Drive system for a plug-in hybrid motor vehicle

• US 8,571,739 B2
• Filed: 06/28/2012
• Issued: 10/29/2013
• Est. Priority Date: 06/29/2011
• Status: Active Grant

• Current Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Original Assignee: Dr Ing hc F Porsche AG (Volkswagen AG)
• Inventors: Fleckner, Marco, Lederer, Matthias, Roth, Martin, Klick, Andre
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): ALHARBI, ADAM MOHAMED
• Application Number:
  US13/536,134
• Publication Number:
  US 20130006462A1
• Time in Patent Office: 488 Days
• Field of Search: None
• US Class Current: 701/22
• CPC Class Codes: B60K 6/485 Motor-assist type
• CPC Class Codes: B60L 15/20 for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
• CPC Class Codes: B60L 2240/423 Torque
• CPC Class Codes: B60L 50/16 with provision for separate direct mechanical propulsion
• CPC Class Codes: B60L 53/14 Conductive energy transfer
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• 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 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2540/215 Selection or confirmation of options
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 50/082 Selecting or switching between different modes of propelling
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/7072 Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y02T 90/14 Plug-in electric vehicles

Abstract

A drive system for a plug-in hybrid motor vehicle, having an internal combustion engine, an electric motor, a high-voltage source, in particular a high-voltage battery which has a minimum setpoint state of charge, a generator, a clutch, at least one transmission, at least one drive axle and a control unit, with the internal combustion engine being mechanically connected to at least one drive axle, with a first drive mode, “depleting mode”, and a second drive mode, “sustaining mode”, being provided in the control unit, with a third drive mode, “increasing mode”, which can be manually activated being provided, said third drive mode providing a load point increase at the internal combustion engine in such a way that the high-voltage source can be charged during driving and therefore the first drive mode can be activated.

Claims

1. A drive system for a plug-in hybrid motor vehicle, having an internal combustion engine, an electric motor, a high-voltage source, comprising a high-voltage battery which has a minimum setpoint state of charge, a generator, a clutch, at least one transmission, at least one drive axle and a control unit, with the internal combustion engine being mechanically connected to at least one drive axle, with a first drive mode, “

depleting mode”

, and a second drive mode, “

sustaining mode”

, being provided in the control unit, wherein a third drive mode, “

increasing mode”

, which can be manually activated is provided, said third drive mode providing a load point increase at the internal combustion engine in such a way that the high-voltage source can be charged during driving and therefore the first drive mode can be activated.

2. The drive system as claimed in claim 1, wherein the third drive mode can be activated only when the degree of efficiency of charging of the internal combustion engine, high-voltage source and electric motor is greater than or equal to a definable degree of efficiency.

3. The drive system as claimed in claim 1, wherein an automatic start/stop system is provided, with the limits for the start/stop operation of the internal combustion engine being coupled to the relationship between the setpoint state of charge and the actual state of charge of the energy storage means.

4. The drive system as claimed in claim 1, wherein the second drive mode can be manually activated.

5. A method for operating a drive system as claimed in claim 1, with the first drive mode being automatically activated when the high-voltage source is fully charged, and with the second drive mode being automatically activated when the minimum setpoint state of charge is reached, wherein the third drive mode is manually activated during the first or second drive mode in order to increase the load point of the internal combustion engine and to charge the high-voltage source.

6. The method for operating a drive system as claimed in claim 5, wherein the second drive mode is activated during the first or third drive mode in order to use the high-voltage source as a buffer storage means.