KR100897083B1 - Driving system of hybrid electric vehicle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive system and method for a motor-generator integrated hybrid vehicle, in particular using a dual clutch connected to receive engine rotational force, inserting a generator into a vehicle driving motor, and inserting a generator into a shaft of the motor. A drive system of a motor-generator integrated hybrid vehicle in which a motor shaft, which is an external shaft, and an generator shaft, which is an inner shaft, are connected to a dual clutch with the shaft of the generator inserted, thereby connecting the two shafts to an engine via a dual clutch, and using the same. A driving method of a hybrid vehicle.

Hybrid, motor, generator, integrated, dual clutch, EV, series, parallel,

Description

Driving system and method for a motor-generator hybrid vehicle {Driving system of hybrid electric vehicle}

The present invention relates to a drive system and method of a hybrid vehicle, and more particularly, to a vehicle drive system and a driving method comprising an engine and a motor, a generator, a power transmission means therebetween in a hybrid vehicle.

In general, a hybrid vehicle in a broad sense means driving a vehicle by efficiently combining two or more different power sources, but in most cases, driving power is driven by an engine powered by a fuel and a motor driven by battery power. It means a vehicle to obtain, which is called a hybrid electric vehicle (HEV).

In response to the recent demand for improving fuel economy and developing more environmentally friendly products, research on hybrid electric vehicles is being actively conducted.

Hybrid electric vehicles can form various structures by using engines and motors as power sources. Most of the vehicles studied so far employ either parallel or series.

In series, the engine and the motor are directly connected, and the structure is simpler and the control logic is simpler than the parallel type, but the mechanical energy from the engine is stored in the battery. In contrast, the parallel type has the disadvantage of being relatively complicated and the control logic is more complicated than the serial type. However, the mechanical energy of the engine and the energy of the battery can be used simultaneously. to be.

The conventional linear and parallel hybrid vehicle structure is a type in which the engine 11, the generator 12, and the motor 14 are connected by planetary gears 15 and 16, as shown in Figs.

That is, a plurality of planetary gears 15 and 16 are used for power transmission between the engine 11, the generator 12, the motor 14, and the drive shaft 17, and as a result, the vehicle driving and power transmission structure is very high. It is a complicated structure.

In particular, due to the complicated hardware configuration, the power train control strategy has to be very complicated accordingly, and thus, the existing vehicle driving system needs to be improved.

Therefore, the present invention is invented to solve the above problems, the motor shaft and the inner shaft in the state in which the generator is inserted into the vehicle driving motor, and the shaft of the generator is inserted into the shaft of the motor. A motor-generator integrated hybrid vehicle having a simpler structure than a conventional complicated structure in which a motor and a generator are connected to a planetary gear by connecting a generator shaft, which is an axis, to a dual clutch, and the two shafts, which are connected to the engine via the dual clutch. Its purpose is to provide a drive system and method.

In order to achieve the above object, the present invention is a drive system of a hybrid vehicle equipped with an engine, a generator, a battery, and a vehicle driving motor, the dual clutch is connected to the engine shaft, the generator and the motor structurally A motor-generator integrated hybrid, which is integrally coupled and is connected to the dual clutch so that the generator shaft and the motor shaft are selectively connected to the engine shaft, while the motor shaft is directly connected to the wheel drive shaft by the gear means. Provides a drive system for a vehicle.

In a preferred embodiment, the generator shaft and the motor shaft is connected to the first clutch and the second clutch of the dual clutch, respectively, with the generator shaft as the inner shaft and the motor shaft as the outer shaft with the generator inserted into the motor. do.

On the other hand, the present invention, the engine, the generator, the battery, the vehicle driving motor, the dual clutch having the first clutch and the second clutch connected to the engine shaft is mounted, the generator shaft is inserted into the motor into the generator shaft A method of driving a hybrid vehicle in which an external shaft is connected to an engine shaft via a first clutch and a second clutch of a dual clutch, and the motor shaft is directly connected to a wheel driving shaft by a gear means.

