JP2006242063A - Control device for internal combustion engine with supercharger - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To properly control an auxiliary supercharging device neither too much nor too little and implement a highly accurate supercharging pressure control, in an internal combustion engine having a supercharger performing supercharge by exhaust power and the auxiliary supercharging device using power other than the exhaust power as a driving source. <P>SOLUTION: In a torque base control part 70, target torque is calculated based on accelerator opening and an engine speed, and a target air volume, target intake pressure, target supercharging pressure are calculated based on the target torque, and target throttle opening is calculated based on them. In the assist control part 80, target compressor power is calculated based on the target air volume and the target supercharging pressure calculated by the torque base control part 70, and actual compressor power is calculated based on exhaust information. Assist power of the auxiliary compressor disposed upstream a turbocharger is calculated based on difference between the target compressor power and the actual compressor power. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention is applied to an internal combustion engine including a supercharger such as a turbocharger, and relates to a control device for suitably controlling assist power for the supercharger.

  A turbocharger is generally known as a supercharger that supercharges intake air using exhaust power. In recent years, various technical improvements have been made in order to improve the supercharging response, and as one of them, as an auxiliary supercharging device on the upstream side or the downstream side of the turbocharger in the intake passage. A technique provided with an auxiliary compressor is disclosed (see, for example, Patent Document 1). In such a case, the auxiliary compressor is operated by an electric motor, for example.

However, Patent Document 1 and other prior arts do not disclose any control method such as how to control the auxiliary compressor. Therefore, it has been difficult to properly operate the auxiliary compressor with a control amount that is not excessive or insufficient. In this case, for example, in the configuration in which the auxiliary compressor is operated by the electric motor, the amount of power generated by the alternator or the like increases when the auxiliary compressor is operated unnecessarily, and as a result, fuel consumption may be deteriorated. Further, if the operation amount of the auxiliary compressor is insufficient, the supercharging performance (acceleration performance) intended by the driver during acceleration or the like cannot be obtained, and drivability may be deteriorated.
JP 2002-21573 A

  In an internal combustion engine including a supercharger that performs supercharging by exhaust power and an auxiliary supercharger that uses a power source other than exhaust power, the auxiliary supercharger is appropriately controlled without excess or deficiency, and thus high The main object of the present invention is to provide a control device for an internal combustion engine with a supercharger capable of realizing accurate supercharging pressure control.

  The control device of the present invention includes a supercharger that supercharges intake air by exhaust power, and an auxiliary supercharger that is provided upstream or downstream of the supercharger in the intake passage and is operated using power other than exhaust as a power source. In the internal combustion engine, the output torque of the internal combustion engine is controlled by adjusting the intake air amount by the air amount adjusting means. In particular, the target power of the supercharger is calculated based on the information on the intake air amount of the internal combustion engine, and the actual power of the supercharger (actual supercharger power) is calculated. Further, an assisting amount by the auxiliary supercharging device is calculated based on the target power and the actual power, and the auxiliary supercharging device is controlled by the calculated assisting amount. For example, the assist power may be calculated based on the power difference by comparing the target power with the actual power.

  In short, by comparing the target power of the turbocharger with the actual power, it is possible to grasp how much power is insufficient as the originally required supercharger power, and the amount of assistance corresponding to the shortage is increased. The feeding device can be driven. For example, the difference between the target power and the actual power is obtained, and the auxiliary supercharging device is driven by the assist amount calculated based on the power difference. In such a case, since the shortage with respect to the target power is used as the assist amount, the supercharger power can be assisted efficiently without waste. Further, since the assist amount is calculated by comparing the power, it is possible to perform assist control that is more direct and excellent in responsiveness than the case where the assist amount is calculated using other parameters such as supercharging pressure. For example, the behavior of the supercharging pressure is a result of the assist control. When the assist control is performed based on the behavior, a delay occurs in the control, but such inconvenience can be solved. As described above, it is possible to appropriately control the auxiliary supercharging device without excess or deficiency, and thus to realize highly accurate supercharging pressure control.

  The auxiliary supercharging device may be an auxiliary compressor that compresses intake air using power other than exhaust as a power source.

  Further, as a torque control method for an internal combustion engine, a target air amount is calculated based on a target torque corresponding to a driver's request, and air by an air amount adjusting means (such as a throttle valve) is calculated based on the calculated target air amount. There is a method of performing quantity control. In such a case, it is preferable to calculate the target power of the supercharger based on the target air amount. Thereby, the air amount adjusting means and the auxiliary supercharging device are controlled in cooperation, and the accuracy of air amount control (torque control) is improved. Therefore, further improvement in drivability and the like is possible.

  The power of the supercharger is preferably controlled according to the amount of air and the supercharging pressure each time. Therefore, the target supercharging pressure is calculated based on the target air amount, and the target power of the supercharger is calculated based on the target air amount and the target supercharging pressure. Thereby, the control accuracy of the supercharging pressure is improved.

  A target pressure in the intake passage between the supercharger and the auxiliary supercharger is calculated based on the power difference between the target power of the supercharger and the actual power, and the auxiliary supercharger is based on the calculated target pressure It is preferable to calculate the amount of assist. In this case, in particular, the assist amount by the auxiliary supercharging device is preferably increased as the target pressure is increased.

  According to this configuration, the pressure in the intake passage between the supercharger and the auxiliary supercharger (that is, when the auxiliary supercharger is on the upstream side of the supercharger, the supercharger upstream pressure, the auxiliary supercharger). If the device is downstream of the turbocharger, the downstream pressure of the turbocharger) can be controlled to a pressure that matches the power difference between the target power of the turbocharger and the actual power. Assist can be realized.

  Further, pressure loss due to an air cleaner or the like occurs upstream of the supercharger in the intake passage, and the supercharging pressure due to the supercharger is considered to be affected by the pressure loss. Therefore, it is preferable to add the pressure loss amount to the calculation parameter and calculate the assist amount by the auxiliary supercharging device based on the target pressure and the pressure loss amount. Thereby, the precision of assist control improves. Note that the pressure loss amount may vary depending on the operating state of the internal combustion engine. Therefore, the pressure loss amount may be calculated based on the operating state of the internal combustion engine such as the pressure in the intake passage and the engine speed.

  On the other hand, the present invention does not necessarily require torque control by adjusting the intake air amount. In this case, as described above, it is assumed that the present invention is applied to an internal combustion engine having a supercharger and an auxiliary supercharger provided upstream or downstream of the supercharger in the intake passage. The target power of the supercharger is calculated on the basis of the operating state, and the actual power of the supercharger is calculated. Further, an assisting amount is calculated by the auxiliary supercharging device based on the target power and actual power of the supercharger, and the auxiliary supercharging device is controlled by the calculated assisting amount. For example, the assist power may be calculated based on the power difference by comparing the target power with the actual power.

