CN105179092B - A kind of methanol, biodiesel, diesel oil multifuel engine system control method - Google Patents
A kind of methanol, biodiesel, diesel oil multifuel engine system control method Download PDFInfo
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- CN105179092B CN105179092B CN201510711514.2A CN201510711514A CN105179092B CN 105179092 B CN105179092 B CN 105179092B CN 201510711514 A CN201510711514 A CN 201510711514A CN 105179092 B CN105179092 B CN 105179092B
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- biodiesel
- methanol
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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
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
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Abstract
The present invention relates to automobile, agricultural locomotive engine start technical field, particularly a kind of methanol, biodiesel, diesel oil multifuel engine system control method, comprises the following steps：A. methanol is loaded on diesel oil tank loaded on methanol fuel tank, biodiesel loaded on biodiesel fuel tank, diesel oil；B. methanol fuel tank, biodiesel fuel tank, diesel oil tank are controlled by same Electronic Control Unit ECU, and are independently supplied fuel, and its pattern is respectively methanol-driving pattern, biodiesel drive pattern or diesel driven pattern；C. diesel engine cold start-up；D. electronic control unit ECU preferentially carries out fault diagnosis；E. methanol fuel tank, the detection of biodiesel oil tank liquid level；F. coolant temperature detects；G. accelerator pedal match settings.The present invention solves the problems, such as that emission control is difficult, discharge is bad, oil consumption is higher, engine cisco unity malfunction under abnormal conditions after methanol, biodiesel and the lower cold start-up of diesel oil multifuel engine vehicle system control.
Description
Technical field
The present invention relates to automobile, agricultural locomotive engine start technical field, particularly a kind of methanol, biodiesel, bavin
Oily multifuel engine system control method.
Background technology
As energy crisis aggravation and Abgasgesetz are increasingly strict, exploitation New-type fuel has turned into the emphasis of engine research
One of.At present, on the basis of DID engine structure, fuel delivery parameters are not changed, research is gone to improve in terms of fuel quality
The combustion characteristics of diesel engine and discharge.On fuel is chosen：Tung oil, rapeseed oil, pure biodiesel fuel is configured,
Load-characteristic test is carried out on ZS195 diesel engines, have studied biodiesel fuel, ethanol and its diesel fuel mixing match to bavin
The influence of oil machine Combustion Release Heat and discharge performance.
Result of the test shows：Combustion characteristics and discharge performance of the fuel combination of different oil plants and different proportion to diesel engine
There is obvious influence.In small load condition point, biodiesel accounts for the fuel of large scale compared with 0# diesel oil, and combustion heat release is substantially stagnant
(1~4 DEG C of A) afterwards, delay period extend, and in-cylinder pressure and instantaneous exothermic heat rate peak value raise, and pressure rise is up to 5%, heat liberation rate, heat release rate peak
Value rise is showed more prominent after biodiesel fuel incorporation methanol up to 9%.As load increases, biodiesel fuel and its
The delay period of fuel combination be gradually shortened it is substantially suitable with diesel oil, the heat liberation rate, heat release rate peak value maximum range of decrease be 19%, pressure curve with
Diesel oil is substantially suitable.
The cold starting performance that biodiesel fuel accounts for the fuel of large scale is poor, but can meet dynamic property requirement, economy
Slightly reduce, fuel consumption is higher by 12~18% in declared working condition than diesel oil.In terms of discharge：Use biodiesel fuel
When, NOx emission about reduces by 10%, and biodiesel fuel, which is accounted in the fuel of large scale, has blended ethanol, the NOx rows of fuel combination
Put reduction by 15%.At declared working condition (8.8kW/2000rpm), the soot emissions that biodiesel fuel accounts for the fuel of large scale all compare
Diesel oil reduces, the biggest drop 89%.The fuel that biodiesel fuel accounts for small scale is in declared working condition point, the NOx maximum ranges of decrease
8.8%, the soot emissions maximum range of decrease is 76%.
