ABS control system for off-road driving conditions
First Claim
1. A method for controlling the brakes of a wheeled vehicle, wherein said brakes are controlled by an anti-lock brake system or an electronically controlled brake system, and wherein said brake system, includes a normal driving conditions mode and an off-road driving conditions mode, said method comprising the steps of:
- (a) activating the off-road driving conditions mode;
(b) using a plurality of sensors to generate signals for use by an electronic control device to determine wheel speed, wheel retardation, and wheel acceleration, wherein said control device further comprises;
(i) a primary control logic for modulating brake pressure during time periods under normal vehicle operating conditions, and(ii) a secondary control logic for modulating brake pressure under off-road vehicle operating conditions when the off-road mode has been activated; and
(c) using said control device to calculate a vehicle reference speed and a wheel slip of each sensed and anti-lock brake system controlled wheel; and
(d) controlling at least one of the individual wheel slip and the time period for an extended wheel slip by comparing the actual speed of the vehicle to said vehicle reference speed and calculating at least one of a variable wheel slip threshold and a variable time period for an extended wheel slippage.
1 Assignment
0 Petitions
Accused Products
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.
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Citations
20 Claims
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1. A method for controlling the brakes of a wheeled vehicle, wherein said brakes are controlled by an anti-lock brake system or an electronically controlled brake system, and wherein said brake system, includes a normal driving conditions mode and an off-road driving conditions mode, said method comprising the steps of:
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(a) activating the off-road driving conditions mode; (b) using a plurality of sensors to generate signals for use by an electronic control device to determine wheel speed, wheel retardation, and wheel acceleration, wherein said control device further comprises; (i) a primary control logic for modulating brake pressure during time periods under normal vehicle operating conditions, and (ii) a secondary control logic for modulating brake pressure under off-road vehicle operating conditions when the off-road mode has been activated; and (c) using said control device to calculate a vehicle reference speed and a wheel slip of each sensed and anti-lock brake system controlled wheel; and (d) controlling at least one of the individual wheel slip and the time period for an extended wheel slip by comparing the actual speed of the vehicle to said vehicle reference speed and calculating at least one of a variable wheel slip threshold and a variable time period for an extended wheel slippage. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling the brakes of a wheeled vehicle, wherein said vehicle further comprises driven wheels and non-driven wheels and at least one driven axle and one non-driven axles, and 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, said method comprising the steps of:
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(a) activating the off-road driving conditions mode; (b) using a plurality of sensors to generate signals for use by an electronic control device to determine wheel speed, wheel retardation, and wheel acceleration, and wherein said control device further comprises; (i) a primary control logic for modulating brake pressure during time periods under normal vehicle operating conditions, and (ii) a secondary control logic for modulating brake pressure under off-road vehicle operating conditions when the off-road mode has been activated; and (c) using said control device to calculate a vehicle reference speed and a wheel slip of each sensed and anti-lock brake system controlled wheel; (d) controlling at least one of the individual wheel slip and the time period for an extended wheel slippage based on a signal indicative of said vehicle'"'"'s actual lateral acceleration; and (e) calculating said vehicle'"'"'s lateral acceleration when said vehicle is taking a curve by measuring the speed of the wheels on the inside of said curve and the speed of the wheels on the outside of said curve and determining the speed difference (Δ
V) of the non-driven wheels as measured by said sensors and calculating lateral acceleration based on said vehicle'"'"'s reference speed and the wheel track width of the vehicle'"'"'s non-driven axle. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method 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, said method comprising the steps of:
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(a) activating the off-road driving conditions mode; (b) using a plurality of sensors to generate signals within an electronic control device for wheel speed, wheel retardation, and wheel acceleration, wherein said control device further comprises; (i) a primary control logic for modulating brake pressure during time periods under normal vehicle operating conditions, and (ii) a secondary control logic for modulating brake pressure under off-road vehicle operating conditions when the off-road mode has been activated; (c) using said control device to calculate a vehicle reference speed and a wheel slip of each sensed and anti-lock brake system controlled wheel; and (d) controlling at least one of the individual wheel slip and time period for an extended wheel slippage based on the actual difference in speed of the wheels on an axle, wherein said axle is a non-driven axle. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification