CN104005863A - Diesel/natural gas active blending combustion electronic control system and method - Google Patents
Diesel/natural gas active blending combustion electronic control system and method Download PDFInfo
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- CN104005863A CN104005863A CN201410218915.XA CN201410218915A CN104005863A CN 104005863 A CN104005863 A CN 104005863A CN 201410218915 A CN201410218915 A CN 201410218915A CN 104005863 A CN104005863 A CN 104005863A
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Abstract
The invention discloses a diesel/natural gas active blending combustion electronic control system and method. The electronic control system comprises a single-chip microprocessor, a natural gas nozzle intelligent drive circuit, a diesel nozzle drive circuit, a pure diesel mode/active blending combustion mode diverter switch, a load signal processing circuit and a self-adapting processing circuit, wherein the natural gas nozzle intelligent drive circuit, the diesel nozzle drive circuit, the pure diesel mode/active blending combustion mode diverter switch, the load signal processing circuit and the self-adapting processing circuit are respectively connected with the single-chip microprocessor. The load signal processing circuit receives a detection signal of an engine load sensor. The self-adapting processing circuit receives a detection signal of a crankshaft position sensor. The crankshaft position sensor measures the rotating position and the rotating speed of an engine crankshaft. The electronic control system is connected with an original diesel engine electronic control system in parallel and does not depend on the original diesel engine electronic control system, and therefore the optimal control over fuel-injection quantity, gas-injection quantity and fuel injection timing for blending combustion is achieved; besides, the detonation phenomenon which may occur in the passive blending combustion process of dual fuel is avoided fundamentally, and the reliability of long-term work of a dual-fuel engine is guaranteed.
Description
Technical field
The present invention relates to engine electronic control system field, particularly a kind of diesel/natural gas is initiatively mixed and is burnt automatical control system and method.
Background technique
Do under the prerequisite of any change in the engine mechanical part to Design of High Pressure Common Rail Diesel Engine not, install a set of natural gas supply device (generally adopting engine cylinder external admission road air feed) additional to motor and just can realize diesel engine and mix burning rock gas.Owing to being that two kinds of fuel burn simultaneously, thus be referred to as to mix burning, to distinguish single fuel combustion.This double fuel is mixed to burn two large advantages: the Design of High Pressure Common Rail Diesel Engine automatical control system of (1) diesel engine and the configuration of former factory is constant, has both met the requirement of Chinese law and regulations, continues to enjoy again the service on 3-guarantees after sale of former factory.(2) can obtain economical economic benefit and the social benefit of energy-saving and environmental protection.
From function aspects, diesel/natural gas dual-fuel is mixed burning engine system and is divided into diesel injection control and natural gas injection control two-part.The core that double fuel is mixed burning automatical control system is to mix to burn ECU (electronic control unit).Diesel/natural gas is mixed in burning, diesel oil mainly play ignite cannot compression ignite rock gas effect, compared with pure diesel fuel mode, mix while burning and must significantly reduce original diesel injection amount, so bifuel system focuses on how to reduce the diesel injection amount that the former ECU of factory (electronic control unit) controls at present, mainly contain two large class methods: method 1, design an emulsification and provide simulate signal to former diesel oil automatical control system, the ECU of Shi Yuan factory reduces diesel oil delivery volume; Method 2, design electronic switch, series connection access oil nozzle drives loop, is not applied on oil nozzle by the driving pulse of the switch Shi Yuan ECU of factory, supplies with thereby reduce diesel oil.But only reduce diesel injection amount and exist fatal shortcoming: the injection timing (Timing) of not optimizing diesel oil.In the time that diesel engine is mixed burning rock gas, diesel oil not only serves as fuel but also serve as ignition mechanism.And the diesel oil injection timing of former diesel engine is all optimized according to pure diesel fuel mode, double fuel is mixed while burning,, according to operating mode, again optimize injection timing.Therefore only rely on the former ECU of factory cannot optimize dual-fuel diesel injection timing, injection timing is improper, may cause engine knock, and the serious accident of motor occurs to destroy.
Summary of the invention
Rely on the former ECU of factory completely in order to overcome existing bifuel system, defect that cannot ACTIVE CONTROL diesel injection, the invention provides a kind of diesel/natural gas and initiatively mix and burn electronic control system and method, both controlled diesel pilot emitted dose, control again the injection timing of diesel pilot.
The present invention adopts following technological scheme:
A kind of diesel/natural gas is initiatively mixed burning electronic control system, comprise single-chip microcomputer, and the rock gas nozzle intelligent drive circuit being connected with single-chip microcomputer respectively, diesel fuel nozzle drive circuit, pure diesel fuel mode/active are mixed and are burnt mode selector switch, load signal processing circuit and adaptive processing circuit, described load signal processing circuit receives engine load sensor testing signal, and described adaptive processing circuit receives crankshaft position sensor testing signal.
