JP2969238B2 - Turbocharger with double row turbocharger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a turbocharger having a double row turbocharger.
More particularly, the present invention relates to a turbocharger having a double-row supercharger capable of recovering energy over the entire load range.

[0002]

2. Description of the Related Art In recent years, turbochargers for increasing the supercharging pressure by recovering the exhaust energy of an engine have been widely used. This type of turbocharger system uses a thermal energy of exhaust gas to apply a rotating force to a turbine,
Although this system drives the compressor with this rotational force, it is possible to use the engine as a heat-shielding structure so that heat energy can be used effectively. The exhaust energy cannot be effectively recovered for the entire region and load.

[0003] In order to solve such a drawback, a type in which a turbine and a compressor are connected in series has been developed. FIG. 3 shows the structure of this type of turbocharger. In FIG. 3, 101 is a first turbine, 20
Reference numeral 1 denotes a second turbine provided downstream thereof, which is connected by an exhaust pipe 300 therebetween. 103 is the first
Downstream of the second turbine 2
Numerals 03 are provided, and these are connected by an intake pipe 301. A first motor generator 104 is connected to a rotating shaft 102 connecting the first turbine 101 and the first compressor 103, and is rotated by the first turbine 101 to become a generator. Also, the motor 103 serves as an electric motor to apply a rotational force to the compressor 103. Second turbine 2
A second motor generator 204 is connected to a rotating shaft 202 connecting the first compressor 01 and the second compressor 203, and is rotated by a second turbine 201 to be a generator and also a motor. A rotational force is applied to the compressor 203.

[0004]

In the turbocharger having such a structure, the flow of the exhaust gas changes at a right angle.
When the turbocharger SS of the stage is arranged in series, the piping on the intake side and the exhaust side becomes extremely complicated, and there is a disadvantage that the space is extremely inefficient, the structure is complicated, and the cost is high. .

The present invention has been made in view of such a problem, and an object of the present invention is to improve the performance of a turbine driven by weak exhaust energy at the time of partial load of an engine, and to improve the efficiency of space. It is to provide a good multi-stage turbocharger.

[0006]

According to the first aspect of the present invention, a double-row supercharger in which the intake pressure is increased by a double-row supercharger rotated by the rotational force of a turbine driven by exhaust gas from an engine. In a turbocharger equipped with a machine,
A first stage turbine positioned at the uppermost stream of the exhaust flow path and rotationally driven by the exhaust gas; a motor generator connected to a rotating shaft of the first stage turbine; A second stage turbine provided downstream of the first stage turbine, a generator connected to a rotating shaft of the second stage turbine, and a centrifugal type driven by the rotating shaft of the first stage turbine A compressor and a permanent magnet which is disposed on an outer peripheral edge of the centrifugal compressor impeller and serves as a rotor of a second compressor and an impeller of a second compressor which supplies gas sent from the impeller in a radial direction from a rotation axis, A rotor rotatably held by a bearing rotatably supported on a rotating shaft of the first stage turbine, and having a stator coil, which is electromagnetically connected to a permanent magnet of the rotor to rotate the rotor. To give power Data with a double row supercharger, characterized by comprising: a child pole, a - Bocha - manager is provided. In the invention according to claim 2 of the present application, in addition to the invention according to claim 1, the second-stage turbine is formed separately from a structure including the first-stage turbine. A turbocharger having a double-row supercharger characterized by incorporating a power generator into a turbine shaft is provided. In the invention according to claim 3 of the present application, in addition to the invention according to claim 1, the first
The first compressor is operated by the first stage turbine driving force, and the second compressor is provided with a rotating force by an electromagnet facing a multipole body of a permanent magnet integrally installed,
A turbocharger having a double-row supercharger characterized by controlling the compression ratio of air to be large is provided.

[0007]

The first compressor drives the first compressor by the first-stage turbine, and the air compressed by the compressor is compressed by the second compressor provided with the driving means. The second stage turbine, which is formed separately from the structure including the first stage turbine, is driven by exhaust gas guided from the first stage turbine by an exhaust pipe. Generates power by driving force.

