CN1374444A - Variable nozzle turbocharging control method and system for vehicle engine - Google Patents
Variable nozzle turbocharging control method and system for vehicle engine Download PDFInfo
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- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The present invention relates to electric control system for turbocharging of engine and the variable nozzle turbocharging control method and system features that in the electric control system,target pressure value is obtained through collecting the rotation speed, oil valve position, charging pressure and intake temperature of the engine and judging the working state of the engine. In the system, stepped motor as the executor is connected to the regulating crank of turbine nozzle ring via a link. During the transition course, the nozzle ring opening is regulated to some certain value by the executor through open-loop predication control; and while during stable state, closed-loop digital PID control has the charging pressure signal of intake manifold as controlled target.
Description
Technical field
The present invention relates to a kind of engine turbine pressurization system, particularly a kind of automobile-used variable nozzle turbocharging system realizes the optiumum control of variable-area nozzle position by electronic control unit and software control algorithm.
Background technique
Vehicle turbocharger will adapt to the rotation speed change scope of motor broadness.The shortcoming that the constant cross-section turbosupercharger exists has: (1) is when time of engine low speed, because the energy that waste gas provides seldom, the rotating speed of turbosupercharger is low excessively, be difficult to provide suitable boost pressure and enough air inflows, motor is difficult to produce big low speed torque, causes its low-speed performance to be difficult to be significantly improved.When (2) high engine speeds turns round,, may cause the pressurized machine hypervelocity because delivery temperature and pressure are very high.(3) only there be pneumatic the contact between pressurized machine and the motor, the response lag of pressurized machine in accelerating process.Because the response that the response ratio air inflow that the motor oil mass is supplied with is supplied with is fast, can cause pick-up of engine bad, produces and quicken to smolder phenomenon.
Therefore the matching ratio of constant cross-section turbosupercharger and motor is difficult, if turbosupercharger designs coupling according to the high engine speeds operating mode, rotating speed is low excessively in the time of will low speed occurring, boost pressure is low excessively, if design coupling, then when high speed, for avoiding occurring the pressurized machine hypervelocity according to the low speed operating mode, at the engine exhaust pipe place waste gas bleed valve need be installed, waste a part of exhaust energy.
Adopt variable nozzle turbocharger can well solve the matching problem of turbosupercharger and motor.The vehicular engine variable nozzle turbocharger is the nozzle ring that has increased an adjustable nozzles cross section on the constant cross-section turbosupercharger, on nozzle ring one circle a plurality of blades are arranged, thereby they can rotate around the axle center of oneself and change nozzle cross-section, it is regulated by the control loops on the nozzle ring and realizes, the rotation of control loops is by the outer adjusting crank control of turbine case.Rotate and regulate crank, drive the control loops rotation, nozzle blade is rotated simultaneously around the axle center of oneself separately.By changing the angle of nozzle blade, change the actual internal area of turbine inlet.The working principle of automobile-used variable nozzle turbocharger is as follows: during (1) low engine speed, allow the nozzle blade aperture reduce, the turbine actual internal area reduces, the corresponding raising of the waste gas rate of outflow, supercharger speed rises, and compressor delivery pressure increases, and air input of engine by air increases; (2) during high speed, allow the nozzle blade aperture increase, the turbine actual internal area increases, and the waste gas rate of outflow reduces relatively, and supercharger speed reduces relatively, and boost pressure reduces, and prevents that supercharging is excessive.(3) when quickening, reduce nozzle ring aperture aperture, improve supercharger speed at short notice rapidly, improve engine boost pressure, enough air inflows are provided, improve its acceleration performance.
The adjusting of the nozzle ring aperture of vehicular engine variable nozzle turbocharger is to realize by the pneumatic actuator of a diaphragm type at present, the gas pressure value of the one side by changing diaphragm spring is regulated diaphragm displacement, thereby regulates the adjusting crank of nozzle ring aperture.Gas pressure is controlled by solenoid valve or vacuum pump.Electronic control unit is controlled the displacement of diaphragm spring in the vacuum actor according to the residing operating mode of motor, thus boost pressure value in the control suction tude.Thereby the benefit of this mechanism is the aperture that degree of vacuum can change adjusting nozzle ring that can be continuous continuously.
