KR20100071548A - Hybrid system of a vehicle having two stepped pulley - Google Patents

Abstract

PURPOSE: A hybrid system of a vehicle equipped with a two stepped pulley is provided to increase the efficiency of the hybrid system with simplifying the structure by applying the two stepped pulley to an integrated starter-generator which functions as a starter and a generator of a vehicle. CONSTITUTION: A hybrid system of a vehicle equipped with a two stepped pulley comprises: a vehicle engine(100); an integrated starter-generator(200) which functions the function of a start motor and a generator with being connected to the engine; a pulley assembly(400) which is connected to the engine and the integrated starter-generator and comprises a first pulley part(410) and a second pulley part(420) having a different level difference; and a controller(500) which controls the engine, the integrated starter-generator, and the pulley assembly and controls so that the integrated starter-generator is driven by a drive motor.

Description

HYBRID SYSTEM OF A VEHICLE HAVING TWO STEPPED PULLEY}

The present invention relates to a hybrid system of a vehicle, and more particularly, a hybrid in which a two-stage pulley is applied to an integrated starter generator (ISG) to improve engine initial driving efficiency and simplify the structure. It is about the system.

Conventionally, vehicles including vehicles, commercial vehicles or heavy equipment are provided with a starter motor for starting the engine and a generator for producing electricity. In general, the starter motor is used to initially start (start up) the engine using the car battery power, and the generator is used to charge the car battery power using the power of the engine.

1 schematically shows the relationship between the engine 10, the starter motor 30 and a generator (alterator) 20 in a conventional vehicle. Of course, the structure and appearance of the actual engine 10, starter motor 30 and generator 20 may be different from FIG.

2 conceptually illustrates the relationship between the engine 10, the starter motor 30, and the generator 20 in the vehicle illustrated in FIG. 1.

The conventional engine 10 as shown in FIGS. 1 and 2 is initially driven (started) by the starter motor 30. When the initial driving is completed, the starter motor is not operated.

In addition, the alternator 20 is connected to the engine 10 by a belt 24 spanning the engine pulley 12 and the generator pulley 22 and at a constant speed ratio corresponding to the rotation of the engine 10. Electricity is generated while rotating, and the generated electricity is charged in a battery (not shown).

By the way, the conventional starter motor 30 as described above increases the number of revolutions of the engine 10 to a certain level to ignite the engine, but does not allow the engine speed to reach the idle speed. As a result, after the engine 10 is ignited, a large amount of fuel is consumed instantaneously to reach an idle state that is idle.

That is, in the case of a conventional starter motor, the engine crank shaft speed is increased to a certain level to enable the engine to ignite, but the engine does not reach the idling speed (idle speed) in addition to the ignition due to the limitation of the starter motor power. . As a result, the engine must be initially speeded up by the starter motor and then have to increase speed instantaneously to reach idle state, which consumes a lot of fuel instantaneously.

In order to remedy this problem, a method of increasing the capacity of the starter motor may be considered. In other words, it is possible to think of a method of reducing the fuel consumption by starting the engine in a stationary state using a starter motor as well as driving the engine until the engine reaches idle speed (idle speed). However, this requires an increase in the capacity of the starter motor, which not only increases costs but also increases space due to the increase in the number of connecting parts such as gears and bearings.

On the other hand, the starter motor and the generator have a different role, but looking at the principle is similar. In other words, the starter motor converts electrical energy into kinetic energy and rotates the crankshaft of the engine to perform initial driving (starting) of the engine. The generator converts rotational kinetic energy generated from the crankshaft of the engine into electrical energy and converts the electrical To charge the battery.

Therefore, in principle, motors and generators are the same in that they are devices that convert between electrical energy and kinetic energy. "), Also known as a combined motor generator.

The ISG is a system designed to perform the functions of the motor and the generator by integrating the starter motor and the generator into one. However, when the ISG is used as a motor and as a generator, its role and function are different. When performing each function, the function must be properly controlled at each time. Such control is not simple and such a control device is complicated in structure. Do.

