CN101655037B - Control method of methyl alcohol flexible fuel vehicle and system thereof - Google Patents
Control method of methyl alcohol flexible fuel vehicle and system thereof Download PDFInfo
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- CN101655037B CN101655037B CN2009100513904A CN200910051390A CN101655037B CN 101655037 B CN101655037 B CN 101655037B CN 2009100513904 A CN2009100513904 A CN 2009100513904A CN 200910051390 A CN200910051390 A CN 200910051390A CN 101655037 B CN101655037 B CN 101655037B
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Abstract
The invention relates to a control method of methyl alcohol flexible fuel vehicle and a system thereof. The system comprises a mixed fuel feeding system, an electronic control system and an engine, wherein, mixed fuel in a mixed fuel box comprises methyl alcohol and auxiliary fuel as the balance. A fuel recognition sensor is used for recognizing methyl alcohol content in fuel, corresponding data is transmitted to a data processing unit, the data processing unit analyzes the data and transmits a result to a central control unit, and the central control unit chooses a corresponding working module to adjust the corresponding control parameter, which ensures that the engine works at the optimum state. The invention mainly provides a control system of a methyl alcohol flexible fuel vehicle, which can add mixed fuel at any ratio to the mixed fuel box, needs no additives, has favorable starting performance and high dynamic property and discharges cleanly. The invention solves the technical problems that the fuel supply is out of control because of methyl alcohol-petrol mixed fuel delamination and vehicle starting performance is lowered in the prior art.
Description
Technical field
The present invention relates to a kind of fuel combination automobile, relate in particular to a kind of control method of methyl alcohol flexible fuel and system thereof.
Background technique
Along with the development of industrial technology, automobile becomes the important means of transportation of people.Main automotive fuel is a gasoline at present, is non-renewable fuel, and can pollutes environment.Novel fuel is that people expect, the fuel of motor car engine use now begins towards development in pluralism.The methanol production raw material is extensive, and the transportation of product, storage, packing filling and use are close with internal combustion motor benzin, the diesel fuel characteristics of being supplied in the market; Methyl alcohol octane value height, self contain oxygen burning thoroughly, flach point is than gasoline height, combustion process safety is a kind of desirable vehicle alternative fuel.
But also there is certain problem during as automotive fuel in methyl alcohol:
(1) methyl alcohol-gasoline mixed fuel lamination problem
The methyl alcohol hydroxyl has stronger polarity, can infinitely dissolve each other with water and is insoluble in hydrocarbon fuel.In certain mixed proportion, within the certain temperature range, methanol gasoline mixed fuel has stratification.Under same proportioning, the intersolubility of methyl alcohol and gasoline raises with temperature and changes, and vice versa.When methanol content hour, along with methanol content increases, the intersolubility of methyl alcohol and gasoline descends, delamination area expansion.When methanol content reached certain proportion, intersolubility was the poorest.Continue to increase methanol content, intersolubility is gone up, and delamination area reduces.
Moisture also very easily causes system layering, is storing and use can absorb moisture when mixing pure gasoline automatically from air, just occurs the profit stratification when moisture content acquires a certain degree.Owing to mix inequality, cause fuel supply reality out of control, engine performance descends, and running is unstable.Therefore, intersolubility and stability are the problems that methanol fuel for vehicles must solve.
The method of existing solution methyl alcohol-gasoline mixed fuel layering is to add cosolvent.At the particularity of methanol fuel, there are several difficult points in present this method:
1) the research difficulty of cosolvent is big, and a kind of cosolvent only is suitable for a kind of methyl alcohol-gasoline mixed fuel of mixed proportion; Mixed proportion changes, and corresponding need such as the adding quantity of cosolvent, composition adjust.
2) interpolation of cosolvent has increased the cost of methanol fuel for vehicles, and it is not obvious that the Economy of methanol fuel substitutes advantage.At last, the use of cosolvent has certain influence to the friction of motor, wearing and tearing, burn into discharging etc.
(2) cold start-up, cold-starting difficult problem
(particularly winter) rotating speed is low during engine cold-start, and air velocity is slow, adds that outside air temperature is low, thereby the fuel vaporization difficulty.And the latent heat of vaporization of methyl alcohol is more than 3 times of gasoline, so the heat that methanol gasoline was absorbed when evaporating is many, can cause the temperature at engine intake manifold place sharply to descend, and has further worsened the air inlet evaporation conditions.The saturated vapour pressure ratio gasoline that adds methyl alcohol is low by about 1/2, so have only a spot of alcohols can evaporate when cold start-up, does not reach the concentration limit that catches fire as if the concentration of the inflammable mixture that evaporates formation, then mixed gas can not fire burns, the engine start difficulty.Therefore use the automobile of methanol gasoline to use automobile cold start difficulty, the warm-up period of regular gasoline long.