Its shortcoming mainly contains: (1) because executive component is many, the system architecture complexity increases the cost of making.(2) regulate by the degree of vacuum of diaphragm spring, when engine transient changed, the fast-response of nozzle ring action can be not enough.
Summary of the invention
Purpose of the present invention and task provide a kind of vehicular engine variable nozzle turbocharging control method and system, realize the adjusting to the turbine nozzle ring aperture.Can both regulate the nozzle cross-section of turbosupercharger to the various operating modes of motor.Hardware system is easy for installation, and cost is low, the reliability height.Can with different motor and Matching of Turbocharger.
Purpose of the present invention and task are achieved through the following technical solutions:
A kind of vehicular engine variable nozzle turbocharging control method, this controlling method is characterised in that:
(1) uses ECU (Electrical Control Unit), the employing single-chip microcomputer is a microcontroller, gather speed probe, throttle position switch by the software control procedure that is stored in the single-chip microcomputer, the signal of boost-pressure sensor and intake air temperature sensor, judge that according to the variance ratio of throttle position signal engine operation is at stable state or transient working condition, determine the critical value of throttle position variance ratio by engine rig test according to the performance of motor, when the variance ratio absolute value of throttle position signal is a steady state condition during less than this critical value, otherwise be transient working condition;
(2) when the absolute value of the variance ratio of throttle position signal during less than this critical value, engine operation is at steady state condition, employing is the digital PID closed loop control of control target with the boost pressure, the dreamboat value of boost pressure is according to throttle position and engine rotational speed signal, looking into stable state boost pressure MAP figure obtains, value among this critical value and the stable state boost pressure MAP figure and pid parameter are determined by the Engine Matching test, directly are stored in the single-chip microcomputer;
(3) when the variance ratio of throttle position signal during greater than this critical value, engine operation is being quickened transient working condition, the control of employing open-loop prediction, according to this throttle position and engine rotational speed signal constantly, look into open loop position MAP figure and obtain the nozzle ring positional value, variance ratio according to this moment throttle position obtains the position correction value again, both additions obtain the target location value, directly actuate actuators is regulated the nozzle ring aperture to this desired value, open loop position MAP figure value and variance ratio correction value are obtained by the Engine Matching experiment, directly are stored in the single-chip microcomputer;
(4) when the negative value of the variance ratio of throttle position signal during greater than this critical value, engine operation keeps nozzle ring position aperture constant at the deceleration transient working condition.
The invention provides a kind of vehicular engine variable nozzle turbocharging control system of implementing described method, mainly comprise electronic control unit, the power supply of electric power is provided for system, final controlling element, sensor, variable nozzle turbocharger, it is characterized in that: it is microcontroller that described electronic control unit adopts single-chip microcomputer, also comprise the memory expansion chip, the drive circuit that is used for actuate actuators, be used to carry out the fault display circuit of fault diagnosis, realize the communicating circuit of serial communication between single-chip microcomputer and the computer, power circuit and be stored in software control procedure in the memory expansion chip in advance, described final controlling element adopts stepper motor, and this stepper motor is regulated crank by connecting rod with the nozzle ring of turbine and is linked to each other, described sensor comprises the speed probe of gathering engine speed, gather the throttle position switch of engine throttle position, gather the pressure transducer of engine boost pressure, gather the temperature transducer of Engine Inlet Temperature.
Single-chip microcomputer of the present invention adopts MC68HC11E9; Described memory expansion chip adopts 27256; Described drive circuit adopts integrated chip L297 and L298; Described communicating circuit adopts the MAX232 chip.
Speed probe of the present invention is installed in the flywheel shell of engine place; Throttle position switch is installed in the injection pump rack place; Boost-pressure sensor and intake air temperature sensor are installed in the engine intake manifold place.
The present invention compared with prior art, have the following advantages and beneficial effect: (1) is because the employing stepper motor is the control software of final controlling element and real-time, the transient process speed of response is fast, can give full play to engine performance, improve power character, it is few to reduce emission level (2) executive component, and system architecture is simple, cost is low, the reliability height.(2) can work alone, only need to change software and mate the MAP graph parameter on a small quantity, can realize coupling with various different motors.
Description of drawings
Fig. 1 is an automatical control system hardware linkage structure sketch.
Fig. 2 is a master singlechip circuit.
Fig. 3 is a drive circuit.
Fig. 4 is the memory expansion circuit.
Fig. 5 is a reset circuit.
