DE102018112590A1 - Method for adapting a speed limit of a truck and control system for controlling a forklift fleet - Google Patents

Abstract

The invention relates to a method for adapting a speed limit of a forklift 101. The method comprises detecting a speed profile 200a over a first time period by an electronic control of the industrial truck 101; Setting a limit speed for the industrial truck 101 for a second period of time; Determining, by a control system 104, a first travel time of the truck 101 from the sensed speed profile 200a for returning a summed distance of the truck 101 in the first time period that has traveled at speeds above the limit speed; Determining a second travel time of the truck 101 for returning the summed range of the truck 101 at the limit speed by the control system 104; Determining a time difference of the first travel time and the second travel time by the control system 104; and transmitting a control signal from the control system 104 to the truck 101 when the determined time difference is shorter than a down time of the truck 101 in the first period, the control signal being arranged to set the limit speed as the speed limit of the truck 101 for the second period. The invention further relates to a control system 104.

Description

The invention relates to a method for adjusting a speed limit of a truck and a control system for controlling a truck fleet.

Industrial trucks can be used when loads are to be moved. In this case, a single industrial truck or a fleet of industrial trucks, i. an industrial truck fleet, to be used from at least two industrial trucks.

Industrial trucks are used for example in a company. Here, the trucks can be used in different terrain, such as in a hall, an outdoor area or a security area in which people can stay, so that an increased level of security is desired.

The trucks can drive a maximum speed forwards or backwards. For example, some industrial trucks can travel 24 km / h fast.

A high speed can be advantageous because a larger distance can be driven in a certain time. Thus, more loads can be moved in the same time compared to driving at a lower speed.

With a high driving speed, the safety, especially for persons, can decrease, since an accident risk can depend on the speed. For example, a person has more time to dodge a truck when it is traveling at a slow speed. Likewise, a truck driver can more easily avoid an obstacle when the truck is slow.

Here, a balance can take place to keep the safety in operation high and still keep the efficiency of the truck fleet or the truck just as high.

The present invention has for its object to provide an improved concept to adjust a speed limit of a truck.

• Erfassen eines Geschwindigkeitsprofils über einen ersten Zeitraum durch die elektronische Steuerung des Flurförderzeugs;
• Festlegen einer Grenzgeschwindigkeit für das Flurförderzeug für einen zweiten Zeitraum;
• Ermitteln einer ersten Fahrzeit des Flurförderzeugs aus dem erfassten Geschwindigkeitsprofil für das Zurücklegen einer summierten Strecke des Flurförderzeugs in dem ersten Zeitraum, die mit Geschwindigkeiten gefahren wurde, die über der Grenzgeschwindigkeit liegen, durch das Steuersystem;
• Ermitteln einer zweiten Fahrzeit des Flurförderzeugs für das Zurücklegen der summierten Strecke des Flurförderzeugs mit der Grenzgeschwindigkeit durch das Steuersystem;
• Ermitteln einer Zeitdifferenz aus der ersten Fahrzeit und der zweiten Fahrzeit durch das Steuersystem;
• Übertragen eines Steuersignals von dem Steuersystem an das Flurförderzeug wenn die ermittelte Zeitdifferenz kürzer ist als eine Stillstandsdauer des Flurförderzeugs in dem ersten Zeitraum, wobei das Steuersignal eingerichtet ist, die Grenzgeschwindigkeit als Tempolimit des Flurförderzeugs für den zweiten Zeitraum festzulegen.

According to a first aspect, the object is achieved by a method for adjusting a speed limit of a truck. The truck includes an electronic controller that is set up to detect driven speeds. The truck is communicatively connected to a control system. The method comprises:

• Detecting a speed profile over a first period of time by the electronic control of the truck;
• Setting a limit speed for the truck for a second period;
• Determining, by the control system, a first travel time of the truck from the sensed speed profile for returning a summed distance of the truck in the first time period that has been traveled at speeds that are above the limit speed;
• Determining a second travel time of the truck for the covering of the summed range of the truck with the limit speed by the control system;
• Determining a time difference from the first travel time and the second travel time by the control system;
• Transmission of a control signal from the control system to the truck when the determined time difference is shorter than a downtime of the truck in the first period, wherein the control signal is arranged to set the limit speed as the speed limit of the truck for the second period.