Described single-chip microcomputer adopts the single-chip microcomputer that model is TMS320F28035, the built-in pulse width modulation module of described single-chip microcomputer.
Described load signal processing circuit is specially Butterworth second order filter.
The high terminal voltage of described diesel fuel nozzle intelligent drive circuit adopts single booster power.
Described adaptive processing circuit adopts L9741 interface chip, crankshaft-position signal filtering by differential self balancing eliminator to alternating signal character, changed the comparison door of L9741 by single-chip microcomputer according to engine operation condition, realize the self-adaptive processing to crank position.
Described rock gas nozzle intelligent drive circuit comprises rock gas nozzle, the high-end anode that connects of described rock gas nozzle, the low termination of rock gas nozzle drives field effect transistor VND14NV04 as power drive, by single chip computer measurement flow through earth resistance driving current resistance two ends produce voltage, thereby control the driving current of rock gas nozzle, realize peak value constant current and drive.
A kind of double fuel of diesel/natural gas is initiatively mixed burning electronic control method, comprise that single-chip microcomputer obtains crankshaft-position pulse signal, and calculation engine rotating speed, adopt speed density method to calculate the air-mass flow of cylinder according to engine speed, thereby judge the working state of motor, described working state comprises heavy load, middle load and light load state;
According to motor different conditions, switch pure diesel fuel mode and initiatively mix burning pattern;
In the time selecting pure diesel fuel mode, rock gas nozzle is not worked, and diesel fuel nozzle is controlled by the former ECU of factory completely;
When being chosen as while initiatively mixing burning pattern, the best injection timing arteries and veins spectrogram that single-chip microcomputer is demarcated according to stand test obtains injection timing, corresponding injection timing and fuel injection pulsewidth data are put into the built-in PWM module of single-chip microcomputer, drive diesel fuel nozzle drive circuit, thereby export correct fuel injection pulse and jet pulse.
Beneficial effect of the present invention:
(1) mix burning automatical control system and do not rely on the fuel injection pulse width of measuring the former ECU of factory, determine fuel duty, but by measuring engine load and rotating speed, calculate required fuel quantity according to engine control model.
(2) by mixing the diesel fuel nozzle drive circuit that burns automatical control system oneself; freely control injection timing; the optimum time of ignition control of burning rock gas is mixed in realization; avoid in essence the generation of pinking from burning; protection engine mechanical parts; realize best combustion effect, to obtain best combustion Economy simultaneously.
Brief description of the drawings
Fig. 1 is that burning electrical control system structure schematic diagram is mixed in active of the present invention;
Fig. 2 is adaptive processing circuit schematic diagram of the present invention;
Fig. 3 is rock gas nozzle intelligent drive circuit schematic diagram of the present invention;
Fig. 4 is that burning mode selector switch schematic diagram is mixed in the pure diesel fuel mode/active of the present invention;
Fig. 5 is diesel fuel nozzle intelligent drive circuit schematic diagram;
Fig. 6 is the workflow diagram of single-chip microcomputer.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment
As shown in Figure 1, a kind of double fuel of diesel/natural gas is initiatively mixed burning electronic control system, comprise single-chip microcomputer, and the rock gas nozzle intelligent drive circuit being connected with single-chip microcomputer respectively, diesel fuel nozzle drive circuit, pure diesel fuel mode/active are mixed and are burnt mode selector switch, load signal processing circuit and adaptive processing circuit, described load signal processing circuit receives engine load sensor testing signal, described adaptive processing circuit receives crankshaft position sensor testing signal, and described crankshaft position sensor is measured rotational position and the rotational speed of engine crankshaft.
Described engine load sensor adopts suction pressure/intake temperature integral sensor, and described crankshaft position sensor is electromagnetic sensor.
Described load signal processing circuit is the second order Butterworth LPF being made up of operational amplifier, and suction pressure, the intake air temperature signals to motor adjusted, filtering processing.
As shown in Figure 2, described adaptive processing circuit adopts L9741 interface chip, the differential self balancing eliminator of described adaptive processing circuit placard, crankshaft-position signal filtering by additional differential self balancing eliminator to alternating signal character, changed the comparison door of L9741 by single-chip microcomputer according to engine operation condition, realize the self-adaptive processing to crank position.
Engine crankshaft position sensor adopts electromagnetic sensor.This signal is alternating signal, and its amplitude and frequency change and pass through capacitor C with engine speed
1, C
2common mode disturbances on filtering crankshaft-position signal NE+, NE-, passes through capacitor C
3, C
4, R
1the RC low-pass filter circuit of composition, the string mould High-frequency Interference on filtering crankshaft signal, filtered crankshaft signal is through current-limiting resistance R
2, R
3be connected with comparator with adder respectively, the effect of adder be by single-chip microcomputer by software control comparator negative terminal voltage size, thereby control comparative voltage door, realize the self-adaptive processing of crankshaft signal.Last comparator is exported the DC pulse signal Ne that can be accepted by single-chip microcomputer, and single-chip microcomputer calculates crankshaft rotating position and rotating speed.
