JP5406270B2 - Method and apparatus for driving hybrid vehicle with electric supercharger - Google Patents

Description

  The present invention relates to a driving method and a driving device for a hybrid vehicle, and more particularly, a driving method for a hybrid vehicle including an electric supercharger, which controls a delay in torque with respect to an acceleration request while monitoring a state quantity of a battery, And a drive device.

Conventionally, a hybrid vehicle drive device that incorporates an electric supercharging system in a so-called hybrid vehicle and drives the hybrid drive motor and the electric supercharging system simultaneously in a high output region, with the aim of realizing low fuel consumption of the automobile. For example, Patent Document 1 proposes. According to the conventional hybrid vehicle drive device disclosed in Patent Document 1, both the hybrid drive motor and the electric supercharging system are used in a region where the vehicle speed is high or a region where both the vehicle speed and the target torque are large. By driving the vehicle, good acceleration of the vehicle can be obtained.

  Conventionally, for example, Patent Document 2 proposes a hybrid vehicle in which the driving method is changed in accordance with the amount of power stored in the battery. A conventional hybrid vehicle disclosed in Patent Document 2 is an electric supercharging system in a system in which an electric supercharging system and a drive motor generator are used in combination to perform torque assist. And the torque assist ratio of the drive motor generator is changed.

  Further, for example, Patent Literature 3 proposes a powertrain control device that compensates for a torque response delay of an electric supercharger with a motor generator. The conventional powertrain control device disclosed in Patent Document 3 is designed to increase the torque response of the electric supercharger when the electric turbocharger is shifted from the non-operating region to the operating region. The internal combustion engine drive motor is controlled so as to approach the characteristics.

JP-A-11-332015 JP 2005-240580 A JP 2005-198412 A

  Since the conventional device disclosed in Patent Document 1 needs to continue to supply electric power to the electric supercharging system and the drive motor on an expressway or the like where a region where the vehicle speed is high continues continuously, the battery There is a problem that a desired acceleration performance cannot be obtained for the driver when the amount of stored power decreases.

  Further, the conventional device disclosed in Patent Document 2 eliminates the driver's uncomfortable feeling by changing the ratio of the assist amount by the drive motor generator in consideration of the amount of charge of the battery. When the battery charge is less than the specified value, the driver's torque is assisted only by electric supercharging, but until the air charge amount to the internal combustion engine by the electric supercharger reaches a desired value, A mechanical response delay of the turbocharger itself occurs. Therefore, there is a problem that the response of the internal combustion engine is delayed with respect to the driver's acceleration request, and the driver feels uncomfortable.

  Further, the conventional device disclosed in Patent Document 3 assists the response delay of the electric supercharger with the motor generator, and the target value of the response is determined by the internal combustion engine torque in the non-operating region of the electric supercharger. Control is performed so as to approach the torque rising characteristics of the internal combustion engine when starting up. However, considering that the target value of response is closer to the driver's acceleration request, the rising characteristic of the internal combustion engine torque by the conventional device shown in Patent Document 3 is sufficient to satisfy the driver. It may not be. Moreover, in the conventional apparatus shown in Patent Document 3, since the power generation of the motor generator for driving the internal combustion engine is not considered in the target assist torque determination method, in the region where a response is required, the electric supercharger is supplied. In the steady operation area, when power is supplied from the battery and the power is generated by the motor generator and supplied to the load, the driving force necessary for power generation is lost from the internal combustion engine output, so the driver feels slowing down. There is a problem that you may feel.

  The present invention has been made in order to solve the above-described problems in the conventional apparatus, and is capable of obtaining the required torque with good response without feeling uncomfortable with respect to the driver's acceleration request. An object of the present invention is to provide a driving method and a driving device for a hybrid vehicle including a supercharger.

