CN103233825A - Secondary adjustable boosting control system and control method thereof - Google Patents

Secondary adjustable boosting control system and control method thereof Download PDF

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CN103233825A
CN103233825A CN2013101176463A CN201310117646A CN103233825A CN 103233825 A CN103233825 A CN 103233825A CN 2013101176463 A CN2013101176463 A CN 2013101176463A CN 201310117646 A CN201310117646 A CN 201310117646A CN 103233825 A CN103233825 A CN 103233825A
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modulating valve
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low pressure
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CN103233825B (en
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刘瑞林
董素荣
孟军
张众杰
周广猛
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Military Transportation University of PLA
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/12—Improving ICE efficiencies

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Abstract

The invention discloses a secondary adjustable boosting control system. The secondary adjustable boosting control system comprises a high-pressure booster with a variable-section spray nozzle, and a low-pressure booster, which are connected in series, wherein the low-pressure booster comprises a low-pressure air compressor and a low-pressure turbine; a low-pressure intake by-pass valve and a low-pressure exhaust regulating valve are respectively arranged on by-pass pipelines of the low-pressure air compressor and the high-pressure turbine; the high-pressure booster comprises a high-pressure air compressor and a high-pressure turbine; and the high-pressure turbine is equipped with the variable-section nozzle and a high-pressure exhaust regulating valve is arranged on a by-pass pipeline connected in parallel with the high-pressure turbine. The invention further discloses a control method of the control system, and can realize supercharge pressure adjustment of a diesel engine at different altitudes and under different working conditions through controlling the opening and closing, as well as the opening degree, of all valves and utilizing the MAP value to achieve adjustment in a negative feedback mode so as to achieve the goal that the power of the engine at the altitude of 5,500 calibration point restores to 90 percent of the calibration point under the plain condition.

Description

The adjustable supercharge control system of secondary and controlling method thereof
Technical field
The present invention relates to technical field of engines, particularly relate to the adjustable supercharge control system of a kind of secondary and controlling method thereof.
Background technique
Along with the rising of height above sea level, atmospheric pressure decreases, and engine power descends thereupon.In order to make motor recover the target that power reaches Plain power 90% in the 5500m altitude, the pressure ratio of gas compressor reaches more than 4.8 to the calibration point interval at least at maximum torque point.If adopt the single stage supercharging scheme, can reach so high pressure ratio and range of flow requirement without any a gas compressor in the world at present, therefore need to adopt the adjustable supercharging of secondary.
Yet at present the two-stage supercharging control system is mostly at fixing each operating mode of height above sea level, and is bigger at different regions height above sea level gap, be chosen as the motor of plains region when two-stage supercharging design match point, when having arrived the plateau section operation, air density descends rapidly, and engine power also can correspondingly descend.Be chosen as the plateau section motor when two-stage supercharging designs match point, when having arrived the plains region operation, the emission performance of low engine speed section is difficult to again guarantee.
Summary of the invention
Technological deficiency at the existence of existing two-stage supercharging system, the adjustable supercharge control system of secondary provided by the invention can be regulated the aperture of each valve of pressurized machine and variable-area nozzle according to the variation of height above sea level and engine operating condition, recovers Plain condition calibration point 90% target to reach motor at height above sea level 5500m calibration point power.
For realizing that the technological scheme that purpose of the present invention adopts is:
The adjustable supercharge control system of a kind of secondary, the variable-nozzle cross section high pressure stage pressurized machine and the low pressure stage pressurized machine that comprise series connection, described low pressure stage pressurized machine comprises low pressure stage gas compressor and low pressure stage turbo machine, is respectively arranged with low-pressure admission bypass valve and low pressure exhaust modulating valve at the bypass line of described low pressure stage gas compressor and low pressure stage turbo machine; Described high pressure stage pressurized machine comprises high pressure stage gas compressor and high-pressure turbine stage, described high-pressure turbine stage disposes variable-area nozzle and the bypass line in parallel with high-pressure turbine stage is provided with the high pressure exhaust gas modulating valve, pipeline between low pressure stage gas compressor and the high pressure stage gas compressor is provided with first pressure transducer, suction port place at motor is provided with second pressure transducer, but the variable-area nozzle of described high-pressure turbine stage, high pressure exhaust gas modulating valve and low pressure exhaust modulating valve step-less adjustment and all be connected with ECU (Electrical Control Unit) is controlled.