(3) emission problem
Gasification latent heat height (the 1110kJ/kg of methyl alcohol, be 3.5 times of gasoline approximately), flash-point height (11 ℃), automobile uses methanol fuel directly to start, not only exist and start difficult problem, the more important thing is cold machine start-up course and start the back warming-up process that the methyl alcohol incomplete combustion will produce a large amount of combustion intermediate product-do not fire methyl alcohol and formaldehyde; Simultaneously, in this process, the best catalyzed conversion temperature of after-treatment system-triple effect catalytic converter no show still.So automobile uses methyl alcohol directly to start, the especially unconventional effulent of its discharging is more, and discharging is abominable, and environmental pollution is more serious.
At present, control and solution to the unconventional discharging of methanol vehicle emphasis is placed upon on the vent systems.Promptly study special catalyzer, PARA FORMALDEHYDE PRILLS(91,95) and do not fire methyl alcohol and carry out catalyzed conversion.
There is patent application also to do the research of this respect, as Chinese patent: " alcohol/gasoline flexibly jet control system and novel carbinol fuel automobile (ZL200720077854.5) " it utilizes control system, according to vehicle combination property and operating conditions information, control methyl alcohol flexibly, two kinds of fuel of gasoline are to indoor injection methanol fuel of engine combustion or Fuel Petroleum or spray quantitative methanol fuel and Fuel Petroleum simultaneously.Though this system has realized the problem that methyl alcohol and gasoline flexibly proportioning drive, it is to utilize methyl alcohol and gasoline two cover systems, is not implemented in any interpolation of methyl alcohol and gasoline in the same fuel tank fully, the problem that drives with any proportioning.
Summary of the invention
The present invention mainly provides a kind of fuel combination that can add methyl alcohol or gasoline or methanol gasoline in the fuel combination case with arbitrary proportion, and do not need to use any additives, fuel ratio is flexible, startability is good, the power character height, the control system and the method for the methyl alcohol flexible fuel vehicle of discharging cleaning; The fuel supply that the layering of solution existing in prior technology methyl alcohol-gasoline mixed fuel causes is out of control, the vehicle launch decreased performance, and power performance is bad, the technical problem of exhaust emission.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: a kind of control method of methyl alcohol flexible fuel, comprise start-up mode and mode of operation, described start-up mode is after ignition switch powers on, methanol fuel content in the fuel identification sensor identification fuel, if methanol fuel content≤10% then utilizes fuel combination system start-up; If methanol fuel content surpasses 10%, then utilize auxiliary fuel system start-up; Described mode of operation is after startup is finished, by the methanol content in the fuel identification sensor identification fuel, and give data processing unit with respective data transfer, data processing unit is analyzed data the result is flowed to central unit, transfer the corresponding operational module of choosing in the central unit, adjust corresponding Control Parameter, make engine operation in the optimum state.And in the course of the work, central unit can in time call different operational modules according to the situation of change of methanol content.Because the latent heat of vaporization of methyl alcohol is more than 3 times of gasoline, so it is big to absorb heat during the methyl alcohol evaporation, the methanol fuel evaporation is difficult; Add the vapor tension (38 ℃) of methyl alcohol, have only the 1/5-1/6 of gasoline, its air inlet evaporation conditions is further worsened.Therefore, motor is being lower than under 10 ℃ the temperature conditions, when using methyl alcohol directly to start, have only small amount of methanol evaporation, if the inflammable mixture concentration that evaporation forms does not reach when catching fire concentration limit, then mixed gas can not fire burns, cause the vehicle launch difficult problem, and discharged at lower temperature is also poor.Utilize the methanol content in the fuel identification sensor monitoring oil-way system, when methanol content is low, directly adopt auxiliary fuel system start-up, just utilize petrol system to start, the different operational module of fuel element Information Selection that the based on fuel identification sensor is passed back after startup, at a plurality of operational modules of central unit stored, the content of methyl alcohol is set in each operational module based on fuel, each operational module controlling and driving program is adjusted Control Parameter: as ignition advance angle, time of ignition, the emitted dose of fuel, discharge time etc., guarantee that engine operation is reliable, fuel combustion is complete, motor has the highest power output, guarantees the fuel economy and the exhaust index of methyl alcohol flexible fuel vehicle.