  In this configuration as well (as in the case where the torque control by the air amount is a requirement), the supercharger power can be assisted efficiently without waste by using the shortage with respect to the target power as the assist amount. . Further, since the assist amount is calculated by comparing the power, it is possible to perform assist control that is more direct and excellent in responsiveness than the case where the assist amount is calculated using other parameters such as supercharging pressure. As a result, it is possible to appropriately control the power assist by the auxiliary supercharging device, thereby improving the fuel consumption and the drivability.

  The actual supercharger power varies depending on the state of exhaust discharged from the internal combustion engine. Therefore, it is preferable to obtain exhaust parameters such as exhaust flow rate, exhaust pressure, and exhaust temperature by estimation or measurement, and calculate the actual power of the supercharger based on the exhaust parameters. Thereby, the actual motive power of a supercharger can be calculated | required appropriately.

  In a configuration using a turbocharger including a turbine wheel, a shaft, and a compressor impeller as a supercharger, the power flow from the turbine wheel to the compressor impeller can be modeled for each turbocharger component and represented as a turbo model. In this case, the actual power of the turbocharger is calculated by a turbine model that models at least the turbine wheel of the turbo model, and the target power of the turbocharger is calculated by a compressor model that models at least the compressor impeller of the turbo model. calculate. As a result, the actual power and the target power can be calculated with high accuracy.

  Incidentally, by constructing a turbo model based on the power flow and using the power as a unified parameter, for example, convenience (reusability) when reusing the model can be improved. This makes it easy to apply a once constructed model to other systems.

  Here, in particular, the actual power of the turbocharger is calculated by calculating the forward direction of the turbo model using the exhaust information as an input parameter, and the excess power is calculated by calculating the reverse direction of the turbo model using the supercharging pressure information and the intake air information as input parameters. It is good to calculate the target power of the feeder.

  Further, the present invention may require the following means. That is, a means for calculating a target pressure in the intake passage between the supercharger and the auxiliary supercharger, a means for calculating an amount to be assisted by the auxiliary supercharger based on the calculated target pressure, and the calculation And a means for controlling the auxiliary supercharging device according to the assist amount.

  According to this configuration, the pressure in the intake passage between the supercharger and the auxiliary supercharger (that is, when the auxiliary supercharger is on the upstream side of the supercharger, the supercharger upstream pressure, the auxiliary supercharger). If the device is downstream of the supercharger, the supercharger downstream pressure) can be controlled to the desired pressure. As a result, it is possible to realize appropriate power assist without excess or deficiency.

  In this case, in particular, it is preferable to calculate the target pressure based on the operating state of the internal combustion engine, and to increase the assist amount by the auxiliary supercharger as the target pressure increases.

  In addition, the amount of pressure loss generated upstream of the turbocharger in the intake passage is calculated, and the calculated pressure loss amount is added to a calculation parameter, and the auxiliary supercharging device is based on the target pressure and the pressure loss amount. The assist amount may be calculated.

  Further, it is determined whether or not the actual supercharging pressure has reached a predetermined reference pressure. The power assist by the auxiliary supercharging device may be stopped before it is determined that the actual supercharging pressure has reached the reference pressure. The “reference pressure” is, for example, atmospheric pressure. In other words, when the boost pressure rises, the actual boost pressure rises quickly following the target value regardless of the presence or absence of power assist until it reaches the reference pressure (atmospheric pressure). Accordingly, there is a large difference in the rate of increase of the supercharging pressure. Therefore, it can be said that the power assist is substantially unnecessary until the actual supercharging pressure reaches the reference pressure (atmospheric pressure). Therefore, by stopping the power assist until the actual supercharging pressure reaches the reference pressure as described above, energy consumption due to the power assist can be reduced.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings. In this embodiment, an engine control system is constructed for an in-vehicle multi-cylinder gasoline engine that is an internal combustion engine. The engine of the control system is provided with a turbocharger as a supercharger. An auxiliary compressor as an auxiliary supercharger is provided on the upstream side. First, an overall schematic configuration diagram of the engine control system will be described with reference to FIG.

  In the engine 10 shown in FIG. 1, the intake pipe 11 is provided with a throttle valve 14 as an air amount adjusting means whose opening is adjusted by a throttle actuator 15 such as a DC motor. The throttle actuator 15 incorporates a throttle opening sensor for detecting the throttle opening. An upstream side of the throttle valve 14 is provided with a boost pressure sensor 12 for detecting the pressure upstream of the throttle (a boost pressure by a turbocharger described later), and an intake air temperature sensor 13 for detecting the intake air temperature upstream of the throttle. It has been.

  A surge tank 16 is provided on the downstream side of the throttle valve 14, and the surge tank 16 is provided with an intake pressure sensor 17 (intake pipe pressure detecting means) for detecting the intake pressure on the downstream side of the throttle. The surge tank 16 is connected to an intake manifold 18 that introduces air into each cylinder of the engine 10. In the intake manifold 18, an electromagnetically driven fuel injection that injects fuel near the intake port of each cylinder. A valve 19 is attached.

  An intake valve 21 and an exhaust valve 22 are respectively provided in the intake port and the exhaust port of the engine 10, and an air / fuel mixture is introduced into the combustion chamber 23 by the opening operation of the intake valve 21, and the exhaust valve 22. By the opening operation, the exhaust gas after combustion is discharged to the exhaust pipe 24. A spark plug 25 is attached to the cylinder head of the engine 10 for each cylinder, and a high voltage is applied to the spark plug 25 at a desired ignition timing through an ignition device (not shown) including an ignition coil. By applying this high voltage, a spark discharge is generated between the opposing electrodes of each spark plug 25, and the air-fuel mixture introduced into the combustion chamber 23 is ignited and used for combustion.

  A crank angle sensor 26 that outputs a rectangular crank angle signal is attached to the cylinder block of the engine 10 at every predetermined crank angle (for example, at a cycle of 30 ° CA) as the engine 10 rotates.

  A turbocharger 30 is disposed between the intake pipe 11 and the exhaust pipe 24. The turbocharger 30 has a compressor impeller 31 provided in the intake pipe 11 and a turbine wheel 32 provided in the exhaust pipe 24, and these are connected by a shaft 33. In the turbocharger 30, the turbine wheel 32 is rotated by the exhaust gas flowing through the exhaust pipe 24, and the rotational force is transmitted to the compressor impeller 31 via the shaft 33. The intake air flowing through the intake pipe 11 is compressed by the compressor impeller 31 to perform supercharging. The air supercharged by the turbocharger 30 is cooled by the intercooler 37 and then fed downstream. As the intake air is cooled by the intercooler 37, the charging efficiency of the intake air is increased.