The present invention is to solve this problem, it provides a hybrid system having a simple structure and efficient by applying a two-stage pulley to the ISG (integrated starter / generator) that serves as a starter motor and a generator of the vehicle.

In another aspect, the present invention provides a hybrid system capable of initial idle driving by using the ISG up to a predetermined section at the beginning of engine driving.

In order to achieve the above object, the present invention provides a hybrid system of a vehicle having a two-stage pulley.

Hybrid system of a vehicle according to an embodiment of the present invention, the vehicle engine (100); An integrated starter generator (ISG) 200 connected to the engine 100 to perform a function of a start motor and a generator; A pulley assembly 400 connected to the engine 100 and the ISG 200 and including a first pulley part 410 and a second pulley part 420 having different steps; And a controller 500 for controlling the engine 100, the ISG 200, and the pulley assembly 400.

Here, the controller 500 controls the ISG 200 to operate as a driving motor or a generator, and the first pulley unit 410 and the second when the ISG 200 operates as a driving motor. Any one of the pulleys 420 is operated, and when the ISG 200 is operated as a generator, a pulley is operated differently from when the ISG 200 is operated as a driving motor.

According to one embodiment of the present invention, the pulley assembly 400 includes: a first pulley shaft 110 extending from a drive shaft of the engine; A first pulley 111 and a second pulley 112 formed on the first pulley shaft 110; A second pulley shaft 210 extending from the driving shaft of the ISG 200; A third pulley 211 and a fourth pulley 212 formed on the second pulley shaft 210; A first belt 120 made of a closed loop for interlocking the first pulley 111 and the third pulley 211; And a second belt 220 that is a closed loop for interlocking the second pulley 112 and the fourth pulley 212.

Here, the first pulley 111 and the third pulley 211 connected by the first belt 120 form a first pulley part 410 and are connected by the second belt 220. It can be said that the second pulley 112 and the fourth pulley 212 form the second pulley part 420.

Pulley assembly 400 according to an example of the present invention is composed of a two-stage pulley including a first pulley 410 and a second pulley 420.

According to one embodiment of the present invention, the control unit 500, when the ISG 200 operates as a drive motor so that the tension is applied to the first belt 120, the power of the ISG 200 is the engine 100 When the ISG 200 operates the generator, tension is applied to the second belt 220 so that the power of the engine 100 is transmitted to the ISG 200.

According to another example of the present invention, the control unit 500, when the ISG 200 operates as a drive motor so that the tension is applied to the second belt 220 so that the power of the ISG 200 is the engine 100 ), And when the ISG 200 operates the generator, tension is applied to the first belt 120 so that power of the engine 100 is transmitted to the ISG 200.

According to an example of the present invention, an idle pulley is provided as a means for selectively applying tension to the first belt 120 and the second belt 220.

Specifically, the hybrid system according to the exemplary embodiment of the present invention is disposed between the first pulley 111 and the third pulley 211 and a position at which the tension is applied to the first belt 120 and a position not applied thereto. A first idle pulley 311 movable to; A second idle pulley 321 disposed between the second pulley 112 and the fourth pulley 212 and movable to a position where tension is applied to the second belt 220 and a position where no tension is applied; And an idle pulley driver 300 for driving the first idle pulley 311 and the second idle pulley 321.

The idle pulley driving unit 300 drives the first idler pulley 310 and the second idler pulley 320 under the control of the control unit 500, and thus the first idler pulley 310 and the second children. The pulley 320 may apply tension to the first belt 120 and the second belt 220, or may not apply tension. That is, the idle pulley driver 300 drives the first idler pulley 310 and the second idler pulley 320 to selectively apply tension to the first belt 120 and the second belt 220, respectively. Be sure to

That is, the controller 500 controls the idle pulley driving unit 300. When the ISG 200 operates as a driving motor, tension is applied to any one of the first belt 120 and the second belt 220. The ISG 200 is driven by driving the first idle pulley 311 or the second idle pulley 321 so that the power of the ISG 200 is transmitted to the engine. When the ISG 200 is driven by a different pulley than when the ISG 200 is operated as a drive motor, the power of the engine can be transmitted to the ISG 200 so that tension is applied to a belt different from that when the drive motor is operated. have.

