CN101255836A - Supply method and system for intelligent control of gasoline engine fuel oil - Google Patents
Supply method and system for intelligent control of gasoline engine fuel oil Download PDFInfo
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- CN101255836A CN101255836A CNA2008100547747A CN200810054774A CN101255836A CN 101255836 A CN101255836 A CN 101255836A CN A2008100547747 A CNA2008100547747 A CN A2008100547747A CN 200810054774 A CN200810054774 A CN 200810054774A CN 101255836 A CN101255836 A CN 101255836A
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Abstract
The present invention relates to a method and system for controlling intelligently fuel supply by gasoline engine. The fuel system comprises an oil pump, an injection guide, a pressure reflux valve, a gasoline tank, a check valve and an oil supply and return pipeline. Wherein, a pressure sensor and an intelligence controller, a transmitting bus, a sound and light alarm circuit are increased. After calculating and judging of control software of microprocessor of intelligence controller, outputs a certain pressure to the oil pump engine, at the same time, the microprocessor detects pressure signal of pressure sensor amends voltage transmitted to the oil pump motor at any moment according to the pressure signal to remain stabilization of system pressure, and detecting, judging problems resisted in fuel supply system to give off sound and light alarm in time. The present invention saves energy, reduces consume, can detect fuel supply system intelligently and determine faults and alarm, enhances the initiative safety of vehicle on moving.
Description
Technical field
The invention belongs to the petrol engine oil supply system, specifically petrol engine intelligent controlled fuel oil supply method and system.
Background technique
Automobile is entering our society and family with very fast speed.The performance of automobile, oil consumption etc. more and more are being subjected to people's attention.People's effort is carried out the research of saving energy and reduce the cost, reduce pollution, protection environment of automobile in all its bearings.By our careful analysis and research, automobile fuel pump also is one of equipment fuel consume, very important.
At present, along with the development of automotive engineering, the automobile of nearly all Fuel Petroleum has all used EFI fuel delivery technology, and basic demand of EFI fuel oil technology is exactly at the oil nozzle front end, and certain fuel pressure is provided.Owing in the early stage that electric jet technology begins to use, when the design of stablizing fuel pressure is provided, adopted mechanical pressure regulator valve scheme.In order to guarantee under various operating modes, the fuel pressure that the oil nozzle end is stable, this scheme needs oil pump to provide amount of fuel by the operating mode of maximum fuel needs.For example: design maximum fuel delivery volume is 100 liters/hour, and then fuel pump is just necessary constantly by 100 liters/hour flow work, can meet the requirements of power when starting, upward slope, the anxious acceleration so that guarantee vehicle.And in most cases, automobile is not to be operated under the operating mode of maximum fuel consumption.For example: automobile travels with 100 kilometers the fuel consumption of 15 liters of speed, per 100 km oil consumption per hour, just: automobile is 15 liters of oil consumptions per hour, according to design, the oil pump of this car, per hour at least 100 liters fuel oil is provided, 85 liters of extra oil all will flow back in the fuel tank by return tube again except 15 liters of oil that automobile running will consume! These 85 liters of oil are exactly the idle work that oil pump is done! In addition, in urban transportation, automobile often will stop, and waits red light, dodges situation such as pedestrian, and at this moment, the general about oil consumption hourly of automobile is about 1 liter, and unnecessary 99 liters of oil that go out also will flow back in the fuel tank by return tube.Mechanical pressure regulator valve design proposal, a basic prerequisite: oil pump will provide the fuel oil that substantially exceeds required fuel injection quantity at ordinary times, could guarantee: under any shape, the oil nozzle place keeps needed fuel pressure.So when dispatching from the factory design, oil pump is designed to full-speed operation, keeps required pressure by pressure regulator valve, this will provide to substantially exceed required fuel supply volume under nominal situation.
For automobile, as long as engine start, oil pump will full-speed operation, the idle work that those fuel oils that pump are done more will consume suitable electric power, and we know, all energy on the automobile all come the spontaneous combustion fuel oil to obtain, so also just wasted a certain amount of fuel oil.
The fuel delivery of the oil pump of general compact car rises above (the vehicle requirement that has is more than 150 liters) at 60-90 per hour, and the fuel consumption of general vehicle under nominal situation, per hour in 1 liter-20 liters.Like this, a large amount of fuel oils is just arranged, after turning around, got back to fuel tank again, make oil pump do a large amount of idle works, consumed lot of energy through the pumping of oil pump.And,, also accelerated the wearing and tearing of oil pump, the working life of having reduced oil pump because oil pump runs up always.
Summary of the invention
The present invention is different from the existing petrolic fuel supply system control technique of unifying, its objective is the design a kind of can be according to the needs of fuel consumption, stable fuel pressure is provided, reduce unnecessary fuel flow returns, reduce the idle work that oil pump is done, reduce the consumption of energy, the wearing and tearing of minimizing oil pump, reduce running noises, improve the petrol engine intelligent controlled fuel oil supply method and system of the active safety of vehicle operating.
To achieve these goals, technological scheme of the present invention is:
A kind of petrol engine intelligent controlled fuel oil supply method adopts oil pump, oil spout guide rail, pressure reflux valve, fuel tank, one-way valve and confession, return line to form fuel oil supply system; It is characterized in that: in the pipeline of oil pump and oil spout guide rail, adorn pressure transducer, and use intelligent controller, transfer bus, sound light alarming circuit; Described intelligent controller is made up of motor, microprocessor, the input signal circuit of mu balanced circuit, overcurrent protector, drive circuit, oil pump; When opening ignition switch, the control signal that engine electronic control unit ECU provides, through the input signal circuit, send in the microprocessor, through the calculating of control software, the judgement of microprocessor, to the certain voltage of Oil pump electrical machinery output, simultaneously, the pressure signal on the microprocessor detected pressures sensor, and according to this pressure signal, at any time revise the magnitude of voltage that is transported to Oil pump electrical machinery, what keep-up pressure is stable; When microprocessor detects, judges the fuel oil supply system existing problems, after the bus level conversion,, send warning message to sound light alarming circuit through transfer bus, sound light alarming circuit can in time send the acoustooptic alarm signal according to warning message.
