CN106545452A - A kind of oil/CNG dual fuel engine electronic spark advance devices and advance angle control optimization method - Google Patents
A kind of oil/CNG dual fuel engine electronic spark advance devices and advance angle control optimization method Download PDFInfo
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- CN106545452A CN106545452A CN201610869257.XA CN201610869257A CN106545452A CN 106545452 A CN106545452 A CN 106545452A CN 201610869257 A CN201610869257 A CN 201610869257A CN 106545452 A CN106545452 A CN 106545452A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
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- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
The present invention provides a kind of oil/CNG dual fuel engine electronic spark advance devices, including MCU；Differential signal generates process circuit, and the crankshaft-position signal for MCU is transmitted is converted into differential signal output circuit；Power module；Communication module, for being communicated between electronic spark advance device and host computer.The present invention also provides a kind of oil/CNG dual fuel engine ignition advance angle control optimization methods, including：STP1：After MCU obtains crankshaft-position signal, the hypodontia of bent axle is caught；STP2：According to the hypodontia of bent axle, the bent axle number of teeth of a week is calculated, while calculating the corner number of degrees between adjacent teeth；STP3：By MAP computings, the ignition advance angle for needing under current working in advance is calculated；STP4：According to the crank angle between adjacent teeth and needs angle value in advance, position when calculating next tooth simulation output.The advancing device of the present invention can realize the type of the adjustment of ignition advance angle, system energy automatic identification crankshaft signal and camshaft signal under full working scope.
Description
Technical field
The present invention relates to a kind of oily CNG dual fuel engines electronic spark advance device and control ignition advance angle optimization method.
Background technology
With environment deterioration and Abgasgesetz it is increasingly strict, natural gas is so that its rich reserves, exhaust emission be few, Jing
The features such as Ji property is good becomes good alternative motor fuels.Natural gas is main with compressed natural gas on automobile at present（CNG）Shape
Formula realizes that oil/gas dual-purpose fuel pattern works.Increase a set of air supply system and control system on former car（Combustion gas ECU）, combustion gas
ECU obtains the former parameter such as car fuel oil injection pulse width and rotating speed, while reading and according to the long-term fuel oil amendment of former car ECU（long
fuel trim）With short-term combustion amendment（short fuel trim ）Value determines fuel gas injection pulsewidth.Simultaneously according to natural gas
The difference of the characteristic of characteristic and oil suitably adjusts ignition advance angle.The controller of oil/gas integral type is also immature at present, and igniting is carried
Mainly by the electronic spark advance device that installs additional realizing, existing electronic spark advance device angle in advance has 6 for the adjustment of anterior angleoCA、
9oCA、12 oCA and 15oCA, it is impossible to realize the adjustment of other angles, and angle in advance immobilizes in the range of full working scope,
Can not be adjusted according to operating mode.It is known that ignition advance angle is to the discharge performance of electromotor, economy, dynamic property, rotating speed
There is important impact with delivery temperature etc., it is therefore desirable to which continuously adjustable electronic spark advance device meets demand in the range of full working scope.
The content of the invention
The technical problem to be solved in the present invention is that offer a kind of achievable 0.1 °C of A continuously adjustabes, range of accommodation are reachable
0.1 °C of A ~ 20 °C A and the electronic spark advance device that can be demarcated according to operating mode, to solve the problems, such as prior art.
The present invention is employed the following technical solutions：
A kind of oil/CNG dual fuel engine electronic spark advance devices, including
MCU, for receiving the extraneous throttle position signal being input into, oil/gas switching signal, crankshaft-position signal；
Differential signal generates process circuit, for MCU is exported in advance after crankshaft-position signal to be converted into differential signal defeated
Go out circuit；
Power module, for powering for the power circuit of electronic spark advance device；
Communication module, for being communicated between electronic spark advance device and host computer.
Also include crankshaft signal processing module, the crankshaft-position signal is by crankshaft signal processing module to signal condition
After, send a signal to MCU.
