CN1465851A - Port sequential injection, lean burn, fully electronically controlled diesel/natural gas dual fuel engine - Google Patents
Port sequential injection, lean burn, fully electronically controlled diesel/natural gas dual fuel engine Download PDFInfo
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- CN1465851A CN1465851A CNA021208565A CN02120856A CN1465851A CN 1465851 A CN1465851 A CN 1465851A CN A021208565 A CNA021208565 A CN A021208565A CN 02120856 A CN02120856 A CN 02120856A CN 1465851 A CN1465851 A CN 1465851A
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Abstract
一种气口顺序喷射、稀燃、全电控柴油/天然气双燃料发动机，其在发动机每个气缸的进气口处安装天然气气口顺序喷射装置、在喷油泵上安装比例电磁铁、并增设电子控制系统；天然气气口顺序喷射装置由安装在每个气缸进气口处的喷射电磁阀和用于安装电磁阀的电磁阀座组成。天然气气路由高压气瓶、天然气滤清器、天然气减压阀组成。电子控制系统由电子控制单元和与发动机连接的若干个传感器组成。本发明的优点是：1、改装工程简单。2、发动机排放达到欧洲III标准。3、天然气替代率高。4、具有良好的加速、减速特性，驾驶性能好。5、可实现天然气定时、定量控制；柴油量的精确控制。6、电控单元具有强干扰能力，可靠性好。
A port sequential injection, lean burn, fully electronically controlled diesel/natural gas dual fuel engine, which installs a natural gas port sequential injection device at the intake port of each cylinder of the engine, installs a proportional electromagnet on the fuel injection pump, and adds an electronic control System; natural gas port sequential injection device consists of an injection solenoid valve installed at the intake port of each cylinder and a solenoid valve seat for installing the solenoid valve. The natural gas route consists of a high-pressure gas cylinder, a natural gas filter, and a natural gas pressure reducing valve. The electronic control system consists of an electronic control unit and several sensors connected to the engine. The advantages of the present invention are: 1. The refitting project is simple. 2. Engine emission meets Euro III standard. 3. High substitution rate of natural gas. 4. It has good acceleration and deceleration characteristics and good driving performance. 5. It can realize timing and quantitative control of natural gas and precise control of diesel quantity. 6. The electronic control unit has strong interference ability and good reliability.
Description
Affiliated field:
The present invention relates to a kind of motor car engine, particularly a kind of port-sequence-injection, lean-burn, full electronic controlled diesel/natural gas dual-fuel engine.
Background technique:
The diesel/natural gas dual-fuel engine of domestic production at present generally adds the mechanical fuel limit device of a cover to the control of diesel oil amount on the diesel oil supply system basis of former machine, can not accurately control oil mass, and exhaust index is poor.At the rock gas supply respect, be to adopt mechanical mixer or single-point electric controller mostly, mechanical mixer is according to Venturi or orifice plate flow agent principle, promote the control that the rock gas control valve is finished the rock gas delivery volume by mechanical spring according to the air inlet amount, this device is difficult to accurately control amount of natural gas and excess air coefficient when environmental factor changes.Though automatically controlled by contrast single-point discharge mixer can accurately be controlled amount of natural gas, but there is following defective in it equally with mechanical mixer: 1, because the proportion difference of rock gas and air is very big, cause air inlet layering in the intake manifold, the air fuel ratio difference of mixed gas is big between each cylinder, easily pinking and maximum discharge.2, for pressure-increasing machine and two-stroke machine, because valve overlap is big, cause the scavenging short circuit, the HC discharging is increased.3, for natural gas fuel when the low-load, must corresponding minimizing air inflow, need on intake duct, install closure for this reason, but being installed, closure will make the thermal efficiency of sub load reduce about 20%.
Summary of the invention:
Purpose of the present invention just is to overcome above-mentioned the deficiencies in the prior art, and a kind of port-sequence-injection, lean-burn, the full electronic controlled diesel/natural gas dual-fuel engine that can accurately control diesel oil amount, natural gas injection amount, natural gas injection timing and excess air coefficient is provided.