  An electric auxiliary compressor 38 is provided upstream of the compressor of the turbocharger 30 in the intake pipe 11, and the intake air is compressed upstream of the turbocharger 30 by the auxiliary compressor 38. Yes. The auxiliary compressor 38 uses a motor 38a as a drive source, and the auxiliary compressor 38 is operated by driving the motor 38a with power supplied from a battery (not shown). That is, unlike the turbocharger 30, the auxiliary compressor 38 uses power other than exhaust as a power source.

  An air cleaner (not shown) is provided at the most upstream portion of the intake pipe 11, and an air flow meter 41 for detecting the intake air amount is provided downstream of the air cleaner. In addition, the present control system is provided with an accelerator opening sensor 43 that detects an accelerator pedal depression amount (accelerator opening) and an atmospheric pressure sensor 44 that detects atmospheric pressure.

  As is well known, the engine ECU (electronic control unit) 50 is mainly composed of a microcomputer composed of a CPU, ROM, RAM, etc., and executes various control programs stored in the ROM, so that the engine operating state in each case. Various controls of the engine 10 are performed according to the above. That is, detection signals are input to the engine ECU 50 from the various sensors described above. The engine ECU 50 calculates the fuel injection amount, ignition timing, and the like based on various detection signals that are input as needed, and controls the drive of the fuel injection valve 19 and the spark plug 25.

  In this embodiment, electronic throttle control by so-called torque base control is performed, and the throttle opening is controlled to a target value based on the torque generated in the engine 10. Briefly, the engine ECU 50 calculates a target torque (requested torque) based on a detection signal of the accelerator opening sensor 43 and calculates a target air amount that satisfies the target torque. The target throttle opening is calculated based on the upstream and downstream pressures and the intake air temperature. The engine ECU 50 controls the throttle actuator 15 with a control command signal based on the target throttle opening, and controls the throttle opening to the target throttle opening.

  Further, the engine ECU 50 determines the control amount of the auxiliary compressor 38 (motor 38a) in conjunction with the torque base control. Thereby, assist power (auxiliary power) is added to the turbocharger 30 during vehicle acceleration so that a desired supercharging pressure can be obtained quickly. That is, the engine ECU 50 calculates target assist power, power assist timing, and the like based on the target boost pressure calculated according to the target torque, and outputs the calculation results to the motor ECU 60. The motor ECU 60 receives a signal from the engine ECU 50, performs a predetermined calculation process in consideration of motor efficiency and the like, and controls power supplied to the motor 38a of the auxiliary compressor 38.

  Next, an outline of the control of the engine ECU 50 in the present embodiment will be described with reference to FIG. FIG. 2 is a control block diagram for explaining the function of engine ECU 50.

  In the present system shown in FIG. 2, the main functions are a torque base control unit 70 that calculates the target throttle opening based on the target torque requested by the driver, and an auxiliary compressor 38 (motor 38 a) that commands the motor ECU 60. An assist control unit 80 for calculating assist power. Hereinafter, the details of the control units 70 and 80 will be described.

  In the torque base controller 70, a target torque calculator 71 calculates a target torque based on the accelerator opening and the engine speed, and a target air amount calculator 72 calculates a target based on the target torque and the engine speed. Calculate the air volume. This target air amount corresponds to the air amount required for realizing the target torque required by the driver. The target intake pressure calculation unit 73 calculates a target intake pressure (target throttle downstream pressure) based on the target air amount and the engine speed, and the target boost pressure calculation unit 74 calculates the target air amount. And the target boost pressure (target throttle upstream pressure) is calculated based on the engine speed. Then, the target throttle opening calculation unit 75 calculates the target throttle opening based on the target air amount, the target intake pressure, the target boost pressure, the actual boost pressure, and the throttle passage intake air temperature. However, in this case, the target air amount [g / rev] is used for calculating the target intake pressure and the target supercharging pressure, and the target air amount [g / rev] is calculated based on the engine speed for calculating the target throttle opening. The converted target air amount [g / sec] per unit time is used.

  The actual supercharging pressure is the supercharging pressure (throttle upstream pressure) detected by the supercharging pressure sensor 12, and the throttle passing intake air temperature is the intake air temperature upstream of the throttle detected by the intake air temperature sensor 13. .

  In such a case, the target throttle opening is calculated based on the following basic formula for calculating the throttle passing air amount Ga.

Ga = f (Thr) × Pb / √T × f (Pm / Pb)
In the above equation, Thr is the throttle opening, Pb is the throttle upstream pressure, Pm is the throttle downstream pressure, and T is the intake air temperature. In the present embodiment, the basic type throttle passing air amount Ga is set as the target air amount, the throttle opening degree Thr is set as the target throttle opening degree, the throttle upstream pressure Pb is set as the actual boost pressure, and the throttle downstream pressure Pm is set as the target suction level. The target throttle opening is calculated based on the target air amount, the actual boost pressure, the target intake pressure, and the like.

  On the other hand, in the assist controller 80, the target power calculator 81 calculates the target compressor power based on the target air amount and the target boost pressure calculated by the torque base controller 70. In addition, the actual power calculation unit 82 calculates actual compressor power (actual compressor power) based on the exhaust information. The power difference calculation unit 83 calculates a power difference between the target compressor power and the actual compressor power.

  Further, the pressure loss calculation unit 84 calculates the amount of pressure loss generated in the upstream portion of the intake pipe such as the air cleaner or the auxiliary compressor 38 based on the engine speed and the actual intake pressure. At this time, for example, the pressure loss amount is calculated using the relationship shown in FIG. 3, and according to FIG. 3, the pressure loss amount is calculated as a larger value as the actual intake pressure increases or the engine speed increases. The actual intake pressure is the intake pressure (throttle downstream pressure) detected by the intake pressure sensor 17.

  The target compressor upstream pressure calculation unit 85 calculates a target compressor upstream pressure based on the power difference calculated by the power difference calculation unit 83 and the pressure loss amount calculated by the pressure loss calculation unit 84. This target compressor upstream pressure is a target pressure (target compressor inlet pressure) at the inlet of the compressor impeller 31 of the turbocharger 30 and is calculated using the relationship shown in FIG. 4, for example. According to FIG. 4, the target compressor upstream pressure is calculated as a larger value as the power difference is larger, and the target compressor upstream pressure is calculated as a smaller value as the pressure loss amount is larger.

  Then, the assist power calculation unit 86 calculates assist power based on the calculated target compressor upstream pressure and exhaust power, and outputs the assist power (motor command value) to the motor ECU 60. At this time, for example, the assist power is calculated using the relationship shown in FIG. 5, and according to FIG. 5, the assist power is calculated as a larger value as the target compressor upstream pressure is larger or the exhaust power is larger. The exhaust power is calculated based on exhaust characteristics such as exhaust flow rate, exhaust pressure, and exhaust temperature.

  In such a case, the assist power of the auxiliary compressor 38 is calculated as a shortage of the actual compressor power with respect to the target compressor power. That is, the shortage of compressor power is compensated by the power assist of the auxiliary compressor 38. In the assist control unit 80, the assist amount is also calculated by the power using the power as a unified parameter. At this time, since the command value of the motor ECU 60 of the turbo system is a motor output, it is considered desirable to calculate the assist amount with power.

