CN103016168A - Diesel engine/natural gas dual-fuel engine electric control system - Google Patents
Diesel engine/natural gas dual-fuel engine electric control system Download PDFInfo
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- CN103016168A CN103016168A CN2011102915694A CN201110291569A CN103016168A CN 103016168 A CN103016168 A CN 103016168A CN 2011102915694 A CN2011102915694 A CN 2011102915694A CN 201110291569 A CN201110291569 A CN 201110291569A CN 103016168 A CN103016168 A CN 103016168A
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- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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Abstract
The invention discloses a control method and a control device of a diesel/natural gas dual-fuel engine. The method is characterized in that that on the basis of maintaining an original engine control system, a diesel and gas control unit is added. Signals of all sensors of the original machine are shared by the dual-fuel control system and an electric control system of the original machine. The added dual-fuel control unit can control the injection of the diesel and an additionally-installed gas injection system (including a gas nozzle electromagnetic control, a gas switch valve control, gas liquid level or pressure monitoring and the like), and the added dual-fuel control unit can also process signals which are associated to the gas system. The injection volume and the oil injection moment of the diesel can be precisely controlled according to different working states of a diesel engine, and the injection time and the injection duration of the natural gas can also be controlled. The duel-fuel engine can be enabled to run safely and stably, the fuel consumption can be reduced, and the emission of tail gas can be reduced.
Description
Technical field
Designed engines control technique of the present invention, the particularly method and apparatus of the diesel/natural gas dual-fuel engine oil-gas jetting control under a kind of electronically controlled unit pump, the common rail technology.
Background technique
Along with the day of petroleum resources is becoming tight, world's fuel price rises violently again and again, the oil price of China also is one to rise and rise again, the scientific development of the clean energy resource diesel engine of the substitute fuel take rock gas as representative is used with ripe, can effectively reduce the problems such as the user cost of heavily blocking, the shortage of alleviating the energy, solution exhaust emission.In existing diesel/natural gas dual-fuel control technique, normally set up the rock gas control system on the basis of diesel engine and diesel oil control system, the value of diesel pilot amount be a very important table quantitatively,
The control of Pilot diesel flow rate roughly has three types, namely adopts in-line fuel injection pump, minitype high voltage oil pump, the electronic pump Jet control Pilot diesel flow rate of former diesel engine.China's diesel engine diesel oil supply system is controlled to be the master mainly with machinery at present, not change of the former machine of diesel engine and oil supply system during transformation, only increased by a cover CNG air feeder, so the transformation of CNG/Diesel machine duel fuel engine mainly is the design of natural gas supply system.Although can reach the purpose of restriction pilot diesel fuel quantity by the fuel injection quantity of limit mechanical pump, because oil spout is constantly non-adjustable, so that the performance of motor can not be optimized, the gas consumption rate is higher.
Therefore, use mechanical pump can not optimize oil spout constantly and pilot injection amount, affect motor Operation safety and stability, increased simultaneously consumption and the exhaust emissions of fuel.
Summary of the invention
Thereby the controlling method and the device that the present invention is directed to traditional diesel/natural gas dual-fuel engine oil gas can't accurately be controlled the problem that affects motor Operation safety and stability to amount and the time for spraying of diesel oil and rock gas, a kind of method of duel fuel engine oil-gas jetting control is provided, can accurately control according to the different operating mode of diesel engine time for spraying and the injection duration of diesel oil and rock gas, thereby guarantee the working state safety and steady of duel fuel engine, reduce fuel consumption, reduce discharge of poisonous waste.The invention still further relates to a kind of diesel/natural gas dual-fuel engine oil-gas ratin control gear.
