CN101503979A - Control method and apparatus for gasohol flexible fuel engine - Google Patents
Control method and apparatus for gasohol flexible fuel engine Download PDFInfo
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- CN101503979A CN101503979A CNA2009100611057A CN200910061105A CN101503979A CN 101503979 A CN101503979 A CN 101503979A CN A2009100611057 A CNA2009100611057 A CN A2009100611057A CN 200910061105 A CN200910061105 A CN 200910061105A CN 101503979 A CN101503979 A CN 101503979A
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Abstract
The invention discloses a method and a device for controlling a gasoline alcohol flexible fuel engine, wherein the method comprises supply and injection of gasoline and supply and injection of alcohols; the working mode comprises that the engine is started by using a mode of original vehicle gasoline and a gasoline nozzle injects gasoline to keep the engine working normally; when a select switch of the alcohol fuel is closed, an alcohol controller detects the cooling liquid temperature and the engine oil temperature of the engine: if the cooling liquid temperature and the engine oil temperature reach the evaporation point of the alcohols, the alcohol controller starts to receive an oil injection pulse sent by an gasoline controller and convert the oil injection pulse into the injection pulse width of the alcohol fuel; the alcohol controller converts the oil injection pulse into an alcohol injection pulse and controls an alcohol nozzle to work; the modes that the gasoline controller controls the gasoline injection and the alcohol controller controls the alcohol injection are switched in proportion and are performed alternately; and after the alcohol nozzle finishes 8 to 10 seconds of working cycle of the engine through continuous injection, the gasoline nozzle finishes 1 to 2 seconds of working cycle through injection, and the operations are repeated alternately.
Description
Technical field
The present invention relates to a kind of gasohol flexible fuel engine controlling method and device, belong to gasoline and Aalcohols fuel mixed combusting technology.
Background technique
Along with environmental pollution and energy-intensive problem are serious day by day, countries in the world are all at the alternative energy source of actively seeking cleaning, and alcohols is considered to a kind of comparatively ideal clean alternative fuel as a kind of bioenergy that contains oxygen and have recyclability.At present alcohols as an alternative fuel mainly be according to a certain percentage with anhydrous alcohols and gasoline, make alcohol gasoline after adding the additive of hydrotropy.The ratio that this method alcohols is mixed burning is less, and it is limited to substitute amount of gasoline.And the additive cost is higher, can not select suitable alcohols to substitute ratio according to the variation of operating mode during engine operation, makes the combination property of two kinds of fuel can't perform to the best.Current, gasohol fuel combination technology develops to some extent, and Chinese patent CN1766296A " a kind of implementation method and device of realizing Aalcohols fuel and fuel oil dual-fuel internal-combustion engine " has provided a kind of method that realizes gasohol mixed combustion in each stage of automobilism by the ratio of the emitted dose of control fuel nozzle and alcohols nozzle.Existing Chinese patent application 200810046604.4 is to utilize the exhaust heat of motor to flash to gas 65% aqueous alcohol, is restructured as supply engine behind the rich hydrogen mixed gas with catalyzer then.This engine combustion be gasoline or hydrogen-rich gas.Control system is included in the engine exhaust pipe back and has added a reformer, utilizes the exhaust heat hydrogen manufacturing of motor, the supply system of its gas material and CNG motor similar.And gasohol is mixed and is burnt the motor gas of not reforming, and Aalcohols fuel supply system and gas supply system is identical.
The main points of Chinese patent CN1766296A " a kind of implementation method and device of realizing Aalcohols fuel and fuel oil dual-fuel internal-combustion engine " are:
1. be in idling mode behind engine start, the nozzle of controlling fuel oil this moment is controlled the alcohol liquid fuel nozzle to increase the emitted dose of pure class I liquid I simultaneously to reduce the emitted dose of fuel oil.
2. increase the load operation state when motor is in, control fuel nozzle this moment, control the alcohol liquid fuel nozzle simultaneously to reduce the emitted dose of alcohol liquid fuel to increase the emitted dose of fuel oil.
