Power control apparatus for a turbo charger equipped with an assist motor and a motor driven turbo charging apparatus

• US 20050017672A1
• Filed: 07/21/2004
• Published: 01/27/2005
• Est. Priority Date: 07/25/2003
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Suzuki, Tamaki, Morita, Hisaharu, Fujitsuna, Masami
• Granted Patent: US 7,084,600 B2
• Time in Patent Office: Days
• US Class Current: 318/802
• CPC Class Codes: F02B 2037/122 Control of rotational speed of the pump
• CPC Class Codes: F02B 37/10 at least one pump being alternatively or simultaneously driven by exhaust and other drive, e.g. by pressurised fluid from a reservoir or an engine-driven pump
• CPC Class Codes: F02B 39/10 electric
• CPC Class Codes: H02P 27/06 using dc to ac converters or inverters H02P27/05 takes precedence
• CPC Class Codes: Y02T 10/12 Improving ICE efficiencies

Abstract

A power control apparatus includes an inverter giving a rectangular waveform drive signal to an induction motor, an inverter voltage controlling section controlling an output voltage of the inverter, a converter boosting a voltage supplied to the inverter, a converter voltage controlling section controlling an output voltage of the converter, and a control signal generating section that controls the inverter voltage controlling section in a low-rotational speed region and controls the converter voltage controlling section in a high-rotational speed region.

Claims

1. A power control apparatus for a motor-equipped turbo charger, comprising:

an inverter for giving a waveform drive signal to an induction motor driving a rotary shaft of a turbo charger in accordance with a rotational speed;

inverter voltage controlling means for controlling an output voltage of said inverter;

a converter for boosting a voltage supplied to said inverter; and

converter voltage controlling means for controlling an output voltage of said converter.

2. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, further comprising control signal generating section for performing a frequency control for increasing a frequency of said waveform drive signal in accordance with an increase of a target rotational speed of said induction motor, performing an inverter boosting control for increasing the output voltage of said inverter in accordance with an increase of the target rotational speed in a low-rotational speed region of said induction motor, and performing a converter boosting control for increasing the output voltage of said converter in accordance with an increase of the target rotational speed in a high-rotational speed region of said induction motor.

3. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein the waveform drive signal given to said induction motor has a rectangular waveform in an entire rotational speed region.

4. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein said inverter voltage controlling means controls an output voltage of said inverter based on a duty ratio control and said converter voltage controlling means controls an output voltage of said converter based a duty ratio control.

5. The power control apparatus for a motor-equipped turbo charger in accordance with claim 1, wherein said converter includes a multi-phase chopper type boosting circuit whose phase number is equivalent to a boosting ratio, each phase of which includes a choke coil connected to a battery power source and a converter transistor controlling power supply to said choke coil.

6. A motor driven turbo charging apparatus comprising:

a turbo charger;

a multi-phase induction motor for driving a rotary shaft of said turbo charger; and

a power supply circuit for supplying electric power to said induction motor, wherein

said power supply circuit comprises;

a converter circuit for boosting an input voltage;

an inverter circuit for converting an output voltage of said converter circuit into a multi-phase power and supplying said multi-phase power to said induction motor; and

said converter circuit is a multi-phase converter circuit.

7. The motor driven turbo charging apparatus in accordance with claim 6, wherein

said induction motor has a 6-phase winding;

said inverter circuit has a 6-phase bridge circuit including switching elements provided for respective phases; and

said converter circuit has a 6 or less-phase switching circuit including switching elements provided for respective phases.

8. The motor driven turbo charging apparatus in accordance with claim 6, wherein

said power supply circuit comprises:

a frequency control section for controlling a switching frequency of said inverter circuit,

an inverter voltage control section for controlling an output voltage of said inverter circuit by adjusting a switching duty ratio of said inverter circuit, and

a converter voltage control section for controlling an output voltage of said converter circuit by adjusting the switching of said converter circuit,

wherein

said inverter voltage control section and said converter voltage control section are arranged so as to increase respective output voltages in accordance with an increase of a rotational speed of said induction motor,

said inverter voltage control section controls the output voltage of said inverter circuit in a first rotational speed region, and said converter voltage control section controls the output voltage of said converter circuit in a second rotational speed region including a region higher than said first rotational speed region.