The truck may be a forklift. It can also be another truck, for example, a warehouse truck.

The truck may be part of an industrial truck fleet comprising at least two trucks. The truck may include an electronic control that can detect and store the truck's speeds. For this purpose, a speed sensor can be used.

The speed can be detected in a first period, in particular a day or a shift. By detecting the speeds of the truck, a speed profile can be created. The speed profile may include at any speed between a minimum speed and a maximum speed the duration for which each speed was driven. For example, it can be detected that the truck drove for 5 hours at 0 km / h on one day, ie had a standstill period of 5 hours and 1 hour at 1 km / h and 0.6 hours at 2 km / h, etc. driven is. The first period can be the total time traveled or one day or the Duration of an order or another time range.

Likewise, the speed profile may include speeds for reversing. This speed amounts can be detected and assigned a reverse drive.

The limit speed can be determined and determined by the control system. The limit speed can also be set by a user. In particular, the setting of the limit speed may include a reduction of the previous maximum speed, for example, to increase the safety in the operation in which the truck is used.

The speed limit can apply for a second period. In particular, the second period may include a period following the first period that is as long as the first period. For example, the first period and the second period are each one day long. Likewise, the second period may be different from the first period, for example, be infinitely long from a time point.

If the speed profile shows that the truck has traveled at a speed that is greater than the limit speed, then the total distance of all traveled speeds that are greater than the limit speed can be determined. For this, the distance traveled can be determined at any speed and the distances determined in this way can be summed up to form a summed distance.

If the speed of the truck is to be restricted or throttled to the limit speed, then this summed distance must be covered in the second period with at most the limit speed if the same total distance is to be covered in the second period.

The actual travel time the truck needed in the first period is determined as the first travel time for the summed distance. Furthermore, it can be determined which travel time is expected to be needed in the second period when the summed distance is driven at the limit speed.

From these two travel times, the time difference can be formed, which indicates how much longer the truck takes longer in the second period for the same summed distance than in the first period. Thus, the time difference also indicates how much longer the truck takes in the second period for the same total distance longer than in the first period, since the durations of the speeds less than or equal to the limit speed from the first period in the second period substantially equal be considered. Here, 0 km / h can be an exception, as this indicates the downtime of the truck, which is changeable by adjusting the speed limit.

The control system may include fleet management software and provide a control signal that provides the truck with a speed limit. The speed limit may correspond to the limit speed. For this purpose, the control system checks whether the downtime of the truck in the first period is at least as large as the determined time difference. In this case, the truck can travel the same distance in the second period as in the first period, if both periods are the same length. That is, the first period includes a day and the truck has in the second period, in particular a following day to fulfill a comparable task, so to drive a substantially equal total distance, then the truck can do so despite the limitation of the maximum speed as a speed limit meet the limit speed.

By this method, a speed limit for an industrial truck can be set automatically by the control system, the control system checks the utilization of the truck to keep the efficiency of the truck high. Planning can be based on the data as to whether additional material handling equipment is needed to compensate for the necessary speed limitation. The control system can thus automatically adapt the vehicle control, the order control and the logistics processes.

In an embodiment, determining the first travel time comprises forming a sum of travel times of the speed profile associated with speeds greater than the limit speed.

The reading of travel times from the speed profile allows a summation. This can be an easy way to determine the first driving time. The first travel time represents the driven time that the truck has traveled faster in the first period than the limit speed.

In one embodiment, determining the second driving time includes determining a length of the summed distance based on the speed profile.