Also include the redundant circuit I being arranged between crankshaft signal processing module and MCU, when electronic spark advance device normal work
When, the crankshaft-position signal through crankshaft signal processing module is by, after redundant circuit I, crankshaft-position signal being exported
To MCU, when electronic spark advance device breaks down, after the crankshaft-position signal passes through redundant circuit I, by crankshaft-position signal
Export to ECU.
The MCU is additionally operable to receive camshaft-position signal, now, camshaft-position signal Jing camshaft signals conditioning mould
Export after block conditioning to MCU, camshaft location letters of the MCU after output in advance after the process of camshaft signal output module
Number, redundant circuit II, when electronic spark advance device normal work, the cam are set between camshaft signal conditioning module and MCU
After shaft position signal passes through redundant circuit II, crankshaft-position signal is exported to MCU, when electronic spark advance device breaks down,
The camshaft-position signal is by, after redundant circuit II, crankshaft-position signal being exported to ECU.
The electronic spark advance device also includes relay, and the relay is normally closed relay, when the normal work of electronic spark advance device
When making, MCU control relays disconnect, and crankshaft-position signal and camshaft-position signal are exported to MCU, when electronic spark advance device occurs
During failure, relay is closed, and crankshaft-position signal and camshaft-position signal are by exporting to ECU after relay.
The differential signal output circuit includes the first audion Q1, the second audion Q2, the 3rd audion Q3, the one or three
The emitter-base bandgap grading of the colelctor electrode of pole pipe Q1 and the second audion Q2 is all connected with power module, and the base stage of the second audion Q2 passes sequentially through
After six resistance R6 and the 4th resistance R4, connect the base stage of the first audion Q1, the colelctor electrode of the 3rd audion Q3 is connected to the 6th
Between resistance R6 and the 4th resistance R4, the emitter-base bandgap grading connection power module of the 3rd audion Q3, the base stage of the 3rd audion Q3 are received
MCU outputs in advance after crankshaft-position signal, the colelctor electrode output two of the emitter-base bandgap grading of the second audion Q2 and the first audion Q1
Road differential signal, meanwhile, the emitter-base bandgap grading of the second audion Q2 connects power module, the collection of the first audion Q1 by first resistor R1
Electrode connects power module by second resistance R2.
A kind of oil/CNG dual fuel engine ignition advance angle control optimization methods, including：
STP1：After MCU obtains crankshaft-position signal, the hypodontia of bent axle is caught；
STP2：According to the hypodontia of bent axle, the bent axle number of teeth of a week is calculated, and each tooth is numbered, while calculating adjacent teeth
Between the corner number of degrees；
STP3：By MAP computings, the ignition advance angle for needing under current working in advance is calculated；
STP4：Step-length every time in advance between adjacent teeth is pre-set, is carried according to the crank angle between adjacent teeth and needs
Front angle value, position when calculating next tooth simulation output, calculates output gear according to the cycle of tooth, turn meter is recently input
Cycle T, recently input week of the half as the high level of simulation output tooth that the tooth rim phase deducts the degree of advance corresponding time
Phase Th, T deduct Th as low level cycle T l of simulation output tooth, next to be currently input into the information prediction of tooth during calculating
In the individual tooth cycle in advance, after under current working, bent axle needs advance angle in advance in reach STP3, no longer shift to an earlier date.
Rational time range is set to the time relationship of two adjacent teeth to verify, if next tooth in advance
Time exceed setting time scope, then in the circulation rest period, advance angle no longer shifts to an earlier date.
Step-length between the adjacent teeth pre-set in the STP4 every time in advance is 0.1 °C of A, and ignition advance angle adjusts model
Enclose for 0.1 °C of A ~ 20 °C A.
In above-mentioned STP4, when prediction calculates the cycle in advance of next tooth under current working, while calculating under current working
Angular acceleration between adjacent teeth, it is pre- by the cycle, angular velocity and the ignition advance angle that are input into tooth under angular acceleration, current working
Survey and calculate the next tooth cycle that the angle needs in advance.