For example, the control unit 500 controls the idle pulley driving unit 300 so that when the ISG 200 operates as a driving motor, the first idler pulley 311 to apply tension to the first belt 120. Drive the power of the ISG 200 to be transmitted to the engine 100, when the ISG 200 when the generator is driven to drive the second idle pulley 321 so that the tension is applied to the second belt 220 Power of the engine 100 may be transmitted to the ISG 200.

Alternatively, the controller 500 controls the idle pulley driving unit 300 to drive the second idle pulley 321 so that tension is applied to the second belt 220 when the ISG 200 operates as a driving motor. The power of the ISG 200 is transmitted to the engine 100, and when the ISG 200 operates a generator, the first idler pulley 311 is driven to apply tension to the first belt 120. Power of 100 may also be delivered to ISG 200 at all times.

According to the exemplary embodiment of the present invention, the idle pulley driving unit 300 is provided with idle pulley shafts 310 and 320, and the first idler pulley 311 is a first idler pulley shaft extending from the idle pulley driving unit 300. The second idler pulley 321 may be disposed at 310 and may be disposed on the second idler pulley shaft 320 extending from the idler pulley driver 300.

The idle pulley driving unit 300 includes a device for displacing the idle pulley shafts 310 and 320, and may be used as the device without limitation as long as the device can be displaced by receiving a signal from the control unit. According to an example of the present invention, the solenoids 301 and 302 may be used as a device for displacing the idle pulley shafts 310 and 320.

According to an example of the present invention, at least one of the second pulley 112 and the fourth pulley 212 is disposed on the same axis so that each of the second pulley 112 and the fourth pulley 212 can be used in a region having high efficiency when operating as the starter and the generator. The radius of the first pulley 111 and the third pulley 211 may be larger or smaller.

In addition, according to an example of the present invention, the second idler pulley shaft 320 may be positioned outside the rotational closed region of the first belt 120. Of course, the first idler pulley shaft 310 may be positioned outside the rotational closed region of the second belt 220.

According to an example of the present invention, since the ISG 200 uses a higher output than the conventional starter motor in the initial driving stage of the engine, when the ISG 200 operates as a driving motor, the engine 100 reaches an idle state. Until the engine can be driven.

In this case, fuel consumption can be reduced because the ISG is in charge of driving the vehicle in an initial operation section of the engine which consumes a lot of fuel.

As described above, according to the present invention, the engine may be driven using one ISG 200 in which a start motor and a generator are integrated into a conventional vehicle, and the battery may be charged again using energy of the engine. The overall structure is simple because it uses the belt to connect the engine and the ISG 200.

In addition, the use of the ISG 200 may generate a higher output power than the conventional start motor, so that the ISG 200 takes charge of driving the vehicle in the initial operation section of the engine that consumes a lot of fuel, thereby reducing fuel consumption. It can be effective.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of a hybrid system having a two-stage pulley according to the present invention.

As an embodiment of the invention Figure 3 schematically shows the structure of a hybrid system of a vehicle according to the invention. 6 illustrates a control relationship between the pulley and the belt in the hybrid system, and FIG. 7 illustrates an enlarged view of the pulley assembly 400 in FIG. 6.

3 and 6, a hybrid system of a vehicle having a two-stage pulley according to an example of the present invention includes a vehicle engine 100; An ISG 200 connected to the engine 100 to perform a function of a start motor and a generator; A pulley assembly 400 connected to the engine 100 and the ISG 200 and including a first pulley part 410 and a second pulley part 420 having different steps; And a controller 500 for controlling the engine 100, the ISG 200, and the pulley unit 400.