By determining the first driving time, the driving time for the return of the summed distance is known. From the speed profile, the individual driving times for each speed are known. From this the length of the summed distance can be determined. For each speed can be determined with the associated driving time, which distance was traveled at this speed. This can be done for any of the speeds greater than the limit speed. The sum of the lengths of these routes is the length of the summed route. It is also possible to use an average value of the speeds and driving times.

In one embodiment, the following step is additionally performed before the step of determining the first travel time: transferring the speed profile from the industrial truck to the control system.

The truck determines the speed profile. The truck can transmit the speed profile to the control system. This can be done wirelessly via a radio link, for example via a communication unit. Likewise, the speed profile can be read via a cable, for example, during a standstill of the truck.

In one embodiment, the following additional step is carried out:

Transmission of a control signal from the control system to the truck when the determined time difference is longer than the downtime of the truck in the first period, wherein the control signal is configured to set a modified limit speed as the speed limit of the truck, the changed limit speed based on the downtime of the truck and the length of the summed distance can be determined by the control system such that the travel time difference corresponds at most to the standstill duration.

The limit speed may represent a desire for increased security. However, it can be seen as a suggestion and not as a mandatory limit. In this case, the control system can be given the power to autonomously change the limit speed automatically, in particular to increase it.

This may be useful if an increase in safety is to be sought on the site on which the truck is driving and at the same time the truck should be able to leave the covered in the first period distance in the second period. Here, the efficiency and the utilization of the truck is kept high, while increasing safety on the premises by reducing the speed limit, so far that the truck can still cover the total distance in the second period.

• Ermitteln einer Stillstandszeit eines weiteren Flurförderzeugs durch das Steuersystem, wenn die ermittelte Zeitdifferenz länger ist als die Stillstandsdauer des Flurförderzeugs in dem ersten Zeitraum;
• Übertragen eines Steuersignals von dem Steuersystem an das Flurförderzeug wenn die ermittelte Zeitdifferenz länger ist als eine Stillstandsdauer des Flurförderzeugs in dem ersten Zeitraum und wenn die Stillstandszeit des weiteren Flurförderzeugs größer ist als die Differenz der ermittelten Zeitdifferenz und der Stillstandsdauer des Flurförderzeugs in dem ersten Zeitraum, wobei das Steuersignal eingerichtet ist, die Grenzgeschwindigkeit als Tempolimit des Flurförderzeugs festzulegen.

In one embodiment, the following additional steps are performed:

• Determining a downtime of another truck by the control system when the determined time difference is longer than the downtime of the truck in the first period;
• Transmission of a control signal from the control system to the truck when the determined time difference is longer than a downtime of the truck in the first period and when the downtime of the further truck is greater than the difference of the determined time difference and the downtime of the truck in the first period, wherein the control signal is set to set the limit speed as the speed limit of the truck.

The further truck and the truck can form a fleet of industrial trucks. The further truck may be of the same or a similar type as the truck. It can be designed to carry the same loads as the truck. The further truck may be an industrial truck of a plurality of different or identical trucks of the fleet of industrial trucks.

The further truck, like the truck, can record a speed profile and make it available to the control system. The control system can access the speed profile of the truck and the truck. Thus, the downtime of the other truck can be determined as in the truck.

If the truck can not make the entire route at the limit speed in the second period, the route that the truck can not handle can be assigned to the further truck. As a result, the speed limit can be met as speed limit in the truck. The speed limit can be adjusted so that it is still sufficient for safety and at the same time the fleet of industrial trucks can still do their job. Compensation proposals can be made to maintain efficiency and performance in the fleet.

In one embodiment, the further industrial truck is selected by the control system according to at least one of the following parameters from a plurality of further industrial trucks: series, drive type, attachment, carrying capacity, location, external dimensions.

The further truck should be able to take over the tasks of the truck. Therefore, the further truck on the basis of the above parameters, in particular master data of the other truck, be selected to ensure that the further truck can cope with the task. Furthermore, the control system may make the selection based on usage data, which may in particular be captured by the control system. Such usage data includes utilization, shift model, operating hours, difference to an operating hour limit, transported loads or weights, availability of drivers, and other data or quantities.