Beneficial effects of the present invention：（1）Electronic spark advance device can realize the demarcation and adjustment of ignition advance angle under full working scope,
The type of system energy automatic identification crankshaft signal and camshaft signal, it is adaptable to current major part vehicle.（2）Hardware circuit is adopted
Redundancy Design method, lose in the case that power supply, single-chip microcomputer lose normal function in electronic spark advance device, camshaft signal and
Crankshaft signal still can be exported by primary signal, improve the reliability of system.（3）Analogue signal is exported using location positioning
Method eliminates the accumulation of error, improves the positional precision of output signal, and minimum advance angle is 0.1oCA, full aduance are 20oCA。
Description of the drawings
Fig. 1 is schematic diagram after the crankshaft-position signal before processing of electronic spark advance device.
Fig. 2 is the electrical block diagram of electronic spark advance device of the present invention.
Fig. 3 is the circuit diagram of crankshaft signal processing module of the present invention.
Fig. 4 is the redundant circuit schematic diagram of the present invention.
Fig. 5 is differential signal voltage change-over circuit schematic diagram.
Fig. 6 is the schematic diagram that differential signal generates process circuit.
One oscillogram of input and output signal of the Fig. 7 for Fig. 6 circuits.
Fig. 8 is that the simulation of next tooth of the prediction of the present invention shifts to an earlier date output principle schematic diagram.
Specific embodiment
Below in conjunction with the accompanying drawings 1 ~ 9 and specific embodiment the present invention is described in further detail.
In prior art, engine crankshaft position sensor is usually magnetoelectric sensor, according to the rotating speed of electromotor not
With the differential signal of the output two-way level sine wave different with frequency；CMPS Camshaft Position Sensor is hall sensor, defeated
Go out the TTL signal of 5V.When the ECU of former machine works, according to the feature tooth and crank position of CMPS Camshaft Position Sensor input signal
The feature tooth of sensor input signal is realized synchronous.After synchronization, the value that the angle of electronic spark advance is inquired about by MAP is according to existing calculation
Method, calculating certain position in crankshaft signal carries out triggering igniting.
And during the work of electronic spark advance device, two-way crankshaft-position signal, throttle position signal, camshaft-position signal（Can
Not connect）, oil/gas switching switching signal input igniting advancing device.Crankshaft-position signal Jing process circuits are shaped to as shown in Figure 1
Electronic spark advance before signal input to electronic spark advance device processor, angle in advance as needed, processor output shift to an earlier date
Crankshaft-position signal afterwards, signal Jing differential signal process circuits export the differential signal of two-way 5V.
Camshaft-position signal and crankshaft-position signal are the bases that electromotor control igniting and oil spout sequential judge, which is heavy
The property wanted is self-evident.As electronic spark advance device is connected in camshaft-position signal and crankshaft-position signal circuit.Therefore, must
Electronic spark advance device stable performance, reliable operation must be guaranteed, when electronic spark advance device is faulty can not work, former machine ECU is just remained to
Often work.Redundant circuit and relay circuit is adopted to ensure normal works of the ECU in failure in the present invention
Conventional camshaft signal type has n+1 at present（N is cylinder number）And 4+4（4 long tooths, 4 short teeth）；Bent axle
The type of signal has 60-2 and 36-2, and system needs the type of energy automatic identification signal to improve the universality of electronic spark advance device.
As shown in Fig. 2 oil/CNG dual fuel engine electronic spark advance devices that the present invention is provided, including the place of electronic spark advance device
Reason device MCU, MCU receive the extraneous throttle position signal being input into, oil/gas switching signal, crankshaft-position signal, and are located
Reason, also including differential signal generate process circuit, the circuit MCU export shift to an earlier date after crankshaft-position signal be converted into difference
Signal output.Also include power module, power module is converted to 5V from 12V power supply, be that the power circuit of electronic spark advance device is supplied
Electricity.Host computer is connected by the communication module of serial communication also on MCU, realizes that by host computer the optimum igniting of full working scope shifts to an earlier date
The demarcation at angle.
