CN1828031A - Controller for internal combustion engine with supercharger - Google Patents

Abstract

A torque base control unit calculates target torque based on an accelerator position and engine speed. The control unit further executes calculation of target airflow rate, calculation of target intake pressure, and calculation of target boost pressure based on the target torque. Target throttle position is calculated based on the target airflow rate, target intake pressure, target boost pressure, actual boost pressure, and throttle passed intake temperature. An assist control unit calculates target turbine power based on the target airflow rate and the target boost pressure calculated by the torque base control unit and calculates actual turbine power based on exhaust information. Assist power of a motor attached to a turbocharger is calculated based on the power difference between the target turbine power and the actual turbine power.

Description

Be used to have the controller of the internal-combustion engine of pressurized machine

Technical field

The present invention relates to be applied to have for example controller of the internal-combustion engine of turbosupercharger of pressurized machine, described controller is suitably controlled the auxiliary power to pressurized machine.

Background technique

The turbosupercharger conduct is well-known by using exhaust power to the pressurized machine that sucks supercharging air.In recent years, electric auxiliary turbine pressurizer is developed, and wherein motor etc. is installed on the running shaft of turbosupercharger and according to the serviceability auxiliary exhaust power of internal-combustion engine.

Therefore disclosed controller promotes the blower operations of turbosupercharger based on the electric current of accelerator run amount and accelerator run speed controlling process motor among the JP-11-117933A.Disclosed controller simultaneously, is proofreaied and correct the auxiliary power amount according to engine speed and load value according to the speed of the change amount control opening throttle of accelerator position and the electric current of process motor among the JP-11-280510A.In this way, just can realize that supercharging according to driver's accelerator operation is to improve drive performance.Disclosed controller determines that based on power reference example is as wherein having specified the target boost pressure in advance and having supplied with the collection of illustrative plates that concerns between the power of electric motor and determine to supply with power of electric motor among the JP-2003-239754A, in addition, based on determining reference with respect to the actual boost pressure fluctuation corrected power of supplying with power of electric motor.By operation, just can carry out best all the time boost pressure control.

Yet, in traditional method, can carry out open loop control, and be difficult to suitably control auxiliary materials.In this case, when auxiliary materials unnecessarily increased, fuel consumption just may worsen.Also may when quickening, obtain the boost performance (acceleration performance) of driver's expection etc., and drive performance worsens.

JP-2002-21573A disclose a kind of in the air inlet path upstream or the downstream side of turbosupercharger set the technology of auxiliary compressor as the additional mechanical supercharging device.Auxiliary compressor is by for example electric motor operated.

Yet, above-mentioned announcement and unexposed controlling method how to control auxiliary compressor.Therefore, be difficult to suitable controlled quentity controlled variable operation auxiliary compressor.For example, in the configuration of auxiliary compressor by operations such as motor therein, when auxiliary compressor was unnecessarily operated, the generated energy of alternator etc. can increase, and therefore, fuel consumption can worsen.When the operation amount of auxiliary compressor is not enough, just can't when quickening to wait, obtain the boost performance (acceleration performance) that the driver expects, drive performance just may worsen like this.

Summary of the invention

Main purpose of the present invention provides a kind of controller that is used to have the internal-combustion engine of pressurized machine, and pressurized machine has for example motor of power assistance device, and the power that described controller can the power controlling auxiliary device is auxiliary to make it suitable.

As precondition, controller of the present invention is applied to internal-combustion engine, and internal-combustion engine has by exhaust power to the pressurized machine that sucks supercharging air be installed on the pressurized machine and the direct power assistance device of the power of hydraulic booster.In internal-combustion engine, the output torque of internal-combustion engine is regulated charge air flow speed by the airflow rate regulating device and is controlled.Especially, the target power of pressurized machine is based on that the airflow rate information calculations gets, and the actual power of pressurized machine (actual pressurized machine power) is calculated and to be got.Based target power and actual power can calculate the auxiliary materials of power assistance device.Based on the auxiliary materials of calculating, can the power controlling auxiliary device.For example, wish to make the comparison between target power and the actual power and calculate auxiliary materials based on difference power.

In brief, by the target power of pressurized machine and the comparison between the actual power, can grasp the underpower amount of intrinsic required pressurized machine power, and power assistance device can be driven corresponding to auxiliary materials in shortage.For example, can obtain the poor of target power and actual power, and the auxiliary materials power controlling auxiliary device that calculates based on difference power.Under this this situation, by the auxiliary materials that is set in shortage with target power, hydraulic booster power efficiently just.Because auxiliary materials is get by relatively calculating of power, thus with utilize another parameter for example the boost pressure situation of calculating auxiliary materials compare, can more directly carry out assist control with higher response.For example, the behavior of boost pressure is the result of assist control.Carry out in the situation of assist control based on boost pressure therein, can in control, postpone.The present invention can prevent this inconvenience.Therefore, suitably the power of power controlling auxiliary device is auxiliary.In addition, can improve fuel consumption, drive performance etc.

As precondition, controller of the present invention is applied to internal-combustion engine, and described internal-combustion engine has and is used for by exhaust power the pressurized machine that sucks supercharging air and the upstream that is provided in air inlet path pressurized machine or downstream side and the additional mechanical supercharging device operated as power source with the power that is different from exhaust.In internal-combustion engine, regulate charge air flow speed by using the airflow rate regulating device, output torque that can controlling combustion engine.Especially, the target power of pressurized machine is based on that the airflow rate information calculations of internal-combustion engine gets, and the actual power of pressurized machine (actual pressurized machine power) is calculated and got.Auxiliary materials additional mechanical supercharging device is based on target power and actual power and calculates and get, and uses the auxiliary materials control additional mechanical supercharging device that calculates.For example, preferably to target power with actual power compares and calculate auxiliary materials based on difference power.

As precondition, controller of the present invention is applied to internal-combustion engine, described internal-combustion engine has and uses exhaust power to the pressurized machine that sucks supercharging air be installed on the pressurized machine and the direct power assistance device of the power of hydraulic booster, and controller comes the output torque of controlling combustion engine by the fuel injection amount of fuel metering injection apparatus.Particularly, the target power of pressurized machine and actual power are calculated and are got.Target power and actual power compare each other, and result based on the comparison, the auxiliary materials of rated output auxiliary device.Use the auxiliary materials power controlling auxiliary device that calculates.

Description of drawings

Fig. 1 is the figure that shows the illustrative arrangement of the engine control system in the first embodiment of the present invention.

Fig. 2 is the control block diagram that shows the function of Engine ECU.

Fig. 3 A to 3D is the time diagram that shows the overview of electric turbosupercharger.

Fig. 4 is the control block diagram that shows electric turbine model.

Fig. 5 is the figure that shows the pressure loss model of interstage cooler model.

Fig. 6 is the figure that shows the cooling effect model of interstage cooler model.

Fig. 7 is the control block diagram that shows the details of target turbine output computing unit in the Auxiliary Control Element and actual turbines power calculation unit.

Fig. 8 shows the figure that concerns between boost pressure and the boosted temperature.

Fig. 9 shows the figure that concerns between pressurization energy and the compressor efficiency.

Figure 10 is the flow chart that shows the basic routine of Engine ECU execution.

Figure 11 is the flow chart of display-object throttle position calculation routine.

Figure 12 is the flow chart that shows the auxiliary power calculation routine.

Figure 13 is the flow chart of display-object turbine output calculation routine.

Figure 14 is the flow chart that shows actual turbines power calculation routine.

Figure 15 shows the auxiliary flow chart of determining routine.

Figure 16 A to 16F is the time diagram of the various actions when being presented at assist control.

Figure 17 A to 17D is the time diagram of the various actions when being presented at assist control in another way.

Figure 18 is the figure that shows the illustrative arrangement of the engine control system in the second embodiment of the present invention.

Figure 19 is the control block diagram that shows the function of Engine ECU.

Figure 20 is the figure that is used for the calculating pressure loss amount.

Figure 21 is the figure that is used to calculate targeted compression machine upstream pressure.

Figure 22 is the figure that is used to calculate auxiliary power.

Figure 23 is the control block diagram that shows the turbine model.

Figure 24 is the control block diagram of the details of the actual power computing unit in display-object power calculation unit and the Auxiliary Control Element.

Figure 25 is the flow chart that shows the auxiliary power calculation routine.

Figure 26 is the flow chart that shows the routine of calculating the targeted compression acc power.

Figure 27 is the flow chart that shows the routine of calculating the actual compression acc power.

Figure 28 shows the auxiliary flow chart of determining routine.

Figure 29 A to 29F is the time diagram of various actions when showing assist control.

Figure 30 is the figure that shows the illustrative arrangement of the engine control system in the third embodiment of the present invention.

Figure 31 is the control block diagram that shows the function of Engine ECU.

Figure 32 is the flow chart that shows the basic routine of Engine ECU execution.

Figure 33 is the flow chart that shows the fuel injection amount calculation routine.

Figure 34 A to 34F is the time diagram of various actions when showing assist control.

Embodiment

First embodiment

Embodiments of the invention are hereinafter described with reference to the accompanying drawings.In an embodiment, engine control system is configured for multi-cylinder gasoline engine on the vehicle as internal-combustion engine, and the motor of control system is equipped with electric auxiliary turbine pressurizer (hereinafter being also referred to as electric turbosupercharger) as pressurized machine.At first the overall illustrative arrangement figure of engine control system will be described referring to Fig. 1.

In motor 10 as shown in fig. 1, suction tude 11 is equipped with closure 14 as the air quantity regulating device, and its position is by for example adjusting such as DC motor of throttle actuator 15.Has the throttle position sensor that is used to detect throttle position in the throttle actuator 15.At the upstream side of closure 14, be equipped with the boost pressure sensor 12 that is used to detect closure upstream side pressure (by the boost pressure that below turbosupercharger of describing is generated) and be used to detect the inhaled air temperature sensor 13 of the intake temperature of closure upstream side.

Set baffle-box 16 in the downstream side of closure 14.Baffle-box 16 is equipped with the air inlet pressure sensor 17 (suction press detection device) that is used to detect suction pressure on the closure downstream side.The intake manifold 18 that is used for air is introduced the cylinder of motor 10 is connected to baffle-box 16.In intake manifold 18, be used to spray and the electromagnetic drive type Fuelinjection nozzle 19 of fuel supplying is installed near the suction port of cylinder.

The suction port and the relief opening that are respectively motor 10 have set intake valve 21 and exhaust valve 22.By opening the operation of intake valve 21, air-fuel mixture will import in the firing chamber 23.By opening the operation of exhaust valve 22, the waste gas after the burning just is discharged in the outlet pipe 24.Spark plug 25 is installed on the cylinder head of motor 10 cylinders.In the light-off period of expectation, apply a high pressure to spark plug 25 by the ignition mechanism that does not show that comprises spark coil.By applying high voltage, can be between the electrode of facing of each spark plug 25 the flashing discharge, and import mixture in the firing chamber 23 and can light and provide and burn.

On the cylinder block of motor 10, attaching crank angle sensor 26, it is used for along with the rotation of motor 10 at each predetermined degree in crank angle place (for example, every 30 degrees centigrade) and just exports rectangle degree in crank angle signal.