A method for driving a hybrid vehicle equipped with an electric supercharger according to the present invention includes:
An electric supercharger disposed in an intake passage of the internal combustion engine; a motor generator driven by the driving force of the internal combustion engine to generate electric power or receive power supplied from a power storage device to assist the driving force of the internal combustion engine; A method for driving a hybrid vehicle including an electric supercharger, comprising an accelerator operation amount detection device that detects an accelerator operation amount of a driver,
Calculating the driver's required driving force based on at least the output of the accelerator operation amount detection device; and
A step of calculating electric power required to drive the electric supercharger based on the calculated required driving force;
A step of calculating a driving force of the motor-generator necessary to power by the electric power the operation the motor-generator,
The target driving force of the internal combustion engine is calculated so that a value obtained by subtracting the driving force of the motor generator from the driving force of the internal combustion engine, which is increased by supercharging by the electric supercharger, becomes the required driving force. Process,
With
When the required driving force is in a region where supercharging by the electric supercharger is necessary, the electric power generation of the motor generator is stopped, and the electric driving force of the internal combustion engine is assisted by the driving force of the motor generator. Drive the turbocharger,
After the driving force of the internal combustion engine reaches the target driving force, the motor generator is driven by the driving force of the internal combustion engine supercharged by the electric supercharger to generate electric power,
Driving the electric supercharger with the generated electric power;
It is characterized by this.

Moreover, the drive device of the hybrid vehicle provided with the electric supercharger according to the present invention is
An electric supercharger disposed in an intake passage of the internal combustion engine; a motor generator driven by the driving force of the internal combustion engine to generate electric power or receive power supplied from a power storage device to assist the driving force of the internal combustion engine; A driving device for a hybrid vehicle including an electric supercharger, and an accelerator operation amount detection device that detects an accelerator operation amount of a driver,
Calculating the driver's required driving force based on at least the output of the accelerator operation amount detection device; and
A step of calculating electric power required to drive the electric supercharger based on the calculated required driving force;
A step of calculating a driving force of the motor-generator necessary to power by the electric power the operation the motor-generator,
The target driving force of the internal combustion engine is calculated so that a value obtained by subtracting the driving force of the motor generator from the driving force of the internal combustion engine, which is increased by supercharging by the electric supercharger, becomes the required driving force. Process,
With
When the required driving force is in a region where supercharging by the electric supercharger is necessary, the electric power generation of the motor generator is stopped, and the electric driving force of the internal combustion engine is assisted by the driving force of the motor generator. Drive the turbocharger,
After the driving force of the internal combustion engine reaches the target driving force, the motor generator is driven by the driving force of the internal combustion engine supercharged by the electric supercharger to generate electric power,
Using a method for driving a hybrid vehicle including an electric supercharger that drives the electric supercharger with the generated electric power,
It is characterized by this.

  According to the method of driving a hybrid vehicle including the electric supercharger according to the present invention, the drive torque can be followed with good response to the driver's acceleration request, and the internal combustion engine for supplying electric power to the electric supercharger. Since the driving torque is corrected in view of the driving force generated by the motor generator that assists the engine output, the vehicle can be driven without causing the driver to feel uncomfortable.

  In addition, according to the hybrid vehicle drive device equipped with the electric supercharger according to the present invention, the drive torque can be followed with good response to the driver's acceleration request, and power is supplied to the electric supercharger. Since the driving torque is corrected in view of the driving force generated by the motor generator that assists the output of the internal combustion engine, the vehicle can be driven without causing the driver to feel uncomfortable.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a hybrid vehicle equipped with an electric supercharger to which a hybrid vehicle drive method and drive device according to Embodiment 1 of the present invention are applied. It is a flowchart which shows the drive method of the hybrid vehicle by Embodiment 1 of this invention, and operation | movement of a drive device. It is explanatory drawing which shows the hybrid vehicle drive method by Embodiment 1 of this invention, and operation | movement of a drive device.

Embodiment 1 FIG.
Hereinafter, a driving method and a driving apparatus for a hybrid vehicle according to a first embodiment of the present invention will be described with reference to the drawings.

  1 is an overall configuration diagram of a hybrid vehicle equipped with an electric supercharger to which a hybrid vehicle drive method and drive device according to Embodiment 1 of the present invention are applied. In FIG. 1, an internal combustion engine 1 is a multi-cylinder internal combustion engine. In the first embodiment, the internal combustion engine 1 is illustrated as a three-cylinder internal combustion engine, but the number of internal combustion engine cylinders is not limited to three. The internal combustion engine 1 is configured so that a large amount of intake air is supercharged by an electric motor supercharger 7 to be described later, thereby realizing high output and low fuel consumption. The applied internal combustion engine 1 can be applied not only to a direct internal combustion engine that injects fuel into a cylinder, but also to a port injection internal combustion engine that injects fuel into an intake passage on the upstream side of the throttle valve 6. is there.