Summary of the invention
The present invention adopts gasoline and alcohols two to overlap independently controller and fuel supply system, selects engine for combusting gasoline or uses gasoline, alcohols fuel combination by diverter switch.Solved the problem of Aalcohols fuel and gasoline indissoluble, and the ratio of motor alternative gasoline of Aalcohols fuel when the flexible fuel pattern can reach more than 90%.
Technological scheme of the present invention: a kind of gasohol flexible fuel engine controlling method, comprise that gas supply and injection and alcohols are supplied with and injection, the mode of operation of flexible fuel is:
(1) start with former car gasoline pattern, former car gasoline controller transmits fuel injection pulse signal according to operating mode to petrol jet, keeps the motor proper functioning;
(2) when the Aalcohols fuel selector switch is closed, alcohol controller detection of engine coolant temperature and oil temperature:
(2.1) if when coolant temperature and oil temperature are lower than the steam point of alcohols, then the gasoline controller continues the work of control petrol jet;
(2.2) when engine coolant temperature and oil temperature reached the steam point of alcohols, alcohol controller began to receive the fuel injection pulse that the gasoline controller sends;
(2.3) alcohol controller converts fuel injection pulse to the alcohols injection pulse, control alcohols nozzle operation;
(3) control gasoline injection of gasoline controller and alcohol controller controls spray alcohols are to switch in proportion to hocket; After alcohols nozzle continuous injection is finished 8～10 seconds work cycle of motor, finish work cycle in 1～2 second, replace so repeatedly by the petrol jet injection.
Described vapour step 2.3) formula of fuel injection pulse being changed the Aalcohols fuel injection pulse width is: T=K* (T1-T2)+T3; Wherein: T represents the Aalcohols fuel injection pulse width, and T1 represents the Fuel Petroleum injection pulse width, and on behalf of petrol jet, T2 open time-delay, and on behalf of the alcohols nozzle, T3 open time-delay; K is the overall conversion factor of substitute fuel.
After described step 3) alcohols nozzle continuous injection is finished 9 seconds work cycle of motor, finish 1 second work cycle, replace so repeatedly by the petrol jet injection.
The double fuel control gear that is used for described controlling method comprises two cover separate fuel supply systems, ejecting system and controller, and the gasoline controller links to each other with datawire with alcohol controller; Engine coolant temperature sensor is connected with alcohol controller with oil temperature sensor, discerns as the alcohols control mode; The gasoline liquid level sensor of two cover fuel supply systems all is connected with fuel selection switch with the alcohols liquid level sensor, and fuel selection switch is connected with a liquid level display; Fuel selection switch is connected with alcohol controller.
Described double fuel control gear, its alcohol controller comprise input signal change-over circuit, A/D converter, microprocessor, output signal change-over circuit four parts that connect successively; The input end of input change-over circuit is connected with cooling-water temperature transmitter, oil temperature sensor, fuel selection switch, and the input change-over circuit is connected with the fuel injection pulse output terminal of gasoline controller; The input change-over circuit carries out filtering, amplification to the signal of each sensor input, through A/D converter to microprocessor; Microprocessor passes to the output signal change-over circuit with signal after signal is carried out computing, storage, and the output signal change-over circuit comprises amplification circuit and change-over circuit, delivers to power unit after converting output signal to executable pulse signal---the alcohols nozzle.
Described double fuel control gear ejecting system adopts the fuel common rail structure, and the fuel common rail flange is fixed between engine cylinder-body and the intake manifold, and many group nozzles are installed on the rail flange altogether; Every group of two nozzles are respectively petrol jet and alcohols nozzle, i.e. alcohols nozzle and gasoline oil spout is arranged between intake manifold and the engine cylinder-body jointly.
Advantage of the present invention is:
1, can substitute gasoline with other fuel, improve energy consumption structure.When using recyclable fuel, also can realize the sustainable development of energy supply.
(as alcohols) can effectively reduce the discharge amount of some noxious emission when 2, using some fuel.
