Engine power monitoring system

• US 6,094,617 A
• Filed: 12/23/1998
• Issued: 07/25/2000
• Est. Priority Date: 12/23/1998
• Status: Expired due to Term

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Lapke, Robert A.
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US09/219,965
• Time in Patent Office: 580 Days
• Field of Search: 701/102, 701/104, 701/107, 701/114, 701/115, 73/112, 73/116, 73/117.3, 123/350, 340/439
• US Class Current: 701/104
• CPC Class Codes: F02D 2041/228 Warning displays
• CPC Class Codes: F02D 2200/1015 Engines misfires
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 2250/31 Control of the fuel pressure
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/221 relating to the failure of actuators or electrically driven elements
• CPC Class Codes: G01M 15/046 by monitoring revolutions for detecting misfire G01M15/11
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A system for monitoring the output power of an engine associated with a work machine based upon monitoring the input and output speeds of a torque converter or torque divider coupled to the engine, the present system including a first sensor for determining engine speed, a second sensor for determining the throttle position of the engine, a third sensor for determining the output speed of the torque converter or torque divider, and an electronic controller coupled to the first, second and third sensors for receiving signals therefrom, the controller comparing the actual engine speed and the actual torque converter or divider output speed at a particular throttle setting to an engine speed and converter/divider output speed indicative of optimal or desired engine power output at that same throttle position and thereafter outputting a signal to a monitoring/warning system indicative of low engine power performance when the controller receives a signal from the third sensor indicative of the converter/divider output speed being less than a predetermined converter/divider output speed based upon optimal or desired engine performance at that particular throttle position.

Claims

1. A system for monitoring engine performance of a work machine wherein the work machine includes an engine coupled to a torque converter, said system comprising:

a first sensor for determining engine speed;

a second sensor for determining the throttle position of the engine;

a third sensor for determining the output speed of the torque converter;

an electronic controller coupled with said first, second and third sensors for receiving signals therefrom, said controller being operable to receive a signal from said first sensor indicative of the speed of the engine, a signal from said second sensor indicative of the throttle position of the engine, and a signal from said third sensor indicative of the output speed of the torque converter;

monitoring means for producing a signal indicative of low engine performance, said monitoring means being coupled to said electronic controller for receiving signals therefrom; and

memory means coupled to said controller and having stored therein a plurality of different engine speed and converter output speed correlations, each correlation representing the engine speed and converter output speed at a particular throttle position;

said controller outputting a signal to said monitoring means indicative of low engine power performance when said controller receives a signal from said first sensor indicative of the speed of the engine, a signal from said second sensor indicative of the throttle position of the engine, and a signal from said third sensor indicative of the converter output speed being less than a predetermined converter output speed, said predetermined converter output speed being determined from the engine speed and converter output speed correlation selected by said controller based upon signals received from said first and second sensors.

2. The system, as set forth in claim 1, wherein said predetermined converter output speed is equal to the converter output speed associated with the engine speed and converter output speed correlation selected by said controller based upon the signals received from said first and second sensors.

3. The system, as set forth in claim 1, wherein said predetermined converter output speed is adjusted for parasitic loads associated with the work machine.

4. The system, as set forth in claim 1, wherein the work machine includes at least one parasitic system which draws power from the engine, said system further comprising:

at least one additional sensor associated with said parasitic system for determining the parasitic load associated therewith, said controller being coupled to said at least one additional sensor for receiving signals therefrom, said controller being operable to receive a signal from said at least one additional sensor indicative of the parasitic load associated with said parasitic system,

said controller outputting a signal to said monitoring means indicative of a low engine power performance when said controller receives a signal from said third sensor and from said at least one additional sensor indicative of the converter output speed being less than said predetermined converter output speed.

5. The system, as set forth in claim 4, wherein said at least one parasitic system includes a fan pump.

6. The system, as set forth in claim 4, wherein said at least one parasitic system includes a implement pump.

7. The system, as set forth in claim 1, wherein the work machine includes a fuel injection control system for controlling the delivery of fuel to the engine;

said electronic controller being further coupled to the fuel injection control system and being capable of outputting signals to such fuel injection control system to control the amount of fuel being delivered to the engine;

said controller outputting a signal to the fuel injection control system to increase the amount of fuel being delivered to the engine when said controller receives a signal from said third sensor indicative of the converter output speed being less than said predetermined converter output speed.