Turbosupercharger 30 is arranged between suction tude 11 and the outlet pipe 24.Turbosupercharger 30 has and sets the compressor impeller 31 that is used for suction tude 11 and set the turbine wheel 32 that is used for outlet pipe 24.Compressor impeller 31 is connected via axle 33 with turbine wheel 32.For axle 33 has set motor (motor) 34 as power assistance device.Motor 34 passes through from the power operation of battery (not shown) supply and the rotation of auxiliary axis 33.Motor 34 is equipped with temperature transducer 35 and detects motor temperature.

In turbosupercharger 30, turbine wheel 32 is deflated the exhaust rotation of flowing in the pipe 24.Rotating force is delivered on the compressor impeller 31 via axle 33.The suction air that flows in suction tude 11 is carried out supercharging by compressor impeller 31 compressions.The air of supercharging is cooled off by interstage cooler 37 in turbosupercharger 30.After this, the air of cooling is supplied with the downstream side.By using interstage cooler 37 coolings to suck air, can improve the charging efficiency that sucks air.

The air filter of Xian Shiing is not provided in the top side of suction tude 11 and is used to detect the downstream side that the airometer 41 that sucks air quantity is provided in air filter.In addition, in control system, set the accelerator position sensor 43 that is used to detect accelerator pedal travel amount (accelerator position) and be used to detect atmospheric atmosphere pressure sensor 44.

As known, Engine ECU (ECU (Electrical Control Unit)) the 50th constitutes as the main body that comprises CPU, ROM and RAM by using microcomputer.Be stored in various director demons among the ROM by execution, Engine ECU 50 can be carried out the various controls of motor 10 according to each engine operation state.Especially, multiple testing signal is from above-mentioned each sensor input Engine ECU 50.Engine ECU 50 is based on the driving of each testing signal computing fuel emitted dose of importing, ignition timing etc. and control Fuelinjection nozzle 19 and spark plug 25.

In an embodiment, Electronic Throttle Control is carried out so-called moment of torsion basic controlling.As a reference throttle position is controlled to be desired value by the moment of torsion that motor 10 is generated.Briefly, Engine ECU 50 based on the testing signal of accelerator position sensor 43 calculate target torque (required torque), calculate the target airflow rate that satisfies target torque and based target airflow rate, each pressure and intake temperature on closure upstream and downstream side calculate target throttle position.Engine ECU 50 is controlled to be target throttle position by the control command signal control throttle actuator 15 of based target throttle position and with throttle position.

Engine ECU 50 is determined the controlled quentity controlled variable with the motor 34 of the turbosupercharger 30 of moment of torsion basic controlling interlocking, so just can be to turbosupercharger 30 interpolation auxiliary powers when quickening and can obtain the boost pressure expected as quickly as possible.Especially, Engine ECU 50 is calculated target auxiliary power, power auxiliary timing etc. and is exported result of calculations to motor ECU 60 based on target airflow rate of calculating according to target torque and target boost pressure.Motor ECU 60 is from Engine ECU 50 received signals, carries out predetermined computing and the control power with supply motor 34 under the situation of moyor etc. considering.

Next the overview of the control of Engine ECU 50 among the embodiment will be described referring to Fig. 2.Fig. 2 is the control block diagram that shows the function of Engine ECU 50.

System shown in Fig. 2 has as the moment of torsion basic control unit 70 of major function to calculate target throttle position based on the target torque of driver's request and Auxiliary Control Element 80 calculates the auxiliary power that the motor 34 of motor ECU 60 is given in indication.Hereinafter with the details of description control unit 70 and 80.

In moment of torsion basic control unit 70, target torque computing unit 71 calculates target torque based on accelerator position and engine speed, and target airflow rate computing unit 72 based target moments of torsion and engine speed calculating target airflow rate.The target airflow rate is corresponding to the required airflow rate of target torque that realizes driver's request.Target suction pressure computing unit 73 based target airflow rates and engine speed are calculated target suction pressure (goal pressure in closure downstream side), and target boost pressure computing unit 74 based target airflow rates and engine speed are calculated target boost pressure (goal pressure of closure upstream side).The intake temperature of target throttle position computing unit 75 based target airflow rates, target suction pressure, target boost pressure, actual boost pressure and process closure is calculated target throttle position.In this case, can use target airflow rate [g/rev] to calculate target suction pressure and target boost pressure.In order to calculate target throttle position, understand the target airflow rate [g/sec] of applying unit time, the target airflow rate of unit time obtains by using motor switch target airflow rate [g/rev].

Actual boost pressure is the boost pressure (closure upstream pressure) that is detected by boost pressure sensor 12, and the intake temperature of process closure is the intake temperature by the closure upstream side of intake air temperature sensor 13 detections.

In this case, can be based on the following basic equation calculating target throttle position of calculating through the airflow rate Ga of closure.

Ga＝f(Thr)×Pb/√T×f(Pm/Pb)

In above-mentioned equation, Thr represents throttle position, and Pb represents the closure upstream pressure, and Pm represents the closure downstream pressure, and T represents intake air temperature.In an embodiment, airflow rate Ga, throttle position Thr, closure upstream pressure Pb and the closure downstream pressure Pm through closure replaces with target airflow rate, target throttle position, actual boost pressure and target suction pressure respectively in the basic equation.Target throttle position is based on calculating such as target airflow rate, actual boost pressure, target suck air pressure.

On the other hand, in Auxiliary Control Element 80, target turbine output computing unit 81 calculates the target turbine output based on target airflow rate of calculating in the moment of torsion basic control unit 70 and target boost pressure.Actual turbines power calculation unit 82 is based on exhaust information calculations actual turbines power.The difference power that difference power computing unit 83 calculates between target turbine output and the actual turbines power.Auxiliary power computing unit 84 calculates auxiliary power and exports auxiliary powers to motor ECU 60 based on the difference power that calculates.

Under this this situation, the auxiliary power of motor 34 is calculated as actual turbines power in shortage for the target turbine output.That is, the in shortage of turbine output compensated by the motor auxiliary power.Auxiliary Control Element 80 is also by calculating the motor auxiliary materials with power as unified parameter.Because the command value of the motor ECU 60 of existing electric turbine system is motor output, so wish to calculate motor auxiliary power amount.

When calculating auxiliary power, wish based on correction auxiliary power such as the performance of motor 34 and serviceability, engine operation state and upscale protection is set.In an embodiment, the CLV ceiling limit value of auxiliary power is by as parameter and by CLV ceiling limit value the upper limit of auxiliary power being protected motor temperature (checkout value of temperature transducer 35).

Hereinafter the overview of the assist control of electric turbosupercharger will be described referring to Fig. 3 A to 3D.

When accelerator position as shown in Figure 3A changed and begins to quicken, the target turbine output increases according to acceleration request and actual turbines power (exhaust power) raises after the target turbine output, shown in Fig. 3 B.Therefore, shown in Fig. 3 D, actual boost pressure can raise after the target boost pressure.In an embodiment, when turbine output is not enough, can adds auxiliary power and come auxiliary turbines power, shown in Fig. 3 C.At this moment, auxiliary power is based on (hereinafter will describe details) of the difference calculating of target turbine output and actual turbines power.That is, in this case, the auxiliary power of motor 34 is added on the power (actual turbines power) by exhaust rotary turbine machine impeller 32.By power sum (actual turbines power+auxiliary power), compressor impeller 31 is via axle 33 rotations.Therefore, shown in Fig. 3 D, boost pressure can increase very early.

In an embodiment, turbine output (target turbine output and actual turbines power) in Auxiliary Control Element 80 by electricity consumption turbine model is calculated.Hereinafter details will be described.Fig. 4 is the control block diagram that shows electric turbine model M 10.In Fig. 4, electric turbine model comprises motor 34 and is equipped with the interstage cooler 37 of turbosupercharger 30.

In Fig. 4, turbine wheel 32, axle 33, compressor impeller 31, motor 34 and interstage cooler 37 are modeled as turbine model M11, shaft model M12, compressor model M13, motor model M14 and interstage cooler model M 15 respectively.Remove the department pattern of turbosupercharger, also set the outlet pipe model M 16 of wherein considering exhaust delay etc. and wherein considered the suction tude model M 17 of intake lag etc.

In electric turbine model M 10, by using energy (power) flowed as unified parameter designing turbine model M 11, shaft model M12, compressor model M13 and motor model M14 based on the supercharging principle, thereby improved the convenience (reusability) when model is reused.In other words, model is in case design just can be applied to other system at an easy rate.By using this model as the basis, just can carry out the modeling of pressurized machine at an easy rate with highly redundant and electronization, and the model that can realize having high overall versatility.

In turbine model M11, turbine output Lt is to use equation (1) to utilize the exhaust parameter (exhaust flow velocity mg, turbine upstream pressure P tb_in, turbo machine downstream pressure Ptb_out, turbine upstream temperature T tb_in and turbo machine adiabatic efficiency η g) of the motor 10 that calculates in outlet pipe model M 16 to calculate.

$L_t=c_g{T}_{\mathrm{tb}\_\mathrm{in}}\{1-{\left(\frac{P_{\mathrm{tb}\_\mathrm{in}}}{P_{\mathrm{tb}\_\mathrm{out}}}\right)}^{\frac{{\mathrm{\κ}}_g-1}{{\mathrm{\κ}}_g}}\}{m}_g{\mathrm{\η}}_g---\left(1\right)$

Wherein cg represents the specific heat of exhaust, and κ g represents ratio of specific heat.

As temperature, pressure and the flow velocity of motor 10 exhaust parameters can be the actual measured value of sensor etc. or by the estimated value that uses a model or collection of illustrative plates obtains.As an example, in an embodiment, exhaust flow velocity mg is calculated by the actual measured value of airometer 41 and injection signal (or air fuel ratio) to get, and turbine upstream/downstream pressure Ptb and turbine upstream/downstream temperature Ttb use the preliminary table that generates to calculate by exhaust flow velocity mg to get.

In the turbine system of reality, there are many delay elements.For example, calculating in the configuration of exhaust flow velocity mg, postponing in the reflection of the measurement charge air flow speed of meeting in entering the exhaust flow velocity of turbo machine based on the actual measured value of airometer 41.Therefore, in outlet pipe model M 16, exhaust flow velocity mg is the delay element that causes in volume (the outlet pipe volume from the outlet end to the turbo machine), pressure and the engine speed of considering outlet pipe 24 etc. and calculate and get.

In motor model M14, can calculate auxiliary power Le.In the next stage, can will be input to shaft model M12 by the power Ltc that calculates turbine output Lt that gets and the auxiliary power Le addition acquisition that calculating gets in motor model M14 among the turbine model M11.

In shaft model M12, power Ltc is output by equation (2) conversion compressor horsepower Lc and compressor horsepower Lc.η t represents power conversion efficiency.

L _C＝η _tL _tc …(2)

The compressor horsepower Lc that is derived by equation (2) is transfused among the compressor model M13.

In compressor model M13, the boost pressure energy is calculated by compressor horsepower Lc and compressor efficiency η c (equation (3)) and gets.By changing equation (3), can obtain equation (4).By equation (4), can use boost pressure energy calculated value and inlet condition (charge air flow speed Ga, compressor upstream pressure (compressor incoming pressure) Pc_in and intake air temperature Tc_in) to calculate compressor downstream pressure (compressor delivery pressure) Pc_out.In equation (4), ca represents to suck the specific heat of air, and κ a represents ratio of specific heat.Charge air flow speed Ga is calculated by the testing signal of airometer 41 to get.Compressor upstream pressure Pc_in is calculated by the testing signal of atmosphere pressure sensor 44 to get.Intake air temperature Tc_in is that the testing signal from inhaled air temperature sensor (for example, be installed on the airometer temperature transducer) calculates and gets.

