CN102359418B - Method for controlling fuel injection of engine - Google Patents

Method for controlling fuel injection of engine Download PDF

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CN102359418B
CN102359418B CN2011103350573A CN201110335057A CN102359418B CN 102359418 B CN102359418 B CN 102359418B CN 2011103350573 A CN2011103350573 A CN 2011103350573A CN 201110335057 A CN201110335057 A CN 201110335057A CN 102359418 B CN102359418 B CN 102359418B
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pulsewidth
oil spout
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conventional oil
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CN102359418A (en
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邓文谦
常晓燕
刘全刚
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/40Engine management systems

Abstract

The invention discloses a method for controlling fuel injection of an engine. The method comprises the following steps of: calculating an injection pulse width compensation coefficient under the current injection pressure according to a fuel pressure pulsation amplitude value, the current injection pressure of a fuel injector and the nominal pressure of the fuel injector under the current working condition when the rotating speed of the engine is controlled within a hydraulic resonance rotating speed area; multiplying the injection pulse width compensation coefficient with the current conventional fuel injection driving pulse width; correcting the pulse width of a fuel injection driving pulse to acquire the current pressure corrected fuel injection driving pulse width; and controlling to transmit the fuel injection driving pulse with the corrected pulse width to all fuel injectors through an electronic control device, so that the air-fuel ratio of mixed gas is controlled within a reasonable interval at different temperature points when the rotating speed of the engine is controlled within the hydraulic resonance rotating speed area, serious reduction in the air-fuel ratio can be avoided, and the cost and the mounting complexity of a fuel supplying pipeline cannot be increased.

Description

Engine fuel injection control method
Technical field
The present invention relates to engine technology, particularly a kind of engine fuel injection control method.
Background technique
Along with the exhaustion day by day of the energy and the continuous enhancing of environmental protection consciousness, people constantly improve for the requirement of automotive engineering.Use the electronic control system of multi-point injection on motor, because controlling method is flexible, can realize the accurate control of engine air-fuel ratio, become the standard configuration of passenger car at present.
Electronic fuel injection controlling system, take an electric control device (ECU) as control centre, utilization is arranged on the various sensors on the motor different parts, record the various running parameters of motor, according to the control program of setting in ECU, by controlling oil sprayer, control accurately fuel injection quantity, make motor can obtain the mixed gas of optium concentration under various operating modes.
The fuel oil of electronic fuel injection controlling system supplies the oil supply rail by fuel pump by pipeline, and oily rail provides enough spaces to store fuel oil, supplies with oil sprayer.Oil sprayer is accepted the instruction of ECU, the oil spout in the intake manifold of requirement in accordance with regulations.
Air inflow is controlled by accelerator pedal control node valve by the driver, and throttle opening is different, and air inflow is also different, and the degree of vacuum in intake manifold is also different, and under same rotating speed, the degree of vacuum of intake manifold becomes certain proportionate relationship with air inflow.intake manifold pressure sensor can become the change transitions of degree of vacuum in intake manifold the variation of electrical signal, and give ECU, ECU calculates air input of engine by air according to the size of intake manifold vacuum, record calculated signals according to crankshaft position sensor again and go out engine speed, calculate corresponding basic fuel injection amount according to air inflow and tachometer, ECU is according to suction pressure and each cylinder injector of control of engine speed motor, control fuel injection quantity by the endurance of controlling each oil spout, injection duration is longer, fuel injection quantity is larger, the moment of the each oil spout of each cylinder is recorded a certain position signal and controls according to being installed on engine speed (crank position) sensor on clutch housing by ECU.