Described acoustooptic alarm part is to be inserted by transfer bus, behind electrical level conversion circuit, is connected in the acoustooptic alarm microprocessor, and the acoustooptic alarm microprocessor is through handling, and the output voice signal outputs to loudspeaker through amplifier and constitutes.Described sound light alarming circuit according to the failure code information of being sent by intelligent controller, through the processing of acoustooptic alarm microprocessor, is lighted corresponding trouble light, and simultaneously with voice signal process amplifier, is transported in the loudspeaker warning of sounding.
In described return line, dress pressure control reflux valve between oil spout guide rail and the fuel tank, the valve of described pressure control reflux valve are to be opened and closed by the charge oil pressure control of oil pump output.
The control procedure of the control software of the microprocessor of described intelligent controller is:
A, at first installs system, and after logical the powering on, program is carried out the operation of initialization S0 frame; Initialization is finished, and carries out the ignition key switch status detection of S1 frame;
Do you B, judge that ignition key switch opens?, then do not carry out static pressure and change the operation that detects S7; According to the situation of variance ratio, carry out judging whether system exists the S8 of leakage to calculate; If judge and think, there is the situation of leaking, the S9 operation of then reporting to the police and preparing; After finishing S9 operation, if or judge and think that not, return information is carried out ignition key switch and whether opened judgement;
Be, then carry out the S2 operation, be written into the relevant parameter of adjusting,,, send warning message to acoustooptic alarm system then by bus if find to have leak flag simultaneously;
C, finish after the aforesaid operations, program enters main program part S3, S4, the S5 of intelligent control process;
In main program, detect fuel pressure in real time, press the operation of S3 frame and according to the pressure trend situation, in time adjust the pulse width of exporting to Oil pump electrical machinery, press the operation of S4 frame, change the rotating speed of oil pump, fuel pressure is remained in the desired pressure range;
D, judge whether oil-fired system work is normal, is, then only carry out the operation of above-mentioned S3, S4, S5;
Not, find that there are abnormal conditions in fuel oil supply system, then carry out anomaly analysis immediately; And, return simultaneously and carry out main program part S3, S4, S5 according to the failure cause transmission warning message of analyzing.
There are abnormal conditions in the fuel oil supply system of finding, have following several former because:
● the oil pump serious wear, near working life;
● there is serious leakage in oil-fired system;
● the shortage of fuel tank intermediate fuel oil;
A kind of intelligent controlled fuel oil supply system of gasoline engine comprises oil pump, oil spout guide rail, fuel tank, one-way valve and confession, return line, it is characterized in that: also comprise intelligent controller and pressure transducer, the pressure control reflux valve; Described pressure transducer is loaded in the pipeline of oil pump and oil spout guide rail, pressure transducer is connected with the input terminal of intelligent controller by cable, pressure transducer is monitored the fuel pressure in the oil supply system in real time, and fuel pressure is converted to electrical signal inputs to intelligent controller; The output port of described intelligent controller is connected to the motor power supply terminal of oil pump by elastic cable paper, microprocessor in the intelligent controller is according to the fuel pressure of monitoring in real time in the oil supply system, control software by microprocessor carries out data processing, the rotating speed of control oil pump, make oil pump that the fuel oil of different amounts is provided, keep required, stable fuel pressure on the fuel delivery loop; Reach when detecting, judging the fuel oil supply system existing problems, send alarm signal, in time send acoustooptic alarm information by warning circuit to warning circuit.
Described intelligent controller is made up of mu balanced circuit, overcurrent protector, drive circuit, Oil pump electrical machinery, microprocessor, input signal circuit, bus level change-over circuit and warning circuit; The control signal that the pressure signal of described input signal circuit incoming pressure sensor and engine electronic control unit ECU provide, the input signal circuit connects microprocessor, microprocessor connects sound light alarming circuit by output port, message transfer bus, and the output port of microprocessor connects and the controlling and driving circuit; Drive circuit connects and the driving Oil pump electrical machinery; Described mu balanced circuit connects simultaneously and gives input signal circuit, pressure transducer, microprocessor power supply, overcurrent protector of described drive circuit series connection, and by direct power supply power supply.
Described pressure reflux valve is a kind of pressure control reflux valve, the pressure control reflux valve comprises filler opening and oil outlet on valve body, the valve body, the valve in the valve body and cooperation valve port, expansion capsule and the pressure control filler opening of expansion capsule, and valve port communicates with oil outlet; Described expansion capsule is contained in the valve body, and contacts with valve, and under the effect of the oil pressure in the expansion capsule, the expansion tube squeezing valve is opened, after expansion capsule oil pressure descends, and valve closing; Described pressure control filler opening is connected with the oil pipe of oil pump output.
Petrol engine intelligent controlled fuel oil supply method and system of the present invention are compared with existing method, have following advantage:
1, it is that the microelectronic technology that combines the modern times, the microprocessor of employing high anti-interfering performance are core, be to detect fuel pressure in real time with advanced fuel pressure transmitter, by accurate calculating, control the running speed of oil pump automatically, make fuel pressure keep stable.
2, in order to guarantee other performances of automobile, still will keep certain recirculating oil quantity, but this recirculating oil quantity approximately per hour only needs to have significantly reduced unnecessary consumption below 5 liters,
3, can greatly reduce the wearing and tearing and the operation noise of oil pump, the working life of improving oil pump.
4, have Intelligent Measurement to fuel oil supply system, fault verification and warning function have improved the active safety of vehicle operating.
The present invention is through being installed on the automobile actual test, the actual power that oil pump consumes, and than original 1/4 also low, this has just significantly reduced the energy consumption of Oil pump electrical machinery.With the Xiali car is example, power is 80 watts during the Oil pump electrical machinery full-speed operation, now by 25% original calculating, only consume 20 watts, reduced 60 watts, (being equivalent to close one) as long as engine start, the distance head lamp of light yellow always just, work every day by the Xiali car and to calculate in 3 hours, 0.18 degree electricity can be saved every day,, 0.063 liter of oil can be saved every day by every liter of oil 2.86 degree that can generate electricity.Can save 1 liter of oil in promptly 16 days! Though how big this be not a number, accumulates over a long period, the energy that the whole nation, the whole world are saved is just considerable.
