Conditioning a performance metric for an operator display

• US 8,965,640 B2
• Filed: 11/30/2012
• Issued: 02/24/2015
• Est. Priority Date: 11/30/2012
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Faivre, Joseph, Doy, Nathaniel, Cowper, Lance
• Primary Examiner(s): Badii, Behrang
• Assistant Examiner(s): TESTARDI, DAVID A
• Application Number:
  US13/690,894
• Publication Number:
  US 20140156105A1
• Time in Patent Office: 816 Days
• Field of Search: 701/1, 701/50, 701/123, 340/439
• US Class Current: 701/50
• CPC Class Codes: B60W 2050/146 Display means
• CPC Class Codes: B60W 50/14 Means for informing the driver, warning the driver or prompting a driver intervention
• CPC Class Codes: G05B 23/0294 Optimizing process, e.g. process efficiency, product quality
• CPC Class Codes: G07C 5/00 Registering or indicating the working of vehicles
• CPC Class Codes: G07C 5/0825 using optical means

Abstract

Real time determination of current vs. optimum performance in a track-type tractor is complex and requires information about both a state of the tractor and the operating environment, such as soil conditions. Presenting such data to an operator creates a problem of conveying sufficient information without undue complexity. A three part display for an operator shows a full range of performance, a subset range of performance associated with peak performance that is overlaid on the full range of performance, and a current performance indicator also overlaid on the full range of performance, such that peak performance is achieved when the current performance indicator is centered on the subset range of performance. The subset range of performance may move over the full range of performance to indicate operating conditions favoring a particular condition, e.g., low slip. An operator may then effect a change by adjusting, for example, speed or load.

Claims

1. A track-type tractor incorporating a system for preparing and presenting optimum performance, the system comprising:

a processor;

a display coupled to the processor;

a plurality of sensors configured to provide operating condition data and operating state data to the processor; and

a memory coupled to the processor, wherein the memory stores computer-executable instructions that cause the processor to;

process the operating condition data and the operating state data into a current performance value;

process the operating condition data and the operating state data into a set of performance values over a range of input values, the input values including at least one of drawbar pull, track speed, track slip, blade load, or blade height;

identify an optimum input value from the range of input values corresponding to an optimum performance value from the set of performance values;

generate target input values as a subset of the range of input values selected to include the optimum input value;

unevenly weight the target input values compared to input values outside the target input values;

display the weighted target input values; and

display the current performance value relative to the weighted target input values.

2. The track-type tractor of claim 1, wherein the processor unevenly weights the target performance values by:

selecting the target input values to be within a range of the optimum input value;

increasing a first step size between values in the target input values; and

decreasing a second step size between values outside the target input values so that the display of unevenly weighted values presents the target values in a proportionally larger span on the display than a span of values outside the subset.

3. The track-type tractor of claim 2, wherein the target input values are in a span of 10%-20% of the optimum input value.

4. The track-type tractor of claim 2, wherein the target input values are in a span of 5%-10% of the optimum performance value.

5. A method of preparing and presenting an optimum performance in a track-type tractor, the method comprising:

providing a track-type tractor;

receiving inputs from the track-type tractor related to a current operating condition and a current operating state, wherein the operating state includes an operational element under the control of an operator and the inputs include at least one of drawbar pull, track speed, track slip, blade load, or blade height;

iteratively solving, using a processor of the track-type tractor, a performance calculation over a range of input values of the operational element to determine a set of output performance values and a peak output value of the performance calculation, wherein the peak output value of the performance calculation corresponds to the optimum performance of the track-type tractor;

determining an optimum input value associated with the peak output value;

determining a target range of input values that includes the optimum input value, the target range of input values being a subset of the range of input values;

normalizing a current value of the operational element to the optimum input performance to produce a normalized current performance; and

displaying the normalized current performance and the target range of input values for optimizing performance of the track-type tractor.

6. The method of claim 5, further comprising:

determining a value of a second operational element of the operating state; and

determining a second peak performance value of the track-type tractor in terms of the second operational element, wherein the peak output value is a function of the performance calculation and the second peak performance value.

7. The method of claim 5, wherein displaying the normalized current performance and the target range of input values comprises displaying the performance indicator and the full range of values of performance, absent units of measure.

8. The method of claim 5, wherein determining the target range of input values comprises selecting to be within 10% of the optimum input value compared to the range of input values of the operational element.

9. The method of claim 5, wherein the range of input values are a range of track speed values.

10. The method of claim 5, wherein the range of input values are a range of track slip values.

11. The method of claim 5, wherein the normalized current performance value is displayed to the right of a center of the target range when the current value of the operational element is less than the optimum input value associated with the peak output value.

12. The method of claim 11, wherein the optimum input value is an optimum track speed value.

13. A non-transitory computer-readable memory having computer-executable instructions implementing modules for execution on a processor of a track-type tractor, the modules comprising:

an input module that receives data from sensors corresponding to both an operating condition of the track-type tractor and an operating state of the track-type tractor;

a performance module that calculates a cycle power value for the track-type tractor, the cycle power value being calculated in terms of track speed;

an optimizer module that calculates performance levels for a range of input states and identifies an optimum performance level and an optimum operating state of the track-type tractor;

a scaling module that prepares a weighted target range as a non-linear representation of performance values so that the weighted target range is a subset of performance values centered at the optimum performance level and is weighted more heavily than performance values outside the weighted target range; and

a normalization module that divides the cycle power value by the optimum performance level to create a normalized performance level; and

a display module that presents, to a display, the normalized performance level relative to the weighted target range for use by an operator in adjusting the current operating state of the track-type tractor.

14. The non-transitory computer-readable memory of claim 13, wherein the scaling module further comprises code that scales performance values outside the target range to proportionally reduce a weight of performance values outside the target range.

15. The non-transitory computer-readable memory of claim 13, wherein the scaling module identifies the target range as performance values within a range of 10% to 20% of the optimum performance level.

16. The non-transitory computer-readable memory of claim 13, further comprising a sign module that signals the display module to display the normalized performance level to the right or the left of the optimum performance level, when the values are not equal.

17. The non-transitory computer-readable memory of claim 13, wherein the data corresponding to the operating state includes track speed and the performance module calculates the cycle power value based on measured performance.

18. The non-transitory computer-readable memory of claim 13, wherein the data corresponding to the operating state excludes ground speed and the optimizer module calculates optimum performance based on pull-weight ratio performance data and track speed performance data.

19. The non-transitory computer-readable memory of claim 18, wherein the optimizer module inverts the track speed performance data to align a lower track speed with a larger load.