  When calculating the assist power, it is desirable to correct the assist power or set an upper limit guard based on the performance and operating state of the motor 38a, the engine operating state, and the like. In the present embodiment, the upper limit value of the assist power is set using the motor temperature as a parameter, and the upper limit value of the assist power is guarded by the upper limit value.

  By the way, in this embodiment, calculation of compressor power (target compressor power, actual compressor power) in the assist control unit 80 is performed using a turbo model, and details thereof will be described below. FIG. 6 is a control block diagram showing the turbo model M10. In FIG. 6, the intercooler 37 provided along with the turbocharger 30 is also a turbo model.

  In FIG. 6, the turbine wheel 32, the shaft 33, the compressor impeller 31, and the intercooler 37 are modeled as a turbine model M11, a shaft model M12, a compressor model M13, and an intercooler model M15, respectively. In addition, an exhaust pipe model M16 in consideration of exhaust delay and the like and an intake pipe model M17 in consideration of intake delay and the like are provided.

  Incidentally, in this turbo model M10, in the turbine model M11, the shaft model M12, and the compressor model M13, a model is constructed based on the principle of supercharging with the flow of energy (power) as a unified parameter. Convenience (reusability) when reusing is improved. That is, the model once constructed can be easily applied to other systems. Moreover, if this model is used as a base, it is possible to realize a highly versatile model because of its high redundancy and easy modeling of an electrified supercharger.

  In the turbine model M11, equation (1) is used from the exhaust parameters (exhaust flow rate mg, turbine upstream pressure Ptb_in, turbine downstream pressure Ptb_out, turbine upstream temperature Ttb_in, turbine adiabatic efficiency ηg) calculated in the exhaust pipe model M16. Then, the turbine power Lt is calculated.

式（１）で求めたタービン動力Ｌtが次のシャフトモデルＭ１２の入力とされる。ここで、ｃgは排気の比熱、κgは比熱比である。

The turbine power Lt obtained by the equation (1) is used as an input of the next shaft model M12. Here, cg is the specific heat of the exhaust, and κg is the specific heat ratio.

  The temperature, pressure, and flow rate that are the exhaust parameters of the engine 10 may be measured values by a sensor or the like or estimated values by a model or a map. As an example, in the present embodiment, the exhaust flow rate mg is calculated from the actually measured value of the air flow meter 41 and the injection signal (or air-fuel ratio), and the turbine upstream / downstream pressure is calculated from the exhaust flow rate mg using a table prepared in advance. It is assumed that Ptb and turbine upstream / downstream temperature Ttb are calculated.

  In an actual turbo system, there are many delay elements. For example, in a configuration in which the exhaust flow rate mg is calculated based on the actual measurement value of the air flow meter 41, the actual exhaust system is reflected in the exhaust flow rate in the turbine from the time of measuring the intake air amount. A delay occurs. For this reason, in the exhaust pipe model M16, the exhaust flow rate mg is calculated in consideration of the volume of the exhaust pipe 24 (exhaust pipe volume from the exhaust port to the turbine), the pressure, the delay factor caused by the engine speed, and the like.

  In the shaft model M12, the turbine power Lt is converted into the compressor power Lc according to the equation (2) and output. ηt is power conversion efficiency.

式（２）で求めたコンプレッサ動力ＬcがコンプレッサモデルＭ１３の入力とされる。

The compressor power Lc obtained by Expression (2) is used as an input to the compressor model M13.

  In the compressor model M13, supercharging energy is calculated from the compressor power Lc and the compressor efficiency ηc (formula (3)). Further, the equation (4) is obtained by modifying the equation (3), and the calculated value of the supercharging energy and the intake air parameters (intake air amount Ga, compressor upstream pressure (inlet pressure) Pc_in, intake air temperature Tc_in) are used. Compressor downstream pressure (outlet pressure) Pc_out is calculated (formula (4)). Here, ca is the specific heat of the intake air, and κa is the specific heat ratio. The intake air amount Ga is detected from the detection signal of the air flow meter 41, the compressor upstream pressure Pc_in is detected from the detection signal of the atmospheric pressure sensor 44, and the intake air temperature Tc_in is determined from the detection signal of the intake air temperature sensor (for example, a temperature sensor attached to the air flow meter). Calculated.

なお、エンジン１０の吸気パラメータである空気量や圧力は、吸気管モデルＭ１７において、吸気管１１の体積（コンプレッサからスロットルまでの吸気管体積）や圧力等に起因する輸送遅れ等を考慮した値として算出されるようになっている。

Note that the air amount and pressure, which are the intake parameters of the engine 10, are values that take into account the transport delay caused by the volume of the intake pipe 11 (the intake pipe volume from the compressor to the throttle), the pressure, etc. in the intake pipe model M17. It is calculated.

  The efficiencies used in the above equations (1) to (3) can be obtained from a table or calculation for input power (energy). The efficiency ηg and ηc can be obtained using the adiabatic efficiency obtained from the temperature and pressure. The turbine power Lt → the power conversion efficiency ηt of the compressor power Lc (see equation (2)) is obtained from the energy required for supercharging and the turbine power Lt at that time when the model is identified after obtaining each adiabatic efficiency. Lc / Lt is determined from the above. By using this inverse model method, it is possible to construct a model without knowing the actual turbocharger conversion efficiency (mechanical efficiency, etc.), and to reproduce the steady state value of the actual machine.

  Here, the compressor efficiency ηc is expressed as shown in Equation (5).

式（５）は、次の式（６）のように変形でき、コンプレッサ効率ηc、コンプレッサ上流圧力Ｐc＿in、コンプレッサ下流圧Ｐc＿out、吸気温Ｔc＿inが既知であれば、式（６）からコンプレッサ下流温Ｔc＿outが算出できる。

Equation (5) can be transformed into the following equation (6). If compressor efficiency ηc, compressor upstream pressure Pc_in, compressor downstream pressure Pc_out, and intake air temperature Tc_in are known, compressor downstream temperature Tc_out can be obtained from equation (6). Can be calculated.

以上の流れにより、コンプレッサ下流圧Ｐc＿out及びコンプレッサ下流温Ｔc＿outが算出され、これらＰc＿out及びＴc＿outが次のインタークーラモデルＭ１５の入力とされる。

From the above flow, the compressor downstream pressure Pc_out and the compressor downstream temperature Tc_out are calculated, and these Pc_out and Tc_out are input to the next intercooler model M15.

  The intercooler model M15 is divided into a pressure loss model portion for calculating the pressure loss in the intercooler 37 and a cooling effect model portion for calculating the cooling effect (temperature drop). The former configuration is shown in FIG. The configuration is shown in FIG. The pressure loss and cooling effect are built based on the characteristics of the intercooler, and the characteristics of the single unit are specified as follows.