As preferably, described operational module comprises 11 modules, one of them module is an auxiliary fuel system works module, the fuel combination operational module of other ten modules for dividing according to methanol content, and the percentage composition that is followed successively by methyl alcohol is (0,10] operational module the time, the percentage composition of methyl alcohol (10,20] time operational module, the percentage composition of methyl alcohol is (20,30] operational module the time, the percentage composition of methyl alcohol (30,40] time operational module, the percentage composition of methyl alcohol is (40,50] operational module the time, the percentage composition of methyl alcohol (50,60] time operational module, the percentage composition of methyl alcohol is (60,70] operational module the time, the percentage composition of methyl alcohol (70,80] time operational module, the percentage composition of methyl alcohol is (80,90] operational module the time and the percentage composition of the methyl alcohol operational module when (90,100).Content according to methyl alcohol is divided into 10 with module, 10% being a Module Division, and control more accurate, thus also make the combustion efficiency of fuel improve greatly, the performance of methyl alcohol flexible fuel vehicle, methyl alcohol flexible fuel motor obtains optimum performance.Can certainly further increase the quantity of operational module according to the needs that reality is used, will make engine control more accurate like that.
As preferably, also synchronous operation of simultaneous faults monitoring pattern in the mode of operation operation, described malfunction monitoring pattern is to utilize pressure transducer real-time monitoring system pressure, if the supply system pressure value departs from 15% of regime values, pressure transducer sends to data processing unit with signal, data processing unit sends central unit to after with data analysis, and central unit calls malfunctioning module and carries out work.When malfunction monitoring mode discovery fuel combination system (perhaps petrol system) pressure depart from 0.35MPa normal pressure value 15% the time, the pressure transducer of fuel combination system (perhaps petrol system) can transfer data to central unit, central unit control gasoline (or fuel combination) FP Fuel Pump Relay is opened, the work of gasoline (or fuel combination) oil pump, set up gasoline (or fuel combination) system pressure, start gasoline (or fuel combination) and spray; Control fuel combination (or gasoline) injection simultaneously and stop, fuel combination (or gasoline) FP Fuel Pump Relay is closed, and fuel combination (or gasoline) oil pump quits work.Calculate gasoline (or fuel combination) then and supply with, calculate gasoline (or fuel combination) firing angle, start gasoline (or fuel combination) and spray.Roadside breakdown after the fail operation pattern can avoid automobile fuel combination supply system or auxiliary fuel supply-system to break down influences the normal use of vehicle, has improved the Security and the reliability of vehicle driving.When fail operation module table wherein is shown in wherein a kind of fuel system and breaks down, call another fuel system, such as the fuel combination work system is when breaking down, the work of auxiliary fuel system is just represented in the work of fail operation module, in like manner, when the auxiliary fuel system works broke down, the work of fail operation module represented that just the fuel combination work system begins to carry out work.
A kind of control system of methyl alcohol flexible fuel vehicle, comprise fuel combination supply system, electronic control system and motor, described fuel combination supply system comprises the fuel combination case, the fuel combination case is connected with co-fuel pump, fuel combination in the described fuel combination case comprises methyl alcohol, the percentage composition x of methyl alcohol is 0＜x＜100, and all the other are auxiliary fuel;
Side at described fuel combination supply system is provided with auxiliary fuel supply-system, and described auxiliary gas supply system comprises auxiliary fuel tank and the auxiliary fuel pump that links to each other with auxiliary fuel tank;
Described electronic control system comprises the flexible fuel electronic controller, and an end of flexible fuel electronic controller is connected with sensor unit, and the other end is connected with driver element.
Fuel ratio in the fuel combination case can be an arbitrary proportion, can arbitrarily add auxiliary fuel, methyl alcohol or auxiliary fuel and methanol mixture, as can arbitrarily adding the mixture of gasoline, methyl alcohol or methanol gasoline, and need not add additive, needn't worry dissolving each other and stable problem of two kinds of fuel, can give the flexible fuel electronic controller with information transmission by sensor unit, and the flexible fuel electronic controller can be regulated corresponding combustion parameter by the interior methanol content of based on fuel.In flexible fuel electronic controller stored many groups operational module, can based on fuel in different methanol contents call different modules, different module memories is storing up different Control Parameter.