8. The system, as set forth in claim 1, wherein the work machine includes an engine governor system for controlling the delivery of fuel to the engine;

said electronic controller being further coupled to the engine governor system and being capable of outputting signals to such engine governor system to control the amount of fuel being delivered to the engine;

said controller outputting a signal to the engine governor system to increase the amount of fuel being delivered to the engine when said controller receives a signal from said third sensor indicative of the converter output speed being less than said predetermined converter output speed.

9. The system, as set forth in claim 1, wherein said monitoring means includes display means for displaying a representation of the low engine performance signal.

10. The system, as set forth in claim 9, wherein said representation of the low engine performance signal includes a visual signal displayed in the operator compartment of the work machine.

11. The system, as set forth in claim 9, wherein said representation of the low engine performance signal includes an audio signal generated in the operator compartment of the work machine.

12. A system for monitoring engine performance of a work machine wherein the work machine includes an engine coupled to a torque converter, said system comprising:

a first sensor for determining engine speed;

a second sensor for determining the output speed of the torque converter;

an electronic controller coupled with said first and second sensors for receiving signals therefrom, said controller being operable to receive a signal from said first sensor indicative of the speed of the engine, and a signal from said second sensor indicative of the output speed of the torque converter;

monitoring means for producing a warning signal indicative of low engine power performance, said monitoring means being coupled to said electronic controller for receiving signals therefrom;

memory means coupled to said controller and having stored therein an engine speed and converter output speed correlation representative of the engine performance at the full throttle position;

said controller outputting a signal to said monitoring means when said controller receives a signal from said first sensor indicative of the speed of the engine, and a signal from said second sensor indicative of the converter output speed being less than a predetermined converter output speed, said predetermined converter output speed being determined from the engine speed and converter output speed correlation for operation of the engine at the full throttle position.

13. The system, as set forth in claim 12, wherein said predetermined converter output speed is equal to the converter output speed associated with the engine speed and converter output speed correlation for the full throttle position.

14. The system, as set forth in claim 12, wherein said predetermined converter output speed is adjusted for parasitic loads associated with the work machine.

15. The system, as set forth in claim 12, wherein the work machine includes at least one parasitic system which draws power from the engine, said system further comprising:

at least one additional sensor associated with said parasitic system for determining the parasitic load associated therewith, said controller being coupled to said at least one additional sensor for receiving signals therefrom, said controller being operable to receive a signal from said at least one additional sensor indicative of the parasitic load associated with said parasitic system,

said controller outputting a signal to said monitoring means when said controller receives a signal from said second sensor and from said at least one additional sensor indicative of the converter output speed being less than said predetermined converter output speed.

16. A system for monitoring engine performance of a work machine wherein the work machine includes an engine coupled to a torque divider, said system comprising:

a first sensor for determining engine speed;

a second sensor for determining the throttle position of the engine;

a third sensor for determining the output speed of the torque divider;

an electronic controller coupled with said first, second and third sensors for receiving signals therefrom, said controller being operable to receive a signal from said first sensor indicative of the speed of the engine, a signal from said second sensor indicative of the throttle position of the engine, and a signal from said third sensor indicative of the output speed of the torque divider;

monitoring means for producing a signal indicative of low engine performance, said monitoring means being coupled to said electronic controller for receiving signals therefrom; and

memory means coupled to said controller and having stored therein a plurality of different engine speed and torque divider output speed correlations, each correlation representing the engine speed and torque divider output speed at a particular throttle position;

said controller outputting a signal to said monitoring means indicative of low engine power performance when said controller receives a signal from said first sensor indicative of the speed of the engine, a signal from said second sensor indicative of the throttle position of the engine, and a signal from said third sensor indicative of the torque divider output speed being less than a predetermined torque divider output speed, said predetermined torque divider output speed being determined from the engine speed and torque divider output speed correlation selected by said controller based upon signals received from said first and second sensors.

17. The system, as set forth in claim 16, wherein said predetermined torque divider output speed is equal to the torque divider output speed associated with the engine speed and torque divider output speed correlation selected by said controller based upon the signals received from said first and second sensors.

18. The system, as set forth in claim 16, wherein said predetermined torque divider output speed is adjusted for parasitic loads associated with the work machine.