Dynamo-electric machine control system and vehicle driving system including the same

• US 20100026222A1
• Filed: 07/01/2009
• Published: 02/04/2010
• Est. Priority Date: 07/31/2008
• Status: Active Grant

• Current Assignee: Aisin AW Company Limited (Aisin Corp.)
• Original Assignee: Aisin AW Company Limited (Aisin Corp.)
• Inventors: Aoki, Kazuo, Yoshida, Takashi, Saha, Subrata, Izawa, Jin, Ogino, Daisuke
• Granted Patent: US 8,373,367 B2
• Time in Patent Office: Days
• US Class Current: 318/400.220
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60L 15/10 for automatic control superimposed on human control to limit the acceleration of the vehicle, e.g. to prevent excessive motor current electric devices for safety purposes B60L3/00
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: H02P 29/02 Providing protection against overload without automatic interruption of supply protection against faults of stepper motors H02P8/36
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A dynamo-electric machine control system including a dynamo-electric machine and an inverter that is interposed between a battery and the dynamo-electric machine and that controls a current flowing through the dynamo-electric machine, wherein a rotation speed and an output torque of the dynamo-electric machine are controlled by the inverter, the dynamo-electric machine control system includes a battery power deriving unit that derives a battery power to be supplied from the battery when the dynamo-electric machine is operated at the rotation speed and the output torque; a limit power determining unit that variably determines a limit power, which is a maximum allowable value of the battery power, in accordance with a battery voltage; and a torque limiting unit that limits the torque of the dynamo-electric machine such that the battery power derived by the battery power deriving unit does not exceed the limit power.

Claims

1. A dynamo-electric machine control system including a dynamo-electric machine and an inverter that is interposed between a battery and the dynamo-electric machine and that controls a current flowing through the dynamo-electric machine, wherein a rotation speed and an output torque of the dynamo-electric machine are controlled by the inverter, the dynamo-electric machine control system comprising:

a battery power deriving unit that derives a battery power to be supplied from the battery when the dynamo-electric machine is operated at the rotation speed and the output torque;

a limit power determining unit that variably determines a limit power, which is a maximum allowable value of the battery power, in accordance with a battery voltage; and

a torque limiting unit that limits the torque of the dynamo-electric machine such that the battery power derived by the battery power deriving unit does not exceed the limit power.

2. The dynamo-electric machine control system according to claim 1, wherein the limit power determining unit determines the smaller of a first limit power, which is set at a fixed value regardless of the battery voltage, and a second limit power, which is set such that a battery current remains smaller than a predetermined overcurrent threshold even when the battery voltage varies, as the limit power.

3. The dynamo-electric machine control system according to claim 2, wherein the second limit power is set on the basis of an integrated value of the overcurrent threshold and the battery voltage.

4. The dynamo-electric machine control system according to claim 3, wherein the first limit power and the second limit power are set by subtracting in advance a value corresponding to a control delay power, which is an increase in the battery power caused by a control delay relative to the dynamo-electric machine.

5. The dynamo-electric machine control system according to claim 2, further comprising a battery power variation rate deriving unit that derives a variation rate of the battery power,

wherein, during rapid variation in which the battery power variation rate derived by the battery power variation rate deriving unit is larger than a predetermined battery power rapid variation threshold, a rapid variation second limit power, which is set at a smaller value than the second limit power, is set instead of the second limit power.

6. The dynamo-electric machine control system according to claim 5, wherein, during the rapid variation, a rapid variation first limit power, which is set at a smaller value than the first limit power, is set instead of the first limit power.

7. The dynamo-electric machine control system according to claim 2, further comprising a rotation speed variation rate deriving unit that derives a variation rate in the rotation speed of the dynamo-electric machine,

wherein, during rapid variation in which the rotation speed variation rate derived by the rotation speed variation rate deriving unit is larger than a predetermined rotation speed rapid variation threshold, a rapid variation second limit power, which is set at a smaller value than the second limit power, is set instead of the second limit power.

8. The dynamo-electric machine control system according to claim 7, wherein, during the rapid variation, a rapid variation first limit power, which is set at a smaller value than the first limit power, is set instead of the first limit power.

9. A vehicle driving system comprising:

the dynamo-electric machine control system according to claim 1;

a first dynamo-electric machine and a second dynamo-electric machine serving as the dynamo-electric machine; and

a power transfer mechanism for distributing a driving force by a drive source other than the first dynamo-electric machine and the second dynamo-electric machine,

wherein one of the driving force distributed by the power transfer mechanism is transmitted to a vehicle wheel, another one of the driving force distributed by the power transfer mechanism is transmitted to the first dynamo-electric machine, and a driving force generated by the second dynamo-electric machine is transmitted to the vehicle wheel.

10. The vehicle driving system according to claim 9, wherein

the power transfer mechanism includes a planetary gear mechanism having, in order of rotation speed, a first rotary element, a second rotary element, and a third rotary element, and

the first dynamo-electric machine is connected to the first rotary element, the drive source other than the dynamo-electric machine is connected to the second rotary element, and the second dynamo-electric machine and the third rotary element are connected to the vehicle wheel.