$L_c{\mathrm{\η}}_c=c_a{T}_{c\_\mathrm{in}}\{{\left(\frac{P_{c\_\mathrm{out}}}{P_{c\_\mathrm{in}}}\right)}^{\frac{{\mathrm{\κ}}_a-1}{{\mathrm{\κ}}_a}}-1\}{G}_a---\left(3\right)$

$P_{c\_\mathrm{out}}=P_{c\_\mathrm{in}}{(1+\frac{L_c{\mathrm{\η}}_c}{c_a{T}_{c\_\mathrm{in}}{G}_a})}^{\frac{{\mathrm{\κ}}_a}{{\mathrm{\κ}}_a-1}}---\left(4\right)$

As the airflow rate of the suction air parameter of motor 10 and calculation of pressure for wherein considering because the value of the transmission delay that the volume (suction tude extends to the volume of closure from compressor) of the suction tude 11 in the suction tude model M 17, pressure etc. cause etc.

Each efficient in the equation (1) to (3) all is by obtaining in the table of input and power (energy) or by calculating.Efficiency eta g and η c can come by using the adiabatic efficiency calculating that obtains from temperature and pressure.The efficiency eta t (referring to equation (2)) that is converted to the power of compressor horsepower Lc from power Ltc is by obtaining each adiabatic efficiency and obtaining Lc/Ltc by actual required energy of supercharging and the power Ltc of this moment when the model of cognition after this and definite.By using the inverse model method, the knowledge (gear efficiency etc.) that can need not actual turbosupercharger conversion efficiency just can generation model, and can reproduce the stationary value of actual machine by model.

Compressor efficiency η c is expressed as equation (5).

${\mathrm{\η}}_c=\frac{T_{c\_\mathrm{in}}\{{\left(\frac{P_{c\_\mathrm{out}}}{P_{c\_\mathrm{in}}}\right)}^{\frac{\mathrm{\κ}-1}{\mathrm{\κ}}}-1\}}{T_{c\_\mathrm{out}}-T_{c\_\mathrm{in}}}---\left(5\right)$

Equation (5) can be revised as following equation (6).When compressor efficiency η c, compressor upstream pressure Pc_in, compressor downstream pressure Pc_out and intake air temperature Tc_in are known, just can calculate compressor downstream temperature Tc_out by equation (6).

$T_{c\_\mathrm{out}}=T_{c\_\mathrm{in}}+\frac{T_{c\_\mathrm{in}}}{{\mathrm{\η}}_c}\{{\left(\frac{P_{c\_\mathrm{out}}}{P_{c\_\mathrm{in}}}\right)}^{\frac{\mathrm{\κ}-1}{\mathrm{\κ}}}-1\}---\left(6\right)$

By above-mentioned flow process, just can calculate compressor downstream pressure Pc_out and compressor downstream temperature Tc_out and they are input in the interstage cooler model M 15 in the ensuing stage.

Model M 15 is divided into and is used for calculating the pressure loss model part of interstage cooler 37 pressure losses and is used to calculate the cooling effect model part of cooling effect (temperature decline).Shown the configuration of previous part among Fig. 5.Shown the configuration of a back part among Fig. 6.The pressure loss and cooling effect are based on the element characteristic design of interstage cooler.The element characteristic regulation is as follows.

At first, determine as a reference external air temperature Ta_base, barometric pressure Pa_base, compressor downstream pressure Pb_base and compressor downstream temperature Tb_base.Above-mentioned value is the reference operational condition value of determining arbitrarily with rigging in the motor of turbosupercharger.Under the reference operational condition, can obtain with respect to the interstage cooler rate of influx as pressure loss Characteristic pressures loss Δ P with as the temperature slippage Δ T of cooling effect feature (temperature decline feature).Pressure loss Δ p is the poor of the incoming pressure of interstage cooler and delivery pressure.Temperature slippage Δ T is the poor of the input temp of interstage cooler and output temperature.This is a reference model.

The pressure loss in the interstage cooler 37 and cooling effect are along with incoming pressure (compressor downstream pressure Pc_out), temperature (compressor downstream temperature Tc_out), the external air temperature Ta of interstage cooler and pass the speed (being car speed) of the wind of interstage cooler 37 and change.Therefore, based on each parameter, can proofread and correct with reference to the calculated value under the condition.In this case, the pressure loss can be along with the increase of the rising of the increase of compressor downstream pressure Pc_out and compressor downstream temperature Tc_out or wind speed and is reduced.Cooling effect (temperature decline) can increase along with the increase of the rising of compressor downstream temperature Tc_out or wind speed.

In the pressure loss model shown in Fig. 5, use (for example is set to reference value by external air temperature Ta_base, compressor downstream temperature Pb_base and compressor downstream temperature Tb_base, Ta_base=25 degree centigrade, Pb_base=0 kPa, and Tb_base=75 degree centigrade) and the characteristic spectrum that generates, can calculate reference pressure loss Δ Pbase based on each charge air flow speed Ga and car speed SPD.

The compression correction factor gets by using equation (7) to calculate based on compressor downstream pressure Pc_out, and temperature correction facotor gets based on compressor downstream temperature Tc_out and external air temperature Ta calculating by using equation (8).ρ (T) is illustrated in the air density at arbitrary temp place.

$f_{\mathrm{pp}}\left(P_{c\_\mathrm{out}}\right)=\frac{P_{a\_\mathrm{base}}}{P_a+P_{c\_\mathrm{out}}}---\left(7\right)$

$f_{\mathrm{tp}}(T_{c\_\mathrm{out}},T_a)=\frac{\mathrm{\ρ}(T_{b\_\mathrm{base}}-T_{a\_\mathrm{base}})}{\mathrm{\ρ}(T_{c\_\mathrm{out}}-T_a)}---\left(8\right)$

The temperature correction of equation (8) considers the difference of external air temperature and pressurized machine temperature and carries out, and is accompanied by the variation among the external air temperature Ta and the temperature correction that occurs is included in the equation (8) and (carries out the temperature correction by equation (10) realization that hereinafter will describe similarly).

Subsequently, calculate boost pressure Pth (closure upstream pressure) by following equation (9).

P _th＝P _{c_out}-ΔP _base×f _tp(T _{c_out}，T _a)×f _pp(P _{c_out}) …(9)

In the cooling effect model shown in Fig. 6, with pressure loss model class among Fig. 5 seemingly, reference temperature slippage Δ Tbase is based on each charge air flow speed Ga and car speed SPD (for example is set to reference value by external air temperature Ta_base, compressor downstream pressure Pb_base and compressor downstream temperature Tb_base, Ta_base=25 degree centigrade, Pb_base=0 kPa, and Tb_base=75 degree centigrade) and the characteristic spectrum calculating that generates gets.

By using equation (10), can calculate temperature correction facotor based on compressor downstream temperature Tc_out and external air temperature Ta.

$f_{\mathrm{tt}}(T_{c\_\mathrm{out}},T_a)=\frac{T_{c\_\mathrm{out}}-T_a}{T_{b\_\mathrm{base}}-T_{a\_\mathrm{base}}}---\left(10\right)$

As mentioned above, even when compressor downstream pressure Pc_out changes, the mass flow rate of leading to interstage cooler 37 can not change yet, and does not so just carry out the pressure correction of cooling effect (temperature decline).

Can calculate pressurized machine temperature T th (closure upstream temperature) by equation (11).

T _th＝T _{c_out}-ΔT _base×f _tt(T _{c_out}，T _a) …(11)

So just calculate boost pressure Pth (closure upstream pressure) and pressurized machine temperature T th (closure upstream temperature) as the output of interstage cooler model M 15.

Target turbine output computing unit 81 in the Auxiliary Control Element 80 of Fig. 2 and actual turbines power calculation unit 82 are based on electric turbine model M 10 designs, and the overview of unit 81 and 82 is shown as the control block diagram of Fig. 7.Target turbine output computing unit 81 Inversion Calculation by electric turbine model M 10 (inverse model) are calculated target turbine output Lt_t, and actual turbines power calculation unit 82 is calculated actual turbines power Lt_r by the calculating (forward model) of just drilling of electric turbine model M 10.Target turbine output Lt_t is corresponding to the input of Fig. 4 axis model M 12 and be actually turbine output and auxiliary power sum (being the target power of turbosupercharger 30).

In brief, target turbine output computing unit 81 is by shaft model M12, compressor model M13 among use Fig. 4 and the inverse model of interstage cooler model M 15, target boost pressure Pth_t (target throttle upstream pressure) and target airflow rate Ga_t are set to the host computer parameter, thereby calculate target turbine output Lt_t.In this case, especially, in the interstage cooler inverse model, the collection of illustrative plates (Fig. 8) by using based on the actual machine data can calculate target boosted temperature Tth_t by based target boost pressure Pth_t.Inverse model (interstage cooler pressure loss model) by utilizing Fig. 5 and the inverse model (cooling effect model) of Fig. 6 form the inverse representation, just can based target boost pressure Pth_t (target throttle upstream pressure) and target boosted temperature Tth_t (target throttle upstream temperature) and target airflow rate Ga_t, external air temperature Ta (upstream of compressor temperature) and barometric pressure Pa (compressor upstream pressure) calculate targeted compression machine downstream pressure Pc_out_t.

In the inverse model of compressor, target pressurized machine energy Wc_t is to use following equation (12) to be got by targeted compression machine downstream pressure Pc_out_t, target airflow rate Ga_t, external air temperature Ta and barometric pressure Pa calculating.In equation, ca represents the specific heat of air, and κ a represents the ratio of specific heat of air.

$W_{c\_t}=c_a{T}_a\{{\left(\frac{P_{c\_\mathrm{out}\_t}}{P_a}\right)}^{\frac{{\mathrm{\κ}}_a-1}{{\mathrm{\κ}}_a}}-1\}{G}_{a\_t}---\left(12\right)$

In addition, compressor efficiency η c_t uses that target pressurized machine energy Wc_t gets as calculation of parameter and targeted compression acc power Lc_t calculates by following equation (13) to get by the efficient collection of illustrative plates shown in Fig. 9.

L _{c_t}＝W _{c_t}/η _{c_t} …(13)

In the inverse model of axle, targeted compression electro-mechanical force Lc_t is converted to target turbine output Lt_t by using following equation 14.η t represents power conversion efficiency.

L _{t_t}＝L _{c_t}/η _t …(14)

In target turbine output computing unit 81, can add turbo machine inertia inverse model (inverse model that first rank of turbo machine inertia lag behind).By adding turbo machine inertia inverse model, can realize that the target turbine output calculates the improvement of accuracy.

Actual turbines computing unit 82 is to calculate the actual turbines power Lt_r of exhaust with mode like the calculating order class of turbine model by outlet pipe model and turbine model (forward model).Especially, the exhaust parameter (exhaust flow velocity mg, turbine upstream pressure P tb_in, turbo machine downstream pressure Ptb_out, turbine upstream temperature T tb_in and turbo machine adiabatic efficiency η g) of the actual turbines power Lt_r motor 10 that is to use equation (1) to utilize to calculate in the outlet pipe model calculates and gets.

