High-voltage pinion starter

Patent metadata

Field	Value
Publication number	US-9593658-B2
Application number	US-201313860062-A
Country	US
Kind code	B2
Filing date	Apr 10, 2013
Priority date	Apr 11, 2012
Publication date	Mar 14, 2017
Grant date	Mar 14, 2017

Abstract

A vehicle is provided with a pinion starter for an internal-combustion engine, which vehicle includes a low-voltage onboard power supply system and a high-voltage onboard power supply system. The pinion starter has an electric motor and a solenoid switch, wherein the electric motor is constructed as a polyphase machine. The polyphase machine can be supplied with electric power from the high-voltage onboard power supply system, and the solenoid switch can be electrically supplied by the low-voltage onboard power supply system.

First claim

What is claimed is:

1. A vehicle having an internal-combustion engine, comprising:
a pinion starter comprising an electric motor and a solenoid switch, the pinion starter being operatively configured to start the internal-combustion engine;
a low-voltage onboard power supply system;
a high-voltage onboard power supply system, wherein:
the electric motor is a polyphase machine, the polyphase machine is supplyable with electric power from the high-voltage onboard power supply system,
the solenoid switch is supplyable with electric power from the low-voltage onboard power supply system, and
the high-voltage onboard power supply system is galvanically isolated from the low-voltage onboard power supply system.

2. The vehicle according to claim 1 , wherein the pinion starter comprises a power electronics unit, the power electronics unit being operatively configured to control the polyphase machine.

3. The vehicle according to claim 2 , wherein:
the high-voltage onboard power supply system supplies the power electronics unit with electric power, and
the power electronics unit inverts the electric power from the high-voltage onboard power supply system.

4. The vehicle according to claim 2 , further comprising:
a control device operatively configured to communicate with the power electronics unit, wherein:
the power electronics unit and the control device are directly connected to the solenoid switch.

5. The vehicle according to claim 3 , further comprising:
a control device operatively configured to communicate with the power electronics unit, wherein:
the power electronics unit and the control device are directly connected to the solenoid switch.

6. The vehicle according to claim 4 , wherein:
the control device is operatively configured to determine when a rotational speed of the internal-combustion engine and a rotational speed of the polyphase machine are synchronized, and
the power electronics unit signals the solenoid switch to engage a pinion of the pinion starter in a motor gear ring when the rotational speed of the polyphase machine is synchronized with the rotational speed of the internal-combustion engine.

7. The vehicle according to claim 5 , wherein:
the control device is operatively configured to determine when a rotational speed of the internal-combustion engine and a rotational speed of the polyphase machine are synchronized, and
the power electronics unit signals the solenoid switch to engage a pinion of the pinion starter in a motor gear ring when the rotational speed of the polyphase machine is synchronized with the rotational speed of the internal-combustion engine.

8. The vehicle according to claim 2 , wherein the power electronics unit is constructed with a galvanic isolation.

9. The vehicle according to claim 3 , wherein the power electronics unit is constructed with a galvanic isolation.

10. The vehicle according to claim 4 , wherein the power electronics unit is constructed with a galvanic isolation.

11. The vehicle according to claim 6 , wherein the power electronics unit is constructed with a galvanic isolation.

12. The vehicle according to claim 2 , wherein the power electronics unit and the polyphase machine are air-cooled.

13. The vehicle according to claim 1 , wherein the polyphase machine is an asynchronous polyphase machine.

14. The vehicle according to claim 1 , wherein the vehicle is a hybrid vehicle, cold starts, warm starts and reflex starts of the internal-combustion engine of the hybrid vehicle being carried out by the pinion starter.

15. A pinion starter for an internal-combustion engine of a vehicle having a low-voltage onboard power supply system and a high-voltage onboard power supply system, comprising:
an electric motor operatively configured as a polyphase machine;
a solenoid switch operatively configured to engage and disengage a pinion of the pinion starter, wherein:
the polyphase machine is supplyable with electric power from the high-voltage onboard power supply system,
the solenoid switch is supplyable with electric power from the low-voltage onboard power supply system, and
the high-voltage onboard power supply system is galvanically isolated from the low-voltage onboard power supply system.

16. The pinion starter according to claim 15 , further comprising:
a power electronics unit operatively configured to control the polyphase machine.

17. The pinion starter according to claim 16 , wherein the power electronics unit is supplyable with electric power from the high-voltage onboard power supply system, and inverts said electric power.

18. The pinion starter according to claim 16 , further comprising:
a control device operatively configured to communicate with the power electronics unit, wherein the power electronics unit and the control device are directly connected to the solenoid switch.

19. The pinion starter according to claim 18 , wherein:
the control device is operatively configured to determine when a rotational speed of the internal-combustion engine and a rotational speed of the polyphase machine are synchronized, and
the power electronics unit is operatively configured to signal the solenoid switch to engage the pinion of the pinion starter in a motor gear ring of the internal-combustion engine when the rotational speed of the polyphase machine is synchronized with the rotational speed of the internal-combustion engine.

20. A vehicle having an internal-combustion engine, comprising:
a pinion starter comprising an electric motor and a solenoid switch, the pinion starter being operatively configured to start the internal-combustion engine;
a low-voltage onboard power supply system;
a power electronics system: and
a high-voltage onboard power supply system, wherein:
the electric motor is a polyphase machine,
the low-voltage onboard power supply system is directly connected to the solenoid switch,
the high-voltage onboard power supply system is directly connected to the power electronics system so that the power electronics system supplies the polyphase machine with an inverted current received from the high voltage onboard power supply system, and
the solenoid: i) is directly connected to the low-voltage onboard power supplysystem and to the power electronics system, and ii) is electrically uncoupled from the high-voltage onboard power supply system.

21. The vehicle according to claim 1 , further comprising:
a power electronics system; and
a control device that transmits a rotational speed of the internal-combustion engine and a rotational speed of gear teeth to the power electronics system, wherein the low-voltage onboard power supply system is directly connected to the control device.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Proebstle Hartmut
• Mahmoud Sherif

Classifications

• F02N11/0866

  comprising several power sources, e.g. battery and capacitor or two batteries · CPC title

• F02N11/087 Primary

  Details of the switching means in starting circuits, e.g. relays or electronic switches · CPC title

• F02N2011/0896

  Inverters for electric machines, e.g. starter-generators · CPC title