CN103993965B - A kind of LPG/CNG Double-fuels EFI control method - Google Patents
A kind of LPG/CNG Double-fuels EFI control method Download PDFInfo
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- CN103993965B CN103993965B CN201310051811.XA CN201310051811A CN103993965B CN 103993965 B CN103993965 B CN 103993965B CN 201310051811 A CN201310051811 A CN 201310051811A CN 103993965 B CN103993965 B CN 103993965B
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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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Abstract
The invention discloses a kind of LPG/CNG Double-fuels EFI control method, comprise the following steps：Step one, the data sampled according to differential pressure pickup or pressure sensor calculate the pressure value in gas storage cylinder；Step 2, water temperature in water tank is calculated according to the data of cooling-water temperature sensor；Step 3, by the temperature value of the pressure value of step one and step 2 respectively with setting threshold value to be compared, fuel oil is carried out to fuel gas alternative when the former is higher than setting threshold value and engine speed is higher than setting threshold values.The present invention is automatically brought to fuel states by the accurate sampling to differential pressure pickup signal and pressure sensor signal and comprehensive analysis processing after gaseous-pressure is less than setting value.Intelligent Recognition is carried out to differential pressure pickup, pressure sensor, tach signal, cooling-water temperature sensor, gas injection valve signal, former car fuel injection signal etc., abnormal signal is automatically processed in exception on the effect of system but does not influence combustion gas to work, moreover it is possible to which pressure gas is realized in artificial operation when abnormal.
Description
Technical field
The present invention relates to automobile electronic fuel oil jet control technology, and in particular to a kind of LPG/CNG Double-fuels EFI control method.
Background technology
LPG/CNG fuel electric injection system includes preceding dress and afterloading system, now general exemplified by later dress is oil to gas system
Include single point injection and multipoint injection system all over the modifying system used, all by former car atomizer circuitry cuts, and gather former car
Each sensor signal of the signal of atomizer and former car is calculated by certain algorithm carries out jet after jet signal.Fuel oil and combustion gas,
Driver can be with free switching.It is divided to two classes in existing oil to gas system, a class is the LPG/CNG with differential pressure pickup technology
Fuel electric injection system, the system for having differential pressure pickup can not only analyze steel cylinder air pressure, moreover it is possible to analyze the load of engine.One class
It is the system of no differential pressure pickup technology.The common system for having differential pressure pickup, once differential pressure pickup is damaged, or rotating speed letter
Vehicle can not just commonly use gas during number exception.
Present oil to gas system, when tach signal exception or abnormal differential pressure pickup, can not just commonly use gas work,
Even result in flame-out, such system has potential safety hazard；Existing system does not possess the pressure gas in sensor abnormality simultaneously
Function.During being travelled with fuel oil, computer board is combined according to the fired state of each sensor signal analysis engine
Former car ECU control injection pulse width analysis, jet amount control when going to control combustion gas.Deficiency is that system can not be automatic after oil to gas
Regulation, does not reach the optimum efficiency of combustion gas.
The content of the invention
In order to solve the deficiencies in the prior art, the invention provides a kind of LPG/CNG Double-fuels EFI control method.
The technical scheme is that：A kind of LPG/CNG Double-fuels EFI control method, comprises the following steps：Step
Rapid one, calculated according to the data that the differential pressure pickup or pressure sensor being arranged in gas storage cylinder are sampled in gas storage cylinder
Pressure value；Step 2, water temperature in water tank is calculated according to the data of cooling-water temperature sensor；Step 3, by the pressure of step one
The temperature value of value and step 2 is respectively with setting threshold value to be compared, when the former turns higher than progress fuel oil when setting threshold value to combustion gas
Change.
Further improvement of the present invention includes：
The water temperature threshold value is 0~90 degree of setting range.
Preferably 30 degree of the water temperature threshold value.
During the abnormality of temperature sensors, the basis for estimation that water temperature turns combustion gas as fuel oil is released, but engine is turned
Speed is included in basis for estimation, and when gas storage cylinder pressure is met, fuel oil turns combustion gas and engine speed also reaches vehicle when setting threshold value
Switch to combustion gas.
The engine rotational speed signal is derived from engine cam axle sensor or ignition coil or atomizer.
