JPH04135904A - Device for informing time of tire replacement - Google Patents

Abstract

PURPOSE:To appropriately know the time of replacement of tires with the use of a device for informing the time of replacement of tires in a construction machine or the like, by inputting a condition of a runway, a load and a vehicle speed on the basis of conditions of a working site and a use condition so as to compute a remaining use life of tires or the time of use up to the present time through a predetermined computation. CONSTITUTION:When a vehicle speed, a runway coefficient D and a load factor W are delivered from a speed sensor 5, a runway factor setting input section 22 and a load factor setting input section 23, respectively, a vehicle speed factor S is computed from the detected vehicle speed. Further, with the use of a predetermined calculating expression, a remaining tire use life Lf is computed from a maximum life time Tm, the load factor W, the vehicle speed factor S, the runway factor D and sampling intervals (cumulative seconds) for a speed sensor signal. If the remaining use life becomes zero, a warning lamp 13 is turned on.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a tire replacement timing notification device, and particularly relates to a tire replacement timing notification device that predicts the lifespan of tires installed on vehicles such as construction machinery and industrial machinery, and predicts the tire replacement timing. This invention relates to improvements to a tire replacement timing reporting device that notifies drivers of tire replacement timing.

(Prior Art) Conventionally, the maximum lifespan of a tire, which indicates when to replace the tire, has come to indicate the time to replace the tire due to tire wear.

For example, it is shown as follows.

Example: 5000 hours for TRA code E-3, E-4
In the case of , the maximum life is 8,500 hours.

Here, TRA stands for American Tire and Rim Association (THETIR).
E! AND RIM ASSOCIATION IN
Abbreviation of C), E-3 is classified by TRA and is for general hard soil, and E-4 is classified by TRA and has trauma resistance and abrasion resistance of E-3 or higher.

Based on this value, tires are replaced after measuring tire wear.

(Problem to be Solved by the Invention) However, in the conventional method described above, the lifespan of tires mounted on a vehicle is generally determined by wear;
In construction machinery and industrial vehicles, the load conditions (load and speed applied to the tire) applied to tires are large, so the load heats the tire, which accumulates and reduces the material strength of the tire, causing separation and bursting, causing tire damage. The lifespan of is determined. As described above, since the load condition of the tire during the driving condition is not known, there is a problem in that it is not possible to detect failure of the tire due to burst or separation caused by a large overload for a short period of time.

The present invention focuses on the above-mentioned conventional problems and relates to a tire replacement timing notification device, and particularly relates to a tire replacement timing notification device that predicts the lifespan of tires installed on vehicles such as construction machinery and industrial machinery and notifies them of replacement timing. The purpose is to improve the timing notification device.

(Means for Solving the Problems) In order to achieve the above object, in the first invention according to the present invention, a traveling path coefficient setting input section 22 that is set according to the condition of the traveling path and a load applied to the tires are provided. A load coefficient setting input section 23 to be determined, a tire replacement input section 25 for inputting tire replacement at the time of tire replacement, a maximum life time setting input section 26 determined by the tire, and a remaining life time display section 1
1 or a usage time display section 12 that displays the usage time up to the present time, and a data processing section 21 that performs arithmetic processing using data from each sensor. In the second invention, a vibration sensor 41 that detects the condition of the driving path, a load sensor 42 that detects the load applied to the tires, a speed sensor 5 that detects the vehicle speed, and the data from each sensor are used to determine the driving path coefficient. , load coefficient, vehicle speed coefficient, and so on.
It is composed of a data processing section 21 that calculates the remaining life time of the tire using each coefficient, and a remaining life time display section 11 that displays the calculated remaining life time.

(Function) According to the above configuration, the driver can
Since tire life is predicted, sudden tire bursts are less likely, tire life can be estimated with high accuracy, and tires can be replaced regularly. By understanding the usage status of tires and accumulating data, it is possible to make recommendations based on usage status, extending the lifespan of tires and making it possible to accurately estimate the lifespan.

(Example) Hereinafter, an example of the tire replacement timing notification device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is an overall configuration diagram of an embodiment of the present invention, FIG. 2 is a tire replacement timing notification device, FIG. 3 is a block diagram, and FIG. 4 is a flowchart.

