CN107084057B - A kind of device and method that the fuel for controlling CNG dual-fuel vehicle is supplied - Google Patents

A kind of device and method that the fuel for controlling CNG dual-fuel vehicle is supplied Download PDF

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Publication number
CN107084057B
CN107084057B CN201710188458.8A CN201710188458A CN107084057B CN 107084057 B CN107084057 B CN 107084057B CN 201710188458 A CN201710188458 A CN 201710188458A CN 107084057 B CN107084057 B CN 107084057B
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fuel
cng
vehicle
petroleum
fuel injection
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CN107084057A (en
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鲁萌
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Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Automobile Research and Development Co Ltd
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Zhejiang Geely Holding Group Co Ltd
Ningbo Geely Automobile Research and Development Co Ltd
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02DCONTROLLING COMBUSTION ENGINES
    • F02D19/00Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

The device that the fuel that the present invention provides a kind of for controlling CNG dual-fuel vehicle is supplied, described device includes the fuel injection pulsewidth acquisition device for obtaining the fuel injection signal of cylinder transmission, the fuel injection signal includes fuel injection pulsewidth value and for the engine electronic control unit when the vehicle is in the larger operating condition of power demand, judges whether to switch over fuel by CNG fuel according to the fuel injection pulsewidth value.The described method includes: obtaining the fuel injection pulsewidth value for the fuel injection signal that cylinder is sent;When the vehicle is in the larger operating condition of power demand, judge whether fuel switching to Fuel Petroleum by CNG fuel according to the fuel injection pulsewidth value.The method that the necessary stage under steam that the present invention uses automatically switches to fuel oil mode, not only makes the dynamic property of dual-fuel vehicle more preferable, also fuel oil is made to have certain consumption naturally, to avoid the problem that largely fuel consumptions bringing to engine for a long time.

Description

A kind of device and method that the fuel for controlling CNG dual-fuel vehicle is supplied
Technical field
The present invention relates to engine electronic control system fields, more particularly to a kind of for controlling the combustion of CNG dual-fuel vehicle Expect the device and method of supply.
Background technique
CNG dual-fuel vehicle is substantially in the taxi vehicle applied to combustion gas repository, in this application, Driver often places one's entire reliance upon CNG fuel, and gasoline is only used to start, and the gasoline in such fuel tank constantly volatilizees, and colloid is continuous Accumulation often results in fuel injector blocking, keeps engine operation unstable.The gasoline quality in fuel tank is worse and worse, the worst simultaneously In the case where, will cause vehicle can not start, and user is often unaware of where problem, can only return to the maintenance of the shop 4S, in this way Unnecessarily increase user uses Che Chengben, also influences the public praise of vehicle.
For driver when suddenly accelerating and wishing to obtain the max speed, the fuel demand of per engine cycle is maximum, at this moment Fuel states are switched to, the dynamic property of vehicle can not only be improved, the oil spout circulation of big flow has also just reached us often Rush Xian's atomizer, with gasoline to the purpose for the colloid blocking for avoiding atomizer deposited.And judge driver suddenly to accelerate or The operating condition for wishing acquisition the max speed, can simply sum up in the point that the judgement to fuel injection pulsewidth, thus with a simple judgement Complete the identification to switching time.
Summary of the invention
In order to solve the problems, such as that CNG dual-fuel vehicle is switched fast fuel supplying mode under the larger operating condition of power demand, The device and method that the fuel that the present invention provides a kind of for controlling CNG dual-fuel vehicle is supplied, can be in driving conditions In the necessary stage prevent the utilization efficiency of a certain fuel is too low from causing vehicle and by Fuel switching at another fuel The problem of dynamic property deficiency;The technical problems to be solved by the invention further include realizing that a kind of bifuel system that rationally carries out is cut Change, can in reliably protecting fuel system equipment control method.
It is an object of the present invention to provide a kind of device that the fuel for controlling CNG dual-fuel vehicle is supplied, use The automatic switchover of fuel when controlling the vehicle in the non-start up stage, the CNG double fuel include CNG fuel and gasoline combustion Material, described device include:
Fuel injection pulsewidth acquisition device, for obtaining the fuel injection signal of cylinder transmission, the fuel injection signal includes spray Oily pwm value;
Engine electronic control unit, for when the vehicle is in the larger operating condition of power demand, according to the oil spout Pwm value judges whether fuel switching to Fuel Petroleum by CNG fuel.