  The opening degree of the throttle valve 6 is controlled based on the operation of the accelerator pedal (not shown) by the driver. An accelerator operation amount detection device (not shown) detects an operation amount of a driver's accelerator pedal and generates an output corresponding to the operation amount. The accelerator operation amount detection device may be configured to directly detect the opening degree of the throttle valve 6 and generate an output corresponding to the detected opening degree.

The external air sucked through the intake air passage 2 is first removed from the dust and dust by the air cleaner 3, then enters the upstream passage 4 of the electric supercharger 7, and is then compressed by the electric supercharger 7. And input to the intercooler 5 through the downstream passage 12 of the electric supercharger 7. The intercooler 5 lowers the temperature of the intake air whose temperature has increased with an increase in pressure due to supercharging, and improves the air charging efficiency. The air cooled by the intercooler 5 is further drawn into the cylinder of the internal combustion engine 1 through the throttle valve 6.

  In the operation region where the electric supercharger 7 does not need to be driven, the electric supercharger 7 serves as a flow path resistance of the intake air. Therefore, the bypass passage 9 is opened by opening the bypass valve 8 of the electric supercharger 7. It becomes possible to send air to the internal combustion engine through. Further, the bypass passage 9 may reduce the pressure in the downstream passage 12 of the electric supercharger 7 by opening the bypass valve 8 even when the throttle valve 6 is suddenly closed from the supercharging state. Good.

  The electric supercharger 7 has a function of compressing the input air by driving the compressor impeller 10 by the electric supercharger electric motor 11. The electric supercharger motor 11 is driven by an electric supercharger control device 13 to which electric power is supplied from the power storage device 14. A target value for operating the electric supercharger 7 is input to the electric supercharger control device 13 from a host controller (not shown). The electric supercharger control device 13 is a power converter that converts electric power input from the microcomputer for driving the electric supercharger electric motor 11 or the power storage device 14 into electric power for driving the electric motor for the electric supercharger. It has.

  The output shaft of the internal combustion engine 1 is connected to the rotor shaft of the motor generator 16 that assists the output of the internal combustion engine 1 via the first clutch 15. The rotor shaft of the motor generator 16 is connected to the second clutch 17. To the transmission 19. By closing the first clutch 15, the output of the internal combustion engine 1 and the output of the motor generator 16 are added, and the added output causes the tire 20 to pass through the transmission 19 by closing the second clutch 17. To drive.

  The motor generator 16 includes a first drive mode for assisting the output of the internal combustion engine 1, a power generation mode for generating power using the output of the internal combustion engine 1, and motor drive only when the first clutch 15 is released. Thus, there are three different operation modes: a second drive mode in which the tire 20 is driven via the transmission 19.

  The motor generator 16 is controlled by a motor generator control device (hereinafter referred to as an MG control device) 18 that receives supply of electric power from the power storage device 14 and enters the state of the first drive mode or the second drive mode described above. A target value for driving the motor generator 16 is input to the MG control device 18 from the above-described host controller. The MG control device 18 includes a microcomputer for driving the motor generator 16 and a power converter that converts electric power input from the power storage device 14 into electric power for driving the motor generator.

  The motor generator 16 is driven by the output of the internal combustion engine 1 and enters the aforementioned power generation mode to generate AC power. The AC power generated by the motor generator 16 is converted into DC power by the MG control device 18 and supplied to the power storage device 14 and other electrical devices connected to the power storage device 14. It is also well known that the motor generator 16 not only uses the output of the internal combustion engine 1 as a drive source, but is also driven by deceleration energy when the vehicle decelerates to generate regenerative power. A target value for generating power by the motor generator 16 is input to the MG control device 18 from the above-described host controller.

When the first clutch 15 is disengaged, the motor generator 16 is driven by the MG control device 18 that is supplied with electric power from the power storage device 14, thereby driving the tire 20 only by the motor driving described above. This is the state of the drive mode. This second drive mode is
Although it is selected depending on the amount of power stored in the power storage device 14 and the traveling state of the vehicle, the description thereof is omitted because it is not directly related to this invention.

Next, a method for driving a hybrid vehicle equipped with the electric supercharger according to the first embodiment of the present invention and an operation of the drive device will be described. FIG. 2 is a flowchart showing the operation of the hybrid vehicle equipped with the electric supercharger and the operation of the drive device according to Embodiment 1 of the present invention. The flowchart shown in FIG. 2 includes steps S201 to S208 between the start and the end.