Fig. 6 is a fault display circuit.
Fig. 7 is a communicating circuit.
Fig. 8 is software controlling strategies figure.
Fig. 9 is the program overview flow chart.
Figure 10 is the work cycle flow chart.
Figure 11 is the closed loop control subroutine flow chart.
Figure 12 is an open loop control subprogram flow chart.
Figure 13 is the pressurization system installation diagram.
Embodiment
Specify working principle of the present invention, concrete structure and embodiment below in conjunction with accompanying drawing.
Fig. 1 is that the hardware configuration of electronic control unit connects sketch.Microcontroller adopts the MC68HC11E9 single-chip microcomputer, intake temperature after throttle position, the supercharging and suction pressure are analogue signal, its value is defeated by the AD acquisition port of single-chip microcomputer, and engine speed, switch starter and fault diagnosis switch are digital signal, is defeated by the Digital Detecting mouth of single-chip microcomputer.Deposit control software in the memory expansion circuit, it directly links to each other with single-chip microcomputer.Power circuit provides 5 volts of voltages for single-chip microcomputer and other chip, and simultaneously for drive circuit provides 12 volts of driving voltages, its power supply is provided by outside storage battery.Clock circuit provides 8M crystal oscillator signal for single-chip microcomputer.Reset circuit links to each other with the mouth that resets of single-chip microcomputer, is used for hand reset control software.Communicating circuit links to each other with the microcontroller communication mouth, realizes the serial communication with supervisory control comuter.Fault display circuit shows the hardware or the sensor fault of electronic control unit by Micro Controller Unit (MCU) driving.Drive circuit provides the logical signal of driving by single-chip microcomputer, and it produces drive stepper motor.Stepper motor directly links to each other with the adjusting crank of variable nozzle turbocharger.
Fig. 2 is a master singlechip circuit, and crystal oscillator Y1 is 8M, 5 vor signals that VCC provides for power circuit.IGNSW is that ignition switch connects signal, and ERRVIEW connects signal for the fault display switch.RESET links to each other with reset circuit.RXD links to each other with communicating circuit with TXD, and RXD accepts computer and transmits signal, and TXD sends signal to computer.LRESET, STEPCL, DIRECT and LENABLE link to each other with drive circuit, LRESET is the drive circuit reset signal, LENABLE is the drive circuit enable signal, DIRECT is a stepper motor moving direction control signal, STEPCL is the pulse signal that rising edge triggers, control step motor step motion.ERRLT is the fault display circuit drive signal.SOUT is the engine speed input signal.The PE0 mouth is gathered throttle position signal, and the PE2 mouth is gathered intake air temperature signals, and the PE1 mouth is gathered the suction pressure signal.AD0 to AD7, A8 to A15, E, AS, R/-W link to each other with the storage expander.
Fig. 3 is a drive circuit, and L297 chip one end links to each other with single-chip microcomputer, and an end links to each other with the L298 chip, and the logical signal of driving is provided.L298 is high-power dual H-bridge driving chip, and the power drive of final controlling element is provided.O1 and O2 are connected on the two ends of winding mutually of stepper motor, and O3 is connected on another two ends of winding mutually with O4.
Fig. 4 is the memory expansion circuit, and AD0 is data and low eight bit address line multiplexed signals to AD7, and A8 is a high-order address signal to A14.E and R/-W provide 27256 read-write control signal, and AS provides 74HC373 address date latch control signal.27256 is eprom memory, and control software is stored in wherein.
Fig. 5 is a reset circuit, realizes the hardware reset function of single-chip microcomputer.MC34064 is the low voltage detection chip, and single-chip microcomputer automatically resets when the electronic control unit power supply voltage is lower than certain value.Switch S 1 is used for the hand reset operation.
Fig. 6 is a fault display circuit, ERRLT is by the PA6 mouth output of single-chip microcomputer, and the high-low level time of this signal of program control and conversion times are controlled the light on and off of light emitting diode LS1, different faults has different light on and off modes, and contrast fault code table just can be known to be out of order and denys.
Fig. 7 is the RS232 communicating circuit, realizes data communication with the serial ports of PC.RXD and TXD connect the single-chip microcomputer respective pin, and the data that YTXD and YRXD connect the computer com port respectively send and data reception pin.
