System for controlling brake pressure based on fuzzy logic using steering angle and yaw speed
First Claim
1. Vehicle dynamics control system for a vehicle having wheels, said system comprisingmeans for determining desired slip values λ
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is for said wheels,means for determining actual slip values λ
i at said wheels,an antilock controller which determines first desired pressure values Pis by comparing said actual slip values λ
i to said desired slip values λ
is,means for determining the front axle steering angle δ
,means for determining the yaw speed w,a fuzzy logic brake controller which determines correction values Δ
Pis in dependence on the front steering angle δ and
the yaw speed w,adding means for determining second desired pressure values P*is according to P*is =Pis +Δ
Pis,a pressure controller for generating brake pressure control signals in dependence on said second desired pressure values P*is, andbrake control valves responsive to said brake pressure control signals.
1 Assignment
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Accused Products
Abstract
An ABS which evaluates slip values prescribes pressure values for the wheel brakes. In order to improve the driving stability, these pressure values are varied by a brake controller using the deviation of the yawing speed from a set value and the front-axle steering angle as input variables. The brake controller determines its output values (variation values) with the aid of the fuzzy logic. Additionally, rear-axle steering is integrated into the system, the system partially also using fuzzy logic. Subsequently, an adaptation which is based on fuzzy logic and uses the brake controller and the rear-axle steering controller in a weighted fashion is proposed.
94 Citations
14 Claims
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1. Vehicle dynamics control system for a vehicle having wheels, said system comprising
means for determining desired slip values λ -
is for said wheels,
means for determining actual slip values λ
i at said wheels,an antilock controller which determines first desired pressure values Pis by comparing said actual slip values λ
i to said desired slip values λ
is,means for determining the front axle steering angle δ
,means for determining the yaw speed w, a fuzzy logic brake controller which determines correction values Δ
Pis in dependence on the front steering angle δ and
the yaw speed w,adding means for determining second desired pressure values P*is according to P*is =Pis +Δ
Pis,a pressure controller for generating brake pressure control signals in dependence on said second desired pressure values P*is, and brake control valves responsive to said brake pressure control signals. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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is for said wheels,
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8. Vehicle dynamics control system for a vehicle having wheels, said system comprising
means for determining first desired slip values λ -
is for said wheels,
means for determining actual slip values λ
i at said wheels,means for determining the front axle steering angle δ
,means for determining the yaw speed w, a fuzzy logic brake controller which determines correction values Δ
λ
is in dependence on the front steering angle δ and
the yaw speed w,adding means for determining second desired slip values λ
*is according to λ
*is =λ
is +Δ
λ
is,an anti-lock controller which determines desired pressure values Pis by comparing said actual slip values λ
i with said second desired slip values λ
*is,a pressure controller for generating brake pressure control signals in dependence on said desired pressure values Pis, and brake control valves responsive to said brake pressure control signals. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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is for said wheels,
Specification