Described high pressure exhaust gas modulating valve is built-in modulating valve.
Described low-pressure admission bypass valve has only standard-sized sheet and complete shut-down two states.
Controlling method as the adjustable supercharge control system of each described secondary of claim 1-3 may further comprise the steps,
1) behind the engine start, ECU at first reads current environment pressure, if greater than Kpa, and then standard-sized sheet external low-pressure admission bypass valve and low pressure exhaust modulating valve, if less than Kpa, external low-pressure admission bypass valve full cut-off then;
2) ECU reads current engine speed and throttle position and carrying capacity, temperature etc. and obtains one-level boost pressure desired value and two-stage supercharging pressure target value under the current state by demarcating MAP figure, if the force value of current relatively first pressure sensor senses of one-level boost pressure desired value raises, then judge whether standard-sized sheet of low pressure exhaust modulating valve, if there is not standard-sized sheet then to increase the aperture of low pressure exhaust modulating valve, if the low pressure exhaust modulating valve standard-sized sheet then finish; If the force value of current relatively first pressure sensor senses of one-level boost pressure desired value reduces, then judge whether complete shut-down of low pressure exhaust modulating valve, if there is not complete shut-down then to reduce the low pressure exhaust control valve opening, if the low pressure exhaust modulating valve complete shut-down then finish; If changing, the force value of current relatively first pressure sensor senses of one-level boost pressure desired value then do not adjust;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value raises, then judge whether standard-sized sheet of variable-area nozzle, if do not have standard-sized sheet then to increase the variable-area nozzle aperture, if standard-sized sheet is then judged whether standard-sized sheet of high pressure exhaust gas modulating valve, if the high pressure exhaust gas modulating valve do not have standard-sized sheet then to increase the high pressure exhaust gas control valve opening, if the high pressure exhaust gas modulating valve already standard-sized sheet then finish;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value reduces, then judge whether full cut-off of high pressure exhaust gas modulating valve, if there is not full cut-off then to turn down the high pressure exhaust gas control valve opening, if the high pressure exhaust gas modulating valve cuts out already and judges then whether variable-area nozzle closes, finish if closed then, then do not reduce the variable-area nozzle aperture if close;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value do not have variation then not adjust.
Compared with prior art, the invention has the beneficial effects as follows:
The aperture of the variable-area nozzle of high-pressure turbine stage of the present invention, high pressure exhaust gas modulating valve and low pressure exhaust modulating valve is controlled by ECU (Electrical Control Unit) (ECU).When motor is worked in the Plain, only need the high pressure stage turbocharger operation just can satisfy the job requirement of diesel engine, this moment, the low pressure stage pressurized machine need not operation, and low-pressure admission bypass valve 13 and low pressure exhaust modulating valve 16 are opened simultaneously.When motor is worked in the plateau section, high pressure stage pressurized machine and low pressure stage pressurized machine are worked simultaneously, regulate by the reverse feedback pattern by the MAP value of demarcating, can realize the adjusting of diesel engine supercharging pressure under Different Altitude, the different operating mode, recover Plain condition calibration point 90% target to reach motor at height above sea level 5500m calibration point power.
Description of drawings
Figure 1 shows that the adjustable supercharge control system structural representation of secondary of the present invention;
Figure 2 shows that control flow schematic representation of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explaining the present invention, and be not used in restriction the present invention.
As shown in Figure 1, the adjustable supercharge control system of the secondary of diesel engine 1 of the present invention is made of variable-nozzle cross section high pressure stage pressurized machine and the series connection of low pressure stage pressurized machine, described low pressure stage pressurized machine comprises low pressure stage gas compressor 14 and low pressure stage turbo machine 15, is respectively arranged with external low-pressure admission bypass valve 13 and external low pressure exhaust modulating valve 16 at the bypass line of described low pressure stage gas compressor 14 and low pressure stage turbo machine 15.Described high pressure stage pressurized machine comprises high pressure stage gas compressor 9 and high-pressure turbine stage 10, described high-pressure turbine stage 10 disposes variable-area nozzle (being designated as VGT) 8 and the bypass line in parallel with high-pressure turbine stage 10 is provided with built-in type high pressure waste gas regulating valve (being designated as the RV II) 7, series connection intercooler 12 between low pressure stage and the high pressure stage gas compressor, also be provided with second intercooler 6 at the suction port place of motor, so just make whole compression close to isothermal compression, thereby the little energy that consumes of gas compressor, improve the efficient of turbosupercharger.The low-pressure admission bypass valve of low pressure stage gas compressor 14 (being designated as the BV I) 13 has only standard-sized sheet and complete shut-down two states; The variable-area nozzle 8 of high-pressure turbine stage, high pressure exhaust gas modulating valve 7 and low pressure exhaust modulating valve (being designated as the RV I) but 16 step-less adjustment control by ECU (Electrical Control Unit) (ECU).Pipeline between low pressure stage gas compressor 14 and the high pressure stage gas compressor 9 is provided with first pressure transducer 11, be provided with second pressure transducer 5 and intake air temperature sensor 4 at the suction port place of motor, but also comprise the ambient pressure sensor of sensitive context pressure simultaneously.Motor also comprises sensors such as throttle position switch 2 and engine rotation speed sensor 3 simultaneously.
At first it should be explicitly made clear at this point, the present invention is based on Engine ECU realizes, ECU(Electronic Control Unit, electronic control unit) claims " car running computer ", " vehicle-mounted computer " etc. again, according to its built-in program and data the information of inputs such as various sensors such as Air flow meter and throttle position, engine speed is carried out computing, processing, judgement, then according to the control strategy output instruction signal.
Specifically, surely the one 2 dimension characteristic MAP figure that the carrying capacity (Engine_Duty) that obtains engine speed and throttle position correspondence for the advanced rower of motor important affair is relevant, and obtain the 22 dimension characteristic MAP figure of initial suction pressure desired value according to engine speed and engine load amount, namely, all can obtain initial target suction pressure calibration value by inquiring about two 2 dimension characteristic MAP figure under throttle position and the rotating speed arbitrarily, namely comprise initial one-level boost pressure calibration value and initial two-stage supercharging pressure calibration value, the place of Different Altitude and latitude, external pressure and variation of ambient temperature can have influence on the air quantity of air inlet cylinder, because also have two-stage supercharging after the one-level supercharging, so only two-stage supercharging is revised among the present invention, specifically, therefore the pressure and temperature of gathering external pressure and intake manifold carries out corrected Calculation to the air quantity that enters cylinder, to namely obtain two-stage supercharging pressure target value after the initial two-stage supercharging pressure calibration value revision, wherein, one-level boost pressure desired value (being one-level boost pressure calibration value) and two-stage supercharging pressure target value are namely as the basis of following steps judgement.