Technological scheme of the present invention is: a kind of port-sequence-injection, lean-burn, full electronic controlled diesel/natural gas dual-fuel engine comprise former diesel engine, natural gas supply system, diesel oil supply system and electronic control unit (ECU), it is characterized in that: at the suction port place of each cylinder of motor rock gas port-sequence-injection device is installed, proportion of installation electromagnet and set up electronic control system on Injection Pump; The solenoid valve seat that described rock gas port-sequence-injection device is installed solenoid valve by the injection electromagnetic valve that is installed in each cylinder air inlet place and being used to is formed, on solenoid valve seat, increase the natural gas distribution pipe, guide gas spraying to intake valve by the natural gas distribution pipe; Described rock gas gas circuit is made up of gas cylinder, rock gas filter cleaner, rock gas reduction valve; Gas cylinder is connected with the rock gas filter cleaner, and the rock gas filter cleaner is connected with the rock gas reduction valve, and the rock gas reduction valve is connected on the rock gas common rail pipe by flexible pipe, and joins with rock gas port-sequence-injection device; Described electronic control system is made up of with the plurality of sensors that is connected with motor electronic control unit; The output terminal of sensor is connected with the input end of electronic control system, and the output terminal of electronic control system is connected with above-mentioned injection electromagnetic valve, proportion electro-magnet.
Above-mentioned electronic control unit (ECU) is selected the MC6833232 of Motorola bit microprocessor for use, comprises micro controller module, digital collection module, power drive and protection module, power module, communication module and demonstration and alarm module; Wherein micro controller module is made up of crystal oscillator, storage and the chip that resets, and they all are connected with the MC6833232 bit microprocessor; The digital collection module is made up of collection of simulant signal circuit, switching value signal acquisition circuit and pulse signal acquisition circuit, the collection of simulant signal circuit comprises eliminator, A/D analog-digital converter, the input end of eliminator is connected with sensor, output terminal is connected with the input end of A/D analog-digital converter, and the output terminal of A/D analog-digital converter is connected with the interface of MC6833232 bit microprocessor; The output terminal of the input termination enable switch of the low-pass filter in the switching value signal acquisition circuit, output terminal is connected with the input end of scmitt trigger circuit, the output terminal of scmitt trigger circuit is connected with the interface of MC6833232 bit microprocessor, the input end of the eliminator in the pulse signal acquisition circuit is connected with the output terminal of sensor, the output terminal of eliminator is connected with the input end of scmitt trigger circuit, the output terminal of scmitt trigger circuit is connected with the input end of monostable circuit, and the output terminal of monostable circuit is connected with the interface of MC6833232 bit microprocessor; Power drive and protection module are made up of power drive pipe TMOS and power grid drive chip IR2127, and the input end of power grid drive chip IR2127 is connected with the output terminal of solenoid valve and proportion electro-magnet respectively, and output terminal is connected with the power drive pipe; It is the voltage-dropping type PWM switch power that master chip constitutes that power module adopts with MAX727; Communication module adopts the MAX202 chip, and the input end of this chip is connected with the SCI interface of MC6833232 bit microprocessor, and output terminal is connected with PC; Demonstration and alarm module are made up of a triode that is connected with the MC6833232 bit microprocessor and connected tutorial light; Electronic throttle sensor in the sensor, be installed in natural gas temperature sensor, natural pressure force transducer on the rock gas common rail pipe, be installed in intake air temperature sensor and air inlet pressure sensor on the suction tude, be installed in cooling water temperature sensor, oil temperature sensor and oil pressure sensor in the engine body, be installed in the tooth bar feedback transducer on the proportion electro-magnet; The output terminal of these sensors all is connected with the input end of collection of simulant signal circuit in the electronic control system; The input end that is installed in the synchronous signal sensor on the engine cam and is installed in the pulse signal acquisition circuit in output terminal and the electronic control system of footmark sensor of engine flywheel dish top is connected.
