DE102017101727B4 - A method of determining a time period in a tire change of a vehicle, system, computer program and computer program product - Google Patents

Abstract

A method for determining a time period in a tire change of a vehicle with an automatic screwdriver and a measuring device, in which
a measurement signal (M) of the measuring device is detected, which is representative of a power provided by the screwdriver,
- Depending on the measurement signal (M) a tire change start time and a tire change end time are determined, the screwdriver is designed compressed air and the measurement signal (M) is representative of a pressure curve during operation of the screwdriver.

Description

The invention relates to a method for determining a time period in a tire change of a vehicle and a corresponding system, computer program and computer program product.

The DE 20 2011 110 326 U1 discloses a system for mounting vehicle wheels in which an electronic control device is provided to which an output signal of a torque meter is supplied and generates a control signal for closing a shut-off valve and / or an optical and / or acoustic display device activated when the measured torque exceeds a predetermined value ,

The DE 689 25 507 T2 discloses a tightening torque control device for wrenches. The DE 10 2008 019 765 A1 discloses a method for controlling a hydraulically powered power wrench. The DE 10 2015 211 119 A1 discloses a method of controlling an electric motor of a power tool. The US 2016/0167206 A1 discloses a screw lock control method with an electric screwdriver. The DE 197 28 909 A1 discloses a method of making threaded connections.

The object underlying the invention is to provide a method for determining a time period in a tire change of a vehicle as well as a corresponding system, computer program and computer program product, which enables a simple, automated evaluation in a tire change. In particular, a simple, automated evaluation at a tire change in a pit stop should be possible.

The object is solved by the independent claims. Advantageous embodiments are characterized in the subclaims.

According to a first aspect, the invention relates to a method for determining a time period in a tire change of a vehicle with an automatic screwdriver and a measuring device. In the method, a measuring signal of the measuring device is detected, which is representative of a power provided by the screwdriver. Depending on the measurement signal, a tire change start time and a tire change end time are determined. Furthermore, the screwdriver is designed compressed air. Furthermore, the measurement signal is representative of a pressure curve during operation of the screwdriver.

The determination of the tire change start time or the tire change end time depending on the measurement signal allows a particularly simple, automated evaluation in a tire change, especially in a pit stop. In particular, the determination of the time duration and thus a feedback to participants of the pit stop can be carried out here individually or task-individually, so that each participant can rate his experiences and thus improve himself. A person-specific statistics on pit stops of a racing season can be easily determined.

A power provided by the screwdriver depends in particular on an air pressure provided to the screwdriver.

In a further advantageous embodiment according to the first aspect, a predetermined first threshold value is provided, with which the measurement signal is compared. Depending on this comparison, an attachment time of the screwdriver is determined, which is representative of a start of the operation of the screwdriver. In addition, depending on the Ansetzzeitpunkt the tire change start time is determined.

Specifically, the first threshold may be representative of a performance characteristic that deviates by 5% or more from the power provided by the nutrunner when the driver is at rest. For example, in the case of a pneumatic screwdriver, the first threshold is 5% below an air pressure applied to the driver in its quiescent state. A first determined attachment time can be considered in particular as a tire change start time.

In a further advantageous embodiment according to the first aspect, a second threshold value is determined as a function of a course of the measurement signal, with which the measurement signal is compared. Depending on this comparison, a weaning time of the screwdriver is determined, which is representative of a stop of the operation of the screwdriver. In addition, depending on the setting time, the tire change end time is determined.

Specifically, the second threshold may be representative of a performance rating that deviates from the power provided by the driver during operation of the screwdriver by 5% or more. For example, in the case of a pneumatic screwdriver, the second threshold is 5% above an air pressure applied to the driver during operation. In this context, for example, a running average over the last measured values of the measuring signal within a predetermined time window is determined, and the setting time depends on a comparison a current measured value of the measuring signal with the mean value performed. The predetermined time window is for example between 25 ms and 100 ms, in particular 50 ms.

A second determined settling time can be considered in particular as a tire change end time. In a further advantageous embodiment according to the first aspect, an end signal is provided which is representative of a manually triggered by a user of the screwdriver signal upon completion of the tire change. Moreover, the tire change end time is determined depending on the end signal and the measurement signal.

