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EP-4063217-B1 - VEHICLE DRIVE DEVICE AND CONTROL METHOD FOR THE SAME

EP4063217B1EP 4063217 B1EP4063217 B1EP 4063217B1EP-4063217-B1

Inventors

  • TABATA, ATSUSHI
  • OKUDA, KOICHI
  • TAKAIRA, KOJI
  • MAKINO, YUKI
  • HOMAN, AKINORI
  • AKIYAMA, Yosuke
  • IJICHI, AKIRA
  • USUI, KUNIHIKO

Dates

Publication Date
20260506
Application Date
20220222

Claims (6)

  1. A vehicle drive device (10), comprising: a power source (2, MG1, MG2) including a first rotating electrical machine (MG2); a second rotating electrical machine (MGF); a first output shaft (63; 62) connected to the power source (2, MG1, MG2) and configured to output power to one of a front wheel (3R, 3L) and a rear wheel (4R, 4L); a second output shaft (62; 63) configured to output power to another of the front wheel (3R, 3L) and the rear wheel (4R, 4L); a differential unit (64) that is a single-pinion planetary gear unit, including a ring gear (R3) connected to the first output shaft (63; 62), a carrier (CA3) connected to the second output shaft (62; 63), and a sun gear (S3) connected to the second rotating electrical machine (MGF); and an electronic control device (100) configured to regeneratively control the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) in such a manner that negative torque is applied to the first output shaft (63; 62) and the second output shaft (62, 63), when performing regenerative control of the second rotating electrical machine (MGF) in a drive mode in which torque from the power source (2, MG1, MG2) is distributed to the first output shaft (63; 62) and the second output shaft (62; 63) using the differential unit (64) and by controlling torque of the second rotating electrical machine (MGF) during deceleration of a vehicle (1) equipped with the vehicle drive device (10).
  2. The vehicle drive device (10) according to claim 1, wherein the electronic control device (100) is configured to regeneratively control the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) in such a manner that a braking force distribution ratio between the front wheel (3R, 3L) and the rear wheel (4R, 4L) becomes a target braking force distribution ratio during deceleration of the vehicle (1).
  3. The vehicle drive device (10) according to claim 2, wherein the electronic control device (100) is configured to, when the braking force distribution ratio is not controllable to the target braking force distribution ratio by the regenerative control of the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) during deceleration of the vehicle (1), control the braking force distribution ratio to the target braking force distribution ratio by covering by a wheel brake a shortage of a braking force obtained by the regenerative control of the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) with respect to braking forces required for the front wheel (3R, 3L) and the rear wheel (4R, 4L).
  4. The vehicle drive device (10) according to claim 2 or 3, wherein the electronic control device (100) is configured to set the target braking force distribution ratio according to target deceleration.
  5. The vehicle drive device (10) according to any one of claims 1 to 4, wherein the electronic control device (100) is configured to cover a shortage of deceleration by a wheel brake when target deceleration is not achievable by the regenerative control of the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) due to limitation on an amount of regeneration of the first rotating electrical machine (MG2).
  6. A control method for a vehicle drive device (10), the vehicle drive device (10) including a power source (2, MG1, MG2) including a first rotating electrical machine (MG2), a second rotating electrical machine (MGF), a first output shaft (63; 62) connected to the power source (2, MG1, MG2) and configured to output power to one of a front wheel (3R, 3L) and a rear wheel (4R, 4L), a second output shaft (62; 63) configured to output power to another of the front wheel (3R, 3L) and the rear wheel (4R, 4L), and a differential unit (64) that is a single-pinion planetary gear unit, including a ring gear (R3) connected to the first output shaft (63; 62), a carrier (CA3) connected to the second output shaft (62; 63), and sun gear (S3) connected to the second rotating electrical machine (MGF), the control method comprising regeneratively controlling the first rotating electrical machine (MG2) and the second rotating electrical machine (MGF) in such a manner that negative torque is applied to the first output shaft (63; 62) and the second output shaft (62, 63), when performing regenerative control by the second rotating electrical machine (MGF) in a drive mode in which torque from the power source (2, MG1, MG2) is distributed to the first output shaft (63; 62) and the second output shaft (62; 63) using the differential unit (64) and by controlling torque of the second rotating electrical machine (MGF) during deceleration of a vehicle (1) equipped with the vehicle drive device (10).