[0008]

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory view showing an embodiment of a turbocharger provided with a double-row supercharger according to the present invention. In FIG. 1, reference numeral 1 denotes a first-stage turbine. The turbine 1 has an exhaust inlet 3 and an impeller 5 connected to an exhaust port of an engine (not shown). 10 is a compressor. The compressor 10 has a first impeller 11 fixed to a rotating shaft 7 fixed to the impeller 5 of the first-stage turbine 1. The rotating shaft 7 has bearings 13 and 14
Are rotatably mounted on the case 15.

A rotating shaft 7 is provided with a motor generator 9 having a rotor 6 composed of a permanent magnet and a stator coil 8. On the compressor 10 side of the rotary shaft 7, a soft iron rotor 17 as shown in FIG.
It is rotatably supported with respect to. An outer periphery of the rotor 17 has an impeller 21 having a compression ratio in a shape having a compression ratio. Although not shown in FIG. 2, a plurality of permanent magnets 23 serving as rotating magnetic poles are arranged on the back surface in the circumferential direction. Have been. The magnetization direction of the permanent magnet 23 is the axial direction of the rotating shaft 7. Reference numeral 25 denotes a stator magnetic pole, and the stator magnetic pole 25 is provided with a stator coil 27 for generating a rotating magnetic flux.
When the rotor 17 is mounted on the rotating shaft 7, the impeller 17 is located on the outer periphery of the impeller 11. Reference numeral 30 denotes a second-stage turbine having an impeller 31 whose input side is connected to an outlet of the first-stage turbine 1 by an exhaust pipe 33 '. Rotary shaft 3 mounted on impeller
A generator rotor 35 is fixed to 3. The stator 35 is made of a permanent magnet. A stator coil 37 is disposed on the outer periphery of the rotor 35, and acts as a generator 39 by rotating the stator 35 by an impeller.

Reference numeral 40 denotes a drive motor, and its rotating shaft 41
, A pinion 43 is attached, this pinion 43 meshes with a gear provided on the rotating shaft of the engine (not shown),
Assists engine rotation during power running.

Reference numeral 50 denotes an electronic control unit, which uses a computer as its main component. Signals from various sensors provided inside the vehicle are input thereto. FIG. 1 shows only the input of the vehicle speed signal, the accelerator pedal depression amount signal, and the engine speed signal.

In the electronic control unit 50, in addition to the above-mentioned computer, the electric power generated by the motor generator 9 and / or the power generator 39 is rectified and stored in the battery 60, Power and battery 60
Motor for driving the rotor 17 using the electric power of the
It also includes a high-power circuit for controlling the driving of the power supply 40.

Next, an example of the operation of the above embodiment will be described. When the engine is rotating at a relatively low load and high speed, exhaust gas containing a large amount of exhaust energy is exhausted from the engine. The first stage turbine 1 is driven by this exhaust energy, and the generated rotational force causes the compressor 10 to rotate.
To compress the atmosphere and send it to the intake port of the engine for supercharging. When the energy recovered from the exhaust gas still remains, the motor generator 9 is operated as a generator, and the generated power is stored in the battery 60. When excess energy remains in the exhaust gas discharged from the first-stage turbine 1, the second-stage turbine 30 is driven to cause the generator 39 to generate electric power. The electric power is stored in the battery 60.

When the number of revolutions of the engine starts to decrease due to, for example, an uphill condition of the vehicle, the electronic control unit 50 detects this condition, and first stops the power generation of the motor generator 9, and the first stage Only the compressor 10 is driven by the torque of the turbine. If the rotation speed of the engine still decreases, power is supplied from a battery 60 or the like to the electric motor including the rotor 17 and the fixed magnetic pole 25 via the electronic control unit 50, and the rotor 17 is rotated by the compressor 10. The compressed air is further compressed by rotation of the impeller 21 and sent to the engine. When further intake is required, the motor generator 9 is driven by an electric motor to further enhance intake.