3, the popularization of in fact this motor also can reduce the consumption of gasoline on the whole.Because this motor can substitute gasoline in many applications.
4, can adopt gasoline or alcohols to act as a fuel flexibly.It is low to have the cost of change, and the advantage of stable performance is applicable to the Fuel Petroleum new car or in the transformation with car.
5, gasoline and alcohols all adopt the jet mode fuel feeding.Use pure time-like, burning gasoline is mixed in timesharing, and its advantage is: pure type systematic is not add under former machine is made the situation of any change, if long-term the use, acidic materials wherein can exert an influence to cylinder, valve, lubricant oil.The burning Fuel Petroleum is mixed in timesharing, the residual corrosive material in alcohols burning back in the cylinder " can be washed " to fall more than 95%, has prolonged the working life of motor.
6, gasoline and alcohols at the intake manifold same position (from the angle of motor, be equivalent to same position) spray, its advantage is: arrange that on same cross section 2 nozzle mounting holes can effectively reduce flange thickness, reduce the width of motor on the whole, the layout of motor on car load is more prone to.
7, spray pure time-like, fuel injection pulse is changed the Aalcohols fuel injection pulse width, its advantage is: according to the motor real-time working condition, the Aalcohols fuel of calorific values such as supply and required injected petrol has guaranteed that the power character of motor is unaffected.
8, adopt engine coolant temperature and oil temperature to discern as the alcohols control mode, its advantage is: alcohols can gasify after being injected to intake manifold fast, enter cylinder with air mixing after evenly, make full combustion of fuel, guarantee the power character and the Economy of motor, exhaust contaminant also obviously reduces simultaneously.
9, control gasoline and alcohols interrupted injection, its advantage is: make Aalcohols fuel substitute gasoline to greatest extent, and can not have influence on the working life of motor, reached the purpose of energy saving.
Description of drawings
Fig. 1 is the automatical control system schematic diagram.
Fig. 2 is the flexible fuel engine fuel supply system automatical control system schematic diagram of unifying.
Fig. 3 is the software flow pattern of gasoline controller and alcohol controller.
Embodiment
Further specify embodiments of the present invention below in conjunction with accompanying drawing:
Characteristics of the present invention are to have increased by a cover Aalcohols fuel electric-controlling injection system on the basis of former electric control gasoline engine, or increase by a cover gasoline injection system and an alcohols ejecting system after reducing compression ratio on the basis of spark-ignition engine (CNG) respectively; Two cover systems are respectively by two controller controls, and by the kind that is installed in the fuel selection switch control fuel on the operator cabin inner control panel, it can be the pure gasoline of former car that fuel uses pattern, perhaps gasoline and alcohols timesharing by a certain percentage burning.It is low to have the cost of change, and the advantage of stable performance is applicable to the Fuel Petroleum new car or in the transformation with car.
Fig. 2 is the flexible fuel engine fuel supply system automatical control system schematic diagram of unifying: comprise two cover separate fuel supply systems, ejecting system and controller.
The present invention uses two cover separate fuel supply system and ejecting systems, comprises former car Fuel Petroleum ejecting system and gasoline controller 11; Aalcohols fuel ejecting system and alcohol controller 12, wherein the Aalcohols fuel ejecting system comprises alcohols fuel tank 5, alcohols pump (carrying pressure governor) 7, alcohols liquid level sensor 6, alcohols filter cleaner 8, fuel common rail flange 19 and alcohols nozzle 17, fuel selection switch 9 and the cooling-water temperature transmitter of discerning as control mode 13, oil temperature sensor 14.Petrol tank 1 and alcohols case 5 are separately fixed at vacant place, chassis, and alcohols pump 7 and alcohols liquid level sensor 6 are fixed in the alcohols case 5, and alcohols filter cleaner 8 is fixed on the vehicle frame, and alcohols pump 7 connects with the withstand voltage fast oil pipe of inserting; Fuel common rail flange 19 is fixed between engine cylinder-body and the intake manifold 16, and alcohols oil rail is connected with the withstand voltage fast oil pipe of inserting with alcohols filter cleaner 8; Gasoline liquid level sensor 2 is connected with liquid level display list 10 by fuel selection switch 9 controls with alcohols liquid level sensor 6, the shared oil gauge of two cover systems, 10 indications of liquid level display list was the gasoline liquid level when fuel selection switch 9 switched to the gasoline position, and 10 indications of liquid level display list was the alcohols liquid level when fuel selection switch 9 switched to the alcohols position.