Technological scheme of the present invention is as follows:
A kind of method of duel fuel engine oil-gas jetting control, described duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system.It is characterized in that, the method comprises: this duel fuel engine control system is on the basis that keeps former machine engine control system, increases by cover diesel oil and a combustion gas control unit.Each signal of former machine (water temperature, boost pressure and temperature, rail pressure, etc.), shared by the automatical control system of dual-fuel control system and former machine.The fuel gas injection system (comprising gas nozzle electromagnetic valve, gas switch valve control, combustion gas liquid level, pressure and temperature monitoring etc.) that the double fuel control unit that increases can be controlled diesel injection (diesel injector electromagnetic valve) and install additional, and the miscellaneous part of former machine (such as rail pressure, air system (VGT, EGR etc.)) is still controlled by former machine system.The control of the diesel injection of former machine, the relay by the outside switches, and this relay is controlled by dual-fuel control system.Can obtain two kinds and be respectively by controlling this relay: the mode of operation of pure diesel oil state and double fuel state.For guaranteeing former machine control system normal operation when the double fuel state, by special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection control.The double fuel control unit should be able to the monitoring engine parameters, whether selects control to diesel injection system and fuel gas injection system according to set policy-flexible.In the situation that be not suitable for using combustion gas (as gas nozzle open circuit, sensor failure etc.), cut off fuel gas injection, and system's control returned the reducing machine system.If this system's total failure, then the control automatic moving of the complete machine control system of giving former machine.
Each signal emitter of former diesel engine (cooling-water temperature sensor, boost pressure, temperature transducer, oily rail pressure sensor, speed probe, throttle position switch etc.) can be shared by dual-fuel control system and former Electrical Control system by dual mode.One is the separated time mode, and namely the sensor signal of former machine all is connected to former machine ECU and double fuel ECU simultaneously by parallel wire.It two reads from former machine ECU by the CAN bus for double fuel ECU.Thereby so that dual-fuel control system obtains each sensor signal of former machine.By special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection.Natural gas liquid level sensor collection residue amount of natural gas signal is set in the rock gas control system.
By each sensor signal and the power supply voltage signal of duel fuel engine electronic control unit (double fuel ECU) according to the motor that collects, judge the working state of diesel engine and carry out fault diagnosis, described working state comprise the standby, warming-up, normal temperature, high temperature of diesel engine, at the uniform velocity, acceleration, deceleration, idling and battery supply feed.
Carry out the switching of diesel/natural gas dual-fuel pattern and pure diesel fuel mode by double fuel throw over switch (pattern relay) is set in the rock gas control system, can obtain two states and be respectively: the mode of operation of pure diesel oil state and double fuel state.
Pure diesel oil state, under this mode of operation, the pattern relay is in the normally open position, the diesel injection control unit of former machine control system links to each other with true diesel fuel nozzle solenoid valve, gas switch valve is closed, gas supply cuts off, and the double fuel control unit is only in the monitoring state, does not carry out any injection control.Engine control this moment state is identical with former machine state.As shown in Figure 2.
The double fuel state, under this state, the pattern relay closes, the diesel injection control unit of former machine control system links to each other with simulation nozzle solenoid valve, and the switching time of diesel injection solenoid valve and fuel gas injection electromagnetic valve and switch duration are independently controlled by the double fuel control unit.Its state of a control as shown in Figure 3.Under this state, under working conditions of different engines, emitted dose and the discharge time of diesel oil and rock gas are determined by nominal data.