  In FIG. 2, first, in step S201, the required driving force requested by the driver is calculated based on the output signal from the accelerator operation amount detection device, and the calculated required driving force is stored in the memory. Next, in step S202, based on the required driving force stored in step S201, it is determined whether or not the operating point of the internal combustion engine is a region requiring supercharging. As a result of the determination, if it is not an area where supercharging is required (NO), the electric turbocharger 7 is ended without operating, and if it is an area where electric supercharger is required (YES), the process proceeds to step S203. .

  In step S203, the amount of electric power required by the electric supercharger 7 is calculated based on the aforementioned required driving force, and the aforementioned required driving force is calculated based on the calculated electric energy required by the electric supercharger 7. Is corrected and the target driving force is calculated.

  To describe the process in step S203 in more detail, first, the amount of power required by the electric supercharger 7 is calculated based on the required driving force. For the calculation of the electric energy, for example, a map storing the electric energy required by the electric supercharger 7 corresponding to the operating point of the internal combustion engine 1 is stored in the memory in advance, and the requested driving requested by the driver is performed. You may make it extract the electric energy which the electric supercharger 7 requires based on the above-mentioned map from the operating point of the internal combustion engine required for force. Or you may make it calculate the electric energy which the electric supercharger 7 requires from state quantities, such as an air flow rate in the operating point of the internal combustion engine 1, and a supercharging pressure. After calculating the electric energy necessary for the electric supercharger 7 as described above, the driving force necessary for the motor generator 16 to generate the electric energy necessary for the calculated electric supercharger 7 is calculated. Then, the required driving force is corrected by subtracting the calculated driving force required for the motor generator 16 to generate power from the required driving force, and the target driving force is calculated.

  Next, it progresses to step S204 and drives the motor generator 16 and the electric supercharger 7 based on the target driving force calculated in step S203. At this time, the electric supercharger 7 cannot compress air unless the rotation speed of the compressor impeller 10 is increased to, for example, about 600 million [rpm] due to the characteristics of the compressor impeller 10. Due to the influence of the moment of inertia of the electric motor 11 for the electric supercharger and the compressor impeller 10, the electric supercharger 7 cannot immediately compress the air even after the driving is started. In the internal combustion engine 1 as well, there is a time delay until the required driving force is obtained by sucking air into the cylinder and burning the combustible mixture.

  In contrast, since the motor generator 16 is driven based on electric power, the motor generator 16 generally has higher responsiveness to the required driving force than the internal combustion engine 1. According to the first embodiment of the present invention, in the operation state of the supercharging required region, basically, the control is performed so that the output of the supercharged internal combustion engine 1 becomes the required driving force. The output response delay is compensated by the motor generator 16.

In the next step S205, the internal combustion engine driving force that is the output of the internal combustion engine 1 and the motor generator driving force that is the driving force of the motor generator 16 are calculated and stored. Next, in step S206, it is determined whether or not the total value of the internal combustion engine driving force and the motor generator driving force calculated in step S205 has reached the target driving force calculated in step S203. If the sum of the internal combustion engine driving force and the motor generator driving force has not reached the target driving force as a result of the determination in step S206 (NO), the process returns to step S205 to repeat the above calculation. On the other hand, when it is determined that the sum of the internal combustion engine driving force and the motor generator driving force has reached the target driving force as a result of the determination in step S206 (YES), the process proceeds to step S207.

  In step S207, the total value of the internal combustion engine driving force and the motor generator driving force is maintained at the target driving force while the motor generator driving force is reduced in accordance with the increase of the internal combustion engine driving force supercharged by the electric supercharger 7. To control. When the internal combustion engine driving force supercharged by the electric supercharger 7 becomes larger than the target driving force, the motor generator 16 is operated as a generator so as to maintain the above-mentioned target driving force.

  When the internal combustion engine driving force cannot be directly detected or calculated, the internal combustion engine driving force is calculated using the supercharging pressure by the electric supercharger 7 or the rotational speed of the electric supercharger 7, and the motor generator 16. The driving force may be adjusted. Generally, when the rotation speed of the compressor impeller 10 is determined, the supercharging pressure ratio is determined. From the supercharging pressure ratio of air to the internal combustion engine 1, the driving force of the internal combustion engine 1 can be simply approximated by, for example, proportional calculation. By using such calculation, it is possible to simplify the means for obtaining the driving force of the internal combustion engine, and to realize means for obtaining the driving force of the internal combustion engine.