Fig. 1 is the automatical control system schematic diagram:
As Fig. 1: the gasoline controller links to each other with datawire with alcohol controller; Cooling-water temperature transmitter 13 as control mode identification is connected with alcohol controller with oil temperature sensor 14; Alcohol controller comprises input signal change-over circuit, A/D converter, microprocessor, output signal change-over circuit four parts.The input change-over circuit is connected with oil temperature sensor, fuel selection switch with cooling-water temperature transmitter, and the input change-over circuit is that the signal that each sensor is imported is carried out filtering, amplification, and digital to analog converter carries out analog-converted to amplifying signal again; After microprocessor carries out computing, storage by pre-set programs to the analog-converted signal, output signal is passed to the output signal change-over circuit, and pre-set programs is to utilize the corresponding control data MAP figure that develops software and obtain after the various operating modes of vehicle are demarcated with system.The output signal change-over circuit comprises amplification circuit and change-over circuit, delivers to power unit after converting output signal to executable pulse signal---the alcohols nozzle.
Fig. 3 is the software flow pattern of gasoline controller and alcohol controller.
The work characteristics of gasohol flexible fuel engine is: start with former car gasoline pattern, former car gasoline controller transmits different fuel injection pulse signals according to different operating modes to petrol jet, keeps the motor proper functioning.When fuel selection switch places the alcohols position, be sent to microprocessor after by input signal processing circuit in the alcohol controller and analog-converted as the engine coolant temperature sensor 13 of control mode identification, oil temperature sensor 14 detected signals.When detected temperature all reaches the steam point of alcohols, the input signal change-over circuit that the ejection pulse signal that former car gasoline controller 11 is transported to petrol jet 18 is transported to alcohol controller 12 amplifies, Shelving, the data of handling enter A/D converter, again to being transported to microprocessor.Microprocessor calculates the ratio of Aalcohols fuel nozzle orifice coeficient and the petrol jet flow coefficient of gasoline controller control by default program, and then calculate the injection pulse width of Aalcohols fuel, and by the output signal change-over circuit signal is converted into electrical signal then and is transported to power unit---alcohols nozzle 17.
After detecting the alcohols injection signal, former car gasoline controller 11 will close petrol jet 18, but the gasoline controller can constantly be exported the gasoline injection pulsewidth and received by alcohol controller according to the variation of operating mode, and then convert the alcohols injection pulse width to, realized that the real-time control of Aalcohols fuel is sprayed.In order to reduce to use air valve wearing and tearing and the nozzle coking that Aalcohols fuel causes for a long time, adopt the mode of two kinds of nozzle alternations, alcohols nozzle continuous injection is after a period of time, (generally being 8～10 seconds), close the alcohols nozzle again, spray a period of time, (generally being 1～2 second) by petrol jet.Replace so repeatedly.The a small amount of error of Chan Shenging can be proofreaied and correct by closed loop control and adaptive control algorithm by former gasoline controller therebetween, thereby has realized the full cut-off ring control of two kinds of fuel.
The formula of Aalcohols fuel injection pulse width is:
T=K* (T1-T2)+T3; Wherein: T represents the Aalcohols fuel injection pulse width, and T1 represents the Fuel Petroleum injection pulse width, and on behalf of petrol jet, T2 open time-delay, and on behalf of the alcohols nozzle, T3 open time-delay; K is the overall conversion factor of substitute fuel.
Aalcohols fuel comprises:
Gasoline, alcohols flexible fuel engine.
Gasoline, methyl alcohol flexible fuel motor.
The present invention adopts fuel common rail flange realization twin nipple to control at the intake manifold same position.