The controlling method of the adjustable supercharge control system of secondary of the present invention is specific as follows:
Behind the engine start, ECU at first reads current environment pressure, if greater than 80Kpa, then standard-sized sheet low-pressure admission bypass valve 13 and low pressure exhaust modulating valve 16 are not worked the low pressure stage pressurized machine, only high pressure stage pressurized machine work, if less than 80Kpa, low-pressure admission bypass valve 13 full cut-offs.Namely do not work only high-voltage booster work at the following low-pressure turbocharger of height above sea level 2000m.ECU reads current engine speed and carrying capacity, ambient temperature etc., obtain current state next stage boost pressure desired value and two-stage supercharging pressure target value by MAP figure and revision, if the relative one-level boost pressure of the force value desired value of first pressure sensor senses raises, then judge whether standard-sized sheet of low pressure exhaust modulating valve 16, if there is not standard-sized sheet then to increase the aperture of low pressure exhaust modulating valve 16, if low pressure exhaust modulating valve 16 standard-sized sheet then finish; If the relative one-level boost pressure of the force value desired value of sensor sensing reduces, then judge whether complete shut-down of low pressure exhaust modulating valve 16, if there is not complete shut-down then to reduce low pressure exhaust modulating valve 16 apertures, if low pressure exhaust modulating valve 16 complete shut-down then finish.
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value raises, then judge whether standard-sized sheet of variable-area nozzle 8, if do not have standard-sized sheet then to increase variable-area nozzle 8 apertures, if standard-sized sheet is then judged whether standard-sized sheet of high pressure exhaust gas modulating valve 7, if high pressure exhaust gas modulating valve 7 do not have standard-sized sheet then to increase high pressure exhaust gas modulating valve 7 apertures, if high pressure exhaust gas modulating valve 7 already standard-sized sheet then finish.
If the relative two-stage supercharging pressure target of the force value value of suction port place second pressure sensor senses reduces, then judge whether full cut-off of high pressure exhaust gas modulating valve 7, if there is not full cut-off then to turn down high pressure exhaust gas modulating valve 7 apertures, if high pressure exhaust gas modulating valve 7 cuts out and judges then whether variable-area nozzle 8 closes, finish if closed then, then do not reduce variable-area nozzle 8 apertures if close.
Concrete control strategy and controlling method are as follows
1) variable-area nozzle control strategy
(a) variable-area nozzle stable state control strategy, wherein, stable state refers to motor and is in steady working condition, and namely rotating speed and load are constant substantially.
Sensors such as throttle position switch 2, engine rotation speed sensor 3, first pressure transducer 11, first pressure transducer 5, ambient pressure sensor 17 are gathered each signal and are passed to ECU, and these signals have passed through the digital filtering of software program and handled.The throttle property calculation is looked into the one 2 dimension characteristic MAP figure according to engine speed and throttle position and is obtained engine load amount Engine_Duty, and the one 2 dimension characteristic MAP is obtained by the engine matching and calibration test.This carrying capacity is the percentage of peak torque under relative this rotating speed of output torque under the condition of this engine speed and throttle position.Look into the 22 dimension characteristic MAP figure according to engine speed and engine load amount and obtain secondary initial target boost pressure value P under this operating mode T0, because Fig. 1 is seen at the intake manifold place of the collection position of actual supercharge pressure behind intercooler.Therefore in the place of Different Altitude and latitude, the variation of external pressure and ambient temperature can have influence on the air quantity that enters cylinder, gathers external pressure and ambient temperature is carried out corrected Calculation to the air quantity that enters cylinder.Look into the one 1 dimension property list according to external pressure and obtain pressure correction value P R1, the one 1 dimension property list is obtained by the matching and calibration test.Look into the 21 dimension property list according to ambient temperature and obtain pressure correction value P R2, the 21 dimension property list is obtained by the matching and calibration test.Final two-stage supercharging pressure target value is calculated according to following formula:
P t=P t0+P r1+P r2
First error module compares the engine charge pressure signal of second pressure transducer, 5 generations and final two-stage supercharging pressure target value, obtains pressure divergence Δ P(final goal boost pressure P tPoor with actual supercharge pressure P).Serve as that the control algorithm of closed-loop digital PI feedback control of control target is as follows with actual supercharge pressure signal in the suction tude:
u = K P Δ P n + K I Σ k = 1 n ΔP k
The digital control of single-chip microcomputer is the control algorithm in discrete time territory, Δ P nBe the final goal boost pressure of current time and the difference of actual supercharge pressure, K P, K IBe respectively ratio and the integral parameter of PI control, u is the closed-loop feedback control signal, namely controls variable-nozzle blade opening control signal.For preventing the excessive pressurized machine hypervelocity that causes of boost pressure, limiting module is set, function is for limiting the actual supercharge pressure value greater than maximum pressure limits value U MaxVGT, this U MaxVGTCorresponding control signal when being variable-nozzle blade opening maximum, the VGT control signal can be determined according to formula:
U VGT=min(u,U MaxVGT)
Adopt closed loop control, and control signal can guarantee effectively that all from external environment condition and rating test control steadily.
