Method for carrying out a tractive-force interrupted shifting in a parallel hybrid vehicle

• US 8,196,688 B2
• Filed: 08/08/2008
• Issued: 06/12/2012
• Est. Priority Date: 08/16/2007
• 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: Wallner, Stefan
• Primary Examiner(s): Restifo, Jeffrey J
• Assistant Examiner(s): Gurari, Erez
• Application Number:
  US12/671,137
• Publication Number:
  US 20100200318A1
• Time in Patent Office: 1,404 Days
• Field of Search: 180 6521- 6529
• US Class Current: 180/65.265
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60K 6/547 the transmission being a stepped gearing
• CPC Class Codes: B60L 15/2054 by controlling transmissions or clutches
• CPC Class Codes: B60L 2240/421 Speed
• 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 10/11 Stepped gearings
• 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 2510/244 Charge state
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 2710/081 Speed
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F16H 2061/0422 by an electric machine, e.g. by accelerating or braking the input shaft
• CPC Class Codes: F16H 2306/48 Synchronising of new gear
• CPC Class Codes: F16H 61/0403 Synchronisation before shifting
• 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 method of carrying out a shift operation with traction force interruption during hybrid operation when the electric machine has failed or the energy accumulator is full in a parallel hybrid vehicle having an automated transmission. During an upshift, the power inverter, connected to the electric machine, is actuated with an active short-circuit whereby a torque is generated, at the electric machine, which is used for synchronizing the transmission input.

Claims

1. A method of carrying out a shift operation, when one of an electric machine has failed or an energy accumulator is full, in a parallel hybrid vehicle having an automated transmission with traction force interruption during hybrid operation, the method comprising the steps of:

during an upshift, generating torque with the electric machine for synchronizing a transmission input by connecting a power inverter, which is actuated with an active short-circuit, to the electric machine; and

braking an internal combustion engine, for load reduction, by actuating the power inverter with an active short-circuit and which is connected to the electric machine, if the internal combustion engine is coupled to the electric machine during the load reduction, to synchronize a transmission input with a torque generated by the electric machine.

2. A method of shifting an automated transmission parallel hybrid vehicle with traction force interruption during hybrid operation when either an electric machine has failed or an energy accumulator is full, the hybrid vehicle comprising an internal combustion engine coupled to the electric machine, a power inverter being coupled to the electric machine, and the automated transmission being coupled, via a transmission input, to the electric machine, the method comprising the steps of:

upshifting the automated transmission by actuating the power inverter with an active short-circuit to generate torque with the electric machine for synchronizing the transmission input;

coupling the internal combustion engine with the electric machine and appropriately controlling the internal combustion engine to synchronize the transmission input for downshifting the automated transmission; and

braking the internal combustion engine to reduce torque, via the electric machine, on the transmission input and a currently engaged gear by actuating the power inverter with an active short-circuit to synchronize the transmission input with torque generated at the electric machine, if the internal combustion engine is coupled to the electric machine.

3. The method of carrying out a shift operation according to claim 2, further comprising the step of braking the internal combustion engine, for load reduction, by actuating the power inverter with an active short-circuit and which is connected to the electric machine, if the internal combustion engine is coupled to the electric machine during the load reduction, to synchronize a transmission input with a torque generated by the electric machine.