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Vehicle with a super-capacitor for recovery of energy on braking

  • US 7,096,985 B2
  • Filed: 03/13/2002
  • Issued: 08/29/2006
  • Est. Priority Date: 03/14/2001
  • Status: Expired due to Term
First Claim
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1. An electric drivetrain for a vehicle, said drivetrain comprising:

  • at least one acceleration and deceleration control device usable by a driver of the vehicle;

    a processing unit for the at least one control device allowing a desired driving torque to be determined and evaluated and a desired braking torque to be determined and evaluated;

    an electrical energy source for supplying electrical energy to an electric line;

    an electrical energy storage device connected to the electric line, said electrical energy storage device including one or more super-capacitors for storing electrical energy, and said electrical energy storage device being a unit different from said electrical energy source;

    at least one electric machine connected to at least one driving wheel, and coupled to the electric line, wherein the electric machine is able to operate as a motor by absorbing electrical energy available an the electric line and transmitting a driving torque to the driving wheel, and wherein the electric machine is able to operate as a generator by transmitting a braking torque to the driving wheel and providing electrical energy to the electric line;

    a device for managing an operating mode by selecting an energy recovery mode or an energy restoration mode; and

    a unit for controlling a torque transmitted to the driving wheel and being operable in accordance with priority criteria comprising;

    in a case of a demand for a driving torque, the electric machine is operated as a motor by;

    consuming the electrical energy stored in said electrical energy storage device as long as a charge of said electrical energy storage device is not below a predetermined minimum threshold, as a priority over use of said electrical energy source, for supplying electrical energy necessary for traction of the vehicle, and,consuming the electrical energy from said electrical energy source when the charge of said electrical storage device is below the predetermined minimum threshold; and

    in a case of a demand for a braking torque, the electric machine is operated as a generator by;

    using the generated electrical energy to recharge said electrical energy storage device as long as the charge of said electrical energy storage device is not above a predetermined maximum threshold, as a priority over use of any other braking device, anddissipating the generated electrical energy, or ceasing operation of the electric machine as a generator, when the charge of said electrical energy storage device is above the predetermined threshold.

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