The gasoline of different proportionings needs different additives with methyl alcohol, and the adding of these additives may cause that fuel is incomplete in the motor internal combustion, produces a large amount of carbon distributions, the serious inefficacy that also will cause motor.Gasoline in the utility model and methyl alcohol can arbitrary proportion add, and need not additive, have avoided the Study on Additive exploitation and the fuel that brings is expensive; Simultaneously because at the different fuel component, the flexible fuel electronic controller has the control corresponding module, can accurately control engine operation, make that in-engine fuel combustion is abundant, give full play to the efficient burning characteristic of methyl alcohol, improve the reliability of motor, reach the effect of cleaning discharging.
Side in the fuel combination system is provided with auxiliary Fuel Petroleum supply system, auxiliary fuel supply-system can be as start-up system when low temperature, when if the accidental system fault appears in the fuel combination supply system simultaneously, auxiliary Fuel Petroleum supply system guarantees the normal operation of vehicle, the operation stability, convenience and the Security that have improved vehicle.Petrol pump and co-fuel pump are internal pump, can certainly be external pump.
As preferably, described electronic controller comprises data input processing unit, central unit, output stage driver element; Sensor unit is connected with the data input processing unit, and the methanol content in the fuel identification sensor monitoring fuel combination case in the sensor unit is analyzed the input data by the data input processing unit; The data input processing unit is connected with central unit, and central unit is connecting the output stage driver element, and the output stage driver element is connecting performance element.The data of central unit based on fuel identification sensor transmission are adjusted Control Parameter flexibly, call corresponding control module.In the fuel combination case ratio of methyl alcohol and gasoline be arbitrarily, unknown, central unit decide Control Parameter according to data, thereby makes that burning is more abundant, discharging is more cleaned, the power character and the reliability of methyl alcohol flexible fuel vehicle are high.
As preferably, described sensor unit comprises the fuel identification sensor integrated with the blended fuel rail, is positioned at the fuel combination system pressure sensor on the fuel combination system oil-way, is positioned at the fuel combination fuel-quantity transducer of fuel combination case; Be positioned at the auxiliary fuel fuel-quantity transducer of auxiliary fuel tank, be positioned at the auxiliary fuel system pressure sensor on the auxiliary fuel system pipeline, be positioned at speed probe, cooling-water temperature transmitter and detonation sensor on the motor, be positioned at the throttle position sensor on the throttle plate pin, be positioned at the air inlet pressure sensor of admission line.As more preferably, described auxiliary fuel is gasoline or diesel oil.The fuel identification sensor also can be installed in the oil circuit of fuel combination system, the fuel identification sensor is installed on the blended fuel rail that fuel combination will be transported to motor among the present invention, and with the integrated design of blended fuel rail, the methanol content that can more real reaction enters in-engine fuel combination improves the accuracy of control.Monitor the fuel combination system and whether the auxiliary fuel system breaks down by the numerical value of fuel combination system pressure sensor and auxiliary fuel system pressure sensor transmissions, when the supply system pressure value depart from 0.35Mpa regime values 15% the time, the fuel supply system of expression work at present goes wrong, need call fault mode, promptly another fuel system is started working.Fuel-quantity transducer is monitored the Fuel Oil Remaining in the fuel tank in real time, thereby need to determine whether refuelling, makes things convenient for driver and passenger to drive and goes on a journey.