It can be seen that the fuel combination of biodiesel fuel, methanol and its diesel fuel can meet engine power performance and economy
Property require, and good in middle high load working condition combustion characteristics, engine operates steadily, and can effectively reduce the main row of diesel engine
Put:NOx and soot, the fuel whole structure that bio-fuel accounts for large scale are best.So methanol, biodiesel, diesel oil are fired more
Material engine system control method research highlights its importance.
The content of the invention
The invention provides a kind of methanol, biodiesel, diesel oil multifuel engine system control method, it is therefore an objective to solves
And the vehicle of assembling polyhybird engine fuel whard to control to polyhybird engine fuel fuel supply under currently available technology
Emission control is difficult after cold start-up, discharge is bad, oil consumption is higher, engine under abnormal conditions occurs in the supply of certain fuel can not be normal
The pattern switching problem of work.
The purpose of the present invention is achieved through the following technical solutions：
A kind of methanol, biodiesel, diesel oil multifuel engine system control method, comprise the following steps：
A. methanol is loaded on diesel oil tank loaded on methanol fuel tank 101, biodiesel loaded on biodiesel fuel tank 102, diesel oil
103；
B. methanol fuel tank 101, biodiesel fuel tank 102, diesel oil tank 103 are controlled by same Electronic Control Unit ECU
System, and fuel is independently supplied, its pattern is respectively methanol-driving pattern, biodiesel drive pattern or diesel driven pattern；
D. diesel engine cold start-up；
D. electronic control unit ECU preferentially carries out fault diagnosis, when methanol liquid level sensor 107, biodiesel liquid level pass
During 108 either component failure signal of sensor, electronic control unit ECU will be switched to diesel fuel mode driving diesel engine
Work, is simultaneously emitted by fault diagnosis alarm signal, and notice human pilot repairs failure in time；
E. methanol fuel tank, the detection of biodiesel oil tank liquid level
When detecting that methanol fuel liquid level is less than preset value, methanol liquid level sensor 110 sends liquid level signal
To electronic control unit ECU, electronic control unit ECU is handled according to the liquid level signal and is sent result and instructed to holding
Row mechanism, now diesel engine 104 keeps diesel driven pattern, while starts to alarm, and prompts driver behavior personnel to mend in time
Fill methanol fuel；
Further, when detecting that biodiesel fuel liquid level is less than preset value, biodiesel liquid level sensor
117 send liquid level signal to electronic control unit ECU, and electronic control unit ECU according to the liquid level signal handle concurrent
Result is sent to instruct to executing agency, now diesel engine keeps diesel driven pattern, while starts to alarm, and prompts to drive
Operating personnel supplement biodiesel fuel in time；
F. coolant temperature detects
If methanol fuel liquid level and biodiesel fuel liquid level are higher than setting value, electronic control unit ECU carries out cold
But liquid temperature detection, coolant temperature do coolant temperature according to accelerator pedal position in engine electronic control unit ECU
With mark timing setting, and electronic control unit ECU is inputted, meanwhile, biodiesel accelerator pedal position is set during matching and calibration, and
Electronic control unit ECU is inputted, under the conditions of cold, diesel engine temperature is generally with diesel engine coolant temperature gauge
Show, ECT is detected by cooling-water temperature transmitter 105, and coolant temperature signal 114 is sent into electronics
Control unit ECU, when the coolant temperature detected is less than setting value, result is instructed and sent out by electronic control unit ECU
Executing agency is delivered to, engine system keeps diesel driven pattern, when the coolant temperature detected is higher than setting value, electronics
Control unit ECU determines whether time since engine start；
G. accelerator pedal match settings
When electronic control unit ECU does matching and calibration, coolant temperature setting value is respectively set as 20 DEG C, 40 DEG C, 60 DEG C,
It is now less than 20%, 40% to 60% and corresponding more than 60% with accelerator pedal position respectively；The diesel oil of diesel engine 104
After drive pattern cold start-up, when cooling-water temperature transmitter 105 detects coolant temperature<20 DEG C, corresponding accelerator pedal position
Put, when being less than 20% underload system, be switched to biodiesel drive pattern；When cooling-water temperature transmitter detects temperature
Degree>At 40 DEG C, when corresponding accelerator pedal position is 40% to 60% medium-loaded system, methanol-driving pattern is switched to；
When cooling-water temperature transmitter detection temperature>60 DEG C, corresponding accelerator pedal position is greater than 60% heavy loaded system, this
When be switched to diesel driven pattern to drive diesel engine.