Throttle position signal and oil/gas switching signal are nursed one's health signal output later to MCU by signal conditioning circuit,
The signal conditioning circuit is filtered shaping mainly for throttle position signal and oil-gas switch switching signal.Because in order to pacify
For the sake of complete, electronic throttle door position signal exports the signal of two-way 0-5V, increases with the aperture of air throttle all the way and becomes big, another
Road is reduced with the increase of the aperture of air throttle, and the voltage sum of two-way is equal to 5V.The throttle signal connect in the present invention
It is the signal for increasing with aperture and increasing, which is filtered using single order RC low-pass filter circuits.Oil/gas switching signal is one
Individual switching value, the signal take from the voltage at the high-pressure solenoid valve of gas burning system, therefore the voltage is 12V, need to adopt resistance
Partial pressure mode is sampled, while the shake of signal is eliminated by the existing software for eliminating shake.
As existing crankshaft-signal sensor is magneto-electric, when rotating speed is high, the voltage of output signal is high, and works as and turn
When speed is low, the signal voltage of output is low, during according to fixed threshold value process signal, the crankshaft signal facewidth after process can because
Rotating speed is different and different, so as to cause by the positioning such as the calculated rotating speed of crankshaft signal and igniting, oil spout " distortion ".Cause
This, it is desirable to provide crankshaft-position signal is carried out nursing one's health later crankshaft signal processing module, the signal after conditioning is sent to
MCU.In the present invention, as shown in figure 3, using the input of integrated differential signal and the MAX9924 cores of the function of adaptive peak thresholding
Piece is nursed one's health to the crankshaft-position signal that VR crankshaft sensor is exported, wherein, IN+ and IN- is that the two-way of input is bent
Shaft position signal.The two paths of differential signals of crankshaft sensor is separately input to first pin and second pin of MAX9924 chips,
Signal after shaping is exported from the 6th pin.
In the present invention, MCU is additionally operable to receive camshaft-position signal, now, camshaft-position signal Jing camshaft signals
Export after conditioning module conditioning to MCU, cam axle positions of the MCU after output in advance after the process of camshaft signal output module
Confidence number, camshaft signal conditioning module are existing module.
And processor MCU, the single-chip microcomputer of MC9S12GN32 20-PIN TSSOP encapsulation is employed in the present invention as igniting
The processor of advancing device, the electronic throttle gate signal to being input into carries out A/D samplings, oil/gas switching signal to be carried out judging, and carries out
Degree of advance MAP computings, crankshaft-position signal and camshaft-position signal input and output process etc..The single-chip microcomputer is through optimization
16 8-digit microcontroller of automotive grade, with low cost, high-performance, pin number it is few the features such as.Bus frequency is 16MHz's
S12CPU kernels, flash memory on 32KB pieces, 1KB EEPROM, 2K RAM, built-in 1MHz clocks can be configured to 6 10 precision in tunnel
A/D is changed, and timing channel, 1 general Asynchronous Reception/transmitter are compared in 8 16 input capture/outputs（UARTs）, 68
Position or 16,3 tunnels PWM passages, 1 programmable periodic interruptions intervalometer（API）With a real-time interrupt（RTI）, software guards the gate
Canis familiaris L..As MCU processors employ MC9S12GN32 single-chip microcomputers, therefore nursed one's health by the crankshaft signal of crankshaft signal modulate circuit
Processor MCU is input to into 5V.
In order that electronic spark advance device is faulty when can not work, former machine ECU remains to normal work, need to be in electronic spark advance device
Redundant circuit as shown in Figure 4 is set in circuit, and the redundant circuit includes structure identical redundant circuit I and redundant circuit II,
Redundant circuit I is connected between crankshaft signal processing module and MCU, redundant circuit II be arranged on camshaft signal processing module and
Between MCU.The redundant circuit includes the 7th resistance R7 being connected with MCU, and the first diode D1, the 8th electric being connected with ECU
The series circuit of resistance R8, one end of the 7th resistance R7 is connected with the positive pole of the first diode D1, crankshaft-position signal and camshaft
Position signalling inputs a signal into one end that one end of the 7th resistance R7 is connected with the first diode D1.