Difference power between the actual turbines power Lt_r of difference power computing unit 83 calculating target turbine output Lt_t and calculating as mentioned above (=Lt_t-Lt_r), and from difference power computation requests auxiliary power Wa.Can upscale protection etc. suitably be set for request auxiliary power Wa.After this, to motor ECU 60 output auxiliary power signals (motor command value).

Next, will calculate the handling process of the auxiliary power of target throttle position and Engine ECU 50 referring to the flow chart description of Figure 10 to 15 now.Figure 10 is the flow chart that shows basic routine.Routine by for example per 4 milliseconds of execution of Engine ECU 50 once.In the basic routine of Figure 10, can suitably carry out the subroutine of Figure 11 to 15.Hereinafter the flow process of process will be described according to the control block diagram of Fig. 2 basically, and with partly the repetitive description thereof will be omitted.

As shown in figure 10, basic routine comprises target throttle position calculation routine (step S100) and auxiliary power calculation routine (step S200).Figure 11 has shown the details of target throttle position calculation routine, and Figure 12 has shown the details of auxiliary power calculation routine.

In target throttle position calculation routine shown in Figure 11, at first read accelerator position checkout value (step S101).Next, calculate target torque (step S102) based on accelerator position and engine speed.Based target moment of torsion and engine speed are calculated target airflow rate (step S103), and based target airflow rate and engine speed calculating target suck air pressure (target throttle downstream pressure) and target boost pressure (target throttle upstream pressure) (step S104 and S105).At last, the intake air temperature of based target airflow rate, target suck air pressure, target boost pressure, actual boost pressure and process closure calculates target throttle position (step S106).

In auxiliary power calculation routine shown in Figure 12, at first use below the subroutine of the Figure 13 that will describe, based on the inverse model calculating target turbine output (step S210) of turbine model.Next, by using below the subroutine of the Figure 14 that will describe, calculate actual turbines power (step S220) based on the forward model of turbine model.By from the target turbine output, deducting actual turbines power, can calculate difference power (step S230).By using below the subroutine of the Figure 15 that will describe, just can determine whether that needing to carry out power assists (step S240).

Calculate in the subroutine at target turbine output shown in Figure 13, read target boost pressure and target airflow rate (step S211).Subsequently, for example,, can calculate target boosted temperature (step S212) by the based target boost pressure by using the relation of Fig. 8.After this, by using the inverse model of interstage cooler, calculate targeted compression machine downstream pressure (step S213 and S214) under the pressure loss that can be in considering interstage cooler and the situation of cooling effect.Calculate target pressurized machine energy by the inverse model that uses compressor, and the relation of Fig. 9 calculates compressor efficiency (step S215 and S216) by for example using.The targeted compression acc power is calculated by target pressurized machine energy and compressor efficiency and gets (step S217), and in addition, the target turbine output is to calculate (the step S218) that gets by the inverse model that uses axle.

Actual turbines power calculation subroutine shown in Figure 14 partly is made of outlet pipe model part and turbine model.In the outlet pipe model part, the exhaust flow velocity is to calculate (the step S221) that gets under considering the situation that takes place to postpone in the reflection of airflow rate of exhaust flow velocity in measuring as turbo machine by airometer 41.Based on the exhaust flow velocity, can calculate exhaust feature (pressure and temperature in turbine upstream/downstream side) (step S222).Turbine model partly calculates turbo machine adiabatic efficiency η g (step S223) and for example exhaust flow velocity, exhaust pressure and delivery temperature and turbo machine adiabatic efficiency η g calculate actual turbines power (step S224) based on exhaust parameter.

Next, determine in the routine that auxiliary power Wa is based on the difference power that calculates among the step S230 among Figure 12 and calculates (the step S241) that gets auxiliary shown in Figure 15.At this moment, the upscale protection based on motor feature and motor temperature can be set suitably, and calculate auxiliary power Wa.After this, just can determine that whether auxiliary power Wa is greater than predetermined value Wa_th (step S242).When Wa＞Wa_th, can assist to allow flag F a to be set to 1.When Wa＜Wa_th, can assist to allow flag F a to be set to 0 (step S243 and S244).By this operation, in the situation of Wa＞Wa_th (the auxiliary flag F a=1 that allows), it is auxiliary to carry out power by motor 34 therein.In the situation of Wa≤Wa_th (the auxiliary flag F a=0 that allows), the power that can stop motor 34 is auxiliary therein.

Figure 16 A to 16F is the time diagram that shows various actions under the situation of using assist control in an embodiment.In Figure 16 B to 16D and Figure 16 F, the conventional art that applies auxiliary power based on acceleration request when acceleration request also is shown as the object that will be compared.The behavior of using long line alternately and dotted line to show conventional art.

Shown in Figure 16 A, when accelerator position changed and begins to quicken, the desired value of moment of torsion and boost pressure can increase according to acceleration request, shown in Figure 16 B and 16C.Shown in Figure 16 E, the target turbine output increases, and actual turbines power can raise after the target turbine output.Under this this situation, can calculate between target turbine output and the actual turbines power difference power (dash area among Figure 16 E) and with it as the auxiliary power of motor 34.By carrying out assist control, actual torque and boost pressure will increase, thus the tracking target value, and the improvement of realization acceleration.After this, when actual turbines fully increased with respect to the target turbine output, auxiliary power was set to zero, and it is auxiliary to stop the power of motor 34.Throttle position is to fall after rise to stationary value.

In this case, throttle position is to be calculated by pressure ratio between target suction pressure and the actual boost pressure (=target suction pressure/actual boost pressure is corresponding to the ratio of closure downstream pressure and closure upstream pressure) and target airflow rate to get.When actual boost pressure was lower than stationary value during transition therein, pressure ratio became and is lower than stationary value.Therefore, throttle position is arranged to bigger angle and is compensated the in shortage of boost pressure, thereby improves acceleration performance (transient response).When actual boost pressure became near stationary value, throttle position converged to the value in the plateau automatically.

In traditional control, do not carry out the comparison between target turbine output and the actual turbines power etc., and auxiliary power is based on accelerator position and increases than calculating and gets.Therefore, auxiliary power is almost interlocked with acceleration request.So just can not obtain enough acceleration performance by auxiliary power, in addition, do not reduce the device of the auxiliary power relevant with the increase of boost pressure, will continue wherein to provide the state of unwanted auxiliary power substantially like this.With respect to throttle position, opening speed can be controlled, but not by shown in the long line that replaces among Figure 16 D and dotted line, overregulating throttle position to the control of raising acceleration performance.Throttle position is only interlocked with accelerator position.Therefore, the rising of moment of torsion will be slowed down, shown in the long line and dotted line that replace among Figure 16 B, and just improvement enough in the Interim can be do not obtained.In addition, the risk that also exists boost pressure to overregulate is shown in the long line and dotted line that replace among Figure 16 C.

Embodiment by as above describing in detail can obtain following good effect.

Auxiliary power is based on difference power between the actual turbines power in target turbine output and the turbosupercharger 30 and calculates and get, and the power of motor 34 is auxiliary can control by the auxiliary power that calculates.Therefore, by the auxiliary materials that is used as in shortage, just can carry out the efficient assist control of not having waste with the target turbine output.Because auxiliary power is get by relatively calculating of power, thus with use other parameter for example the boost pressure situation of calculating auxiliary power compare, can carry out more directly assist control and have higher response.Therefore, it is auxiliary for the power that axle 33 provides just can suitably to control motor 34, in addition, can improve fuel consumption, drive performance etc.

The target airflow rate calculating of the moment of torsion control (airflow rate control) that is used for motor gets because the target turbine output is based on, so can control closure 14 (airflow rate regulating device) and motor 34 (power assistance device) with interlocking, and can improve the accuracy of moment of torsion control.Therefore, the excessive of motor output etc. just can not take place and lack, and can further improve drive performance.

By making the physical model of electricity consumption turbine model M 10 as flow of power in the expression turbosupercharger 30, can calculate the target turbine output by the inverse model (inverse model of interstage cooler, compressor and axle) of turbine model, and can calculate actual turbines power by the forward model (forward model of turbo machine) of turbine model.Therefore, just can calculate target turbine output and actual turbines power, and can improve the accuracy of power assist control with high precision.

The present invention is not limited to the explanation of previous embodiment and can followingly carries out.

Though the target turbine output is based on target boost pressure and target airflow rate and calculates (referring to the Fig. 2) that gets in the aforementioned embodiment, it can also use actual airflow speed to replace target airflow rate and based target boost pressure and actual airflow rate calculations target turbine output.Especially, in this case, in the control block diagram of Fig. 2, target boost pressure and actual airflow speed are transfused in the target turbine output computing unit 81.Actual airflow speed is actually to pass the volume (airflow rate of actual compressor process) of the air of compressor impeller and can calculate based on the checkout value of airometer 41.Perhaps, actual airflow speed can be used based on the collection of illustrative plates of preliminary generations such as adapting to based on each motor operation conditions and estimate, or can be by the estimation that uses a model.

Figure 17 A to 17D is the time diagram that is presented at control behavior under the situation of using actual airflow rate calculations target turbine output.In Figure 17 B to 17D, in order to compare, the behavior (the control behavior in the previous embodiment) that has shown target turbine output, auxiliary power and throttle position under the situation of using the target airflow rate with the long line that replaces and short dash line.

Shown in Figure 17 A, the variation in the actual airflow speed lags behind the variation in the target airflow rate.Therefore, under the situation based on actual airflow rate calculations target turbine output, calculate the situation of target turbine output with the based target airflow rate and compare, the difference power between target turbine output and the actual turbines power can reduce (Figure 17 B).Therefore, auxiliary power will reduce owing to decrease, and can reduce the energy consumption (consumption of the power of battery of motor driven) of power when auxiliary.The decrease of auxiliary power is compensated by the airflow rate increase of airflow rate control, and can guarantee acceleration performance (pressurized machine feature).

In an embodiment, can calculate the target turbine output of turbosupercharger 30 and the difference power between the actual turbines power, and can calculate the motor auxiliary materials based on difference power.Configuration can change with targeted compression acc power that calculates turbosupercharger 30 and the difference power between the actual compression acc power, and can calculate the motor auxiliary materials based on difference power.

In an embodiment, auxiliary power is calculated as the auxiliary materials of motor 34 and motor 34 and is actuated to realize the auxiliary power that calculates.Perhaps, can use another kind of configuration, thereby wherein the driving that is calculated as auxiliary materials and control motor 34 of turbo machine rotational speed realizes the turbo machine rotational speed.

In an embodiment, make electricity consumption turbine model carry out the calculating of turbine output (target turbine output and actual turbines power) in the Auxiliary Control Element 80.This method can be changed into another kind of method.For example, can use collection of illustrative plates to calculate target turbine output and actual turbines power.

Though in an embodiment, the target boost pressure is based on the target airflow rate of the target torque calculating from moment of torsion basic control unit 70 and calculates (Fig. 2) that gets,, the target boost pressure also can directly be calculated by target torque.

Though in an embodiment, actual boost pressure is to obtain from the checkout value of boost pressure sensor 12, and target throttle position gets by using actual boost pressure to calculate, perhaps, can obtain actual boost pressure and calculate target throttle position by estimation by the use estimated value.Particularly, can use the turbine model described referring to Fig. 4 and the boost pressure that obtains as the output of model can be as the estimated value of actual boost pressure.

