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Vehicle drive system

  • US 10,442,282 B2
  • Filed: 08/02/2017
  • Issued: 10/15/2019
  • Est. Priority Date: 12/22/2011
  • Status: Active Grant
First Claim
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1. A vehicle drive system, including:

  • a left-wheel drive unit having a first motor for driving a left wheel of a vehicle and a first transmission that is provided on a power transmission line between the first motor and the left wheel;

    a right-wheel drive unit having a second motor for driving a right wheel of the vehicle and a second transmission that is provided on a power transmission line between the second motor and the right wheel; and

    a motor control unit for controlling the first motor and the second motor,wherein the first and second transmissions each has a first to third rotational elements,wherein the first motor is connected to the first rotational element of the first transmission, wherein the second motor is connected to the first rotational element of the second transmission,wherein the left wheel is connected to the second rotational element of the first transmission,wherein the right wheel is connected to the second rotational element of the second transmission,wherein the third rotational element of the first transmission and the third rotational element of the second transmission are coupled to each other,wherein the first and second transmissions each further has a fourth rotational element which are supported so as to revolve around by the second rotational element while meshing with the first rotational element and the third rotational element, wherein the motor control unit is configured to;

    perform at least one of first control and second control, the first control including controlling the first motor based on a first target revolution state quantity of the first transmission which is induced so that a rotating direction of the fourth rotational element of the first transmission rotating in one direction or another direction is not reversed, the second control including controlling the second motor based on a second target revolution state quantity of the second transmission which is induced so that a rotating direction of the fourth rotational element of the second transmission rotating in one direction or a other direction is not reversed, andthereby control the first motor and the second motor so as not to reverse at least one of the rotating direction of the fourth rotational element of the first transmission and the rotating direction of the fourth rotational element of the second transmissions wherein there is further provided a connection/disconnection unit that can be released or applied and which slows a rotation of the third rotational elements by being applied, and wherein the motor control unit controls the first motor and the second motor further based on a target revolution state quantity of the coupled third rotational elements.

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