  In the next step S208, it is determined whether the electric power generated by the motor generator 16 is equal to the electric power of the electric supercharger 7 while keeping the target driving force constant. As a result of the determination in step S207, if the electric power generated by the motor generator 16 is smaller than the electric power of the electric supercharger 7 (NO), the process returns to step S207, and further supercharging is performed by the electric supercharger 7. The amount of power generated by the motor generator 16 is increased while maintaining the driving force at the target driving force. The above operation is repeated until the electric power generated by the motor generator 16 becomes equal to the electric power of the electric supercharger 7. On the other hand, as a result of the determination in step S207, if it is determined that the electric power of the motor generator 16 is equal to the electric power of the electric supercharger 7 (YES), the process is terminated.

  FIG. 3 is an explanatory view showing the operation of the hybrid vehicle drive method and drive device provided with the electric supercharger according to Embodiment 1 of the present invention, and shows a case where the operation is performed based on the flowchart of FIG. . 3A is a time transition of the required driving force and the actual driving force, FIG. 3B is a time transition of the internal combustion engine driving force, FIG. 3C is a time transition of the motor generator driving force, and FIG. The time transition of the increase in driving force by the turbocharger is shown.

  In FIG. 3, first, at time t0, the required driving force is calculated by the driver's accelerator pedal operation. Thereafter, the electric supercharger 7 and the motor generator 16 are driven after the processing in steps S202 and S203 in the flowchart of FIG. 2 described above. The internal combustion engine driving force b1 shown in (b) of FIG. 3 and the motor generator driving force c1 shown in (c) of FIG. 3 gradually increase from time t0 to time t1 as shown in the figure.

  At time t1, when the actual driving force a1 that is the sum of the internal combustion engine driving force b1 and the motor generator driving force c1 matches the required driving force a0, the motor generator driving force c1 is decreased, but the internal combustion engine driving force b1. Continues to increase. Next, at time t2, the electric supercharger 7 reaches a predetermined rotational speed and starts supercharging. From this point, the internal combustion engine driving force b1 enters the supercharging region. As shown in FIG. 3 (d), the driving force increase d1 by the electric supercharger 7 gradually increases from time t0, but the degree of increase increases after time t2.

Next, at time t3, the motor generator driving force c1 reaches “0”, and after that time, the required driving force a0 and the actual driving force a1 are matched only with the internal combustion engine driving force b1. After time t3, power is generated by the motor generator 16, and the driving force of the motor generator 16 becomes a negative value. The electric power generated by the motor generator 16 is supplied to the electric supercharger 7. Control is performed so that a value obtained by subtracting the driving force c1 required for power generation by the motor generator 16 from the internal combustion engine driving force b1 supercharged by the electric supercharger 7 matches the required driving force a1.

  At time t4, the electric power generated by the motor generator 16 reaches a steady state until the electric power required for driving the electric supercharger 7 is reached, and unless the required driving force a1 is changed, the state is maintained until time t5. To maintain.

  Here, from time t0 to time t4, electric power is supplied from the power storage device 14 provided in the vehicle to the electric supercharger driving motor 11, so that the power storage amount of the power storage device 14 decreases. Therefore, it is desirable to control the state at time t4 as soon as possible.

  The broken-line waveforms shown in FIGS. 3B, 3C, and 3D show the actual driving force a1 shown in FIG. 3A, and the internal combustion engine driving force a1 and the motor generator driving force c1. It corresponds to the total value.

  As described above, according to the driving method and the driving device for the hybrid vehicle including the electric supercharger according to the first embodiment of the present invention, the driver's required driving force is followed with good response, and the electric supercharging is performed. It is possible to supply supercharged air from the engine to the internal combustion engine and obtain an internal combustion engine output with good combustion efficiency. Further, by supplying the electric power required for the electric supercharger by the electric power generated by the motor generator, the operation of the electric supercharger can be continued.

  In the first embodiment, the motor generator 16 and the electric supercharger 7 are driven at the same time so as to match the required driving force. At this time, the driving amount of the motor generator 16 is set according to the charging amount of the power storage device 14. You may make it adjust. By operating in this manner, the response to the driver's required driving force is reduced. However, excessive power consumption when the amount of power stored in the power storage device 14 is reduced is the voltage of the power storage device 14. Since the voltage of the entire system may be insufficient due to a decrease in power and a power failure may occur, adjusting the driving amount of the motor generator 16 according to the amount of power stored in the power storage device 14 prevents a voltage drop in the power storage device 14 and 14 itself can be protected.