Second embodiment

Figure 18 is the overall schematic configuration diagram of engine control system.To with first embodiment in identical parts specified identical reference number and no longer be repeated in this description.The description of same operation also will no longer repeat.

In suction tude 11, auxiliary electrical compression machine 38 is provided on the upstream of compressor side of turbosupercharger 30.Suck air by the upstream side compression of auxiliary compressor 38 in turbosupercharger 30.Auxiliary compressor 38 uses motor 38a as driving source.When motor 38a by from the power source driving of battery (not shown) the time, auxiliary compressor 38 is operated.That is, be different from turbosupercharger 30, auxiliary compressor 38 uses and is different from the power source of the power of exhaust as it.

Engine ECU 50 is determined the controlled quentity controlled variable with the auxiliary compressor 38 (motor 38a) of moment of torsion basic controlling interlocking.Therefore, when vehicle quickens, can give turbosupercharger 30 auxiliary powers (auxiliary power) and obtain the boost pressure expected as quickly as possible.That is, Engine ECU 50 is calculated target auxiliary power, target power auxiliary timing etc. based on the target boost pressure that calculates according to target torque, and result of calculation is exported to motor ECU 60.Motor ECU 60 is from Engine ECU 50 received signals, carries out the power that predetermined computing and control will be supplied with the motor 38a of auxiliary compressor 38 under the situation of moyor etc. considering.

Next the overview of the control of Engine ECU 50 among second embodiment will be described referring to Figure 19.Figure 19 is the control block diagram that shows the function of Engine ECU 50.

The moment of torsion basic control unit 170 that system shown in Figure 19 has as major function calculates the auxiliary power that the auxiliary compressor 38 (motor 38a) of motor ECU 60 is given in indication based on target torque calculating target throttle position and the Auxiliary Control Element 180 that the driver asks.Hereinafter with the details of description control unit 170 and 180.

In moment of torsion basic control unit 170, target torque computing unit 171 calculates target torque based on accelerator position and engine speed, and target airflow rate computing unit 172 based target moments of torsion and engine speed calculating target airflow rate.The target airflow rate is corresponding to the required airflow rate of target torque that realizes driver's request.Target suction pressure computing unit 173 based target airflow rates and engine speed are calculated target suction pressure (goal pressure in closure downstream side), and target boost pressure computing unit 174 based target airflow rates and engine speed calculating target boost pressure (goal pressure of closure upstream side).The intake temperature of target throttle position computing unit 175 based target airflow rates, target suction pressure, target boost pressure, actual boost pressure and process closure is calculated target throttle position.In this case, can use target airflow rate [g/rev] to calculate target suction pressure and target boost pressure.In order to calculate target throttle position, understand the target airflow rate [g/sec] of applying unit time, the target airflow rate of unit time obtains by using engine speed switch target airflow rate [g/rev].

In this case, can be based on the following basic equation calculating target throttle position of calculating through the airflow rate Ga of closure.

Ga＝f(Thr)×Pb/√T×f(Pm/Pb)

In above-mentioned equation, Thr represents throttle position, and Pb represents the closure upstream pressure, and Pm represents the closure downstream pressure, and T represents intake air temperature.In a second embodiment, airflow rate Ga through closure in the basic equation replaces with the target airflow rate, throttle position Thr replaces with target throttle position, closure upstream pressure Pb replaces with actual boost pressure, closure downstream pressure Pm replaces with the target suction pressure, and target throttle position is based on, and calculating such as target airflow rate, actual boost pressure, target suck air pressure get.

On the other hand, in Auxiliary Control Element 180, target power computing unit 181 calculates the targeted compression acc power based on target airflow rate of calculating in the moment of torsion basic control unit 170 and target boost pressure.Actual power computing unit 182 is based on exhaust information calculations actual compression acc power.The difference power that difference power computing unit 183 calculates between targeted compression acc power and the actual compression acc power.

Calculation of pressure loss unit 184 calculates the pressure loss amount that suction tude for example takes place in the upstream portion such as air filter, auxiliary compressor 38 based on engine speed and actual suction pressure.At this moment, pressure loss amount is that the calculating of the relation shown in Figure 20 gets by for example using.In Figure 20, actual suction pressure or engine speed are high more, and the pressure loss amount of being calculated is just big more.Actual suction pressure is by air inlet pressure sensor 17 detected suction pressures (closure downstream pressure).

Targeted compression machine upstream pressure computing unit 185 is based on calculating targeted compression machine upstream pressure by the difference power of difference power computing unit 183 calculating and the pressure loss amount of being calculated by Calculation of pressure loss unit 184.Targeted compression machine upstream pressure is in the goal pressure of the ingress of the compressor impeller 31 of turbosupercharger 30 (targeted compression machine incoming pressure) and is that the calculating of the relation shown in Figure 21 gets by for example using.In Figure 21, difference power is big more, and the targeted compression machine upstream pressure that is calculated is just big more.Pressure loss amount is big more, and the targeted compression machine upstream pressure that is calculated is just low more.

Auxiliary power computing unit 186 is based on the targeted compression machine upstream pressure that calculates and exhaust power calculation auxiliary power and to motor ECU 60 output auxiliary powers (motor command value).In this case, auxiliary power is that the calculating of the relation shown in Figure 22 gets by for example using.In Figure 22, targeted compression machine upstream pressure is high more or exhaust power is high more, and the auxiliary power that is calculated is just high more.Exhaust power is based on the exhaust feature, and for example exhaust flow velocity, exhaust pressure and delivery temperature are calculated and are got.

Under this this situation, the auxiliary power of auxiliary compressor 38 is calculated as actual compression acc power in shortage for the targeted compression acc power.That is the auxiliary compensation of the compressor horsepower power by auxiliary compressor 38 in shortage.Auxiliary Control Element 180 is also by calculating auxiliary materials with power as unified parameter.Because the command value of the motor ECU 60 of turbine system is motor output, so wish to calculate the auxiliary power amount.

When calculating auxiliary power, wish based on correction auxiliary power such as the performance of motor 38a and serviceability, engine operation state and upscale protection is set.In a second embodiment, the CLV ceiling limit value of auxiliary power is by as parameter and by CLV ceiling limit value the upper limit of auxiliary power being protected motor temperature.

In an embodiment, compressor horsepower (targeted compression acc power and actual compression acc power) gets by using the turbine model to calculate in Auxiliary Control Element 180.Hereinafter details will be described.Figure 23 is the control block diagram that shows turbine model M 10.In Figure 23, the turbine model also comprises the interstage cooler 37 that is equipped with turbosupercharger 30.

In Figure 23, turbine wheel 32, axle 33, compressor impeller 31 and interstage cooler 37 are modeled as turbine model M11, shaft model M12, compressor model M13 and interstage cooler model M 15 respectively.Remove the department pattern of turbosupercharger, also set the outlet pipe model M 16 of wherein considering delay such as exhaust and wherein considered the suction tude model M 17 of delays such as air inlet.

In turbine model M10, by use energy (power) based on the supercharging principle mobile as unified parameter designing turbine model M11, shaft model M12 and compressor model M13, thereby improved convenience (reusability) when reuse model.In other words, model is design in a single day, just can be applied at an easy rate in another system.Based on model, just can carry out the modeling of pressurized machine at an easy rate with highly redundant and electronization, and the model that can realize having high overall versatility.

Target power computing unit 181 in the Auxiliary Control Element 180 of Figure 19 and actual power computing unit 182 are based on 10 designs of turbine model M, and the overview of unit 181 and 182 is shown as the control block diagram among Figure 24.Target power computing unit 181 calculates targeted compression acc power Lc_t by the Inversion Calculation (inverse model) of turbine model M 10, and actual power computing unit 182 calculates actual compression acc power Lc_r by the calculating (forward model) of just drilling of turbine model M 10.

In brief, target power computing unit 181 is by the inverse model of compressor model M13 and interstage cooler model M 15 among use Figure 23, and, can calculate targeted compression acc power Lc_t by using target boost pressure Pth_t (target throttle upstream pressure) and target airflow rate Ga_t as the host computer parameter.In this case, especially, in the interstage cooler inverse model, the collection of illustrative plates (Fig. 8) by using based on the actual machine data can calculate target boosted temperature Tth_t by based target boost pressure Pth_t.Inverse model (interstage cooler pressure loss model) by utilizing Fig. 5 and the inverse model (cooling effect model) of Fig. 6 form the inverse representation, just can based target boost pressure Pth_t (target throttle upstream pressure) and target boosted temperature Tth_t (target throttle upstream temperature) and target airflow rate Ga_t, external air temperature Ta (upstream of compressor temperature) and barometric pressure Pa (compressor upstream pressure) calculate targeted compression machine downstream pressure Pc_out_t.

Actual power computing unit 182 is to calculate the actual compression acc power Lc_r of exhaust with mode like the calculating order class of turbine model by outlet pipe model, turbine model (forward model) and shaft model (forward model).That is, the exhaust parameter (exhaust flow velocity mg, turbine upstream pressure P tb_in, turbo machine downstream pressure Ptb_out, turbine upstream temperature T tb_in and turbo machine adiabatic efficiency η g) of the actual turbines power Lt_r motor 10 that is to use equation (1) to utilize to calculate in the outlet pipe model calculates and gets.In addition, multiply each other, can calculate actual compression acc power Lc_r by making actual turbines power Lt_r and power conversion efficiency η t.

Difference power between the actual compression acc power Lc_r of difference power computing unit 183 calculating targeted compression acc power Lc_t and calculating as mentioned above (=Lc_t-Lc_r).In the auxiliary power computing unit 186 (referring to Figure 19) of targeted compression machine upstream pressure computing unit 185 and last stages,, can calculate targeted compression machine upstream pressure and request auxiliary power based on difference power.After this, to motor ECU 60 output auxiliary power signals (motor command value).

Now will be referring to the handling process of flow chart description Engine ECU 50 execution.

In the auxiliary power calculation routine shown in Figure 25, at first based on the subroutine call by using below the Figure 26 that will describe to the inverse model of turbine model calculate targeted compression acc power (step S1210).Next, by using below the subroutine of the Figure 27 that will describe, calculate actual compression acc power (step S1220) based on the forward model of turbine model.By from the targeted compression acc power, deducting the actual compression acc power, can calculate difference power (step S1230).By using below the subroutine of the Figure 28 that will describe, just can determine whether that needing to carry out power assists (step S1240).

Calculate in the subroutine at targeted compression acc power shown in Figure 26, read target boost pressure and target airflow rate (step S1211).Subsequently, for example,, can calculate target boosted temperature (step S1212) by the based target boost pressure by using the relation of Fig. 8.After this, by using the inverse model of interstage cooler, calculate targeted compression machine downstream pressure (step S1213 and S1214) under the pressure loss that can be in considering interstage cooler and the situation of cooling effect.Calculate target pressurized machine energy by the inverse model that uses compressor, and the relation of Fig. 9 calculates compressor efficiency (step S1215 and S1216) by for example using.Calculate targeted compression acc power (step S1217) by target pressurized machine energy and compressor efficiency.

