Brake system for autonomous operation
One or more techniques and/or systems are disclosed for providing autonomous or semi-autonomous braking with a brake system. The brake system includes at least one brake, a main pump, a backup energy source, a primary valve set having a primary control valve and enable valve, and a secondary valve set having a secondary control valve and an enable valve, wherein the at least one brake, the main pump, the backup energy source, the primary valve set, and the secondary valve set are in fluid communication. The brake system further includes a control unit configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one of a normal braking condition and a failure braking condition.
1 . A brake system, comprising:
at least one brake;
a main pump;
a backup energy source;
a primary valve set having a primary control valve in series with a primary enable valve;
a secondary valve set having a secondary control valve in series with a secondary enable valve;
a first shuttle valve in fluid communication with the primary valve set, the secondary valve set, and the at least one brake, wherein the first shuttle valve is positioned between the at least one brake and the primary valve set and the secondary valve set,
wherein the at least one brake, the main pump, the backup energy source, the primary valve set, and the secondary valve set are in fluid communication; and
a control unit configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one of a normal braking condition or a failure braking condition.
2 . The brake system of claim 1 , further comprising one or more sensors communicatively coupled with one or more of the main pump, the backup energy source, the primary valve set, and the secondary valve set, wherein the control unit is configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one or more sensed conditions from the one or more sensors.
3 . The brake system of claim 1 , wherein the main pump comprises a piston pump and the backup energy source comprises a gear pump.
4 . The brake system of claim 1 , wherein the primary control valve and the secondary control valve each comprise an electronically controlled proportional valve.
5 . The brake system of claim 1 , wherein the primary enable valve and the secondary enable valve each comprise one of a two-way on/off valve or a three-way on/off valve.
6 . The brake system of claim 1 , further comprising one or more further shuttle valves in fluid communication with one or more of the at least one brake, the main pump, the backup energy source, the primary valve set, and the secondary valve set.
7 . The brake system of claim 6 , wherein the one or more further shuttle valves comprise one of a non-bias shuttle valve and a spring bias axle shuttle valve.
8 . The brake system of claim 1 , further comprising a third valve set having a control valve and an enable valve, wherein the third valve set is configured as a trailer brake circuit.
9 . The brake system of claim 1 , further comprising a foot brake valve communicatively coupled to a pair of shuttle valves, wherein the control unit is configured to control semi-autonomous braking operation using the main pump, the backup energy source, the primary valve set, the secondary valve set, and the pair of shuttle valves.
10 . A method for autonomous braking, the method comprising:
determining an operating condition of at least one brake of a vehicle to be in a normal braking condition or a failure braking condition;
controlling a primary valve set having a primary control valve in series with a primary enable valve to apply braking force to the at least one brake in response to a determination of the normal braking condition;
controlling a secondary valve set having a secondary control valve in series with a secondary enable valve to apply braking force to the at least one brake in response to a determination of the failure braking condition; and
controlling application of braking force to the at least one brake via the primary valve set or secondary valve set with a first shuttle valve positioned between the at least one brake and the primary valve set and the secondary valve set.
11 . The method of claim 10 , further comprising using one of a main pump or a backup energy source to generate the applied braking force.
12 . The method of claim 11 , wherein the main pump comprises a piston pump and the backup energy source comprises a gear pump.
13 . The method of claim 10 , wherein the primary control valve and the secondary control valve each comprise an electronically controlled proportional valve.
14 . The method of claim 10 , wherein the primary enable valve and the secondary enable valve each comprise one of a two-way on/off valve or a three-way on/off valve.
15 . The method of claim 11 , further comprising controlling application of braking force using one or more additional shuttle valves in fluid communication with one or more of the at least one brake, the main pump, the backup energy source, the primary valve set, the secondary valve set, and the first shuttle valve.
16 . The method of claim 14 , wherein the one or more additional shuttle values comprise one of a non-bias shuttle valve and a spring bias axle shuttle valve.
17 . A vehicle for ground working operation in a field, the vehicle comprising:
a plurality of wheels;
a chassis supported on the plurality of wheels and configured for moveable operation, the chassis configured with attachment points for movable coupling to a work tool; and
a brake system configured to apply brakes to one of slow or stop rotation of the plurality of wheels, the brake system comprising:
at least one brake;
a main pump;
a backup energy source;
a primary valve set having a primary control valve in series with a primary enable valve;
a secondary valve set having a secondary control valve in series with a secondary enable valve;
a first shuttle valve in fluid communication with the primary valve set, the secondary valve set, and the at least one brake, wherein the first shuttle valve is positioned between the at least one brake and the primary valve set and the secondary valve set,
wherein the at least one brake, the main pump, the backup energy source, the primary valve set, and the secondary valve set are in fluid communication; and
a control unit configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one of a normal braking condition or a failure braking condition.
18 . The vehicle of claim 17 , wherein the brake system further comprises one or more sensors communicatively coupled with one or more of the main pump, the backup energy source, the primary valve set, and the secondary valve set, wherein the control unit is configured to control operation of the main pump, the backup energy source, the primary valve set, and the secondary valve set in response to one or more sensed conditions from the one or more sensors.
19 . The vehicle of claim 17 , wherein the primary control valve and the secondary control valve each comprise an electronically controlled proportional valve, and the primary enable valve and the secondary enable valve each comprise one of a two-way on/off valve or a three-way on/off valve.
20 . The vehicle of claim 17 , wherein the brake system further comprises a foot brake valve communicatively coupled to a pair of shuttle valves, and the control unit is configured to control semi-autonomous braking operation using the main pump, the backup energy source, the primary valve set, the secondary valve set, and the pair of shuttle valves.