Therefore, the control system of a kind of methyl alcohol flexible fuel vehicle of the present invention and method thereof have following advantage: the additive that 1, does not need to use methyl alcohol and two kinds of fuel mix of auxiliary fuel (as gasoline or diesel oil).Can in the fuel combination case, arbitrarily add methyl alcohol or auxiliary fuel (as gasoline or diesel oil) or both mixtures, need not to use any additives, save the research and development expenses such as preparation of fuel combination, reduced vehicle research and development expense and vehicle user cost, good economy performance.2, flexibility maximum.Realize the mixing use of the arbitrary proportion of two kinds of fuel from 0 to 100 of methyl alcohol and auxiliary fuel (as gasoline or diesel oil), reached maximum flexibility.3, low-temperature startup performance is good, cold-starting process discharging cleaning.This invention is provided with auxiliary fuel and starts work system, when vehicle launch, monitor out in the fuel combination methanol content greater than 10% as the fuel identification sensor, then system directly changes auxiliary fuel startup mode of operation over to, has perfectly solved the technical barrier of cold-starting difficulty and cold-starting process discharging difference.4, good dynamic property, the discharging cleaning.This invention is in conjunction with the adaptivity of electronic control system, at independent auxiliary fuel (as gasoline or diesel oil), the fuel combination of 5% left and right sides methanol content, the fuel combination of 15% left and right sides methanol content, the fuel combination of 25% left and right sides methanol content, the fuel combination of 35% left and right sides methanol content, the fuel combination of 45% left and right sides methanol content, the fuel combination of 55% left and right sides methanol content, the fuel combination of 65% left and right sides methanol content, the fuel combination of 75% left and right sides methanol content, the fuel combination of the fuel combination of 85% left and right sides methanol content and 95% left and right sides methanol content, totally 11 kinds of fuel classifications, carry out the demarcation and the debugging of motor respectively, when guaranteeing that motor uses any fuel, optimum power output is arranged, best Economy performance, and the discharging of cleaning most.And the fuel combustion that pumps into motor is complete, and the Economy advantage is remarkable.5, be provided with auxiliary fuel mode of operation and fault mode, improved the stability of vehicle, can do corresponding adjustment to Control Parameter according to vehicle condition, guarantee that engine operation is reliable, fuel transforms, exports with peak efficiency, guarantees Economy and exhaust index.
Description of drawings:
Fig. 1 is the schematic representation of the control system of a kind of methyl alcohol flexible fuel vehicle of the present invention.
Fig. 2 is the flow chart of a kind of control method of methyl alcohol flexible fuel of the present invention.
Fig. 3 is the schematic representation of the electronic control system in Fig. 1.
Fig. 4 is the auxiliary fuel system works flow process figure in Fig. 2.
Fig. 5 is the fault mode workflow diagram in Fig. 2.
Embodiment:
Below by embodiment, and in conjunction with the accompanying drawings, technological scheme of the present invention is described in further detail.
Embodiment:
As shown in Figure 1, a kind of control system of methyl alcohol flexible fuel vehicle comprises fuel combination supply system, auxiliary fuel supply-system, electronic control system and motor, and wherein auxiliary fuel supply-system is auxiliary Fuel Petroleum supply system.The fuel combination supply system comprises fuel combination case 1, can arbitrarily add the mixture of gasoline or methyl alcohol or two kinds of fuel in the fuel combination case 1, does not need to add any additives.Fuel combination case 1 is connected with co-fuel pump 2, fuel combination fuel-quantity transducer 3 is installed in fuel combination case 1, on co-fuel pump 2, be connected with co-fuel pump relay 4, be connected with oil circuit 5 on the co-fuel pump 2, fuel combination filter cleaner 6 and fuel combination system pressure sensor 7 are installed on the oil circuit 5.In a side of fuel combination case 1 petrol tank 8 less than 15L is installed, be provided with petrol pump 9 and gasoline fuel-quantity transducer 10 in the petrol tank 8, petrol pump 9 is connected with petrol pump relay 11 and pipeline road 12, and gasoline filter 13 and petrol system pressure transducer 14 are installed on the pipeline road 12.Be separately installed with gasoline fueling injection equipment and fuel combination fueling injection equipment at the motor upside, the gasoline fueling injection equipment comprises gasoline ejector 15, gasoline oil rail 16 and gasoline pressure regulator 17, the fuel combination fueling injection equipment comprises fuel combination oil sprayer 18, blended fuel rail 19 and mixed fuel pressure regulator 20, is integrated with propellant composition identification sensor 21 on blended fuel rail 19.Throttle position sensor 22 is installed on throttle plate pin, the speed probe 23 of monitoring engine speed is installed on motor and monitors the detonation sensor 24 that whether has pinking to take place in the motor, various kinds of sensors is connected with various kinds of sensors by wire harness, and the other end is connected with driver element.Flexible fuel electronic controller 25 is circumscribed with demarcates computer 27 and storage battery 28.Flexible fuel electronic controller 25 comprises data input processing unit, central unit, output stage driver element; Sensor unit is connected with the data input processing unit, and the methanol content in the fuel identification sensor monitoring fuel combination case in the sensor unit is analyzed the input data by the data input processing unit; The data input processing unit is connected with central unit, and central unit is connecting the output stage driver element, and the output stage driver element is connecting performance element (as shown in Figure 3).Include 11 operational modules in the central unit, one of them module is an auxiliary fuel system works module, the fuel combination operational module of other ten modules for dividing according to methanol content, the percentage composition that is followed successively by methyl alcohol (0,10] time module, the percentage composition of methyl alcohol is (10,20] module the time, the percentage composition of methyl alcohol (20,30] time module, the percentage composition of methyl alcohol is (30,40] module the time, the percentage composition of methyl alcohol (40,50] time module, the percentage composition of methyl alcohol is (50,60] module the time, the percentage composition of methyl alcohol (60,70] time module, the percentage composition of methyl alcohol is (70,80] module the time, the percentage composition of methyl alcohol (80,90] time the module of percentage composition when (90,100) of module methyl alcohol.The data about methanol content of based on fuel identification sensor transmission are selected different operational modules, thereby adjust the control corresponding parameter, as the emitted dose of ignition advance angle, time of ignition, fuel, discharge time etc., to guarantee the reliable operation of motor, fuel is with the peak efficiency change of team, output.