but, there is the hydraulic pressure resonance phenomena in the oil rail under specified temp, the Pulsating wave amplitude that shows as in oily rail significantly increases, as shown in Figure 1, when ECU control to send the oil spout driving pulse to each cylinder injector (during each cylinder injector oil spout) be in the trough of pressure wave, when oily rail Pulsating wave amplitude is larger, each cylinder injector jet pressure significantly reduces, common engine management system, only the variation for air-distributor pressure compensates fuel injection quantity, do not consider when the oil sprayer jet pressure significantly changes, fuel injection quantity to be compensated, so each cylinder injector actual fuel injection amount is far below calculating fuel injection quantity, can cause air fuel ratio seriously partially rare, the engine combustion variation, cause rotation speed change violent, the idling shake, abnormal misfire, catch fire etc.For this problem, existing technical solution is mainly the Pulsating wave amplitude of managing to reduce in oily rail, and is wherein a kind of by adding buffer (damper) in oily rail inside, suppresses hydro pulse; Another kind is the peripheral pipeline of oily rail to be replaced to the Energy suppression pulsation of the softer rubber hose reduction reflected wave of material, but the defective of first method can increase the cost of oil feed line, second method has increased again the installation complexity of car load production line oil feed line when the oil feed line cost slightly increases.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of engine fuel injection control method, when making engine speed in hydraulic pressure resonance rotary speed area, mixed air air fuel ratio under different temperature points is controlled at a rational interval, can not cause air fuel ratio seriously partially rare, and can not increase the cost of oil feed line and complexity is installed.
For solving the problems of the technologies described above, engine fuel injection control method of the present invention comprises the following steps:
One. when engine speed is in hydraulic pressure resonance rotary speed area, current conventional oil spout is driven pulsewidth carry out pressure correction, obtain current pressure correction oil spout and drive pulsewidth, the method that current conventional oil spout driving pulsewidth is carried out pressure correction is:
te=ti_w*fr_w_ua,
fr _ w _ ua = ( 1 - pdr akt P nor ) + 1 ,
Wherein, te is that current pressure correction oil spout drives pulsewidth, and ti_w is that current conventional oil spout drives pulsewidth, and fr_w_ua is the injection pulse width penalty coefficient under current jet pressure, pdr aktBe the current jet pressure of oil sprayer, P norBe oil sprayer name nominal pressure;
Two. electric control device is controlled and sent pulsewidth is that current pressure correction oil spout drives the oil spout driving pulse of pulsewidth to oil sprayer.
The current jet pressure pdr of oil sprayer aktCan be calculated by following formula: pdr akt=P nor-S/T,
Wherein, S is the pulsation amplitude under current working, and T is current working jet pressure correction factor.
Jet pressure correction factor table can be set in storage, described jet pressure correction factor table, be used for demarcating the jet pressure correction factor under each temperature spots, jet pressure correction factor table comprises temperature, jet pressure correction factor data item, and every-temperature is corresponding to a jet pressure correction factor;
Find current working jet pressure correction factor T under Current Temperatures point by jet pressure correction factor table.
Reference temperature microseismic data table, hydraulic pressure resonance rotating speed central point data sheet, amplitude power gain table, periodic coefficient table, pulsation amplitude correction coefficient table can be set in storage;
Described reference temperature microseismic data table, be used for to demarcate the reference temperature microseismic data of engine speed in hydraulic pressure resonance rotary speed area the time, reference temperature microseismic data table comprises that conventional oil spout drives pulsewidth, engine speed, first-harmonic pulsation amplitude data item, same conventional oil spout drives under pulsewidth, the corresponding first-harmonic pulsation amplitude of each engine speed;
Described hydraulic pressure resonance rotating speed central point data sheet, be used for demarcating the hydraulic pressure resonance rotating speed central point data under various conventional oil spout driving pulsewidth and different temperature points, hydraulic pressure resonance rotating speed central point data sheet comprises that conventional oil spout drives pulsewidth, temperature, hydraulic pressure resonance rotating speed central point data item, same conventional oil spout drives under pulsewidth, the corresponding hydraulic pressure resonance rotating speed central point of each temperature;