Further, the engine electronic control unit is configured to when the fuel injection pulsewidth value is greater than the first preset value The fuel is switched into Fuel Petroleum by CNG fuel.
Further, the engine electronic control unit is configured to when the fuel injection pulsewidth value is less than the second preset value The fuel is switched into CNG fuel by Fuel Petroleum;
Wherein, first preset value is greater than second preset value.
Further, described device further include:
Gasoline tank, for storing the Fuel Petroleum;
CNG storage tank, for storing the CNG fuel;With
Fuel level sensor, for detecting oil level of the Fuel Petroleum in the gasoline tank.
Further, the engine electronic control unit is configured to be greater than the first preset value in the fuel injection pulsewidth value Meanwhile fuel is switched into gasoline combustion by CNG fuel when meeting the condition that Current fuel is not zero for CNG fuel and the oil level Material.
Further, the engine electronic control unit is configured to switch the fuel by Fuel Petroleum receiving To CNG fuel signal when, wait a preset time to reprocess the signal.
Further, the engine electronic control unit is configured to be in the non-start up stage in the vehicle and be not at When the larger operating condition of power demand, controlling the fuel is CNG fuel.
The method that the fuel that another aspect provides a kind of for controlling CNG dual-fuel vehicle is supplied, is used for Controlling the automatic switchover of vehicle fuel at the non-start up stage, the CNG double fuel includes CNG fuel and Fuel Petroleum, Described method includes following steps:
The fuel injection signal that cylinder is sent is obtained, the fuel injection signal includes fuel injection pulsewidth value;
When the vehicle is in the larger operating condition of power demand, according to the fuel injection pulsewidth value judge whether by fuel by CNG fuel switches to Fuel Petroleum.
Particularly, the engine electronic control unit is configured to incite somebody to action when the fuel injection pulsewidth value is greater than the first preset value The fuel switches to Fuel Petroleum by CNG fuel.
Particularly, the engine electronic control unit is configured to incite somebody to action when the fuel injection pulsewidth value is less than the second preset value The fuel switches to CNG fuel by Fuel Petroleum;
Wherein, first preset value is greater than second preset value.
One aspect of the present invention provides a kind of device that the fuel for controlling CNG dual-fuel vehicle is supplied, due to It can necessary stage when driving by by Fuel switching at another fuel, therefore the present invention can prevent it is a certain The utilization efficiency of kind of fuel is too low to cause power performance to be not enough to and the problem of other are in relation to engine.
Further, what the fuel that another aspect provides a kind of for controlling CNG dual-fuel vehicle was supplied Method, this method is using engine electronic control unit according to the fuel injection pulsewidth signal of the Fuel Petroleum unit received Actual value is compared with reference threshold, to quickly and easily select the fuel method of supplying of vehicle.
According to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will be brighter The above and other objects, advantages and features of the present invention.
Detailed description of the invention
Some specific embodiments of the present invention is described in detail by way of example and not limitation with reference to the accompanying drawings hereinafter. Identical appended drawing reference denotes same or similar part or part in attached drawing.It should be appreciated by those skilled in the art that these What attached drawing was not necessarily drawn to scale.In attached drawing:
Fig. 1 is showing for the device supplied according to the fuel for controlling CNG dual-fuel vehicle of one embodiment of the invention Example property structure chart;
Fig. 2 is shown in Fig. 1 for controlling the stream of the control method of the exemplary means of the fuel supply of CNG dual-fuel vehicle Cheng Tu.
Specific embodiment
Fig. 1 is showing for the device of the fuel supply according to an embodiment of the invention for controlling CNG dual-fuel vehicle Example property structure chart.Dual-fuel vehicle generally refers to have two sets of fuel systems, a set of supply natural gas of system or liquefaction stone Oil gas, the another set of fuel supplied except natural gas or liquefied petroleum gas, two sets of fuel feed systems are matched as scheduled to gas Cylinder supplies fuel, the automobile being mixed and burned in cylinder, such as the automobile of CNG gasoline double-fuel or the automobile of CNG diesel dual-fuel. The main fuel of such vehicle is CNG, and gasoline, which generally only serves, to ignite.Such engine structure parameter also almost without modification, It can two kinds of operating conditions of multifuel combustion flexibly switch simultaneously with gasoline in simple burns gasoline and CNG.Double fuel is presently mainly finger vapour Oil and CNG make the vehicle of fuel, using or with gasoline or cannot use CNG simultaneously.Since natural gas vehicle is in terms of discharge With apparent superiority, compared with using gasoline car, natural gas vehicle is granular material discharged almost nil, the row of NOx, CO and HC It puts and is significantly reduced, so natural gas vehicle important in inhibiting in terms of improving air quality.