The bottle mouth position of the rock gas gas cylinder in the above-mentioned rock gas gas circuit is equipped with rock gas hand off valve, at the pipeline place that is connected with the rock gas filter cleaner rock gas swift electron cut-off valve is housed.
The input end reverse parallel connection transient voltage of above-mentioned power module suppresses diode TVP.
Advantage of the present invention is: 1, refitting engineer is simple.Remove natural gas supply system, proportion electro-magnet and the electronic control system (ECU) of addition, former motor is not made any change, the driver only need control gas pedal, just can realize perfect operation to motor by ECU.2, natural gas supply system mainly comprises a rock gas gas path device and a cover rock gas port-sequence-injection device, the port-sequence gas ejecting system can accurately be controlled the emitted dose of rock gas and the air fuel ratio (λ) of injection timing and combustion process in real time, apace, and can adopt " cylinder stopping technique " to make engine operation in excess air coefficient scope preferably when sub load.3, on former diesel engine basis, increased a linear proportion electro-magnet, carried out the accurate control of diesel oil oil mass in real time by proportion electro-magnet pulling oil pump handle.Owing to kept the diesel pump and the oil sprayer of former machine, can occur when oil mass is too small that fuel-oil atmozation is bad, the unsettled situation of fuel-flow control, therefore define minimum diesel pilot amount---10% of full oil mass.4, the engine emission index is good, can satisfy Europe mouthful exhaust index, good economy performance, and minimum fuel economy is better than former diesel engine (quality of natural gas is converted to the diesel oil amount by calorific value).5, adopt the ECU (Electrical Control Unit) (ECU) of the MC6833232 of Motorola bit microprocessor exploitation can realize that operating mode judgement (startup, idling, acceleration, deceleration, hypervelocity operating mode), mode of operation selection (pure diesel oil, double fuel work), MAP revise functions such as (natural gas injection amount, diesel injection amount, cylinder deactivation number), fault diagnosis, online communication, speed limit, smokeless startup.
Description of drawings:
Fig. 1 is a structural representation of the present invention
Fig. 2 is a rock gas port-sequence-injection device
Fig. 3 is the electronic control system schematic representation
Fig. 4 is the logic diagram of electronic control system
Fig. 5 is the microprocessor module block diagram
Fig. 6 is the block diagram of collection of simulant signal circuit
Fig. 7 is a switching value signal acquisition circuit block diagram
Fig. 8 is a pulsed quantity signal acquisition circuit block diagram
Fig. 9 is power module circuitry figure
Figure 10 is a workflow block diagram of the present invention
Figure 11 is the start-up sequence block diagram
Figure 12 is a double fuel workflow sketch
Figure 13 is the wheel cylinder algorithm flow chart
Figure 14 is an oil mass calibration adjustment schematic representation
Figure 15 demarcates flow chart for oil mass
Figure 16 is cylinder deactivation number, natural gas injection amount, diesel injection amount correction logic block diagram
Figure 17 is that cylinder is counted the correction flow chart
Figure 18 changes the fluctuation of speed figure that causes for the cylinder number
Fluctuation of speed figure when Figure 19 is 1400 rev/mins of oil gas switchings.
Fluctuation of speed figure when Figure 20 is 2200 rev/mins of oil gas switchings.