Under normal circumstances, the 7th of 100 Ω of signal Jing of crankshaft position sensor and CMPS Camshaft Position Sensor output the is electric
Resistance R7 is input to processor MCU, and processor is to the analogue signal after ECU output adjustments；When processor breaks down, it is impossible to just
Often during output signal, the 8th resistance R8 of the signal Jing the first diode D1 and 4.7k Ω that are now input into is exported to ECU, output
Though signal in advance, does not still ensure that engine work.
Meanwhile, crankshaft-position signal and camshaft-position signal enter into rear class electricity after a normally closed relay
Road, the break-make of relay are controlled by the processor of system, and when system is working properly, relay disconnects, and the signal of input is directly defeated
Processed in entering processor；When exception and cisco unity malfunction occurs in system, relay is in closure state and signal is logical
Cross relay and be directly inputted to ECU, it is ensured that engine work.
Processor output in advance after bent axle analogue signal, need to be converted into differential signal output, former machine ECU could know
The not other signal, electronic spark advance device used in the market is the output that differential signal is realized using transformator, transformator work
When produce electromagnetic interference, affect the stability of system, while the signal noise of output is more, reduce the reliability of system.
Differential signal output processing circuit includes the first audion Q1, the second audion Q2, the 3rd audion Q3, the one or three
The emitter-base bandgap grading of the colelctor electrode of pole pipe Q1 and the second audion Q2 is all connected with power module, and the base stage of the second audion Q2 passes sequentially through
After six resistance R6 and the 4th resistance R4, connect the base stage of the first audion Q1, the colelctor electrode of the 3rd audion Q3 is connected to the 6th
Between resistance R6 and the 4th resistance R4, the emitter-base bandgap grading connection power module of the 3rd audion Q3, the base stage of the 3rd audion Q3 are received
MCU outputs in advance after crankshaft-position signal, the colelctor electrode output difference of the emitter-base bandgap grading of the second audion Q2 and the first audion Q1
Two crankshaft-position signals after being divided to, meanwhile, the emitter-base bandgap grading of the second audion Q2 connects power module by first resistor R1, and first
The colelctor electrode of audion Q1 connects power module by second resistance R2.First audion Q1, the second audion Q2 are
MMUN2211L audions, the 3rd audion Q3 are BCR553 audions, and first resistor R1, second resistance R2 are drop-down and pull-up
Resistance.When IN ends input low level, Q1, Q2, Q3 are both turned on, and OUT+ and OUT- moves -5V and+5V respectively to（Ignore audion
Pressure drop）, when IN ends input high level, Q1, Q2, Q3 are turned off, and now OUT+ and OUT- export+5V and -5V respectively, its input
Output waveform logic chart is as shown in Figure 7.
When output difference signal, the power input of differential signal output circuit needs the conversion for realizing negative voltage, if
Using the LMC7600 chips of National Semiconductor, timing realizes that positive electricity is pressed onto the conversion of negative voltage, the chip can by+
Positive voltage mirror transformation between 1.5-+10V is negative voltage, while the chip has various different usages, realizes different voltages
Output.As the crankshaft-position signal process circuit of ECU employs the functional circuit of adaptive peak thresholding, differential signal
Voltage is capable of achieving self-adaptative adjustment in larger voltage range, therefore using the common usage as shown in Fig. 5, be input into+
The voltage of 5V, output-the 5V, -5V of output connects the emitter-base bandgap grading of the emitter-base bandgap grading and the first audion Q1 of the second audion Q2.