Described amplitude power gain table, be used for demarcating the amplitude power gain under various conventional oil spout driving pulsewidth and temperature spots, amplitude power gain table comprises that conventional oil spout drives pulsewidth, temperature, amplitude power gain data item, same conventional oil spout drives under pulsewidth, the corresponding amplitude power gain of each temperature, the corresponding amplitude power gain of reference temperature is 1;
Described periodic coefficient table, be used for demarcating the various conventional oil spout and drive periodic coefficient under pulsewidth and temperature spots, the periodic coefficient table comprises that conventional oil spout drives pulsewidth, temperature, periodic coefficient data item, same conventional oil spout drives under pulsewidth, the corresponding periodic coefficient of each temperature, the corresponding periodic coefficient of reference temperature is 1;
Described pulsation amplitude correction coefficient table is used for demarcating pulsation amplitude correction coefficient, comprises temperature, correction factor data item, the corresponding correction factor of each temperature, and the corresponding correction factor of reference temperature is 1;
Pulsation amplitude S under current working obtains by the following method:
Drive pulsewidth and Current Temperatures according to current conventional oil spout, find current conventional oil spout by hydraulic pressure resonance rotating speed central point data sheet and drive under pulsewidth, the hydraulic pressure resonance rotating speed central point n under Current Temperatures point cAnd the hydraulic pressure resonance rotating speed central point n under reference temperature 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by the periodic coefficient table, check in current conventional oil spout and drive under pulsewidth, the periodic coefficient L under Current Temperatures point;
According to following formula, obtain the conversion value x of present engine rotating speed x ':
x=(x′-n c)*L+n 0
Drive the conversion value x of pulsewidth and present engine rotating speed x ' according to current conventional oil spout, find current conventional oil spout by reference temperature microseismic data table and drive under pulsewidth, the corresponding first-harmonic pulsation of the conversion value x of present engine rotating speed x ' amplitude S 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by amplitude power gain table, check in current conventional oil spout and drive under pulsewidth, the amplitude power gain A under Current Temperatures point;
According to Current Temperatures, by described pulsation amplitude correction coefficient table, check in the pulsation amplitude correction coefficient B under Current Temperatures;
According to following formula, obtain the pulsation amplitude S under current working:
S=B*A*S 0
engine fuel injection control method of the present invention, during based on hydraulic pressure resonance, the reduction of jet pressure is the basic reason that causes mixed air partially rare, engine speed is in hydraulic pressure resonance rotary speed area the time, according to current working (current intake temperature, current conventional oil spout drives pulsewidth, the present engine rotating speed) the hydro pulse amplitude under, the current jet pressure of oil sprayer and oil sprayer name nominal pressure, calculate the injection pulse width penalty coefficient under current jet pressure, the injection pulse width penalty coefficient being taken current conventional oil spout drives on pulsewidth again, pulsewidth to the oil spout driving pulse is revised, obtain current pressure correction oil spout and drive pulsewidth, electric control device (ECU) is controlled and is sent through the revised oil spout driving pulse of pulsewidth to each cylinder injector, when making engine speed in hydraulic pressure resonance rotary speed area, mixed air air fuel ratio under different temperature points is controlled at a rational interval, can not cause air fuel ratio seriously partially rare, can not exist the hydraulic pressure resonance phenomena to cause the engine combustion variation under specified temp because of oily rail, cause rotation speed change violent, the idling shake, abnormal misfire, catch fire etc.Engine fuel injection control method of the present invention can not increase the cost of oil feed line and complexity is installed.
Description of drawings
Fig. 1 is the schematic diagram that concerns between hydro pulse and actual fuel oil spray;
Fig. 2 is the Changing Pattern figure of amplitude with engine speed of pulsing at actual measurement various inlet temperature;
Fig. 3 is that first-harmonic arrives actual measurement wave phase conversion schematic diagram;
Fig. 4 is that first-harmonic arrives actual measurement wave amplitude conversion schematic diagram;
Fig. 5 is that first-harmonic arrives actual measurement conversion period of wave schematic diagram;
Fig. 6 surveys the comparison diagram of pulsation amplitude waveform and conversion waveform under fixed pulse width;
Fig. 7 is engine fuel injection control method one embodiment's schematic diagram of the present invention.
