Lubrication control system for a work machine

• US 5,823,295 A
• Filed: 03/29/1996
• Issued: 10/20/1998
• Est. Priority Date: 03/29/1996
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Griffith, Bobby D., Hawkins, Mark R., Schlickbernd, Dean J., Zmuda, Steven J.
• Primary Examiner(s): VERDIER, CHRISTOPHER M
• Application Number:
  US08/624,151
• Time in Patent Office: 935 Days
• Field of Search: 184/6, 184/6.4, 184/6.19, 184/7.2, 184/29, 184/31, 123/196 R, 123/196 S, 123/565, 137/487.5, 137/355.26, 137/355.27, 417/44.1, 417/44.11
• US Class Current: 184/6.4
• CPC Class Codes: F16N 2230/10 Timing network
• CPC Class Codes: F16N 2250/04 Pressure
• CPC Class Codes: F16N 29/02 for influencing the supply of lubricant
• CPC Class Codes: F16N 7/385 Central lubrication systems

Abstract

A control system for lubricating a work machine is provided. The control system includes a lubricant distribution system, a charging system adapted to drive the lubricant distribution system, a sensor for determining the operating state of the charging system, and a device for calculating a time interval being dependent upon a previous lubricating event. The control also includes a device for producing a lubrication signal in response to the time interval reaching a predetermined interval constant.

Claims

1. An apparatus for lubricating a work machine, comprising:

a timer;

a lubricant distribution system, said lubricant distribution system comprising an automatic lubrication system and a manual lubrication system, said automatic lubrication system including lubricant injector banks and said manual lubrication system including a grease reel;

means for determining a lubrication mode and responsively producing a lubrication mode signal;

a charging system adapted to drive said lubricant distribution system;

means for sensing a charging system parameter indicative of the operating state of said charging system;

means for causing said timer to calculate a time interval, said time interval being dependent on a previous lubricating event;

means for producing a first lubrication signal in response to said time interval being greater than or equal to a predetermined interval constant and said charging system parameter being greater than or equal to a predetermined level;

means for producing a second lubrication signal in response to said charging system parameter being greater than or equal to a predetermined level and said lubrication mode signal being greater than a predetermined value; and

means for activating said lubricant distribution system in response to said first lubrication signal and said second lubrication signal.

2. An apparatus as recited in claim 1, further comprising a lubricant diverter fluidly connected to said automatic lubrication system and to said manual lubrication system.

3. An apparatus as recited in claim 2, wherein said means for determining includes a manually activated switch, said switch connected to said lubricant diverter, such that when said switch is activated, said lubricant diverter diverts the flow of lubricant from the lubricant injector banks to the grease reel.

4. An apparatus as recited in claim 1, wherein said charging system includes a charging system supply line, a lubrication pump, and an actuator connected to and between said charging system supply line and said lubrication pump, said actuator being adapted to allow fluid from said charging system supply line to flow to said lubrication pump in response to said lubrication signal, whereby said lubrication pump is driven by fluid from said charging system supply line when said lubrication signal is delivered to said actuator.

5. An apparatus as recited in claim 1, including:

means for sensing a pressure in said lubrication system and responsively producing a pressure signal; and

fault means for receiving said pressure signal and responsively identifying a fault condition.

6. An apparatus as recited in claim 5, wherein said fault means includes means for comparing said pressure signal to one of a plurality of predefined constants and responsively identifying said fault condition.

7. An apparatus as recited in claim 6, wherein said fault means identifies one of a normal condition, a high-pressure condition, and a low pressure condition.

8. An apparatus as recited in claim 7, wherein said fault means identifies a sensor fault condition.

9. An apparatus as recited in claim 8, wherein said fault means includes a message means for communicating an identified fault condition to an operator.

10. An apparatus as recited in claim 1, wherein said charging system parameter is engine speed.

11. An apparatus as recited in claim 1, wherein said charging system parameter is system supply pressure.

12. An apparatus as recited in claim 1, wherein said charging system parameter is an implement control signal.

13. An apparatus as recited in claim 1, wherein said charging system parameter is an electrical system control signal.

14. An apparatus as recited in claim 1, including means for modifying said predetermined interval constant.

15. An apparatus as recited in claim 1, including message means for communicating the lubricating mode to an operator.

16. An apparatus for lubricating a work machine, comprising:

a timer;

a lubricant distribution system, said lubricant distribution system comprising an automatic lubrication system and a manual lubrication system, said automatic lubrication system including lubricant injector banks and said manual lubrication system including a grease reel;

a lubricant diverter fluidly connected to said automatic lubrication system and to said manual lubrication system;

means for determining a lubrication mode and responsively producing a lubrication mode signal, said means for determining including a manually activated switch, said switch being connected with said lubricant diverter such that when said switch is activated, said lubricant diverter diverts the flow of lubricant between the automatic and manual lubrication systems;

a charging system adapted to drive said lubricant distribution system;

means for sensing a charging system parameter indicative of the operating state of said charging system;

means for causing said timer to calculate a time interval, said time interval being dependent on a previous lubricating event;

means for producing a first lubrication signal in response to said time interval being greater than or equal to a predetermined interval constant and said charging system parameter being greater than or equal to a predetermined level;

means for producing a second lubrication signal in response to said charging system parameter being greater than or equal to a predetermined level and said lubrication mode signal being greater than a predetermined value; and

means for activating said lubricant distribution system in response to said first lubrication signal and said second lubrication signal.