The present invention also provides the optimization method that a kind of oil/CNG dual fuel engines control ignition advance angle, including：
STP1：After MCU obtains crankshaft-position signal, the feature tooth of bent axle is caught（That is hypodontia）；
STP2：According to the hypodontia of bent axle, the bent axle number of teeth of a week is calculated, and each tooth is numbered, while calculating adjacent teeth
Between crankshaft angle in degrees；The number of the crank teeth of calculating present engine is needed, phase is calculated according to the number of crank teeth
Crankshaft angle in degrees between adjacent two teeth；
STP3：By MAP computings, calculating crankshaft-position signal under current working needs the number of degrees of ignition advance angle in advance, should
The number of degrees are obtained from MAP tables；
STP4：Pre-set between adjacent teeth step-length every time in advance, then according under current working according between adjacent teeth
Crank angle and needs angle value in advance, position when calculating next tooth simulation output（That is angle）, according to recently inputting
The cycle of tooth, turn meter calculate the cycle T of output gear, recently input the half that the tooth rim phase deducts the degree of advance corresponding time
Used as cycle T h of the high level of simulation output tooth, T deducts Th as low level cycle T l of simulation output tooth, equal during calculating
To be currently input into the information prediction next one tooth of the tooth cycle in advance, under current working, bent axle needs to shift to an earlier date in reach STP3
Advance angle after, no longer shift to an earlier date.
Consider during above-mentioned calculating that the cycle is because the MCU of electronic spark advance device when calculating, calculating is not angle, because angle
Degree cannot be calculated, the time for really needing angle in advance to turn over, the time according to required for rotating speed calculates a tooth.
Step-length between the adjacent teeth pre-set in STP4 every time in advance is 0.1 °.Minimum ignition advance angle is 0.1 °
CA, maximum ignition advance angle are 20 °C of A.
In above-mentioned STP4, when prediction calculates the cycle in advance of next tooth under current working, while calculating under current working
Angular acceleration between adjacent teeth, it is pre- by the cycle, angular velocity and the angle in advance that are input into tooth under angular acceleration, current working
Survey and calculate the next tooth cycle that the angle needs in advance.
Consider that acceleration is because simultaneously when calculating next tooth angle in advance：When ignition advance angle shifts to an earlier date, according to work as
The information of the tooth of front input（Tooth number, cycle, angular velocity etc.）During the position that the next tooth of prediction occurs, need to export simulation one by one
Crankshaft signal after in advance.When being worked due to electromotor, even if in the steady state, in a circulation, the transient speed of electromotor
It is fluctuation, therefore in order to improve the degree of accuracy of prediction, by acceleration correcting each tooth outgoing position.The meter of the acceleration
Calculation method can pass through the angular velocity for calculating a upper tooth and when nipper angular velocity difference and the computation of Period for turning over.
Rational time range is set to the time relationship of two adjacent teeth, if the time in advance of next tooth surpasses
Go out setting time scope, then, in the circulation rest period, advance angle no longer shifts to an earlier date.
Bent axle turns over the cycle of each tooth in the range of a circle（That is time）It is equal, if having acceleration, by
It is limited in the excursion of acceleration so that the time for turning over each tooth is unequal, but it is limited in certain scope, if
Electromotor is subject to external disturbance such as electromagnetic interference to produce burr or lose a tooth, it is possible that will when calculating next tooth
Burr signal regards true tooth or the situation by next but one tooth as next tooth occurs, that is, there are feelings that are multiple tooth or losing tooth
Condition, can make a mistake when now calculating advance angle, therefore, after electromotor captures each crank teeth, be between adjacent teeth
Cycle carry out rational inspection, during preventing from calculating due to lose tooth or it is multiple tooth cause electronic spark advance when the mistake that settles at one go
By mistake.Now the rotating speed according to electromotor, sets the time range of rational relation to the time relationship of two adjacent teeth, for example
0.7T+1.8T（T be it is nonaccelerated in the case of turn over cycle of each tooth）, under current rotating speed, calculate the advance angle of this circle
When, if the next tooth time in advance exceeds setting time scope, under current rotating speed, bent axle is calculated when shifting to an earlier date foot, this
Advance angle, electromotor no longer oil spout or CNG are calculated no longer in circle.Must progressively mention according to certain step-length when therefore in advance
After the count value that desired value, the position for calculating advance signal and the high level and low level of simulating tooth should be exported, appropriate
Tooth number at triggering interrupt, export analogue signal one by one, it is as shown in Figure 9 that simulation shifts to an earlier date output principle schematic diagram.