As shown in Figure 3, the high-end anode V that connects of the rock gas nozzle of described rock gas nozzle intelligent drive circuit
batt, the low termination of rock gas nozzle drives field effect transistor VND14NV04 drain D, and the source electrode of VND14NV04 is through current measurement resistance R
shuntground connection, for guarantee nozzle is normally opened, R
shuntresistance is very little, R
shuntthe voltage very little (approximately tens millivolts) at two ends, so resistance both end voltage v
+, v
-be connected to respectively differential amplifier v
1, v
2positive input, form balanced differential amplification circuit, signal amplifies after filtering and becomes the receptible voltage signal V of single-chip microcomputer
i, single-chip microcomputer is according to V
isize, controls the break-make of VND14NV04 gate pole, thereby controls blast nozzle driving current, different from the driving current control of pure hardware, and single-chip microcomputer can, according to engine operation condition, be optimized the driving current of nozzle, realizes the intelligent drives of blast nozzle.
As shown in Figure 4, described pure diesel fuel mode/active is mixed and is burnt mode selector switch employing field effect transistor SWh
1, SWh
2as high-end switch, SWl
1, SWl
2as low-end switch, by mix burn automatical control system determine diesel fuel nozzle 1 is controlled by the former ECU of factory or by mixed burn automatical control system mix burning ECU control.
The high-end H of diesel fuel nozzle 1 is connected with the field effect transistor as selector switch respectively with low side L.High-end H passes through SWh
1, SWh
2drive flash H1 with the former ECU of factory nozzle respectively and mix and burn ECU driving flash H2 and be connected.The low side L of diesel fuel nozzle passes through SWl
1, SWl
2respectively with the former ECU of factory nozzle drive low limit L1 with mix burn ECU drive low limit L2 to be connected.When selecting pure diesel fuel mode, SWh
1, SWl
1conducting, SWh
2, SWl
2turn-off; When selecting to mix burning pattern, SWh
1, SWl
1turn-off SWh
2, SWl
2conducting, the injection timing of now diesel injection and fuel injection quantity determine by mixing burning ECU completely, have realized initiatively mixing to burn and controlled.
As shown in Figure 5, the peak value constant current that described diesel fuel nozzle drive circuit adopts high side fet and low side fet to form diesel fuel nozzle drives.High terminal voltage V
boostcell voltage V
battobtain by DC/DC boost conversion.Low limit driving tube is selected the nozzle corresponding with motor acting cylinder, flash driving tube carries out PWM control according to measuring electric current, similar with blast nozzle, diesel fuel nozzle driving current is also by scm software intelligent control, and corresponding optimum Peak current and optimum steady current change with engine operating condition.
As shown in Figure 6, a kind of double fuel of diesel/natural gas is initiatively mixed burning electronic control method, comprise single-chip microcomputer power-up initializing, single-chip microcomputer obtains crankshaft-position pulse signal, and calculation engine rotating speed, adopt speed density method to calculate the air inlet charge of cylinder according to engine speed, thereby judge the working state of motor, described working state comprises heavy load, middle load and light load state;
If light load state, selects pure diesel fuel mode, rock gas nozzle is not worked, and diesel fuel nozzle is controlled by the former ECU of factory completely;
Otherwise select to mix burning pattern, according to engine load and rotating speed determine corresponding the best mix burn ratio, the arteries and veins spectrogram of demarcating according to stand test is determined best injection timing, corresponding injection timing and fuel injection pulsewidth data are put into the built-in PWM module of single-chip microcomputer, drive diesel fuel nozzle drive circuit, thereby export correct fuel injection pulse and jet pulse.
The present invention initiatively mixes and burns automatical control system is relation in parallel with former factory diesel engine electric control system, can not rely on former factory automatical control system, realize the optimal control of burning fuel injection quantity, jet amount and injection timing to mixing, from avoiding in essence, double fuel is passive mixes issuable phenomenon of detonation while burning, ensures the reliability of duel fuel engine long-term work.
Above-described embodiment is preferably mode of execution of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection scope of the present invention.
Claims (7)
1. a diesel/natural gas is initiatively mixed burning electronic control system, it is characterized in that, comprise single-chip microcomputer, and the rock gas nozzle intelligent drive circuit being connected with single-chip microcomputer respectively, diesel fuel nozzle drive circuit, pure diesel fuel mode/active are mixed and are burnt mode selector switch, load signal processing circuit and adaptive processing circuit, described load signal processing circuit receives engine load sensor testing signal, and described adaptive processing circuit receives crankshaft position sensor testing signal.
