# US 2014/0195079 A1 · Method and device for controlling the drive train of an electric vehicle

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- Number: US 2014/0195079 A1
- Document ID: US20140195079A1
- Status: Published application
- Kind: A1
- Application number: 13/736,103
- Filed: 2013-01-08
- Published: 2014-07-10
- Earliest claimed: 2013-01-08
- Assignees: Ford Global Technologies, LLC
- Applicants: Ford Global Technologies, LLC
- Inventors: Monika Derflinger; Arnulf Sponheimer; Roger Graaf; Marc Simon
- Web page: https://patentgrep.com/patent/US20140195079A1

## CPC

- B60L 15/2054: {by controlling transmissions or clutches}
- B60L 15/2045: {for optimising the use of energy}
- B60L 50/61: by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60L 2220/42: with use of more than one motor
- B60L 2240/12: Speed
- B60L 2240/14: Acceleration
- B60L 2240/421: Speed
- B60L 2240/423: Torque
- B60L 2260/28: Four wheel or all wheel drive
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/72: Electric energy management in electromobility
- Y10S 903/916: with plurality of drive axles
- Y10S 903/945: Characterized by control of gearing, e.g. control of transmission ratio
- Y10S 903/946: Characterized by control of driveline clutch
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

## Abstract

A method for controlling an electric vehicle drivetrain having least two drive units with wheels located on opposite axles are driven by respective drive units, includes in a first operating mode, the ratio of the torques provided by the drive units in each case for a given torque requirement is set taking into account the efficiency applicable to each drive unit under the given operating conditions, and in a second operating mode, the ratio of the torques provided by the drive units in each case for a given torque requirement is set independently of the efficiency applicable to each drive unit under the given operating conditions.

## Claims

### Claim 1

A method for controlling a drive train of an electric vehicle, wherein the drive train comprises at least two drive units and wherein at least two wheels arranged on different axles of the electric vehicle can be driven via different drive units, comprising:
in a first operating mode, a ratio of torques provided by the drive units in each case for a given torque requirement is set upon to taking into account efficiency applicable to each drive unit under current operating conditions; and
in a second operating mode, the ratio of torques provided by the drive units in each case for a given torque requirement is set independently of efficiency applicable to each drive unit under the current operating conditions.

### Claim 2 (depends on 1)

The method as claimed in claim 1, further comprising:
determining, for the first operating mode, the drive unit which has a maximum efficiency under the given operating conditions.

### Claim 3 (depends on 1)

The method as claimed in claim 1, further comprising deactivating one of the drive units in the first operating mode.

### Claim 4 (depends on 3)

The method as claimed in claim 3, wherein the drive unit is decoupled from the drive train while the drive unit is deactivated.

### Claim 5 (depends on 1)

The method as claimed in claim 1, wherein, in the second operating mode, power provided by the drive units is maximized.

### Claim 6 (depends on 1)

The method as claimed in claim 1, wherein the second operating mode is selected during one of a vehicle acceleration, launching the vehicle on an ascend grade, and or when vehicle speed exceeds a reference speed.