When gas storage cylinder air pressure is less than given threshold, system may be selected shielding fuel oil and turn combustion gas judgement, be forced into combustion
Gaseity.
The threshold value setting range of the differential pressure pickup or pressure sensor is 1~3Mpa.
Under combustion gas state, when the gas storage cylinder pressure is less than given threshold, combustion gas is switched into fuel oil.
The step 3, rapid one pressure value and the temperature value of step 2 are respectively with setting threshold value to be compared, when the former
Fuel oil is carried out to fuel gas alternative higher than when setting threshold value and engine speed higher than setting threshold values.
The present invention by the accurate sampling to differential pressure pickup signal and pressure sensor signal and comprehensive analysis processing,
Gaseous-pressure is automatically brought to fuel states after being less than setting value.And to differential pressure pickup, pressure sensor, tach signal, water temperature
Sensor, gas injection valve signal, former car fuel injection signal etc. carry out Intelligent Recognition, and prompting can be automatically analyzed in exception, automatic place
Abnormal signal is managed on the effect of system but does not influence combustion gas to work, moreover it is possible to which pressure gas is realized in artificial operation when abnormal.Overcome
The problem of fuel oil causes flame-out can not be gone to during the exception of existing system, it is ensured that the security of driving.
Brief description of the drawings
Fig. 1 is control flow chart of the present invention.
Embodiment
The present invention is elaborated below in conjunction with the accompanying drawings.
A kind of LPG/CNG Double-fuels EFI control method of the present invention, comprises the following steps：Step one, according to pressure difference
Sensor or the data of pressure sensor sampling calculate the pressure value in gas storage cylinder；Step 2, according to cooling-water temperature sensor
Data calculate water temperature in water tank；Step 3, by the temperature value of the pressure value of step one and step 2 respectively with setting threshold
Value is compared, and fuel oil is carried out to fuel gas alternative when the former is higher than setting threshold value.The water temperature threshold value is 0~90 degree.
Preferably 30 degree of the water temperature threshold value.During the abnormality of temperature sensors, release water temperature as fuel oil turn the judgement of combustion gas according to
According to, but engine speed is included in basis for estimation, turn combustion gas and engine speed when gas storage cylinder pressure meets fuel oil
Vehicle switchs to combustion gas when reaching setting threshold value.The engine rotational speed signal is derived from engine cam axle sensor or ignition coil
Or atomizer.When gas storage cylinder air pressure is less than given threshold, system may be selected shielding fuel oil and turn combustion gas judgement, be forced into combustion
Gaseity.The threshold value setting range of the differential pressure pickup or pressure sensor is 1~3Mpa, when differential pressure pickup failure certainly
It is dynamic to switch to pressure sensor threshold values to judge.Under combustion gas state but optional use gas, the gas storage cylinder pressure is less than setting
During threshold value, combustion gas is switched into fuel oil.
The step 3, rapid one pressure value and the temperature value of step 2 are respectively with setting threshold value to be compared, when the former
Fuel oil is carried out to fuel gas alternative higher than when setting threshold value and engine speed higher than setting threshold values.
In order to reduce influence of the sensor fault to system operation and traffic safety, this invention takes intellectual analysis and place
The design method of reason.By the analysis to differential pressure pickup, by MCU calculate after be scaled the pressure of combustion gas in correspondence steel cylinder, one
Data transfer to switch is shown that tolerance is for reference by aspect by RS232 serial ports, on the other hand can spirit by debugging software
Setting pressure low limit living, when pressure is less than lower bound, control goes to fuel states in time.If differential pressure pickup is abnormal, automatically
Release the calculating of pressure difference amendment, and by sampled pressure sensor 0-5V analog signal, by MCU calculate after be scaled correspondence steel
The pressure of combustion gas, then does above-mentioned control process, fuel oil can not be gone to when overcoming the exception of existing system to be caused to put out in bottle
Fiery the problem of, it is ensured that the security of driving.The voltage that pressure sensor is output to ECU is 0~4.5V, correspondence steel cylinder air pressure：
0-20MPa differential pressure pickups or pressure sensor minimum pressure setting range：1~3Mpa, when ECU is detected less than setting air pressure
During corresponding voltage, fuel oil is switched to.