As shown in Figure 9, θ is the crank angle between each tooth, and system determines the value, θ according to the number of teeth of a week2It is phase
Angle value between adjacent two teeth in advance, the system value are set to 0.1oCA, when in advance, can shift to an earlier date at any tooth, the present invention
It is set in after hypodontia at No. 1 tooth（Rising edge）Shifted to an earlier date, the cycle of simulation output tooth there are many algorithms, the cycle is through meter
It is assigned to export the corresponding depositor for comparing pin after calculation, then exports analogue signal, during intermediate operations, there is time delay.In Fig. 9
T1、t2、t3、t4If the time that value is all calculated according to the cycle for recently inputting tooth and according to angular velocity and goniometer in advance
Each tooth of analogue signal after carrying out computing, is exported, then there is the accumulation of error, in order to improve the precision of output signal,
Location positioning output method is present invention employs, i.e., when predicting the degree of advance of next tooth every time, by calculating when nipper.Each
After the rising edge of tooth catches, according to the crank angle between adjacent teeth and angle in advance, next tooth simulation output is calculated
When position（Angle）（If angle in advance is more than the crank angle between adjacent teeth, calculates at the rising edge of last tooth and work as
The parameter of nipper output）, according to the cycle T for recently inputting the cycle of tooth, turn meter and calculating output gear, recently input the tooth rim phase
Deduct the cycle T of the half as the high level of simulation output tooth of degree of advance corresponding timeh, T deducts ThAs simulation output
The low level cycle T of toothl, such delay error is limited in a tooth, and there is no error accumulation.
Advance angle is that the angle under current working in advance deducts last operating mode angle in advance, if difference is just, is illustrated
Last time continues to shift to an earlier date on the basis of shifting to an earlier date, if negative value, illustrates to postpone on the basis of last time shifts to an earlier date backward.
Above-described is only the preferred embodiment of the present invention, it is noted that for a person skilled in the art,
Under the premise of without departing from general idea of the present invention, some changes and improvements can also be made, these should also be considered as the present invention's
Protection domain.
Claims (10)
1. a kind of oil/CNG dual fuel engine electronic spark advance devices, it is characterised in that：Including
MCU, for receiving the extraneous throttle position signal being input into, oil/gas switching signal, crankshaft-position signal；
Differential signal generates process circuit, for MCU is exported in advance after crankshaft-position signal to be converted into differential signal defeated
Go out circuit；
Power module, for powering for the power circuit of electronic spark advance device；
Communication module, for being communicated between electronic spark advance device and host computer.
2. a kind of oil according to claim 1/CNG dual fuel engine electronic spark advance devices, it is characterised in that：Also include song
Axis signal processing module, after the crankshaft-position signal passes through crankshaft signal processing module to signal condition, signal is sent
To MCU.
3. a kind of oil according to claim 2/CNG dual fuel engine electronic spark advance devices, it is characterised in that：Also include setting
The redundant circuit I between crankshaft signal processing module and MCU is put, it is when electronic spark advance device normal work, described through bent axle
The crankshaft-position signal of signal processing module is by, after redundant circuit I, crankshaft-position signal being exported to MCU, when igniting is carried
When front device breaks down, the crankshaft-position signal is by, after redundant circuit I, crankshaft-position signal being exported to ECU.
4. a kind of oil according to claim 1/CNG dual fuel engine electronic spark advance devices, it is characterised in that：The MCU
It is additionally operable to receive camshaft-position signal, now, camshaft-position signal is exported Jing after the conditioning of camshaft signal conditioning module
To MCU, camshaft-position signals of the MCU after output in advance after the process of camshaft signal output module, camshaft signal are adjusted
Redundant circuit II is set between reason module and MCU, and when electronic spark advance device normal work, the camshaft-position signal is by superfluous
After remaining circuit II, crankshaft-position signal is exported to MCU, when electronic spark advance device breaks down, the camshaft location letter
Number by after redundant circuit II, crankshaft-position signal being exported to ECU.