In step e, methanol fuel level set value is height H >=15mm, if liquid level H<15mm, then methanol combustion
Expect surplus deficiency, now electronic control unit ECU judges according to methanol liquid level signal 110 and handled and send result
To command execution unit, diesel engine switches to diesel driven pattern, is simultaneously emitted by alarming, alerting drivers supplement first in time
Alcohol ate, further, biodiesel fuel level set value are height H >=15mm, if liquid level H<15mm, then it is biological
Diesel fuel surplus deficiency, now electronic control unit ECU judges and handled simultaneously according to biodiesel liquid level signal 117
Result is sent to command execution unit, diesel engine switches to diesel driven pattern, is simultaneously emitted by alarming, alerting drivers
Corresponding fuel is supplemented in time.
The beneficial effects of the present invention are：
The multifuel engine system control method of the present invention is controlled by same electronic control unit ECU, and engine is low
Cold start-up is carried out with diesel oil under temperature, when coolant temperature and engine run time reach setting value, switching in good time is corresponding to supply
Oily pattern is driven；When engine runs appearance exception, progress fuel mode switches and sends alarm signal in time automatically.Mesh
Preceding existing technology is mainly fuel combination fuel system and double supply modes, and the present invention uses more fuel tank independent oil supply sides
Formula, synthesis solve formation microemulsion fuel combination under fuel combination fuel system and match whard to control and multifuel engine car
Emission control is difficult, discharge is bad, oil consumption is higher, engine cisco unity malfunction under abnormal conditions after the lower cold start-up of type system control
The problem of.It is experimentally confirmed, two circulation THC (total amount containing hydrocarbon in the gas of discharge) more former sides of total release
Case can reduce by 38% and 47% respectively, and system overall permanence is good, and its method is easily achieved.
Brief description of the drawings
Fig. 1：Methanol, biodiesel, diesel oil multifuel engine system feedway structure chart
Fig. 2：Electronic control unit ECU control principle drawings
Fig. 3：Methanol, biodiesel, diesel oil multifuel engine system control method flow chart.
Reference：
The biodiesel fuel tank of 101 methanol fuel tank 102
The diesel engine of 103 diesel oil tank 104
The electronic control unit ECU of 105 cooling-water temperature transmitter 106
The biodiesel liquid level sensor of 107 methanol liquid level sensor 108
The methanol liquid level signal of 109 diesel oil liquid level sensor 110
The methanol fuel output control signal of 111 methanol fuel tank failure diagnostic signal 112
113 methanol fuels export 114 coolant temperature signals
The biodiesel fuel of 115 biodiesel fuel output control signal 116 exports
The biodiesel fuel oil box fault diagnosis signal of 117 biodiesel liquid level signal 118
The diesel fuel of 119 diesel oil output control signal 120 exports
The diesel fuel fuel tank failure diagnostic signal of 121 diesel oil liquid level signal 122
Embodiment
It is with reference to the accompanying drawings and examples, specific to the present invention to make the purpose of the present invention, content and advantage clearer
Embodiment is further described in detail.Following examples are used to illustrate the present invention, but are not limited to the scope of the present invention.
First, methanol of the present invention, biodiesel, diesel oil multifuel engine system feedway structure are illustrated referring to Fig. 1
Figure.
