METHOD FOR CHARGING A BATTERY OF A HYBRID VEHICLE AT REST

• US 20090149290A1
• Filed: 12/04/2008
• Published: 06/11/2009
• Est. Priority Date: 12/05/2007
• Status: Abandoned Application

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Wallner, Stefan, Amann, Notker
• Application Number:
  US12/327,949
• Publication Number:
  US 20090149290A1
• Time in Patent Office: Days
• US Class Current: 475/149
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60K 6/48 Parallel type
• CPC Class Codes: B60L 50/15 with additional electric power supply with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61
• CPC Class Codes: B60L 53/00 Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
• CPC Class Codes: B60W 10/02 including control of driveline 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 10/196 acting within the driveline, e.g. retarders
• 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 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 30/18136 Engine braking
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• 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 90/14 Plug-in electric vehicles

Abstract

A method for charging a battery connected to an electric machine in a vehicle having an electrodynamic drive system including an electric machine and a planetary gearset. A crankshaft of the internal combustion engine is connected with a first element of the planetary gearset, the electric machine with a second element of the planetary gearset and a transmission input shaft with another element of the planetary gearset. A friction clutch detachably connects two elements of the planetary gearset, such that when the clutch is engaged, the planetary gearset runs in locked operation and when the internal combustion engine is running and the clutch is disengaged, a gear in the transmission is engaged to charge the battery via the combustion engine. The combustion engine drives the rotor of the electric machine with the transmission ratio of the planetary gearset.

Claims

1-2. -2. (canceled)

3. A method for charging a battery connected to an electric machine in a parallel hybrid vehicle at rest which comprises an electrodynamic drive system (1) including the electric machine (2) and a planetary gearset (3), a crankshaft (4) of an internal combustion engine of the vehicle being connected with a first element (5) of the planetary gearset (3), the electric machine (2) being connected with a second element (6) of the planetary gearset (3) and a transmission input shaft (7) being connected with a third element (8) of the planetary gearset (3), and a friction clutch (9), which connects two of the first element (5), the second element (6) and the third element (8) of the planetary gearset (3) in a releasable manner such that, when the friction clutch (9) is engaged, the planetary gearset (3) operates in blocked condition, the method comprising the steps of:

disengaging the friction clutch (9) of the planetary gearset (3) while the internal combustion engine of the vehicle is operating; and

engaging a gear of the transmission (10) such that the combustion engine drives a rotor (11) of the electric machine (2) with a transmission ratio of the planetary gearset (3) and charges the battery.

4. The method according to claim 3, further comprising the steps of:

connecting the crankshaft (4) of the combustion engine, via a damping device (12), to the first element which is a ring gear (5) of the planetary gearset (3);

connecting the rotor (11) of the electric machine (2) to the second element which is a sun gear (6) of the planetary gearset (3);

connecting the transmission input shaft (7) to the third element which is a carrier (8) of the planetary gearset (3); and

connecting the sun gear (6) and the carrier (8) of the planetary gearset (3) with the friction clutch (9) in a releasable manner.

5. A method for charging a battery coupled to an electric machine (2) in a parallel hybrid vehicle having an electrodynamic drive system (1), when an internal combustion engine is operating and the vehicle is at rest, the method comprising the steps of:

coupling a crankshaft (4) of the internal combustion engine to a ring gear (5) of the planetary gearset (3) via a damping device (12);

coupling a rotor (11) of the electric machine (2) to a sun gear (6) of the planetary gearset (3);

coupling a carder (8) of the planetary gearset (3) to an input shaft (7) of a transmission (10) of the vehicle;

enabling releasable coupling between the sun gear (6) of the planetary gearset (3) and the carrier (8) of the planetary gearset (3), via a clutch (9), such that when the clutch (9) is engaged, the sun gear (6) of the planetary gearset (3) and the carrier (8) of the planetary gearset (3) are fixed with respect to each other; and

driving the rotor (11) of the electric machine (2) with the internal combustion engine at a transmission ratio of the planetary gearset (3) by disengaging the clutch (9) and engaging a gear in the transmission (10) of the vehicle to charge the battery coupled to the electric machine (2).

6. A method for charging a battery connected to an electric machine in a parallel hybrid vehicle at rest which comprises an electrodynamic drive system (1) including the electric machine (2) and a planetary gearset (3), a crankshaft (4) of an internal combustion engine of the vehicle being connected with a ring gear (5) of the planetary gearset (3), the electric machine (2) being connected with a sun gear (6) of the planetary gearset (3) and a transmission input shaft (7) being connected with a carrier (8) of the planetary gearset (3), and a friction clutch (9), which connects two of the ring gear (5), the sun gear (6) and the carrier (8) of the planetary gearset (3) in a releasable manner such that, when the friction clutch (9) is engaged, the planetary gearset (3) operates in blocked condition, the method comprising the steps of:

disengaging the friction clutch (9) of the planetary gearset (3) while the internal combustion engine of the vehicle is operating; and

engaging a gear of the transmission (10) such that the combustion engine drives a rotor (11) of the electric machine (2) with a transmission ratio of the planetary gearset (3) and charges the battery.