In one embodiment, the limit speed includes a forward speed or a reverse speed.

The limit speed may include the speed of the truck in the forward direction, but also in the reverse direction. In the following, a positive speed is assumed, regardless of whether the truck is moving forwards or backwards. That is, even if the limit speed is given as positive, it can serve as the limit speed for the reverse direction. A separate description of a negative speed is omitted here. Regardless, the velocity profile for distinguishing the direction of the velocity may capture the velocity of the sign. Likewise, in this context, terms such as in particular "maximum speed" are to be understood as a speed amount and are not intended to be limiting with respect to the driven direction of the industrial truck. The limit speed can be set separately or uniformly for the forward direction and the backward direction.

In one embodiment, setting the limit speed includes setting a location zone for which the limit speed is to apply. In the step of determining the first travel time and the step of determining the second travel time, the summed distance is limited to a part of the summed distance that lies in the location area. The control signal couples the speed limit here to the location zone.

The area zone may be a hall, an outdoor area, an area where people are staying, a space for pauses with increased passenger traffic or another local area.

The truck may in this case be equipped with a sensor which, in conjunction with other sensors, can detect a position on the premises of the industrial truck operator. Sensors in this sense include active and / or passive sensors, such as RFID tags and RFID sensors. For example, the truck has a mark that is detected by sensors at a driveway, or vice versa.

This allows the truck to detect whether it is in the zone or not. Thus, a speed limit set by the truck control system can be implemented by the truck depending on the location. Here, a maximum possible speed of the truck is reduced to the applicable speed limit.

To calculate the utilization of the truck by the control system, i. In order to determine whether the limit speed is sufficient to create the distance traveled in the first period in the second period, the location zone can be taken into account by the control system. If, for example, only one limit speed is present for part of the summed distance, then a shorter downtime of the truck is sufficient to cover the entire first distance under the condition of the location zone and the limit speed, as if the location area were greater. As a result, the efficiency of the fleet of industrial trucks can be further increased.

In one embodiment, setting the limit speed includes setting a time zone for which the limit speed is to apply. In the step of determining the first driving time, the detected speed profile is limited to the time period that lies in the time zone. The control signal couples the speed limit to the time zone.

As with the location zone, the control system can also take a time zone into account. For example, such a time zone may be at night or be coupled to a break area from 9:00 to 10:00 along with a location zone.

As a result, the safety can be variably adjusted by setting a lower speed of the truck. As a result, a high degree of security can be ensured with a high level of efficiency.

• Ermitteln einer Differenzstrecke aus der summierten Strecke und einer mit der Grenzgeschwindigkeit in der ersten Fahrzeit zurücklegbaren Strecke;
• Ausgeben der Differenzstrecke auf einer Ausgabeeinrichtung des Steuersystems.

In one embodiment, the following additional steps are performed:

• Determining a difference distance from the summed distance and a distance traceable with the limit speed in the first drive time;
• Outputting the difference distance on an output device of the control system.

The presentation of the difference distance can show an operator of the control system how large the difference in distance that the truck can not cover due to the speed limit at the limit speed.

This can be used to improve planning for fuel or availability of industrial trucks from the fleet. Fewer planning errors lead to less unfamiliar situations for the driver and thus further increase safety on the premises of the company.

In one embodiment, following the step of determining a time difference, the following step is performed:

Displaying a message on an output device of the control system and canceling the method prior to the step of transmitting the control signal if an abort signal has been received upon displaying the message.

The message may include the speed limit that can be set using the control signal. In this case, a user can abort the method and prevent the transmission of the control signal if he does not want to transmit the control signal due to the message displayed. The display can be done on a display device, in particular a screen. As a result, erroneous transfers can be prevented.