  In the first embodiment described above, the internal combustion engine speed of the internal combustion engine 1 is not considered in the above description. However, when the rotational speed of the internal combustion engine 1 is high, the internal combustion engine is driven by driving the motor generator 16. The output assist of 1 may be reduced. In this way, a motor generator with a large output is required to assist driving by the motor generator 16 in the region where the rotational speed of the internal combustion engine 1 is high. Therefore, in the region where the rotational speed of the internal combustion engine 1 is high, the motor By reducing the drive of the generator 16, the system can be realized with a motor generator having a small maximum output, and can be realized at a lower cost.

  Further, in the first embodiment, as described above, the power supplied to the electric supercharger 7 matches the power generated by the motor generator 16 at time t5 in FIG. However, other in-vehicle electric devices are mounted on actual vehicles, and electric power to supply them is required. Therefore, the load electric power of the in-vehicle electric device is stored in the memory, and for example, at time t0 in FIG. 3, the electric power required for the electric supercharger 7 and the electric power required for the other in-vehicle electric device are added together. The generated power generation amount may be used as the power generation amount by the motor generator 16. By determining the power generation amount of the motor generator 16 in this way, the power supplied from the power storage device 14 is reduced, and it is possible to realize a system that is robust in terms of power.

Further, when the sum of the required power of the electric supercharger 7 and the required power of the on-vehicle electric device exceeds the limit of the power generation amount of the motor generator 16, the output of the electric supercharger 7 is set to be low in advance. By doing so, the driving force that can be actually generated with respect to the required driving force according to the driver's accelerator operation is reduced, but the power consumption of the power storage device 14 is suppressed and the system is robust in terms of power. Can be realized.

  Further, in the first embodiment described above, when the internal combustion engine driving force, which is the output torque of the internal combustion engine 1, reaches the target torque, the motor generator 16 is operated as a generator, and the generated electric power is used as the electric supercharger 7. However, there is a mechanical response delay until the internal combustion engine 1 is filled with the air compressed by the electric supercharger 7 and the internal combustion engine driving force reaches the target driving force. To do. Therefore, for a predetermined time after the electric supercharger reaches the predetermined rotational speed, the motor generator 16 is prohibited from changing to the power generation mode, and the internal combustion engine 1 is driven according to the rotational speed of the electric supercharger 7. Torque may be calculated. By doing so, it is possible to respond to the driver's required driving force without fluctuations in consideration of mechanical delay.

  In the hybrid vehicle shown in FIG. 1, the power storage device 14 is generally equipped with a DC / DC converter (not shown). The purpose of the DC / DC converter is to step down the voltage of the power storage device 14, which is a high voltage, to 12/14 [V] used in existing general vehicles, and to supply power to the in-vehicle electrical components. It is a thing. The details are not related to the present invention, so the description is omitted.

  In the first embodiment, the output of the above-described DC / DC converter may be stopped until the output torque of the internal combustion engine matches the driving force required by the driver. In this case, since the power consumption from the power storage device 14 is only the electric supercharger 7 and the motor generator 16, the power consumed by the DC / DC converter can be reduced, and thus the response to the required driving force can be further improved. It becomes.

  In the first embodiment, the output may be limited according to the temperature of the electric supercharger 7. Specifically, the temperature of the electric supercharger motor 11 that drives the electric supercharger 7 or the electric supercharger control device 13 that drives the electric supercharger motor 11 is detected, and the detected temperature is set to the detected temperature. Based on this, the electric supercharger motor is controlled so as to limit the output of the electric supercharger 7. By doing in this way, it becomes possible to protect the electric supercharger 7 from excessive overheating.

  Furthermore, in the first embodiment, the output of the electric supercharger 7 may be limited according to the temperature of the motor generator 16. Specifically, the temperature of the motor generator 16 or the MG control device 18 that drives the motor generator 16 is detected, and the output of the electric supercharger 7 is limited based on the detected temperature. By doing in this way, it becomes possible to protect the motor generator 16 or the MG control apparatus 18 from excessive overheating.

  In the first embodiment of the present invention, the first clutch 15 is provided between the motor generator 16 and the internal combustion engine 1, and the second clutch 17 is provided between the motor generator 16 and the transmission 19. However, the present invention can be applied to all types of hybrid systems including a motor that can be driven and regenerated with respect to the output of an internal combustion engine, such as a motor generator driven by a belt. It is.

