Drive method and drive device for a hybrid vehicle

• US 8,731,755 B2
• Filed: 12/21/2011
• Issued: 05/20/2014
• Est. Priority Date: 12/22/2010
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Rauner, Thomas
• Primary Examiner(s): NGUYEN, TAN QUANG
• Application Number:
  US13/332,520
• Publication Number:
  US 20120166029A1
• Time in Patent Office: 881 Days
• Field of Search: 701/22, 701/54, 701/29, 701/51, 701/67, 701/69
• US Class Current: 701/22
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/52 Driving a plurality of drive axles, e.g. four-wheel drive
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A drive device for a hybrid vehicle, which has a first driven axle and a second driven axle, including: a first motor/generator unit, which is connected to the first driven axle; an internal combustion engine unit, which is connected in a rotationally fixed fashion to a differential/transmission unit which is connected to the rear axle; a second motor/generator unit, which is connected in a rotationally fixed fashion to the differential/transmission unit, parallel to the internal combustion engine unit; a clutch unit, which is designed to disconnect and connect a force flux between the differential/transmission unit and the second driven axle; and a control unit, which actuates the clutch unit, the internal combustion engine unit, the first motor/generator unit and the second motor/generator unit as a function of predefined operating states.

Claims

1. A drive device for a hybrid vehicle, which has a first driven axle and a second driven axle, comprising:

a first motor/generator unit, which is connected to the first driven axle;

an internal combustion engine unit, which is connected in a rotationally fixed fashion to a differential/transmission unit which is connected to the second driven axle;

a second motor/generator unit, which is connected in a rotationally fixed fashion to the differential/transmission unit, parallel to the internal combustion engine unit;

a clutch unit, which is configured to disconnect and connect a force flux between the differential/transmission unit and the second driven axle; and

a control unit, which actuates the clutch unit, the internal combustion engine unit, the first motor/generator unit and the second motor/generator unit as a function of predefined operating states.

2. The drive device as claimed in claim 1, wherein the first motor/generator unit comprises two electric machines which are each connected to wheels of the first driven axle.

3. The drive device as claimed in claim 1, wherein the clutch unit is embodied as a frictionally engaging clutch which is configured to be shifted by the control unit.

4. The drive device as claimed in claim 1, wherein the first motor/generator unit and the second motor/generator unit are each configured to be controlled by the control unit in a motor mode or in a generator mode.

5. A drive method for a hybrid vehicle, which has a first driven axle and a second driven axle, a first motor/generator unit which is connected to the first driven axle and a differential/transmission unit which is connected to the second driven axle and which is connected to an internal combustion engine unit and to a second motor/generator unit, said method comprising:

using a clutch unit to disconnect and connect a force flux between the differential/transmission unit and the second driven axle; and

using the control unit to actuate the clutch unit, the internal combustion engine unit, the first motor/generator unit and the second motor/generator unit as a function of predefined operating states.

6. The drive method as claimed in claim 5, wherein operating states of the drive device are activated by the control unit,

wherein, in a first operating state, when the internal combustion engine unit is switched on, the first motor/generator unit and the second motor/generator unit are operated by motor;

wherein, in a second operating state, when the internal combustion engine unit is switched on, the first motor/generator unit is operated as a generator and the second motor/generator unit is operated as a generator or motor;

wherein, in a third operating state, when the internal combustion engine unit is switched off, the first motor/generator unit is operated as a motor and the second motor/generator unit is operated as a generator;

wherein, in a fourth operating state, when the internal combustion engine unit is switched on, the first motor/generator unit is operated as a motor and the second motor/generator unit is operated as a generator.

7. The drive method as claimed in claim 6, wherein the drive method has a further operating state which is activated by the control unit, wherein, when the internal combustion engine unit is switched off, the first motor/generator unit and the second motor/generator unit are operated as generators.

8. The drive method as claimed in claim 5, wherein the drive method has a further operating state which is activated by the control unit, wherein, when the internal combustion engine unit is switched off, the first motor/generator unit is operated as a motor.

9. The drive method as claimed in claim 5, wherein the drive method has a further operating state which is activated by the control unit, wherein, when the internal combustion engine unit starts, the first motor/generator unit and the second motor/generator unit are operated as motors.

10. The drive method as claimed in claim 5, wherein the drive method has a further operating state, which is activated by the control unit, wherein, when the internal combustion engine unit is switched on, the first motor/generator unit is operated as a motor and the second motor/generator unit is operated as a motor or as a generator.

11. The drive method as claimed in claim 5, wherein the drive method has a first changeover of operating state, which permits a changeover from an operating state with a switched-off internal combustion engine unit to an operating state with a switched-on internal combustion engine unit, by operating the second motor/generator unit as a motor.

12. The drive method as claimed in claim 11, wherein the drive method has a second changeover of operating state, which permits a changeover from an operating state with a switched-off internal combustion engine unit to an operating state with a switched-on internal combustion engine unit by entraining the internal combustion engine unit.