According to a second aspect, the object is achieved by a control system for controlling a forklift truck comprising an industrial truck, wherein the industrial truck is adapted to detect a speed profile over a first period by an electronic control of the truck and to transmit the speed profile to the control system the control system is adapted to detect a fixed limit speed for the truck for a second period and to determine a first travel time of the truck from the detected speed profile for covering a summed range of the truck in the first period, which was driven at speeds that above the limit speed. The control system is set up to determine a second travel time of the industrial truck for covering the accumulated distance of the industrial truck at the limit speed and to determine a time difference between the first travel time and the second travel time. The control system is adapted to transmit a control signal to the truck if the determined time difference is shorter than a downtime of the truck in the first period, wherein the control signal is arranged to set the limit speed as the speed limit of the truck for the second period.

By the control system, in particular a forklift control system, for example, the method described above can be implemented. A fleet of industrial trucks can be controlled so that the speed limits of each truck can be adjusted accordingly, so that the utilization of the fleet, taking into account the speed limit as a speed limit, possibly location or time zone related, can be kept efficient.

In one embodiment, the control system is configured to transmit a control signal to the truck when the determined time difference is longer than the downtime of the truck in the first period, the control signal is set to set a modified limit speed as the speed limit of the truck, the changed Limit speed based on the downtime of the truck and the length of the summed distance from the control system can be determined so that the travel time difference corresponds at most to the downtime.

Thus, a mediocre between safety by low speed of the truck and efficiency in the utilization of the truck can be found.

In one embodiment, the control system is configured to determine a downtime of another truck if the determined time difference is longer than the downtime of the truck in the first period. The control system is in this case set up to transmit a control signal to the truck when the determined time difference is longer than the downtime of the truck in the first period and when the downtime of the truck is greater than the difference of the determined time difference and the downtime of the truck in the first period, wherein the control signal is set to set the limit speed as the speed limit of the truck.

Thus, the control system can consider the further truck to compensate for the extra time required and thus ensure compliance with the speed limit as a speed limit of the truck.

In one embodiment, the control system is set up to allocate an additional travel time to the further truck, which corresponds to the difference of the determined time difference and the downtime of the truck in the first period, when the control signal was transmitted to the truck, although the determined time difference is longer than the downtime of the truck in the first period.

The additional travel time requires the truck to drive around the distance that the truck can not make. In this way, the tasks can be redistributed and the overall utilization of the fleet can be clearly planned and planned depending on the existing trucks in the fleet.

• 1 eine schematische Darstellung einer Anordnung mit einem Flurförderzeug gemäß einem Ausführungsbeispiel;
• 2a eine schematische Darstellung eines Geschwindigkeitsprofils;
• 2b eine weitere schematische Darstellung eines Geschwindigkeitsprofils;
• 2c eine schematische Darstellung einer Auslastungsübersicht;
• 3 eine schematische Darstellung eines Geländes mit einem Flurförderzeug gemäß einem Ausführungsbeispiel; und
• 4 eine schematische Darstellung eines Flussdiagramms für ein Verfahren gemäß einem Ausführungsbeispiel.

Further advantages and details of the invention will be explained in more detail with reference to the schematic figures and exemplary embodiments. This shows

• 1 a schematic representation of an arrangement with a truck according to an embodiment;
• 2a a schematic representation of a velocity profile;
• 2 B a further schematic representation of a velocity profile;
• 2c a schematic representation of a utilization overview;
• 3 a schematic representation of a terrain with a truck according to an embodiment; and
• 4 a schematic representation of a flowchart for a method according to an embodiment.

The 1 shows an arrangement 100 according to an embodiment. The order 100 includes a truck 101 , In the illustrated embodiment, the truck 101 a forklift. In another embodiment, it is a different type of truck.

The truck 101 has a detection unit 102 which is set up, the speed of the truck 101 capture. The registration unit 102 measures the speed of the truck 101 by detecting a physical parameter of the truck 101 , in particular a number of revolutions. In another embodiment, the speed of the truck 101 via a position determination, in particular via a GPS detection, or else in another suitable manner.

