US 2007/0164606 A1 · ABS control system for off-road driving conditions

Abstract

A system for controlling at least one of the slip threshold and the time period for an extended wheel slippage for a vehicle that is operating in the off-road ABS mode. When driving in a curve pattern and/or at high speeds, the individual wheel speeds are controlled with a lower slip threshold and/or shorter time period for the extended wheel slippage than when driving straight ahead and/or at a lower vehicle speed. Control of the brakes is accomplished by (i) controlling at least one of the individual wheel slip threshold and the time period for an extended wheel slippage based on the actual vehicle speed; (ii) controlling at least one of the individual wheel slip threshold and the time period for an extended wheel slippage depending on actual lateral acceleration; (iii) using a lateral acceleration sensor to measure actual lateral acceleration; (iv) measuring the actual steering angle with a sensor and controlling the wheel speed cycles in conjunction with the actual vehicle speed; (v) using a yaw rate sensor to determine at least one of the deepness and the time period of the wheel slippage; (vi) controlling the speed of the wheels on either side of the vehicle with different slip thresholds and/or different time periods for the slippage extension; (vii) controlling at least one of the individual wheel slip threshold and the time period for an extended wheel slippage depending on the wheel speed difference of a non-driven axle; and/or (viii) deactivating the off-road mode automatically when the vehicle reaches a predetermined speed.

Claims10

Dependent claims

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 and calculates at least one of a variable wheel slip threshold and a variable time period for an extended wheel slippage for controlling at least one of the individual wheel slip and the time period for an extended wheel slip.

3 more elements

Dependencies are inferred from the claim text.

ABS control system for off-road driving conditions

Life of this patent

ABS control system for off-road driving conditions

Life of this patent

Abstract

Claims10