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to vehicle drive devices and control methods thereof. 2. Description of Related Art Japanese Unexamined Patent Application Publication No. 2007-246056 (JP 2007-246056 A) discloses a vehicle drive device including a power source, a second rotating electrical machine, a first output shaft, a second output shaft, and a differential mechanism. The power source includes a first rotating electrical machine. The first output shaft is connected to the power source and outputs power to either front wheels or rear wheels. The second output shaft outputs power to the other of the front wheels and the rear wheels. The differential mechanism includes a first rotating element connected to the first output shaft, a second rotating element connected to the second output shaft, and a third rotating element connected to the second rotating electrical machine. The vehicle drive device distributes torque from the power source to the first output shaft and the second output shaft by controlling the torque from the rotating electrical machine. DE 20 2015 104054 U1 provides an electric vehicle and a drive system for an electric vehicle. US 2011/0276241 A1 provides control apparatus for a power transmitting system of a four-wheel-drive vehicle. DE 20 2015 104054 U1 and US 2011/0276241 A1 do not provide a vehicle drive device comprising a first output shaft connected to a power source. SUMMARY OF THE INVENTION In the vehicle drive device disclosed in JP 2007-246056 A, when performing regenerative control of the second rotating electrical machine in a drive mode in which the torque from the power source is distributed to the first output shaft and the second output shaft by controlling the torque from the second rotating electrical machine during deceleration of the vehicle, positive torque is applied to the first rotating element by the regenerative control of the second rotating electrical machine, and positive torque is therefore applied to the first output shaft. The present invention was made in view of the above problems, and provides a vehicle drive device and a control method for the vehicle drive device in which a first rotating electrical machine and a second rotating electrical machine can be regeneratively controlled so that negative torque is applied to a first output shaft and a second output shaft while performing regenerative control of the second rotating electrical machine during deceleration of a vehicle. A first aspect of the present invention relates to a vehicle drive device according to independent claim 1. According to the vehicle drive device of the first aspect, negative torque can be applied to the first output shaft and the second output shaft while performing the regenerative control of the second rotating electrical machine during deceleration of the vehicle. In the vehicle drive device of the first aspect, the electronic control device may be configured to regeneratively control the first rotating electrical machine and the second rotating electrical machine in such a manner that a braking force distribution ratio between the front wheel and the rear wheel becomes a target braking force distribution ratio during deceleration of the vehicle. According to the vehicle drive device having the above configuration, appropriate braking forces can be applied to the front wheel and the rear wheel. In the vehicle drive device of the first aspect, the electronic control device may be configured to, when the braking force distribution ratio is not controllable to the target braking force distribution ratio by the regenerative control of the first rotating electrical machine and the second rotating electrical machine during deceleration of the vehicle, control the braking force distribution ratio to the target braking force distribution ratio by covering by a wheel brake a shortage of a braking force obtained by the regenerative control of the first rotating electrical machine and the second rotating electrical machine with respect to braking forces required for the front wheel and the rear wheel. According to the vehicle drive device having the above configuration, appropriate braking forces can be applied to the front wheel and the rear wheel even when the braking force distribution ratio is not controllable to the target braking force distribution ratio by the regenerative control of the first rotating electrical machine and the second rotating electrical machine. In the vehicle drive device having the above configuration, the electronic control device may be configured to set the target braking force distribution ratio according to target deceleration. According to the vehicle drive device having the above configuration, the target braking force distribution ratio suitable for the target deceleration can be set. In the vehicle drive device of the first aspect, the electronic control device may be configured to cover a shortage o