Nevertheless, natural gas vehicle still has some problems, the taxi of combustion gas repository in use Under this application of type, driver often places one's entire reliance upon CNG fuel, and gasoline is only used to start, the gasoline in such fuel tank Constantly volatilization, colloid are constantly accumulated, and are often resulted in fuel injector blocking, are kept engine operation unstable.Gasoline in fuel tank simultaneously Worse and worse, in the worst case, will cause vehicle can not start quality, and user is often unaware of where problem, only meeting The maintenance of the shop 4S is returned to, unnecessarily increase user in this way uses Che Chengben, also influences the public praise of vehicle.
CNG dual-purpose fuel car be remain former car oil supply system it is constant on the basis of, increase it is a set of " CNG conversion System " forms.That is dual-fuel automobile is additional a set of gas supply on the basis of retaining the oil supply system of gasoline, diesel oil System.
In one embodiment of the invention, Fig. 1 show it is a kind of for control CNG dual-fuel vehicle fuel supply Device, the device generally may include engine 1, engine electronic control unit 2, fuel injection pulsewidth acquisition device 3, gasoline storage Tank 4, CNG storage tank 5 and fuel level sensor 6.It should be noted is that engine 1 of the invention further include with air inlet and Air discharges associated part, and generates power by Fuel Petroleum and CNG fuel.
Fuel Petroleum is provided to the combustion chamber of engine 1 by gasoline tank 4.Gasoline tank 4 includes for providing and controlling All devices of Fuel Petroleum.For example, gasoline tank 4 may include gasoline fuel tank, the burning line for providing gasoline, Yi Jiyong In the petrol injector of injected petrol.
CNG fuel is provided to the combustion chamber of engine 1 by CNG storage tank 5.CNG storage tank 5 includes for providing and controlling CNG All devices of fuel.For example, CNG storage tank 5 includes CNG fuel fuel tank, the burning line for providing CNG fuel, for spraying Penetrate CNG fuel CNG injector, vaporization liquid under CNG fuel vaporizer and mix CNG fuel and air mixing Device.
The vapour that the combustion chamber of engine 1 is ejected into after air and Fuel Petroleum therein mix can be used in gasoline tank 4 Oily multi-point injection method or in which the Fuel Petroleum combustion chamber that is directly injected into engine 1 the direct injection method of gasoline.
Fuel injection pulsewidth acquisition device 3 is defined as the fuel injection signal for obtaining cylinder transmission, the fuel injection signal Including fuel injection pulsewidth value;The time that fuel injection pulsewidth value is defined as the engine electronic control unit control each oil spout of fuel injector is long Degree.Such as vehicle is in when suddenly accelerating or wish that vehicle obtains the max speed operating condition, is sent according to this fuel injection pulsewidth acquisition device 3 Actual value to the fuel injection pulsewidth of engine electronic control unit 2 is compared with reference threshold, judges whether vehicle switches combustion Oily mode.
Engine electronic control unit 2 include signal generate logic, the signal generate logic for control Fuel Petroleum and The injection timing and the amount of injection of CNG fuel.
Fuel level sensor 6, for detecting oil level of the Fuel Petroleum in gasoline tank 4.