  First, the reference outside air temperature Ta_base, atmospheric pressure Pa_base, compressor downstream pressure Pb_base, and compressor downstream temperature Tb_base are determined. These values are standard operating condition values arbitrarily determined for the turbocharged engine in constructing the model. Under this standard operating condition, a pressure loss ΔP as a pressure loss characteristic with respect to the intercooler inflow amount and a temperature drop amount ΔT as a cooling effect characteristic (temperature drop characteristic) are obtained. The pressure loss ΔP is the difference between the intercooler inlet pressure and the outlet pressure, and the temperature drop ΔT is the difference between the intercooler inlet temperature and the outlet temperature. This is the reference model.

  Here, the pressure loss and the cooling effect in the intercooler 37 include the pressure at the intercooler inlet (compressor downstream pressure Pc_out), the temperature (compressor downstream temperature Tc_out), the outside air temperature Ta, and the wind speed passing through the intercooler 37 (that is, the vehicle speed). As a parameter. Therefore, corrections are made to the calculated values under the reference conditions based on these parameters. In this case, the pressure loss decreases as the compressor downstream pressure Pc_out or the compressor downstream temperature Tc_out increases or the wind speed increases. Further, the cooling effect (temperature drop) increases as the compressor downstream temperature Tc_out increases or the wind speed increases.

  In the pressure loss model shown in FIG. 7, a characteristic map created using the outside air temperature Ta_base, the compressor downstream pressure Pb_base, and the compressor downstream temperature Tb_base as reference values (for example, Ta_base = 25 ° C., Pb_base = 0 kPa, Tb_base = 75 ° C.) A reference pressure loss ΔPbase is calculated based on the intake air amount Ga and the vehicle speed SPD each time.

  In addition, the pressure correction coefficient is calculated based on the compressor downstream pressure Pc_out using Expression (7), and the temperature correction coefficient is calculated based on the compressor downstream temperature Tc_out and the outside air temperature Ta using Expression (8). ρ (T) is the density of air at an arbitrary temperature.

なお、式（８）による温度補正は外気温と過給温の差の影響を考慮して行われ、外気温Ｔaの変化に伴う温度補正は式（８）に含まれている（後述する式（１０）による温度補正も同様）。

The temperature correction according to the equation (8) is performed in consideration of the influence of the difference between the outside air temperature and the supercharging temperature, and the temperature correction associated with the change in the outside air temperature Ta is included in the equation (8) (an expression described later). The same applies to the temperature correction by (10)).

  Then, the supercharging pressure Pth (throttle upstream pressure) is calculated by the following equation (9).

また、図８に示す冷却効果モデルでは、前記図７の圧力損失モデルと同様、外気温Ｔa＿base、コンプレッサ下流圧Ｐb＿base及びコンプレッサ下流温Ｔb＿baseを基準値（例えば、Ｔa＿base＝２５℃、Ｐb＿base＝０ｋＰａ、Ｔb＿base＝７５℃）として作成した特性マップを用い、その都度の吸入空気量Ｇaと車速ＳＰＤとに基づいて基準温度降下量ΔＴbaseを算出する。

In the cooling effect model shown in FIG. 8, as in the pressure loss model of FIG. 7, the outside air temperature Ta_base, the compressor downstream pressure Pb_base, and the compressor downstream temperature Tb_base are set as reference values (for example, Ta_base = 25 ° C., Pb_base = 0 kPa, Tb_base = 75 ° C.), the reference temperature drop amount ΔTbase is calculated based on the intake air amount Ga and the vehicle speed SPD each time.

  Further, using the equation (10), a temperature correction coefficient is calculated based on the compressor downstream temperature Tc_out and the outside air temperature Ta.

なお、前述したとおりコンプレッサ下流圧Ｐc＿outが変化しても、インタークーラ３７に流入する質量流量は変化しないため、冷却効果（温度降下）に対する圧力補正は実施しない。

As described above, even if the compressor downstream pressure Pc_out changes, the mass flow rate flowing into the intercooler 37 does not change, so pressure correction for the cooling effect (temperature drop) is not performed.

  Then, the supercharging temperature Tth (throttle upstream temperature) is calculated by the following equation (11).

以上のようにして、インタークーラモデルＭ１５の出力である過給圧Ｐth（スロットル上流圧）と過給温Ｔth（スロットル上流温）とが算出される。

As described above, the supercharging pressure Pth (throttle upstream pressure) and the supercharging temperature Tth (throttle upstream temperature), which are outputs of the intercooler model M15, are calculated.

  The target power calculation unit 81 and the actual power calculation unit 82 in the assist control unit 80 of FIG. 2 are constructed based on the turbo model M10, and an outline thereof is shown as a control block diagram in FIG. Here, the target power calculator 81 calculates the target compressor power Lc_t by inverse calculation (inverse model) of the turbo model M10, and the actual power calculator 82 calculates the actual compressor by forward calculation (forward model) of the turbo model M10. The power Lc_r is calculated.

  In short, the target power calculation unit 81 uses the inverse models of the compressor model M13 and the intercooler model M15 in FIG. 4 and calculates the target boost pressure Pth_t (target throttle upstream pressure) and the target air amount Ga_t as main calculation parameters. As a result, the target compressor power Lc_t is calculated. In this case, in detail, in the intercooler inverse model, the target supercharging temperature Tth_t is calculated based on the target supercharging pressure Pth_t using a map (FIG. 10) based on actual machine data. Then, by constructing a reverse equation using the inverse models of FIG. 7 (intercooler pressure loss model) and FIG. 8 (cooling effect model), the target boost pressure Pth_t (target throttle upstream pressure), the target boost temperature Tth_t The target compressor downstream pressure Pc_out_t is calculated based on (target throttle upstream temperature), other target air amount Ga_t, outside air temperature Ta (compressor upstream temperature), and atmospheric pressure Pa (compressor upstream pressure).

  Next, in the inverse model of the compressor, the following formula (12) is used to calculate the target supercharging energy Wc_t from the target compressor downstream pressure Pc_out_t, the target air amount Ga_t, the outside air temperature Ta, and the atmospheric pressure Pa. Here, ca is the specific heat of air, and κa is the specific heat ratio of air.

更に、目標過給エネルギーＷc＿tをパラメータとして図１１に示す効率マップからコンプレッサ効率ηc＿tを算出すると共に、次の式（１３）により目標コンプレッサ動力Ｌc＿tを算出する。

Further, the compressor efficiency ηc_t is calculated from the efficiency map shown in FIG. 11 using the target supercharging energy Wc_t as a parameter, and the target compressor power Lc_t is calculated by the following equation (13).

