Adaptive underspeed control

• US 20100161186A1
• Filed: 12/22/2008
• Published: 06/24/2010
• Est. Priority Date: 12/22/2008
• Status: Active Grant

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Quinn, Terrence A., Oudyn, Michael K., Poulet, Christian, Strashny, Igor M.
• Granted Patent: US 8,175,780 B2
• Time in Patent Office: Days
• US Class Current: 701/54
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/103 of fluid type
• CPC Class Codes: B60W 10/30 including control of auxiliary equipment, e.g. air-conditioning compressors or oil pumps
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 30/1886 Controlling power supply to auxiliary devices
• CPC Class Codes: E02F 9/2246 Control of prime movers, e.g. depending on the hydraulic load of work tools
• CPC Class Codes: E02F 9/26 Indicating devices E02F5/145 takes precedence
• CPC Class Codes: F16H 2059/6861 the pressures, e.g. high, low or differential pressures

Abstract

A machine (100) includes an engine (102) connected to an implement pump (204) operating an actuator and to a propel pump operating a motor (106). An electronic controller (218) is disposed to receive at least one parameter selected from the group of: a pressure of fluid at the at least one motor (106), a pressure of fluid at the at least one implement actuator, a rate of rotation of the engine (102), a rate of rotation of the at least one motor (106), and a torque output of the engine (102). The electronic controller (218) monitors the at least one parameter for a predetermined period, and determines an operating mode of the machine (100). The electronic controller (218) then adjusts an underspeed setting for the engine (102) based on the operating mode.

Claims

1. A machine having at least one motor operable to propel the machine and to at least one implement actuator, the machine having an engine operative at a speed controlled by an underspeed setting, the machine comprising:

at least one transmission connected to the at least one motor operating to propel the machine;

an electronic controller associated with the machine, the electronic controller disposed to receive data corresponding to at least one machine operating parameter relative to the at least one transmission;

the electronic controller being further disposed to process the data corresponding to the at least one machine operating parameter to determine an operating mode of the machine and to adapt the underspeed setting for the engine based on the operating mode.

2. The machine of claim 1, wherein the electronic controller is arranged to collect and aggregate the at least one machine operating parameter for a predetermined period.

3. The machine of claim 1, wherein the at least one machine operating parameter is selected from a group consisting of:

a pressure of fluid at the at least one motor, a pressure of fluid at at least one implement actuator, a rate of rotation of the engine, a rate of rotation of the at least one motor, a gear setting of the at least one transmission, and a torque output of the engine.

4. The machine of claim 1, wherein the at least one machine operating parameter includes:

a first parameter, which is indicative of a pressure of fluid at the at least one motor; and

a second parameter, which is indicative of a pressure of fluid at the at least one implement actuator.

5. The machine of claim 4, wherein the electronic controller is disposed to process the first parameter and the second parameter to provide a histogram graph.

6. The machine of claim 5, wherein the electronic controller is disposed to determine the operating mode of the machine based on information contained in the histogram graph.

7. The machine of claim 1, further including a second motor, wherein the second motor is connected to a second transmission.

8. The machine of claim 7, wherein the at least one transmission and the second transmission are connected to a torque splitter, and wherein the torque splitter is connected to the engine and arranged to transmit power from the engine to the at least one transmission and the second transmission.

9. A method for operating a machine having a tractive system and one or more power consuming systems, comprising:

operating an engine at an engine speed that is above an underspeed setpoint;

generating power from operation of the engine;

splitting power generated into tractive power and into power consumed by the one or more power consuming systems;

consuming power by the tractive system of the machine;

consuming power by the one or more power consuming systems of the machine;

detecting tractive information relative to power consumed by the tractive system of the machine;

detecting respective power consumption information relative to power consumed by each of the one or more power consuming systems of the machine;

processing tractive information and each respective power consumption information and determining an inferred usage profile for the machine;

determining an operating mode of the machine based on the inferred usage profile; and

adapting an underspeed set cut-in rate based on the determined operating mode.

10. The method of claim 9, further including detecting at least one parameter relative to the operation of the engine that is selected from a group consisting of:

engine speed, engine torque, and engine fueling rate.

11. The method of claim 9, wherein detecting tractive information includes detecting at least one of a pressure of hydraulic fluid and a flow rate of hydraulic fluid flowing through at least a portion of the tractive system of the machine.

12. The method of claim 9, wherein detecting tractive information includes detecting at least one of a electrical voltage and an electrical current.

13. The method of claim 9, wherein processing the tractive information and the respective consumption information includes providing a histogram with respect to time.

14. The method of claim 13, wherein determining the inferred usage profile includes interpreting a distribution of values in the histogram.

15. A control algorithm for improving productivity and power utilization of a machine, the machine being propelled by a propel circuit and performing tasks with an implement powered by an implement circuit, the control algorithm being executed within an electronic controller associated with the machine, the electronic controller disposed to receive information from the propel circuit and the implement circuit, the control algorithm performing the computer implemented steps of:

accessing information provided from at least one sensor disposed on the machine, the at least one sensor disposed to measure machine parameter in at least one of the propel circuit and the implement circuit;

monitoring information collected from the at least one sensor for a duration of time;

calculating a usage profile for the machine based on the information monitored from the at least one sensor;

determining a mode of operation of the machine based on the usage profile; and

adaptively adjusting desired underspeed cut-in rate for the machine based on the determined mode of operation.

16. The control algorithm of claim 15, wherein the step of monitoring information collected from the at least one sensor includes calculating a histogram with respect to time.

17. The control algorithm of claim 15, further including the steps of accessing information relative to operation of an engine associated with the machine, and calculating an engine power output parameter based on an engine map lookup function, wherein calculating the usage profile is further based on the engine power output parameter.

18. The control algorithm of claim 15, wherein the at least one sensor is disposed to measure a pressure of hydraulic fluid in the propel circuit, and wherein an additional sensor is disposed to measure a pressure of hydraulic fluid in the implement circuit.

19. The control algorithm of claim 18, wherein the at least one sensor generates a first parameter, which is indicative of power consumed by the propel circuit, and wherein the additional sensor generates a second parameter, which is indicative of power consumed by the implement circuit, and wherein the mode of operation is determined based on the first parameter and the second parameter.

20. The control algorithm of claim 15, wherein setting the desired underspeed cut-in rate is accomplished without an input command from an operator of the machine.