Embodiment:
As shown in Figure 1, 2: a kind of full electronic controlled diesel/natural gas dual-fuel engine, comprise engine body 15, cylinder, Injection Pump 20 and oil sprayer 16, it is characterized in that: rock gas port-sequence-injection device is installed at the suction port place of each cylinder of motor, proportion of installation electromagnet 22 on Injection Pump is set up electronic control system 2; Described rock gas port-sequence-injection device by the injection electromagnetic valve 14 that is installed in each cylinder air inlet place and the solenoid valve seat 13 that is used to install solenoid valve form, solenoid valve seat 13 is connected with rock gas intake valve 30 by natural gas distribution pipe 29; Described rock gas gas circuit is made up of gas cylinder 27, rock gas filter cleaner 25, rock gas reduction valve 24; Gas cylinder, rock gas filter cleaner connect and are connected successively by rock gas Steel Tube Special 4 with the rock gas reduction valve, and the rock gas reduction valve links to each other with rock gas common rail pipe 5 by flexible pipe, and joins with rock gas port-sequence-injection device; The bottle mouth position of the rock gas gas cylinder in the above-mentioned rock gas gas circuit is equipped with rock gas hand off valve 28, at the pipeline place that is connected with the rock gas filter cleaner rock gas electronics repid cut-off valve 26 is housed.Electronic control system among the present invention can realize that operating mode judgement (startup, idling, acceleration, deceleration, hypervelocity operating mode), mode of operation selection (pure diesel oil, double fuel work), MAP revise (natural gas injection amount, diesel injection amount) and fault diagnosis.When motor moved, electronic control unit at first will carry out the judgement of operating mode according to coolant water temperature, oil temperature, pressure, engine speed, accelerator pedal position, selected mode of operation according to the operating mode at place again, controlled the operation of MAP.
In order to guarantee that motor works under the optimum excess air coefficient of MAP storage, electronic control unit can be revised emitted dose, cylinder deactivation number, the diesel injection amount of rock gas in real time according to the actual conditions (intake temperature, pressure, natural gas temperature, pressure) of motor operation.During the motor operation, fault diagnosis module is monitored the working condition of each system in real time, and when some fortuitous events took place, alarm system can give the alarm and change motor over to pure diesel oil mode of operation.Communication system can be advantageously used in the maintenance and the inspection of motor.Shown in Fig. 3,4: as described in electronic control system form by electronic control unit, the plurality of sensors that is connected with motor; The output terminal of sensor is connected with the input end of electronic control unit, and the output terminal of electronic control unit is connected with proportion electro-magnet with above-mentioned injection electromagnetic valve.Above-mentioned electronic control unit is selected the MC6833232 of Motorola bit microprocessor for use, and function module wherein comprises micro controller module, digital collection module, power drive and protection module, power module, communication module and demonstration and alarm module;
As shown in Figure 5: micro controller module is made up of crystal oscillator, memory RAM, ROM and the chip Max707 that resets, and they all are connected with the MC6833232 bit microprocessor;
As shown in Figure 6: the digital collection module is by the collection of simulant signal circuit, switching value signal acquisition circuit and pulse signal acquisition circuit are formed, the collection of simulant signal circuit comprises RC eliminator and the TLC1543 analog-digital converter of being made up of electric capacity and resistance, the temperature of the input end of eliminator and rock gas and air and pressure, water temperature, oil temperature, battery tension, the position feedback information of pump rack, sensors such as accelerator pedal signal connect, output terminal is connected with the input end of TLC1543 analog-digital converter, and the TLC1543 analog-digital converter utilizes four signaling line Address, Data-Out, Clock, the MOSI of the SPI interface of CS and MC6833232 microprocessor, MISO, SCK, PCSI connects; Wherein temperature signal and battery tension will be through input filter circuits after the pretreatment.
As shown in Figure 7: the output terminal of the input termination enable switch of the low-pass filter in the switching value signal acquisition circuit, output terminal is connected with the input end of scmitt trigger circuit, and the output terminal of scmitt trigger circuit is connected with the I/O interface of MC6833232 microprocessor.