また、実動力算出部８２では、上述したターボモデルの計算順と同様に、排気管モデル、タービンモデル（順モデル）、シャフトモデル（順モデル）を介して排気による実コンプレッサ動力Ｌc＿rを算出する。すなわち、排気管モデルにて算出したエンジン１０の排気パラメータ（排気流量ｍg、タービン上流圧Ｐtb＿in、タービン下流圧Ｐtb＿out、タービン上流温Ｔtb＿in、タービン断熱効率ηg）から上述の式（１）を用いて実タービン動力Ｌt＿rを算出する。更に、実タービン動力Ｌt＿rに動力変換効率ηtを乗算して実コンプレッサ動力Ｌc＿rを算出する。

Further, the actual power calculation unit 82 calculates the actual compressor power Lc_r due to the exhaust through the exhaust pipe model, the turbine model (forward model), and the shaft model (forward model) in the same manner as the calculation order of the turbo model described above. That is, from the exhaust parameters (exhaust flow rate mg, turbine upstream pressure Ptb_in, turbine downstream pressure Ptb_out, turbine upstream temperature Ttb_in, turbine adiabatic efficiency ηg) calculated by the exhaust pipe model, the above equation (1) is used. Turbine power Lt_r is calculated. Further, the actual compressor power Lc_r is calculated by multiplying the actual turbine power Lt_r by the power conversion efficiency ηt.

  The power difference calculation unit 83 calculates a power difference between the target compressor power Lc_t calculated as described above and the actual compressor power Lc_r (power difference = Lc_t−Lc_r). Then, the target compressor upstream pressure calculation unit 85 and the assist power calculation unit 86 (see FIG. 2) at the subsequent stage calculate the target compressor upstream pressure and further the required assist power based on the power difference, and then the assist power. A signal (motor command value) is output to the motor ECU 60.

  Next, the flow of processing for calculating the target throttle opening and assist power by the engine ECU 50 will be described based on the flowcharts of FIGS. FIG. 12 is a flowchart showing a base routine. This routine is executed by the engine ECU 50 every 4 msec, for example. Then, in the base routine of FIG. 12, the subroutines of FIGS. 13 to 17 are appropriately executed. Note that the processing flow described below basically conforms to the control block diagram of FIG. 2, and a part of the overlapping description is simplified.

  As shown in FIG. 12, the base routine includes a target throttle opening calculation routine (step S100) and an assist power calculation routine (step S200). FIG. 13 shows details of the target throttle opening calculation routine. 14 shows details of the assist power calculation routine.

  In the target throttle opening calculation routine shown in FIG. 13, first, the detected value of the accelerator opening is read (step S101), and then the target torque is calculated based on the accelerator opening and the engine speed (step S102). Further, the target air amount is calculated based on the target torque and the engine rotational speed (step S103), and the target intake pressure (target throttle downstream pressure) and the target boost pressure (based on the target air amount and the engine rotational speed). (Target throttle upstream pressure) is calculated (steps S104 and S105). Finally, the target throttle opening is calculated based on the target air amount, the target intake pressure, the target boost pressure, the actual boost pressure, and the throttle passage intake air temperature (step S106).

  In the assist power calculation routine shown in FIG. 14, first, a target compressor power is calculated based on the inverse model of the turbo model using a subroutine shown in FIG. 15 described later (step S210). Using the subroutine, the actual compressor power is calculated based on the forward model of the turbo model (step S220). Further, the power difference is calculated by subtracting the actual compressor power from the target compressor power (step S230). Then, using a subroutine of FIG. 17 to be described later, it is determined whether or not the power assist can be performed (step S240).

  Here, in the target compressor power calculation subroutine shown in FIG. 15, the target supercharging pressure and the target air amount are read (step S211), and then, for example, the target supercharging is performed based on the target supercharging pressure using the relationship of FIG. The temperature is calculated (step S212). Thereafter, using the inverse model of the intercooler, the target compressor downstream pressure is calculated in consideration of the pressure loss and the cooling effect in the intercooler (steps S213 and S214). Further, the target supercharging energy is calculated using the inverse model of the compressor, and the compressor efficiency is calculated using, for example, the relationship shown in FIG. 11 (steps S215 and S216). Then, the target compressor power is calculated from the target supercharging energy and the compressor efficiency (step S217).

  Next, the actual compressor power calculation subroutine shown in FIG. 16 includes an exhaust pipe model section, a turbine model section, and a shaft model section. In the exhaust pipe model section, the exhaust flow rate in the turbine is measured after the air amount is measured by the air flow meter 41. The exhaust gas flow rate is calculated in consideration of the delay until it is reflected as (step S221), and the exhaust characteristics (pressure and temperature upstream and downstream of the turbine) are calculated based on the exhaust gas flow rate (step S222). The turbine model unit calculates the turbine adiabatic efficiency ηg (step S223), and calculates the actual turbine power based on the exhaust parameters such as the exhaust flow rate, the exhaust pressure, the exhaust temperature, and the turbine adiabatic efficiency ηg (step S224). ). Further, the shaft model unit calculates actual compressor power based on the actual turbine power and the power conversion efficiency (step S225).

  Next, in the assist determination routine shown in FIG. 17, the amount of pressure loss generated in the upstream portion of the intake pipe such as an air cleaner is calculated using the relationship shown in FIG. 3, for example (step S241), and then, for example, the relationship shown in FIG. The target compressor upstream pressure is calculated based on the compressor power deviation (power difference) and the pressure loss amount (step S242). Further, for example, using the relationship shown in FIG. 5, the assist power Wa is calculated based on the target compressor upstream pressure and the exhaust power (step S243). Further, an upper limit guard based on the motor characteristics and the motor temperature is performed on the assist power Wa (step S244).

  Thereafter, it is determined whether or not the assist power Wa is larger than a predetermined value Wa_th (step S245). If Wa> Wa_th, the assist permission flag Fa is set to 1, and if Wa ≦ Wa_th, the assist permission flag Fa is set to 0. Is set (steps S246 and S247). As a result, the power assist by the motor 38a of the auxiliary compressor 38 is executed when Wa> Wa_th (assist permission flag Fa = 1), and the same motor when Wa ≦ Wa_th (assist permission flag Fa = 0). The power assist by 38a is stopped.

  FIG. 18 is a time chart showing various behaviors when the assist control in the present embodiment is used.

  Now, when the accelerator opening is changed as shown in (a) and acceleration is started, the target torque is increased in response to the acceleration request, and the target boost pressure is increased accordingly (b). Further, as shown in (c), the target compressor power increases, and the actual compressor power rises with a delay from the target compressor power. In this case, the power difference between the target compressor power and the actual compressor power is calculated as shown in (d), and the assist power of the auxiliary compressor 38 (motor 38a) is calculated as shown in (e) based on this power difference. Is done. By performing the assist control in this way, the actual supercharging pressure increases so as to follow the target value as shown in (f), and improvement in acceleration is realized. At the same time, the target torque required by the driver can be obtained reliably. After that, when the actual compressor power sufficiently increases with respect to the target compressor power, the assist power is set to zero. In the chart part (f), the behavior of the actual supercharging pressure when the power assist is not applied is indicated by a dotted line, and in this case, it can be seen that the increase of the actual supercharging pressure is greatly delayed.

