Method and device for assessing the compatability of braking systems of a vehicle combination
AssigneeWABCO GmbH
InventorsBernd Heise, Hans Holst, Udo Ronnenberg, Axel Stender, Norbert Witte
Life of this patent
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Abstract
A method and a device for assessing the compatibility of braking systems of a vehicle combination comprising a tractor and a trailer determine applied braking power (Wa) for a braking process of the trailer, and a required braking power for the braking process (Wb) of the trailer.
Claims16
A method for assessing the compatibility of braking systems of a vehicle combination having a towing vehicle and a trailer vehicle, said vehicle combination including a suitably programmed control device having a memory, the method comprising the steps of (i) determining, utilizing said control device, an applied amount of braking energy from a start of a braking process of said trailer vehicle to an end of said braking process, (ii) determining, utilizing said control device, a required amount of braking energy from said start of said braking process to said end of said braking process, (iii) determining, utilizing said control device, a variable that is both a function of and a quotient formed from each of said applied amount of braking energy and said required amount of braking energy, and (iv) adjusting said braking systems of said vehicle combination based on said variable, wherein said determining of said applied amount of braking energy comprises detecting an applied braking pressure in a brake cylinder of said trailer vehicle.
A method for assessing the compatibility of braking systems of a vehicle combination having a towing vehicle and a trailer vehicle, said vehicle combination including a suitably programmed control device having a memory, the method comprising the steps of (i) determining, utilizing said control device, an applied amount of braking energy of a braking process of said trailer vehicle, (ii) determining, utilizing said control device, a required amount of braking energy of said braking process of said trailer vehicle, (iii) determining, utilizing said control device, a variable that is both a function of and a quotient formed from each of said applied amount of braking energy and said required amount of braking energy, and (iv) adjusting said braking systems of said vehicle combination based on said variable, wherein said step of determining said required amount of braking energy includes calculating said required amount of braking energy according to the relationship:
- W
- b
- =
- m
- A
- ·
- (
- v
- An
- -
- v
- A
-
-
- 1
- )
- 2
- 2
- Where:
- Wb is the required amount of braking energy;
- mA is the mass of the trailer vehicle;
- vAl is the speed of the trailer vehicle at the start of the braking process;
- and
- vAn is the speed of the trailer vehicle after the end of the braking process.
A control device suitably programmed to effect a method for assessing the compatibility of braking systems of a vehicle combination having a towing vehicle and a trailer vehicle, the method comprising the steps of (i) determining, utilizing said control device, an applied amount of braking energy from a start of a braking process of said trailer vehicle to an end of said braking process, (ii) determining, utilizing said control device, a required amount of braking energy from said start of said braking process to said end of said braking process, (iii) determining, utilizing said control device, a variable that is both a function of and a quotient formed from each of said applied amount of braking energy and said required amount of braking energy, and (iv) adjusting said braking systems of said vehicle combination based on said variable, wherein said determining of said applied amount of braking energy comprises detecting an applied braking pressure in a brake cylinder of said trailer vehicle.
A method for assessing the compatibility of braking systems of a vehicle combination having a towing vehicle and a trailer, said vehicle combination including a suitably programmed control device having a memory, the method comprising the steps of:
- when said vehicle combination is being braked, determining braked trailer speed at the start of braking, and storing said braked trailer speed in said control device;
- determining brake pressures in trailer brake cylinders and wheel speeds of trailer wheels braked by said trailer brake cylinders, and storing said brake pressures and wheel speeds in said control device;
- when said vehicle combination is no longer being braked, determining unbraked trailer speed, and storing said unbraked trailer speed in said control device;
- utilizing said control device, calculating an applied amount of braking energy Waj according to the relationship:
- W
- aj
- =
- k
- ·
- T
- ·
- ∑
- i
- =
- 1
- n
-
- (
- p
- Bji
- -
- P
- AN
- )
- ·
- v
- Rji
- Where:
- k is a constant,
- T is a sampling time of the control device,
- pBji is the pressure in the brake cylinder,
- pAN is an application pressure, and
- vRji is the circumferential speed of the braked trailer wheel;
- utilizing said control device, calculating a required amount of braking energy Wb according to the relationship:
- W
- b
- =
- m
- A
- ·
- (
- v
- An
- -
- v
- A
-
-
- 1
- )
- 2
- 2
- Where:
- mA is the mass of the trailer vehicle,
- vAl is the speed of the trailer at the start of the braking process, and
- vAn is the speed of the trailer after the end of the braking process;
- utilizing said control device, determining a variable as both a function of and a quotient formed from said applied amount of braking energy and said required amount of braking energy;
- and
- adjusting said braking systems of said vehicle combination based on said variable.
A control device suitably programmed to effect a method for assessing the compatibility of braking systems of a vehicle combination having a towing vehicle and a trailer, the method comprising the steps of:
- when said vehicle combination is being braked, determining braked trailer speed at the start of braking, and storing said braked trailer speed in said control device;
- determining brake pressures in trailer brake cylinders and wheel speeds of trailer wheels braked by said trailer brake cylinders, and storing said brake pressures and wheel speeds in said control device;
- when said vehicle combination is no longer being braked, determining unbraked trailer speed, and storing said unbraked trailer speed in said control device;
- utilizing said control device, calculating an applied amount of braking energy Waj according to the relationship:
- W
- aj
- =
- k
- ·
- T
- ·
- ∑
- i
- =
- 1
- n
-
- (
- p
- Bji
- -
- P
- AN
- )
- ·
- v
- Rji
- Where:
- k is a constant,
- T is a sampling time of the control device,
- pBji is the pressure in the brake cylinder,
- pAN is an application pressure, and
- vRji is the circumferential speed of the braked trailer wheel;
- utilizing said control device, calculating a required amount of braking energy Wb according to the relationship:
- W
- b
- =
- m
- A
- ·
- (
- v
- An
- -
- v
- A
-
-
- 1
- )
- 2
- 2
- Where:
- mA is the mass of the trailer vehicle,
- vAl is the speed of the trailer at the start of the braking process, and
- vAn is the speed of the trailer after the end of the braking process;
- utilizing said control device, determining a variable as both a function of and a quotient formed from said applied amount of braking energy and said required amount of braking energy;
- and
- adjusting said braking systems of said vehicle combination based on said variable.
Dependencies are inferred from the claim text.