CN101280728A - Methanol fuel engine cold-starting control method and system - Google Patents
Methanol fuel engine cold-starting control method and system Download PDFInfo
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- CN101280728A CN101280728A CNA2008101116813A CN200810111681A CN101280728A CN 101280728 A CN101280728 A CN 101280728A CN A2008101116813 A CNA2008101116813 A CN A2008101116813A CN 200810111681 A CN200810111681 A CN 200810111681A CN 101280728 A CN101280728 A CN 101280728A
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Abstract
A cold start-up control method of a methanol fuel engine and a system thereof pertain to the automobile field. The invention is characterized in that an input circuit, a microcontroller and an output circuit are additionally arranged between the original on-board computer and the original fuel injection execution unit in sequence. A cold start-up unit is added based on the original fuel supply system of an automobile; the microcontroller consists of a plurality of micro control chips and peripheral circuits, wherein, the micro control chips and the peripheral circuits with the number the same as the number of the cylinder of the engine are called as a control signal processing module which is in charge of respective processing on control signals of each cylinder of the engine; the other micro control chip and the related peripheral circuit are an administration module which takes charge of administrating the operation of other chips and accurately controlling the cold start-up unit; the cold start-up unit comprises a fuel identification sensor, a temperature sensor, an auxiliary fuel tank and a gasoline pump; the fuel identification sensor, the temperature sensor and the gasoline pump are respectively connected with the administration module. The method and the system of the invention can realize the cold start-up of the methanol fuel.
Description
Technical field:
The present invention relates to a kind of control system of motor car engine cold-starting, especially can solve the control system of methanol fuel cold-starting difficulty.
Background technique:
Lack of energy and environmental pollution are the serious problems that the current whole world faces.Along with increasing sharply of automobile quantity, oil is that the imbalance between supply and demand of fuel becomes increasingly conspicuous in worldwide, and motor car engine consumes the gasoline enormous amount, and vehicle exhaust also becomes one of main source of pollution of atmosphere.Consider that from resource, environment, each side such as economic, practical the new cleaning alternative energy resources of research and development has become the task of top priority.And the methyl alcohol wide material sources, physicochemical property has octane value and the self-ignition point higher than gasoline near gasoline, and theoretical mixture gas calorific value and gasoline are approaching, and Flammability limits is wide, and the latent heat of vaporization is big, has good combustion characteristic, is the good alternative fuel of gasoline.
Practical now motor car engine is many to be fuel with gasoline, and make gasoline-fueled motor is alternative fuel and energy proper functioning with methyl alcohol, must improve petrolic control system.Can know relatively that from the physicochemical properties of methyl alcohol and gasoline the methyl alcohol ignition heat is lower than the ignition heat of gasoline, obtain the fuel that enough energy must make methanol fuel that each work cycle of motor obtains obtain under more than the gasoline state under the situation of combustion methanol in order to make motor.
In addition, the latent heat of vaporization of methyl alcohol is about the twice of gasoline vaporising latent heat.In methyl alcohol enters the process of cylinder, can absorb the heat of tube wall on the way, reduce the temperature of motor, improve the thermal efficiency.But because the low-temperature startup performance of bigger latent heat of vaporization methanol-fueled engine is relatively poor, it is generally acknowledged that temperature is lower than that 10 degrees centigrade of methanol-fueled engines start will difficulty (this temperature value of different proportionings according to vehicle condition and methanol fuel has difference).This also becomes the difficult point place of methanol vehicle research.
Summary of the invention:
In order to make motor car engine energy proper functioning under the situation of different fuel, the invention provides a kind of micro control system.This control system is handled the control signal of former car computer, make motor the burning different proportioning methanol fuels situation under can both proper functioning.Simultaneously, this controller can be realized the accurate control to low-temperature startup device, solves the cold-starting problem of methanol fuel.
To achieve these goals, the design proposal that the present invention takes is as follows: as shown in figure 10, comprise former car computer and oil spout performance element, it is characterized in that: between former car computer and oil spout performance element, also comprise input circlult successively, microcontroller and output circuit, and on former car oil supply system basis, install the cold-starting unit additional; Described microcontroller is made up of a plurality of microcontroller chips and peripheral circuit; Wherein count same number microcontroller chip and peripheral circuit is called the control signal puocessing module, be responsible for the control signal of each cylinder of motor is handled respectively with cylinder; Other has a microcontroller chip and peripheral circuit thereof is administration module, and responsible working state to remaining chip manages and realize the accurate control to the cold-starting unit; Described cold-starting unit comprises fuel identification sensor, temperature transducer, drop tank and petrol pump; Fuel identification sensor, temperature transducer and petrol pump are connected to above-mentioned administration module respectively, and drop tank connects petrol pump.