Fig. 8 is software control method figure, in conjunction with this figure introduce the controlling method principle and structure as follows:
A is a tach signal, and t is a throttle position signal, and b and s have carried out the digital filtering processing to them respectively, and r is the calculation of throttle position rate, judges that throttle changes speed, and q has carried out digital filtering to the throttle variance ratio.D is the steady transient state decision logic of motor, and the throttle variance ratio is during less than the predefined critical value of absolute value, and engine operation is in stable state, otherwise is transient state.This critical value is determined by match test at concrete motor.
Adopt open loop control: c to being independent variable during transient state with throttle and rotating speed, the actuator driven step number is the three-dimensional MAP figure interpolation of of dependent variable, e carries out the correction of open loop transient state step number according to the throttle variance ratio, o is an intake air temperature signals in the engine intake manifold, n carries out the correction of open loop transient state step number according to intake temperature, obtains driving step number Y=Y1+Y1 '+Y1 at last ".G is a final controlling element, adopts stepper motor among the present invention.
Adopt during stable state with the boost pressure in the intake manifold is the closed-loop digital PID control of control target: p to being independent variable with throttle and rotating speed, boost pressure is the three-dimensional MAP figure interpolation of of dependent variable, f has carried out the steady state pressure correction according to the throttle variance ratio, n has carried out the correction of closed loop boost pressure according to intake temperature
The boost pressure value of i for gathering, j has carried out digital filtering to it, boost pressure desired value P and actual value Pr ' draw difference DELTA P, k drives the variable PID control ratio parameter value that step number is selected according to reality, 1 is to drive the variable PID control integral parameter value that step number is selected according to reality, and m drives the variable PID control differential parameter value that step number is selected according to reality.Its closed loop pid control algorithm formula (1) is as follows:
Δ P
nCurrent measurement boost pressure and target boost pressure difference, Δ P
N-1Last boost pressure and target boost pressure difference, the K of measuring
P, K
I, K
DBe respectively ratio, integration and the differential parameter of PID control, S
fThe step motor control step number.
Pid parameter adopts different values according to the different operating mode of motor, its deterministic process is as follows: some typical conditions of at first selecting engine operation, at these steady state condition points, obtain the pid parameter value of corresponding one group of the best by engine test, at other steady state condition point, determine their pid parameter value by linear interpolation.
Fig. 9 is total program flow diagram of the control software write according to control algorithm, and single-chip microcomputer is finished the initial work of initialization, Abort Timer initialization and the actuator driven circuit in system register and RAM Control Parameter district in initialization section.Then judge the enable switch state, interrupt the periodic duty program, enter the wait cyclic program if disconnect if connect to enter.Wait for the not work of cyclic program execution phase motor, program can be carried out showing processing with computer by serial communication and fault, constantly be detected the enable switch state simultaneously.After detecting start switch, show that motor has begun to rotate, program can jump to immediately interrupts the periodic duty program.
Figure 10 is interruption of work circulation process figure, and this interrupts by relatively timer TOC1 setting of single-chip microcomputer output, and every 4ms produces once.After entering interrupt routine, at first clear timer interrupt flag bit interrupts allowing next time.In the fault diagnosis part; program detection failure switch connection is not; then enter the fault diagnosis subroutine if connect; this subroutine is carried out diagnostic process respectively to the RAM and the ROM of intake temperature, boost pressure, throttle position and four sensors of rotating speed and the single-chip microcomputer of employing; exceed the normal range of operation of this value if find the sensor acquisition value; perhaps break down in single-chip microcomputer RAM or ROM district; then set corresponding diagnostic trouble code; show by fault display circuit; simultaneously in program, system is protected processing, to prevent accident.Then do not carry out fault diagnosis if disconnect, directly enter next step program.SCI communication treated section is at first judged with supervisory control comuter has data communication not, if receive the data that computer terminal is sent, then according to the difference of this value, carry out sending signals such as engine speed that single-chip microcomputer collects, throttle position, boost pressure to computer, or the data that the RAM parameter region is made amendment of accepting that computer terminal sends.Gather the filtering boost pressure and partly gather plenum pressure signal and carry out low-pass digital filter, because this signal is the target component of control, so each the interruption all carried out once.The revolution speed calculating part is the tachometer value of calculation engine in real time, external pulse accumulation timer by single-chip microcomputer PA7 mouth interrupts realizing, if motor revolution 1/3rd circles produce once interrupt, the single-chip microcomputer E clock number between twice continuous interruption is M, and then the engine speed n of Ji Suaning is:
The engine speed value that calculates leaves the RAM district of single-chip microcomputer in.Program is carried out different task processing according to the size of the value of a cycle counter of setting afterwards.When the value of cycle counter is 1, programmed acquisition engine oil door position signal, judgement is stable state or transient state, to enter corresponding closed-loop or open loop processor; When the value of cycle counter was 2, program was looked into pressure MAP figure according to engine speed and two parameters of throttle position, draws the control target force value that needs, and enters the processor identical with first branch afterwards; The value of cycle counter is 3 o'clock, and the boost pressure and the intake temperature of gathering are carried out correcting process, and these data and method for correcting are provided by motor producer; The value of cycle counter is 4 o'clock, carries out the primary fault diagnostic process, and the 3rd branch also carries out the program identical with first and second branches with the 4th branch afterwards.When the value of cycle counter is 5 between 200 the time, program is only called the closed loop control subroutine, and this situation is only carried out during in stable state in engine operation, also promptly when in the transient state open loop, only carries out the circulation of preceding four branches.