Methanol fuel tank 101, biodiesel fuel tank 102, diesel oil tank 103 are laid independently of each other on apparatus structure, and it fires
Material supply is controlled by same electronic control unit ECU 106, and electronic control unit ECU 106 is multi fuel apparatus for controlling of supply
Core, the data controlling signal that analysis is sent with handling each sensor, while corresponding analysis judgement is made, and object command is sent out
Executing agency is delivered to, realizes the supply control to multiple fuel system.
Sensor includes methanol liquid level sensor 107, biodiesel liquid level sensor 108, diesel oil liquid level sensor 109.
Methanol liquid level sensor 107 is arranged in methanol fuel tank 101, and biodiesel liquid level sensor 108 is arranged in biodiesel fuel tank
In 102, diesel oil liquid level sensor 109 is arranged in diesel oil tank 103.
Data message includes methanol liquid level signal 110, methanol fuel tank failure diagnostic signal 111, methanol combustion with data signal
Expect output control signal 112, coolant temperature signal 114, biodiesel fuel output control signal 115, biodiesel liquid level
Signal 117, biodiesel fuel oil box fault diagnosis signal 118, diesel oil output control signal 119, the He of diesel oil liquid level signal 121
Diesel fuel fuel tank failure diagnostic signal 122.Data message includes data signal and analog signal with data signal.
Fuel level signal includes methanol liquid level signal 110, biodiesel liquid level signal 117 and diesel oil liquid level signal 121.
Methanol liquid level signal 110 is provided by methanol fuel liquid level sensor 107, and biodiesel liquid level signal 117 is by biodiesel fuel
Liquid level sensor 108 is provided, and diesel oil liquid level signal 121 is provided by diesel fuel liquid level sensor 109, and level set value is marked in advance
Determine and input electronic control unit ECU.
Fuel tank fault diagnosis signal includes methanol fuel tank failure diagnostic signal 111, biodiesel fuel oil case failure
Diagnostic signal 118, diesel fuel fuel tank failure diagnostic signal 122.
As shown in Fig. 2 it is electronic control unit ECU control principle drawings.
Described data message inputs the electronic control unit ECU with data signal by input circuit, and simulation is believed
Number binary digital signal conversion is carried out, data signal after conversion inputs CPU by I/O and carries out Floating-point Computation and processing, together
When carry out caching process on a memory, its data signal on single-chip microcomputer/microprocessor by processing, obtain object command letter
Number and by I/O ports to output loop, object command signal is sent to executing agency's execute instruction, so as to realize to fuel
The control of supply.
Because methanol fuel and biodiesel fuel are not easy to cold start-up at low temperature, so under prior art license,
Using diesel fuel cold start mode, the problem of to avoid methanol fuel under low-temperature condition, biodiesel fuel difficulty in starting.
After engine start success, biodiesel drive pattern is switched to when accelerator pedal position is less than 20% underload,
System is switched to methanol-driving pattern during middle load when accelerator pedal position is 40% to 60%, when accelerator pedal position is big
Diesel driven pattern is switched to drive engine during heavy loaded system when 60%.In addition, when diesel engine starts,
Switch supply model in real time with reference to detection coolant temperature.