As shown in Figure 2, according to above-mentioned structure, methyl alcohol flexible fuel vehicle flexible controlling method as follows: after ignition switch powers on, flexible fuel electronic controller 25 control co-fuel pump relays 4 are opened, start co-fuel pump 2, set up the methanol gasoline mixed fuel system pressure, because methyl alcohol and gasoline in the fuel combination case are any proportionings, the fuel combination that pumps is determined the content of methyl alcohol by the fuel identification sensor, selects by which kind of mode to start with this.Whether the methanol content in the propellant composition identification sensor 21 monitoring fuel combinations is greater than 10%, if greater than 10%, then sending command control gasoline FP Fuel Pump Relay 11 by flexible fuel electronic controller 25 opens, petrol pump 9 work, set up auxiliary petrol system pressure, auxiliary fuel system works module in the central unit is started working, calculate the gas supply amount, calculate the gasoline firing angle, start petrol-injected gasoline and start mode of operation: gasoline pressure regulator 14 makes gasoline injection pressure keep constant, the gasoline of the 0.35Mpa pressure after the adjusting, to deliver to gasoline ejector 15, accept the control command of flexible fuel electronic controller, be sprayed onto the flexible fuel engine burning, excessive gasoline will be by the gasoline pressure regulator 17 break-even petrol tanks 8 that return; Simultaneously, flexible fuel electronic controller controls co-fuel pump cut-off, co-fuel pump quits work (as shown in Figure 4).If monitor methanol content in the fuel combination less than 10%, then with fuel combination system start-up, the percentage composition that promptly calls methyl alcohol is (0,10] operational module the time starts, co-fuel pump 2 pumps fuel combination with the pressure greater than 0.35Mpa from fuel combination case 1, the fuel combination filter cleaner 6 of flowing through, remove impurity after, enter blended fuel rail 19.Mixed fuel pressure regulator 20 makes hybrid fuel jet pressure keep constant, the fuel combination of the 0.35Mpa pressure after the adjusting, to deliver to fuel combination oil sprayer 18, accept the control command of flexible fuel electronic controller, be sprayed onto the flexible fuel engine burning, excessive fuel combination will be by the break-even fuel combination case that returns of mixed fuel pressure regulator.Guaranteed the low-temperature startup performance of vehicle, simultaneously the discharging of cold-starting process cleaning.
After the startup, coolant temperature according to 26 monitorings of flexible fuel engine cooling-water temperature transmitter, if reach 40 ℃～60 ℃ temperature ranges, then change the methanol gasoline mixed fuel mode of operation over to, methanol content in the fuel combination of based on fuel identification sensor monitoring, whether (0,10] or (10,20] or (20,30] or (30,40] or (40,50] or (50,60] or (60,70] or (70,80] or (80,90] or (90,100) in 10 intervals, corresponding respectively 5% methanol content working procedure or 15% methanol content working procedure or 25% methanol content working procedure or 35% methanol content working procedure or 45% methanol content working procedure or 55% methanol content working procedure or 65% methanol content working procedure or 75% methanol content working procedure or 85% methanol content working procedure or the 95% methanol content working procedure of entering, under the situation that propellant composition constantly changes, motor can be according to the operational data of the storage in the flexible fuel controller, adjust the corresponding work parameter, as: time of ignition, ignition advance angle, fuel injection amounts etc. are guaranteed the optimum performance output of motor.