  Incidentally, as shown in (f), when the boost pressure is increased, the actual boost pressure rises quickly following the target value regardless of the presence or absence of power assist until the reference pressure (atmospheric pressure) is reached, After that, there is a large difference in the increase rate of the supercharging pressure depending on the presence or absence of power assist.

  According to the embodiment described above in detail, the following excellent effects can be obtained.

  The turbocharger 30 calculates the assist power based on the power difference between the target compressor power and the actual compressor power, and the power assist of the auxiliary compressor 38 (the motor 38a) is controlled by the calculated assist power. By using the shortage with respect to the amount of assist, efficient assist control without waste can be performed. Further, since the assist power is calculated by comparing the power, it is possible to perform the assist control that is more direct and excellent in responsiveness than the case where the assist power is calculated using other parameters such as supercharging pressure. As described above, power assist by the auxiliary compressor 38 provided on the upstream side of the compressor of the turbocharger 30 can be appropriately controlled, and as a result, fuel efficiency and drivability can be improved.

  In particular, the target compressor upstream pressure (target pressure between the auxiliary compressor 38 and the compressor impeller 31) is calculated based on the power difference between the target compressor power and the actual compressor power, and the assist is performed based on the calculated target compressor upstream pressure. Since the power is calculated, the upstream pressure (compressor inlet pressure) of the compressor impeller 31 can be controlled to a pressure commensurate with the power difference, thereby realizing appropriate power assist with no excess or deficiency.

  Since the target turbine power is calculated based on the target air amount used for engine torque control (air amount control), the throttle valve 14 (air amount adjusting means) and the auxiliary compressor 38 (auxiliary supercharging device) are provided. It will be controlled in cooperation, and the accuracy of torque control will improve. Therefore, excess or deficiency of engine output is solved, and drivability and the like can be further improved.

  Using the electric turbo model M10, which is a physical model representing the flow of power in the turbocharger 30, the target compressor power is calculated by the inverse model of the turbo model (inverse models of the intercooler and compressor), and the turbo model Since the actual compressor power is calculated by the forward model (forward model of turbine and shaft), the target compressor power and the actual compressor power can be calculated with high accuracy, and the accuracy of the power assist control can be improved.

  Further, by using the auxiliary compressor 38 separated from the turbocharger 30 as the auxiliary supercharging device, the existing turbo system is not forced to be remodeled or reconstituted, and a suitable power assist supercharging system. Can be built.

  In addition, this invention is not limited to the content of description of the said embodiment, For example, you may implement as follows.

  In the above-described embodiment, the auxiliary compressor 38 (auxiliary supercharging device) is provided in the intake pipe 11 on the upstream side of the compressor of the turbocharger 30. However, instead of this configuration, the auxiliary compressor (auxiliary) is provided on the downstream side of the compressor of the turbocharger 30. A supercharging device) may be provided. In this case, the target compressor downstream pressure (target compressor outlet pressure) is calculated based on the power difference between the target compressor power and the actual compressor power, and the assist power is calculated based on the target compressor downstream pressure. Thereby, the downstream pressure (compressor outlet pressure) of the compressor impeller 31 can be controlled to a pressure commensurate with the power difference, thereby realizing appropriate power assist without excess or deficiency.

  In the above embodiment, the power difference between the target compressor power of the turbocharger 30 and the actual compressor power is calculated, and the motor assist amount is calculated based on the power difference. However, this configuration is changed, and the target of the turbocharger 30 is changed. A power difference between the turbine power and the actual turbine power may be calculated, and the motor assist amount may be calculated based on the power difference.

  In the above embodiment, the assist power is calculated as the assist amount by the auxiliary compressor 38, and the auxiliary compressor 38 (motor 38a) is driven so as to realize the assist power. Instead, the compressor rotation is performed as the assist amount. It is also possible to calculate the number and control the driving of the auxiliary compressor 38 (motor 38a) so as to realize the compressor rotation speed.

  In the above embodiment, calculation of compressor power (target compressor power, actual compressor power) in the assist control unit 80 is performed using the turbo model. However, other methods may be used. For example, the target compressor power or the actual compressor power may be calculated by map calculation.

  In the above embodiment, the target boost pressure is calculated based on the target air amount calculated from the target torque in the torque base control unit 70 (FIG. 2). Instead, the target boost pressure is directly calculated from the target torque. May be calculated.

  In the above embodiment, the actual supercharging pressure is obtained from the detection value detected by the supercharging pressure sensor 12, and the target throttle opening is calculated using this actual supercharging pressure. The supercharging pressure may be obtained, and the target throttle opening degree may be calculated using this estimated value. Specifically, the turbo model described in FIG. 4 is used, and the boost pressure obtained as the output of the model is preferably used as the estimated value of the actual boost pressure.

  Further, instead of the configuration for calculating the target compressor upstream pressure (target pressure between the auxiliary compressor 38 and the compressor impeller 31) based on the power difference between the target compressor power and the actual compressor power, it is based on the engine operating state or the like. The target compressor upstream pressure may be calculated. Then, assist power is calculated based on the target compressor upstream pressure. In this case, the actual compressor upstream pressure may be measured by a sensor or the like, and feedback control may be performed so that the measured value becomes the target compressor upstream pressure. According to this configuration, the compressor upstream pressure can be controlled to a desired pressure. As a result, it is possible to realize appropriate power assist without excess or deficiency.

  In such a configuration, when calculating the assist power, a pressure loss amount (pressure loss amount generated in the upstream portion of the intake pipe) or exhaust power may be added as a calculation parameter. In addition, what is necessary is just to use the said FIGS. 3-6 for the relationship of each parameter used when calculating assist power.

  Further, the assist timing by the auxiliary compressor 38 may be determined by comparing the actual supercharging pressure and a predetermined reference pressure. That is, it is determined whether or not the actual boost pressure has reached a predetermined reference pressure, and the power assist by the auxiliary compressor 38 is stopped before it is determined that the actual boost pressure has reached the reference pressure. The “reference pressure” is, for example, atmospheric pressure. In other words, when the boost pressure rises, the actual boost pressure rises quickly following the target value regardless of the presence or absence of power assist until it reaches the reference pressure (atmospheric pressure). Accordingly, there is a large difference in the rate of increase of the supercharging pressure. Therefore, it can be said that the power assist is substantially unnecessary until the actual supercharging pressure reaches the reference pressure (atmospheric pressure). Therefore, by stopping the power assist until the actual supercharging pressure reaches the reference pressure as described above, energy consumption due to the power assist can be reduced.