As shown in Figure 8: the input end of the eliminator in the pulse signal acquisition circuit is connected with the output terminal of sensor, the output terminal of eliminator is connected with the input end of scmitt trigger circuit, the output terminal of scmitt trigger circuit is connected with the input end of monostable circuit, and the output terminal of monostable circuit is connected with the TPU module of MC6833232 microprocessor; Monostable circuit is made up of the multi resonant vibrator and the timing element that can trigger again.Power drive and protection module are made up of power drive pipe TMOS and power grid drive chip IR2127, and the input end of power grid drive chip IR2127 is connected with the output terminal of solenoid valve and proportion electro-magnet respectively, and output terminal is connected with the power drive pipe; As shown in Figure 9: it is the voltage-dropping type PWM switch power that master chip constitutes that power module adopts with MAX727; Communication module adopts the MAX202 chip, and the input end of this chip is connected with the SCI interface of MC6833232 microprocessor, and output terminal is connected with PC; The input end reverse parallel connection transient voltage of power module suppresses diode TVP.Demonstration and alarm module are made up of a triode that is connected with the MC6833232 microprocessor and connected tutorial light; Electronic throttle sensor 1 in the sensor, be installed in natural gas temperature sensor 6, natural pressure force transducer 7 on the rock gas common rail pipe, be installed in intake air temperature sensor 9 and air inlet pressure sensor 10 on the air intake duct 12, be installed in cooling water temperature sensor 17, oil temperature sensor 18 and oil pressure sensor 19 in the engine body, be installed in the tooth bar feedback transducer 21 on the proportion electro-magnet; The output terminal of these sensors all is connected with the input end of collection of simulant signal circuit in the electronic control system; The input end of the pulse signal acquisition circuit in the output terminal of synchronous signal sensor 23 and footmark sensor 8 and the electronic control system is connected.Wherein: footmark and synchronous signal sensor: the Huo Ershi sensor provides footmark and synchronous control signal.Temperature transducer: intake temperature and natural gas temperature sensor are AD590, and it is a kind of current type two disconnected devices, and the basic principle of utilizing voltage between the transistorized be utmost point and kelvin temperature to be directly proportional designs.Pressure transducer: suction pressure and natural pressure force transducer are semiconductor piezoresistance formula sensor, and it is made of pressure conversion element and amplification circuit etc.
Accelerator pedal position and accelerator rod position transducer: be used for perception position that the driver steps on the gas and tooth bar executing location, all adopt RP series rotational position sensor, it utilizes symmetrical magnetic circuits to produce the linear magnetic field relevant with rotor angle, utilizes the highi degree of accuracy integrated chip to change into linear voltage again.
Injection electromagnetic valve: a kind of two logical normally close valves, it is opened and keep certain hour by driving pulse, thereby control the natural gas injection amount, this Timing Processing unit (TPU) by single-chip microcomputer is realized.Its driving voltage is 24V, Peak current 15A.
Proportion electro-magnet: electromagnet is to utilize electromagnetic force to realize electric energy is converted to the element of mechanical energy.After feeding electric current in the field coil of electromagnet, present different magnetic on electromagnet core and the armature end face, inhale mutually each other, armature is inhaled to iron core, thereby driven the tooth bar motion, the electric current that feeds in its position and the field coil is directly proportional.Carry out the tooth bar position regulation by the PID closed loop control algorithm.
Figure 10 is a workflow diagram of the present invention.Comprise function modules such as power-on self-test, system initialization, scale conversion, fault diagnosis, operating mode are judged, regularly calculating, MAP computing, controlled quentity controlled variable correction, communication management.
System initialization: the relevant register of modules such as SIM, the TPU of configuration MC68332, QSM, carry out the systemic-function setting.
Scale conversion: it is average that A/D result is carried out software, and according to the transducer calibration curve digital quantity is converted to corresponding physical values.
Fault diagnosis: according to sensing data and other relevant operation result, malfunction such as judge the fault of sensor and final controlling element and catch fire, deposit diagnostic trouble code in EEPROM on the one hand, provide the diagnostic trouble code parameter to TPU on the other hand, be used for the driving malfunction tutorial light.
Operating mode is judged: according to driver operation information, gas pedal and engine speed, judge that the fuel of motor uses pattern and engine operation condition.Operating conditions comprises startup, idling, operation, acceleration, deceleration and speed limit etc.