Fig. 2 is shown in Fig. 1 for controlling the stream of the control method of the exemplary means of the fuel supply of CNG dual-fuel vehicle Cheng Tu.In one embodiment, control method judges the mode of fuel supply in accordance with the following steps:
Step S1: engine electronic control unit 2 uses Fuel Petroleum as starting fluid, is specifically exactly engine Fuel Petroleum is provided to the combustion chamber of engine 1 by gasoline tank 4 by electronic control unit 2, and therefore executes vehicle launch;
Step S2: Fuel Petroleum is switched to CNG fuel in vehicle by engine electronic control unit 2, is specifically exactly Engine electronic control unit 2 by the way that the Fuel Petroleum in gasoline tank 4 to be switched to the CNG fuel in CNG storage tank 5, thus CNG fuel is provided to the combustion chamber of engine 1;Vehicle is using CNG fuel as the driving fuel of driving vehicle;
Step S3: CNG fuel is switched to vapour under the larger operating condition of power demand of vehicle by engine electronic control unit 2 Oil fuel;
Step S4: engine electronic control unit 2 judges the oil in gasoline tank in the larger operating condition of power demand of vehicle Whether amount is zero to carry out next step operation, and the actual conditions of judgement are:
When the oil mass in gasoline tank is zero, return step S2, engine electronic control unit 2 control vehicle continue with CNG fuel drives vehicle;
When the oil mass in gasoline tank is not zero, the next step of this step is executed;
Step S5: engine electronic control unit 2 meets vapour in step S4 in the larger operating condition of power demand of vehicle This step is executed in the case that oil mass is not zero in oil tank, the actual conditions of judgement are:
When fuel injection pulsewidth actual value is greater than the first preset value, operation is performed the next step;
When being unsatisfactory for fuel injection pulsewidth actual value greater than the first preset value, return step S2, engine electronic control unit 2 Vehicle is controlled to continue to drive vehicle with CNG fuel;
Step S6: engine electronic control unit 2 enters the larger operating condition of power demand in vehicle, and meets step S4 simultaneously In middle gasoline tank oil mass be not zero with fuel injection pulsewidth actual value in step S5 be greater than the first preset value in the case where execute this step Suddenly, motor vehicle fuel is switched to gasoline at this time;
Step S7: engine electronic control unit 2 switches motor vehicle fuel when vehicle enters the larger operating condition of power demand Under conditions of gasoline, if meeting following conditions:
When fuel injection pulsewidth actual value is less than the second preset value, return step S2, engine electronic control unit 2 is controlled at this time Vehicle processed drives vehicle with CNG fuel;
When fuel injection pulsewidth actual value is unsatisfactory for the condition less than the second preset value, step S6 is continued to execute, at this time vehicle Driving fuel is still gasoline.
Particularly, in order to avoid switching repeatedly, it should set: it is default that the first preset value in above-mentioned steps is greater than second Value.
One aspect of the present invention provides a kind of device that the fuel for controlling CNG dual-fuel vehicle is supplied, due to It can necessary stage when driving by the way that by Fuel switching, at the fuel different from driving fuel, therefore the present invention can To prevent the utilization efficiency of a certain fuel is too low from causing power performance to be not enough to and the problem of other are in relation to engine.
Another aspect of the present invention additionally provides a kind of method that the fuel for controlling CNG dual-fuel vehicle is supplied, should Method is using engine electronic control unit according to the actual value and ginseng of the fuel injection pulsewidth signal of the Fuel Petroleum unit received Threshold value comparison is examined, to quickly and easily select the fuel method of supplying of vehicle.
The method that the necessary stage under steam that the present invention takes automatically switches to fuel oil mode, not only makes dual-fuel vehicle Dynamic property it is more preferable, also fuel oil is made to have certain consumption naturally, so as to avoid be used for a long time CNG fuel brought to engine A series of problems.
So far, although those skilled in the art will appreciate that present invention has been shown and described in detail herein multiple shows Example property embodiment still without departing from the spirit and scope of the present invention, still can according to the present disclosure directly Determine or deduce out many other variations or modifications consistent with the principles of the invention.Therefore, the scope of the present invention is understood that and recognizes It is set to and covers all such other variations or modifications.

Claims (10)

1. a kind of device that the fuel for controlling CNG dual-fuel vehicle is supplied, for controlling the vehicle in the non-start up stage When fuel automatic switchover, the CNG double fuel includes CNG fuel and Fuel Petroleum, and described device includes:
Fuel injection pulsewidth acquisition device, for obtaining the fuel injection signal of cylinder transmission, the fuel injection signal includes oil spout arteries and veins Width values;
Engine electronic control unit, for when the vehicle is in the larger operating condition of power demand, according to the fuel injection pulsewidth Value judges whether fuel switching to Fuel Petroleum by CNG fuel.
2. the apparatus according to claim 1, wherein the engine electronic control unit is configured in the fuel injection pulsewidth The fuel is switched into Fuel Petroleum by CNG fuel when value is greater than the first preset value.
3. the apparatus of claim 2, wherein the engine electronic control unit is configured in the fuel injection pulsewidth The fuel is switched into CNG fuel by Fuel Petroleum when value is less than the second preset value;
Wherein, first preset value is greater than second preset value.
4. device according to any one of claim 1-3, wherein described device further include:
Gasoline tank, for storing the Fuel Petroleum;
CNG storage tank, for storing the CNG fuel;With
Fuel level sensor, for detecting oil level of the Fuel Petroleum in the gasoline tank.