In FIG. 1, a tire replacement timing notification device 20 is installed in a driver's cab 2 of a dump truck 1 and connected to a power source 3 such as a battery. The load sensor 4 is a detector for measuring the load applied to the tire, and is attached near the tire, for example, to a suspension cylinder, and measures the pressure applied to the cylinder to calculate the load of the dump truck l. , to measure the load applied to the tire. Alternatively, the tire air pressure may be measured and the load of the dump truck l may be calculated. The speed sensor 5 is attached to the output shaft of the transmission 6, and measures the rotational speed of this output shaft to detect the rotational speed of the tires or the vehicle speed. Further, separate and independent rotational speeds of tires or vehicle speeds may be installed.

In FIGS. 2 and 3, a tire replacement timing notification device 20
, a data processing section 21 that performs arithmetic processing using a computer or the like using data from each sensor, and a traveling road coefficient setting input section 22 that is set according to the conditions of the traveling path (coefficients determined by rocks, gravel roads, etc.). Displays a load coefficient setting input section 23 that is determined by the load applied to the tire, a tire change input section 25 that inputs tire replacement when changing the tire, a maximum life time setting input section 26 that is determined by the tire, and a remaining life time that changes depending on the load situation. a remaining life time display section 11 for displaying the remaining tire life time, a usage time display section 12 for displaying the usage time up to the present time, an alarm lamp J3 that issues an alarm when the remaining tire life time has run out, a power switch 14, and a data output It is composed of a connector 30. Further, the tire replacement timing notification device 20 is connected to the power source 3, load sensor 4, and speed sensor 5 using electric wires.

In the above configuration, the operation will be explained next.

In the flowchart of FIG. 4, in step 51, each initial value data is set to zero when replacing a new tire.

Automatically done by computer. In step 52, the following data is inputted from each data, for example, the traveling road coefficient setting input section 22 and the load coefficient setting input section 23, in accordance with the work site and usage conditions.

■ Traveling road coefficient (symbol D), royal road without rocks 1. 0 Royal road with some rocks 0.9 Well maintained gravel road 0.9 Poorly maintained gravel road 0.7 Sharp rocky road 0.6 ■ Load factor (symbol W), 80% load □1.2 Standard load □1 ．． 0 20% overload 0.8 40% overload 0.5 ■Vehicle speed coefficient (symbol S), 16Km/h or less□1.0 32Km/h or less□0.8 48Km/h or less□0.6 In step 53 , the maximum life time setting input section 26 indicates the maximum life time in m before each coefficient determined by the tire is 1.
Enter more information.

In step 54, the speed of the vehicle is calculated using the speed sensor 5 to obtain a vehicle speed coefficient.

In step 55, the remaining life time Lf of the tire is determined using, for example, the following equation.

(a) When using new tires at the first site, L
f = Tm-((1/ (WxDxS))X (To
/3600)) However, To is the sampling interval of the speed sensor signal (for example, cumulative seconds at 10 second intervals). In this case, if the remaining life time becomes zero and the usage time becomes longer than the remaining life time, a negative value is displayed.

(bl If the tire was replaced due to a tire failure due to a burst, etc. before its maximum lifespan last time, L f = Tm - ((1/ (WXDxS) IX (To
/3600) ) + ((((Ta-La) /Ta) +ll X2)
However, Ta is the target tire life time, La is the remaining tire life time at the time of burst, and in this case, (((Ta-La)/Ta)+I)
The formula for X2 is the ratio of the target tire life time (Ta) to the actual life time (Ta-La) ((Ta
-La)/Ta) is used to determine the next target value as an intermediate value between the life time set as the previous target and the previous actual life time.

(C) If it was replaced last time due to normal wear, etc., Lf=T
m-(((1/ (WxDXS))x (To/360
0) ) : t (Tr/Ta)+I)X2) However, Tr:
Tire life extension time from when the tire life time reaches zero to when the tire is actually replaced.In this case, ((Tr/Ta)+II X2 is the life span with the next target value as the previous target This is a formula for finding the intermediate value between time and the previous actual life time.Step 5
6 displays the remaining life time of the tire and the usage time up to now. In step 57, it is determined whether the usage time up to now has reached the life span of the tire. (Determine whether the remaining life time of the tire has become zero.) In step 58, the warning lamp 13 lights up from the time the remaining life time becomes zero, and the tire change input section 25, which inputs a tire change at the time of tire change, is activated. lights up until activated. In step 59, when changing a tire, the tire changing input section 25 is operated to activate the tire changing input section 25. The switch of the tire change input section 25 is a switch that is pressed when the vehicle starts driving for the first time after the tire change, and the calculation of the tire life time is started anew. Additionally, this switch is designed to be locked by inadvertent software. The power switch 14 is a power switch for the tire replacement timing notification device 20 and also has a function of resetting the data processing section 21.