The MAP computing: according to operating conditions and fuel mode, search corresponding fuel injection quantity, the isoparametric MAP of jet amount, the line linearity interpolation of going forward side by side is calculated parameters such as jet amount and fuel injection quantity.MAP is a two-dimentional numerical table, and abscissa is a rotating speed, and y coordinate is load.MAP is according to a large amount of coupling experiments, adopts and carries out the result that full operating mode complex optimum obtains based on the Lagrange-SUMT optimized Algorithm.
Controlled quentity controlled variable correction: according to the snifting valve calibration curve, calculate jet pulsewidth, and revise with air temperature, pressure, gas pressure and temperature.According to the oil pump characteristic curve, calculate rack displacement, as the setting value of tooth bar closed loop control.
Regularly calculate: we are arranged on atdc 110 degree with the jet concluding time, according to jet pulsewidth and the jet initial point parameter of engine speed inverse, guarantee that jet a certain angle before IC Intake Valve Closes finishes, avoid occurring because high HC discharging and the high fuel consumption rate that the scavenging short circuit causes.
Communication management: explain control command and data that peripheral hardware is sent, provide data to be sent to sending buffer area.
The present invention utilizes software that the various situations of motor are controlled:
The control strategy that Figure 11 takes the startup of motor for the present invention: rock gas was difficult to abundant burning when the present invention considered starting, started in the diesel oil mode, and determined the oil spout moment and fuel delivery according to rotating speed, reduced the purpose of smoldering to reach.Its concrete measure is as follows: in being lower than 200 rev/mins speed range, control not oil spout, after being higher than this rotating speed, begin to be provided with relatively little oil, this oil mass is that benchmark is demarcated with a specific environment, considers the influence of the working state factors such as (being cold starting or hot exposure) of working environment and motor itself again, revises this oil mass automatically, correction formula is: Mo=Mb+F (Te, Tw)+and Mu, wherein Mo is actual fuel delivery, Mb is the minimum starting oil mass of calibration point, F is a function, Te is an ambient temperature, and Tw is a coolant water temperature, and Mu is unexpected correction value, as not successful, just increase this value automatically in one push start.The accurate function of F is difficult to be determined, has therefore adopted simple linear the correction.After rotating speed is greater than 400 rev/mins, change normal tooth bar control over to.Rotating speed selects 400 rev/mins to be drawn by test, and rotating speed is too high, and the starting time is oversize, and is too low, and limit cigarette effect is bad, and the start-up sequence block diagram is seen Fig. 5.By this measure, motor does not have over-emitting black exhaust, white cigarette phenomenon when starting (cold start-up), and startability is fine.
The present invention adopts two standard speed regulators aspect idle speed control, and governor spring can be regulated fuel injection quantity automatically when idling, and control program only needs as required speed-regulating handle to be adjusted to certain position, and regulating method is exactly simple pid algorithm.In actual track test, we can adjust idling speed arbitrarily according to road conditions and driver's impression, find best idling speed very easily.
Figure 12 is a double fuel workflow sketch.Under normal operating conditions, be in dual fuel mode work, if when something unexpected happened such as tolerance are not enough, also can change 100% pure diesel oil run-mode over to, this also is an advantage of dual-fuel vehicle.Fuel mode is controlled by selector switch.Operating conditions flow process such as Fig. 5: table look-up according to rotating speed and load and to obtain clutch release slave cylinder number, tolerance and oil mass, carry out λ again and optimize and judge, carry out necessary correction and draw the working control value, determine to carry out jet cylinder number by the wheel cylinder strategy again.