The petrol pump life-span improves: we know from stand test, and the power consumption of oil pump is directly proportional with pump speed, and we learn from the mechanics of materials, the stress cycle fatigue wear also is directly proportional with rotating speed, so, the wear-out life of petrol pump has just improved 3 times, is original more than 4 times.
In addition, according to investigation on the net, the damage of oil pump, quite a few is arranged is because fuel tank intermediate fuel oil deficiency, oil pump be in half immerse in the oil, abundant pump oil, also just can not realize allowing fuel oil take away the designing requirement of Oil pump electrical machinery generation heat, oil pump is burnt.Use petrol engine fuel delivery intelligence control method of the present invention, can find the problems referred to above immediately, in time stop the work of oil pump, can prevent this class unnecessary loss effectively.
Other reduce such as fuel vapor leakage, hot driving and noise, and effect is significantly, does not just have the research that quantizes.
Description of drawings
Fig. 1 is that intelligent controlled fuel oil supply system of gasoline engine is formed schematic representation;
Fig. 2 is the schematic block circuit diagram of intelligent controller;
Fig. 3 is the circuit diagram of intelligent controller;
Fig. 4 is the circuit block diagram of acoustooptic alarm part;
Fig. 5 is the control main program flow block diagram of intelligent controller;
Fig. 6 is the pass closed state principle schematic of balloon type pressure control reflux valve;
Fig. 7 is the unlatching attitude principle schematic of balloon type pressure control reflux valve;
Fig. 8 is telescopic pressure control reflux valve structural representation;
Fig. 9 is the attached plan view of telescopic pressure control reflux valve.
Embodiment
Below in conjunction with accompanying drawing with regard to embodiment be elaborated (present embodiment is to further specify of the present invention, rather than any qualification that the present invention has been done).
One, intelligent controlled fuel oil supply system of gasoline engine of the present invention is formed
Shown in Figure 1, intelligent controlled fuel oil supply system of gasoline engine is formed schematic representation; Intelligent controlled fuel oil supply system of gasoline engine comprises oil pump 11, intelligent controller 12 and pressure transducer 13, oil spout guide rail 14, message transfer bus 10, acoustooptic alarm part 15, pressure control reflux valve 16, fuel tank 17, one-way valve 18 and confession, return line; Described pressure transducer is loaded in the pipeline of 14 sections on oil spout guide rail of 16 of one-way valve and pressure control reflux valves, pressure transducer is connected with the input terminal of intelligent controller by cable, pressure transducer is monitored the fuel pressure in the oil supply system in real time, and fuel pressure is converted to electrical signal inputs to intelligent controller; The output port of described intelligent controller is connected to the motor power supply terminal of oil pump by elastic cable paper, after the microprocessor data of intelligent controller is handled, according to the fuel pressure in the real-time monitoring oil supply system, judgement by intelligent controller is calculated, motor output control corresponding voltage to oil pump, with the rotating speed of control oil pump, make oil pump that the fuel oil of different amounts is provided, keep required, stable fuel pressure on the fuel delivery loop.Pressure control reflux valve 16 is loaded in the return line between oil spout guide rail 14 and the fuel tank 17, is connected the pressure control mouths of pressure control reflux valves before the one-way valve 18 by oil pipe 4, the valve open that comes pilot pressure control reflux valve by the output oil pressure of oil pump with close.The output port of intelligent controller 12 joins by message transfer bus 10 and acoustooptic alarm part 15, partly sends the failure alarm signal that intelligent controller 12 detects by acoustooptic alarm.
Shown in Figure 2, the schematic block circuit diagram of intelligent controller of the present invention.Intelligent controller 12 is made up of motor 24, microprocessor 25, input signal circuit 26, the sound light alarming circuit 27 of mu balanced circuit 21, overcurrent protector 22, drive circuit 23, oil pump; The control signal that the pressure signal of described input signal circuit 26 incoming pressure sensors and engine electronic control unit ECU provide, the input signal circuit connects microprocessor, output end of microprocessor mouth connecting bus electrical level conversion circuit, and join with message transfer bus and warning circuit, microprocessor connects sound light alarming circuit by output port, message transfer bus, and the output port of microprocessor connects and the controlling and driving circuit; Drive circuit connects and the driving Oil pump electrical machinery; Described mu balanced circuit connects simultaneously and gives input signal circuit, microprocessor power supply, over-voltage and over-current protector of described drive circuit series connection, and by direct power supply power supply.
Shown in Figure 3, the circuit diagram of intelligent controller.
Be divided into following several module according to function, the with dashed lines frame goes out respectively.
