Hybrid propulsion system comprising shiftable clutches provided for a motor vehicle

• US 6,705,416 B1
• Filed: 10/17/2001
• Issued: 03/16/2004
• Est. Priority Date: 04/19/1999
• Status: Expired due to Fees

• Current Assignee: BMW AG (Bayerische Motoren Werke AG), ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Sich, Bernhard, Gumpoltsberger, Gerhard, Dreibholz, Ralf, Kaindl, Markus, Glonner, Hans, Domian, Hans-Jörg, Michael, Jörg
• Primary Examiner(s): Johnson, Brian L.
• Assistant Examiner(s): KLEBE, GERALD B
• Application Number:
  US09/959,092
• Time in Patent Office: 881 Days
• Field of Search: 180/65.2, 180/65.3, 180/65.4, 180/65.6, 180/65.7, 180/65.8, 475/5
• US Class Current: 180/65.23
• CPC Class Codes: B60K 1/02 comprising more than one electric motor
• CPC Class Codes: B60K 2006/268 Electric drive motor starts the engine, i.e. used as starter motor
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• CPC Class Codes: B60L 2240/441 Speed
• CPC Class Codes: B60L 2240/486 Operating parameters
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/023 Fluid clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/1015 Input shaft speed, e.g. turbine speed
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: F02N 11/003 said electric motor being also used as a drive for auxiliaries, e.g. for driving transmission pumps or fuel pumps during engine stop
• CPC Class Codes: F02N 11/006 using a plurality of electric motors
• CPC Class Codes: F16H 61/0025 Supply of control fluid; Pumps therefore
• CPC Class Codes: F16H 61/0028 using a single pump driven by different power sources
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/946 Characterized by control of driveline clutch

Abstract

A hybrid drive for a motor vehicle which possesses, in a gear train (1), a first electrical machine (4) located between an internal combustion motor (2) and a multi-gear vehicle transmission (3). The hybrid drive further possesses a second electrical machine (6) permanently connected with an input shaft (5) of the transmission. First and second clutches (7, 8), respectively, are placed between the first and second electrical machines (4, 6) and the internal combustion motor (2) and the first and second electrical machines (4, 6) can be respectively driven as either a motor or a generator.

Claims

1. A hybrid drive for a motor vehicle with a drive train (1) comprising:

an internal combustion motor (2) for driving a vehicle transmission (3) with changeable gear ratios, the hybrid drive having a first electric machine (4) located in a drive flow path between the internal combustion motor (2) and the vehicle transmission (3) and the hybrid drive further having a second electrical machine (6) also located in the drive flow path between the internal combustion motor (2) and the vehicle transmission (3),

a first clutch (7) located between the first electrical machine (4) and the internal combustion motor (2);

a second clutch (8) being located between the second electrical machines (6) and the internal combustion motor (2), and the first and second electric machines (4) can be driven as a motor and as a generator; and

wherein the second electrical machine (6) is permanently connected with a transmission input shaft (5) to rotate therewith.

2. The hybrid drive in according to claim 1, wherein the first clutch (7), the first electrical machine (4), the second clutch (8) and the second electrical machine (6) are each sequentially arranged in series along the input drive train (1) in a direction leading away from the internal combustion motor (2).

3. The hybrid drive according to claim 1, wherein the first clutch (7) and the first electrical machine (4) are arranged in a parallel side train (9), between the internal combustion motor (2) and the second clutch (8), branching from the transmission input drive train (1), the first electrical machine (4) is separatable from the internal combustion motor (2) by the first clutch (7), and the second electrical machine (6) is separatable from the internal combustion motor (2) by the second clutch (8).

4. The hybrid drive according to claim 1, wherein the first electrical machine (4) is connected with a hydraulic pump (10) of the vehicle transmission (3).

5. The hybrid drive according to claim 4, wherein the hydraulic pump (10) is located between the first clutch (7) and the first electrical machine (4), whereby the hydraulic pump (10) can be one of mechanically driven by the internal combustion motor (2) and electrically driven by the first electrical machine (4).

6. The hybrid drive according to claim 1, wherein the first electrical machine (4) is provided for starting the internal combustion motor (2) when the first clutch (7) is one of in an engaged and in a partial slip condition.

7. The hybrid drive according to claim 1, wherein the second electrical machine (6) is provided for electrically starting the hybrid drive from a rest position.

8. The hybrid drive according to claim 1, wherein the second clutch (8) couples the internal combustion motor (2) to the input shaft (5) of the transmission (3) only once a rotational speed difference, between a rotational speed of the internal combustion motor (2) and a rotational speed of the input shaft (5), is less than a specified threshold value.

9. The hybrid drive according to claim 1, wherein the second clutch (8) couples the internal combustion motor (2) to the input shaft (5) of the transmission (3) only once a rotational speed difference, between a rotational speed of the internal combustion motor (2) and a rotational speed of the input shaft (5), is approaching zero.

10. The hybrid drive according to claim 1, wherein, in case of a traction requirement in excess of a specified threshold, the internal combustion motor (2), which is connected with the first electrical machine (4) via the first clutch (7), is coupleable with the transmission input shaft (5) and with the second electrical machine (6) when the second clutch (8) shifts to an engaged condition.

11. The hybrid drive according to claim 1, wherein second electrical machine (6) is engages as a starter when a temperature of the internal combustion motor (2) is below a predefined threshold temperature.

12. The hybrid drive according to claim 1, wherein, by means of an electronic power circuit (11), the first and second electrical machines (4 and 6) are one of connected together with one another and are connected with a source of electrical energy.

13. The hybrid drive according to claim 12, wherein the first electrical machine (4) can be one of driven with current supplied by the source of electrical energy (12) and driven via the electronic power circuit (11) with current from the second electrical machine (6), and the second electrical machine (6) operates as a generator when the second clutch (8) is shifted to one of an open state and a slipping condition.

14. The hybrid drive according to claim 13, wherein the source of electrical energy is a battery (12).

15. The hybrid drive according to claim 12, wherein the first electrical machine (4) is driven as a generator when the second clutch (8) is in one of a closed condition and a slipping condition.

16. The hybrid drive according to claim 1, wherein at least one of the first clutch (7) and the second clutch (8) is a positive engagement clutch.

17. The hybrid drive according to claim 1, wherein at least one associated power take-off is connected to a drive of the first electrical machine (4).

18. The hybrid drive according to claim 1, wherein the second electrical machine (6) has a power capacity which is greater than a power capacity of the first electrical machine (4).

19. The hybrid drive according to claim 1, wherein the vehicle transmission is an automatic transmission (3).

20. A hybrid drive for a motor vehicle with a drive train (1) comprising an internal combustion motor (2) for driving a vehicle transmission (3) with changeable gear ratios, the hybrid drive having a first electric machine (4) located in a drive flow path between the internal combustion motor (2) and the vehicle transmission (3) and the hybrid drive further having a second electrical machine (6) also located in the drive flow path between the internal combustion motor (2) and the vehicle transmission (3), and first and second clutches (7, 8) being respectively located between the first and second electrical machines (4, 6) and the internal combustion motor (2), and the first and second electric machines (16) can be driven as a motor and as a generator;

wherein the second electrical machine (6) is permanently connected with a transmission input shaft (5) to rotate therewith; and

wherein the first electrical machine (4) is connected with a hydraulic pump (10) of the vehicle transmission (3), the hydraulic pump (10) is located between the first clutch (7) and the first electrical machine (4), whereby the hydraulic pump (10) can be one of mechanically driven by the internal combustion motor (2) and electrically driven by the first electrical machine (4).