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Vehicle braking-force control device

  • US 8,958,967 B2
  • Filed: 02/25/2008
  • Issued: 02/17/2015
  • Est. Priority Date: 02/26/2007
  • Status: Active Grant
First Claim
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1. A vehicle braking-force control device comprising:

  • a road-surface friction coefficient estimator configured to estimate a road-surface friction coefficient;

    a ground-load estimator configured to estimate ground loads acting on individual wheels;

    a lateral-tire-force estimator configured to estimate lateral tire forces acting on the individual wheels;

    a vehicle-behavior detector configured to detect whether a vehicle is running in an understeer condition or an oversteer condition;

    a permissible-engine-torque calculator configured to calculate a permissible engine torque on the basis of the road-surface friction coefficient, the ground loads of the individual wheels, and the lateral tire forces of the individual wheels when an understeer condition is detected;

    a brake controller configured to perform brake control on an inside turning wheel when the understeer condition is detected; and

    an engine-torque controller configured to control an engine torque such that;

    in an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is not detected, the engine-torque controller reduces the engine torque in accord with a parameter that is based on the permissible engine torque, andin an understeer condition detected when the brake controller performs a brake control, and when an operation of engine braking is detected, the engine-torque controller increases the engine torque to substantially zero.

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