Embodiment
Find by test, under a certain fixedly injection pulse width, in hydraulic pressure resonance rotary speed area, the pulsation amplitude waveform that changes with engine speed changes with the variation of intake temperature, as shown in Figure 2, can find out, reduction gradually along with intake temperature (tans), hydraulic pressure resonance rotating speed central point raises gradually, the pulsation amplitude of this hydraulic pressure resonance rotating speed central point increases gradually, pulsation amplitude waveform also narrows gradually, and only there is the difference in phase place, amplitude and cycle in the pulsation amplitude waveform of different temperature points between each waveform; Therefore, can select pulsation amplitude waveform under an intake temperature point (as the highest intake temperature point) as first-harmonic, first-harmonic is carried out the conversion in phase place, amplitude, cycle, obtain the conversion ripple identical with the measured waveform of other temperature spots, so corresponding phase place, amplitude, periodic coefficient can be deposited in the corresponding storage of ECU, obtain the pulsation amplitude of corresponding operating mode by simple computation of table lookup.
The below take intake temperature as the pulsation amplitude waveform of 6 degrees centigrade as first-harmonic, illustrate the conversion of first-harmonic being carried out phase place, amplitude, cycle, obtain and intake temperature is the transform method of the identical conversion ripple of the measured waveform of-17 degrees centigrade, being divided into was three steps, as Fig. 3 to shown in Figure 5:
(1) as shown in Figure 3, carry out intake temperature and be the phase transformation of the actual measurement ripple of-17 degrees centigrade, (x, y) is transformed to (x 1, y 1):
x 1 = x + q y 1 = y
Wherein, q is that two temperatures point pulsation amplitude waveform phase is poor, q=n -17deg-n 6degn -17degBe the hydraulic pressure resonance rotating speed central point under-17 degrees centigrade; n 6degBe 6 degrees centigrade of hydraulic pressure resonance rotating speed central points under (first-harmonic);
(2) as shown in Figure 4, carry out intake temperature and be the amplitude transformation of the actual measurement ripple of-17 degrees centigrade, (x, y) is transformed to (x 2, y 2):
x 2 = x + q = x + n - 17 deg - n 6 deg y 2 = Ay
Wherein, A is that-17 degrees centigrade of actual measurement ripples are with respect to the power gain of first-harmonic;
(3) as shown in Figure 5, carry out intake temperature and be actual measurement conversion wave period of-17 degrees centigrade, (x, y) is transformed to (x ', y '):
x ′ = ( x 2 - n - 17 deg ) / L + n - 17 deg = ( x - n 6 deg ) / L + n - 17 deg y ′ = Ay
Wherein, L is periodic coefficient.
By above three step conversion, the first-harmonic under 6 degrees centigrade of intake temperature just be transformed into and-17 degrees centigrade surveyed the identical conversion ripple of ripple.Fig. 6 is the pulsation amplitude transformation ripple that obtains by above-mentioned transform method and the comparison diagram of surveying ripple, and solid line represents to survey ripple, and dotted line represents the conversion ripple, and as seen both are ideal in the fitting effect of hydraulic pressure resonance rotary speed area.
Below in conjunction with accompanying drawing, the technological scheme in the application is carried out clear, complete description, obviously, described embodiment is a part of embodiment of the application, rather than whole embodiments.Based on the embodiment in the application, all other embodiments that those of ordinary skills obtain under the prerequisite of not making creative work belong to the scope that the application protects.
The first embodiment
As shown in Figure 7, engine fuel injection control method comprises the following steps:
One. when engine speed is in hydraulic pressure resonance rotary speed area, current conventional oil spout is driven pulsewidth carry out pressure correction, obtain current pressure correction oil spout and drive pulsewidth, the method that current conventional oil spout driving pulsewidth is carried out pressure correction is:
te=ti_w*fr_w_ua,
fr _ w _ ua = ( 1 - pdr akt P nor ) + 1 ,
Wherein, te is that current pressure correction oil spout drives pulsewidth, and ti_w is that current conventional oil spout drives pulsewidth, and fr_w_ua is the injection pulse width penalty coefficient under current jet pressure, pdr aktBe the current jet pressure of oil sprayer, P norBe oil sprayer name nominal pressure;
Two. electric control device is controlled and sent pulsewidth is that current pressure correction oil spout drives the oil spout driving pulse of pulsewidth to oil sprayer.