Fig. 3 is a kind of methanol of the present invention, biodiesel, the flow chart of diesel oil multifuel engine system control method.One
Kind methanol, biodiesel, diesel oil multifuel engine system control method, comprise the following steps：
A. methanol is loaded on diesel oil tank loaded on methanol fuel tank 101, biodiesel loaded on biodiesel fuel tank 102, diesel oil
103；
B. methanol fuel tank 101, biodiesel fuel tank 102, diesel oil tank 103 are carried out by same electronic control unit ECU
Control, and fuel is independently supplied, its pattern is respectively methanol-driving pattern, biodiesel drive pattern or diesel driven pattern；
C. diesel engine cold start-up；
D. electronic control unit ECU preferentially carries out fault diagnosis, when methanol liquid level sensor 107 or biodiesel liquid level pass
During 108 failure signal of sensor, electronic control unit ECU will be switched to diesel driven mode activated diesel engine work
Make, be simultaneously emitted by fault diagnosis alarm signal, notice human pilot repairs failure in time；
E. methanol fuel tank, the detection of biodiesel oil tank liquid level
When detecting that methanol fuel liquid level is less than preset value, methanol liquid level sensor 107 sends liquid level signal
To electronic control unit ECU, electronic control unit ECU is handled according to the liquid level signal and is sent result and instructed to holding
Row mechanism, now diesel engine 104 keeps diesel driven pattern, while starts to alarm, and prompts driver behavior personnel to mend in time
Fill methanol fuel.
Further, when detecting that biodiesel fuel liquid level is less than preset value, biodiesel liquid level sensor
108 send liquid level signal to electronic control unit ECU, and electronic control unit ECU according to the liquid level signal handle concurrent
Result is sent to instruct to executing agency, now diesel engine keeps diesel driven pattern, while starts to alarm, and prompts to drive
Operating personnel supplement biodiesel fuel in time.
Such as：Normal supply methanol fuel level set value is height H >=15mm, if liquid level H<15mm, then first
Alcohol ate surplus deficiency, diesel engine cisco unity malfunction will be caused by reusing methanol fuel driving diesel engine 104,
Now electronic control unit ECU judges according to methanol liquid level signal 110 and is handled and send result to instruction execution machine
Structure, diesel engine switch to diesel driven pattern, are simultaneously emitted by alarming, alerting drivers supplement methanol fuel in time.Enter one
Step ground, normal supply biodiesel fuel level set value is height H >=15mm, if liquid level H<15mm, then biological bavin
Oil fuel surplus deficiency, reusing biodiesel fuel driving diesel engine will cause diesel engine can not normal work
Make, now electronic control unit ECU judges according to biodiesel liquid level signal 117 and handled and send result to instruction
Executing agency, diesel engine switch to diesel driven pattern, are simultaneously emitted by alarming, the alerting drivers corresponding combustion of supplement in time
Material.
F. coolant temperature detects
If the fuel level of methanol and biodiesel is higher than setting value, electronic control unit ECU carries out cooling liquid temperature
Degree detection.Coolant temperature does coolant temperature matching and calibration according to accelerator pedal position in engine electronic control unit ECU
When set, and input electronic control unit ECU.Meanwhile biodiesel accelerator pedal position is set during matching and calibration, and input electricity
Sub-control unit ECU.Under the conditions of cold, diesel engine temperature is generally represented with diesel engine coolant temperature, hair
Motivation coolant temperature is detected by cooling-water temperature transmitter 105, and coolant temperature signal 114 is sent into Electronic Control list
First ECU.When the coolant temperature detected is less than setting value, electronic control unit ECU sends result instruction to holding
Row mechanism, diesel engine keep diesel driven pattern.When the coolant temperature detected is higher than setting value, Electronic Control list
First ECU determines whether that diesel engine starts the time.
G. accelerator pedal match settings
When electronic control unit ECU does matching and calibration, coolant temperature setting value is respectively set as 20 DEG C, 40 DEG C, 60 DEG C,
It is now less than 20%, 40% to 60% and corresponding more than 60% with accelerator pedal position respectively.The bavin of diesel engine 104
After oily drive pattern cold start-up, when cooling-water temperature transmitter 105 detects coolant temperature<20 DEG C, corresponding accelerator pedal
When position is then less than 20% underload system, biodiesel drive pattern is switched to；When cooling-water temperature transmitter detects
Temperature>At 40 DEG C, when corresponding accelerator pedal position is 40% to 60% medium-loaded system, methanol-driving mould is switched to
Formula；When cooling-water temperature transmitter detection temperature>60 DEG C, corresponding accelerator pedal position is greater than 60% high load capacity system
System, is now switched to diesel driven pattern to drive diesel engine.