Each composition of voltage-stabilized power supply circuit 21 wherein, over-current protection circuit (FS) 22, drive circuit 23, microprocessor 25 and bus level change-over circuit TX, input signal circuit 26 and acting as:
+ B is connected on the power supply of normal open electricity, insert by socket J4, + VB also is the permission oil pump work whether signal level that controller will detect for the power supply of the next supply oil pump work of engine electronic control unit ECU, and power supply inserts by socket J0;
Input signal circuit 26: form the supply voltage that is used for the supply oil pump work that the engine electronic control unit ECU with+VB input comes by photo coupler U2, resistance R 7, capacitor C 2 etc., be transformed to the adaptable level signal of microprocessor IC1, the light-emitting diodes pipe end of photo coupler U2 be connected with current-limiting resistance R7 and smoothing capacity C2; The level signal of engine electronic control unit ECU is delivered to after the conversion among the microprocessor IC1; The output line of pressure sensor part YL is connected on the pin 3 of microprocessor 25, and pressure sensor part YL power supply source line is connected on the power supply VCC that mu balanced circuit 21 provides;
Voltage-stabilized power supply circuit 21: the input end of mu balanced circuit is connected on the power supply+B of normal open electricity, by being connected with integrated regulator IC2 behind the diode D1, the output terminal of integrated regulator IC2 is that a galvanic current is pressed VCC, this end connects and pressure sensor part A, input signal circuit 26, microcontroller circuit 25, for this three partial circuit provides stabilized power source, electrochemical capacitor E2, E3, capacitor C 10 be mu balanced circuit move back the lotus root filter element, connect grounding end VSS respectively with input, output terminal and the controller of integrated regulator IC2;
Microprocessor 25: 1 pin of microprocessor IC1 meets power supply VCC, pin 2 earth levels, pin 3 is set to signal input part, and is connected to the output signal end of pressure transducer, the output signal of pressure transducer is after modulus A/D conversion, and microprocessor IC1 detects fuel pressure; Pin 6 is set to add electric signal input end, be connected on the output terminal of photo coupler U2, be used for monitoring the supply voltage that engine electronic control unit ECU supplies with oil pump work, just allow oil pump work whether signal, pin 6 connects level pull down resistor R3, and connects grounding end VSS; Pin 7 is arranged to input end, on the receiving terminal pin 2 among connection and the bus level change-over circuit TX, is used for receiving other information that transmit on the bus, level pull-up resistor R1; Pin 2 is set to into output terminal, on the transmitting terminal pin 1 in connection and the bus level change-over circuit (TX) 28, is used for sending on bus and reports to the police and fault message; Pin 5 is set to output terminal, is connected with the input end of drive circuit 23; Bus level change-over circuit (TX) is output as socket J4;
Described microprocessor is the core component of intelligent controller, and the control main program of intelligent controller just is installed in the chip of microprocessor, and microprocessor can be done relevant detection and output control according to the requirement of control main program.This components and parts can be any one monolithic microprocessors that meets the demands.What select for use in the embodiments of the invention is a microprocessor chip of Microchip company.
Described microprocessor output frequency is constant, the pulse signal of pulse width variation, is used for controlling the rotating speed of Oil pump electrical machinery;
Drive circuit 23: the two-stage amplification circuit by triode Q1, field effect transistor Q2 is formed, the input end triode Q1 base stage of amplification circuit is exported an end pin 5 through build-out resistor R13 and microprocessor IC1 and is connected, the emitter of triode Q1 links to each other with grounding end VSS, the current collection of triode Q1 is output terminal and in parallel with load resistance R8 and build-out resistor R10 very, another termination+VB of load resistance R8; Resistance R 10 connects the grid of next stage amplification circuit field effect transistor Q2, the source electrode of field effect transistor Q2 connects the motor of oil pump by gang socket J1, connect the power supply+VB of the supply oil pump work that Engine ECU come, i.e. socket J0 by the drain electrode of field effect transistor Q2 through overcurrent protective circuit (FS) 22; Simultaneously, at the drain electrode parallel voltage-stabilizing diode D3 of field effect transistor Q2 negative pole end, reference diode D3 positive terminal connects field effect transistor Q2 drain electrode, and this reference diode D3 is the components and parts of protection field effect transistor Q2;
The positive pole of diode D2 connects the motor ground end VSS of oil pump, negative pole connects the grid output terminal of field effect transistor Q2 and the motor positive terminal of oil pump, and connect the capacitor C 6 between ground level and the field effect transistor Q2 grid output terminal, and join with the resistance R 9 that is together in series, capacitor C 7, resistance R 9, capacitor C 7 connect the grid of field effect transistor Q2, electrochemical capacitor E1 be connected and the motor ground of power supply+VB and oil pump end VSS between, electrochemical capacitor E1 is+the VB power supply move back lotus root electric capacity;
Described R9, C7 series circuit improve output waveform to be used, and described diode D2 is used for subduing the inverse electromotive force that Oil pump electrical machinery produces, and has the effect that certain elimination Oil pump electrical machinery disturbs; Described socket J1 is the output terminal of intelligent controller, and the output terminal of intelligent controller drives the motor (24) of oil pump, and the voltage of different equivalent value is provided;
Over-current protection circuit (FS) 22: over-current protection circuit (FS) 22 is connected between power supply+VB and field effect transistor Q2 drain electrode;
When oil pump and interlock circuit occur unusually, make supply current increase to specified value when above, power supply is cut off in the overcurrent protector FS action of controller, to protect relevant device, avoids further loss.After fault was got rid of, and operating current returns in the specified value, the overcurrent protector of controller (FS) 22 recovered conducting, makes the system recovery proper functioning.
Because different communication transfer bus, different level requirements is arranged, it is exactly that operation level with microprocessor IC1 is converted to the needed level signal of other buses, as: CAN, Lin bus, serial type interface RS-485, RS-232 or other information transmission mode bus.
Shown in Figure 4, the circuit block diagram of acoustooptic alarm part.Sound light alarming circuit connects acoustooptic alarm microprocessor 32 by electrical level conversion circuit 31, the output of acoustooptic alarm microprocessor connects speech signal amplifier 33, and speech signal amplifier 33 connects the tutorial light that is connected to separately with loudspeaker 34, other port and constitutes.After sending the code information of being out of order by intelligent controller, after the conversion through acoustooptic alarm bus level change-over circuit 31 partly, with information conveyance in signal acoustooptic alarm microprocessor 32, acoustooptic alarm microprocessor 32 is encoded according to information, light corresponding trouble light, carry out photoelectric alarm, and simultaneously with voice signal process amplifier 33, be transported in the loudspeaker 34 warning message of sounding.Warning light can be set at Chang Liang, up to closing key operation; Loudspeaker broadcast can be set at 1 time, 2 times, or the like.The acoustooptic alarm part can be placed in the conspicuous position or instrument panel that does not influence driving.