The pulley assembly 400, the first pulley shaft 110 extending from the drive shaft of the engine; A first pulley 111 and a second pulley 112 formed on the first pulley shaft 110; A second pulley shaft 210 extending from the driving of the ISG 200; A third pulley 211 and a fourth pulley 212 formed on the second pulley shaft 210; A first belt 120 made of a closed loop for interlocking the first pulley 111 and the third pulley 211; And a second belt 220 that is a closed loop for interlocking the second pulley 112 and the fourth pulley 212.

Here, the first pulley 111 and the third pulley 211 connected by the first belt 120 form a first pulley part 410 and a second connected by the second belt 220. The pulley 112 and the fourth pulley 212 form a second pulley 420 of the pulley.

The control unit 500 includes a motor control unit (MCU) 510, an inverter 520, a DC / DC converter 530, and a vehicle control unit (VCU) 550, It also includes a battery 600.

In addition, the hybrid system according to the present invention includes an idle pulley as a means for selectively applying tension to the first belt 120 and the second belt 220, as shown in Figure 3 the first pulley ( A first idle pulley 311 disposed between the first pulley and the third pulley 211 and movable to a position where tension is applied to the first belt 120 and a position where no tension is applied; And a second idle pulley 321 disposed between the second pulley 112 and the fourth pulley 212 and movable to a position where tension is applied to the second belt 220 and a position where no tension is applied. have.

The hybrid system includes an idle pulley driver 300 as a means for driving the first idler pulley 311 and the second idler pulley 321, wherein the idle pulley driver 300 of the control unit 500 Under control, the first idler pulley 310 and the second idler pulley 320 are driven, so that the first idler pulley 310 and the second idler pulley 320 are respectively the first belt 120. And to apply tension to the second belt 220 or not to apply tension.

FIG. 4 conceptually illustrates the idle pulley operating in the hybrid system shown in FIG. 3 to tension the belt, and FIG. 5 illustrates the idle pulley operating in the hybrid system shown in FIG. 3 to tension the belt. It is a conceptual illustration of what to do. This figure is a schematic diagram that distinguishes the movement of the belt in an actual engine. In actual operation, only one idle pulley selectively operates among the first idle pulley 310 and the second idle pulley 320.

The idle pulley is changed in position by an idle pulley driving unit 300 controlled by the control unit 500, the control unit 500 controls the ISG 200 to operate as a drive motor or a generator, When the ISG 200 operates as a driving motor, one of the first pulley part 410 and the second pulley part 420 is operated. When the ISG 200 operates as a generator, the ISG 200 operates as a generator. ), Make sure that the pulley is operated differently than when operating as drive motor.

In the embodiment according to FIGS. 3 and 6, when the ISG 200 operates as a driving motor, tension is applied to the first belt 120 so that power of the ISG 200 is transmitted to the engine 100. When the ISG 200 operates a generator, tension is applied to the second belt 220 so that power of the engine 100 is transmitted to the ISG 200.

If the driving of the idle pulley is controlled differently from the above embodiment, when the ISG 200 operates as a driving motor, tension is applied to the second belt 220 so that the power of the ISG 200 is driven by the engine. When the ISG 200 is operated, the tension is applied to the first belt 120 so that the power of the engine 100 is transmitted to the ISG 200. Of course.

6 and 7, the first idler pulley 311 is disposed on the first idler pulley shaft 310 extending from the idler pulley driving unit 300 and the second idler pulley 321. Is disposed on the second idler pulley shaft 320 extending from the idle pulley driving unit 300.

The idle pulley driving unit 300 includes a device for displacing the idle pulley shafts 310 and 320. Any device that can be displaced by receiving a signal from the controller can be used without limitation. In this embodiment, a solenoid is used as a device for displacing the idle pulley shafts 310 and 320.

That is, the idle pulley driving unit 300 includes a first solenoid 301 and a second solenoid 302, so that the first solenoid 301 and the second solenoid 302 according to the command of the controller 500. Displacement of the first idler pulley 311 and the second idler pulley 321 may be controlled by displacing the first idler pulley shaft 310 and the second idler pulley shaft 320, respectively.