For example, the end signal may be a signal provided by operating a switch on the nutrunner.

In a further advantageous embodiment according to the first aspect, a jack-up signal is provided, which is representative of a pressure profile when operating a compressed-air powered jacking device. Depending on the jack signal and the measurement signal, a pit stop start time and / or a pit stop end time is determined.

The jack-up device may in particular be an air lance for jacking up and lowering the vehicle.

According to a second aspect, the invention relates to a system for determining a time period in a tire change of a vehicle. The system includes an automatic screwdriver and a measuring device whose measuring signal is representative of the power provided by the screwdriver. In addition, the system comprises a data processing device, which is signal-technically coupled to the measuring device and configured to perform a method according to the first aspect.

According to a third aspect, the invention relates to a computer program for determining a time period during a tire change of a vehicle. The computer program is designed to carry out a method according to the first aspect when executed on a data processing device.

According to a fourth aspect, the invention relates to a computer program product comprising executable program code, the program code executing the method according to the first aspect when executed by a data processing device.

Embodiments of the invention are explained in more detail below with reference to the schematic drawings.

• 1 ein Ausführungsbeispiel eines Systems zur Ermittlung einer Zeitdauer bei einem Reifenwechsel eines Fahrzeugs,
• 2 ein beispielhafter Signalverlauf bei Durchführung eines Verfahrens zur Ermittlung einer Zeitdauer bei einem Reifenwechsel eines Fahrzeugs, und
• 3 ein Ablaufdiagramm eines Computerprogramms zur Durchführung des Verfahrens gemäß 2.

Show it:

• 1 An embodiment of a system for determining a time period in a tire change of a vehicle,
• 2 an exemplary waveform when performing a method for determining a time period in a tire change of a vehicle, and
• 3 a flowchart of a computer program for performing the method according to 2 ,

Elements of the same construction or function are provided across the figures with the same reference numerals.

It is common in motorsport that stop vehicles in the context of a pit stop in a predetermined area of a racetrack, which includes, inter alia, an automatic screwdriver for loosening and fixing of wheel nuts of the vehicle, as well as a Aufbockeinrichtung for raising and lowering the vehicle for a Tire or wheel change of the vehicle are located. Depending on the vehicle, three persons per wheel of the vehicle for tire or wheel change, a person for operating the jack-up device and a driver of the vehicle at the pit stop may be involved in this case.

For temporal evaluation of the pit stop, in particular with regard to the tire or wheel change, it is conceivable, for example, that this is carried out by means of video analysis. By way of example, one camera per wheel can be used for this purpose, ie a total of four cameras in conventional vehicles, based on which the video analysis can be carried out. A temporal assessment of the pit stop is in this context only possible without any problems over a total time of the pit stop.

Such a video analysis requires a high human screening effort, since autonomized or automated video analyzes are highly complex and error-prone. In addition, a volume of data accumulated is very high and the technology used is costly.

1 1 shows an exemplary embodiment of a system 1 for determining a time period during a tire change of a vehicle 10.

The system 1 comprises a screwdriver 3 which a measuring device 5 to capture a through the screwdriver 3 allocated power is assigned. With the screwdriver 3 it may in particular be an air-powered impact wrench. The measuring device 5 is formed in this context as a pressure sensor, which is integrated as an example in the impact wrench.

The system 1 further comprises a jack-up device 7 , which may also be designed for compressed air, for example, and may also be referred to as an air lift or air lance. The jack-up device 7 is in particular also a sensor unit (not shown in detail) for providing a Aufbocksignals L (see. 2 ), which is representative of the raising or lowering of the vehicle. This sensor unit is in this context, for example, also designed as a pressure sensor, the example in a pressure line of Aufbockeinrichtung 7 arranged or integrated.

The system 1 further includes a data processing device 9 , the signaling technology with the measuring device 5 and the sensor unit is coupled. An exemplary course of the measurement signal M the measuring device 5 as well as the Aufbocksignals L the jack-up device 7 when performing a method for determining a time period in a tire change of a vehicle at a pit stop is in 2 shown. In addition, in 2 also a first threshold S1 and a final signal B represented, for example, by pressing a switch on the screwdriver 3 after completion of the tire or wheel change by a user of the screwdriver 3 can be triggered.