Shown in Figure 5, program flow chart of the present invention.Be the control software in the microprocessor of intelligent controller.Its control procedure is:
A, at first, install system after, in the circuit diagram of intelligent controller as shown in Figure 3 ,+B is logical power on after, program is carried out the operation of initialization S0 frame; Initialization is finished, and carries out the ignition key switch status detection of S1 frame;
Do you B, judge that ignition key switch opens?, then do not carry out static pressure and change the operation that detects S7; According to the situation of variance ratio, carry out judging whether system exists the S8 of leakage to calculate; If judge and think, there is the situation of leaking, the S9 operation of then reporting to the police and preparing; After finishing S9 operation, if or judge and think that not, return information is carried out ignition key switch and whether opened judgement;
Be, then carry out the S2 operation, be written into the relevant parameter of adjusting,,, send warning message to acoustooptic alarm system then by bus if find to have leak flag simultaneously;
C, finish after the aforesaid operations, program enters main program part S3, S4, the S5 of intelligent control process;
In main program, detect fuel pressure in real time, press the operation of S3 frame and according to the pressure trend situation, in time adjust the pulse width of exporting to Oil pump electrical machinery, press the operation of S4 frame, change the rotating speed of oil pump, fuel pressure is remained in the desired pressure range;
D, judge whether oil-fired system work is normal, is, then only carry out the operation of above-mentioned S3, S4, S5;
Not, find that there are abnormal conditions in fuel oil supply system, then carry out anomaly analysis immediately; And, return simultaneously and carry out main program part S3, S4, S5 according to the failure cause transmission warning message of analyzing.
Above-described fuel oil supply system exists when unusual, carries out anomaly analysis immediately, and abnormal conditions have following several reason:
● " oil pump serious wear; ": when controller is that oil pump output is near maximum output voltage and when continuing for some time near working life, if it is approaching with the mean value of controller record, static leakage inspection simultaneously is normal, show the oil pump serious wear, pump oil efficient reduces, oil pump near having scrapped, then can provide this warning message;
● " may there be serious leakage in oil-fired system; please check as early as possible ": when controller is the maintenance fuel pressure, export near the maximum output voltage value to oil pump, and when continuing for some time, if the mean value that writes down with controller differs greatly, static leakage inspection is simultaneously also found to have leakage, then can provide this warning message; In order to prevent to reveal the bigger loss that causes vehicle, personnel's property, protect oil pump, control program can according to circumstances stop to the oil pump power supply thereafter, after, when each ignition switch is opened, carry out the same adjustment of S3-S5, detection and circulation.
● " fuel oil may shortage, please check as early as possible ": when controller is that oil pump output is near maximum output voltage and when continuing for some time, if differ big with the value of controller record, static leakage inspection simultaneously is normal, then can provide this warning message.In order to protect oil pump, control program can according to circumstances stop to the oil pump power supply thereafter, after, when each ignition switch is opened, carry out the same adjustment of S3-S5, detection and circulation.
Fig. 6 is the principle schematic of pressure control reflux valve to shown in Figure 9.Employed pressure reflux valve 16 is a kind of pressure control reflux valves among the present invention, the pressure control reflux valve is loaded in the return line between oil spout guide rail 14 and the fuel tank 17, from the one-way valve 18 preceding pressure control mouths that connect the pressure control reflux valves by oil pipe 4, come the backflow of pilot pressure control reflux valve to open and close by the oil pump delivery pressure, control the size (seeing Fig. 8,9) of capacity of reflux by the capacity of reflux adjusting screw at oil outlet place.
The pressure control reflux valve comprises filler opening 162 and oil outlet 163, the valve 164 in the valve body and the pressure control filler opening 167 that cooperates valve port 165, expansion capsule 166 and expansion capsule on valve body 161, the valve body, and valve port communicates with oil outlet; Described expansion capsule is contained in the valve body, and with valve contact or is connected, under the effect of the oil pressure in the expansion capsule, the expansion tube squeezing valve is opened, after the decline of expansion capsule oil pressure, and valve closing; Described pressure control filler opening is connected with the oil pipe of oil pump output.Wherein the pressure control reflux valve has two kinds of forms:
(1), the expansion capsule is ball shape, valve 164 is hinged in the valve body, valve is equipped with spring 168, as shown in Figure 6 and Figure 7 on valve plate and between valve body on valve port 165.
(2), expansion capsule 166 is the folded shape of annulus, and be contained in the valve port 165, valve 164 is disjunctors with the folded shape expansion capsule 166 of annulus, the expansion capsule directly is enclosed within on the control filler opening 167, oil outlet 163 outlet ports are provided with flow adjustment screw 169, and the rotation adjusting screw can be regulated the oil return flow of fuel oil.As Fig. 8 and shown in Figure 9.
Two, petrol engine intelligent controlled fuel oil supply method of the present invention
Petrol engine intelligent controlled fuel oil supply method of the present invention is the above-described oil pump 11 of employing, oil spout guide rail 14, pressure control reflux valve 16, fuel tank 17, one-way valve 18, adorns pressure transducer 13 in the pipeline of oil pump and oil spout guide rail, and uses intelligent controller 12, message transfer bus 10, sound light alarming circuit 15; Reach confession, return line composition oil-fired system, as shown in Figure 1.
When opening ignition switch, the control signal 19 that engine electronic control unit ECU provides, through the input signal circuit, send in the microprocessor, through the calculating of control software, the judgement of microprocessor, to the certain voltage of oil pump output, simultaneously, the pressure signal on the microprocessor detected pressures sensor, and according to this pressure signal, at any time revise the magnitude of voltage of the motor that is transported to oil pump, what keep-up pressure is stable; When microprocessor detects, judges the fuel oil supply system existing problems, send warning message to sound light alarming circuit, after intelligent controller is sent the code information of being out of order, after the conversion through acoustooptic alarm bus level change-over circuit 31 partly, with information conveyance in acoustooptic alarm microprocessor 32, the acoustooptic alarm microprocessor is encoded according to information, lights corresponding trouble light, sends photoelectric alarm information; And, be transported in the loudspeaker 34 warning message of sounding simultaneously with voice signal process amplifier 33.
The basic functional principle of intelligent controller: intelligent controller is made up of motor 24, microprocessor 25, the input signal circuit 26 of mu balanced circuit 21, overcurrent protection 22, drive circuit 23, oil pump, as shown in Figure 2.
