Patent ID: 7841674

Claim:
An electronic control device for controlling the brakes of a wheeled vehicle, wherein said brakes are controlled by an anti-lock brake system and wherein said anti-lock brake system, includes a normal driving conditions mode and an off-road driving conditions mode, and wherein said brake system is operating in the off-road driving conditions mode, comprising: (a) one or more inputs for receiving signals from a plurality of sensors for use by said electronic control device to determine wheel speed, wheel retardation, and wheel acceleration; (b) a primary control logic for modulating brake pressure during time periods under normal vehicle operating conditions; (c) a secondary control logic for modulating brake pressure under off-road vehicle operating conditions when the off-road mode has been activated; and (d) a processing unit that calculates a vehicle reference speed and a wheel slip of each sensed and anti-lock brake system controlled wheel, wherein said processing unit compares the actual speed of the vehicle to said vehicle reference speed, calculates at least one of a variable wheel slip threshold and a variable time period for an extended wheel slippage and controls at least one of the individual wheel slip and the time period for an extended wheel slip.