With ethanol is that the example process is as follows:
1, begin to start with former car gasoline pattern, former car gasoline controller transmits different fuel injection pulse signals according to different operating modes to petrol jet, keeps the motor proper functioning.
2, when fuel selection switch places the alcohols position, whether alcohol controller detection of engine coolant temperature and oil temperature all reach more than 70 ℃.
2.1, if coolant temperature and oil temperature do not reach 70 ℃, then the gasoline controller continues the work of control petrol jet.
2.2, after coolant temperature and oil temperature all reach 70 ℃, alcohol controller begins to receive the fuel injection pulse that the gasoline controller sends;
2.3, alcohol controller converts fuel injection pulse to the alcohols injection pulse, control alcohols nozzle operation; The alcohols nozzle operation is closed petrol jet simultaneously;
3, control gasoline injection of gasoline controller and alcohol controller controls spray alcohols are to switch in proportion to hocket; After alcohols nozzle continuous injection is finished 8～10 seconds work cycle of motor, finish work cycle in 1～2 second, replace so repeatedly by the petrol jet injection.
Two cover systems are respectively by two controller controls, and by the kind that is installed in the fuel selection switch control fuel on the operator cabin inner control panel, it can be the pure gasoline of former car that fuel uses pattern, perhaps gasoline, alcohols timesharing mixed combustion by a certain percentage.
The present invention except cold post-start with the gasoline, all the other times can select to use gasoline or gasoline and alcohols fuel combination arbitrarily.When selecting fuel combination, gasoline and alcohols do not spray simultaneously, belong to timesharing and mix burning, with regard to single cylinder, after the petrol jet continuous injection is finished work cycle in 1 second, just stop to spray, in 9 seconds work cycle next, all finish by alcohols nozzle ejection alcohols.The mixed-fuel burning proportion of alcohols can reach more than 90%.
The electric control system controls mode, controller of the present invention comprises motor gasoline controller and alcohol controller, according to the various signals that collect, after handling, sharing, two cover controller coordinate work, control gasoline and alcohols interrupted injection.
The switch mode of this default is after alcohols nozzle continuous injection is finished 10 seconds work cycle, is sprayed when finishing 1 second work cycle by petrol jet again, and the mixed-fuel burning proportion of alcohols can reach more than 92%.So repeatedly.
The switch mode of this default is after alcohols nozzle continuous injection is finished 8 seconds work cycle, is sprayed when finishing 1 second work cycle by petrol jet again, and the mixed-fuel burning proportion of alcohols can reach more than 85%.So repeatedly.
The switch mode of this default is after alcohols nozzle continuous injection is finished 10 seconds work cycle, is sprayed when finishing 2 seconds work cycle by petrol jet again, and the mixed-fuel burning proportion of alcohols can reach more than 83%.So repeatedly.
The switch mode of this default is after alcohols nozzle continuous injection is finished 8 seconds work cycle, is sprayed when finishing 2 seconds work cycle by petrol jet again, and the mixed-fuel burning proportion of alcohols can reach more than 80%.So repeatedly.
Alcohols nozzle of the present invention and gasoline oil spout are arranged between intake manifold and the engine cylinder-body jointly.
The present invention has increased by a cover Aalcohols fuel electric-controlling injection system on the basis of former electric control gasoline engine, or increases by a cover gasoline injection system and an alcohols ejecting system after reducing compression ratio on the basis of spark-ignition engine (CNG) respectively; Two cover systems are respectively by two ECU controls, and by the kind that is installed in the fuel selection switch control fuel on the operator cabin inner control panel, it can be pure gasoline that fuel uses pattern, perhaps gasoline, alcohols timesharing mixed combustion by a certain percentage.
Core of the present invention is to spray starting condition and gasoline and alcohols interrupted injection alternating spray according to detected engine coolant temperature and oil temperature as alcohols, promptly controls two kinds of fuel timesharing and mixes burning.Therefore, every employing engine coolant temperature and oil temperature spray starting condition and gasoline and two kinds of fuel timesharing of alcohols as alcohols and mix burning, all belong to protection scope of the present invention.