A kind of duel fuel engine oil-gas jetting control gear, described duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system.It is characterized in that, this duel fuel engine control system is on the basis that keeps former machine engine control system, increases by a cover diesel/natural gas dual-fuel control system.Main four parts of this system form: dual-fuel controller (double fuel ECU), pattern relay, simulation nozzle solenoid valve and fuel gas injection system.Each signal of former machine (water temperature, boost pressure and temperature, rail pressure, etc.), shared by the automatical control system of dual-fuel control system and former machine.The fuel gas injection system (comprising gas nozzle electromagnetic valve, gas switch valve control, combustion gas liquid level, pressure and temperature monitoring etc.) that the double fuel control unit that increases can be controlled diesel injection (diesel injector electromagnetic valve) and install additional, and the miscellaneous part of former machine (such as rail pressure, air system (VGT, EGR etc.)) is still controlled by former machine system.The control of the diesel injection of former machine, the pattern relay by the outside switches, and this relay is controlled by dual-fuel control system.Former machine control system normal operation during for assurance double fuel state by special electromagnet simulation diesel injector electromagnet characteristic, is used for taking over former machine diesel injection control.Can obtain two kinds by the control mode relay is respectively: the mode of operation of pure diesel oil state and double fuel state.Under pure diesel fuel mode, the pattern relay is in normally open, and former machine ECU links to each other with true diesel fuel nozzle solenoid valve, and diesel injection is controlled by former machine ECU; Under dual fuel mode, the pattern relay is in closed state, and former machine ECU links to each other with simulation nozzle solenoid valve.And the switching time of diesel injection solenoid valve and fuel gas injection electromagnetic valve and switch duration are independently controlled by the double fuel control unit.Described double fuel ECU is according to the motor run signal that receives and rock gas liquid level signal, judge the working state of diesel engine and carry out fault diagnosis, according to the diesel injection solenoid valve of diesel engine under each working state and switching time and the switch duration of fuel gas injection electromagnetic valve demarcated, the injection control signal of diesel oil and rock gas is transferred to respectively diesel oil control system and rock gas control system.In the situation that be not suitable for using combustion gas (as gas nozzle open circuit, sensor failure etc.), cut off fuel gas injection, and system's control returned the reducing machine system.If this system's total failure, then the control automatic moving of the complete machine control system of giving former machine.
The run signal of described motor is that double fuel ECU and former machine ECU share, and comprises the signals such as cooling water temperature, throttle position, engine speed, camshaft degree, crank angle and air-distributor pressure.Described natural gas liquid level sensor is arranged in the rock gas control system.Described electromagnet for simulation diesel injector electromagnet characteristic (simulation nozzle solenoid valve) links to each other with pattern relay normal-closed end.
Described signal acquisition module also is included in double fuel throw over switch and supply voltage sensor is set in the rock gas control system.The manual control command signal of described double fuel throw over switch output double fuel operation also transfers to double fuel ECU, described double fuel ECU is according to the motor run signal that receives, power supply voltage signal, the manual control command signal of natural gas liquid level sensor signal and double fuel operation, judge the working state of diesel engine and carry out fault diagnosis, described working state comprise the standby, warming-up, normal temperature, high temperature of diesel engine, at the uniform velocity, acceleration, deceleration, idling and battery supply feed.
Described double fuel ECU comprises interconnected signal processing unit and logic controller, also comprise diesel fuel nozzle control submodule, rock gas nozzle control submodule and relay driven element module that the andlogic control device links to each other, described signal processing unit links to each other with signal acquisition module, described diesel fuel nozzle control submodule links to each other with diesel fuel nozzle in the diesel oil control system, described rock gas nozzle control submodule links to each other with rock gas nozzle in the rock gas control system, and described relay driven element module links to each other with the pattern relay;
Described signal processing unit receives the signal of signal acquisition module output, and converts described signal to computing can be identified and participate in to logic controller signal;
Described logic controller receives the motor run signal of signal processing unit conversion, judge the working state of motor, and switching time and the switch duration of calculating diesel injection solenoid valve and fuel gas injection electromagnetic valve under the current working according to the data that receive, and the time that corresponding amount of natural gas is sprayed outputed to rock gas nozzle control submodule with injection cycle, simultaneously diesel fuel nozzle is controlled submodule and limit corresponding diesel injection amount and injection advance angle;
Described diesel fuel nozzle control submodule, the instruction of RL controller, and the work of diesel fuel nozzle driven and limit;
Described rock gas nozzle control submodule, the instruction of RL controller, and the work of rock gas nozzle driven and stop.
Described relay driven element module, the instruction of RL controller, and the work of pattern relay driven and stop.
This device also comprises fault indicating lamp, and described fault indicating lamp links to each other with double fuel ECU, and described fault indicating lamp receives the instruction of double fuel ECU, the frequency of control flicker of fault indicating lamps.
Technique effect of the present invention is as follows:
The controller of the diesel/natural gas dual-fuel engine that the present invention relates to and method, it is the duel fuel engine that installs the rock gas control system for the basis in former car diesel engine and diesel oil control system additional, adopt duel fuel engine electronic control unit (double fuel ECU) according to the engine sensor signal that collects and the working state of rock gas liquid level signal determining motor, according to the diesel injection solenoid valve of diesel engine under each working state and switching time and the switch duration of fuel gas injection electromagnetic valve demarcated, realize diesel oil control system and rock gas control system are controlled respectively.Guarantee duel fuel engine working state safety and steady, reduce fuel consumption, reduce exhaust emissions.
