Vehicle having an electric machine and two onboard power subsystems

Patent metadata

Field	Value
Publication number	US-9908430-B2
Application number	US-201514801359-A
Country	US
Kind code	B2
Filing date	Jul 16, 2015
Priority date	Jan 17, 2013
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A vehicle with an N-phase electric motor, with a first onboard electrical subsystem and with a second onboard electrical subsystem, wherein the electric motor includes a rotor and a stator system, and the first onboard electrical subsystem includes an inverter. The stator system is associated with the inverter and the electric motor is operable with an inverter controller according to the principle of field-oriented control such that the stator system is embodied in a star circuit in which the star point can be connected to the second onboard electrical subsystem directly or via a star point switch. The inverter controller includes a current controller and a star point controller, wherein the current controller controls phase currents of the stator system and the star point controller controls a star point current.

First claim

What is claimed is:

1. A vehicle comprising:
an N-phase electric motor, including a rotor and a star circuit stator system with a star point;
a first onboard electrical subsystem having an inverter associated with the stator system;
a second onboard electrical subsystem connected to the star point via a star point switch; and
an inverter controller configured to operate the electric motor according to the principle of field-oriented control, the inverter controller including:
a current controller that controls phase currents of the stator system, and
a star point controller that controls a star point current in accordance with the following enhanced Clarke-Park transformation:

[

I
d

I
q

I
0

]

=

2
/
3

·

[

cos
⁡

(

β
el

)

cos
⁡

(

β
el

-

120
°

)

cos
⁡

(

β
el

+

120
°

)

-

sin
⁡

(

β
el

)

-

sin
⁡

(

β
el

-

120
°

)

-

sin
⁡

(

β
el

+

120
°

)

1
2

1
2

1
2

]

·

[

I
u

I
v

I
w

]

.

,

where I u , I v , and I w are measured phase currents, β el is an electrical angle of the rotor, Z p is a number of pole pairs of the electric motor, I d is field-building component, I q a torque-building component, and I 0 is a zero current component.

2. The vehicle as set forth in claim 1 , wherein the vehicle comprises one of (i) measurement means for measuring a number of at least N−1 phase currents and the star poi

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Gorka Matthias
• Reuss Joerg
• Findeisen Daniel
• Steinberger Michael

Classifications

• H02P21/10

  Direct field-oriented control; Rotor flux feed-back control · CPC title

• Y02T10/643

  Cross-Sectional Technologies · mapped topic

• Y02T10/641

  Cross-Sectional Technologies · mapped topic

• B60L15/02 Primary

  characterised by the form of the current used in the control circuit · CPC title

• Y02T10/7005

  Cross-Sectional Technologies · mapped topic