | 2019-02-19 | 广西玉柴机器股份有限公司 | The method for improving engine plateau cold-starting ability |
| CN109882325B (en) * | 2019-01-30 | 2020-04-17 | 上海沁辰机械设备有限公司 | Generating set oil feeding system suitable for plateau oxygen deficiency environment |
| CN109828525B (en) * | 2019-03-26 | 2023-12-08 | 中国人民解放军陆军军事交通学院镇江校区 | Ship host starting control system under ultra-high altitude condition |
| CN111520271B (en) * | 2020-04-22 | 2022-05-10 | 东风越野车有限公司 | Auxiliary starting control method for engine of off-road vehicle in highland and severe cold environment |
| CN112065597B (en) * | 2020-09-16 | 2023-05-23 | 潍柴动力股份有限公司 | Control method for air supplement of engine, engine system and control equipment |
| CN112632867B (en) * | 2020-12-21 | 2022-08-23 | 北京理工大学 | Design method and control method for minimum compression ratio of diesel engine |
| CN114684381B (en) * | 2022-03-29 | 2022-11-08 | 威海广泰空港设备股份有限公司 | High-altitude pressure automatic regulating system of aircraft ground air source unit |
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| US6029452A (en) * | 1995-11-15 | 2000-02-29 | Turbodyne Systems, Inc. | Charge air systems for four-cycle internal combustion engines |
| DE102007019060A1 (en) * | 2007-04-23 | 2008-11-20 | Audi Ag | Internal-combustion engine for motor vehicle, has mechanical loader arranged in intake system in parallel connection to compressor of turbocharger, and switched into upper speed range of engine to adjust power loss of turbocharger |
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