The second embodiment
When engine speed is in hydraulic pressure resonance rotary speed area, the current jet pressure pdr of oil sprayer aktFor:
pdr akt=P nor-S/T,
Wherein, S is the pulsation amplitude (pulsation peak-to-valley value) under current working, and T is current working jet pressure correction factor.
The 3rd embodiment
Pulsation amplitude (pulsation peak-to-valley value) S, current working jet pressure correction factor T under the current working of engine speed in hydraulic pressure resonance rotary speed area the time can obtain by the following method:
Jet pressure correction factor table is set in storage, described jet pressure correction factor table, be used for demarcating the jet pressure correction factor under each temperature spots, jet pressure correction factor table comprises temperature, jet pressure correction factor data item, and each temperature is corresponding to a jet pressure correction factor;
Find current working jet pressure correction factor T under Current Temperatures point by jet pressure correction factor table.
Reference temperature microseismic data table HYPULSTDWA, hydraulic pressure resonance rotating speed central point data sheet HYPULNMOT, amplitude power gain table HYPULAMP, periodic coefficient table KHYPUPED, pulsation amplitude correction coefficient table FPULOFFSET are set in storage;
Described reference temperature microseismic data table HYPULSTDWA, be used for to demarcate the reference temperature microseismic data of engine speed in hydraulic pressure resonance rotary speed area the time, reference temperature microseismic data table comprises that conventional oil spout drives the data item such as pulsewidth, engine speed, first-harmonic hydraulic pressure resonance rotating speed central point, first-harmonic pulsation amplitude, same conventional oil spout drives under pulsewidth, the corresponding first-harmonic pulsation amplitude of each engine speed;
Described hydraulic pressure resonance rotating speed central point data sheet HYPULNMOT, be used for demarcating the hydraulic pressure resonance rotating speed central point data under various conventional oil spout driving pulsewidth and different temperature points, hydraulic pressure resonance rotating speed central point data sheet comprises that conventional oil spout drives the data item such as pulsewidth, temperature, hydraulic pressure resonance rotating speed central point, same conventional oil spout drives under pulsewidth, the corresponding hydraulic pressure resonance rotating speed central point of each temperature;
Described amplitude power gain table HYPULAMP, be used for demarcating the amplitude power gain under various conventional oil spout driving pulsewidth and temperature spots, amplitude power gain table comprises that conventional oil spout drives the data item such as pulsewidth, temperature, amplitude power gain, same conventional oil spout drives under pulsewidth, the corresponding amplitude power gain of each temperature, the corresponding amplitude power gain of reference temperature is 1;
Described periodic coefficient table KHYPUPED, be used for demarcating the various conventional oil spout and drive periodic coefficient under pulsewidth and temperature spots, the periodic coefficient table comprises that conventional oil spout drives the data item such as pulsewidth, temperature, periodic coefficient, same conventional oil spout drives under pulsewidth, the corresponding periodic coefficient of each temperature, the corresponding periodic coefficient of reference temperature is 1;
Described pulsation amplitude correction coefficient table FPULOFFSET is used for demarcating pulsation amplitude correction coefficient, comprises the data item such as temperature, correction factor, the corresponding correction factor of each temperature, and the corresponding correction factor of reference temperature is 1;
Pulsation amplitude (pulsation peak-to-valley value) S under the current working of engine speed in hydraulic pressure resonance rotary speed area the time obtains by the following method:
Drive pulsewidth and Current Temperatures according to current conventional oil spout, find current conventional oil spout by hydraulic pressure resonance rotating speed central point data sheet HYPULNMOT and drive under pulsewidth, the hydraulic pressure resonance rotating speed central point n under Current Temperatures point cAnd the hydraulic pressure resonance rotating speed central point n under reference temperature 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by periodic coefficient table KHYPUPED, check in current conventional oil spout and drive under pulsewidth, the periodic coefficient L under Current Temperatures point;
According to following formula, obtain the conversion value x of present engine rotating speed x ':
x=(x′-n c)*L+n 0