It should be noted that after diesel engine 104 successfully starts up, although coolant temperature respectively reaches setting value,
It is not meant to that diesel engine integrally reaches optimal warming-up effect, because warming-up is a progressive process, can just makes bavin
Oil turbine all parts reach certain temperature, and coolant temperature and each part of diesel engine such as cylinder temperature are not
It is completely the same, now if system is switched into biodiesel drive pattern or methanol-driving pattern, fuel certainly will be caused not
Fully burning, while of short duration diesel fuel mode starts the time so that the oil film that diesel injection is formed is limited, and biodiesel and first
Alcohol ate does not possess perfect lubrication characteristic again, if switching biodiesel drive pattern or methanol-driving pattern immediately can all increase
Abrasion to diesel engine, so that shorten the life-span of diesel engine.
Since successfully starting up diesel engine 104, with the operating of diesel engine 104, diesel engine temperature by
Gradually rise, ascending temperature is related to starting time, initial coolant temperature and accelerator pedal position.Specifically, in diesel engine
During 104 matching and calibration of machine, according to different initial coolant temperature values, corresponding accelerator pedal position and time setting are calibrated
Value, since successfully starting up diesel engine, behind setting position and time value, diesel engine is integrally up to good
Warming-up effect, diesel engine casing wall oil film thickness is sufficient, is exactly now the best opportunity for switching corresponding fuel.
Such as：When diesel engine does matching and calibration, initial 10 DEG C of coolant temperature, corresponding diesel engine warming-up
Time is 120S, then when it is 10 DEG C that engine coolant sensor 105, which detects initial coolant temperature, electronic control unit
It is 120S that ECU, which selectes diesel engine warm-up period, is calculated since successfully starting up diesel engine, in detection engine cool
When liquid temperature degree reaches setting value, and diesel engine, after 120S is operated, diesel engine closes diesel oil initial start mould
Formula, electronic control unit ECU is according to determining whether to be switched to corresponding biodiesel drive pattern or methanol-driving pattern.
Embodiments of the invention are the foregoing is only, not thereby limit the practical range of the present invention, it is every to utilize this hair
The equivalent structure or equivalent flow conversion that bright specification and accompanying drawing content are made, or directly or indirectly using in other correlation techniques
Field, it is included within the scope of the present invention.
Claims (2)
1. a kind of methanol, biodiesel, diesel oil multifuel engine system control method, it is characterised in that：Comprise the following steps：
A. methanol is loaded on diesel oil tank loaded on methanol fuel tank (101), biodiesel loaded on biodiesel fuel tank (102), diesel oil
(103)；
B. methanol fuel tank (101), biodiesel fuel tank (102), diesel oil tank (103) are carried out by same Electronic Control Unit ECU
Control, and fuel is independently supplied, its pattern is respectively methanol-driving pattern, biodiesel drive pattern or diesel driven pattern；
C. diesel engine cold start-up；
D. electronic control unit ECU preferentially carries out fault diagnosis, when methanol liquid level sensor (107), biodiesel level sensing
During device (108) either component failure signal, electronic control unit ECU will be switched to diesel fuel mode driving diesel engine
Work, is simultaneously emitted by fault diagnosis alarm signal, and notice human pilot repairs failure in time；
E. methanol fuel tank, the detection of biodiesel oil tank liquid level
When detecting that methanol fuel liquid level is less than preset value, methanol liquid level sensor (110) by liquid level signal send to
Electronic control unit ECU, electronic control unit ECU are handled according to the liquid level signal and are sent result and instructed to execution
Mechanism, now diesel engine (104) keeps diesel driven pattern, while starts to alarm, and prompts driver behavior personnel to mend in time
Fill methanol fuel；