The duel fuel engine control gear that the present invention relates to comprises dual-fuel controller, simulation nozzle solenoid valve and pattern relay.Dual-fuel controller comprises signal gathering unit and engine electronic control unit (double fuel ECU), gather the signal of each sensor of motor by signal acquisition module, and these information that will collect promptly and accurately transfer to double fuel ECU, double fuel ECU is according to each collection signal that receives, judge the working state of diesel engine and carry out fault diagnosis, and according to the operating conditions signal of the diesel engine of Real-time Collection, according to the diesel injection solenoid valve of diesel engine under each working state and switching time and the switch duration of fuel gas injection electromagnetic valve demarcated, the control signal of diesel oil and rock gas is transferred to respectively diesel oil control system and rock gas control system, finally by the diesel oil injection nozzle oil spout of diesel oil control system, the rock gas nozzle in the rock gas control system is jet.Simulation nozzle solenoid valve simulation diesel injector electromagnet characteristic is used for taking over former machine diesel injection, guarantees former machine control system normal operation.The double fuel throw over switch adopts the contact type button, and the response user is switched the fuel request.
Description of drawings
Fig. 1 is duel fuel engine control system schematic flow sheet:
Fig. 2 is the engine control system structural representation under the pure diesel fuel mode:
Fig. 3 is the engine control system structural representation under the dual fuel mode:
Embodiment
For making purpose of the present invention, technological scheme and advantage clearer, referring to the accompanying drawing embodiment that develops simultaneously, the present invention is described in more detail.
The embodiment of the invention provides a kind of method of duel fuel engine oil-gas jetting control, and described duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system.It is characterized in that, the method comprises: this duel fuel engine control system is on the basis that keeps former machine engine control system, increases by cover diesel oil and a combustion gas control unit.Each signal of former machine (water temperature, boost pressure and temperature, rail pressure, etc.), shared by the automatical control system of dual-fuel control system and former machine.The fuel gas injection system (comprising gas nozzle electromagnetic valve, gas switch valve control, combustion gas liquid level, pressure and temperature monitoring etc.) that the double fuel control unit that increases can be controlled diesel injection (diesel injector electromagnetic valve) and install additional, and the miscellaneous part of former machine (such as rail pressure, air system (VGT, EGR etc.)) is still controlled by former machine system.The control of the diesel injection of former machine, the relay by the outside switches, and this relay is controlled by dual-fuel control system.Can obtain two kinds and be respectively by controlling this relay: the mode of operation of pure diesel oil state and double fuel state.For guaranteeing former machine control system normal operation when the double fuel state, by special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection control.The double fuel control unit should be able to the monitoring engine parameters, whether selects control to diesel injection system and fuel gas injection system according to set policy-flexible.In the situation that be not suitable for using combustion gas (as gas nozzle open circuit, sensor failure etc.), cut off fuel gas injection, and system's control returned the reducing machine system.If this system's total failure, then the control automatic moving of the complete machine control system of giving former machine.Controlling method comprises: duel fuel engine electronic control unit (double fuel ECU) is according to each sensor signal and the power supply voltage signal of the motor that collects, judge the working state of diesel engine and carry out fault diagnosis, described working state comprise the standby, warming-up, normal temperature, high temperature of diesel engine, at the uniform velocity, acceleration, deceleration, idling and battery supply feed.According to oil-gas jetting amount and the injection advance angle of diesel engine under individual working state of demarcating diesel oil and rock gas control system are controlled respectively.This controlling method idiographic flow comprises as shown in Figure 1:
Step 101: the signal that gathers the diesel engine peripheral sensor, comprise the diesel engine water temperature sensor signal, natural gas liquid level sensor signal, the throttle position switch signal, power supply voltage signal, tach signal etc., convert the signal data that collects to data that the duel fuel engine electronic control unit can identify after, carry out next step.