At least one of the second pulley 112 and the fourth pulley 212 may be disposed on the same axis to facilitate the operation of the first idler pulley 311 and the second idler pulley 321. The radius of the first pulley 111 and the third pulley 211 can be made larger, in the embodiment according to FIGS. 3 to 6 the fourth pulley 212 is larger than the second pulley 112. In addition, the second idle pulley shaft 320 is located outside the rotational closed region of the first belt 120.

In the hybrid system according to the present invention, the engine 100 is idle when the ISG 200 operates as a driving motor because the ISG 200 uses a higher output than the conventional starter motor in the initial driving stage of the engine. The engine can be driven until the condition is reached. In this case, fuel consumption can be reduced because the ISG is in charge of driving the vehicle in an initial operation section of the engine which consumes a lot of fuel.

Embodiments of the present invention have been described above with reference to the accompanying drawings. However, it is obvious that the scope of the present invention is not limited to the above embodiments, and various other modifications may be derived based on the above embodiments, all of which are within the scope of the present invention.

1 schematically illustrates the relationship between the engine 10, the starter motor 30 and the generator 20 in a conventional vehicle.

2 is a conceptual diagram conceptually showing the relationship between the engine 10, the starter motor 30, and the generator 20 in the conventional vehicle shown in FIG.

3 schematically illustrates the structure of a hybrid system of a vehicle having a two-stage pulley according to an example of the present invention.

FIG. 4 conceptually illustrates the idle pulley operating to tension the belt in the hybrid system shown in FIG. 3.

FIG. 5 schematically shows the idle pulleys acting to tension the belt in the hybrid system shown in FIG. 3. This figure is a schematic diagram that distinguishes the movement of the belt in an actual engine.

6 is a relation diagram illustrating a pulley motion control relationship in a hybrid system according to an example of the present invention.

FIG. 7 is an enlarged view of the pulley assembly 400 and its periphery in FIG. 6.

<Brief Description of Drawings>

10: engine 12: engine pulley

20: alternator 22: generator pulley

24: belt 30: starter motor

100: engine 110: first pulley shaft

111: first pulley 112: second pulley

120: first belt 200: integrated starter generator (ISG)

210: second pulley shaft 211: third pulley

212: fourth pulley 220: second belt

300: idle pulley drive unit 301: the first solenoid

302: second solenoid 310: first idler pulley shaft

311: 1st children pulley 320: 2nd children pulley axis

321: second idler pulley 400: pulley assembly

410: first pulley portion 420: second pulley portion

500: control unit 510: MCU (Motor Control Unit)

520: inverter 530: DC / DC converter

550: Vehicle Control Unit (VCU)

600: battery

Claims (12)