To water temperature signal sample, reach can set temperature when just combustion gas state is gone to by fuel oil, it is ensured that conversion it is steady
Property；Cool car turns after gas, and program, which has, gives tolerance zero offset capability, makes to be in optimal shape all the time to tolerance during vehicle gas
State.Once but cooling-water temperature sensor is abnormal, other systems can not just go to combustion gas and work, and the present invention passes through small switch indication light
Quick flashing prompting, while water temperature is released as the condition for turning gas, but analysis vehicle turns gas automatically after accelerating, and solves because of one
The problem of causing that just gas can not be commonly used during the sensor fault of individual very little.
To giving tolerance control under different load, on the one hand according to the collection of former car ECU Injection Control and various sensors
Sampled signal calculate data, two curve comparisons adjustment can be also drawn to fuel oil and combustion gas by debugging software and are set, with up to
To more preferable effect；On the other hand there are the rotating speed debugging functions and acceleration debugging functions under high and low load.
The present invention also by the fuel injection signal and jet signal progress self-diagnosis to each cylinder of automobile, can accurately analyze event
Which cylinder barrier point derives from, and is shown on the interface of debugging software；It is such as faulty to each biosensor analysis, it is soft
The font of corresponding sensor name can become red flicker to point out to operate commissioning staff on part interface, instead of manual analysis
The trouble of trouble point, substantially increases debugging efficiency.
The processing originated for tach signal, existing system only supports the number of winning the confidence on ignition coil, the present invention not only from
The number of winning the confidence on ignition coil, the number of winning the confidence also on camshaft is greatly improved the antijamming capability of system, because big portion on automobile
Divide interference from the high pressure of ignition system generation or the electric leakage of cylinder line., can be automatic if the above two all do not have abnormal signal
The signal of change rotating speed on atomizer is taken, system is improved to the adaptability of different automobile types and reduces to speed probe
Dependence.The signal of camshaft is the square-wave pulse of standard, is not almost interfered with, and removing standard by coefficient 2~16 during calculating turns
Fast (rev/min), wherein 2~16 can set, different automobiles, the number of teeth of camshaft-signal sensor is different, just right
Answer 2~16 coefficient.
Tach signal is used for judging the running status of automobile, e.g. idling or middling speed or high speed, or stops working and (need
Cut off source of the gas, it is ensured that safety).And system needs the different amendments for carrying out tolerance according to rotating speed.
The present invention has also taken into full account the complex situations of practical application, such as in-car fuel tank does not have oil, and tach signal does not have
Or damage, temperature signal is abnormal etc., existing system works with regard to unrenewable combustion gas.Operation of the driver to button, if
Long-press pressure more than 3 seconds, then into emergency rating, after ECU is detected, then no longer analyzes the shape of each sensor with gas button
State and the condition automatic shield for being converted to fuel oil, are started with gas or run automobile, can now force to be called a taxi or travelled with gas all the time,
Its practicality is greatly reinforced.
As shown in figure 1, the 1, data for each sensor of sampling and calculating；2nd, if pressure gaseity then unconditionally turns
For combustion gas, then switch to fuel oil when otherwise pressure is less than setting value or snifting valve failure.3rd, when pressure is higher than setting value, water temperature is higher than
Set and engine speed is higher than setting value, then switch to combustion gas；4th, when pressure is higher than setting value, if cooling-water temperature sensor is abnormal,
Then only judge that engine speed is higher than setting value, then switch to combustion gas.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of LPG/CNG Double-fuels EFI control method, it is characterised in that comprise the following steps：
Step one, the data sampled according to differential pressure pickup or pressure sensor calculate the pressure value in gas storage cylinder；
Step 2, water temperature in water tank is calculated according to the data of cooling-water temperature sensor；
Step 3, by the temperature value of the pressure value of step one and step 2 respectively with setting threshold value to be compared, when the former is higher than
Fuel oil is carried out when threshold value is set to fuel gas alternative；
When differential pressure pickup is abnormal, system may be selected shielding fuel oil and turn combustion gas judgement, be forced into combustion gas state, the pressure difference
The threshold value setting range of sensor or pressure sensor is 1~3Mpa, and automatically switches to pressure when differential pressure pickup failure
Sensor threshold values judges；
Specifically, by the analysis to differential pressure pickup, by MCU calculate after be scaled the pressure of combustion gas in correspondence steel cylinder, a side
Data transfer to switch is shown that tolerance is for reference by face by RS232 serial ports, is on the other hand flexibly set by debugging software
Constant-pressure lower bound, when pressure value is less than lower bound, control goes to fuel states in time；If differential pressure pickup is abnormal, automatic solution
Except the calculating of pressure difference amendment, and by pressure sensor 0-5V analog signal, by MCU calculate after be scaled correspondence steel cylinder internal combustion
The pressure of gas, when ECU detects voltage corresponding less than setting air pressure, switches to fuel oil；
When in-car fuel tank does not have oil, tach signal without or tach signal damage when, temperature signal it is abnormal when, driver to by
Key operation, long-press pressure more than 3 seconds, then into emergency rating, after ECU is detected, then no longer analyzes each biography with gas button
The state of sensor and the condition automatic shield for being converted to fuel oil, are started with gas or run automobile all the time.