Step 102: after the data that collect are carried out algorithm process, carry out technical Analysis for the ardware feature of various sensors and process, make clearly and judging, judge the working state of diesel engine and carry out fault diagnosis.
The water temperature sensor signal of diesel engine is judged: water temperature＜60 ℃, judge that diesel engine is in warm-up mode, and this moment, the duel fuel engine controller was not worked, by former diesel engine controller control diesel injection.When water temperature sensor signal＞90 ℃, judge that diesel engine is in the condition of high temperature, should suitably reduce the adding of gaseous fuel, or withdraw from the double fuel work cycle, be operated in the High Temperature state to prevent diesel engine, damage motor.When holding state, during the paranormal engine operation water temperature range of diesel engine water temperature (40-100 ℃), judge that namely cooling-water temperature sensor lost efficacy, and entered fault mode.
Natural gas liquid level sensor signal: the memory space of determining the combustion gas of gas cylinder.When the liquid level sensor signal is lower than 0, and judge that liquid level sensor lost efficacy, and entered fault mode.
Supply voltage sensor signal: judge whether feed of car load battery, be the charging of car load battery, prevent that battery supply feed from causing next vehicle launch difficulty, the electricity consumption device is operated in the low voltage abnormal condition during vehicle operating, also provides the control and compensation parameter for control electricity consumption performer.
Whether motor fault, is, then failure code is sent to step 105, directly enters the pure diesel fuel mode of step 106 simultaneously; Otherwise then enter next step.
Step 103: detect the current rotating speed of diesel engine, judge the running state of diesel engine, the state of the diesel engine actual running speeds such as that the tach signal reflection diesel engine of diesel engine is in is static, idling.When being lower than 1000r/min, engine speed automatically enters pure diesel fuel mode.
Step 104: detect the double fuel switch and whether open, if then do not enter pure diesel fuel mode.
Start the double fuel control mode and must satisfy simultaneously 1. diesel engine normal operations, 2. the double fuel throw over switch is opened, and 3. engine speed is higher than 1000r/min.The automatic operating procedure 106 pure diesel fuel modes if one of them does not satisfy; If satisfied then carry out control fuel oil and natural gas injection amount and injection advance angle, execution in step 107.
Step 107: according to the working state of duel fuel engine, spray into diesel oil amount and the amount of natural gas of motor according to Map figure control, when adding rock gas, require transition steady, guarantee the travelling comfort that former car is driven.
The embodiment of the invention also provides a kind of electronically controlled unit pump, electrically-controlled pump nozzle and the device that is total to the diesel/natural gas dual-fuel engine oil-gas jetting control under the rail technology, and this duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system.The duel fuel engine controller is realized the diesel oil of diesel engine under different operating modes and the accurate control of amount of natural gas by the control to diesel engine, diesel oil control system and rock gas control system, guarantees duel fuel engine working state safety and steady.The structural representation of control gear of the present invention as shown in Figure 3, comprise interconnective signal acquisition module 210 and duel fuel engine electronic control unit (double fuel ECU) 240, double fuel ECU links to each other with the rock gas control system respectively at the diesel oil control system.Particularly: signal acquisition module 210 gathers by separated time mode and former diesel engine controller shares cooling water temperature, lubricating oil temperature, the oil rail pressure, camshaft degree, crank angle, air-distributor pressure, the signals such as atmospheric pressure, the monitoring power voltage signal also comprises the double fuel throw over switch simultaneously.Double fuel ECU240 comprises interconnected signal processing unit 242 and logic controller 241, comprises that also the diesel fuel nozzle that the andlogic control device links to each other sprays control unit 243 and rock gas nozzle injection control unit 244.Signal processing unit links to each other with each sensor in the signal acquisition module, diesel fuel nozzle sprays control unit 243 and links to each other with diesel fuel nozzle 250 in the diesel oil control system, the rock gas nozzle sprays control unit 244 and links to each other with rock gas nozzle 251 in the rock gas control system, this control gear also comprises fault indicating lamp 252, and this tutorial light links to each other with logic controller 241 among the double fuel ECU.