The data processing device 9 In particular, a data / program memory is assigned, on which a program is stored, which is based on the flowchart of 3 will be explained in more detail below.

The program will be in one step P1 started, in which, for example, variables are initialized. In the step P1 For example, first a predetermined first threshold value S1 provided. By way of example, this can depend on a maximum pressure characteristic of the measuring signal M or a pressure characteristic, the measuring signal M at rest of the screwdriver 3 assumes to be determined. In this embodiment, the predetermined first threshold value S1 95% of the pressure characteristic, the measurement signal M at rest of the screwdriver 3 accepts. The program will then be in one step P3 continued.

In the step P3 becomes dependent on the Aufbocksignal L a pit stop start time T1 (see. 2 ). In this embodiment, for example, this is a first low point in the course of Aufbockignals L determined and / or falls below a predetermined pressure characteristic. In other embodiments, the pit stop start time is also conceivable T1 depending on a position of the vehicle 10 determine, for example, as soon as it passes a certain mark in the given area of the racetrack. The determination of the pit stop start time T1 may also depend on the measurement signal M be performed, for example, for verification. The program is then continued in a step P5.

In the step P5 a comparison becomes dependent on the measuring signal M and the predetermined first threshold S1 performed and dependent on the comparison, in particular when falling below the predetermined first threshold S1 through the measurement signal M , a first starting time T2 (see. 2 ). The first attachment time T2 corresponds to a time at which an operation of the screwdriver 3 starts. The first attachment time T2 can therefore also be considered as a tire change start time. The program will then be in one step P7 continued.

In step P7, first depends on the course of the measurement signal M a second threshold (not shown) determined. By way of example, this can be dependent on a minimum pressure characteristic of the measuring signal M or a pressure characteristic, the measuring signal M in an operating condition of the screwdriver 3 assumes to be determined. In this embodiment, the second threshold value is 105% of the pressure characteristic value that the measurement signal M in the operating condition of the screwdriver 3 accepts. In this context, in order to determine the second threshold, in particular an averaging over the last pressure characteristics of the course of the measurement signal M take place, by way of example via the pressure characteristics of the last 50 ms.

Thereupon, a comparison becomes dependent on the measurement signal M and the second threshold value and depending on the comparison, in particular when the second threshold value is exceeded by the measurement signal M , a first deposit time T3 (see. 2 ). The first weaning time T3 corresponds to a time at which an operation of the screwdriver 3 stops. The first weaning time T3 Thus, it can also be considered as a time at which a wheel nut or a wheel nut of the corresponding wheel is released. The program is then continued in a step P9.

In the subsequent step P9, a second startup time is analogous to the step P5 T4 (see. 2 ), which in turn starts an operation of the screwdriver 3. It can be concluded that between the first depositing time T3 and the second attachment time T4 a change of the wheel or tire has taken place. The program is then continued in a step P11.

In the subsequent step P11, a second settling time is analogous to the step P7 T5 (see. 2 ), which in turn stops an operation of the screwdriver 3. It can be concluded that at this time the wheel nut of the corresponding wheel is tightened. In an embodiment variant, the second settling time T5 thus already be regarded as a tire change end time. In a further embodiment, the tire change end time T6 as in 2 additionally shown depending on the end signal B be determined. The program will then be in one step P13 continued.

• - zwischen den Zeitpunkten T1 und T2 als Zeitdauer des Ansetzens des Schraubers 3 („Gun On“),
• - zwischen den Zeitpunkten T2 und T3 als Zeitdauer der Betätigung des Schraubers 3 und Lösen der Radmutter („Nut Off“),
• - zwischen den Zeitpunkten T3 und T4 als Zeitdauer des Reifen- bzw. Radwechsels („Wheel On“),
• - zwischen den Zeitpunkten T4 und T5 als Zeitdauer der Betätigung des Schraubers 3 und Anziehen der Radmutter („Nut On“),
• - zwischen den Zeitpunkten T5 und T6 als Zeitdauer einer Bestätigung am Schrauber 3 zum Auslösen des Endsignals B („Gun Ready“),
• - zwischen den Zeitpunkten T1 und T6 als Zeitdauer des Boxenstopps hinsichtlich des entsprechenden Reifen- bzw. Radwechsels („Corner Time“),
• - zwischen den Zeitpunkten T1 und T7 als Zeitdauer des gesamten Boxenstopps („Total Time“), und
• - zwischen den Zeitpunkten T6 und T7 als Zeitdauer einer Boxenstoppperformanz hinsichtlich des entsprechenden Reifenwechsels („Corner Performance“) ausgewertet. Das Verfahren wird anschließend beendet.