(b) variable-nozzle cross section transient control strategy, wherein the instantaneous conditions load and the rotating speed that refer to motor changes.
At instantaneous conditions, along with the variation of engine speed and load, exhaust energy is corresponding to change.Be operated in constant rotating speed and when load in steady state engine, the increase of target boost pressure or reduce can be simply by reducing or supercharging nozzle ring aperture realizes.But under transient state, but there is not simple rule, when target boost pressure rises, might be by reducing, increase even keeping the nozzle ring aperture and realize.Therefore, only rely on the PI algorithm to be difficult to realize the stable and level and smooth control performance of instantaneous conditions, need to add the direct feedforward control of nozzle vane aperture for this reason.To obtain particularly to be determined by the optimum nozzle blade opening MAP figure that demarcates, optimum nozzle blade opening MAP figure by rotating speed, load and air-distributor pressure under the steady state condition determine namely finds feedforward control amount u ' in optimum nozzle blade opening MAP figure.
The 3rd error module is set in the control algorithm, and function is with closed-loop feedback control signal u and feed-forward control signals u ' summation, obtains VGT transient control signal:
U UGT ′ = u + u ′
When engine operation, at first judge for steady state condition or instantaneous conditions.Under steady state condition, in order to improve controllability, need to strengthen the PI control force; But under instantaneous conditions, because of the boost pressure bad response, if PI control excess produces vibration probably.Therefore need the PI control ability be set not sacrificing under the controlled prerequisite of stable state.The difference DELTA P of monitoring actual supercharge pressure and best boost pressure in the actual motion n, as Δ P nSurpass prespecified range, think vibration has taken place, stop feedback control this moment, and only keep feedforward control; In case eliminated vibration by independent feedforward control, feedback control is resumed work immediately.
2) high pressure stage turbine modulating valve control strategy
The 2nd error module is with closed-loop feedback control signal u and U MaxVGTDiffer from, produce the 2nd error signal.RV II control module will differ from storage in the RV minimum value (U that makes comparisons MinRVRefer to the minimum corresponding control signal of turbine control valve opening), produce the control signal U that controls RV RVFormula is:
U RV=max(U minRV,u-U MaxVGT)
Be that high pressure stage turbine control valve opening is exactly these two control signal higher values.
3) low pressure stage turbine modulating valve control strategy
Look into the 31 dimension property list according to external pressure and obtain initial one-level boost pressure desired value, because the one-level supercharging is not directly to have influence on to enter engine air tolerance, so only need be to air inlet correction after the high pressure stage, the one-level boost pressure calibration value that checks in is and the boost pressure desired value, the 4th error module is made comparisons actual one-level boost pressure value and one-level boost pressure calibration value that the first class pressure sensor obtains, obtain pressure divergence Δ P, by the 2nd PI control module output modulating valve control signal.
High pressure stage and low pressure stage turbine modulating valve PI control are to control respectively, and algorithm is the same, specifically no longer describes.
In addition, the continuous testing environment pressure of ambient pressure sensor is searched the 4th one dimension external pressure performance plot, and when external pressure during greater than 80kPa, the BV I is opened, when external pressure less than 80kPa, the BV I is closed.
