Apparatus and method for determing a condition of a road

• US 5,736,939 A
• Filed: 12/11/1996
• Issued: 04/07/1998
• Est. Priority Date: 12/11/1996
• Status: Expired due to Fees

• Current Assignee: Caterpillar Incorporated
• Original Assignee: Caterpillar Incorporated
• Inventors: Corcoran, Paul T.
• Primary Examiner(s): SWARTHOUT, BRENT
• Application Number:
  US08/763,649
• Time in Patent Office: 482 Days
• Field of Search: 340/905, 340/901, 340/425.5, 340/447, 340/438, 364/424.07, 364/423.098, 180/167, 180/271
• US Class Current: 340/905
• CPC Class Codes: B60T 8/172 Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters B60T8/17551 takes precedence
• CPC Class Codes: G01G 19/08 for incorporation in vehicles
• CPC Class Codes: G01N 2203/021 Treatment of the signal; Calibration
• CPC Class Codes: G01N 3/40 Investigating hardness or rebound hardness
• CPC Class Codes: G01N 33/42 Road-making materials G01N33/38 takes precedence

Abstract

An apparatus and method to determine a condition of a road traversed by at least one load hauling machine including at least one parameter sensor adapted to sense a parameter of the load hauling machine and responsively deliver a parameter signal, and a control system adapted to monitor a condition of a plurality of tires and responsively generate a calibration signal.

Claims

1. An apparatus for determining a condition of a road traversed by at least one load hauling machine having a plurality of tires in contact with said road, comprising:

at least one parameter sensor connected to said load hauling machine, said at least one parameter sensor being adapted to sense a parameter of said load hauling machine and responsively deliver a parameter signal; and

a control system connected to said load hauling machine, said control system being adapted to monitor a condition of said tires and responsively generate a calibration signal, and to receive said parameter signal and determine a condition of said road in response to said parameter signal and said calibration signal.

2. An apparatus, as set forth in claim 1, wherein said at least one parameter sensor is a power sensor adapted to sense a power delivered by said load hauling machine and wherein said parameter signal is a power signal;

said apparatus further includes a position sensor adapted to sense a position of said load hauling machine and deliver a responsive position signal; and

wherein said control system is adapted to receive said power signal and said position signal and responsively determine a machine motion resistance.

3. An apparatus, as set forth in claim 2, wherein said at least one parameter sensor includes a slope sensor adapted to sense a slope of the grade of said road and wherein said machine motion resistance is a function of said slope.

4. An apparatus, as set forth in claim 3, wherein said slope sensor includes an inclinometer.

5. An apparatus, as set forth in claim 2, wherein said control system is adapted to receive said position signal and responsively determine a slope of the grade of said road and wherein said machine motion resistance is a function of said slope.

6. An apparatus, as set forth in claim 2, wherein said at least one parameter sensor includes an acceleration sensor adapted to sense an acceleration of said load hauling machine and wherein said machine motion resistance is a function of said acceleration.

7. An apparatus, as set forth in claim 6, wherein said acceleration sensor includes an accelerometer.

8. An apparatus, as set forth in claim 2, wherein said control system is adapted to receive said position signal and responsively determine an acceleration of said load hauling machine and wherein said machine motion resistance is a function of said acceleration.

9. An apparatus, as set forth in claim 2, wherein said position sensor includes a global positioning satellite (GPS) system.

10. An apparatus, as set forth in claim 2, wherein said position sensor includes a local reference positioning system.

11. An apparatus, as set forth in claim 10, wherein said local reference positioning system includes a laser positioning system.

12. An apparatus, as set forth in claim 2, including a tire condition sensor adapted to deliver a tire condition signal.

13. An apparatus, as set forth in claim 12, wherein said control system is adapted to receive said tire condition signal and responsively calculate said calibration signal.

14. An apparatus, as set forth in claim 2, including a load sensor adapted to deliver a load signal.

15. An apparatus, as set forth in claim 14, wherein said control system is adapted to receive said machine motion resistance signal and said load signal and responsively generate said calibration signal as said load hauling machine traverses a reference section of said road, said reference section being in a known and controlled condition.

16. A method for determining a condition of a road traversed by at least one load hauling machine having a plurality of tires in contact with said road, including the steps of:

sensing at least one parameter of said load hauling machine and responsively delivering a parameter signal;

determining a machine motion resistance in response to said parameter signal;

monitoring a condition of said tires and responsively generating a calibration signal; and

receiving said calibration signal and determining a condition of said road in response to said machine motion resistance and said calibration signal.

17. A method, as set forth in claim 16, further including the step of determining the position of said load hauling machine where said condition is determined.

18. A method, as set forth in claim 17, including the steps of:

sensing a slope of the grade of said road and responsively determining a slope resistance of said road as a function of said parameter signal;

sensing a power delivered by said load hauling machine and responsively determining a total power consumed by said load hauling machine as a function of said parameter signal;

determining a drivetrain power loss of said load hauling machine and a transient power consumption of said load hauling machine as functions of said parameter signal; and

receiving said slope resistance, said total power consumed, said drivetrain power loss, and said transient power consumption and responsively calculating said machine motion resistance.

19. A method, as set forth in claim 18, wherein the step of determining said slope resistance includes the steps of:

sensing a first value of elevation at a first position of said load hauling machine on said road;

sensing a second value of elevation at a second position of said load hauling machine on said road;

determining said slope of the grade of said road from said first position to said second position in response to the difference between said first value of elevation and said second value of elevation; and

calculating said slope resistance from said first position to said second position in response to said slope.

20. A method for determining a condition of a road traversed by at least one load hauling machine having a plurality of tires in contact with said road, including the steps of:

traversing a reference section of said road, said reference section being in a known and controlled condition;

sensing at least one parameter of said load hauling machine and responsively delivering a parameter signal;

determining a load on said tires;

determining a machine motion resistance relative to the load in response to said parameter signal;

comparing said machine motion resistance relative to said load to a reference machine motion resistance; and

generating a calibration signal in response to a difference between said machine motion resistance relative to said load and said reference machine motion resistance; and

determining a condition of said road in response to said calibration signal.

21. An apparatus for determining a condition of a road traversed by at least one load hauling machine having a plurality of tires in contact with said road, comprising:

a slope sensor adapted to sense a slope of the grade of said road and deliver a responsive slope signal;

a power sensor adapted to sense a power delivered by said load hauling machine and deliver a responsive power signal;

an acceleration sensor adapted to sense an acceleration of said load hauling machine and deliver a responsive acceleration signal;

a position sensor adapted to sense a position of said load hauling machine and deliver a responsive position signal; and

a control system connected to said load hauling machine, said control system being adapted to monitor a condition of said tires and responsively generate a calibration signal, and to receive said slope signal, said power signal, said acceleration signal, and said position signal and determine a condition of said road in response to said slope signal, said power signal, said acceleration signal, said position signal, and said calibration signal.