Actual compressor power calculation subroutine shown in Figure 27 partly is made of outlet pipe model part, turbine model part and shaft model.In the outlet pipe model part, the exhaust flow velocity is to calculate (the step S1221) that gets under the situation of the reflection delay of the airflow rate of considering the exhaust flow velocity that is entered turbo machine by airometer 41 measurement conducts.Based on the exhaust flow velocity, can calculate exhaust feature (pressure and temperature in turbine upstream/downstream side) (step S1222).Turbine model partly calculates turbo machine adiabatic efficiency η g (step S1223) and for example exhaust flow velocity, exhaust pressure and delivery temperature and turbo machine adiabatic efficiency η g calculate actual turbines power (step S1224) based on exhaust parameter.In addition, the shaft model part calculates actual compression acc power (step S1225) based on actual turbines power and power conversion efficiency.

Next, determine in the routine, calculate the pressure loss amount (step S1241) that for example takes place in the air filter in the suction tude upstream portion by using relation among Figure 20 for example auxiliary shown in Figure 28.Subsequently, by using the relation among Figure 21 for example to calculate targeted compression machine upstream pressure (step S1242) based on the deviation (difference power) and the pressure loss amount of compressor horsepower.Calculate auxiliary power Wa (step S1243) by using concern based target compressor upstream pressure and exhaust power meter among Figure 25 for example.In addition, can upscale protection (step S1244) based on motor feature and motor temperature suitably be set for auxiliary power Wa.

After this, just can determine that whether auxiliary power Wa is greater than predetermined value Wa_th (step S1245).When Wa＞Wa_th, can assist to allow flag F a to be set to 1.When Wa≤Wa_th, can assist to allow flag F a to be set to 0 (step S1246 and S1247).By this operation, in the situation of Wa＞Wa_th (the auxiliary flag F a=1 that allows), it is auxiliary to carry out power by the motor 38a of auxiliary compressor 38 therein.In the situation of Wa≤Wa_th (the auxiliary flag F a=0 that allows), the power that can stop motor 38a is auxiliary therein.

Figure 29 A to 29F has shown the time diagram of various actions under the situation of using assist control in a second embodiment.

Shown in Figure 29 A, when accelerator position changed and begins to quicken, target torque can increase according to acceleration request, and matches with this increase, and the target boost pressure can increase, as shown in Figure 29 B.Shown in Figure 29 C, the targeted compression acc power increases, and the actual compression acc power can raise after the targeted compression acc power.Under this this situation, can calculate the difference power between targeted compression acc power and the actual compression acc power, shown in Figure 29 D.Based on this difference power, can calculate the auxiliary power of auxiliary compressor 38 (motor 38a), as shown in Figure 29 E.By carrying out assist control, boost pressure will increase, thus the tracking target value, as shown in Figure 29 F, and the improvement of realization acceleration performance.Simultaneously, just can obtain the target torque of driver's request reliably.After this, when the actual compression acc power increased fully with respect to the targeted compression acc power, auxiliary power was set to zero.In Figure 29 F, shown the behavior that does not provide actual boost pressure in the auxiliary situation of power therein by a dotted line.Should be appreciated that the increase in the actual boost pressure lags behind a lot.

As shown in Figure 29 F,, as far as possible promptly follow desired value and when boost pressure increases, reach reference pressure (barometric pressure) until it thereby actual boost pressure all can increase no matter emergent power is auxiliary.After this, boost pressure increases than whether power is auxiliary is changed according to existing to a great extent.

Embodiment by as above describing in detail can obtain following good effect.

Auxiliary power is based on the difference power between the targeted compression acc power and actual compression acc power in the turbosupercharger 30 and calculates and get, and the power of auxiliary compressor 38 (motor 38a) is auxiliary can control by the auxiliary power that calculates.Therefore, by the auxiliary materials that is used as in shortage, just can carry out the efficient assist control of not having waste with the targeted compression acc power.Because auxiliary power is get by relatively calculating of power, thus with use other parameter for example the boost pressure situation of calculating auxiliary power compare, can carry out more directly assist control and have higher response.Therefore, the power that just can suitably be controlled at the auxiliary compressor 38 that sets on the upstream of compressor side of turbosupercharger 30 is auxiliary, in addition, can improve fuel consumption, drive performance etc.

Particularly, targeted compression machine upstream pressure (goal pressure between auxiliary compressor 38 and the compressor impeller 31) is based on difference power between targeted compression acc power and the actual compression acc power and calculates and to get, and targeted compression machine upstream pressure that auxiliary power is based on calculating calculates and to get, and so just the upstream pressure (compressor incoming pressure) of compressor impeller 31 can be controlled to be the pressure that is adapted to difference power.Therefore, just can realize can be excessive or not enough suitable power auxiliary.

The target airflow rate calculating of the moment of torsion control (airflow rate control) that is used for motor gets because the target turbine output is based on, so can control closure 14 (airflow rate regulating device) and auxiliary compressor 38 (additional mechanical supercharging device) with interlocking, and can improve the accuracy of moment of torsion control.Therefore, can prevent that motor output from becoming excessive or not enough and drive performance etc. can further be provided.

By making the physical model of electricity consumption turbine model M 10 as flow of power in the expression turbosupercharger 30, just can use the inverse model (inverse model of interstage cooler and compressor) of turbine model to calculate the targeted compression acc power, and can calculate the actual compression acc power by the forward model (forward model of turbo machine and axle) of turbine model.Therefore, just can calculate targeted compression acc power and actual compression acc power, and can improve the accuracy of power assist control with high precision.

By using the auxiliary compressor 38 separate with turbosupercharger 30 as the additional mechanical supercharging device, do not need existing turbine system is carried out a large amount of changes or transformation, just can design preferred power additional mechanical supercharging system.

The present invention is not limited to embodiment's explanation and can followingly carries out.

Though in a second embodiment, auxiliary compressor 38 (additional mechanical supercharging device) is provided in the upstream of compressor side of turbosupercharger 30 in the suction tude 11, but replace this configuration, auxiliary compressor (additional mechanical supercharging device) can be provided on the compressor downstream side of turbosupercharger 30.In this case, targeted compression machine downstream pressure (goal pressure of compressor outlet side) is based on difference power between targeted compression acc power and the actual compression acc power and calculates and to get, and auxiliary power is based on targeted compression machine downstream pressure and calculates and get.Therefore, the downstream pressure (compressor delivery pressure) of compressor impeller 31 can be controlled to be the pressure that adapts to difference power, and can realize exceeding or not enough suitable power auxiliary.

In an embodiment, can calculate the targeted compression acc power of turbosupercharger 30 and the difference power between the actual compression acc power, and can calculate the motor auxiliary materials based on this difference power.Configuration can change with target turbine output that calculates turbosupercharger 30 and the difference power between the actual turbines power, and can calculate the motor auxiliary materials based on difference power.

In an embodiment, auxiliary power calculates the auxiliary materials as auxiliary compressor 38, and auxiliary compressor 38 (motor 38a) is actuated to realize auxiliary power.Perhaps, can use a kind of configuration, wherein the compressor rotational speed calculate as auxiliary materials and control auxiliary compressor 38 (motor 38a) thus driving realize the compressor rotational speed.

In an embodiment, use the turbine model to carry out the calculating of compressor horsepower (targeted compression acc power and actual compression acc power) in the Auxiliary Control Element 180.This method can be changed into another kind of method.For example, can use collection of illustrative plates to calculate targeted compression acc power and actual compression acc power.

Though in aforementioned second embodiment, the target boost pressure is based on the target airflow rate of the target torque calculating from moment of torsion basic control unit 170 and calculates (Figure 19) that gets,, the target boost pressure also can directly be calculated by target torque.

Though in an embodiment, actual boost pressure is to obtain from the checkout value of boost pressure sensor 12, and target throttle position gets by using actual boost pressure to calculate, interchangeable is to obtain actual boost pressure and to calculate target throttle position by the use estimated value by estimation.Particularly, can use the turbine model described referring to Figure 23 and the boost pressure that obtains as the output of model can be as the estimated value of actual boost pressure.

Replace the configuration that difference power calculates targeted compression machine upstream pressure (goal pressure between auxiliary compressor 38 and the compressor impeller 31) between based target compressor horsepower and the actual compression acc power, can use configuration based on calculating targeted compression machine upstream pressures such as motor operation conditionss.Auxiliary power is based on targeted compression machine upstream pressure and calculates and to get.In this case, use measurement actual compressor upstream pressures such as sensor, and can carry out feedback control, measured value will become targeted compression machine upstream pressure like this.Use this configuration, just compressor upstream pressure can be controlled to be desired pressure.Therefore, just can realize can be excessive or not enough suitable power auxiliary.

Use this configuration, when calculating auxiliary power, pressure loss amount (in the pressure loss amount of suction tude upstream portion generation) and exhaust power can be added as calculating parameter.

By the comparison between actual boost pressure and the predetermined reference pressure, can determine the auxiliary timing of auxiliary compressor 38.Especially, can determine whether actual boost pressure has reached predetermined reference pressure.Before whether definite actual boost pressure had reached reference power, the power that can stop auxiliary compressor 38 was auxiliary." reference pressure " is barometric pressure for example.That is, when boost pressure raises,, follow desired value and reach reference pressure (barometric pressure) until it thereby actual boost pressure all can raise rapidly no matter whether exist power auxiliary.After this, boost pressure increases than whether power is auxiliary is changed according to existing to a great extent.Therefore, we can say that required power is not auxiliary substantially reaches reference pressure (barometric pressure) until actual boost pressure.Therefore, power is auxiliary to reach aforesaid reference pressure until actual boost pressure by stopping, and just can reduce the auxiliary energy consumption of power.

The 3rd embodiment

Figure 30 is the overall schematic configuration diagram of engine control system.

In motor shown in Figure 30 210, piston 212 is contained in the cylinder block 211, and firing chamber 214 is defined by cylinder inner wall, piston 212 and cylinder head 213.In cylinder head 213, be furnished with automatically controlled Fuelinjection nozzle 215.Fuel under high pressure is fed to Fuelinjection nozzle 215 from rail 216 altogether, and the opening operation of fuel by Fuelinjection nozzle 215 is ejected in the firing chamber 214.Though show, system has the fuel pressure that is used for fuel tank and is transported to petrolift in the common rail 216.The petrolift fuel discharge amount is based on the pressure (fuel pressure) in the common rail of detections such as sensor and controls.

For suction port has been arranged intake valve 217, and arranged exhaust valve 218 for relief opening.Suction tude 221 is connected on the suction port, and interstage cooler 237 is arranged in the upstream side of baffle-box 222 in the suction tude 221.For baffle-box 222, set the air inlet pressure sensor 223 that is used to detect suction press (also being the boost pressure of turbosupercharger described later).Outlet pipe 224 is connected on the relief opening.

Turbosupercharger 230 is arranged between suction tude 221 and the outlet pipe 224.Turbosupercharger 230 has and sets the compressor impeller 231 that is used for suction tude 221 and set the turbine wheel 232 that is used for outlet pipe 224.Compressor impeller 231 and turbine wheel 232 are connected on the axle 233.Axle 233 is equipped with motor (motor) 234 as power assistance device.Motor 234 passes through from the power operation of battery (not shown) supply and the rotation of auxiliary axis 233.Motor 234 is equipped with temperature transducer 235 and detects motor temperature.

In turbosupercharger 230, turbine wheel 232 is deflated the exhaust rotation of flowing in the pipe 224.Rotating force is delivered on the compressor impeller 231 via axle 233.By compressor impeller 231, the suction air that flows in suction tude 221 is compressed and carries out supercharging.The air of supercharging is cooled off by interstage cooler 237 in turbosupercharger 230, and after this, side is supplied with cooling air downstream.By using interstage cooler 237 coolings to suck air, can improve the charging efficiency that sucks air.