The above only is preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.

Claims (4)

1. adjustable supercharge control system of secondary, it is characterized in that, the variable-nozzle cross section high pressure stage pressurized machine and the low pressure stage pressurized machine that comprise series connection, described low pressure stage pressurized machine comprises low pressure stage gas compressor (14) and low pressure stage turbo machine (15), is respectively arranged with low-pressure admission bypass valve (13) and low pressure exhaust modulating valve (16) at the bypass line of described low pressure stage gas compressor (14) and low pressure stage turbo machine (15); Described high pressure stage pressurized machine comprises high pressure stage gas compressor (9) and high-pressure turbine stage (10), described high-pressure turbine stage (10) disposes variable-area nozzle (8) and the bypass line in parallel with high-pressure turbine stage (10) is provided with high pressure exhaust gas modulating valve (7), pipeline between low pressure stage gas compressor (14) and the high pressure stage gas compressor (9) is provided with first pressure transducer (11), be provided with second pressure transducer (5) at the suction port place of motor, the variable-area nozzle of described high-pressure turbine stage (8), high pressure exhaust gas modulating valve (7) with low pressure exhaust modulating valve (16) but step-less adjustment and all being connected with ECU (Electrical Control Unit) is controlled.
2. the adjustable supercharge control system of secondary as claimed in claim 1 is characterized in that, described high pressure exhaust gas modulating valve (7) is built-in modulating valve.
3. the adjustable supercharge control system of secondary as claimed in claim 1 or 2 is characterized in that, described low-pressure admission bypass valve (13) has only standard-sized sheet and complete shut-down two states.
4. as the controlling method of the adjustable supercharge control system of each described secondary of claim 1-3, it is characterized in that, may further comprise the steps,
1) behind the engine start, ECU at first reads current environment pressure, if greater than 80Kpa, and then standard-sized sheet external low-pressure admission bypass valve (13) and low pressure exhaust modulating valve (16), as if less than 80Kpa, external low-pressure admission bypass valve (13) full cut-off then;
2) ECU reads current engine speed and throttle position and carrying capacity, temperature etc. and obtains current state next stage boost pressure desired value and two-stage supercharging pressure target value by demarcating MAP figure, if the force value of current relatively first pressure sensor senses of one-level boost pressure desired value raises, then judge whether standard-sized sheet of low pressure exhaust modulating valve (16), if there is not standard-sized sheet then to increase the aperture of low pressure exhaust modulating valve (16), if low pressure exhaust modulating valve (16) standard-sized sheet then finish; If the force value of current relatively first pressure sensor senses of one-level boost pressure desired value reduces, then judge whether complete shut-down of low pressure exhaust modulating valve (16), if there is not complete shut-down then to reduce low pressure exhaust modulating valve (16) aperture, if low pressure exhaust modulating valve (16) complete shut-down then finish; If changing, the force value of current relatively first pressure sensor senses of one-level boost pressure desired value then do not adjust;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value raises, then judge whether standard-sized sheet of variable-area nozzle (8), if do not have standard-sized sheet then to increase variable-area nozzle (8) aperture, if standard-sized sheet is then judged whether standard-sized sheet of high pressure exhaust gas modulating valve (7); If high pressure exhaust gas modulating valve (7) do not have standard-sized sheet then to increase high pressure exhaust gas modulating valve (7) aperture, if high pressure exhaust gas modulating valve (7) already standard-sized sheet then finish;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value reduces, then judge whether full cut-off of high pressure exhaust gas modulating valve (7), if there is not full cut-off then to turn down high pressure exhaust gas modulating valve (7) aperture, if high pressure exhaust gas modulating valve (7) cuts out already and judges then whether variable-area nozzle (8) closes, finish if closed then, then do not reduce variable-area nozzle (8) aperture if close;
If working as the force value of nose air intake place second pressure sensor senses relatively, two-stage supercharging pressure target value do not have variation then not adjust.
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