It is a block diagram which shows the outline of the engine control system in embodiment of invention. It is a control block diagram for demonstrating the function of engine ECU. It is a figure for calculating a pressure loss amount. It is a figure for calculating a target compressor upstream pressure. It is a figure for calculating assist power. It is a control block diagram which shows a turbo model. It is a figure which shows the pressure loss model of an intercooler model. It is a figure which shows the cooling effect model of an intercooler model. It is a control block diagram which shows the detail of the target power calculation part in an assist control part, and an actual power calculation part. It is a figure which shows the relationship between a supercharging pressure and a supercharging temperature. It is a figure which shows the relationship between supercharging energy and compressor efficiency. It is a flowchart which shows the base routine by engine ECU. It is a flowchart which shows the calculation routine of target throttle opening. It is a flowchart which shows the calculation routine of assist power. It is a flowchart which shows the calculation routine of target compressor power. It is a flowchart which shows the calculation routine of real compressor power. It is a flowchart which shows an assist determination routine. It is a time chart which shows the various behavior at the time of assist control in embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Engine, 21 ... Intake pipe, 24 ... Exhaust pipe, 30 ... Turbocharger, 31 ... Compressor impeller, 32 ... Turbine wheel, 33 ... Shaft, 37 ... Intercooler, 38 ... Auxiliary compressor, 38a ... Motor, 50 ... Engine ECU.

Claims (14)

An internal combustion engine having a supercharger that supercharges intake air by exhaust power, and an auxiliary supercharger that is provided upstream or downstream of the supercharger in the intake passage and is operated using power other than exhaust as a power source In the control device that controls the output torque of the internal combustion engine by adjusting the intake air amount to the internal combustion engine by the air amount adjusting means,
Target power calculation means for calculating the target power of the supercharger based on information on the intake air amount of the internal combustion engine;
Actual power calculating means for calculating the actual power of the supercharger;
An assist amount calculating means for calculating an amount to be assisted by the auxiliary supercharging device based on the target power and actual power of the supercharger;
Assist control means for controlling the auxiliary supercharging device according to the calculated assist amount;
A control device for an internal combustion engine with a supercharger. Means for calculating a target air amount based on a target torque corresponding to a driver's request, and means for performing air amount control by the air amount adjusting means based on the calculated target air amount;
The control device for an internal combustion engine with a supercharger according to claim 1, wherein the target power calculation means calculates a target power of the supercharger based on the target air amount. Means for calculating a target boost pressure based on the target air amount;
The target power calculation means adds the target supercharging pressure to a calculation parameter and calculates the target power of the supercharger based on the target air amount and the target supercharging pressure. The control apparatus of the internal combustion engine with a supercharger as described.   The assist amount calculating means calculates a target pressure in the intake passage between the supercharger and the auxiliary supercharging device based on a power difference between the target power and actual power of the supercharger, and the calculation The control device for an internal combustion engine with a supercharger according to any one of claims 1 to 3, further comprising means for calculating an assist amount by the auxiliary supercharger based on the target pressure.   The control device for an internal combustion engine with a supercharger according to claim 4, wherein the assist amount calculation means increases the assist amount by the auxiliary supercharging device as the target pressure increases. Means for calculating a pressure loss amount generated upstream of the supercharger in the intake passage;
The said assist amount calculation means calculates the assist amount by the said auxiliary | assistant supercharging apparatus based on the said target pressure and the said pressure loss amount, adding the said pressure loss amount to a calculation parameter, Claim 4 or 5 characterized by the above-mentioned. The control apparatus of the internal combustion engine with a supercharger as described. An internal combustion engine having a supercharger that supercharges intake air by exhaust power, and an auxiliary supercharger that is provided upstream or downstream of the supercharger in the intake passage and is operated using power other than exhaust as a power source Applies to
Target power calculation means for calculating the target power of the supercharger based on the operating state of the internal combustion engine;
Actual power calculating means for calculating the actual power of the supercharger;
An assist amount calculating means for calculating an amount to be assisted by the auxiliary supercharging device based on the target power and actual power of the supercharger;
Assist control means for controlling the auxiliary supercharging device according to the calculated assist amount;
A control device for an internal combustion engine with a supercharger. Means for obtaining an exhaust parameter relating to exhaust discharged from the internal combustion engine by estimation or measurement;
The control device for an internal combustion engine with a supercharger according to any one of claims 1 to 7, wherein the actual power calculation means calculates the actual power of the supercharger based on the exhaust parameter. As the supercharger, a turbocharger having a turbine wheel rotated by exhaust power and a compressor impeller connected to the turbine wheel via a shaft is used, and the intake air is compressed by the rotation of the compressor impeller for supercharging. A control device applied to an internal combustion engine to perform,
Using a turbo model in which the flow of power from the turbine wheel to the compressor impeller is modeled for each component of the turbocharger,
The actual power calculation means calculates the actual power of the turbocharger from a turbine model that models at least the turbine wheel of the turbo model,
The overpower according to any one of claims 1 to 8, wherein the target power calculation means calculates a target power of the supercharger from a compressor model obtained by modeling at least the compressor impeller of the turbo model. Control device for an internal combustion engine with a feeder.   The actual power calculation means calculates the actual power of the turbocharger by calculating the forward direction of the turbo model using exhaust information as an input parameter, and the target power calculation means inputs supercharging pressure information and intake air information. The control device for an internal combustion engine with a supercharger according to claim 9, wherein the target power of the supercharger is calculated by calculating the reverse direction of the turbo model as a parameter. An internal combustion engine having a supercharger that supercharges intake air by exhaust power, and an auxiliary supercharger that is provided upstream or downstream of the supercharger in the intake passage and is operated using power other than exhaust as a power source In the control device that controls the output torque of the internal combustion engine by adjusting the intake air amount to the internal combustion engine by the air amount adjusting means,
Target pressure calculating means for calculating a target pressure in an intake passage between the supercharger and the auxiliary supercharger;
An assist amount calculating means for calculating an amount to be assisted by the auxiliary supercharging device based on the calculated target pressure;
Assist control means for controlling the auxiliary supercharging device according to the calculated assist amount;
A control device for an internal combustion engine with a supercharger.   The target pressure calculating means calculates the target pressure based on the operating state of the internal combustion engine, and the assist amount calculating means increases the assist amount by the auxiliary supercharging device as the target pressure increases. The control apparatus for an internal combustion engine with a supercharger according to claim 11.   The control device for an internal combustion engine with a supercharger according to any one of claims 1 to 12, wherein the auxiliary supercharger is an auxiliary compressor that compresses intake air using power other than exhaust as a power source.   Means for determining whether or not the actual supercharging pressure has reached a predetermined reference pressure, and stopping the power assist by the auxiliary supercharging device before determining that the actual supercharging pressure has reached the reference pressure. The control apparatus for an internal combustion engine with a supercharger according to any one of claims 1 to 13.

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