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Control method for a coordinated regenerative brake system

  • US 20010024062A1
  • Filed: 02/13/2001
  • Published: 09/27/2001
  • Est. Priority Date: 03/24/2000
  • Status: Active Grant
First Claim
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1. A control method for a coordinated regenerative brake system in which a total brake torque to be applied to a vehicle is produced by coordinating friction brake torque and regenerative brake torque, wherein:

  • in the vehicle speed range less than or equal to a specific value (V1), when accelerator operator operation amount (Sa) is effectively zero, a brake torque (Ta) equivalent to engine brake torque working on the vehicle is set to be controlled to approach gradually zero in accordance with vehicle speed (V); and

    when brake operator operation starts in a vehicle speed range exceeding the specific value (V1), brake torque is controlled using as a desired total brake torque (Tq) for the vehicle in the vehicle speed range exceeding the specific value (V1), a sum of brake torque (Tb) corresponding to operational state of a brake operator, and brake torque (Ta) corresponding to operational state of accelerator operator, and;

    in the vehicle speed range less than or equal to the specific value (V1), using as the desired total brake torque (Tq) the sum of brake torque (Tb) corresponding to operational state of a brake operator, and first engine brake equivalent torque (Ta1), which is comparable to engine brake torque when vehicle speed (V) reaches the specific value (V1), when brake operator operation amount (Sb) is equal to or greater than a first brake operator operation amount (Sb1), which is brake operator operation when the vehicle speed (V) reaches the specific value (Vi), and;

    using as the desired total brake torque (Tq), when brake operator operation amount (Sb) is less than the first brake operator operation amount (Sb1), the sum of brake torque (Tb) corresponding to operational state of a brake operator, and torque (Ta′

    ) calculated to approach brake torque (Ta), which corresponds to operational state of an accelerator operator, from first engine brake equivalent torque (Ta1) in accordance with the reduction ratio of brake operator operation amount (Sb).

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