Drive the conversion value x of pulsewidth and present engine rotating speed x ' according to current conventional oil spout, find current conventional oil spout by reference temperature microseismic data table HYPULSTDWA and drive under pulsewidth, the corresponding first-harmonic pulsation of the conversion value x of present engine rotating speed x ' amplitude S 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by amplitude power gain table HYPULAMP, check in current conventional oil spout and drive under pulsewidth, the amplitude power gain A under Current Temperatures point;
According to Current Temperatures, by described pulsation amplitude correction coefficient table FPULOFFSET, check in the pulsation amplitude correction coefficient B under Current Temperatures, because actual injection pressure is not positioned at the hydro pulse the lowest point, therefore need to revise the pulsation amplitude;
According to following formula, obtain the pulsation amplitude S under current working:
S=B*S′=B*A*S 0
engine fuel injection control method of the present invention, during based on hydraulic pressure resonance, the reduction of jet pressure is the basic reason that causes mixed air partially rare, engine speed is in hydraulic pressure resonance rotary speed area the time, according to current working (current intake temperature, current conventional oil spout drives pulsewidth, the present engine rotating speed) the hydro pulse amplitude under, the current jet pressure of oil sprayer and oil sprayer name nominal pressure, calculate the injection pulse width penalty coefficient under current jet pressure, the injection pulse width penalty coefficient being taken current conventional oil spout drives on pulsewidth again, pulsewidth to the oil spout driving pulse is revised, obtain current pressure correction oil spout and drive pulsewidth, electric control device (ECU) is controlled and is sent through the revised oil spout driving pulse of pulsewidth to each cylinder injector, when making engine speed in hydraulic pressure resonance rotary speed area, mixed air air fuel ratio under different temperature points is controlled at a rational interval, can not cause air fuel ratio seriously partially rare, can not exist the hydraulic pressure resonance phenomena to cause the engine combustion variation under specified temp because of oily rail, cause rotation speed change violent, the idling shake, abnormal misfire, catch fire etc.Engine fuel injection control method of the present invention can not increase the cost of oil feed line and complexity is installed.
engine fuel injection control method of the present invention arranges reference temperature microseismic data table, hydraulic pressure resonance rotating speed central point data sheet, amplitude power gain table, periodic coefficient table, pulsation amplitude correction coefficient table in storage, demarcate respectively the reference temperature microseismic data of engine speed in hydraulic pressure resonance rotary speed area the time, the various conventional oil spout drives the hydraulic pressure resonance rotating speed central point data under pulsewidth and different temperature points, the various conventional oil spout drives the amplitude power gain under pulsewidth and temperature spots, the various conventional oil spout drives periodic coefficient under pulsewidth and temperature spots, pulsation amplitude correction coefficient, electric control device (ECU) is according to current intake temperature (tans), current conventional oil spout drives pulsewidth injection pulse width (ti_w), present engine rotating speed (nmot_w) looks into by certain logic the pulsation amplitude that corresponding table calculates current working, this calculation method not only realizes simply, and saved the data space of electric control device (ECU) and improved the computational speed of ECU.

Claims (4)

1. an engine fuel injection control method, is characterized in that, comprises the following steps:
One. when engine speed is in hydraulic pressure resonance rotary speed area, current conventional oil spout is driven pulsewidth carry out pressure correction, obtain current pressure correction oil spout and drive pulsewidth, the method that current conventional oil spout driving pulsewidth is carried out pressure correction is:
te=ti_w*fr_w_ua,
fr _ w _ ua = ( 1 - pd r akt P nor ) + 1 ,
Wherein, te is that current pressure correction oil spout drives pulsewidth, and ti_w is that current conventional oil spout drives pulsewidth, and fr_w_ua is the injection pulse width penalty coefficient under current jet pressure, pdr aktBe the current jet pressure of oil sprayer, P norBe oil sprayer name nominal pressure;
Two. electric control device is controlled and sent pulsewidth is that current pressure correction oil spout drives the oil spout driving pulse of pulsewidth to oil sprayer.