Working procedure of the present invention is as follows: install this controller additional on former car petrol engine basis.As shown in Figure 1, the control signal that former car computer sends is admitted to microcontroller after handling through input circlult, microcontroller is handled former car control signal under software control, signal after treatment makes motor obtain enough methanol fuels with proper functioning by output circuit control oil spout performance element.When burning, can make corresponding change to control signal automatically, make the motor proper functioning by hand switch or by the microcontroller chip of being in charge of for gasoline.
In order to solve the problem of methanol engine cold-starting, the present invention has increased fuel identification sensor, drop tank and temperature transducer on former car basis.The fuel identification sensor is used for discerning the proportioning of methanol fuel in the fuel tank, and test result is passed to microcontroller.Microcontroller is made the delay process of different length to former car control signal according to the different proportionings of methanol fuel.When being cold-starting, the effect of drop tank provides Fuel Petroleum for motor.Temperature transducer is used for the temperature of detection of engine cooling liquid and whether fuel in the pipeline is replaced and the temperature that whether reaches cold-starting with decision.As the condition that satisfies cold-starting then the microprocessor control executive component close main oil pump, the open auxiliary oil pump, motor normally starts the back microcontroller and judges whether to be converted to methanol fuel according to temperature, reach reverse temperature or, close auxiliary oil pump herein through controller opens main oil pump after 10 to 60 seconds time (time is according to engine operating condition, methanol fuel proportioning and engine temperature decision).After motor quits work, whether microcontroller replaces fuel in the pipeline according to the temperature decision of motor, as reach the temperature (being generally 10 degrees centigrade) of setting, then microcontroller open auxiliary oil pump pumps into gasoline in pipeline, and methyl alcohol remaining in the oil supply pipeline is released pipeline.The time that pumps into gasoline preestablishes according to duct length.
The invention has the beneficial effects as follows:
1: the problem that has successfully solved the methanol fuel engine cold-starting difficulty.
2: former car is changed motor is being used under the situation of different proportioning methanol fuels can both proper functioning, and make key indexs such as engine power, discharging be not less than former car.
Description of drawings:
The present invention is further described below in conjunction with accompanying drawing:
Fig. 1 is a principle of the invention schematic representation.
Fig. 2 is an oil supply system repacking principle schematic one of the present invention.
Fig. 3 is an oil supply system control principle schematic representation of the present invention.
Fig. 4 is control signal puocessing module circuit theory diagrams of the present invention.
Fig. 5 is administration module circuit theory diagrams of the present invention.
Fig. 6 oil supply system repacking of the present invention principle schematic two.
Fig. 7 oil supply system repacking of the present invention schematic representation three.
Fig. 8 oil supply system repacking of the present invention schematic representation four.
Fig. 9 is a control signal puocessing module circuit diagram of the present invention.
Figure 10 controller principle schematic representation of the present invention.
Figure 11 applicating flow chart one of the present invention.
Figure 12 applicating flow chart two of the present invention.
Embodiment:
The selected microcontroller chip model of present embodiment is AT89S52.
As shown in Figure 1, between former car computer and oil spout performance element, increase micro controller system.
The physical circuit of this microprocessor control signal processing module as shown in Figure 4.Form by input circlult, output circuit and microcontroller chip.The RESET pin of microcontroller chip connects a capacitor C 2, a termination Vcc of capacitor C 2, resistance R 6 of another termination, the other end ground connection of resistance R 6.The P1.0 pin of microcontroller chip meets an optocoupler U2,1 pin of optocoupler U2 connects the negative pole of reference diode D2, the positive pole of reference diode D2 connects+12 volts of power supplys, the 2 pin connecting resistance R8 of optocoupler U2, the former car computer of the other end of resistance R 8,3 pin of optocoupler U2 meet Vcc, and 4 pin of optocoupler U2 connect a resistance R 7, the other end ground connection of resistance R 7.
The end of the P1.1 pin connecting resistance R1 of microcontroller chip, 2 pin of another termination optocoupler U1 of resistance R 1,1 pin of optocoupler U1 meets Vcc, the 3 pin connecting resistance R2 of optocoupler U1, the other end connecting resistance R3 of resistance R 2, the other end ground connection of resistance R 3,4 pin of optocoupler U1 connect+12 volts of power supplys.The indirect resistance R 4 of resistance R 2 and R3, the G utmost point of another termination field effect transistor FET1 of resistance R 4, the D utmost point of field effect transistor FET1 connects the oil spout performance element, the S utmost point ground connection of field effect transistor FET1.
This module embodiment 2 replaces optocoupler U1 and U2 by triode Q1 and Q2 as shown in Figure 9.