2. control system according to claim 1, is characterized in that, described single-chip microcomputer adopts the single-chip microcomputer that model is TMS320F28035, the built-in pulse width modulation module of described single-chip microcomputer.
3. control system according to claim 1, is characterized in that, described load signal processing circuit is specially Butterworth second order filter.
4. control system according to claim 1, is characterized in that, the high terminal voltage of described diesel fuel nozzle drive circuit adopts single booster power.
5. control system according to claim 1, is characterized in that, described adaptive processing circuit adopts L9741 interface chip.
6. control system according to claim 1, it is characterized in that, described rock gas nozzle intelligent drive circuit comprises rock gas nozzle, the high-end anode that connects of described rock gas nozzle, and the low termination of rock gas nozzle drives field effect transistor VND14NV04 as power drive.
7. the controlling method of control system described in application rights requirement 1-6 any one, it is characterized in that, comprise that single-chip microcomputer obtains crankshaft-position pulse signal, and calculation engine rotating speed, adopt speed density method to calculate the air-mass flow of cylinder according to engine speed, thereby judge the working state of motor, described working state comprises heavy load, middle load and light load state;
According to motor different conditions, switch pure diesel fuel mode and initiatively mix burning pattern;
In the time selecting pure diesel fuel mode, rock gas nozzle is not worked, and diesel fuel nozzle is controlled by the former ECU of factory completely;
When being chosen as while initiatively mixing burning pattern, the best injection timing arteries and veins spectrogram that single-chip microcomputer is demarcated according to stand test obtains injection timing, corresponding injection timing and fuel injection pulsewidth data are put into the built-in PWM module of single-chip microcomputer, drive diesel fuel nozzle drive circuit, thereby export correct fuel injection pulse and jet pulse.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410218915.XA CN104005863A (en) | 2014-05-22 | 2014-05-22 | Diesel/natural gas active blending combustion electronic control system and method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410218915.XA CN104005863A (en) | 2014-05-22 | 2014-05-22 | Diesel/natural gas active blending combustion electronic control system and method |
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| CN201410218915.XA Pending CN104005863A (en) | 2014-05-22 | 2014-05-22 | Diesel/natural gas active blending combustion electronic control system and method |
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| CN104481711A (en) * | 2014-11-05 | 2015-04-01 | 株洲南车时代电气股份有限公司 | Method for controlling dual-fuel locomotive |
| CN104748148A (en) * | 2015-03-20 | 2015-07-01 | 铜陵有色金属集团股份有限公司 | Diesel oil and natural gas undistributed switching device for converter combustion system and control method thereof |
| CN106194452A (en) * | 2016-07-11 | 2016-12-07 | 清华大学 | A kind of polymethoxy dimethyl ether is used to ignite the method for natural gas and application thereof |
| CN104454205B (en) * | 2014-11-04 | 2017-06-16 | 南岳电控（衡阳）工业技术股份有限公司 | Diesel electric-controlled unit micro controller module |
| CN108194215A (en) * | 2017-12-27 | 2018-06-22 | 成都恩吉威汽车系统有限公司 | GDI engine fuel injector flexibility intervenes control device and control method |
| CN108918800A (en) * | 2018-05-16 | 2018-11-30 | 佛山市云米电器科技有限公司 | Water hardness detector, the hydrotreater, method of adjustment of adjustable filtering parameter |
| CN110107413A (en) * | 2019-07-02 | 2019-08-09 | 潍柴动力股份有限公司 | A kind of calculation method of injection advance angle, device and electronic equipment |
| CN110360015A (en) * | 2019-07-02 | 2019-10-22 | 北京恩吉威科技股份有限公司 | A kind of GDI engine dual-purpose fuel control system |
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| CN104454205B (en) * | 2014-11-04 | 2017-06-16 | 南岳电控（衡阳）工业技术股份有限公司 | Diesel electric-controlled unit micro controller module |
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| CN108194215A (en) * | 2017-12-27 | 2018-06-22 | 成都恩吉威汽车系统有限公司 | GDI engine fuel injector flexibility intervenes control device and control method |
| CN108918800A (en) * | 2018-05-16 | 2018-11-30 | 佛山市云米电器科技有限公司 | Water hardness detector, the hydrotreater, method of adjustment of adjustable filtering parameter |
| CN110107413A (en) * | 2019-07-02 | 2019-08-09 | 潍柴动力股份有限公司 | A kind of calculation method of injection advance angle, device and electronic equipment |
| CN110360015A (en) * | 2019-07-02 | 2019-10-22 | 北京恩吉威科技股份有限公司 | A kind of GDI engine dual-purpose fuel control system |
| CN110360015B (en) * | 2019-07-02 | 2022-05-20 | 成都恩吉威汽车技术有限公司 | Dual-purpose fuel control system of GDI engine |
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Application publication date: 20140827 |