System and method for controlling compactor systems

1. A method for controlling the operation of a waste compactor having a hydraulic ram and a hydraulic pump operative for applying hydraulic pressure to advance and retract the ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a measurable fluid having a viscosity, the method comprising the steps of:

establishing a maximum pressure for the hydraulic pressure;

establishing extend and retract time constraints for the hydraulic ram;

operating the hydraulic ram;

monitoring the hydraulic pressure while the hydraulic ram is operated;

estimating the viscosity of the fluid; and

adjusting the extend and retract time constraints based on the estimated viscosity.

2. The method of claim 1 wherein the step of monitoring the hydraulic pressure comprises a pressure transducer.

3. The method of claim 2 wherein the pressure transducer is a digital pressure transducer.

4. The method of claim 2 wherein the step of estimating the viscosity of the fluid comprises the steps of:

application and removal of pressure to the pressure transducer; and

monitoring a decay envelope associated with the pressure.

5. The method of claim 1 wherein the step of estimating the viscosity of the fluid occurs in substantially real-time.

6. A method for controlling the operation of a waste compactor having a hydraulic ram and a hydraulic pump operative for applying hydraulic pressure to advance and retract the ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a fluid having a viscosity, the method comprising the steps of:

operating the hydraulic ram;

calculating empirical time constraints and maximum pressure readings for the hydraulic ram;

monitoring the hydraulic pressure while the hydraulic ram is operated;

estimating the viscosity of the fluid; and

adjusting the empirical time constraints based on the estimated viscosity of the fluid.

7. The method of claim 6 wherein the step of monitoring the hydraulic pressure comprises a pressure transducer.

8. The method of claim 7 wherein the pressure transducer is a digital pressure transducer.

9. The method of claim 7 wherein the step of estimating the viscosity of the fluid comprises the steps of:

sending pressure to the pressure transducer; and

monitoring a decay envelope associated with the pressure.

10. The method of claim 6 wherein the step of calculating empirical time constraints and maximum pressure readings comprises the steps of:

operating the hydraulic ram for a set period of time;

recording the maximum pressure during the set period of time;

establishing a maximum pressure reading;

clearing an extend timer associated with the hydraulic ram;

starting the extend timer;

monitoring the hydraulic pressure;

extending the hydraulic ram until the hydraulic pressure reaches the maximum pressure reading; and

stopping the extend timer and recording the maximum extend time.

11. The method of claim 10 , wherein the step of calculating empirical time constraints and maximum pressure readings further comprises the steps of:

clearing a retract timer associated with the hydraulic ram;

starting the retract timer;

monitoring the hydraulic pressure;

retracting the hydraulic ram until the hydraulic pressure reaches the maximum pressure reading; and

stopping the retract timer and recording the maximum retract time.

12. The method of claim 10 wherein the maximum pressure reading is less than the recorded maximum pressure.

13. The method of claim 10 wherein the maximum pressure reading is substantially equal to the recorded maximum pressure.

14. The method of claim 6 wherein the step of estimating the viscosity of the fluid occurs in substantially real-time.

15. A system for controlling the operation of a compactor system having a hydraulic ram and a hydraulic pump operative for applying hydraulic pressure to advance and retract the ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a fluid having a measurable viscosity, the system comprising:

means for establishing a maximum pressure for the hydraulic pressure;

means for establishing time constraints for the hydraulic ram;

a pressure transducer for monitoring the hydraulic pressure while the hydraulic ram is operated;

means for estimating the viscosity of the fluid; and

means for adjusting the time constraints pressure based on the estimated viscosity.

16. The system for controlling the operation of a waste compactor of claim 15 which further comprises:

means for operating the hydraulic ram until the hydraulic pressure reaches the maximum pressure.

17. The system for controlling the operation of a waste compactor of claim 15 which further comprises:

means for establishing a maximum extend time and a maximum retract time for the hydraulic ram; and

means for adjusting the maximum extend time and maximum retract time based on the estimated viscosity.

18. The system for controlling the operation of a waste compactor of claim 15 which further comprises:

means for timing the extension and retraction of the hydraulic ram;

means for operating the hydraulic ram for a first time period until the first time period for the extension of the hydraulic ram reaches the maximum extend time or the hydraulic pressure reaches the maximum pressure; and

means for operating the hydraulic ram for a second time period until the second time period for the retraction of the hydraulic ram reaches the maximum retract time or the hydraulic pressure reaches the maximum pressure.