The truck 101 can with the capture unit 102 create a speed profile that captures the time at which this speed was driven for each driven speed. The registration unit 102 includes an electronic tax system.

The truck 101 has a communication unit 103 on. In the embodiment shown, the communication unit 103 a radio module, which is set up to communicate wirelessly, in particular to transmit and receive radio signals.

With the communication unit 103 can the truck 101 transfer the acquired speed profile to a database.

The order 100 includes a tax system 104 , In the tax system 104 it is a so-called forklift control system, which is set up to detect, plan and display a utilization of an industrial truck, in particular a fleet of industrial trucks. In another embodiment, it is another type of management system for managing a fleet of industrial trucks.

The tax system 104 is set up, control signals to trucks, especially the truck 101 , transferred to. For this the control system sends 104 via a wireless communication device (not shown for reasons of clarity) a control signal. In a further embodiment, the transmission of control signals takes place wired. For this purpose, a charging cable for transmitting electrical energy from a charging station in an energy storage of the truck 101 additionally transmit data signals, in particular control signals.

The tax system 104 manages the truck data 101 and other trucks of the fleet of industrial trucks. This is how the speed profile of the truck becomes 101 to the tax system 104 transferred and stored in a database of the tax system 104 stored and through the tax system 104 managed. In addition, the tax system manages 104 Orders for the industrial trucks and a utilization of the industrial trucks.

The 2a and the 2 B each show a velocity profile 200a . 200b of the truck 101 , On the abscissa axis is the speed of the truck 101 in km / h, applied to the truck 101 can drive due to design. If a speed was not driven, the value is 0 , On the ordinate axis, the duration of the speeds is indicated by the height of the respective bar in hours, in a further embodiment in minutes, seconds or another unit of time. For the sake of clarity, the speed profiles are kept schematic, that is, not every speed is in the 2a and 2 B even if the speed profile includes all speeds.

The 2a shows a speed profile 200a over a first period, especially one day. The speed 0 , that is, the downtime of the truck 101 was the longest compared to the other driven speeds. Very high speeds, for example 24 km / h, were driven less frequently than low speeds. Reversing are in the 2a and 2 B indicated by minus sign.

The first period is one day, that is in the speed profile 200a out 2a are the durations of all truck speeds 101 deposited, which the truck 101 drove in one day. The speed profile 200a can be like in 2a schematically represented by the control system 104 be displayed on an output device. In this display, of course, any speed displayed and from a purely schematic view as in the 2a and 2 B be disregarded.

The 2 B shows another speed profile 200b , The speed profile 200b shows a determined speed profile, which is a planning for the utilization of the truck 101 should facilitate.

About the tax system 104 a fleet manager can set a speed limit. In the embodiment, the limit speed is set to 16 km / h. This is in the 2a and 2 B represented by the dashed vertical line passing through both velocity profiles 200a . 200b enough. In another embodiment, the limit speed may be set to a different value and / or additionally include a limit speed for reversing.

In the first period is the truck 101 partly driven faster than the limit speed. These speeds are above the limit speed in an upper range 202 ,

Determining the limit speed to 16 km / h can increase safety on an operating railing. As a result, however, the truck 101 the speeds in the upper area 202 do not drive anymore.

In a second time range, in particular a following day, which is as long as the first time range and corresponding requirements for the industrial truck 101 stops, the truck must 101 so cover the distance traveled in the first time range, without those in the upper range 202 to be allowed to drive at low speeds.

In the 2 B is the speed profile 200b shown showing this case. Here, the speeds in the upper area omitted 202 , ie the speeds greater than the limit speed, here 16 km / h. This is in 2 B shown by the bars in the upper area being dashed.

