JPS59188545A - Warning device of freezing on road surface - Google Patents

Abstract

PURPOSE:To generate the warning of freezing accurately by providing an infrared-ray detecting means which detects infrared rays from the road surface right under a vehicle and generates an infrared-ray signal, and a means which receives the signal from the detecting means and judges the freezing state of the road surface. CONSTITUTION:The infrared-ray sensor 1 is provided to the lower part of the vehicle and detects infrared rays from the road surface right under the vehicle. Further, an outside air temperature sensor 2 detects the temperature of the air outside of the vehicle. An A/D converter 3 converts the detection signals from the infrared-ray sensor 1 and outside air temperature sensor 2 into digital signals. When the outside air temperature is lower than 10 deg.C, infrared-ray data is inputted in a step 103 from the infrared-ray sensor 1 through the A/D converter 3, and a decision whether the road surface is at the freezing temperature or not is made in a step 104. Consequently, the road temperature is detected accurately under less influence of the sunshine.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a road surface freezing warning device that detects a frozen state of a road surface and issues a warning.

(1) Previously, the only information regarding frozen roads was the warning signs installed in areas where frozen roads are likely to occur, such as mountainous areas, and it was up to the driver to determine whether or not the roads were actually frozen. It was left up to the person himself. For this reason, the driver cannot obtain reliable information about the frozen road surface while driving the vehicle, and therefore, even though the road surface is frozen,
There were many cases of reckless driving.

The present invention has been made in view of the above problems, and an object thereof is to provide a road surface freezing warning device that directly detects the frozen state of the road surface and issues a warning.

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 is a block diagram showing one embodiment thereof.

In FIG. 1, an infrared sensor 1 is provided at the bottom of the vehicle as shown in FIG. 2, and detects infrared rays (dotted line in FIG. 2) from the road surface directly below the vehicle. 2 is an outside temperature sensor that detects the temperature of the air outside the vehicle.

3 is an A/D converter, infrared sensor 1, outside temperature sensor 2
This is to convert the detection signal (2) from the sensor into a digital signal.

4 is a microcomputer that executes digital arithmetic processing by software according to a predetermined program, and when connected to the crystal resonator 5, it receives stabilized power from the on-board battery via the stabilized power supply circuit, and becomes operational; It executes the calculation process of the road surface freezing warning shown in FIG.

Reference numeral 6 denotes a display device, on the front of which are written the words "Beware of frozen road surface", and upon receiving a display lighting command from the microcomputer 4, the words "Beware of frozen road surface" are displayed.

The operation of the above configuration will be explained. Now, in a vehicle equipped with each of the components 1 to 6 shown in FIG. 1, when the vehicle key is inserted while the vehicle is being driven, power is supplied from the on-vehicle battery to each part of the electrical system, and each part of the electrical system becomes operational. The microcomputer 4 also receives stabilized power from the on-vehicle battery via the stabilized power supply circuit, becomes operational, and executes the arithmetic processing shown in FIG. 3.

(3) In the arithmetic processing shown in FIG. 3, in step 101, outside temperature data is inputted from the outside temperature sensor 2 via the A/D converter 3, and the process proceeds to step 102, in which the outside temperature data is input based on the first temperature data. It is determined whether the temperature is below 10°C. If the outside temperature is higher than 10° C., it is assumed that the possibility of road surface freezing is extremely low, and the road surface freezing determination process from step 103 onwards is not performed. However, if the outside temperature is below 10°C, the infrared sensor 1 detects the
Infrared data is input via the /D converter 3, and the process proceeds to step 104, where it is determined based on the infrared data whether the road surface is below a predetermined temperature for freezing. When it is determined that the road surface is frozen, the process proceeds to step 105, where a display lighting command is held and generated in the display 6, and the words "Road surface freezing warning" are lit and displayed. However, step 10
If it is determined in step 4 that the road surface is not frozen, the process proceeds to step 106 and the generation of the display lighting command to the display 6 is canceled. Therefore, by repeating the above process, if the road surface is frozen, the words "Road surface freezing warning" will be lit up on the display (4) 6, and if the road surface is not frozen, the display will be turned off. let

In the above embodiment, the outside air temperature is used to determine whether or not to perform the road surface freezing determination process. Alternatively, a determination may be made as to whether or not this is the case.

Furthermore, although the case where the road surface freezing warning is given by text display has been shown, the warning may be given by emitting a voice saying 'Beware of road surface freezing'.

As described above, in the present invention, accurate road surface freezing warning can be given by detecting road surface temperature using infrared rays, and since infrared rays are detected from the road surface directly below the vehicle,
This has the excellent effect of being able to accurately detect road surface temperature with little influence from sunlight.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the mounting state of the infrared sensor in Fig. 1 (5), and Fig. 3 is a microcomputer shown in Fig. 1. 2 is a calculation flowchart showing calculation processing of FIG. 1...Infrared sensor, 2...Outside temperature sensor, 4...
・Microcomputer, 6...display unit. Representative Patent Attorney Takashi Okabe (6) Figure 3, page 1 continued 0 Inventor Shunji Okumura Nippondenso Co., Ltd., 1-1 Showa-cho, Kariya City 0 Inventor Yoshito Nakano 1-1 Showa-cho, Kariya City Address Nippondenso Co., Ltd.

Claims (1)

[Scope of claims] A road surface freezing warning device comprising a judgment means for judging the state, and a warning means for issuing a road surface freezing warning when the judgment means judges the frozen state of the road surface. A road surface freezing warning device according to claim 1, which performs a judgment operation when the temperature is below the temperature. The road surface freezing warning device described in item 1.