JPH0237109Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The invention automatically measures the road surface temperature on the road.
For vehicles (motorcycles) that detects humidity and road slope, notifies drivers of the possibility of road surface freezing, responds immediately to on-site conditions, and prompts drivers to avoid accidents by displaying warnings of freezing. including)
The present invention relates to a road surface information display device.

(Prior Art) As a method for detecting the frozen state of the road surface while the vehicle is running, which has been generally considered difficult, there is a method for detecting the frozen state of the road surface, for example, as disclosed in Japanese Patent Application Laid-Open No. 58-80014. A method has been proposed to identify whether the road surface is dry or wet by projecting light such as visible light or near-infrared light and detecting the amount of light reflected from the road surface. However, regarding the frozen state, it is only possible to estimate the possibility of freezing by mainly detecting the degree of dryness and wetness of the road. This is especially true when the road shape is complex or when the occurrence of freezing is localized. In such cases, it may be difficult for drivers to make accurate judgments regarding conditions such as icy road surfaces, and there is also the risk that prompt action at the scene of the icy situation may be delayed.

In addition, there are devices that detect weather conditions such as temperature, humidity, and atmospheric pressure and automatically scan display them, such as the one disclosed in Japanese Patent Application Laid-open No. 59-162475, but this does not inform the driver of the weather conditions. It is possible to predict road surface freezing using this device, but in this case, it is left up to the individual driver's judgment based on weather conditions such as temperature and humidity, and there is a risk that accurate judgment cannot be made. At the same time, it is less effective in alerting drivers, and there is a risk that frozen areas may be overlooked. Furthermore, weather conditions such as temperature, humidity, and atmospheric pressure are affected by wind and other factors, making it difficult to accurately determine whether the road surface is frozen.

On the other hand, as a background to the emphasis placed on the field of technology that deals with frozen roads, one must not overlook the various causes of traffic accidents that have been increasing again in recent years: It has been pointed out that the number of serious accidents occurring is increasing. Moreover, conventional safety facilities related to frozen roads include installation of roadside devices or signs at required locations by road administrators to monitor, caution, and warn of frozen conditions in mountain areas, bridges, etc. teeth,
There was almost nothing to see.

(Problems that the invention attempts to solve) The actual situation of traffic accidents caused by frozen road surfaces is as follows.
Even on ordinary roads, slip accidents due to ice are very common due to road conditions such as uphill or downhill slopes, and they often occur unexpectedly in unexpected places. Therefore, as a way to carefully prevent this, the present invention is not a facility on the road, but a device that allows drivers to predict frozen roads in advance, regardless of the day or night, and warns them of the need for freezing depending on the situation. The aim is to provide a system that can be installed in vehicles to prevent slip accidents.

(Means for solving the problem) This invention, as a means to solve the problem, simultaneously detects road surface temperature, outside air humidity, and road slope, and uses these values together to determine the possibility and degree of road surface freezing. It was successfully captured. That is, in the present invention, a vehicle is equipped with a sensor unit consisting of a non-contact surface temperature sensor that detects road surface temperature, a humidity sensor that detects outside air humidity, and a slope measuring device that measures road slope. is read by a central control device, the road slope is digitally displayed on a display device, and the road surface temperature is displayed with an indicator light.Furthermore, the central control device, which stores preset freezing conditions, processes the judgment and warns of freezing conditions. This is indicated by a caution indicator light.

(Function) The present invention is capable of sensing the road surface temperature level and road slope condition at the driving point through visual transmission using the above-mentioned device installed in the vehicle, and also detects the state of road surface freezing in stages. This is to prompt the driver to take immediate action.

(Example) Next, an example of the present invention will be described and specifically explained.

FIG. 1 is a block diagram showing the main configuration of the present invention, in which the sensor section 1 is arranged in the longitudinal direction of the vehicle for measuring the road gradient.
A gradient measuring device 2 has a weight attached to two tension rods whose resistance value changes depending on the tension, a pyroelectric infrared sensor for detecting road surface temperature, a chopper with rotating blades, and a server for measuring the temperature of the chopper. A non-contact surface temperature sensor 3 consisting of a mister, and a humidity sensor 4 consisting of a resistance rod whose resistance value changes as it expands and contracts to a moisture-sensitive material such as hair or polymer ribbon that expands and contracts depending on the humidity for detecting outside air humidity. , and are centrally connected to the analog multiplexer 6. The central control device 5
a memory section 11 consisting of a ROM 12 and a RAM 13;
It consists of a central information processing unit c, p, u, 10, an A/D converter 7, an analog input selection circuit 8, a control bus line 9, and a display interface 14, and the central information processing unit 10 reads data from the ROM 12. , sends a signal to the analog input selection circuit 8 in order to store all the data of each sensor 3, 4 and slope measuring device 2 in the RAM 13,
The analog multiplexer 6 controlled thereby sequentially sends data to the A/D converter 7, and all data is stored in the RAM 13 as digital quantities. Next, the central information processing unit 10 calculates and compares the data stored in the RAM 13, and the data is converted into a signal by the display interface 14 to output display data.