A vehicle engine 100; An integrated starter generator (ISG) 200 connected to the engine 100 to perform a function of a start motor and a generator; A pulley assembly 400 connected to the engine 100 and the ISG 200 and including a first pulley part 410 and a second pulley part 420 having different steps; And And a controller 500 for controlling the engine 100, the ISG 200, and the pulley assembly 400. The controller 500 controls the ISG 200 to operate as a drive motor or a generator, and when the ISG 200 operates as a drive motor, the first pulley part 410 and the second pulley part. Any one of the 420 is operated, and when the ISG 200 is operated as a generator, a pulley part that is different from when the ISG 200 is operated as a driving motor is operated. . The method of claim 1, wherein the pulley assembly 400, A first pulley shaft 110 extending from the drive shaft of the engine; A first pulley 111 and a second pulley 112 formed on the first pulley shaft 110; A second pulley shaft 210 extending from the driving of the ISG 200; A third pulley 211 and a fourth pulley 212 formed on the second pulley shaft 210; A first belt 120 made of a closed loop for interlocking the first pulley 111 and the third pulley 211; And And a second belt 220 formed as a closed loop for interlocking the second pulley 112 and the fourth pulley 212. Here, the first pulley 111 and the third pulley 211 connected by the first belt 120 form a first pulley part 410 and a second connected by the second belt 220. The pulley (112) and the fourth pulley (212) is a hybrid system of a vehicle, characterized in that the pulley forms a second pulley (420). The method of claim 2, wherein the control unit 500, When the ISG 200 operates as a driving motor, tension is applied to the first belt 120 so that the power of the ISG 200 is transmitted to the engine 100, and the ISG 200 operates a generator. When the tension is applied to the second belt (220), the hybrid system of the vehicle, characterized in that the power of the engine (100) is transmitted to the ISG (200). The method of claim 2, wherein the control unit 500, When the ISG 200 is operated as a driving motor, tension is applied to the second belt 220 so that the power of the ISG 200 is transmitted to the engine 100, and the ISG 200 is operated by a generator. When the tension is applied to the first belt (120), the hybrid system of the vehicle, characterized in that the power of the engine (100) is transmitted to the ISG (200). The method of claim 1, A first idle pulley 311 disposed between the first pulley 111 and the third pulley 211 and movable to a position where tension is applied to the first belt 120 and a position where no tension is applied; A second idle pulley 321 disposed between the second pulley 112 and the fourth pulley 212 and movable to a position where tension is applied to the second belt 220 and a position where no tension is applied; And The first idler pulley 310 and the second idler pulley 320 are driven under the control of the control unit 500, so that the first idler pulley 310 and the second idler pulley 320 are respectively made of the first idler pulley 310 and the second idler pulley 320. An idle pulley driving unit 300 to apply tension to the first belt 120 and the second belt 220 or not to apply tension; Hybrid system of a vehicle further comprising. The method of claim 5, The control unit 500 controls the idle pulley driving unit 300, When the ISG 200 operates as a driving motor, the first idler pulley 311 or the second idler pulley 321 is driven so that tension is applied to any one of the first belt 120 and the second belt 220. To transmit the power of the ISG 200 to the engine, When the ISG 200 operates the generator, the ISG 200 drives an idle pulley different from when the ISG 200 operates as the drive motor so that tension is applied to a belt different from that when the ISG 200 operates as the drive motor. So that power of the engine is transmitted to the ISG (200). The method of claim 5, wherein the control unit 500 controls the idle pulley driving unit 300, When the ISG 200 operates as a driving motor, the first idler pulley 311 is driven to apply tension to the first belt 120 so that the power of the ISG 200 is transmitted to the engine 100. When the ISG 200 operates the generator, the second idler pulley 321 is driven so that tension is applied to the second belt 220 so that power of the engine 100 is transmitted to the ISG 200. Hybrid system of a vehicle. The method of claim 5, wherein the control unit 500 controls the idle pulley driving unit 300, When the ISG 200 operates as a driving motor, the second idler pulley 321 is driven to apply tension to the second belt 220 so that the power of the ISG 200 is transmitted to the engine 100. When the ISG 200 operates the generator, the first idler pulley 311 is driven to apply tension to the first belt 120 so that the power of the engine 100 is transmitted to the ISG 200. Hybrid system of a vehicle. The method of claim 5, The first idler pulley 311 is disposed on the first idler pulley shaft 310 extending from the idler pulley driving unit 300. The second idler pulley 321 is disposed on the second idler pulley shaft 320 extending from the idler pulley driver 300. Hybrid system of the vehicle, characterized in that. The method of claim 4, wherein At least one of the second pulley 112 and the fourth pulley 212 is larger or smaller in radius than the corresponding first pulley 111 or the third pulley 211 disposed on the same axis. Hybrid system of a vehicle engine with a two-stage pulley. 11. The hybrid system of claim 10, wherein the second idler pulley shaft (320) is located outside the rotational closed area of the first belt (120). The hybrid system of any one of claims 1 to 11, wherein when the ISG 200 operates as a driving motor, the engine 100 is driven until the engine 100 reaches an idle state. .

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