2. engine fuel injection control method according to claim 1, is characterized in that,
pdr akt=P nor-S/T,
Wherein, S is the pulsation amplitude under current working, and T is current working jet pressure correction factor.
3. engine fuel injection control method according to claim 1, is characterized in that,
Jet pressure correction factor table is set in storage, described jet pressure correction factor table, be used for demarcating the jet pressure correction factor under each temperature spots, jet pressure correction factor table comprises temperature, jet pressure correction factor data item, and each temperature is corresponding to a jet pressure correction factor;
Find current working jet pressure correction factor T under Current Temperatures point by jet pressure correction factor table.
4. engine fuel injection control method according to claim 1, is characterized in that,
Reference temperature microseismic data table, hydraulic pressure resonance rotating speed central point data sheet, amplitude power gain table, periodic coefficient table, pulsation amplitude correction coefficient table are set in storage;
Described reference temperature microseismic data table, be used for to demarcate the reference temperature microseismic data of engine speed in hydraulic pressure resonance rotary speed area the time, reference temperature microseismic data table comprises that conventional oil spout drives pulsewidth, engine speed, first-harmonic pulsation amplitude data item, same conventional oil spout drives under pulsewidth, the corresponding first-harmonic pulsation amplitude of each engine speed;
Described hydraulic pressure resonance rotating speed central point data sheet, be used for demarcating the hydraulic pressure resonance rotating speed central point data under various conventional oil spout driving pulsewidth and different temperature points, hydraulic pressure resonance rotating speed central point data sheet comprises that conventional oil spout drives pulsewidth, temperature, hydraulic pressure resonance rotating speed central point data item, same conventional oil spout drives under pulsewidth, the corresponding hydraulic pressure resonance rotating speed central point of each temperature;
Described amplitude power gain table, be used for demarcating the amplitude power gain under various conventional oil spout driving pulsewidth and temperature spots, amplitude power gain table comprises that conventional oil spout drives pulsewidth, temperature, amplitude power gain data item, same conventional oil spout drives under pulsewidth, the corresponding amplitude power gain of each temperature, the corresponding amplitude power gain of reference temperature is 1;
Described periodic coefficient table, be used for demarcating the various conventional oil spout and drive periodic coefficient under pulsewidth and temperature spots, the periodic coefficient table comprises that conventional oil spout drives pulsewidth, temperature, periodic coefficient data item, same conventional oil spout drives under pulsewidth, the corresponding periodic coefficient of each temperature, the corresponding periodic coefficient of reference temperature is 1;
Described pulsation amplitude correction coefficient table is used for demarcating pulsation amplitude correction coefficient, comprises temperature, correction factor data item, the corresponding correction factor of each temperature, and the corresponding correction factor of reference temperature is 1;
Pulsation amplitude S under current working obtains by the following method:
Drive pulsewidth and Current Temperatures according to current conventional oil spout, find current conventional oil spout by hydraulic pressure resonance rotating speed central point data sheet and drive under pulsewidth, the hydraulic pressure resonance rotating speed central point n under Current Temperatures point cAnd the hydraulic pressure resonance rotating speed central point n under reference temperature 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by the periodic coefficient table, check in current conventional oil spout and drive under pulsewidth, the periodic coefficient L under Current Temperatures point;
According to following formula, obtain the conversion value x of present engine rotating speed x':
x=(x'-n c)*L+n 0
Drive the conversion value x of pulsewidth and present engine rotating speed x' according to current conventional oil spout, find current conventional oil spout by reference temperature microseismic data table and drive under pulsewidth, the corresponding first-harmonic pulsation of the conversion value x of present engine rotating speed x' amplitude S 0
Drive pulsewidth and Current Temperatures according to current conventional oil spout, by amplitude power gain table, check in current conventional oil spout and drive under pulsewidth, the amplitude power gain A under Current Temperatures point;
According to Current Temperatures, by described pulsation amplitude correction coefficient table, check in the pulsation amplitude correction coefficient B under Current Temperatures;
According to following formula, obtain the pulsation amplitude S under current working:
S=B*A*S 0
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