As shown in Figure 5, when vehicle moves after startup, the also synchronous operation of malfunction monitoring pattern, the malfunction monitoring pattern is to utilize system pressure sensor real-time monitoring system pressure, if the supply system pressure value depart from 0.35Mpa regime values 15%, pressure transducer takes place signal to data processing unit, and data processing unit sends central unit to after with data analysis, and central unit calls malfunctioning module and carries out work.If work this moment is the fuel combination system, pressure sensor monitoring departs from 15% of normal pressure value to the fuel combination system pressure, and the flexible fuel electronic controller can send instruction, the gasoline FP Fuel Pump Relay is opened, petrol system pressure is set up in the work of gasoline oil pump, starts gasoline injection, controlling hybrid fuel jet simultaneously stops, fuel combination oil pump cut-off, the fuel combination oil pump quits work, and calculates gas supply, calculate the gasoline firing angle, start gasoline injection.When the gasoline mode of operation breaks down,, will change fuel combination system works pattern over to, guarantee the normal operation of vehicle according to above same mode.
The additive that does not need to use methyl alcohol and gasoline mixing of the present invention.Realize the mixing use of the arbitrary proportion of two kinds of fuel of methyl alcohol and gasoline from 0 to 100, reached maximum flexibility.Can in the fuel combination case, arbitrarily add methyl alcohol or gasoline or both mixtures, need not to use any additives, save the research and development expenses such as preparation of fuel combination, reduce vehicle research and development expense and vehicle user cost, good economy performance.
Claims (3)
1. control method of methyl alcohol flexible fuel, comprise start-up mode and mode of operation, it is characterized in that: described start-up mode is after ignition switch powers on, methanol fuel content in the fuel identification sensor identification fuel, if methanol fuel content≤10%, then utilize fuel combination system start-up,, then utilize auxiliary fuel system start-up if methanol fuel content surpasses 10%; Described mode of operation is after startup is finished, by the methanol content in the fuel identification sensor identification fuel, and give data processing unit with respective data transfer, data processing unit is analyzed data, the result is flowed to central unit, central unit transfers the corresponding operational module of choosing to adjust Control Parameter, and in the course of the work, central unit can call different operational modules according to the situation of change of methanol content.
2. a kind of control method of methyl alcohol flexible fuel according to claim 1, it is characterized in that: described operational module comprises 11 modules, one of them module is an auxiliary fuel system works module, the fuel combination operational module of other ten modules for dividing according to methanol content, the percentage composition that is followed successively by methyl alcohol is (0,10] operational module the time, the percentage composition of methyl alcohol (10,20] time operational module, the percentage composition of methyl alcohol is (20,30] operational module the time, the percentage composition of methyl alcohol (30,40] time operational module, the percentage composition of methyl alcohol is (40,50] operational module the time, the percentage composition of methyl alcohol (50,60] time operational module, the percentage composition of methyl alcohol is (60,70] operational module the time, the percentage composition of methyl alcohol (70,80] time operational module, the percentage composition of methyl alcohol is (80,90] operational module the time and the percentage composition of the methyl alcohol operational module when (90,100).
3. a kind of control method of methyl alcohol flexible fuel according to claim 1 and 2, it is characterized in that: in the also synchronous operation of simultaneous faults monitoring pattern of mode of operation operation, described malfunction monitoring pattern is to utilize pressure transducer to monitor supply system pressure in real time, if the supply system pressure value departs from 15% of regime values, pressure transducer sends to data processing unit with signal, data processing unit sends central unit to after with data analysis, and central unit calls malfunctioning module and carries out work.
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| DE102011010508B4 (en) * | 2011-02-07 | 2016-10-27 | Audi Ag | Method and device for detecting the quality of fuel in a fuel tank of an internal combustion engine |
| US8612119B2 (en) * | 2011-05-23 | 2013-12-17 | GM Global Technology Operations LLC | Adaptation control of lean NOx trap regeneration with biodiesel during engine transient operation |
| CN104930506B (en) * | 2015-05-08 | 2017-08-11 | 桂林市淦隆环保科技有限公司 | The automatic identifying method lighted a fire using alcohol-based fuel specific gravity control intelligent burner |
| CN106481462B (en) * | 2016-11-21 | 2019-08-23 | 浙江吉利控股集团有限公司 | A kind of methanol engine cold start system |
| CN108869063B (en) * | 2018-05-28 | 2021-08-20 | 潍柴动力股份有限公司 | Control method and device for dual-fuel engine |
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