FIG. 5 shows a second embodiment of the invention. Components that are the same as those in the first embodiment are given the same reference numerals, and explanations thereof will be omitted. A vibration sensor 41 is used in place of the traveling path setting input section of the first embodiment, and a load sensor 42 is used in place of the load setting input section, and the data processing section 21 calculates the signals from these sensors. Then, the road coefficient and load coefficient are calculated. Using these coefficients and the vehicle speed coefficient from the speed sensor in the same manner as above, the remaining life time of the tire is calculated using the above formula. At this time, signals from the vibration sensor 41, load sensor 42, speed sensor 5, traveling road coefficient, load coefficient,
The relationship with the vehicle speed coefficient is stored in a storage section of the controller (not shown). The data output connector 30 is for outputting data stored in the data processing unit 21, and is connected to a microcomputer (not shown) for data processing to output data until the tire is replaced (see Fig. 6). (see). This makes it possible to make recommendations on how to use the vehicle in the future (for example, if the vehicle speed is faster than the standard and the lifespan of the tires is short, reduce the speed, etc.) and extend the lifespan of the tires. In this way, by setting the next target value using actual life time data, the accuracy of the life time can be improved.

(Effects of the Invention) As explained above, according to the present invention, since the life of the tire is predicted based on the load condition of the tire, the life of the tire can be estimated with high accuracy, and the tire suddenly bursts. This reduces the number of problems and allows you to change tires regularly. In addition, as we understand the usage status of tires and accumulate data, we can make recommendations based on usage status, extend the life of tires, and use actual life time data to set the next target value. By setting , an excellent effect can be obtained in that the accuracy of the life time can be increased.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of one embodiment of the present invention. FIG. 2 is a schematic overall view of the tire replacement time notification device according to the embodiment (1) of the present invention, FIG. 3 is a block diagram of the tire replacement time notification device of the present invention, and FIG. 4 is a tire replacement time notification device of the present invention. FIG. 15 is a schematic overall diagram of a tire replacement timing notification device according to a second embodiment of the present invention; FIG. 6 is a diagram showing an example of output data of the present invention; 1. . . . 4.・ ・ 5 ・ ・ 11 ・ ・ l 2 ・ ・ 13 ・ ・ ] 4 ・ ・ 20 ・ ・ 2 l ・ ・ 22 ・ ・ 23 ・ ・ 25 ・ ・ 26 ・ ・ 4 l ・ ・ 42 ・ ・ Dump truck, load Sensor, speed sensor, ・Remaining life time display section, ・Usage time display section, ・Warning lamp, ・Power switch, ・Tire replacement time notification device/data processing section, ・Travel road coefficient setting input section, ・Load coefficient setting input・Tire replacement input section, ・Maximum life time setting input section, ・Vibration sensor, ・Load sensor,

Claims (2)

[Claims] (1) A driving road coefficient setting input section 22 that is set according to the condition of the driving path, a load coefficient setting input section 23 that is determined according to the load applied to the tire, a tire exchange input section 25 that inputs tire replacement at the time of tire replacement, Maximum life time setting input section 26 determined by , and remaining life time display section 11
Alternatively, a tire replacement time notification device comprising a usage time display section 12 that displays the usage time up to the present time, and a data processing section 21 that performs arithmetic processing using data from each sensor. (2) A vibration sensor 41 that detects the condition of the driving path, a load sensor 42 that detects the load applied to the tires, a speed sensor 5 that detects the vehicle speed, and a driving path coefficient and load coefficient using data from each sensor. , vehicle speed coefficient, and calculates the remaining life time of the tire using each coefficient, and the remaining life time display part 11 that displays the calculated remaining life time. Tire replacement time notification device.