An EV mode in which the motor is driven by battery power while the first clutch and the second clutch are open, and the vehicle is driven only by the motor rotation force;

A series hybrid mode in which the vehicle is driven by a motor rotational force driven by a motor rotational force driven by a generator shaft connected to the first clutch while the first clutch is closed and the second clutch is opened;

The first clutch is opened and the second clutch is closed, so that the engine rotational force is transmitted to the motor shaft connected to the second clutch, and the motor is driven by battery power to drive the vehicle by the engine rotational force and the motor rotational force. ;

It provides a method of driving a motor-generator integrated hybrid vehicle comprising a.

In a preferred embodiment, the battery is charged with a part of the generated power of the generator in a series hybrid mode in which the first clutch is closed and the second clutch is opened.

According to the driving system of the present invention described above, the dual clutch is connected to receive the engine rotational force, and the generator is inserted into the vehicle driving motor, and the shaft of the generator is inserted into the shaft of the motor. By connecting the motor shaft, which is an axis, and the generator shaft, which is an inner shaft, to the dual clutch, the two shafts are connected to the engine via the dual clutch, which is simpler than the conventional complicated structure in which the motor and the generator are connected to the planetary gear. The structure makes it possible to configure a drive system for a hybrid vehicle.

In addition, the motor rotational force is configured to be transmitted directly to the wheel through the differential device, so it operates in the EV mode at the start / low speed by using the motor characteristic that can generate high torque at low speed (low rpm), and in the case of power shortage at the medium / high speed The motor shaft can be connected to the engine via a clutch (parallel) to satisfy the lack of power, allowing the vehicle to run without the need for a separate transmission. This provides a very advantageous advantage in vehicle packaging.

For ordinary driving, it is possible to improve fuel efficiency by running in EV or in series hybrid mode, and to implement the parallel hybrid mode that delivers engine power directly to the wheel axle when additional power is required, which compensates for the disadvantages of the series hybrid type. have.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 is a diagram illustrating a hybrid vehicle driving system according to the present invention. The present invention is a simplified system using a dual clutch of an existing direct and parallel type power train structure, which is easy to apply to a vehicle. It has advantages.

Looking at the configuration, the dual clutch (11a) is directly connected to the engine shaft to receive the engine rotational force, two shafts (inner shaft and the inner shaft and the rotational force input from the engine 11 using two clutches (C1, C2) External shaft) 12a, 14a.

More specifically, two output shafts, that is, concentric inner shaft 12a and outer shaft 14a are connected to the dual clutch 11a to which the engine torque is input, and the first clutch C1 of the two clutches has an inner shaft ( At 12a), the second clutch C2 is connected to the hollow outer shaft 14a.

At this time, the generator 12 is inserted into the motor 14 so that the motor 14 and the generator 12 are integrated, and the generator shaft is inserted into the motor shaft so that the generator shaft is connected to the dual clutch 11a. The inner shaft 12a is connected, and the motor shaft is an outer shaft 14a connected to the dual clutch 11a.

In addition, the generator 12 is not connected to the vehicle wheel, and the wheel shaft 19 is an external motor which is a motor shaft through a differential device 18, a drive shaft (hereinafter referred to as a wheel drive shaft) 17 and a gear means 17a. It is connected to the shaft 14a.

Referring to the operation state of each drive mode in the drive system of the present invention as follows.

4 is a view showing an operation state of the electric vehicle (EV) mode, which is a pure electric vehicle mode using only the rotational force of the motor. As is well known, the EV mode is a driving mode selected at start or in an engine inefficient section (low speed section). Thus, the vehicle driving force is obtained only by the motor 14 driven by the electric power of the battery 13.

Since the efficiency of the engine is lower than the efficiency of the motor at the initial start, it is advantageous in terms of fuel efficiency of the vehicle to start the initial start of the vehicle using a highly efficient motor.

In this EV mode, both the first and second clutches C1 and C2 of the dual clutch 11a are opened, and energy is obtained from the battery 13 and the motor 14 is transmitted to the wheel.

In the case of the regenerative braking mode, the operating state of the dual clutch is the same as in the EV mode of FIG. 4, and the energy flow is opposite to that of the EV mode, so that the power produced by the regenerative braking is charged to the battery.

5 is a view illustrating an operating state of the serial hybrid mode, in which the serial hybrid mode is a mode used in normal driving, and the first clutch C1 of the dual clutch 11a is closed and the second clutch C2 is open. do.

When the first clutch C1 is operated, the rotational force of the engine shaft is transmitted to the generator 12 through the internal shaft 12a (the engine implements an optimal operating state), and the power generated by the generator 12 is transmitted to the motor 14. Is provided to drive the motor, and the rotational force of the motor 14 is transmitted to the wheel shaft 19 to drive the vehicle.

Of course, some of the power generated by the generator 12 may be charged in the battery 13.

Next, Figure 6 is a view showing the operating state of the parallel hybrid mode, the parallel hybrid mode is a mode that is selected when the medium / high speed, lack of power.

In the parallel hybrid mode, the engine 11 and the motor 14 are driven simultaneously to transmit power to the wheels (the engine RPM is controlled by the generator), and the motor 14 is driven by battery power, and the dual clutch 11a ), The first clutch C1 is opened and the second clutch C2 is closed.

When the first clutch C2 is operated, engine rotational force is transmitted to the outer shaft 14a through the dual clutch 11a, and the respective wheels are transmitted through the gear means 17a, the wheel drive shaft 17, and the differential device 18. The rotational force of the motor 14 driven at the same time as the shaft 19 and driven by battery power is transmitted directly to the wheel drive shaft 17 and the wheel shaft 19 through the outer shaft 14a which is the motor shaft.

As a result, the engine 11 and the motor 14 simultaneously transmit power to the wheels.

In this manner, in the present invention, both the EV mode and the direct and parallel hybrid modes can be selected and implemented.

1 and 2 is a view showing a drive system of a conventional direct, parallel hybrid vehicle,

3 is a configuration diagram of a hybrid vehicle drive system according to the present invention;

4 is a view showing an operating state of the EV mode in the present invention,

5 is a view showing the operating state of the serial hybrid mode in the present invention,

Figure 6 is a view showing the operating state of the parallel hybrid mode in the present invention.

<Explanation of symbols for the main parts of the drawings>

11: engine 11a: dual clutch

12: generator 12a: generator shaft

13: battery 14: motor

14a: motor shaft 17: wheel drive shaft

17a: gear means 18: differential device

19: wheel shaft C1: first clutch

C2: second clutch

Claims (4)

In a drive system for a hybrid vehicle equipped with an engine 11, a generator 12, a battery, and a motor 14 for driving a vehicle, A dual clutch 11a connected to the engine shaft is provided, and the generator 12 and the motor 14 are structurally integrally coupled so that the generator shaft 12a and the motor shaft 14a are selectively connected to the engine shaft. A drive system for a motor-generator hybrid vehicle, characterized in that the motor shaft (14a) is connected directly to the wheel drive shaft (17) by a gear means (17a) while being connected to a dual clutch (11a). The method according to claim 1, With the generator 12 inserted into the motor 14, the generator shaft 12a and the motor shaft 14a are the dual shafts, and the generator shaft 12a and the motor shaft 14a are the dual shafts. A drive system for a motor-generator integrated hybrid vehicle, characterized in that it is connected to a first clutch (C1) and a second clutch (C2) of the clutch (11a), respectively. The engine, generator, battery, vehicle driving motor, dual clutch having the first clutch and the second clutch and connected to the engine shaft are mounted, and the generator shaft is inserted into the motor and becomes the internal shaft and the external shaft motor. A shaft is connected to an engine shaft via a first clutch and a second clutch of a dual clutch, and the motor shaft is a driving method of a hybrid vehicle directly connected to a wheel drive shaft by a gear means, An EV mode in which the motor is driven by battery power while the first clutch and the second clutch are open, and the vehicle is driven only by the motor rotation force; A series hybrid mode in which the vehicle is driven by a motor rotational force driven by a motor rotational force driven by a generator shaft connected to the first clutch while the first clutch is closed and the second clutch is opened; The first clutch is opened and the second clutch is closed, so that the engine rotational force is transmitted to the motor shaft connected to the second clutch, and the motor is driven by battery power to drive the vehicle by the engine rotational force and the motor rotational force. ; Method of driving a motor-generator integrated hybrid vehicle comprising a. The method according to claim 3, And a part of the generated power of the generator is charged to a battery in a series hybrid mode in which the first clutch is closed and the second clutch is opened.

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