Claims (6)
1. a gasohol flexible fuel engine controlling method comprises that gas supply and injection and alcohols are supplied with and injection, and it is characterized in that: the mode of operation of flexible fuel is:
(1) start with former car gasoline pattern, former car gasoline controller transmits fuel injection pulse signal according to operating mode to petrol jet, keeps the motor proper functioning;
(2) when the Aalcohols fuel selector switch is closed, alcohol controller detection of engine coolant temperature and oil temperature:
(2.1) if when coolant temperature and oil temperature are lower than the steam point of alcohols, then the gasoline controller continues the work of control petrol jet;
(2.2) when engine coolant temperature and oil temperature reached the steam point of alcohols, alcohol controller began to receive the fuel injection pulse that the gasoline controller sends;
(2.3) alcohol controller converts fuel injection pulse to the alcohols injection pulse, control alcohols nozzle operation;
(3) control gasoline injection of gasoline controller and alcohol controller controls spray alcohols are to switch in proportion to hocket; After alcohols nozzle continuous injection is finished 8～10 seconds work cycle of motor, spray the work cycle of finishing 1～2 second, replace so repeatedly by petrol jet.
2. gasohol flexible fuel engine controlling method according to claim 1 is characterized in that: the formula that step (2.3) is changed the Aalcohols fuel injection pulse width with fuel injection pulse is: T=K* (T1-T2)+T3; Wherein: T represents the Aalcohols fuel injection pulse width, and T1 represents the Fuel Petroleum injection pulse width, and on behalf of petrol jet, T2 open time-delay, and on behalf of the alcohols nozzle, T3 open time-delay; K is the overall conversion factor of substitute fuel.
3. gasohol flexible fuel engine controlling method according to claim 1 and 2, it is characterized in that: after step 3) alcohols nozzle continuous injection is finished 9 seconds work cycle of motor, spray the work cycle of finishing 1 second by petrol jet, replace so repeatedly.
4. be used for the double fuel control gear of 1 described controlling method, it is characterized in that: comprise two cover separate fuel supply systems, ejecting system and controller, gasoline controller (11) links to each other with datawire with alcohol controller (12); Engine coolant temperature sensor (13) is connected with alcohol controller (12) with oil temperature sensor (14), discerns as the alcohols control mode; The gasoline liquid level sensor (2) of two cover fuel supply systems all is connected with fuel selection switch (9) with alcohols liquid level sensor (6), and fuel selection switch (9) is connected with a liquid level display; Fuel selection switch (9) is connected with alcohol controller (12).
5. double fuel control gear according to claim 4 is characterized in that: alcohol controller comprises input signal change-over circuit, A/D converter, microprocessor, output signal change-over circuit four parts that connect successively; The input end of input change-over circuit is connected with cooling-water temperature transmitter, oil temperature sensor, fuel selection switch, and the input change-over circuit is connected with the fuel injection pulse output terminal of gasoline controller; The input change-over circuit carries out filtering, amplification to the signal of each sensor input, through A/D converter to microprocessor; Microprocessor passes to the output signal change-over circuit with signal after signal is carried out computing, storage, and the output signal change-over circuit comprises amplification circuit and change-over circuit, delivers to power unit after converting output signal to executable pulse signal---the alcohols nozzle.
6. according to claim 4 or 5 described double fuel control gear, it is characterized in that: ejecting system adopts the fuel common rail structure, and fuel common rail flange (19) is fixed between engine cylinder-body and the intake manifold (16), and rail flange (19) is gone up many group nozzles are installed altogether; Every group of two nozzles are respectively petrol jet (18) and alcohols nozzle (17), i.e. alcohols nozzle and gasoline oil spout is arranged between intake manifold and the engine cylinder-body jointly.
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| CN101818695A (en) * | 2010-03-25 | 2010-09-01 | 艾希波 | Method for refitting and controlling methanol/gasoline dual-fuel control system of new-energy automobile |
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