5. device according to claim 4, wherein the engine electronic control unit is configured in the fuel injection pulsewidth Value be greater than the first preset value while, meet Current fuel be CNG fuel and the oil level be not zero condition when by fuel by CNG fuel switches to Fuel Petroleum.
6. device according to claim 4, wherein the engine electronic control unit is configured to receive will be described When fuel is switched to the signal of CNG fuel by Fuel Petroleum, a preset time is waited to reprocess the signal.
7. device according to claim 6, wherein the engine electronic control unit is configured to be in the vehicle Non-start up stage and when being not at the larger operating condition of power demand, controlling the fuel is CNG fuel.
8. a kind of method that the fuel for controlling CNG dual-fuel vehicle is supplied, for controlling the vehicle in the non-start up stage When fuel automatic switchover, the CNG double fuel includes CNG fuel and Fuel Petroleum, and described method includes following steps:
The fuel injection signal that cylinder is sent is obtained, the fuel injection signal includes fuel injection pulsewidth value;
When the vehicle is in the larger operating condition of power demand, judge whether to fire fuel by CNG according to the fuel injection pulsewidth value Material switches to Fuel Petroleum.
9. according to the method described in claim 8, wherein, being judged whether fuel according to the fuel injection pulsewidth value by CNG fuel Switching to Fuel Petroleum includes: to switch to the fuel by CNG fuel when the fuel injection pulsewidth value is greater than the first preset value Fuel Petroleum.
10. according to the method described in claim 9, wherein, also being wrapped after the fuel switches to Fuel Petroleum by CNG fuel It includes: the fuel being switched into CNG fuel by Fuel Petroleum when the fuel injection pulsewidth value is less than the second preset value;
Wherein, first preset value is greater than second preset value.
CN201710188458.8A 2017-03-27 2017-03-27 A kind of device and method that the fuel for controlling CNG dual-fuel vehicle is supplied Active CN107084057B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100865233B1 (en) * 2007-06-21 2008-10-23 콘티넨탈 오토모티브 시스템 주식회사 Method for changing fuel of bi fuel car
CN102953847A (en) * 2012-11-01 2013-03-06 许晨曦 Automobile gasoline and alcohol dual-fuel supply control method and system and fixing cushion block
CN103422997A (en) * 2012-05-24 2013-12-04 北汽福田汽车股份有限公司 Fuel feed system and method and vehicle provided with fuel feed system
CN103511094A (en) * 2013-09-22 2014-01-15 潍柴动力股份有限公司 Engine control method and device
CN103541827A (en) * 2013-11-13 2014-01-29 广西南宁权桂能源科技有限公司 Novel CNG fuel-gas hybrid power energy-saving control system
CN104373228A (en) * 2013-08-16 2015-02-25 现代自动车株式会社 Apparatus and method for controlling fuel supply of bi-fuel vehicle
CN105888857A (en) * 2016-06-22 2016-08-24 奇瑞汽车股份有限公司 Fuel switching control method for gasoline and CNG double-fuel vehicle
JP2016217331A (en) * 2015-05-26 2016-12-22 愛三工業株式会社 Fuel injection control device of internal combustion engine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100865233B1 (en) * 2007-06-21 2008-10-23 콘티넨탈 오토모티브 시스템 주식회사 Method for changing fuel of bi fuel car
CN103422997A (en) * 2012-05-24 2013-12-04 北汽福田汽车股份有限公司 Fuel feed system and method and vehicle provided with fuel feed system
CN102953847A (en) * 2012-11-01 2013-03-06 许晨曦 Automobile gasoline and alcohol dual-fuel supply control method and system and fixing cushion block
CN104373228A (en) * 2013-08-16 2015-02-25 现代自动车株式会社 Apparatus and method for controlling fuel supply of bi-fuel vehicle
CN103511094A (en) * 2013-09-22 2014-01-15 潍柴动力股份有限公司 Engine control method and device
CN103541827A (en) * 2013-11-13 2014-01-29 广西南宁权桂能源科技有限公司 Novel CNG fuel-gas hybrid power energy-saving control system
JP2016217331A (en) * 2015-05-26 2016-12-22 愛三工業株式会社 Fuel injection control device of internal combustion engine
CN105888857A (en) * 2016-06-22 2016-08-24 奇瑞汽车股份有限公司 Fuel switching control method for gasoline and CNG double-fuel vehicle

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