Figure 11 is the closed loop control subroutine flow chart.Draw the target boost pressure value according to looking into three-dimensional boost pressure MAP figure among Figure 10, actual acquisition to the boost pressure value deduct target boost pressure and be worth the boost pressure error, calculate the proportional of digital PID control respectively according to formula (1), integral and differential term, when integration occurring when saturated, meet limit and weaken.To the positional value that three summations are calculated, drive stepping motor is to this position, and program is returned afterwards.
Figure 12 is an open loop control subprogram flow chart.Positive negative judgement according to the throttle position variance ratio is accelerating mode or decelerating mode, when the throttle position variance ratio is that timing is an accelerating mode, look into three-dimensional open loop position MAP figure according to throttle position and engine speed, draw a stepper motor positional value, carrying out open loop again quickens to revise, look into open loop correction MAP figure according to the throttle position variance ratio, draw the open loop reduction value, the two addition obtains stepper motor target location value, drive stepping motor is returned behind this position, when the throttle position variance ratio is a decelerating mode when negative, keep the stepper motor invariant position this moment, directly returns.
Figure 13 is a pressurization system connection diagram of the present invention.
Below in conjunction with this figure concrete enforcement of the present invention is described: the sensor 16 of gathering tach signal is installed in engine flywheel 17 places.The sensor 14 of gathering throttle position signal is installed in the throttle place, rotation coaxial with it.The sensor of gathering interior boost pressure 13 of intake manifold and intake temperature 12 is installed on the intake manifold 11.Variable nozzle turbocharger is installed in engine exhaust pipe one side, the suction port 7 of variable nozzle turbine 3 links to each other with enmgine exhaust 9, the suction port 5 blowing air air-strainer of the gas compressor 8 of the other end of pressurized machine axle 6, blower outlet 10 links to each other with engine intake manifold 11, final controlling element 1 is a stepper motor, is installed in gas compressor one side and regulates crank by connecting rod 2 and turbine variable-nozzle to link to each other.
Working procedure of the present invention is as follows:
Motor begins starting, and electronic control unit powers on, and actuate actuators prevents the pressurized machine hypervelocity to the maximum nozzle ring position.Electronic control unit detects the signal of rotating speed, throttle position, boost pressure and intake air temperature sensor, judges the operating mode of motor.
When motor quickens, fuel injection quantity increases, the electronic control unit actuate actuators, reduce the variable nozzle ring blade opening, improve supercharger speed rapidly, strengthen the air inflow of gas compressor end, coordinate mutually with the increase of fuel injection quantity, make motor that big output torque is provided, the phenomenon of smoldering of avoiding general engine accelerating course to produce.
During engine retard, fuel injection quantity reduces, and keep the nozzle ring aperture constant this moment, and air input of engine by air descends with rotating speed and slightly reduces, but the minimizing of oil mass is faster, therefore the phenomenon of smoldering can not occur.
During the engine steady state running, need constant boost pressure, to guarantee quantitative air inlet, to the disturbance of engine throttle and rotating speed, and the variation of intake temperature, adopt closed loop PID control to guarantee constant boost pressure value.When the actual supercharge pressure value is lower than desired value, turn down nozzle blade and improve boost pressure, when the actual supercharge pressure value is higher than desired value, increases nozzle blade and reduce boost pressure.