Signal acquisition module 210, gather signal that each sensor detects and promptly and accurately send to double fuel ECU240, double fuel ECU is according to the power supply voltage signal that receives, the engine coolant temperature signal, tach signal, the manual control command signal of the engine operation condition signal such as throttle position signal and double fuel operation, after signal processing unit 242 processing, become logic controller 241 and can identify and participate in the data of computing, logic controller passes through software algorithm, judge the working state of diesel engine, calculate corresponding diesel oil amount and amount of natural gas, output to respectively diesel fuel nozzle and spray control unit 243 and rock gas nozzle injection control unit 244, logic controller can judge whether motor exists fault, be, then record trouble signal, and drive signal to fault indicating lamp 252 according to pulsewidth number and the dutycycle output fault of standard.
Double fuel throw over switch 223 is arranged in the rock gas control system, and the voltage signal of output (0-12V) is as the manual control command signal of double fuel operation;
Natural gas liquid level sensor 221 is the newly-increased device of apparatus of the present invention, is arranged in the rock gas control system residual capacity of real-time inspection rock gas.
Supply voltage sensor 222 is the newly-increased device of apparatus of the present invention, is arranged in the rock gas control system, and Real-time Collection car load power supply voltage signal sends to signal processing unit 242.
Described Date Conversion Unit 242, all analogue signals or the digital signal of reception signal acquisition module 210 convert the discernible signal that logic controller 241 can participate in computing to;
Described diesel fuel nozzle control unit 243, the instruction of RL controller 241 drives and limits the work of diesel fuel nozzle 250.
Described rock gas nozzle control unit 244, the instruction of RL controller 241 drives and stops the work of rock gas nozzle 251.
Described fault indicating lamp 252, the instruction of RL controller, the frequency of control flicker of fault indicating lamps clearly reflects the fault point of diesel engine.
Need to prove, this embodiment of control gear of the present invention can be applied to electronically controlled unit pump, and the motor of electrically-controlled pump nozzle and high-pressure common rail structure, the Natural Gas Type that can add comprise CNG (compressed natural gas) and LNG (LNG Liquefied natural gas).
By as seen above-mentioned, diesel/natural gas dual-fuel engine control gear under electronically controlled unit pump in the embodiment of the invention, pump nozzle, the common rail technology, basis in former diesel engine and diesel oil control system installs the rock gas control system additional, accurately control the diesel oil of diesel engine under the different operating state and emitted dose and the discharge time of rock gas, thereby guarantee duel fuel engine working state safety and stability, reduce fuel consumption, reduce exhaust emissions.
Easily understand, the above is preferred embodiment of the present invention only, is not be used to limiting spirit of the present invention and protection domain, and the equivalent variations that any those of ordinary skill in the art have done or replacement all should be considered as being encompassed within protection scope of the present invention.
Claims (11)
1. the method for duel fuel engine oil-gas jetting control, described duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system, it is characterized in that, the method comprises: this duel fuel engine control system is on the basis that keeps former machine electrical control system for engine, increase by a cover diesel oil/combustion gas double fuel control unit, each signal (water temperature of former machine, boost pressure and temperature, rail pressure, etc.), shared by the automatical control system of dual-fuel control system and former machine, the double fuel control unit that increases can be controlled diesel injection (diesel injector electromagnetic valve) and the fuel gas injection system that installs additional (comprises the gas nozzle electromagnetic valve, gas switch valve control, the combustion gas liquid level, pressure and temperature monitoring etc.), and the miscellaneous part of former machine is (such as rail pressure, air system (VGT, EGR etc.)) still by the control of former machine system, the control of the diesel injection of former machine, relay by the outside switches, this relay is controlled by dual-fuel control system, can obtain two kinds and be respectively by controlling this relay: the mode of operation of pure diesel oil state and double fuel state, for guaranteeing former machine control system normal operation when the double fuel state, by special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection control, the double fuel control unit should be able to the monitoring engine parameters, whether select control to diesel injection system and fuel gas injection system according to set policy-flexible, (open circuit such as gas nozzle in the situation that be not suitable for using combustion gas, sensor failure etc.), cut off fuel gas injection, and system's control returned the reducing machine system, if this system's total failure, then the control automatic moving of the complete machine control system of giving former machine.