The administration module embodiment circuit of this invention as shown in Figure 5.The RESET pin of microcontroller chip connects a capacitor C 2, a termination Vcc of capacitor C 2, resistance R 6 of another termination, the other end ground connection of resistance R 6.The INT0 pin of microcontroller chip connects the C utmost point of triode Q1, the C utmost point connecting resistance R4 of triode Q1, another termination Vcc of resistance R 4.The B utmost point connecting resistance R3 of triode Q1, resistance R 3 the other end connecting resistance R1, another termination automobile ignition switch of resistance R 1.The E utmost point connecting resistance R2 of triode Q1, resistance R 2 connects automobile ignition switch by resistance R 1.The TXD pin connecting resistance R5 of microcontroller chip, 2 pin of another termination optocoupler U3 of resistance R 5,1 pin of optocoupler U3 meets Vcc, the 3 pin connecting resistance R7 of optocoupler U3, resistance R 7 the other end connecting resistance R8, the other end ground connection of resistance R 8,4 pin of optocoupler U3 connect+the 12V power supply.Resistance R 9 one terminating resistor R8, the G utmost point of another termination field effect transistor FET2, the D utmost point that meets field effect transistor FET2 connects the negative pole of petrol pump, and the positive pole of petrol pump connects+the 12V power supply, the S utmost point ground connection of field effect transistor FET2.
The RXD pin connecting resistance R10 of microcontroller chip, 2 pin of another termination optocoupler U2 of resistance R 10,1 pin of optocoupler U2 meets Vcc, the 3 pin connecting resistance R11 of optocoupler U2, resistance R 11 the other end connecting resistance R12, the other end ground connection of resistance R 12,4 pin of optocoupler U2 connect+the 12V power supply.Resistance R 13 1 terminating resistor R12, the G utmost point of another termination field effect transistor FET1, the D utmost point that meets field effect transistor FET1 connects the negative pole of methanol pump, and the positive pole of methanol pump connects+the 12V power supply, the S utmost point ground connection of field effect transistor FET1.
Being characterized as of cold-starting unit increases temperature transducer, drop tank, auxiliary oil pump and transport pipe on the basis of former car oil supply system.Embodiment 1 as shown in Figure 2, temperature transducer is used for measuring engine temperature, and it is contacted with the engine body face, perhaps immerses in the engine coolant.Gasoline transport pipe starting point is that drop tank is connected to in-line at oily rail oil inlet end by threeway.Return tube extends to main fuel tank at oily rail oil outlet end behind reduction valve.
The embodiment 2 of cold-starting do-part as shown in Figure 6, for some vehicle, as Xiali A+ etc., oily rail oil-feed oil return is in the same side.In such cases, requiring with the drop tank is the gasoline transport pipe of starting point and being connected as far as possible near oily rail oil inlet end of oil inlet pipe.The oil outlet end of oil rail is connected to return tube by reduction valve, and extends to main fuel tank.
The embodiment 3 of cold-starting unit as shown in Figure 7, methyl alcohol transport pipe and gasoline transport pipe are connected to the oil inlet end of oily rail in this embodiment by a threeway.Oil outlet end return tube at oily rail is divided into two, returns main fuel tank and drop tank respectively.Return main fuel tank pipeline be connected to pressure valve control, the pipeline that returns drop tank is by electromagnetic valve.Closed electromagnetic valve when main oil pump is worked, oil return enters main fuel tank.Solenoid valve is opened when auxiliary pump is worked, because another pipeline is equipped with pressure valve, oil return enters drop tank.The opening and closing of solenoid valve are by microprocessor control.
The embodiment 4 of cold-starting unit as shown in Figure 8, for some vehicles such as Cherry, reduction valve is at former car fuel tank internal, draws return tube by threeway in the middle of oil inlet pipe, gets back to main fuel tank through reduction valve in the fuel tank again.Require gasoline transport pipe and as far as possible close oily rail oil inlet end of being connected of oil inlet pipe in this case.
This invention control flow embodiment as shown in figure 11, the temperature of detection of engine cooling liquid at first after motor is started working opens if temperature is higher than setting temperature (being generally 10 degrees centigrade) then enters heat, opens methanol pump and closes petrol pump.If temperature just enters cold opening and opens petrol pump for low 10 degrees centigrade, close methanol pump.After engine temperature rose to setting temperature (being generally 10 degrees centigrade), controller was closed petrol pump and is opened methanol pump.Behind engine misses, temperature transducer detection of engine temperature is if be lower than setting temperature (being generally 10 degrees centigrade) then open petrol pump fuel in managing is replaced.The time of opening of petrol pump preestablishes according to transport pipe length herein.
