Controlled resurfacing of roads and the like

• US 4,473,319 A
• Filed: 04/27/1982
• Issued: 09/25/1984
• Est. Priority Date: 04/27/1982
• Status: Expired due to Term

• Current Assignee: Surface Dynamics Inc.
• Original Assignee: Surface Dynamics Inc.
• Inventors: Spangler, Elson B.
• Primary Examiner(s): Leppink, James A.
• Assistant Examiner(s): Hjorth, Beverly E.
• Application Number:
  US06/372,323
• Time in Patent Office: 882 Days
• Field of Search: 404/84, 404/72, 299/1, 172/2, 172/4, 172/4.5, 37/108 R, 37/DIG. 20, 73/146
• US Class Current: 404/72
• CPC Class Codes: B60G 17/0165 to an external condition, e.g. rough road surface, side wind
• CPC Class Codes: B60G 2400/821 Uneven, rough road sensing affecting vehicle body vibration
• CPC Class Codes: B60G 2500/30 Height or ground clearance
• CPC Class Codes: B60G 2800/914 Height Control System
• CPC Class Codes: E01C 23/07 Apparatus combining measurement of the surface configuration of paving with application of material in proportion to the measured irregularities measuring means only E01C23/01 G01B
• CPC Class Codes: E01C 23/088 Rotary tools, e.g. milling drums for forming recesses to receive marking materials E01C23/0946
• CPC Class Codes: G01B 7/28 for measuring contours or curvatures
• CPC Class Codes: Y10S 37/907 Automatic leveling excavators

Abstract

A method of resurfacing a road or the like wherein existing surface profile is first measured as a function of distance over the road surface. A desired profile is then identified as a function of measured road profile by simulating travel of a vehicle over the road surface and observing the quality of vehicle ride and/or pavement dynamic load while the spatial wavelength characteristics of measured profile are progressively attenuated. When ride quality and/or dynamic load of desired preselected standard is obtained, a resurface control signal is obtained as a conjoint function of distance along the road surface and the difference between measured profile and spatially attenuated profile. Road resurfacing equipment is also disclosed for selective removal of pavement surface material or selective deposition of paving material as a function of the control signal so obtained to achieve the desired resurfaced road profile.

Claims

1. A method of resurfacing an existing road surface or the like comprising the steps of:

(a) obtaining a measurement of actual surface profile as a function of distance over the existing road surface,

(b) identifying a desired road profile by electronically simulating characteristics of vehicle response travelling over the measured road surface profile while selectively electronically altering wavelength content of said measured profile until said characteristics of vehicle response achieve a preselected standard, and

(c) modifying the existing road surface to obtain said desired profile by propelling road resurfacing equipment over the existing road surface while continuously controlling said road resurfacing equipment as a function of a difference between said desired profile and said measured profile.

2. The method set forth in claim 1 wherein said step (a) comprises the step of obtaining an electronic measurement signal indicative of actual surface profile as a function of distance over the road surface, and

wherein said step (b) comprises the step of progressively electronically altering spatial wavelength content of said measurement signal until said characteristics of vehicle response achieve said standard.

3. The method set forth in claim 2 wherein said step (c) comprises the step of controlling said road resurfacing equipment as a conjoint function of distance over said road surface and said difference.

4. The method set forth in claim 3 wherein said step (b) of simulating characteristics of vehicle response comprises the steps of:

(b1) identifying a minimum desired ride quality standard as a function of acceleration perpendicular to the measured profile of a simulated sprung vehicle mass travelling at preselected speed over said surface, and

(b2) progressively increasingly filtering short spatial wavelengths in said measured profile until said ride quality standard is achieved.

5. The method set forth in claim 3 wherein said step (b) of simulating characteristics of vehicle ride comprises the steps of:

(b1) identifying a minimum desired dynamic load standard as a function of forces applied to the road surface by a simulated sprung vehicle mass travelling at preselected speed over said surface, and

(b2) progressively altering spatial wavelength content of said measured profile until said dynamic load standard is achieved.

6. The method set forth in claim 3 wherein said step (c) comprises the steps of:

(c1) providing road surface refinishing equipment having an equipment frame carried for travel over said road surface and means controllably suspended from said frame for selectively altering portions of said road surface, and

(c2) controlling the position of said surface altering means with respect to said vehicle frame as said conjoint function of distance over said road surface and said difference between said desired profile and said measured profile.

7. The method set forth in claim 6 wherein said means comprises means for selectively removing surface material from said road surface.

8. The method set forth in claim 6 wherein said means comprises means for selectively applying surface material to said road surface.