Further, when detecting that biodiesel fuel liquid level is less than preset value, biodiesel liquid level sensor (117)
Liquid level signal is sent to electronic control unit ECU, electronic control unit ECU is handled according to the liquid level signal and sent place
Object command is managed to executing agency, now diesel engine keeps diesel driven pattern, while starts to alarm, and prompts driver behavior
Personnel supplement biodiesel fuel in time；
F. coolant temperature detects
If methanol fuel liquid level and biodiesel fuel liquid level are higher than setting value, electronic control unit ECU carries out coolant
Temperature detection, coolant temperature do coolant temperature matching mark according to accelerator pedal position in engine electronic control unit ECU
Timing setting, and input electronic control unit ECU, meanwhile, biodiesel accelerator pedal position is set during matching and calibration, and is inputted
Electronic control unit ECU, under the conditions of cold, diesel engine temperature is generally represented with diesel engine coolant temperature,
ECT is detected by cooling-water temperature transmitter (105), and coolant temperature signal (114) is sent into electronics
Control unit ECU, when the coolant temperature detected is less than setting value, result is instructed and sent out by electronic control unit ECU
Executing agency is delivered to, engine system keeps diesel driven pattern, when the coolant temperature detected is higher than setting value, electronics
Control unit ECU determines whether time since engine start；
G. accelerator pedal match settings
When electronic control unit ECU does matching and calibration, coolant temperature setting value is respectively set as 20 DEG C, 40 DEG C, 60 DEG C, now
It is less than 20%, 40% to 60% and corresponding more than 60% with accelerator pedal position respectively；Diesel engine（ 104）Diesel oil
After drive pattern cold start-up, when cooling-water temperature transmitter (105) detects coolant temperature<20 DEG C, corresponding accelerator pedal
When position is then less than 20% underload system, biodiesel drive pattern is switched to；When cooling-water temperature transmitter detects
Temperature>At 40 DEG C, when corresponding accelerator pedal position is 40% to 60% medium-loaded system, methanol-driving mould is switched to
Formula；When cooling-water temperature transmitter detection temperature>60 DEG C, corresponding accelerator pedal position is greater than 60% high load capacity system
System, is now switched to diesel driven pattern to drive diesel engine.
2. methanol as claimed in claim 1, biodiesel, diesel oil multifuel engine system control method, it is characterised in that：
In step e, methanol fuel level set value is height H >=15mm, if liquid level H<15mm, then methanol fuel remain
Surplus deficiency, now electronic control unit ECU according to methanol liquid level signal (110) judge and handled and by result send to
Command execution unit, diesel engine switch to diesel driven pattern, are simultaneously emitted by alarming, alerting drivers supplement methanol in time
Fuel, further, biodiesel fuel level set value are height H >=15mm, if liquid level H<15mm, then biological bavin
Oil fuel surplus is insufficient, and now electronic control unit ECU judges and handled simultaneously according to biodiesel liquid level signal (117)
Result is sent to command execution unit, diesel engine switches to diesel driven pattern, is simultaneously emitted by alarming, alerting drivers
Corresponding fuel is supplemented in time.
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| CN105587409A (en) * | 2016-03-16 | 2016-05-18 | 李珍发 | Switching system for denatured methanol diesel fuel and general diesel fuel dual-fuel supplying |
| CN107620646A (en) * | 2017-08-10 | 2018-01-23 | 北汽福田汽车股份有限公司 | Dual-purpose fuel vehicle and control method for dual-purpose fuel vehicle, device |
| CN113339153B (en) * | 2021-07-16 | 2023-06-09 | 无锡威孚高科技集团股份有限公司 | Control method and device of methanol diesel dual-fuel high-pressure direct injection system |
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| CN101984234A (en) * | 2010-11-11 | 2011-03-09 | 东莞传动电喷科技有限公司 | Control method of methanol/gasoline dual-fuel engine system |
| CN104832297B (en) * | 2014-11-12 | 2017-06-06 | 北汽福田汽车股份有限公司 | Double fuel switching control, system, method and vehicle |
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