The air filter of Xian Shiing is not provided in the topmost part of suction tude 221.On the downstream side of air filter, the airometer 225 and the closure driven by stepper motors 226 that are used to detect charge air flow speed have been set.In addition, control system have a plurality of sensors for example crank angle sensor 227 be used to export at the rectangle crank angle signal at each predetermined degree in crank angle place (for example, every 30 degrees centigrade) of motor 210 rotations, path increment (accelerator position) and the atmosphere pressure sensor 229 that accelerator position sensor 228 is used to detect accelerator pedal and be used to detect barometric pressure.

In outlet pipe 224, set the catalyst-assembly 241 that wherein has the NOx absorbing agent on the turbo machine downstream side of turbosupercharger 230.In addition, EGR path 242 is provided between the downstream of catalyst-assembly 241 in the upstream of compressor side of turbosupercharger 230 in the suction tude 221 and the outlet pipe 224.Mid point in EGR path 242 is furnished with EGR interstage cooler 243 and EGR control valve 244 driven by stepper motors by cooling EGR gases such as engine cooling waters.

As known, Engine ECU (ECU (Electrical Control Unit)) the 250th constitutes as the main body that comprises CPU, ROM and RAM by using microcomputer.Be stored in last various director demons among the ROM by execution, Engine ECU 250 can be carried out various controls on the motor 210 according to engine operation state.Especially, multiple testing signal is from above-mentioned each sensor input Engine ECU 250.Engine ECU 250 is based on each testing signal computing fuel emitted dose of importing, closure controlled quentity controlled variable, EGR controlled quentity controlled variable, fuel pressure controlled quentity controlled variable etc., and based on the amount of calculating, the driving of control Fuelinjection nozzle 215, closure 226, EGR control valve 244, petrolift etc.

In an embodiment, control is carried out so-called moment of torsion basic controlling as a reference fuel injection amount is controlled to be desired value by the moment of torsion that uses generation in the motor 210 to fuel injection amount.Briefly, Engine ECU 250 is calculated target torque (required torque) based on the testing signal of accelerator position sensor 228, the target fuel injection amount of target torque is satisfied in calculating, and the control command of response based target fuel injection amount is controlled the driving of Fuelinjection nozzle 215.

Engine ECU 250 is determined the controlled quentity controlled variable with the motor 234 of the turbosupercharger 230 of moment of torsion basic controlling interlocking, so just can be to turbosupercharger 230 interpolation auxiliary powers when quickening and can obtain the boost pressure expected as quickly as possible.Especially, Engine ECU 250 is calculated target auxiliary power, power auxiliary timing etc. and is exported result of calculations to motor ECU 260 based on target fuel injection amount of calculating according to target torque and target boost pressure.Motor ECU 260 is from Engine ECU 250 received signals, carries out predetermined computing and the control power with supply motor 234 under the situation of moyor etc. considering.

Next the overview of the control of Engine ECU 250 among the embodiment will be described referring to Figure 31.Figure 31 is the control block diagram that shows the function of Engine ECU 250.

The moment of torsion basic control unit 270 that system shown in Figure 31 has as major function calculates the auxiliary power that the motor 234 of motor ECU 260 is given in indication based on target torque calculating target fuel injection amount and the Auxiliary Control Element 280 that the driver asks.Hereinafter with the details of description control unit 270 and 280.

In moment of torsion basic control unit 270, target torque computing unit 271 calculates target torque based on accelerator position and engine speed, and target fuel injection amount computing unit 272 based target moments of torsion and engine speed calculating target fuel injection amount.Target fuel injection amount is corresponding to the required fuel quantity of target torque of realizing driver's request.Final injection quantity computation unit 273 based target fuel injection amounts and the final emitted dose of actual intake air calculation of pressure.In this case, can smoke evacuation protection (being used for being provided with the CLV ceiling limit value of permissible range cigarette growing amount) be set based on actual intake air pressure etc.By the smoke evacuation protection, can protect the upper limit of target fuel injection amount, and determine final fuel injection amount.Actual intake air pressure is high more, and the smoke evacuation protection is provided with greatly more.By the setting of smoke evacuation protection, can realize target torque and suppress the generation of cigarette simultaneously.Actual suction pressure is by air inlet pressure sensor 223 detected suction pressures (by the boost pressure of turbosupercharger generation).

Target boost pressure computing unit 274 based target fuel injection amounts and engine speed are calculated the target boost pressure.

On the other hand, in Auxiliary Control Element 280, target turbine output computing unit 281 calculates the target turbine output based on the target airflow rate of calculating with by the target boost pressure of moment of torsion basic control unit 270 calculating from figure etc.The target airflow rate is to get based on being calculated by the airflow rate of airometer 225 actual measurements according to the target boost pressure.Replace collection of illustrative plates to calculate, also can calculate the target airflow rate by estimation by using a model.Actual turbines power calculation unit 282 is based on exhaust information calculations actual turbines power.The difference power that difference power computing unit 283 calculates between target turbine output and the actual turbines power.Auxiliary power computing unit 284 calculates auxiliary power and exports auxiliary powers to motor ECU 260 based on the difference power that calculates.

Under this this situation, the auxiliary power of motor 234 is calculated as actual turbines power in shortage for the target turbine output.That is, the in shortage of turbine output compensated by the motor auxiliary power.In Auxiliary Control Element 280, also by using power to go out the motor auxiliary materials as unified calculation of parameter.Because the command value of the motor ECU 260 of existing electric turbine system is motor output, so wish to calculate motor auxiliary power amount.

When calculating auxiliary power, wish based on correction auxiliary power such as the performance of motor 234 and serviceability, engine operation state or upscale protection is set.In an embodiment, the CLV ceiling limit value of auxiliary power is by as parameter and by CLV ceiling limit value the upper limit of auxiliary power being protected motor temperature (checkout value of temperature transducer 235).

Target turbine output Lt_t that 283 calculating of difference power computing unit are calculated as mentioned above and the difference power between the actual turbines power Lt_r (difference power=Lt_t-Lt_r), and by difference power computation requests auxiliary power Wa.Meetings such as upscale protection, EGR proofread and correct are suitably carried out on request auxiliary power Wa.After this, to motor ECU 260 output auxiliary power signals (motor command value).

The computing flow process of Engine ECU 250 will be described now.To no longer repeat with the explanation of processing identical among first embodiment and second embodiment.

Shown in figure 32, basic routine has fuel injection amount calculation routine (step S2100) and auxiliary power calculation routine (step S2200).Figure 33 has shown the details of fuel injection amount calculation routine.

In fuel injection amount calculation routine shown in Figure 33, at first read the checkout value (step S2101) of acceleration position and calculate target torque (step S2102) based on accelerator position and engine speed.Based target moment of torsion and engine speed calculate target fuel injection amount (step S2103) and based target fuel injection amount and engine speed and calculate target boost pressure (step S2104).After this, based on actual suction pressure (actual boost pressure), fuel pressure and other motor operation conditions smoke evacuation protection (step S2105) is set.At last, by using the smoke evacuation protection, calculate final emitted dose (step S2106) as CLV ceiling limit value.

Figure 34 A to 34F is the time diagram that shows various actions under the situation of using assist control in an embodiment.

Shown in Figure 34 A, when accelerator position changed and begins to quicken, target torque increased according to acceleration request, shown in Figure 34 B.Match with increase, target fuel injection amount can increase, shown in Figure 34 D.At this moment, the target boost pressure can increase, shown in Figure 34 C.Actual fuel injection quantities (smoke evacuation protection) when regulating according to the variation in the actual boost pressure changes.The target turbine output increases, and shown in Figure 34 E, and actual turbines power can increase after the target turbine output increases.Under this this situation, can calculate between target turbine output and the actual turbines power difference power (dash area among Figure 34 E) and with it as the auxiliary power of motor 234.By carrying out assist control in this mode, actual torque and boost pressure will increase, thus the tracking target value, and the improvement of realization acceleration performance.After this, when actual turbines power fully increased with respect to the target turbine output, auxiliary power was set to zero, and it is auxiliary to stop the power of motor 234.At this moment, the difference power between target turbine output and the actual turbines power is with regard to vanishing or very little.In the state that required power is not assisted substantially, will suppress the auxiliary execution of power therein.

In the embodiment who as above describes in detail, can obtain following good effect.

By power controlling is auxiliary as mentioned above, the response that can improve actual boost pressure.Therefore, the adjusting (smoke evacuation protection) of the fuel injection amount of carrying out based on actual boost pressure can be relaxed, and the fuel that is used for acceleration request etc. can be increased.Therefore, when providing acceleration request, can obtain good booster response.

The configuration of the Engine torque control of carrying out based on the target fuel injection amount of calculating from target torque (fuel injection amount control), similar with target fuel injection amount, the target turbine output is based on the target airflow rate calculated from target torque and calculates and get.Therefore, can control Fuelinjection nozzle 215 (fuel injection system) and motor 234 (power assistance device) with interlocking, and improve the accuracy of moment of torsion control.Therefore, can prevent that motor output from becoming excessive or not enough and drive performance etc. can further be provided.

Claims (29)

1. controller that is used to have the internal-combustion engine of pressurized machine, described controller is applied to internal-combustion engine (10), described internal-combustion engine (10) comprises and being used for by exhaust power pressurized machine (30) that sucks supercharging air and the power assistance device (34) that is installed in the power of the last and direct hydraulic booster (30) of pressurized machine (30), described controller comprising by by airflow rate regulating device (14) adjusting that sucks the air quantity in the internal-combustion engine (10) being come the output torque of controlling combustion engine (10):

Target power computing device (50) based on the target power of airflow rate information calculations pressurized machine (30);

Calculate the actual power computing device (50) of the actual power of pressurized machine (30);

Auxiliary materials computing device (50) based on the auxiliary materials of the target power of pressurized machine (30) and actual power rated output auxiliary device (34); And

Sub controlling unit (60) by the auxiliary materials power controlling auxiliary device (34) that calculates.

2. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 1 is characterized in that, also comprises:

According to the device (50) that calculates the target airflow rate corresponding to the target torque of driver's request; And

Carry out the device (50) that airflow rate is controlled by airflow rate regulating device (14) based on the target airflow rate of calculating,

Wherein target power computing device (50) based target airflow rate is calculated the target power of pressurized machine (30).

3. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 1 is characterized in that, also comprises:

Based on the device (50) that calculates the target airflow rate corresponding to the target torque of driver's request:

Carry out the device (50) that airflow rate is controlled by airflow rate regulating device (14) based on the target airflow rate of calculating, and

When carrying out airflow rate control, airflow rate regulating device (14) obtains sucking the device (50) of the actual volume of the air of actual flow in the air path (11) by estimation or measurement,

Wherein target power computing device (50) is based on the target power of actual airflow rate calculations pressurized machine (30).

4. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 2 is characterized in that, also comprises the device of based target torque arithmetic target boost pressure,

Wherein target power computing device (50) also calculates the target power of pressurized machine (30) based on airflow rate information and target boost pressure except that calculating parameter.

