Braking system for an off-highway machine involving electric retarding integrated with service brakes
First Claim
1. A method of braking a machine having an electric drive configuration including at least one electric retarding system associated with a first set of wheels, a first friction brake system associated with the first set of wheels to provide a first brake system output torque, a second friction brake system associated with a second set of wheels to provide a second brake system output torque, the method comprising:
- calculating a desired machine retarding torque to be applied to the machine;
determining a desired ratio of machine retarding torque splits between the first set of wheels and the second set of wheels;
commanding the electric retarding system to supply a calculated output torque based on the desired machine retarding torque and the desired ratio of retarding torque splits;
applying a ratio of the first brake system output torque to the second brake system output torque to supplement the output torque supplied by the electric retarding system if the electric retarding system is not providing the desired machine retarding torque.
1 Assignment
0 Petitions
Accused Products
Abstract
The disclosure describes, in one aspect, a method of braking a machine having an electric drive configuration. The electric drive configuration includes at least one electric retarding system connected to a first set of wheels. Additionally, a first friction brake system connects to the first set of wheels to provide a braking output torque. A second friction brake system connects to a second set of wheels and provides a second braking output torque. The system calculates and applies a braking ratio between the electric and friction braking systems based upon both user controls and conditions encountered.
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Citations
20 Claims
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1. A method of braking a machine having an electric drive configuration including at least one electric retarding system associated with a first set of wheels, a first friction brake system associated with the first set of wheels to provide a first brake system output torque, a second friction brake system associated with a second set of wheels to provide a second brake system output torque, the method comprising:
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calculating a desired machine retarding torque to be applied to the machine; determining a desired ratio of machine retarding torque splits between the first set of wheels and the second set of wheels; commanding the electric retarding system to supply a calculated output torque based on the desired machine retarding torque and the desired ratio of retarding torque splits; applying a ratio of the first brake system output torque to the second brake system output torque to supplement the output torque supplied by the electric retarding system if the electric retarding system is not providing the desired machine retarding torque. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An off-road work machine comprising:
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an engine connected to a generator powering an electric motor; at least one electric retarding system associated with a rear set of wheels; a front friction brake system associated with a front set of wheels and disposed to provide a front brake system output torque; a rear friction brake system associated with the rear set of wheels and disposed to provide a rear brake system output torque; the electric motor associated with a set of rear wheels and configured to provide electric retarding to the off-road work machine; at least one control module configured to calculate a desired machine retarding torque to be applied to the off-road work machine, to determine a desired ratio of machine retarding torque splits between the front set of wheels and the rear set of wheels, to command the at least one electric retarding system to supply a calculated output torque based on the desired machine retarding torque and the desired ratio of retarding torque splits, and to apply a ratio of the front brake system output torque to the rear brake system output torque to supplement the output torque supplied by the at least one electric retarding system if the at least one electric retarding system is not providing the desired machine retarding torque. - View Dependent Claims (13, 14, 15)
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16. A method of braking a machine having an electric drive configuration including at least one electric retarding system associated with a first set of wheels, a first friction brake system associated with the first set of wheels to provide a first brake system output torque, a second friction brake system associated with a second set of wheels to provide a second brake system output torque, the method comprising:
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calculating a desired machine retarding torque to be applied to the machine; commanding the electric retarding system to supply the desired machine retarding torque; and applying a ratio of the first brake system output torque to the second brake system output torque to supplement the output torque supplied by the electric retarding system if the electric retarding system is not providing the desired machine retarding torque. - View Dependent Claims (17, 18, 19, 20)
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Specification