2. according to right 1 described method, it is characterized in that, each signal emitter (cooling-water temperature sensor of former diesel engine, boost pressure, temperature transducer, oil rail pressure sensor, speed probe, throttle position switch etc.), can be shared by dual-fuel control system and former Electrical Control system by dual mode, one is the separated time mode, the sensor signal that is former machine all is connected to former machine ECU and double fuel ECU simultaneously by parallel wire, it two reads from former machine ECU by the CAN bus for double fuel ECU, thereby, dual-fuel control system can obtain each sensor signal of former machine, by special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection, natural gas liquid level sensor collection residue amount of natural gas signal is set in the rock gas control system.
3. according to right 2 described methods, by each sensor signal and the power supply voltage signal of duel fuel engine electronic control unit (double fuel ECU) according to the motor that collects, judge the working state of diesel engine and carry out fault diagnosis, described working state comprise the standby, warming-up, normal temperature, high temperature of diesel engine, at the uniform velocity, acceleration, deceleration, idling and battery power shortage, etc.
4. according to right 1 described method, it is characterized in that, carry out the switching of diesel/natural gas dual-fuel pattern and pure diesel fuel mode by double fuel throw over switch (pattern relay) is set in the rock gas control system, can obtain two states and be respectively: the mode of operation of pure diesel oil state and double fuel state.
5. according to right 1 or 4 described methods, it is characterized in that, under pure diesel oil state mode of operation, the pattern relay is in the normally open position, and the diesel injection control unit of former machine control system links to each other with true diesel fuel nozzle solenoid valve, gas switch valve is closed, gas supply cuts off, and the double fuel control unit is only in the monitoring state, does not carry out any injection control, engine control this moment state is identical with former machine state, as shown in Figure 2.
6. according to right 1 or 4 described methods, it is characterized in that, under the double fuel state, the pattern relay closes, the diesel injection control unit of former machine control system links to each other with simulation nozzle solenoid valve, and the switching time of diesel injection solenoid valve and fuel gas injection electromagnetic valve and switch duration are independently controlled by the double fuel control unit, its state of a control as shown in Figure 3, under this state, under working conditions of different engines, emitted dose and the discharge time of diesel oil and rock gas are determined by nominal data.
7. duel fuel engine oil-gas jetting control gear, described duel fuel engine comprises diesel engine, diesel oil control system and rock gas control system, it is characterized in that, this duel fuel engine control system is on the basis that keeps former machine engine control system, increase by a cover diesel/natural gas dual-fuel control system, main four parts of this system form: dual-fuel controller (double fuel ECU), the pattern relay, simulation nozzle solenoid valve and fuel gas injection system, each signal (water temperature of former machine, boost pressure and temperature, rail pressure, etc.), shared by the automatical control system of dual-fuel control system and former machine, the double fuel control unit that increases can be controlled diesel injection (diesel injector electromagnetic valve) and the fuel gas injection system that installs additional (comprises the gas nozzle electromagnetic valve, gas switch valve control, the combustion gas liquid level, pressure and temperature monitoring etc.), and the miscellaneous part of former machine is (such as rail pressure, air system (VGT, EGR etc.)) still by the control of former machine system, the control of the diesel injection of former machine, pattern relay by the outside switches, this relay is controlled by dual-fuel control system, former machine control system normal operation during for assurance double fuel state, by special electromagnet simulation diesel injector electromagnet characteristic, be used for taking over former machine diesel injection control, can obtain two kinds by the control mode relay is respectively: the mode of operation of pure diesel oil state and double fuel state, under pure diesel fuel mode, the pattern relay is in normally open, former machine ECU links to each other with true diesel fuel nozzle solenoid valve, and diesel injection is controlled by former machine ECU; Under dual fuel mode, the pattern relay is in closed state, former machine ECU links to each other with simulation nozzle solenoid valve, and the switching time of diesel injection solenoid valve and fuel gas injection electromagnetic valve and switch duration are independently controlled by the double fuel control unit, described double fuel ECU is according to the motor run signal that receives and rock gas liquid level signal, judge the working state of diesel engine and carry out fault diagnosis, according to the diesel injection solenoid valve of diesel engine under each working state and switching time and the switch duration of fuel gas injection electromagnetic valve demarcated, the injection control signal of diesel oil and rock gas is transferred to respectively diesel oil control system and rock gas control system, (open circuit such as gas nozzle in the situation that be not suitable for using combustion gas, sensor failure etc.), cut off fuel gas injection, and system's control returned the reducing machine system, if this system's total failure, then the control automatic moving of the complete machine control system of giving former machine.
8. device according to claim 7, it is characterized in that, the run signal of described motor is that double fuel ECU and former machine ECU share, comprise the signals such as cooling water temperature, throttle position, engine speed, camshaft degree, crank angle and air-distributor pressure, described natural gas liquid level sensor is arranged in the rock gas control system, and described electromagnet for simulation diesel injector electromagnet characteristic (simulation nozzle solenoid valve) links to each other with pattern relay normal-closed end.
9. device according to claim 8, it is characterized in that, described signal acquisition module also is included in double fuel throw over switch and supply voltage sensor is set in the rock gas control system, the manual control command signal of described double fuel throw over switch output double fuel operation also transfers to double fuel ECU, described double fuel ECU is according to the motor run signal that receives, power supply voltage signal, the manual control command signal of natural gas liquid level sensor signal and double fuel operation, judge the working state of diesel engine and carry out fault diagnosis, described working state comprises the standby of diesel engine, warming-up, normal temperature, high temperature, at the uniform velocity, accelerate, slow down, idling and battery supply feed.
10. according to claim 8 or 9 described devices, it is characterized in that, described double fuel ECU comprises interconnected signal processing unit and logic controller, also comprise the diesel fuel nozzle control submodule that the andlogic control device links to each other, rock gas nozzle control submodule and relay driven element module, described signal processing unit links to each other with signal acquisition module, described diesel fuel nozzle control submodule links to each other with diesel fuel nozzle in the diesel oil control system, described rock gas nozzle control submodule links to each other with rock gas nozzle in the rock gas control system, and described relay driven element module links to each other with the pattern relay;
Described signal processing unit receives the signal of signal acquisition module output, and converts described signal to computing can be identified and participate in to logic controller signal;
Described logic controller receives the motor run signal of signal processing unit conversion, judge the working state of motor, and switching time and the switch duration of calculating diesel injection solenoid valve and fuel gas injection electromagnetic valve under the current working according to the data that receive, and the time that corresponding amount of natural gas is sprayed outputed to rock gas nozzle control submodule with injection cycle, simultaneously diesel fuel nozzle is controlled submodule and limit corresponding diesel injection amount and injection advance angle;
Described diesel fuel nozzle control submodule, the instruction of RL controller, and the work of diesel fuel nozzle driven and limit;
Described rock gas nozzle control submodule, the instruction of RL controller, and the work of rock gas nozzle driven and stop;
Described relay driven element module, the instruction of RL controller, and the work of pattern relay driven and stop.
11. device according to claim 10 is characterized in that, this device also comprises fault indicating lamp, and described fault indicating lamp links to each other with double fuel ECU, and described fault indicating lamp receives the instruction of double fuel ECU, the frequency of control flicker of fault indicating lamps.
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| CN2011102915694A CN103016168A (en) | 2011-09-22 | 2011-09-22 | Diesel engine/natural gas dual-fuel engine electric control system |
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| CN2011102915694A CN103016168A (en) | 2011-09-22 | 2011-09-22 | Diesel engine/natural gas dual-fuel engine electric control system |
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| CN107420209A (en) * | 2017-06-26 | 2017-12-01 | 雄创（上海）新能源科技有限公司 | For the self-clearing electronic-controlled installation of Vehicular exhaust |
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| CN114542331A (en) * | 2022-01-28 | 2022-05-27 | 无锡威孚高科技集团股份有限公司 | High-pressure natural gas supply device, dual-fuel injection system and vehicle control system |
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Application publication date: 20130403 |