# US 2016/0257221 A1 · Driving power distribution device

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- Number: US 2016/0257221 A1
- Document ID: US20160257221A1
- Status: Published application
- Kind: A1
- Application number: 15/014,919
- Filed: 2016-02-03
- Published: 2016-09-08
- Earliest claimed: 2015-03-06
- Assignees: Kabushiki Kaisha Toyota Chuo Kenkyusho
- Applicants: Kabushiki Kaisha Toyota Chuo Kenkyusho
- Inventors: Kosuke AIKI; Hideo NAKAI; Yoshihiro MIZUNO; Eiji TSUCHIYA
- Web page: https://patentgrep.com/patent/US20160257221A1

## CPC

- B60L 15/2036: {Electric differentials, e.g. for supporting steering vehicles}
- H02P 5/46: for speed regulation of two or more dynamo-electric motors in relation to one another
- H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence)
- B60L 2220/46: Wheel motors, i.e. motor connected to only one wheel
- B60L 2240/421: Speed
- B60L 2240/423: Torque
- B60L 2240/429: Current
- B60L 2240/526: Operating parameters
- B60L 2240/529: Current
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/72: Electric energy management in electromobility
- 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
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

When a rotational difference is generated between a left driving wheel and a right driving wheel, by controlling the frequency f0 of alternating currents to be fed to stator windings of first and second induction machines by a shared inverter, torque distribution to the left driving wheel and the right driving wheel is controlled.

## Claims

### Claim 1

A driving power distribution device that adjusts torque distribution to a first drive shaft and a second drive shaft, the device comprising:
a first induction machine that transmits a torque to the first drive shaft;
a second induction machine that transmits a torque to the second drive shaft; and
a shared power conversion system that applies common alternating currents to the first induction machine and the second induction machine, wherein
the frequency of the common alternating currents is set based on the rotational speed and a target torque value of the first induction machine and the rotational speed and a target torque value of the second induction machine.

### Claim 2 (depends on 1)

The driving power distribution device according to claim 1, wherein the amplitude of the common alternating currents is set based on the rotational speed and the target torque value of the first induction machine and the rotational speed and the target torque value of the second induction machine.

### Claim 3 (depends on 1)

The driving power distribution device according to claim 1, wherein:
a difference in the number of poles between the first induction machine and the second induction machine is changeable; and
the frequency of the common alternating currents and the difference in the number of poles are set based on the rotational speed and the target torque value of the first induction machine and the rotational speed and the target torque value of the second induction machine.

### Claim 4 (depends on 2)

The driving power distribution device according to claim 2, wherein:
a difference in the number of poles between the first induction machine and the second induction machine is changeable; and
the frequency of the common alternating currents and the difference in the number of poles are set based on the rotational speed and the target torque value of the first induction machine and the rotational speed and the target torque value of the second induction machine.

### Claim 5 (depends on 1)

The driving power distribution device according to claim 1, wherein when a rotational difference is generated between the first induction machine and the second induction machine, in order to adjust the frequency of the common alternating currents so as to apply a driving torque to, of the first and second induction machines, the induction machine having a higher rotational speed and apply a braking torque to the induction machine having a lower rotational speed, a difference in the number of poles is set such that the number of poles of the induction machine having the higher rotational speed becomes smaller than the number of poles of the induction machine having the lower rotational speed.

### Claim 6 (depends on 2)

The driving power distribution device according to claim 2, wherein when a rotational difference is generated between the first induction machine and the second induction machine, in order to adjust the frequency of the common alternating currents so as to apply a driving torque to, of the first and second induction machines, the induction machine having a higher rotational speed and apply a braking torque to the induction machine having a lower rotational speed, a difference in the number of poles is set such that the number of poles of the induction machine having the higher rotational speed becomes smaller than the number of poles of the induction machine having the lower rotational speed.

### Claim 7 (depends on 3)

The driving power distribution device according to claim 3, wherein when a rotational difference is generated between the first induction machine and the second induction machine, in order to adjust the frequency of the common alternating currents so as to apply a braking torque to, of the first and second induction machines, the induction machine having a higher rotational speed and apply a driving torque to the induction machine having a lower rotational speed, the difference in the number of poles is set such that the number of poles of the induction machine having the higher rotational speed becomes equal to or greater than the number of poles of the induction machine having the lower rotational speed.

### Claim 8 (depends on 4)

The driving power distribution device according to claim 4, wherein when a rotational difference is generated between the first induction machine and the second induction machine, in order to adjust the frequency of the common alternating currents so as to apply a braking torque to, of the first and second induction machines, the induction machine having a higher rotational speed and apply a driving torque to the induction machine having a lower rotational speed, the difference in the number of poles is set such that the number of poles of the induction machine having the higher rotational speed becomes equal to or greater than the number of poles of the induction machine having the lower rotational speed.

### Claim 9 (depends on 1)

The driving power distribution device according to claim 1, wherein:
a difference between a transmission gear ratio on the first drive shaft side and a transmission gear ratio on the second drive shaft side is changeable, the transmission gear ratio on the first drive shaft side being a transmission gear ratio from the first induction machine to the first drive shaft, the transmission gear ratio on the second drive shaft side being a transmission gear ratio from the second induction machine to the second drive shaft; and
the difference in the transmission gear ratio between the first drive shaft and the second drive shaft is set based on the rotational speed and the target torque value of the first induction machine and the rotational speed and the target torque value of the second induction machine.

### Claim 10 (depends on 9)

The driving power distribution device according to claim 9, wherein when a rotational difference is generated between the first drive shaft and the second drive shaft, in order to adjust the frequency of the common alternating currents so as to apply a driving torque to, of the first and second drive shafts, the drive shaft having a higher rotational speed and apply a braking torque to the drive shaft having a lower rotational speed, the difference in the transmission gear ratio is set such that the transmission gear ratio on the side of the drive shaft having the higher rotational speed becomes smaller than the transmission gear ratio on the side of the drive shaft having the lower rotational speed.

### Claim 11 (depends on 9)

The driving power distribution device according to claim 9, wherein when a rotational difference is generated between the first drive shaft and the second drive shaft, in order to adjust the frequency of the common alternating currents so as to apply a braking torque to, of the first and second drive shafts, the drive shaft having a higher rotational speed and apply a driving torque to the drive shaft having a lower rotational speed, the difference in the transmission gear ratio is set such that the transmission gear ratio on the side of the drive shaft having the higher rotational speed becomes equal to or greater than the transmission gear ratio on the side of the drive shaft having the lower rotational speed.

### Claim 12 (depends on 1)

The driving power distribution device according to claim 1, wherein:
the first drive shaft rotates with one of a left driving wheel and a right driving wheel of a vehicle; and
the second drive shaft rotates with the other one of the left driving wheel and the right driving wheel of the vehicle.