  The battery used for the power storage device 14 is generally a lithium ion battery, but a nickel-metal hydride battery, a high voltage capacitor, or the like can also be used. The power storage device used in the present invention is, for example, a power storage device of 36 [V] or higher in Embodiment 1, but any power supply system having a function equivalent to that of the power storage device can be applied.

  In the present invention, the embodiments can be appropriately modified or omitted within the scope of the invention.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake air path 3 Air cleaner 4 Upstream path of electric supercharger 5 Intercooler 6 Throttle valve 7 Electric supercharger 8 Electric supercharger bypass valve 9 Bypass path 10 Compressor impeller 11 Electric supercharger motor 12 Intercooler passage 13 Electric supercharger control device 14 Power storage device 15 First clutch 17 Second clutch 16 Motor generator 18 MG control device 19 Transmission 20 Tire

Claims (10)

An electric supercharger disposed in an intake passage of the internal combustion engine; a motor generator driven by the driving force of the internal combustion engine to generate electric power or receive power supplied from a power storage device to assist the driving force of the internal combustion engine; A method for driving a hybrid vehicle including an electric supercharger, comprising an accelerator operation amount detection device that detects an accelerator operation amount of a driver,
Calculating the driver's required driving force based on at least the output of the accelerator operation amount detection device; and
A step of calculating electric power required to drive the electric supercharger based on the calculated required driving force;
A step of calculating a driving force of the motor-generator necessary to power by the electric power the operation the motor-generator,
The target driving force of the internal combustion engine is calculated so that a value obtained by subtracting the driving force of the motor generator from the driving force of the internal combustion engine, which is increased by supercharging by the electric supercharger, becomes the required driving force. Process,
With
When the required driving force is in a region where supercharging by the electric supercharger is necessary, the electric power generation of the motor generator is stopped, and the electric driving force of the internal combustion engine is assisted by the driving force of the motor generator. Drive the turbocharger,
After the driving force of the internal combustion engine reaches the target driving force, the motor generator is driven by the driving force of the internal combustion engine supercharged by the electric supercharger to generate electric power,
Driving the electric supercharger with the generated electric power;
A method for driving a hybrid vehicle including an electric supercharger. When driving the electric supercharger while assisting the driving force of the internal combustion engine with the driving force of the motor generator, at least one of the intake pressure of the internal combustion engine and the rotational speed of the electric supercharger Controlling the motor generator based on
A method for driving a hybrid vehicle comprising the electric supercharger according to claim 1. Controlling the motor generator based on the amount of electricity stored in the power storage device when driving the electric supercharger while assisting the driving force of the internal combustion engine with the driving force of the motor generator;
A method for driving a hybrid vehicle comprising the electric supercharger according to claim 1 or 2. When the rotational speed of the internal combustion engine is greater than a predetermined value, the assist by the motor generator is stopped.
A method for driving a hybrid vehicle comprising the electric supercharger according to any one of claims 1 to 3. Correcting the required driving force based on the amount of electrical load on the power storage device before driving the electric supercharger;
A method for driving a hybrid vehicle comprising the electric supercharger according to any one of claims 1 to 4. Calculate the target rotational speed of the electric supercharger according to the target driving force,
When driving the electric supercharger while assisting the driving force of the internal combustion engine with the driving force of the motor generator, the rotational speed of the electric supercharger becomes the calculated target rotational speed of the electric supercharger. Until reaching a predetermined time after reaching the motor generator,
A method for driving a hybrid vehicle comprising the electric supercharger according to any one of claims 1 to 5. When driving the electric supercharger while assisting the driving force of the internal combustion engine with the driving force of the motor generator, the rotational speed of the electric supercharger has reached the target rotational speed of the electric supercharger After that, until a predetermined time elapses, the output of the power storage device is stopped.
A method for driving a hybrid vehicle comprising the electric supercharger according to claim 6. Limiting the output of the electric supercharger based on at least one of the temperature of the electric motor driving the electric supercharger and the temperature of the inverter driving the electric motor;
A method for driving a hybrid vehicle comprising the electric supercharger according to any one of claims 1 to 7.   9. The output of the electric supercharger is limited based on at least one of a temperature of the motor generator and a temperature of an inverter that drives the motor generator. A method for driving a hybrid vehicle comprising the electric supercharger according to any one of the preceding claims. A hybrid vehicle is driven by using the driving method according to any one of claims 1 to 9.
A drive device for a hybrid vehicle including an electric supercharger.

Images