Multi-axle hybrid drive system for a vehicle

• US 8,448,730 B2
• Filed: 11/05/2009
• Issued: 05/28/2013
• Est. Priority Date: 11/19/2008
• Status: Expired due to Fees

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Muller, Axel Michael, Borntrager, Kai
• Primary Examiner(s): PHAN, HAU VAN
• Application Number:
  US13/123,741
• Publication Number:
  US 20110287888A1
• Time in Patent Office: 1,300 Days
• Field of Search: 180/65.28, 180/65.51, 180/65.285, 180/65.1, 180/65.225, 180/65.245, 180/65.27, 180/65.235
• US Class Current: 180/65.235
• CPC Class Codes: B60K 6/442 Series-parallel switching type
• 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: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2200/18 Buses
• CPC Class Codes: B60L 2220/44 Wheel Hub motors, i.e. integrated in the wheel hub
• CPC Class Codes: B60L 2270/145 Structure borne vibrations
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: B60Y 2200/143 Busses
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

A multi-axle hybrid drive system for a vehicle which comprises a first unit (4) with an internal combustion engine (5), a separator clutch and a semi-automatic gearshift transmission (6) that is associated with a first, mechanically driven axle (7) of the vehicle. At least one further unit (10), with either wheel-hub motors (8) or with a conventional electric axle drive in combination with an electric machine, such that, in each case, a unit (10) is associated with a respective electrically driven axle (9) of the vehicle. During a gearshift, the vehicle (1) can be driven by the unit (10) associated with the electrically driven axle (9) such that the traction force interruption, occurring in the semi-automatic gearshift transmission (6) during a gearshift, is compensated.

Claims

1. A multi-axle hybrid drive system for a an articulated bus (1), the multi-axle hybrid drive system comprising:

a first unit (4) having an internal combustion engine (5), a separator clutch and a semi-automatic gearshift transmission (6) all associated with a first, mechanically driven axle (7) of the articulated bus (1) for supplying drive thereto; and

at least one further unit (10) with one of wheel-hub motors (8) and a conventional electric axle drive in combination with an electric machine such that the at least one further unit (10) being associated with a respective electrically driven axle (9) of the articulated bus (1);

wherein during a gearshift, the articulated bus (1) is drivable by the at least one further unit (10), associated with the electrically driven axle (9), such that any traction force interruption, occurring in the semi-automatic gearshift transmission (6) during the gearshift, is compensated;

during a gearshift, recuperation is effected by the at least one further unit (10) associated with the electrically driven axle (9);

an energy accumulator (12) is provided for accumulating enemy; and

the mechanically driven axle (7) is an axle of a rear coach (3) of the articulated bus (1) and the at least one electrically driven axle (9) is an axle of a front coach (2) of the articulated bus (1).

2. The multi-axle hybrid drive system for the articulated bus (1) according to claim 1, wherein the first unit (4) is a parallel hybrid and comprises an electric machine (11) arranged on a primary side.

3. The multi-axle hybrid drive system for the articulated bus (1) according to claim 1, wherein the energy accumulator (12) is included as part of the first unit (4).

4. The multi-axle hybrid drive system for the articulated bus (1) according to claim 2, wherein the at least one further unit (10) comprises a conventional electric axle drive in combination with an electric machine, and current is supplied to the at least one further unit (10) and the recuperation is effected by the electric machine (11) of the first unit (4) arranged on the primary side.

6. The multi-axle hybrid drive system for the articulated bus (1) according to claim 1, wherein the energy accumulator (12) is included as part of the at least one further unit (10).

5. A multi-axle hybrid drive system for an articulated bus (1) comprising a front coach (2) and a rear coach (3), the drive system comprising:

a first unit (4) comprising an internal combustion engine (5), a separator clutch and a semi-automatic gearshift transmission (6) for mechanically driving a first axle (7) of the vehicle;

a second unit (10) comprising a second axle (9) being coupled to and electrically driven by one wheel-hub motors (8) and a combination of a conventional electric axle drive (9) and an electric machine;

an energy accumulator (12) being connected to both the first unit (4) and the second unit (10), and the first unit (4) charging the energy accumulator (12) when the semi-automatic gearshift transmission (6) is engaged and the internal combustion engine (5) is operating;

the rear coach (3) being pivotally coupled to the front coach (2), and the second unit (10) being supported by the front coach (2) and the first unit (4) being supported by the rear coach (3);

the second unit (10) driving the vehicle (1) with the electrically driven axle (9) when traction force, from the semi-automatic gearshift transmission (6) to the first axle (7), is interrupted during a gearshift of the semi-automatic gearshift transmission (6); and

the second unit (10) charging the energy accumulator (12) when traction force from the semi-automatic gearshift transmission (6) to the first axle (7) being interrupted during a gearshift of the semi-automatic gearshift transmission (6).