When the motor generator 9 and the generator 39 are performing full power generation, such as when traveling at high speed on a flat ground, the electronic control unit 50 converts the generated power to drive the motor. -Powering operation of the motor 40 to assist the driving force of the engine. The present invention is not limited to the above-described operation, and various combinations of operations of the components can be performed depending on the driving state of the vehicle.

Although the present invention has been described with reference to the above-described embodiment, various modifications are possible within the scope of the present invention, and these modifications are not excluded from the scope of the present invention.

[0018]

As described above, according to the present invention, the first stage
The first compressor is driven by the bin, and the air compressed by the compressor is compressed by the second compressor provided with the driving means, and is formed separately from the structure including the first stage turbine. The second-stage turbine is configured to be driven by the exhaust gas guided from the first-stage turbine by the exhaust pipe, so that the supercharging operation and the exhaust energy can be performed in any operation state of the vehicle. Since the collecting operation can be appropriately performed, the engine can be efficiently driven. In addition, the first and second compressors are arranged coaxially, and the second stage turbine is formed separately from the structure including the first stage turbine. The structure of the turbocharger can be made compact. Further, the present invention provides a centrifugal compressor in which a two-stage turbine is connected to an exhaust passage and driven by the first-stage turbine, and air compressed by the compressor is supplied to an outer peripheral edge of the centrifugal compressor impeller. And a permanent magnet serving as a rotor of an electric motor and a rotor of a second compressor, which supplies gas sent from the impeller in a radial direction from a rotation axis. A rotor rotatably held by a rotatably supported bearing; and a stator magnetic pole having a stator coil and electromagnetically connected to a permanent magnet of the rotor to apply a rotational force to the rotor. Therefore, in the present invention, the structure of the intake pipe of the compressor is simpler and more compact than that of the conventional compressor, and the piping space is reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a turbocharger provided with a double-row supercharger according to the present invention.

FIG. 2 is a perspective view of a rotor.

FIG. 3 is a configuration diagram illustrating an example of a conventional multi-stage turbocharger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... 1st stage turbine 5 ... Impeller 6 ... Rotor 7 ... Rotating shaft 8 ... Stator coil 9 ... Motor generator 10 ... Compressor 11 ... Impeller 17 ... Rotor 21 ... Impeller 23 ... Permanent magnet 25 ... Fixed magnetic pole 27 ... stator coil 30 ... second stage turbine 31 ... impeller 33 ... rotating shaft 39 ... generator 40 ... drive motor 50 ... electronic control unit 60 ... battery

Claims (3)

(57) [Claims] 1. A turbocharger provided with a double-row supercharger for increasing an intake pressure by a double-row supercharger rotated by the rotational force of a turbine driven by exhaust gas of an engine, the uppermost stream of an exhaust flow path. A first stage turbine that is rotationally driven by the exhaust gas, a motor generator connected to a rotating shaft of the first stage turbine, and a downstream side of the first stage turbine in the exhaust passage. A second stage turbine provided, a generator connected to a rotating shaft of the second stage turbine, a centrifugal compressor driven by a rotating shaft of the first stage turbine, The impeller of the second compressor, which is disposed on the outer peripheral edge of the compressor impeller and supplies gas sent from the impeller in a radial direction from the rotation axis, and a permanent magnet serving as a rotor of the electric motor. Ta A rotor rotatably held by a bearing rotatably supported on a rotation axis of a bin, and a stator having a stator coil and electromagnetically connected to a permanent magnet of the rotor to apply a rotational force to the rotor A turbocharger comprising a double-row turbocharger, comprising: a magnetic pole; 2. The turbine according to claim 1, wherein the second-stage turbine is formed separately from a structure including the first-stage turbine, and a power generator is incorporated in a turbine shaft. A turbocharger comprising the double-row supercharger according to claim 1. 3. The first compressor is operated by a first stage turbine driving force, and the second compressor is provided with a rotational force by an electromagnet facing a multipole body of permanent magnets installed integrally. 2. A turbocharger having a double row supercharger according to claim 1, wherein the turbocharger is controlled so as to increase an air compression ratio.