Method and system for detecting potential icy conditions on roads

• US 5,416,476 A
• Filed: 11/29/1991
• Issued: 05/16/1995
• Est. Priority Date: 11/29/1991
• Status: Expired due to Term

• Current Assignee: Vaisala Oyj
• Original Assignee: Edward Rendon
• Inventors: Rendon, Edward
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): Lefkowitz, Edward
• Application Number:
  US07/800,204
• Time in Patent Office: 1,264 Days
• Field of Search: 340/901, 340/904, 340/905, 340/580, 340/581, 340/583, 340/584
• US Class Current: 340/905
• CPC Class Codes: B60R 16/0237 circuits concerning the atmospheric environment meteorology G01W
• CPC Class Codes: G01J 3/443 Emission spectrometry
• CPC Class Codes: G01V 8/10 Detecting, e.g. by using light barriers by reflection from the object G01S17/00

Abstract

A warning system for vehicles detects actual road surface temperature and advises the driver of surface temperatures which indicate the vehicle may be approaching possible ice formation on roadways. The warning system comprises an infrared detector mounted externally on the vehicle and aimed at the road surface, the detector arranged to read only the infrared temperature wavelength emissions associated with concrete and asphalt to eliminate confusing and erroneous readings inadvertently received through infrared emission from other objects in the vicinity. The detector is connected to a processing unit which translates the electric signals from the detector into a temperature readout display for the driver and the processing unit may include an alarm which is activated to attract the driver'"'"'s attention when road temperatures are detected that are below a set minimum temperature that is selected by the driver'"'"'s manual adjustment of a temperature select control knob on the unit.

Claims

1. A warning system for detecting potentially icy road surface conditions from vehicles, the warning system comprising:

a) an infrared detector configured for mounting on a vehicle to detect infrared temperature radiation emitted by conventional road surface and to produce electric signals representing detected temperatures, and

b) a processing unit mounted in the vehicle and including electric temperature indicating means connected to said infrared detector to receive the electric signals from the infrared detector to inform an operator of the vehicle of road temperatures that indicate potential icing conditions.

2. The warning system of claim 1 wherein the processing unit temperature indicating means includes an audible or visual alarm when the road surface temperature detected falls below a predetermined temperature minimum.

3. The warning system of claim 1 wherein the processing unit temperature indicating means includes a numerical display of degrees of temperature detected from a road surface, and an audible or visual alarm which is triggered when the detected road surface temperature falls below a predetermined temperature minimum.

4. The warning system of claim 1 wherein the infrared detector includes a casing and a lens at the forward end of the casing, and a detector lens-protecting hollow, open-ended tube is detachably secured to the forward end of the casing and is configured to surround the lens of the detector and extend outwardly therefrom a distance sufficient to protect the lens from exposure to dust, dirt, road spray and other deleterious elements associated with the driving environment.

5. The warning system of claim 1 wherein the infrared detector mounts a lens arrangement configured to focus accurately from a distance equivalent to that required for temperature readings to be taken of a runway road surface from an airplane on a landing approach, whereby a pilot may be apprised of potential freezing surface conditions in advance of a commitment to land.

6. A method of detecting potentially icy road conditions from a moving vehicle comprising detecting the infrared temperature radiation emitted from a road surface and signaling an operator when the detected road surface temperature approaches the temperature at which water freezes or ice melts.