FIG. 2 shows the display device 15 of the present invention, which includes a yellow indicator light 16 and a red indicator light 17 consisting of LEDs, etc., which display the road surface temperature based on the output of the central control device 5, and a digital display of the measured value of the gradient measuring device 2 in %. When the road gradient display unit 19, gradient measuring device 2, and each sensor 3, 4 exceed a preset freezing condition value, a freezing warning is displayed in stages that lights up or flashes in yellow or red. It consists of a caution indicator light 18.

Next, FIG. 3 is a flowchart showing the control function by the computer in this embodiment, and the processing and display conditions will be specifically explained below.

〔process〕

A. When the power is turned on, the central control device 5 initializes various pointers and tables so that it can input each data and perform arithmetic processing.

b) Clear the necessary data in the RAM 13 so that the data of each sensor 3, 4 and gradient measuring device 2 can be read.

C Select the sensor to be read in the next step.

D. Analog data from each sensor 3, 4 and gradient measuring device 2 that has passed through the analog multiplexer 6 is converted into digital data by the A/D converter 7, and the data is read into the RAM 13.

E Memory section 1 that stores each data
Check whether data has been entered into 1. If all data is entered, proceed to the next process; if not, return to process "U".

F. The central information processing unit 10 calculates the road slope k by calculating the data from the slope measuring device 2.

G. The road gradient k is digitally displayed in percentage on the road gradient display section 19 of the display device 15.

H) The central information processing unit 10 calculates the outside air humidity h by calculating the data from the humidity sensor 4.

(k) The central information processing unit 10 calculates the data from the non-contact surface temperature sensor 3, and calculates the road surface temperature t.
Calculate.

At this time, if the road surface temperature is 5℃ or higher, the process returns to process "A". Therefore, only the road slope is digitally displayed on the display device 15.

[Display conditions]

Next, the lighting conditions for the road surface temperature indicator lights 16 and 17 and the lighting and blinking conditions for the freeze warning indicator light 18 will be explained. The following condition rankings indicate the stages of increasing the degree of caution required for temperature and freezing, respectively.

(a) The road surface temperature yellow indicator light 16 lights up when the road surface temperature is less than 5 degrees Celsius to more than 1 degree Celsius.

(b) The condition that the road surface temperature red indicator light 17 lights up is when the road surface temperature is less than 1°C.

(c) The condition for the freeze warning indicator light 18 to light up in yellow is when all of the following three items are met.

Road surface temperature is less than 5℃ to 1℃ or more The relationship between outside air temperature and road surface temperature is 100-5t<h (t: road surface temperature, h: humidity) ○Note: There is a close relationship between outside temperature and humidity, and the relationship is 100-5T-H=0 (T: outside temperature, H: humidity)
"About freezing prediction at National Route 17 Mikuni Pass" in the document "14th Japan Road Conference Proceedings" (Japan Road Association, p. 298) that shows that
The criteria for determining whether a road surface is frozen was quoted from the results of the road surface freezing prediction survey.

When the road slope is greater than -5% (when the slope is small) (d) The conditions for the freeze warning indicator light 18 to flash yellow are when the following items are met.

If the road slope is less than -5% under the conditions of display condition c and (if the slope is large) (e) The freeze warning indicator light 18 lights up in red when all of the following two items are met.

When the road surface temperature is less than 5℃ to 1℃ or more and the road surface temperature and outside air humidity conditions are 100-5t>h, or when the road surface temperature is less than 1℃. When the road slope is greater than -5% (when the slope is small) ) (f) The conditions for the freeze warning indicator light 18 to flash in red are when the following items are met.

If the road slope is less than -5% under display condition (e) (if the slope is large), this display method can be displayed in various ways by changing the computer control program. The examples are not limited.

(Effects of the invention) Since this invention is a device that can predict the possibility of road surface freezing while the vehicle is running, it can significantly alleviate the conventional instability in terms of safe driving of vehicles and prevention of slip accidents in cold seasons. It greatly contributes to traffic safety. Furthermore, by measuring and displaying the road slope, it is possible to understand the road configuration, which has secondary effects such as being useful for speed adjustment and other purposes.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the configuration of the present invention, Figure 2 is a front view of the display device of the present invention, and Figure 3 is a front view of the display device of the present invention.
The figure is a flowchart showing computer functions.

Claims (1)

[Scope of utility model registration request] Consisting of a non-contact surface temperature sensor that detects road surface temperature, a humidity sensor that detects outside air humidity, a slope measuring device that measures road slope, a central control device for each of the sensors and slope measuring devices, and a display device, outputs from each of the sensors and the slope measuring device are digitally displayed on the display device through the central control device, and the display device visually displays the road surface temperature step by step; A road surface information display device for a vehicle, characterized in that when a preset freezing condition value is exceeded, a freezing warning is displayed step by step by visual means.