Method and system for controlling brake-application energy in a vehicle combination
First Claim
1. A method for controlling brake-application energy in a vehicle combination including a tractor vehicle equipped with an electronic braking system and a trailer vehicle, the tractor vehicle having at least one front axle and at least one rear axle, the trailer vehicle having at least one trailer axle, the method comprising the steps of:
- determining, during braking of said vehicle combination, a set deceleration value,measuring, during braking of said vehicle combination, an actual deceleration value,comparing said set deceleration value with said actual deceleration value,determining a brake-application energy reference value from the comparison of said set deceleration value with said actual deceleration value,determining a brake-application energy level for said tractor vehicle and a brake-application energy level for said trailer vehicle,determining an axle-load ratio for said tractor vehicle,providing sets of performance characteristics in said electronic braking system representing the dependencies of said brake-application energy level for said tractor vehicle and said brake-application energy level for said trailer vehicle on at least one of said brake-application energy reference value and said axle-load ratio,calculating a set brake-application energy value for said tractor vehicle based on (i) said set deceleration value, (ii) a value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said tractor vehicle, in accordance with said sets of performance characteristics, andcalculating a set brake-application energy value for said trailer vehicle based on (i) said set deceleration value, (ii) said value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said trailer vehicle, in accordance with said sets of performance characteristics.
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Abstract
A method and system for controlling brake-application energy in a tractor-trailer vehicle combination, the tractor vehicle having an electronic braking system (EBS), wherein, during braking, a set deceleration value is determined and compared with an actual deceleration value, and a current brake-application energy reference value (kappa) is determined from the comparison. To effect automatic load-dependent brake-force control for the trailer vehicle and to realize rapid adaptation of the control system to driving and load conditions, set brake-application energy values for each of the tractor and trailer vehicles are determined from the set deceleration value, from a value depending on kappa, and from brake-application energy levels for each of the tractor and trailer vehicles, using sets of performance characteristics resident in the EBS to describe the dependencies of the brake-application energy levels for the tractor and trailer vehicles on kappa and/or on the axle-load ratio of the tractor vehicle.
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Citations
29 Claims
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1. A method for controlling brake-application energy in a vehicle combination including a tractor vehicle equipped with an electronic braking system and a trailer vehicle, the tractor vehicle having at least one front axle and at least one rear axle, the trailer vehicle having at least one trailer axle, the method comprising the steps of:
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determining, during braking of said vehicle combination, a set deceleration value, measuring, during braking of said vehicle combination, an actual deceleration value, comparing said set deceleration value with said actual deceleration value, determining a brake-application energy reference value from the comparison of said set deceleration value with said actual deceleration value, determining a brake-application energy level for said tractor vehicle and a brake-application energy level for said trailer vehicle, determining an axle-load ratio for said tractor vehicle, providing sets of performance characteristics in said electronic braking system representing the dependencies of said brake-application energy level for said tractor vehicle and said brake-application energy level for said trailer vehicle on at least one of said brake-application energy reference value and said axle-load ratio, calculating a set brake-application energy value for said tractor vehicle based on (i) said set deceleration value, (ii) a value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said tractor vehicle, in accordance with said sets of performance characteristics, and calculating a set brake-application energy value for said trailer vehicle based on (i) said set deceleration value, (ii) said value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said trailer vehicle, in accordance with said sets of performance characteristics. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method for controlling brake-application energy in a vehicle combination including a tractor vehicle equipped with an electronic braking system and a trailer vehicle, the tractor vehicle having at least one front axle and at least one rear axle, the trailer vehicle having at least one trailer axle, the method comprising the steps of:
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determining, during braking of said vehicle combination, a set deceleration value, measuring, during braking of said vehicle combination, an actual deceleration value, comparing said set deceleration value with said actual deceleration value, determining a brake-application energy reference value from the comparison of said set deceleration value with said actual deceleration value, determining a brake-application energy level for said tractor vehicle and a brake-application energy level for said trailer vehicle, determining an axle-load for said at least one rear axle of said tractor vehicle, providing sets of performance characteristics in said electronic braking system representing the dependencies of said brake-application energy level for said tractor vehicle and said brake-application energy level for said trailer vehicle on at least one of said brake-application energy reference value and said axle-load of said tractor vehicle, calculating a set brake-application energy value for said tractor vehicle based on (i) said set deceleration value, (ii) a value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said tractor vehicle, in accordance with said sets of performance characteristics, and calculating a set brake-application energy value for said trailer vehicle based on (i) said set deceleration value, (ii) said value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said trailer vehicle, in accordance with said sets of performance characteristics. - View Dependent Claims (26, 27)
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28. A system for controlling brake-application energy in a vehicle combination including a tractor vehicle equipped with an electronic braking system and a trailer vehicle, the tractor vehicle having front and rear axles, the trailer vehicle having at least one trailer axle, the system comprising:
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means for determining, during braking of said vehicle combination, a set deceleration value, means for measuring, during braking of said vehicle combination, an actual deceleration value, means for comparing said set deceleration value with said actual deceleration value, means for determining a brake-application energy reference value from the comparison of said set deceleration value with said actual deceleration value, means for determining a brake-application energy level for said tractor vehicle and a brake-application energy level for said trailer vehicle, means for determining an axle-load ratio for said tractor vehicle, means for generating sets of performance characteristics in said electronic braking system representing the dependencies of said brake-application energy level for said tractor vehicle and said brake-application energy level for said trailer vehicle on at least one of said brake-application energy reference value and said axle-load ratio, means for calculating a set brake-application energy value for said tractor vehicle based on (i) said set deceleration value, (ii) a value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said tractor vehicle, in accordance with said sets of performance characteristics, means for calculating a set brake-application energy value for said trailer vehicle based on (i) said set deceleration value, (ii) said value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said trailer vehicle, in accordance with said sets of performance characteristics, and means for distributing brake-application energy to said tractor vehicle and said trailer vehicle based on said set brake-application energy value for said tractor vehicle and said set brake-application energy value for said trailer vehicle.
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29. A system for controlling brake-application energy in a vehicle combination including a tractor vehicle equipped with an electronic braking system and a trailer vehicle, the tractor vehicle having front and rear axles, the trailer vehicle having at least one trailer axle, the system comprising:
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means for determining, during braking of said vehicle combination, a set deceleration value, means for measuring, during braking of said vehicle combination, an actual deceleration value, means for comparing said set deceleration value with said actual deceleration value, means for determining a brake-application energy reference value from the comparison of said set deceleration value with said actual deceleration value, means for determining a brake-application energy level for said tractor vehicle and a brake-application energy level for said trailer vehicle, means for determining an axle-load for said rear axle of said tractor vehicle, means for generating sets of performance characteristics in said electronic braking system representing the dependencies of said brake-application energy level for said tractor vehicle and said brake-application energy level for said trailer vehicle on at least one of said brake-application energy reference value and said axle-load of said tractor vehicle, means for calculating a set brake-application energy value for said tractor vehicle based on (i) said set deceleration value, (ii) a value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said tractor vehicle, in accordance with said sets of performance characteristics, means for calculating a set brake-application energy value for said trailer vehicle based on (i) said set deceleration value, (ii) said value that is a function of said brake-application energy reference value, and (iii) said brake-application energy level for said trailer vehicle, in accordance with said sets of performance characteristics, and means for distributing brake-application energy to said tractor vehicle and said trailer vehicle based on said set brake-application energy value for said tractor vehicle and said set brake-application energy value for said trailer vehicle.
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Specification