Figure 13 is a cylinder deactivation strategy of the present invention.Supercharged engine is when sub load, and more than theory burning required air quantity, excess air coefficient is excessive, causes high discharging greatly for air quantity, and fuel economy is bad.Can motor be at optimum when the sub load in order to make? cylinder stopping technique is adopted near work.Promptly keep the diesel oil of each cylinder is supplied with, and some cylinders are stopped to spray rock gas.Working cylinder is operated under the excess air coefficient condition of optimization.Because the port-sequence-injection system of this research approach can control the natural gas injection of each cylinder regularly, quantitatively.Therefore,, just can accurately carry out " the cylinder deactivation number " of control MAP regulation at any time, realize " cylinder deactivation " of designated cylinders as long as the natural gas injection pulsewidth is set to zero.In addition, motor is caused the nonuniformity of each cylinder working intensity, adopted " randomized " cylinder deactivation strategy for fear of " cylinder deactivation " measure.Its basic thought is, when motor after counting the work certain hour by specific cylinder under the operating mode, according to the rule at random of prior setting, be used for the cylinder number of work by turns, so that the operating time of each cylinder keeps is roughly the same.So-called " randomized " fully on the meaning at random, but " controlled randomized ", after certain circulation of having worked, this work cycle number is determined by test, the principle of determining is frequently to change cylinder working, because this may cause the motor shakiness because of the fluctuation of speed that wheel cylinder brings, can not the time oversize, can lose the meaning of wheel cylinder like this.The realization of wheel cylinder algorithm is to judge by an array ccd, is example during with a cylinder working, and its workflow diagram is seen Figure 13, and judgement symbol is ccd.
Figure 14,15 is that oil mass of the present invention is from calibration strategy.The deviation of bringing owing to the installation of tooth bar and the reasons such as vibrations of motor, can cause the not corresponding of tooth bar-oil mass, thereby can influence power, excess air coefficient optimization, discharging etc., if oil mass is too small, can cause pinking, lose abnormal combustion such as fire, therefore need demarcate correction.The principle of demarcating is that required oil mass value is certain when 1000 rev/mins of no-load runnings of motor (is example with the Styre diesel engine), thereby corresponding tooth bar position also is accurately, as benchmark, and the benchmark of Correction and Control tooth bar MAP.The time of revising is short as far as possible, and adjustment process is steady, reliable results.Demarcation is a nested PID adjustment process, and 1000 rev/mins is the target setting rotating speed, thereby adjusts rotating speed by regulating tooth bar position change fuel delivery.
Figure 16 is an excess air coefficient real-time online correction schematic representation.In the motor actual moving process, the state of ambient atmosphere, rock gas may be different with experimental condition, and this will cause excess air coefficient (λ) to depart from the optimum 1548 of MAP appointment; , therefore, be necessary cylinder deactivation number, natural gas injection amount, diesel injection amount are revised in real time.As shown in Figure 6, ECU gathers the status parameter (temperature, pressure) of rock gas and air inlet air in tube in real time, calculates at that time rock gas, density of the induced air, calculates excess air coefficient (λ) according to look into natural gas injection amount, the cylinder deactivation number got from control MAP then.If λ (dense limit＜λ of the λ＜rare limit of λ) in operating range at that time then adjusts the diesel/natural gas ratio, making | λ-λ is excellent |≤(λ is excellent: the optimum excess air coefficient of MAP storage, σ: the excess air coefficient deviation of permission); If λ at that time exceeds operating range (dense limit＞λ of λ or the rare limit of λ＞λ), then carry out the correction (the cylinder deactivation number is zero or 6, directly carries out the ratio adjustment of diesel/natural gas) of cylinder deactivation number.At last, carry out control according to revised cylinder deactivation number, natural gas injection amount, diesel injection amount to motor.
Figure 17 is that cylinder is counted the correction flow chart.After adopting mainshaft stops working,, will inevitably cause the nonuniformity of each cylinder working intensity of motor, reduce the operating life of motor if do not take measures.For this reason, in program, designed software algorithm, in order to realize the wheel cylinder working based on " controlled random numbers ".If but each cylinder working can cause the fluctuation of rotating speed when inhomogeneous in the wheel cylinder process, can reduce this fluctuation to the nonuniformity correction of snifting valve.
When definite clutch release slave cylinder is counted, determine the clutch release slave cylinder number by look-up table and according to " rounding up " principle earlier.If determine but just press cylinder deactivation MAP, when engine speed or the less variation of load generation, all may cause the frequent variations of cylinder number at critical place, have a strong impact on the stability and the reliability of motor.Therefore guarantee also need adopt the jet amount " threshold value method " of establishing certain overlap region except needing the appropriate design cylinder deactivation to count MAP,, or just can not become again immediately after the cylinder transformation of variables in order to assurance or constant clutch release slave cylinder number.So-called " threshold value method " be meant, when finding that when tabling look-up needing to change clutch release slave cylinder counts, have only when natural gas jet quantitative changeization greater than predefined thresholding (threshold value) and keep certain hour and just think to change effectively.Thresholding need be determined by experiment, can not too greatly can not be too little, and the big responsiveness that influences motor, too little amazing effect.In programming, because the cylinder of each operating mode is counted difference, adopted " variable threshold value method ", it is 3.5 comparatively suitable that experiment has drawn rock gas/air excess air coefficient.Flow diagram is seen Figure 17.
Fluctuation of speed situation when Figure 18 has provided 1400 rev/mins and 2200 rev/mins from 1 cylinder working to 6 cylinder working conversion processes, in clutch release slave cylinder transformation of variables process, the fluctuation of motor is very little as can be seen.Fluctuation of speed scope during 1400 rev/mins of 2200 rev/mins of ratios is big slightly, but wave range can be accepted all less than 1%.It can also be seen that from figure, is maximum all fluctuations from 1 cylinder to 2 cylinder transforming process.This is because in this transition, if do not take measures, single cylinder tolerance value can be very big in certain zone, thereby make the too dense initiation pinking of mixed gas.Therefore in software, maximum functional tolerance has been done restriction to be handled, the tolerance of the part that transfinites is amounted to into oil mass, with guaranteed output, thereby make 1 cylinder change slightly greatly to 2 cylinder working transition middle racks, thus cause the fluctuation of speed excessive, and count in the transient process at all the other cylinders, the transition of single cylinder tolerance is smoother, and the tooth bar transition is steady.
Fluctuation of speed figure when Figure 19 is 1400 rev/mins of oil gas switchings.Fluctuation of speed figure when Figure 20 is 2200 rev/mins of oil gas switchings.Experimental result shows, uses rock gas work when little load, and rock gas can not fully burn, thus we to have set 25% rated load be the critical load point, only be higher than this transition point and just begin jet.Therefore under dual fuel mode from diesel oil work to double fuel work transient process, a tooth bar conversion process is arranged, need to adjust the tooth bar position and reduce oil mass, if both tooth bar positions differ greatly, will cause the motor shake, cause the fluctuation of rotating speed.For the air feed control procedure, we adopt is opening time of control electromagnetic valve to realize sequence-injection, faster system response, the problem that fuel supply lags behind is not obvious, therefore not really violent (maximum fluctuation is 80 rev/mins 1400 rev/mins the time in the fluctuation of whole process, more apparent in view in the time of 2200 rev/mins, 220 rev/mins of up).The control strategy of taking is: for the adjustment process of tooth bar, just can realize seamlessly transitting by simple first-order filtering, and to the supply process of gas, in the process of transition, put aside excess air coefficient optimization, table look-up tolerance to certain value (as, when single cylinder tolerance was 20mg/st, this value did not generally satisfy optimum excess air coefficient), promptly begin 1 cylinder working, carry out the transition to normal working procedure again.And before this value, need compensate in the oil by increasing the diesel oil amount according to the heat of calorific value with tolerance.Otherwise, also take identical strategy when the 0 cylinder transition from 1 cylinder.Handoff procedure rotating speed ripple curve when a of Figure 18 and Figure 19 partly is respectively 1400 rev/mins and 2200 rev/mins, b is partly for taking the fluctuation situation behind the first-order filtering, as seen the fluctuation of speed reduces to 30 and 90 rev/mins by 80 and 220 respectively after adopting the filtering strategy under two kinds of rotating speeds, and the control effect is obvious.
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