Application area of the present invention: various Vehicle Turbocharged motors, especially automobile-used variable nozzle turbocharging diesel engine.
Claims (7)
1. vehicular engine variable nozzle turbocharging control method, this controlling method is characterised in that:
(1) utilizes ECU (Electrical Control Unit), the employing single-chip microcomputer is a microcontroller, gather speed probe, throttle position switch by the software control procedure that is stored in the single-chip microcomputer, the signal of boost-pressure sensor and intake air temperature sensor, judge that according to the variance ratio of throttle position signal engine operation is at stable state or transient working condition, determine the critical value of throttle position variance ratio by engine rig test according to the performance of motor, when the variance ratio absolute value of throttle position signal is a steady state condition during less than this critical value, otherwise be transient working condition;
(2) when the absolute value of the variance ratio of throttle position signal during less than this critical value, engine operation is at steady state condition, employing is the digital PID closed loop control of control target with the boost pressure, the dreamboat value of boost pressure is according to throttle position and engine rotational speed signal, looking into stable state boost pressure MAP figure obtains, value among this critical value and the stable state boost pressure MAP figure and pid parameter are determined by the Engine Matching test, directly are stored in the single-chip microcomputer;
(3) when the variance ratio of throttle position signal during greater than this critical value, engine operation is being quickened transient working condition, the control of employing open-loop prediction, according to this throttle position and engine rotational speed signal constantly, look into open loop position MAP figure and obtain the nozzle ring positional value, variance ratio according to this moment throttle position obtains the position correction value again, both additions obtain the target location value, directly actuate actuators is regulated the nozzle ring aperture to this desired value, open loop position MAP figure value and variance ratio correction value are obtained by the Engine Matching experiment, directly are stored in the single-chip microcomputer;
(4) when the negative value of the variance ratio of throttle position signal during greater than this critical value, engine operation keeps nozzle ring position aperture constant at the deceleration transient working condition.
2. implement a kind of vehicular engine variable nozzle turbocharging control system of method according to claim 1, mainly comprise electronic control unit, the power supply of electric power is provided for system, final controlling element, sensor, variable nozzle turbocharger, it is characterized in that: it is microcontroller that described electronic control unit adopts single-chip microcomputer, also comprise the memory expansion chip, the drive circuit that is used for actuate actuators, be used to carry out the fault display circuit of fault diagnosis, realize the communicating circuit of serial communication between single-chip microcomputer and the computer, power circuit and be stored in software control procedure in the memory expansion chip in advance, described final controlling element adopts stepper motor, and this stepper motor is regulated crank by connecting rod with the nozzle ring of turbine and is linked to each other, described sensor comprises the speed probe of gathering engine speed, gather the throttle position switch of engine throttle position, gather the pressure transducer of engine boost pressure, gather the temperature transducer of Engine Inlet Temperature.
3. according to the described a kind of vehicular engine variable nozzle turbocharging control system of claim 2, it is characterized in that: described single-chip microcomputer adopts MC68HC11E9.
4. according to the described a kind of vehicular engine variable nozzle turbocharging control system of claim 2, it is characterized in that: described memory expansion chip adopts 27256.
5. according to the described a kind of vehicular engine variable nozzle turbocharging control system of claim 2, it is characterized in that: described drive circuit adopts integrated chip L297 and L298.
6. according to the described a kind of vehicular engine variable nozzle turbocharging control system of claim 2, it is characterized in that: described communicating circuit adopts the MAX232 chip.
7. according to the described a kind of vehicular engine variable nozzle turbocharging control system of arbitrary claim in the claim 2 to 6, it is characterized in that: speed probe is installed in the flywheel shell of engine place, throttle position switch is installed in the injection pump rack place, and boost-pressure sensor and intake air temperature sensor are installed in the engine intake manifold place.
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| CNB021174180A CN1162611C (en) | 2002-04-19 | 2002-04-19 | Variable nozzle turbocharging control method and system for vehicle engine |
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| CNB021174180A CN1162611C (en) | 2002-04-19 | 2002-04-19 | Variable nozzle turbocharging control method and system for vehicle engine |
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2002
- 2002-04-19 CN CNB021174180A patent/CN1162611C/en not_active Expired - Fee Related
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