JPS6287816A - Apparatus for displaying tire pressure related information - Google Patents

Abstract

PURPOSE:To enable operation more adequately coping with a puncture, by display a runnable distance by a punctured tire when the puncture is being generated. CONSTITUTION:The presence of a puncture is judged on the basis of the tire pressure data from a tire pressure detector 20 by a computer 20 and each tire pressure and the generation of the puncture are displayed on CRT 40. The number of pulse signals at every definite running distance of a distance sensor 10 are counted by the computer 30 to determine a running distance and a speed is determined from the measurement of the output frequency or cycle of the sensor 10. The relation of a runnable distance to a running speed from the point of time of the puncture is preset to the computer 30 on the basis of the performance and characteristics of the tire. On the basis of said relation, the runnable distance corresponding to each speed at the present point of time is calculated and displayed and successively renewed at every definite time. By this method, information for adequately coping with the generation of the puncture can be provided to a driver.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a tire pressure-related information display device for a vehicle equipped with tires that can be driven for a while even if they are punctured.

[Technical f of invention! Traditionally, tire pressure detection devices have been developed that attach a tire pressure sensor to each tire of a vehicle, detect the tire pressure regardless of whether the vehicle is running or stopped, and wirelessly transmit the detection signal to a receiver on the vehicle body. known (for example, Utility Model Application No. 59-7253)
No. 0).

On the vehicle body side, the tire pressure detection signal is received and each tire pressure is displayed on the display. Additionally, the system determines whether there is a puncture based on the detected tire pressure, and displays a message to that effect if a puncture occurs.

In this way, by displaying each tire pressure and notifying the driver of the occurrence of a bank, it is possible to provide the driver with useful information that will help him drive safely.

[Objective of the Invention] The object of the present invention is to further develop the tire pressure and puncture occurrence display device described above, and to provide a display device with a high degree of processing that is more beneficial to the driver, based on tire pressure, puncture information, tire performance, etc. An object of the present invention is to provide a tire pressure related information display device that displays information. Specifically, the tires installed on modern cars can continue to be driven for a while even if they are punctured (referred to as "ranfukutsu 1~tire"). An object of the present invention is to provide a tire pressure-related information display device that enables driving that more appropriately deals with punctures by displaying the information.

[Summary of the Invention] A tire pressure related information display device according to the present invention includes a means for detecting the traveling speed of a vehicle, a means for detecting a traveling distance of the vehicle, a means for detecting each tire pressure of the vehicle, and a means for detecting the traveling speed of the vehicle. means for displaying each tire pressure; means for determining the presence or absence of a puncture from each detected tire pressure; The tire is equipped with means for sequentially calculating the possible travel distance with a flat tire as a function of the travel speed from characteristic data, travel distance after the occurrence of a puncture, travel speed, etc., and means for displaying the calculated possible travel distance. The relationship between these constituent elements is illustrated in Figure 1.

[Embodiment of the Invention] FIG. 2 is a block diagram showing the configuration of an apparatus according to an embodiment of the invention. In FIG. 2, the distance sensor 10 is a device that generates a pulse signal every time the vehicle travels a certain distance,
The distance traveled is determined by counting the number of pulses from the distance sensor 10 using the computer 30, and the speed of the vehicle is determined by measuring the output frequency or period of the distance sensor 10.

The tire pressure detection device 20 includes a tire pressure sensor attached to each tire, a transmitter/receiver that wirelessly transmits the detection signal of each tire pressure sensor from an antenna on the tire to an antenna on the vehicle body, and a transmitter/receiver that transmits the signal received on the vehicle body. and a circuit for processing and converting the tire pressure signal into a tire pressure signal expressed as a digital signal in a predetermined format.

The computer 30 includes an input/output boat 31 that receives the outputs of the distance sensor 10 and the tire pressure detection device 20, and a CP
It includes a U32, a ROM33, a RAM34, and a CRT controller 35.

The CRT 40 is installed in the vehicle interior facing the driver, and receives signals from the CRT controller 35 to display tire pressure related information as will be described later.

3(A) and 3(B) are flowcharts of the arithmetic processing executed by the computer 30, and FIG.
>(B) is the 2 displayed on the CRT 42 by this process.
Two display examples are shown.

The operation of this device will be described in detail below with reference to these figures.

FIG. 3 (△) shows the main routine of the computer 30 program.
The process advances to step 01, where initial processing necessary to execute the following steps is performed.