When opening ignition switch, engine electronic control unit ECU can provide control signal corresponding, through input signal circuit 26, send in the microprocessor 25, calculating through microprocessor 25, judge, the certain adjustable voltage of pulsewidth of motor 24 outputs to oil pump, pressure signal on the while microprocessor 25 detected pressures sensors 13, and according to this pressure signal, at any time revise the pulse width that is transported to oil pump 24, also promptly change the equivalent voltage value on the oil pump, make pump speed generation respective change, the corresponding pump oil mass of adjusting oil pump makes the stable fuel pressure that keeps setting in the fuel oil supply system.When microprocessor 25 detects, judges the fuel oil supply system existing problems, can pass through the message transfer bus, send warning message to sound light alarming circuit 27, sound light alarming circuit 27 can in time send the acoustooptic alarm signal according to warning message.Sound light alarming circuit 27 is independently circuit, and it can be installed in the correct position in the operator cabin, makes the driver can easily listen, see relevant warning message.
Mu balanced circuit 21 makes the under any circumstance stable work of intelligent controller for intelligent controller partly provides electric power stable, that isolate interference.
Overcurrent protection (FS) the 22nd, when preventing that other fortuitous event such as short circuit, overcurrent from appearring in circuit, protection intelligent controller and other relevant device avoid further taking place other severe impairment.
The typical operation of petrol engine fuel delivery intelligent control system of the present invention is as follows:
When engine operation, engine electronic control unit ECU can send oil pump and open " Engine ECU control signal 19 ", intelligent controller 12 is after receiving this ECU control signal 19, can start oil pump 11 immediately starts working, begin simultaneously to detect fuel pressure transmitter 13, judge whether fuel pressure reaches the regulation requirement.
If fuel pressure is higher than specified value, intelligent controller 12 can reduce the voltage of supplying with oil pump 11, the rotating speed of oil pump 11 is reduced, fuel pressure near and reach in the process of specified value, intelligent controller 12 can be according to ratio, integration, the algorithm of differential (PID), reduce to supply with the voltage of oil pump 11 gradually,, make fuel pressure reach specified value fast and tend towards stability to reduce pump speed.
If fuel pressure is lower than specified value, controller 12 can be supplied with oil pumps 11 higher voltage, and oil pump 11 rotating speeds are increased rapidly, make fuel pressure rapidly near and reach the numerical value of regulation.
In engine working process, the oil nozzle of motor can be according to driver's operation and engine operating condition requirement, constantly change fuel injection quantity, this variation can make fuel pressure generation minor variations simultaneously, in this process, intelligent controller 12 is this variation in pressure of monitoring in real time, and,, in time adjust the voltage of supplying with oil pump 11 according to the PID regulation scheme of setting according to the situation that fuel pressure changes, make pump speed do corresponding variation, keep fuel pressure to be stabilized in certain scope.
In engine working process, if intelligent controller 12 is found: in a period of time, the voltage of Oil pump electrical machinery is near the above voltage of predefined ceiling voltage, is difficult to keep the fuel pressure stipulated simultaneously, so just illustrates to have fault in the oil-fired system.At this moment intelligent controller 12 can draw following several possible failure cause by analysis and judgement, and with the mode call user's attention of acousto-optic hint, stops the motor power supply to oil pump in case of necessity, to guarantee the safety of the vehicle and the person.
● " oil pump is near damaging; please check as early as possible ": when intelligent controller 12 is exported near maximum output voltage for oil pump and continued for some time, if it is approaching with the average voltage level of intelligent controller 12 record, static leakage inspection simultaneously is normal, show the oil pump serious wear, pump oil efficient reduces, oil pump near having scrapped, then can provide this warning message, changes to remind user's on-call maintenance;
● " may there be serious leakage in oil-fired system; please check as early as possible ": when intelligent controller 12 is the maintenance fuel pressure, export near the maximum output voltage value to oil pump, and when continuing for some time, if the average voltage level that writes down with intelligent controller 12 differs greatly, static leakage inspection is simultaneously also found to have leakage, then can provide this warning message; In order to prevent to reveal the bigger loss that causes vehicle, personnel's property, protect oil pump, controller 12 can according to circumstances stop to the oil pump power supply afterwards, in order not influence the operation of vehicle, when each ignition switch is opened, carries out similar detection and circulation.
● " fuel oil may the shortage; please check as early as possible ": when intelligent controller 12 in the course of the work, after a certain moment, for the output of the motor of oil pump near maximum output voltage and when continuing for some time, if the average voltage level that writes down with controller differs big, static leakage inspection simultaneously is normal, then can provide this warning message.In order to protect oil pump, intelligent controller 12 can according to circumstances stop the motor power supply to oil pump thereafter, in order not influence the operation of vehicle, when each ignition switch is opened, carries out similar detection and circulation
After motor quits work, intelligent controller 12 also can be monitored the fuel pressure of fuel oil supply system, surpass specified value if find the pressure rate of descent, show to exist in the oil supply system loop and leak, can be when ignition switch be opened, remind the driver with acousto-optic: " may there be leakage in fuel oil supply system, please in time overhauls ".
Its alarm failure code information can be passed through message transfer bus 10, sends acoustooptic alarm part 15 to or other need the place of this information.Acoustooptic alarm part 15 can be placed in the suitable place in the operator cabin, and the mode of utilizing voice that the people speaks and tutorial light to show is in time reminded to the driver and checked maintenance, and fault is found early, avoids unnecessary trouble and loss.
Pressure control reflux valve working principle:
Adopt pressure control reflux valve 16 among the present invention, just can better less backflow, further improve energy-saving effect, the while can also guarantee the desired fuel pressure requirement of original motor.
Basic demand is: when the motor proper functioning, require to open valve, fuel oil can be flowed out by valve, its flow can be provided with by the adjusting screw of output terminal, makes it under certain pressure, flow be the 0.5-5 liter/hour between.When motor quit work, this valve will be closed, and on he and the one-way valve 18 common guarantee fuel delivery loops, in a period of time, had certain fuel pressure, proper functioning immediately when guaranteeing next vehicle launch.
Pressure control reflux valve 16 has utilized oil pump delivery pressure (pressure before the one-way valve 18) to control.After engine operation, oil pump running, the front end of one-way valve 18 can produce the pressure greater than 1 kilogram, and this pressure can cracking pressure be controlled reflux valve 16, makes valve open; When motor quits work, oil pump delivery pressure (pressure before the one-way valve 18) can descend at once, makes pressure control reflux valve 16 valve closings.