This invention control flow embodiment 2 as shown in figure 12, the temperature of detection of engine cooling liquid at first after motor is started working opens if temperature is higher than setting temperature (being generally 10 degrees centigrade) then enters heat, opens methanol pump and closes petrol pump.Open petrol pump if temperature is lower than setting temperature (being generally 10 degrees centigrade) then enters cold opening, close methanol pump.After 10 to 60 second time, controller is closed petrol pump and is opened methanol pump.Behind engine misses, temperature transducer detection of engine temperature is if be lower than setting temperature (being generally 10 degrees centigrade) then open petrol pump fuel in managing is replaced.The time of opening of petrol pump preestablishes according to transport pipe length herein.
The above; only be the several of the specific embodiment of the invention, but protection scope of the present invention is not limited thereto, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed in the technical scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claims.
Claims (2)
1. the control system of a methanol fuel engine cold-starting, comprise former car computer and oil spout performance element, it is characterized in that: between former car computer and oil spout performance element, also comprise input circlult successively, microcontroller and output circuit, and on former car oil supply system basis, install the cold-starting unit additional;
Described microcontroller is made up of a plurality of microcontroller chips and peripheral circuit; Wherein count same number microcontroller chip and peripheral circuit is called the control signal puocessing module, be responsible for the control signal of each cylinder of motor is handled respectively with cylinder; Other has a microcontroller chip and peripheral circuit thereof is administration module, and responsible working state to remaining chip manages and realize the accurate control to the cold-starting unit; Described cold-starting unit comprises fuel identification sensor, temperature transducer, drop tank and petrol pump; Fuel identification sensor, temperature transducer and petrol pump are connected to above-mentioned administration module respectively, and drop tank connects petrol pump.
2. application rights requires the method for 1 described system, it is characterized in that, may further comprise the steps:
The control signal that former car computer sends is admitted to microcontroller after handling through input circlult, microcontroller is handled former car control signal under software control, signal after treatment makes motor obtain enough methanol fuels with proper functioning by output circuit control oil spout performance element; When burning, can make corresponding change to control signal automatically, make the motor proper functioning by hand switch or by the microcontroller chip of being in charge of for gasoline;
The fuel identification sensor is used for discerning the proportioning of methyl alcohol fuel combination in the fuel tank, and test result is passed to microcontroller, and microcontroller is made the delay process of different length to former car control signal according to the different proportionings of methanol fuel; Whether the detection of engine that is used for temperature transducer satisfies the condition of cold-starting, close methanol pump as satisfied then microcontroller, open petrol pump, motor normally starts the back microcontroller and judges whether to be converted to methanol fuel according to temperature, reverse temperature reaches or through controller opens methanol pump after 10 to 60 second time, close petrol pump, return to the methanol fuel situation; After motor quit work, whether microcontroller replaced fuel in the pipeline according to the temperature decision of motor, as reaches the temperature of setting, and then microcontroller open auxiliary oil pump pumps into gasoline in pipeline, and methyl alcohol remaining in the oil supply pipeline is released pipeline; The time that pumps into gasoline preestablishes according to duct length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101116813A CN101280728A (en) | 2008-05-16 | 2008-05-16 | Methanol fuel engine cold-starting control method and system |
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| Application Number | Priority Date | Filing Date | Title |
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| CNA2008101116813A CN101280728A (en) | 2008-05-16 | 2008-05-16 | Methanol fuel engine cold-starting control method and system |
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| CN101280728A true CN101280728A (en) | 2008-10-08 |
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| CNA2008101116813A Pending CN101280728A (en) | 2008-05-16 | 2008-05-16 | Methanol fuel engine cold-starting control method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010060378A1 (en) * | 2008-11-27 | 2010-06-03 | 奇瑞汽车股份有限公司 | Fuel control system for alcohol and gasoline dual-fuel engine and control method thereof |
| CN103089468A (en) * | 2013-01-17 | 2013-05-08 | 李飞 | Cold start controller and cold start method for automobile with methyl alcohol as fuel |
-
2008
- 2008-05-16 CN CNA2008101116813A patent/CN101280728A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010060378A1 (en) * | 2008-11-27 | 2010-06-03 | 奇瑞汽车股份有限公司 | Fuel control system for alcohol and gasoline dual-fuel engine and control method thereof |
| CN103089468A (en) * | 2013-01-17 | 2013-05-08 | 李飞 | Cold start controller and cold start method for automobile with methyl alcohol as fuel |
| CN103089468B (en) * | 2013-01-17 | 2015-06-03 | 李飞 | Cold start controller and cold start method for automobile with methyl alcohol as fuel |
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Open date: 20081008 |