19. The system for controlling the operation of a waste compactor of claim 15 wherein the viscosity of the fluid is estimated in substantially real-time.

20. A system for controlling the operation of a waste compactor having a hydraulic ram and a hydraulic pump operative for applying hydraulic pressure to advance and retract the ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a fluid having a viscosity, the system comprising:

a hydraulic pressure sensor for measuring the hydraulic pressure, and

a processor for executing a plurality of prestored instructions including:

instructions for retracting the hydraulic ram for a set period of time and recording a maximum pressure;

instructions for establishing a maximum pressure reading;

instructions for extending the hydraulic ram until the hydraulic pressure reaches the maximum pressure reading;

instructions for recording the time it takes for the hydraulic pressure to reach the maximum pressure reading during the extending of the hydraulic ram; and

instructions for establishing a maximum extend time.

21. A system for controlling the operation of a compactor system having a hydraulic ram and a hydraulic pump operative for applying hydraulic pressure to advance and retract the ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a fluid having a viscosity, the system comprising:

a pressure transducer for measuring the hydraulic pressure; and

a processor for executing a plurality of prestored instructions including:

instructions for retracting the hydraulic ram for a set period of time and recording a maximum pressure;

instructions for establishing a maximum pressure reading;

instructions for extending the hydraulic ram until the hydraulic pressure reaches the maximum pressure reading;

instructions for recording the time it takes for the hydraulic pressure to reach the maximum pressure reading during the extending of the hydraulic ram; and

instructions for establishing a maximum extend time.

22. The system for controlling the operation of a compactor system of claim 21 wherein the maximum pressure reading is the recorded maximum pressure.

23. The system for controlling the operation of a compactor system of claim 21 wherein the maximum pressure reading is a value less than the recorded maximum pressure.

24. The system for controlling the operation of a compactor system of claim 21 wherein the process further comprises:

instructions for retracting the hydraulic ram until the hydraulic pressure reaches the maximum pressure reading;

instructions for recording the time it takes for the hydraulic pressure to reach the maximum pressure reading during the retraction of the hydraulic ram; and

instructions for establishing a maximum retract time.

25. A system for controlling the operation of a compactor system comprising:

a waste container for receiving waste material;

a hydraulic ram;

a hydraulic pump operative for applying hydraulic pressure to advance and retract the hydraulic ram during compacting strokes of the compactor, wherein the hydraulic pump comprises a fluid having a viscosity;

a pressure sensor; and

a processor operatively connected to the pressure sensor and the hydraulic ram to operate the hydraulic ram and calculate a maximum pressure for the hydraulic pressure, estimate the viscosity of the fluid and adjust the maximum pressure based on the estimated viscosity.

26. The system for controlling the operation of a compactor system of claim 25 wherein the pressure sensor comprises a pressure transducer.

27. The system for controlling the operation of a compactor system of claim 25 which further comprises means to time the compacting strokes of the compactor, and wherein the processor also calculates empirical time constraints for the operation of the hydraulic ram and adjusts the empirical time constraints based on the estimated viscosity.

28. The system for controlling the operation of a compactor system of claim 25 wherein the processor operates the hydraulic ram until the hydraulic pressure reaches the maximum pressure.

29. The system for controlling the operation of a compactor system of claim 27 wherein the processor operates the hydraulic ram until the hydraulic pressure reaches the maximum pressure or the empirical time constraints are reached.

30. A system for controlling the operation of a compactor system comprising:

a waste container for receiving waste material;

a hydraulic ram;

a hydraulic pump operatively connected to the hydraulic ram for applying hydraulic pressure to advance and retract the hydraulic ram during compacting strokes of the compactor,

said hydraulic pump comprising a hydraulic fluid having a measurable viscosity;

means for measuring changes in the viscosity of the hydraulic fluid;

means for monitoring the fullness of the waste container operably associated with the hydraulic ram; and

means for controlling the advancing and retracting of the hydraulic ram during the compacting strokes of the compactor based on changes to the viscosity of the hydraulic fluid.