Claims (9)
1, a kind of petrol engine intelligent controlled fuel oil supply method adopts oil pump (11), oil spout guide rail (14), pressure reflux valve (16), fuel tank (17), one-way valve (18) and confession, return line to form fuel oil supply system; It is characterized in that: in the pipeline of oil pump and oil spout guide rail, adorn pressure transducer (13), and use intelligent controller, transfer bus (15), warning circuit (27); Described intelligent controller is made up of motor (24), microprocessor (25), the input signal circuit (26) of mu balanced circuit (21), over-voltage and over-current protector (22), drive circuit (23), oil pump; When opening ignition switch, the control signal that engine electronic control unit ECU provides (19), through the input signal circuit, send in the microprocessor, through the calculating of control software, the judgement of microprocessor, to the certain voltage of Oil pump electrical machinery output, simultaneously, the pressure signal on the microprocessor detected pressures sensor, and according to this pressure signal, at any time revise the magnitude of voltage that is transported to Oil pump electrical machinery, what keep-up pressure is stable; When microprocessor detects, judges the fuel oil supply system existing problems, after the bus level conversion,, send warning message to sound light alarming circuit through transfer bus, sound light alarming circuit can in time send the acoustooptic alarm signal according to warning message.
2, a kind of petrol engine intelligent controlled fuel oil supply method according to claim 1, it is characterized in that: the described sound light alarming circuit of described sound light alarming circuit (27) connects acoustooptic alarm microprocessor (32) by electrical level conversion circuit (31), (32 connect speech signal amplifier (33) and loudspeaker 34 to the acoustooptic alarm microprocessor, the tutorial light that other port is connected to separately constitutes, after sending the code information of being out of order by intelligent controller, after the conversion through acoustooptic alarm bus level change-over circuit (31) partly, information conveyance is arrived in the signal acoustooptic alarm microprocessor (32), acoustooptic alarm microprocessor (32) is encoded according to information, light corresponding trouble light, carry out photoelectric alarm, and simultaneously with voice signal process amplifier (33), be transported in the loudspeaker warning of sounding.
3, a kind of petrol engine intelligent controlled fuel oil supply method according to claim 1, it is characterized in that: dress pressure control reflux valve (16) between oil spout guide rail (14) and the fuel tank (17) in described return line, the valve of described pressure control reflux valve are to be opened and closed by the charge oil pressure control of oil pump output.
4, a kind of petrol engine intelligent controlled fuel oil supply method according to claim 1 is characterized in that: the control software of the microprocessor of described intelligent controller, and its control procedure is:
A, at first installs system, and after logical the powering on, program is carried out the operation of initialization S0 frame; Initialization is finished, and carries out the ignition key switch status detection of S1 frame;
Do you B, judge that ignition key switch opens?, then do not carry out static pressure and change the operation that detects S7; According to the situation of variance ratio, carry out judging whether system exists the S8 of leakage to calculate; If judge and think, there is the situation of leaking, the S9 operation of then reporting to the police and preparing; After finishing S9 operation, if or judge and think that not, return information is carried out ignition key switch and whether opened judgement;
Be, then carry out the S2 operation, be written into the relevant parameter of adjusting,,, send warning message to acoustooptic alarm system then by bus if find to have leak flag simultaneously;
C, finish after the aforesaid operations, program enters main program part S3, S4, the S5 of intelligent control process;
In main program, detect fuel pressure in real time, press the operation of S3 frame and according to the pressure trend situation, in time adjust the pulse width of exporting to Oil pump electrical machinery, press the operation of S4 frame, change the rotating speed of oil pump, fuel pressure is remained in the desired pressure range;
D, judge whether oil-fired system work is normal, is, then only carry out the operation of above-mentioned S3, S4, S5;
Not, find that there are abnormal conditions in fuel oil supply system, then carry out anomaly analysis immediately; And, return simultaneously and carry out main program part S3, S4, S5 according to the failure cause transmission warning message of analyzing.
5, a kind of petrol engine fuel delivery intelligence control method according to claim 4, it is characterized in that: there are abnormal conditions in described discovery fuel oil supply system, have following several former because:
● the oil pump serious wear, near working life;
● there is serious leakage in oil-fired system;
● the fuel oil shortage;
6, a kind of intelligent controlled fuel oil supply system of gasoline engine, comprise oil pump (11), oil spout guide rail (14), fuel tank (17), one-way valve (18) and confession, return line, it is characterized in that: also comprise intelligent controller (12) and pressure transducer (13), pressure reflux valve (16); Described pressure transducer is loaded in the pipeline of one-way valve and oil spout guide rail, pressure transducer is connected with the input terminal of intelligent controller, pressure transducer is monitored the fuel pressure in the oil supply system in real time, and fuel pressure is converted to electrical signal inputs to intelligent controller; The output port of described intelligent controller is connected to the power supply terminal of the motor of oil pump by elastic cable paper, microprocessor in the intelligent controller is according to the fuel pressure of monitoring in real time in the oil supply system, control software by microprocessor carries out data processing, the rotating speed of control oil pump, make oil pump that the fuel oil of different amounts is provided, keep required, stable fuel pressure on the fuel delivery loop; Reach when detecting, judging the fuel oil supply system existing problems, send alarm signal, in time send acoustooptic alarm information by warning circuit to warning circuit.
7, intelligent controlled fuel oil supply system of gasoline engine according to claim 6 is characterized in that: it is characterized in that: intelligent controller (12) is made up of with warning circuit (27) motor (24), microprocessor (25), input signal circuit (26), the bus level change-over circuit (28) of mu balanced circuit (21), overcurrent protector (22), drive circuit (23), oil pump; The control signal that the pressure signal of described input signal circuit (26) incoming pressure sensor and engine electronic control unit ECU provide, the input signal circuit connects microprocessor, output end of microprocessor mouth connecting bus electrical level conversion circuit, and join with message transfer bus and warning circuit, the output port of microprocessor connects and the controlling and driving circuit; Drive circuit connects and the driving oil pump; Described mu balanced circuit connects simultaneously and gives input signal circuit, pressure transducer, microprocessor power supply, overcurrent protector of described drive circuit series connection, and by direct power supply power supply.