As the truck 101 These high speeds can no longer drive, the distance, in the first time range of 2a has been traveled at speeds above the limit speed, driven at the limit speed, in order to minimize a total travel time despite the limitation on the limit speed. This increases the time that the limit speed is driven. This is in 2 B on the extended beam 201 to see. During the bar 201 in 2a short, this one is in 2 B longer, as this speed has to be kept longer.

This increases the total time for the total distance that the truck 101 drove in the first period. This time increase is a time difference that is needed for the same distance longer.

The same as to the 2a and 2 B can be used accordingly for a limit speed for reversing.

The 2c shows a schematic utilization view of two trucks. Here, the abscissa represents a time course. In the rows A1 . A2 . B1 and B2 operating times of the two trucks are plotted. The rows A1 and A2 are the truck 101 assigned. The rows B1 and B2 are assigned to the further truck of the industrial truck fleet. The boxes indicate an active period in which the trucks are active, ie busy. The areas of the rows in which no boxes are displayed, represent downtime of the trucks.

The rows A1 and B1 show a utilization of the truck 101 or of the further truck in the first time range. Both trucks have downtime and active times in the first time range.

The rows A2 and B2 show a utilization of the truck 101 or of the further truck, in the event that the speed limit as described above for the truck 101 is limited to the limit speed. The active time increases according to the speed limit as above 2a and 2 B described for the truck 101 , the boxes showing the truck's active times 101 in row A2 show are shown accordingly longer.

Here come in series A2 two overlaps X on, ie the duration of two active times has extended more than the downtime, between the corresponding active time in series A1 , This overlap X can the truck 101 so do not cope.

These times will be as in column B2 transferred to another truck if this has the necessary capacity, which is the case in the illustrated embodiment. The carry is indicated by the arrows. The in series B2 compared to row B1 additional boxes represent additional active times of the further truck, the times of the truck 101 compensate for the utilization of the truck 101 could not be overcome.

Thus, the truck must 101 can not cope with the overlapping time periods and can do the stint. The further truck has additional active time.

The 3 shows a company premises 300 , The factory premises 300 has a hall 301 and a security zone 302 on. Furthermore, any area that is not within these areas is considered an outdoor area. The hall 301 indicates an entrance / exit to the safety zone 302 go on and another entrance / exit. The entrances / exits are with sensors 303 provided in the 3 represented by bold dots. The sensors 303 are set up, the truck 101 capture. For this purpose, the truck 101 a marker on the truck 101 identify. In a further embodiment, the detection takes place differently or not.

In the different zones 301 . 302 and the outdoor area, different border speeds can be set.

The 4 shows a schematic flow diagram 400 for a method according to an embodiment.

In one step 401 are speeds of the truck 101 detected. For this purpose, the detection unit detects 102 of the truck 101 the speed of the truck 101 and measures the duration that this speed was driven. This results in the velocity profile 200a for the first period. The speed profile 200a is transferred to a database to which the control system 104 Has access.

In step 402 a limit speed is set that the truck 101 in the future, that is, to be able to drive at most in a second period. In the described embodiment, the limit speed is set to 16 km / h.

In the exemplary embodiment, the limit speed is set for a zone, here the safety zone 302 , In another embodiment, the limit speed is set differently or uniformly for different location zones and / or time zones.

For example, for the hall 301 a limit speed for forward of 8 km / h and for reverse of 6 km / h and for the safety zone 302 From 9 am to 12 pm, a speed limit of 4 km / h for forwards and backwards, and 6 km / h outside this time, and for outside, a limit speed for forward and backward of 16 km / h. In other embodiments, these values and zones may be set differently.

In step 403 is from the tax system 104 a first driving time determined. The first driving time indicates how long the truck is 101 at speeds in the upper range 202 drove. That is, it determines how long the truck will take 101 has been used for a summed distance, which is formed from the sum of the distances traveled, with the speeds above the limit speed in the upper range 202 were driven.

The control system calculates to determine the summed distance 104 at any speed above the limit speed, the distance traveled from the speed and the recorded duration from the speed profile.