5. controller that is used to have the internal-combustion engine of pressurized machine, be applied to internal-combustion engine (10), described internal-combustion engine (10) has by exhaust power to the pressurized machine (30) that sucks supercharging air be installed in that pressurized machine (30) is gone up and the power assistance device (34) of the power of direct hydraulic booster (30), and described controller comprises:

Calculate the target power computing device (50) of the target power of pressurized machine (30) based on the serviceability of internal-combustion engine (10);

Calculate the actual power computing device (50) of the actual power of pressurized machine (30);

Auxiliary materials computing device (50) based on the auxiliary materials of the target power of pressurized machine (30) and actual power rated output auxiliary device (34); And

Sub controlling unit (60) by the auxiliary materials power controlling auxiliary device (34) that calculates.

6. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 1 is characterized in that, also comprises by estimation or measures the device (50) of the exhaust parameter that obtains internal-combustion engine (10) exhaust,

Wherein actual power computing device (50) calculates the actual power of pressurized machine (30) based on exhaust parameter.

7. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 1, described controller is applied to internal-combustion engine, (10), described internal-combustion engine, (10) use the turbine wheel that has by the rotation of exhaust power, (32) turbosupercharger, (30) with via axle, (33) be connected to compressor impeller on the turbine wheel, (31), described axle, (33) be equipped with motor, (34) as power assistance device, (34), and internal-combustion engine, (10) pass through by compressor impeller, (31) rotation is compressed and is sucked air execution supercharging

Wherein use the turbine model (M10) of the parts of turbosupercharger (30), the flowing of the power of described turbine model representation from turbine wheel (32) to compressor impeller (31),

Actual power computing device (50) calculates the actual power of pressurized machine (30) by the turbine model (M11) of using turbine wheel in the turbine model at least, and

Target power computing device (50) calculates the target power of pressurized machine (30) by the compressor model (M13) that uses compressor wheels (31) in the turbine model at least.

8. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 7, it is characterized in that, actual power computing device (50) by use exhaust information as input parameter with utilize turbine model (M10) before drill the actual power of calculating pressurized machine (30), and target power computing device (50) utilizes the Inversion Calculation of turbine model (M10) to calculate the target power of pressurized machine (30) by use boost pressure information and air inlet information as input parameter.

9. be used to have pressurized machine controller of internal-combustion engine of (30), be applied to internal-combustion engine (10), described internal-combustion engine (10) has by exhaust power to the pressurized machine (30) that sucks supercharging air with in the upstream of pressurized machine (30) or the downstream is that set and additional mechanical supercharging device (38) that operate as power source with the power that is different from exhaust, described controller is by coming the output torque of controlling combustion engine (10) by airflow rate regulating device (14) to the adjusting of the volume of the air that sucks internal-combustion engine (10), and described controller comprises:

Calculate the target power computing device (50) of the target power of pressurized machine (30) based on the charge air flow rate information of internal-combustion engine (10);

Calculate the actual power computing device (50) of the actual power of pressurized machine (30);

Calculate the auxiliary materials computing device (50) of the auxiliary materials of additional mechanical supercharging device (38) based on the target power of pressurized machine (30) and actual power; And

Control the sub controlling unit (60) of additional mechanical supercharging device (38) by the auxiliary materials of calculating.

10. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9 is characterized in that, also comprises:

Based on the device (50) that calculates the target airflow rate corresponding to the target torque of driver's request; And

Carry out the device (50) that airflow rate is controlled by airflow rate regulating device (14) based on the target airflow rate of calculating,

Wherein target power computing device (50) based target airflow rate is calculated the target power of pressurized machine (30).

11. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 10 is characterized in that, also comprises:

The based target airflow rate is calculated the device (50) of target boost pressure; And

Based target airflow rate and calculate the device (50) of the target power of pressurized machine (30) as the target boost pressure that calculating parameter adds.

12. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9, it is characterized in that, auxiliary materials computing device (50) comprises the device (50) that calculates goal pressure in the air inlet path of extending based on the target power of pressurized machine (30) and the difference power between the actual power between pressurized machine (30) and additional mechanical supercharging device (38), and based on the device (50) of the auxiliary materials of the goal pressure calculating additional mechanical supercharging device (38) that calculates.

13. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 12 is characterized in that goal pressure is high more, auxiliary materials computing device (50) will increase the auxiliary materials of additional mechanical supercharging device (38) more.

14. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 12 is characterized in that, also comprises the device (50) of the pressure loss amount of calculating the upstream that occurs in the pressurized machine (30) in the air inlet path (11),

Auxiliary materials computing device (50) based target pressure and calculate the auxiliary materials of additional mechanical supercharging device (38) as the pressure loss amount that calculating parameter adds wherein.

15. be used to have pressurized machine controller of internal-combustion engine of (30), be applied to internal-combustion engine (10), described internal-combustion engine (10) has by exhaust power to the pressurized machine (30) that sucks supercharging air with in the upstream of pressurized machine (30) or the downstream is that set and additional mechanical supercharging device (38) that operate as power source with the power that is different from exhaust, and described controller comprises:

Calculate the target power computing device (50) of the target power of pressurized machine (30) based on the serviceability of internal-combustion engine (10);

Calculate the actual power computing device (50) of the actual power of pressurized machine (30);

Calculate the auxiliary materials computing device (50) of the auxiliary materials of additional mechanical supercharging device (38) based on the target power of pressurized machine (30) and actual power; And

Control the sub controlling unit (60) of additional mechanical supercharging device (38) by the auxiliary materials of calculating.

16. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9 is characterized in that, also comprises:

By estimation or measure to calculate the device (50) of exhaust parameter of the exhaust of internal-combustion engine (10),

Wherein actual power computing device (50) calculates the actual power of pressurized machine (30) based on exhaust parameter.

17. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9, controller is applied to internal-combustion engine (10), described internal-combustion engine (10) uses to have by the turbosupercharger (30) of the turbine wheel (32) of exhaust power rotation with via axle (33) and is connected to compressor impeller (31) on the turbine wheel (32), and compress the suction air by the rotation of compressor impeller (31) and carry out supercharging

Wherein use the turbine model (M10) of the parts of turbosupercharger (30), the flowing of the power of described turbine model representation from the turbine wheel to the compressor impeller,

The actual power of turbine model (M11) the computing device pressurized machine (30) of actual power computing device (50) by in the turbine model, using turbine wheel at least, and

Target power computing device (50) calculates the target power of pressurized machine (30) by the compressor model (M13) that uses compressor wheels in the turbine model at least.

18. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 17, it is characterized in that, actual power computing device (50) by use exhaust information as input parameter with utilize turbine model (M10) before drill the actual power of calculating pressurized machine (30), and target power computing device (50) calculates the target power of pressurized machine (30) as input parameter with the Inversion Calculation of utilizing turbine model (M10) by use boost pressure information and air inlet information.

19. be used to have pressurized machine controller of internal-combustion engine of (30), be applied to internal-combustion engine (10), described internal-combustion engine (10) has that the upstream of pressurized machine (30) or downstream set to the pressurized machine (30) that sucks supercharging air with in the air inlet path and the additional mechanical supercharging device (38) operated as power source with the power that is different from exhaust by exhaust power, described controller is by coming the output torque of controlling combustion engine (10) by airflow rate regulating device (14) to the adjusting of the volume of the air that sucks internal-combustion engine (10), and described controller comprises:

The goal pressure computing device (50) of the goal pressure in the air inlet path that calculating is extended between pressurized machine (30) and additional mechanical supercharging device (38);

Calculate the auxiliary materials computing device (50) of the auxiliary materials of additional mechanical supercharging device (38) based on the goal pressure of calculating; And

Control the sub controlling unit (60) of additional mechanical supercharging device (38) by the auxiliary materials of calculating.

20. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 19, it is characterized in that, goal pressure computing device (50) calculates goal pressure based on the serviceability of internal-combustion engine (10), and goal pressure is high more, and auxiliary materials computing device (50) will increase the auxiliary materials of additional mechanical supercharging device (38) big more.

21. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9 is characterized in that, additional mechanical supercharging device (38) is to compress the auxiliary compressor (38) that sucks air as power source by the power (38a) that use is different from exhaust.

22. be used to the to have pressurized machine controller of internal-combustion engine of (30) as claimed in claim 9 is characterized in that also comprise determining whether actual boost pressure reaches the device (50) of predetermined reference pressure,

The power that wherein stopped additional mechanical supercharging device (38) before definite actual boost pressure has reached reference pressure is auxiliary.

23. controller that is used to have the internal-combustion engine of pressurized machine, be applied to internal-combustion engine (210), described internal-combustion engine (210) has by exhaust power pressurized machine (230) that sucks supercharging air and the power assistance device (234) that is installed in the power of the last and direct hydraulic booster (230) of pressurized machine (230), described controller is by the output torque of the fuel injection amount controlling combustion engine (210) in the fuel metering injection apparatus (215), and described controller comprises:

Calculate the target power computing device (250) of the target power of pressurized machine (230);

Calculate the actual power computing device (250) of the actual power of pressurized machine (230);

Auxiliary materials computing device (250) based on the auxiliary materials of the target power of pressurized machine (230) and actual power rated output auxiliary device (234); And

Sub controlling unit (260) by the auxiliary materials power controlling auxiliary device (234) that calculates.

24. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 23 is characterized in that, also comprises:

Based on the device (250) that calculates target fuel injection amount corresponding to the target torque of driver's request; And

Carry out the device (250) that fuel injection amount is controlled based on the target fuel injection amount of calculating by fuel injection system (215),

Wherein target power computing device (250) based target fuel injection amount calculates the target power of pressurized machine (230).

25. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 24 is characterized in that, comprises that also the based target fuel injection amount calculates the device (250) of target boost pressure,

Wherein target power computing device (250) calculates the target power of pressurized machine (230) based on target boost pressure that is calculated by the serviceability of internal-combustion engine (210) and target airflow rate.

26. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 23 is characterized in that, also comprises by estimation or measures the device (250) of the exhaust parameter that obtains internal-combustion engine (210) exhaust,

Wherein actual power computing device (250) calculates the actual power of pressurized machine (230) based on exhaust parameter.

27. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 23, described controller is applied to internal-combustion engine, (210), described internal-combustion engine, (210) use the turbine wheel that has by the rotation of exhaust power, (232) turbosupercharger, (230) with via axle, (233) be connected to compressor impeller on the turbine wheel, (231), described axle is equipped with motor, (234) as power assistance device, (234), and internal-combustion engine, (210) pass through compressor impeller, (231) rotation is compressed the suction air and is carried out supercharging

Wherein use the turbine model of the parts of turbosupercharger, the flowing of the power of described turbine model representation from the turbine wheel to the compressor impeller,

The actual power computing device calculates the actual power of pressurized machine (230) by the turbine model of using turbine wheel (232) in the turbine model at least, and

Target power computing device (250) calculates the target power of pressurized machine (230) by the compressor model that uses compressor impeller (231) in the turbine model at least.

28. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 27, it is characterized in that, actual power computing device (250) by use exhaust information as input parameter with utilize the turbine model before drill the actual power of calculating pressurized machine (230), and target power computing device (250) calculates the target power of pressurized machine (230) by use boost pressure information and air inlet information with the Inversion Calculation of utilizing the turbine model as input parameter.

29. the controller that is used to have the internal-combustion engine of pressurized machine as claimed in claim 23, it is characterized in that, also comprise the actual boost pressure fuel metering injection apparatus (215) regulated based on pressurized machine (230) thus fuel injection amount reduce the device (250) of the quantity of the cigarette that comprises in the exhaust of internal-combustion engine (210).

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