2. a kind of LPG/CNG Double-fuels EFI control method according to claim 1, it is characterised in that the water
The threshold value of temperature is 0~90 degree of setting range.
3. a kind of LPG/CNG Double-fuels EFI control method according to claim 1, it is characterised in that the water
The threshold value of temperature is 30 degree.
4. a kind of LPG/CNG Double-fuels EFI control method according to claim 1, it is characterised in that the water
When temperature sensor is abnormal, releases water temperature and turn the basis for estimation of combustion gas as fuel oil, but engine speed is included into basis for estimation
In, when the pressure of gas storage cylinder is met, fuel oil turns combustion gas and engine speed also reaches that vehicle switchs to combustion gas when setting threshold value.
5. a kind of LPG/CNG Double-fuels EFI control method according to claim 4, it is characterised in that the hair
The signal of motivation rotating speed is derived from engine cam axle sensor or ignition coil or atomizer.
6. a kind of LPG/CNG Double-fuels EFI control method according to claim 1, it is characterised in that in combustion gas
Under state but optional use gas, when the gas storage cylinder pressure is less than given threshold, combustion gas is switched into fuel oil.
7. a kind of LPG/CNG Double-fuels EFI control method according to claim 1, it is characterised in that the step
Rapid three, the pressure value of step one and the temperature value of step 2 are respectively with setting threshold value to be compared, when the former is higher than setting threshold value
And fuel oil is carried out to fuel gas alternative when engine speed is higher than setting threshold values.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310051811.XA CN103993965B (en) | 2013-02-17 | 2013-02-17 | A kind of LPG/CNG Double-fuels EFI control method |
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| CN201310051811.XA CN103993965B (en) | 2013-02-17 | 2013-02-17 | A kind of LPG/CNG Double-fuels EFI control method |
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| CN103993965B true CN103993965B (en) | 2017-08-04 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104454185A (en) * | 2014-10-23 | 2015-03-25 | 奇瑞汽车股份有限公司 | Dual-fuel automobile fuel feed control method and system |
| CN108331668A (en) * | 2018-02-08 | 2018-07-27 | 浙江吉利控股集团有限公司 | Oil-gas switch method and system |
| CN109184930A (en) * | 2018-10-31 | 2019-01-11 | 奇瑞汽车股份有限公司 | engine system fuel supply control method and device, storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2001193511A (en) * | 2000-01-12 | 2001-07-17 | Fuji Heavy Ind Ltd | Fuel feed controller for engine |
| JP2004346815A (en) * | 2003-05-21 | 2004-12-09 | Toyota Motor Corp | Fuel changeover control method for bi-fuel engine |
| CN101761403A (en) * | 2010-03-04 | 2010-06-30 | 霸州市华威发动机技术有限公司 | Method and device for controlling gas supply of dual-fuel engine |
| CN102072036B (en) * | 2011-01-17 | 2013-01-16 | 吕国怀 | Method and device for controlling fuel-gas ratio of dual-fuel engine |
| CN102146854B (en) * | 2011-03-29 | 2013-09-11 | 重庆长安汽车股份有限公司 | Method for correcting ignition timing of natural gas and gasoline dual fuel engine |
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