# US 7,609,011 B2 · Electric force transmission device

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- Number: US 7,609,011 B2
- Document ID: US7609011B2
- Status: Granted
- Kind: B2
- Application number: 11/659,073
- Filed: 2005-08-02
- Published: 2008-12-04
- Granted: 2009-10-27
- Earliest claimed: 2004-08-02
- Assignees: Nissan Motor Co., Ltd.
- Inventors: Kazuo Yatabe; Yuusuke Minagawa; Tomoya Imazu
- Web page: https://patentgrep.com/patent/US7609011B2

## CPC

- B60W 20/30: Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)}
- B60K 6/365: with the gears having orbital motion
- B60K 6/445: Differential gearing distribution type
- B60K 6/448: Electrical distribution type
- B60K 6/547: the transmission being a stepped gearing
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- B60K 1/02: comprising more than one electric motor
- B60L 2240/421: Speed
- B60L 2240/423: Torque
- B60L 2240/441: Speed
- B60L 2240/486: Operating parameters
- B60L 2260/167: of motors or generators
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- B60W 2510/0604: Throttle position
- B60W 2510/0638: Engine speed
- B60W 2510/244: Charge state
- B60W 2520/10: Longitudinal speed
- B60W 2540/10: Accelerator pedal position
- B60W 2710/081: Speed
- B60W 2710/083: Torque
- B60W 2710/1038: Output speed
- F16H 3/727: {with at least two dynamo electric machines for creating an electric power path inside the gearing, e.g. using generator and motor for a variable power torque path}
- F16H 2037/103: {Power-split transmissions with each end of a CVT connected or connectable to a planetary gear set having four or more connections, e.g. a Ravigneaux set}
- F16H 2200/2005: with one sets of orbital gears
- F16H 2200/2023: using a Ravigneaux set with 4 connections
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- 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
- F16H: GEARING
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

In an electric force transmission device employing two motor generators and a differential device having at least three rotating members and having two degrees of freedom, the first rotating member is coupled to the first motor generator, the second rotating member is coupled to the second motor generator, and the third rotating member is coupled to an output shaft and laid out to be located between the first and the second rotating members on an aligmnent chart. Also, a controller is configured to control the motor generators such that, when the output shaft is driven from its stopped state, before the driving is started, the first and second motor generators are rotated oppositely to each other, while keeping a rotational speed of the output shaft at the stopped state.

## Claims

### Claim 1

An electric force transmission device capable of transmitting a motor generator's driving force into drive shafts of a vehicle, comprising:
a first motor generator;
a second motor generator;
an output shaft that outputs a driving force generated from the transmission device;
a first rotating member coupled to the first motor generator;
a second rotating member coupled to the second motor generator;
a third rotating member coupled to the output shaft;
a differential device having the first, the second, and the third rotating members and having two degrees of freedom that, when rotating states of two of the three rotating members are determined, a rotating state of the other is determined, and in which the third rotating member is laid out to be located between the first and the second rotating members on an alignment chart; and
a controller configured to control the first motor generator and second motor generator such that, when a driving achieved by only power from the first motor generator and the second motor generator is equivalent to driving started from a state of an output rotational speed of zero, before the driving is started, the first motor generator and the second motor generator are rotated oppositely to each other, while keeping the state of the output rotational speed at zero.

### Claim 2 (depends on 1)

The electric force transmission device as claimed in claim 1, further comprising:
an engine; and
a fourth rotating member coupled to the engine.

### Claim 3 (depends on 2)

The electric force transmission device as claimed in claim 2, wherein:
the controller is configured to control the motor generators such that, when the output shaft is driven from the stopped state of the rotational speed and in the presence of a large torque requirement, the motor generators are rotated oppositely to each other, while keeping the stopped state of the rotational speed of the output shaft, until a command regarding a driving force has been generated; and
after the driving force command has been generated, a summed value of a motor generator torque of the first motor generator, needed to achieve a driving force command value, and a motor generator torque of the first motor generator, needed to rotate the motor generators oppositely to each other, and a summed value of a motor generator torque of the second motor generator, needed to achieve the driving force command value, and a motor generator torque of the second motor generator, needed to rotate the motor generators oppositely to each other, are commanded to the respective motor generators.

### Claim 4 (depends on 3)

The electric force transmission device as claimed in claim 3, wherein:
the controller is configured to determine that a condition of large torque requirement is satisfied, when a selected range mode is a sporty mode at which there is a tendency for a low-speed side transmission ratio to be selected, or when a state of charge of a battery for the motor generators is a large capacity of state of charge.

### Claim 5 (depends on 3)

The electric force transmission device as claimed in claim 3, wherein:
the controller is configured to determine a presence or absence of the driving force command, depending on whether a depressing operation of an accelerator pedal, which determines the driving force, is present or absent.

### Claim 6 (depends on 3)

The electric force transmission device as claimed in claim 3, wherein:
the controller is configured to determine the driving force command value based on an accelerator pedal's depression amount, which determines the driving force.

### Claim 7 (depends on 2)

The electric force transmission device as claimed in claim 2, wherein:
the controller is configured to control the motor generators such that, when the output shaft is driven from the stopped state of the rotational speed and in the presence of a small or middle torque requirement, the motor generators are rotated oppositely to each other, so that a rotational speed of the rotating member except the third rotating member related to the output shaft is adjusted to a predetermined rotational speed, while keeping the stopped state of the rotational speed of the output shaft; and
after the rotational speed of the rotating member except the third rotating member related to the output shaft has exceeded a set rotational speed less than the predetermined rotational speed, a summed value of a motor generator torque of the first motor generator, needed to achieve a driving force command value, and a motor generator torque of the first motor generator, needed to rotate the motor generators oppositely to each other, and a summed value of a motor generator torque of the second motor generator, needed to achieve the driving force command value, and a motor generator torque of the second motor generator, needed to rotate the motor generators oppositely to each other, are commanded to the respective motor generators.

### Claim 8 (depends on 7)

The electric force transmission device as claimed in claim 7, wherein:
the controller is configured to determine that a condition of small or middle torque requirement is satisfied, when a selected range mode is an economy mode at which there is a tendency for a high-speed side transmission ratio to be selected.

### Claim 9 (depends on 7)

The electric force transmission device as claimed in claim 7, wherein:
the controller is configured to determine a presence or absence of the driving force command, depending on whether a depressing operation of an accelerator pedal, which determines the driving force, is present or absent.

### Claim 10 (depends on 7)

The electric force transmission device as claimed in claim 7, wherein:
the controller is configured to determine the driving force command value based on an accelerator pedal's depression amount, which determines the driving force.