JPH07172214A - Tire pressure reduction alarming display device - Google Patents

Abstract

PURPOSE:To provide a tire pressure reduction alarming display device capable of monitoring a change in pneumatic tire pressure safely without deviating a driver's glaze from a front during his travelling drive. CONSTITUTION:A tire pressure reduction alarming display device is provided on the surface of a front glass 8 of a vehicle to display the information about the pneumatic the pressure of respective tires while maintaining the transparency of the front glass. It consists of a tire pressure reduction detecting mechanism A for detecting a change in the pneumatic pressure in the respective tires 6 and an alarming display control mechanism B connected to the detecting mechanism A to display the output of the information on the front glass 8. The alarming display control mechanism B is provided liquid crystal display 5 having a back light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire pressure reduction warning display device. More specifically, the present invention relates to a tire decompression alarm display device that allows a driver to immediately know the tire decompression state without lowering the line of sight on the front panel under the windshield, because the tire decompression warning display device is transparently displayed on the windshield.

[0002]

2. Description of the Related Art In recent years, various devices have been proposed for detecting changes in tire air pressure. For example, there is a method of comparing a signal of a sensor for detecting the number of rotations of a tire with a vehicle speed, detecting a decrease in the circumferential length of the tire due to a pressure reduction, and detecting a decrease in an air pressure. By such a method, the change in tire air pressure is detected independently for each tire. Then, when the detected pressure reduction exceeds a certain level and it is determined to be abnormal, the driver is notified of that. As a means for this, a sound method such as an alarm buzzer has been proposed. However, since it is difficult to know the degree of decompression with sound, there is a problem that it is not possible to determine whether the decompression is such that driving can be continued safely or whether it is better to stop immediately because it is dangerous.

Further, a method has been devised in which a change in air pressure is displayed on the front panel in front of the driver's seat like a speedometer, but the driver has to look down on the instrument on the front panel while driving. However, there is a problem that not only cannot the depressurization be surely notified, but also there is a high possibility that it becomes dangerous while driving while looking aside.

In view of the above circumstances, it is an object of the present invention to provide a tire decompression alarm display device that allows a driver to safely monitor changes in tire air pressure without turning off the line of sight from the windshield while driving. And

[0005]

A tire decompression alarm display device of the present invention is a tire decompression alarm display device for displaying information on tire pressure of each tire on a windshield surface of a vehicle while maintaining its transparency. The tire pressure reduction detection mechanism detects a change in air pressure of each tire, and an alarm display control mechanism connected to the tire pressure reduction detection mechanism and outputting and displaying the information on the windshield.

Further, it is preferable that the display control mechanism comprises a liquid crystal display with a backlight.

[0007]

In the tire decompression alarm display device of the present invention, information relating to changes in tire air pressure detected by the tire decompression detection mechanism is displayed on the windshield surface by the alarm display control mechanism while maintaining its transparency. The alarm display control mechanism is preferably configured to irradiate the windshield with a liquid crystal display light beam by a liquid crystal display with a backlight.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The tire decompression alarm display device of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a system explanatory view of a tire decompression warning display device of the present invention, and FIG. 2 is an explanatory view showing an example of a display state. As shown in FIG. 1, a tire pressure reduction alarm display device of the present invention includes a tire pressure reduction detection mechanism A including an air pressure change detection sensor 1 and an air pressure change detection device 2, a control device 3, a liquid crystal display drive device 4, and a backlight. And an alarm display control mechanism B including an attached liquid crystal display 5.

The air pressure change detection sensor 1 is attached to each tire 6. Any sensor may be used as long as it can directly or indirectly measure a change in tire air pressure. For example, a semiconductor pressure transducer, a strain gauge pressure transducer, or a piezoelectric pressure transducer. It is possible to use one that directly measures a change in air pressure using a converter or the like, or a sensor that indirectly measures a change in air pressure using a sensor that detects the number of rotations of the tire. In the case of a sensor that detects the rotation speed of a tire, the signal is received by the air pressure change detection device 2, the rotation speed of each tire is compared and examined, and the tire whose rotation speed is higher than other tires is identified. The reduced pressure can be detected by the method described above. This is because the number of rotations at the same speed increases as the tire circumferential length decreases due to the pressure reduction.

The control device 3 displays the value of the air pressure detected as described above, for example, in the bar graph shape shown in FIG.
Convert the display method so that the degree of decompression can be seen at a glance. Liquid crystal display driving device 4 according to the signal
Is driven, and the liquid crystal display 5 with a backlight irradiates the windshield 8 with the liquid crystal display light beam 7.

The liquid crystal display 5 with a backlight comprises a liquid crystal display and a backlight for irradiating the liquid crystal display with light from the back side. A transmissive display is used for the liquid crystal display, and the image displayed on the liquid crystal display is displayed on the windshield by irradiation of a backlight like a film.

The liquid crystal backlight includes an edge light system, a lighting curtain system, and the like, and it is preferable that a uniform and sufficient brightness can be obtained, and it is currently preferable to use a lighting curtain type backlight. Then, the elevation angle is set so that the image formed by the liquid crystal display light beam irradiated from below the windshield is at the same position as the height of the line of sight 9 of the driver.

Next, an embodiment of display contents will be described with reference to FIG. The bar graph shows the degree of air pressure reduction. In FIG. 2, the pressure is moderate, and the driver should drive with caution not to run at high speed. Then, the driver can be urged to make a decision to adjust the air pressure to a regular air pressure at the gas station before going out on the highway. Then, when the decompression becomes large and it is dangerous to drive at low speed, a symbol such as STOP is displayed to encourage the vehicle to stop. Information on which tire is deflated may be displayed on the windshield. Alternatively, the depressurized tire may be displayed on the warning light 10 on the front panel. It is preferable that the warning light 10 displays the position of the tire whose pressure has been reduced and the degree of the pressure reduction so that more detailed information regarding the tire pressure can be known.

Although a liquid crystal display with a backlight is used as the display means on the windshield in the above-mentioned embodiment, other than this, it is possible to use an electric display using an LED or the like.

Further, in addition to the depressurized state of the tire, other information such as vehicle speed can be displayed on the windshield.

[0016]

As described above, the tire decompression alarm display device of the present invention can monitor changes in the air pressure of the vehicle without the driver's eyes turning from the windshield while driving. Therefore, the driver who is traveling can safely know the rate of change in air pressure, and can determine whether to continue driving or stop and whether or not high-speed traveling is possible. In addition, when an imminent abnormality that requires the vehicle to stop occurs, a vehicle stop warning can be displayed. The stop alarm is immediately noticed to the driver, and it is possible to safely and promptly stop the vehicle.

[Brief description of drawings]

FIG. 1 is a system explanatory view showing an embodiment of a tire pressure reduction warning display device of the present invention.

FIG. 2 is an explanatory diagram showing an example of a display state.

[Explanation of symbols]

 A Tire pressure reduction detection mechanism B Alarm display control mechanism 5 Liquid crystal display with backlight 6 Tire 8 Windshield

Claims (2)

[Claims] 1. A tire pressure reduction alarm display device for displaying information on tire pressure of each tire on a windshield surface of a vehicle while maintaining its transparency, the tire pressure reduction detecting a change in air pressure of each tire. A tire decompression warning display device comprising a detection mechanism and an alarm display control mechanism connected to the tire decompression detection mechanism and outputting and displaying the information on the windshield. 2. The tire pressure reduction warning display device according to claim 1, wherein the warning display control mechanism includes a liquid crystal display with a backlight.