In step 202, tire pressure data for each tire is fetched from the tire pressure detection device 20. Next step 203
Then, based on the acquired tire pressure data, it is determined whether there is a puncture or not. If no puncture has occurred, the process proceeds to step 204, where each tire pressure is displayed on the CRT 40, and the process returns to step 202. If a puncture occurs,
Proceed to step 205 and CR each tire pressure in the same way as above.
40. Next, proceed to step 206 and display the CR
A display is displayed on the T40 to notify that a puncture has occurred, and further,
In step 207, the possible travel distance is displayed, which will be described in detail later, and the process returns to step 202.

In the two display examples shown in FIG. 4 (A>(B)), the image 500 is an identification mark indicating the tire pressure related information display mode.The image 501 is a symbol display indicating the four tires of the vehicle. The number displayed next to each tire is the tire pressure displayed by the process in step 204 or step 205.In addition, in this display example, among the four tires, the tire shown with diagonal lines (this In this case, the front right side) is an image state that indicates the occurrence of a bank (according to the process of step 206), and specifically, the image of this flat tire is displayed blinking in red.The display area indicated by 502 in FIG. 60 in (B)
The display portion indicated by 2 is the display of the travelable distance made by the process of step 207, and this will be described in detail below.

In parallel with the above main routine, the computer 30 calculates the traveling speed and distance of the vehicle based on the output of the distance sensor 10. Another tie at regular intervals? Due to the interrupt, the interrupt process shown in FIG. 3(B) is executed. In the timer interrupt processing, the presence or absence of a bank is checked in step 401, and if a bank has not occurred, the process immediately returns to the main routine. If a bank has occurred, steps 403 to 406 are executed and the process returns to the main routine.

Steps 403 to 406 are processes for sequentially calculating the possible travel distance with a flat tire as a function of travel speed from tire characteristic data, travel distance after bank occurrence, travel speed, etc. The possible distance is displayed on the CR page 47 in step 207 of the main routine.

First, in step 403, the average traveling speed VAV after the occurrence of the bank is calculated. In the next step 404, the actual distance traveled since the occurrence of the bank is calculated.

Incidentally, in view of the performance and characteristics of the tire, the following relationship is given in advance and set in the ambicoater 30. In other words, if you travel at a speed V from the banking point, the distance flf (
The relationship is such that only Vn can run, and the following equation (1
) is set in advance (a.

b and c are constants).

f(V)=aV2+bV+c ・−・−・−−−
−−(+) Therefore, if you are traveling at the average speed △■ from the time of banking, the distance you can travel at the time of banking is f(
VAv), so the relationship is that the other distance has already been traveled.

In step 405, the drivable distance f(
Calculate the ratio x of VAV) and the actual distance traveled after the puncture.

X = L/, 7' (VAV) ・・・・・・
・・・・・・・・・・・・(2) Next step 406
Then, the current drivable distance La (V) can be calculated using the following formula (
3) Set the course according to the distance that can be traveled at the time of banking,
(Note the difference from the current drivable distance). La (
Vn is the distance that can be traveled if the vehicle travels at speed V from the current moment.

La (V) = f (V) X (1-x) --
−−−−−・−<3) If, for example, 40.60.80 is substituted for the speed ■ in the above formula (3), the speed 4 from the current moment
The distances that can be traveled when traveling at 0.60 and 80 km/h are respectively determined. This is displayed in display 502 in FIG. 4(A). In contrast, Fig. 4 (B)
A display 602 is a graph displaying the function of equation (3), and the displayed circle is the current speed.

The above steps 403 to 406 are repeatedly executed at regular intervals, and the display of the travelable distance is updated one after another.

[Effects of the Invention] As explained in detail above, the tire pressure related information display device according to the present invention is configured to display the travelable distance corresponding to the vehicle speed when the tire is banked. Also, the distance to the destination or the distance to the tire replacement location can be selected to select the driving speed and travel route, which eliminates the need to change tires on the way and allows you to drive with consideration to the replacement location. , it is possible to provide extremely useful information to the driver in order to appropriately deal with the occurrence of a flat tire.

[Brief explanation of drawings]

FIG. 1 is a block diagram illustrating each component described in the claims, FIG. 2 is a block diagram of a device according to an embodiment of the invention, and FIGS. A flowchart of the arithmetic processing executed by 30,
FIGS. 4A and 4B are diagrams showing two display examples of tire pressure related information, respectively. 10...Distance sensor 20...Tire pressure detection device 30...Computer 40...CRT Fig. 3 (B
)

Claims (1)

[Claims] (1) Means for detecting the traveling speed of the vehicle, means for detecting the distance traveled by the vehicle, means for detecting each tire pressure of the vehicle, means for displaying each detected tire pressure, and each detected tire pressure a means for determining whether or not there is a puncture; a means for displaying a message to that effect when it is determined that a puncture has occurred; means for sequentially calculating the travelable distance as a function of travel speed;
A tire pressure related information display device comprising: means for displaying a calculated travelable distance.