In the step P13 becomes analogous to the step P3 again depending on the Aufbocksignal L a pit stop end time T7 determined. In addition, a temporal evaluation of the individual tasks can be done. This is how a time duration:

• - between times T1 and T2 as the duration of the attachment of the screwdriver 3 ("Gun On"),
• - between times T2 and T3 as duration of operation of the screwdriver 3 and release of the nut ("groove off"),
• - between times T3 and T4 as the period of tire or wheel change ("wheel on"),
• - between times T4 and T5 as the duration of the operation of the screwdriver 3 and tightening the nut ("groove on"),
• - between times T5 and T6 as a period of confirmation on the screwdriver 3 to trigger the end signal B ("Gun Ready"),
• - between times T1 and T6 as the duration of the pit stop with regard to the corresponding tire or wheel change ("corner time"),
• - between times T1 and T7 as the duration of the entire pit stop ("Total Time"), and
• - between times T6 and T7 evaluated as the duration of a pit stop performance with respect to the corresponding tire change ("Corner Performance"). The process is subsequently terminated.

Advantageously, the method offers the possibility of a direct numerical breakdown of the pit stop into several phases, such as the time periods mentioned above. It provides direct feedback after the pit stop by automatically analyzing the recorded data. Through the direct feedback, each participant in the pit stop can evaluate his recent experience and thus improve. A statistics on pit stops for a whole season is person-specific easy to carry out.

LIST OF REFERENCE NUMBERS

M

measuring signal

L

Aufbocksignal

B

end signal

S1

threshold

T1

Pit stop start time

T2

Ansetzzeitpunkt

T3

weaning

T4

Ansetzzeitpunkt

T5

weaning

T6

Tire change end time

T7

Pit stop end time

P1, ..., P13

program steps

Claims (8)

A method for determining a time period in a tire change of a vehicle with an automatic screwdriver and a measuring device, in which a measurement signal (M) of the measuring device is detected, which is representative of a power provided by the screwdriver, - Depending on the measurement signal (M) a tire change start time and a tire change end time are determined, the screwdriver is designed compressed air and the measurement signal (M) is representative of a pressure curve during operation of the screwdriver. Method according to the preceding claim, in which a predetermined first threshold value (S1) is provided, with which the measuring signal (M) is compared, - is determined depending on this comparison a Ansetzzeitpunkt (T2, T4) of the screwdriver, which is representative of a start of the operation of the screwdriver, and - Is determined depending on the Ansetzzeitpunkt (T2) of the tire change start time. Method according to one of the preceding claims, in which - depending on a course of the measuring signal (M) a second threshold value is determined, with which the measuring signal (M) is compared, - determined depending on this comparison, a setting time (T3, T5) of the screwdriver which is representative of a stop of the operation of the screwdriver, and - depending on the Absetzzeitpunkt (T5), the tire change end time is determined. Method according to one of the preceding claims, in which providing an end signal (B) representative of a manually triggered by a user of the screwdriver signal upon completion of the tire change, and - Is determined depending on the end signal (B) and the measurement signal (M) of the tire change end time. Method according to one of the preceding claims, in which providing a jack-up signal (L) representative of a pressure profile when operating a pneumatic jacking device, and - A pit stop start time (T1) and / or a pit stop end time (T7) is determined depending on the Aufbocksignal (L) and the measurement signal (M). System for determining a period of time during a tire change of a vehicle, having - an automatic screwdriver and a measuring device whose measuring signal (M) is representative of a power provided by the screwdriver, and - a data processing device that is signal-coupled to the measuring device and designed, a method according to one of Claims 1 to 5 perform. Computer program for determining a time period in a tire change of a vehicle, wherein the computer program is formed, a method according to one of Claims 1 to 5 when executed on a data processing device. Computer program product comprising executable program code, wherein the program code when executed by a data processing device, the method according to one of Claims 1 to 5 performs.

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