DE2223549A1 - METHOD OF MEASURING THE SURFACE STRUCTURE OF ROADS - Google Patents

Description

Method for measuring the surface structure of roads.

The invention is concerned with a method with which the surface structure can measure from streets.

The condition of the road surface, especially the smoothness of the road is not only of interest to road technicians.

The road watch can do this with the appropriate knowledge of the road conditions If necessary, promptly point out the risk of an accident. Knowledge of this parameter would be of particular use to every driver. The road conditions can are known to change very quickly. This is the case in damp weather and especially at temperatures around freezing point. From a dry non-slip area The road surface then suddenly becomes a mirror-smooth road - normal braking of the vehicle is then very difficult or even impossible. You could go through Frequent braking try to get an idea of the road conditions, but this is too cumbersome and would be too late at the crucial moment.

The invention has therefore set itself the task of remedying this create.

Based on the method mentioned at the beginning, according to the invention suggested that a vehicle passing through the road with a non-powered, additional Measuring wheel is provided, which rests well on the road and that the speed of the measuring wheel, preferably periodically, braked to a predetermined value and that the power required for this is displayed.

The invention is based on the knowledge that between the braking force and the smoothness of the road is directly related. Vehicle condition, tires and load are assumed to be normal.

When the road is dry and grippy, you become a very specific one Require force to brake the measuring wheel to a certain speed value. This value can be zero, for example. The surface of the road is smooth or even wet, the braking force will have a different value Tests can somLi determine the appropriate braking force for every road condition.

With the help of these measured values one can then the road conditions arbitrarily Measure roads at any time.

For this purpose, the measuring wheel is set at any time during the journey An electric motor is particularly suitable for this. The required braking force is then displayed optically. The scale is expediently calibrated in such a way that one indicates whether normal or careful braking is required. Another area the scale indicates that the road is so smooth that braking is much more possible This area of the scale should be particularly noticeable in order to warn the driver. The individual areas are advantageously laid out in different colors.

In a further development of the invention, when broadening the area, the when braking means danger, this also means acoustically and / or a flashing light indicated, one can easily find a suitable arrangement for carrying out the process Retrofit it in a vehicle. Depending on the requirements, the measuring wheel will be used attach to a suitable place on the underside of the vehicle.

In order to prevent unnecessary wear and tear, the measuring wheel is articulated in such a way that that it can be locked in a position in which there is no contact with the Has bottom. This is expediently carried out in such a way that the measuring wheel is removed from the Inside the vehicle can operate.

The scale is attached to the dashboard so that you can read the readings can be easily drained during the journey.

It is advisable to take the measurement at periodic intervals. It is particularly advantageous if one enables a continuous display For this purpose, braking must take place at correspondingly short time intervals. In connection The time intervals can be selected to be longer with a slow display instrument.

In a further embodiment of the invention, the scale can also be used Calibrate in such a way that the braking distance that the vehicle is traveling back is displayed at the same time lays until it comes to a standstill under the prevailing road conditions.

The method according to the invention thus enables a quick and simple one Determination of the road condition, which increases road safety.

Claims (7)

Claims Method for measuring the surface structure of roads, thereby marked that a vehicle passing the road with a non-powered, additional measuring wheel is provided, which rests well on the road and that the speed of the measuring wheel, preferably periodically, to a predetermined one Value is braked and the force required for this is displayed. 2. The method according to claim 1, characterized in that the braking is made by an electric motor and that the required braking force is displayed visually. 3. The method according to claim 2, characterized in that the scale indicates the respective braking distance of the vehicle until it comes to a complete standstill. 4.Verfahren according to claim 2 or 3, characterized in that the The scale is divided into different colored areas, which indicate whether normal, can be braked carefully or not at all. 5. The method according to claim 4, characterized in that the area in which should not be braked, additionally acoustically and / or by a flashing light is shown. 6.Verfahren according to any one of the preceding claims, characterized in that braking, possibly in connection with a correspondingly sluggish display such time intervals are made that one can obtain a measured value that is as long as possible as a parameter of the road conditions. 7. Arrangement for the implementation of the procedure, marked by that the essrad is articulated on the underside of the vehicle so that it is in a die Road non-touching position can be locked.