5. a kind of oil according to claim 4/CNG dual fuel engine electronic spark advance devices, it is characterised in that：The igniting
Advancing device also includes relay, and the relay is normally closed relay, when electronic spark advance device normal work, MCU control relays
Device disconnects, and crankshaft-position signal and camshaft-position signal are exported to MCU, and when electronic spark advance device breaks down, relay is closed
Close, crankshaft-position signal and camshaft-position signal are by exporting to ECU after relay.
6. a kind of oil according to claim 1/CNG dual fuel engine electronic spark advance devices, it is characterised in that：The difference
Signal output apparatus include the first audion（Q1）, the second audion（Q2）, the 3rd audion（Q3）, the first audion（Q1）'s
Colelctor electrode and the second audion（Q2）Emitter-base bandgap grading be all connected with power module, the second audion（Q2）Base stage to pass sequentially through the 6th electric
Resistance（R6）With the 4th resistance（R4）Afterwards, connect the first audion（Q1）Base stage, the 3rd audion（Q3）Colelctor electrode be connected to
6th resistance（R6）With the 4th resistance（R4）Between, the 3rd audion（Q3）Emitter-base bandgap grading connection power module, the 3rd audion
（Q3）Base stage receive MCU outputs in advance after crankshaft-position signal, the second audion（Q2）Emitter-base bandgap grading and the first audion
（Q1）Colelctor electrode output two paths of differential signals, meanwhile, the second audion（Q2）Emitter-base bandgap grading pass through first resistor（R1）Connection electricity
Source module, the first audion（Q1）Colelctor electrode pass through second resistance（R2）Connection power module.
7. a kind of oil/CNG dual fuel engine ignition advance angle control optimization methods, it is characterised in that：Including：
STP1：After MCU obtains crankshaft-position signal, the hypodontia of bent axle is caught；
STP2：According to the hypodontia of bent axle, the bent axle number of teeth of a week is calculated, and each tooth is numbered, while calculating adjacent teeth
Between the corner number of degrees；
STP3：By MAP computings, the ignition advance angle for needing under current working in advance is calculated；
STP4：Step-length every time in advance between adjacent teeth is pre-set, is carried according to the crank angle between adjacent teeth and needs
Front angle value, position when calculating next tooth simulation output, calculates output gear according to the cycle of tooth, turn meter is recently input
Cycle T, recently input week of the half as the high level of simulation output tooth that the tooth rim phase deducts the degree of advance corresponding time
Phase Th, T deducts ThAs the low level cycle T of simulation output toothl, it is next to be currently input into the information prediction of tooth during calculating
In the individual tooth cycle in advance, after under current working, bent axle needs advance angle in advance in reach STP3, no longer shift to an earlier date.
8. the optimization method of a kind of oil according to claim 7/CNG dual fuel engine ignition advance angles, its feature exist
In：Rational time range is set to the time relationship of two adjacent teeth to verify, if next tooth in advance when
Between exceed setting time scope, then in the circulation rest period, advance angle no longer shifts to an earlier date.
9. a kind of oil according to claim 7/CNG dual fuel engines control the optimization method of ignition advance angle, and which is special
Levy and be：Step-length between the adjacent teeth pre-set in the STP4 every time in advance is 0.1 °C of A, and ignition advance angle adjusts model
Enclose for 0.1 °C of A ~ 20 °C A.
10. the optimization method of a kind of oil according to claim 7/CNG dual fuel engine ignition advance angles, its feature exist
In：In above-mentioned STP4, when prediction calculates the cycle in advance of next tooth under current working, while calculating the adjacent teeth under current working
Between angular acceleration, calculated by the prediction of cycle of tooth, angular velocity and ignition advance angle is input under angular acceleration, current working
The next tooth cycle that the angle needs in advance.
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| CN114017235A (en) * | 2021-09-30 | 2022-02-08 | 北京合升众成科技有限公司 | Gas ignition method for ignition coil of oil-gas dual-purpose fuel vehicle |
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| CN106545452B (en) | 2018-07-06 |
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