8, intelligent controlled fuel oil supply system of gasoline engine according to claim 7 is characterized in that: each of described voltage-stabilized power supply circuit (21), over-current protection circuit (22), drive circuit (23), microprocessor (25) and bus level change-over circuit (28), input signal circuit (26) consists of:
+ B is connected on the power supply of normal open electricity, insert by socket J4, + VB also is the permission oil pump work whether signal level that controller will detect for the power supply of the next supply oil pump work of engine electronic control unit ECU, and power supply inserts by socket J0;
Input signal circuit (26): form the supply voltage that is used for the supply oil pump work that the engine electronic control unit ECU with+VB input comes by photo coupler U2, resistance R 7, capacitor C 2 etc., be transformed to the adaptable level signal of microprocessor IC1, the light-emitting diodes pipe end of photo coupler U2 be connected with current-limiting resistance R7 and smoothing capacity C2; The level signal of engine electronic control unit ECU is delivered to after the conversion among the microprocessor IC1; On the pin 1 that the output line of pressure sensor part YL is connected to microprocessor (25) and the pin 3, pressure sensor part YL power supply source line is connected on the power supply VCC that mu balanced circuit (21) provides;
Voltage-stabilized power supply circuit (21): the input end of mu balanced circuit is connected on the power supply+B of normal open electricity, by being connected with integrated regulator IC2 behind the diode D1, the output terminal of integrated regulator IC2 is that a galvanic current is pressed VCC, this end connects and pressure sensor part A, input signal circuit (26), microprocessor (25), for this three partial circuit provides stabilized power source, electrochemical capacitor E2, E3, capacitor C 10 be mu balanced circuit move back the lotus root filter element, connect grounding end VSS respectively with input, output terminal and the controller of integrated regulator IC2;
Microprocessor (25): 1 pin of microprocessor IC1 meets power supply VCC, pin 2 earth levels, pin 3 is set to signal input part, and is connected to the output signal end of pressure transducer, the output signal of pressure transducer is after modulus A/D conversion, and microprocessor IC1 detects fuel pressure; Pin 6 is set to add electric signal input end, be connected on the output terminal of photo coupler U2, be used for monitoring the supply voltage that engine electronic control unit ECU supplies with oil pump work, just allow oil pump work whether signal, pin 6 connects level pull down resistor R3, and connects grounding end VSS; Pin 7 is arranged to input end, on the receiving terminal pin 2 among connection and the bus level change-over circuit TX, is used for receiving other information that transmit on the bus, level pull-up resistor R1; Pin 2 is set to into output terminal, on the transmitting terminal pin 1 among connection and the bus level change-over circuit TX, is used for sending on bus and reports to the police and fault message; Pin 5 is set to output terminal, is connected with the input end of drive circuit (23); Bus level change-over circuit (28) is output as socket J4;
Described microprocessor output frequency is constant, the pulse signal of pulse width variation;
Drive circuit 23: the two-stage amplification circuit by triode Q1, field effect transistor Q2 is formed, the input end triode Q1 base stage of amplification circuit is exported an end pin 5 through build-out resistor R13 and microprocessor IC1 and is connected, the emitter of triode Q1 links to each other with grounding end VSS, the current collection of triode Q1 is output terminal and in parallel with load resistance R8 and build-out resistor R10 very, another termination+VB of load resistance R8; Resistance R 10 connects the grid of next stage amplification circuit field effect transistor Q2, the source electrode of field effect transistor Q2 connects the motor of oil pump by gang socket J1, connect the power supply+VB of the supply oil pump work that Engine ECU comes, i.e. socket J0 by the drain electrode of field effect transistor Q2 through overcurrent protective circuit (22); Simultaneously, at the drain electrode parallel voltage-stabilizing diode D3 of field effect transistor Q2 negative pole end, reference diode D3 positive terminal connects field effect transistor Q2 drain electrode, and this reference diode D3 is the components and parts of protection field effect transistor Q2;
The positive pole of diode D2 connects the motor ground end VSS of oil pump, negative pole connects the grid output terminal of field effect transistor Q2 and the motor positive terminal of oil pump, and connect the capacitor C 6 between ground level and the field effect transistor Q2 grid output terminal, and join with the resistance R 9 that is together in series, capacitor C 7, resistance R 9, capacitor C 7 connect the grid of field effect transistor Q2, electrochemical capacitor E1 be connected and the motor ground of power supply+VB and oil pump end VSS between, electrochemical capacitor E1 is+the VB power supply move back lotus root electric capacity; Described R9, C7 series circuit improve output waveform to be used, and described diode D2 is used for subduing the inverse electromotive force that Oil pump electrical machinery produces, and has the effect that certain elimination Oil pump electrical machinery disturbs; Described socket J1 is the output terminal of intelligent controller, and the output terminal of intelligent controller drives the motor (24) of oil pump, and the voltage of different equivalent value is provided;
Over-current protection circuit (22): over-current protection circuit is connected between power supply+VB and field effect transistor Q2 drain electrode;
9, intelligent controlled fuel oil supply system of gasoline engine according to claim 6, it is characterized in that: described pressure reflux valve (16) is a kind of pressure control reflux valve, the pressure control reflux valve comprises the pressure control filler opening (167) of filler opening (162) and oil outlet (163) on valve body (161), the valve body, the valve (164) in the valve body and cooperation valve port (165), expansion capsule (166) and expansion capsule, and valve port communicates with oil outlet; Described expansion capsule is contained in the valve body, and with valve contact or is connected, under the effect of the oil pressure in the expansion capsule, the expansion tube squeezing valve is opened, after the decline of expansion capsule oil pressure, and valve closing; Described pressure control filler opening is connected with the oil pipe of oil pump output.
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| CN2008100547747A CN101255836B (en) | 2008-04-08 | 2008-04-08 | Supply method and system for intelligent control of gasoline engine fuel oil |
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