In step 404 a second travel time is determined on the basis of the previously determined summed distance. The second driving time indicates how long the truck is 101 for the summed distance needs, if this is driven at the limit speed.

In step 405 the difference of the first travel time and the second travel time is calculated, and thus determines a time difference that indicates how much longer the truck 101 for the summed distance needs, if this is driven with only the limit speed.

This indicates an increase in the total travel time of the truck 101 takes longer in the second period for the same route as in the first period.

Here, the tax system takes into account 104 the zone dependency, ie whether the limit speed was defined as a function of a location zone and / or a time zone.

In step 406 the time difference becomes with a downtime of the truck 101 compared. The downtime is here pausenbereinigt, that is, scheduled breaks, such as a mandatory lunch break for a driver or for a driver change are deducted. In another embodiment, the absolute down time is taken without taking breaks into account.

This can take into account whether the truck 101 was actively used or how long a driver in the truck 101 was logged in. This is taken into account when determining the downtime.

The comparison can be made separately for each leg which was driven in the first period, that is to say to the individual completed orders, so that an extension of each order takes place. For this, the first period can be varied or subdivided.

By comparing from step 406 represents the tax system 104 determines if the truck 101 has the time difference available and thus has the opportunity to create the same route as in the first period also in the second period in which the speed limit is set to the limit speed.

Has the tax system 104 in step 406 found that the truck 101 has more downtime than the time difference is long, so in step 407 the speed limit for the truck 101 fixed at the limit speed.

For this the control system sends 104 a control signal to the truck 101 to set the speed limit to the limit speed.

In another embodiment, prior to transmission of the control signal, a message may be output that indicates to a user that the speed limit should be set. The user can then use the control system 104 to prevent the speed limit from being set. In a further embodiment, no control signal is sent and the speed profiles are displayed only correspondingly on an output device.

Has the tax system 104 in step 406 found that the truck 101 has less downtime, as the time difference is long, so in step 408 Checks whether there is another truck in the fleet of industrial trucks that meets the technical requirements as a replacement vehicle and has enough downtime to compensate for the time that the truck has 101 can not handle.

If no further truck is available, then in step 409 the limit speed is changed, that is, increased, that the time difference corresponds to the standstill time or a selected lower value. The tax system determines this 104 an altered limit speed by increasing the speed value of the limit speed and recalculates the time difference as described above.

If the limit speed changed in this way is high enough that the time difference corresponds to the standstill time, then this changed limit speed becomes a speed limit by means of a control signal to the industrial truck 101 sent to set the speed limit to the changed speed limit.

Will in step 408 determined that another truck is available, then the truck 101 the limit speed as the speed limit as above to step 407 described in step 410 and the additional truck in step 411 assigned to the truck 101 can not meet. In another embodiment, prior to the assignment or instead of the assignment, a message indicating that redistribution is issued. Hereupon a user, in particular a fleet manager, can react and if necessary intervene manually.

In a further embodiment, additional messages are created, the other systems networked with the control system, such as a dealer system or another fleet management system, the restructuring of the utilization of the truck 101 and optionally indicate the further truck. For example, such a rental vehicle can be booked automatically or a lease for the truck 101 be automatically adjusted.

LIST OF REFERENCE NUMBERS

100

arrangement

101

Truck

102

acquisition unit

103

communication unit

104

control system

200a, 200b

velocity profile

201

bar

202

Area

300

premises

301

Hall

302

security zone

303

sensor

400

flow chart

401 - 411

step

A1, A2, B1, B2

line

X

overlap

Claims (16)

A method of adjusting a speed limit of an industrial truck (101), the truck (101) comprising an electronic controller adapted to detect speeds traveled, and wherein the truck (101) is communicatively connected to a control system (104), comprising: • detecting a speed profile (200a) over a first period of time by the electronic control of the truck (101); Setting a limit speed for the industrial truck (101) for a second time period; Determining, by the control system (104), a first travel time of the truck (101) from the detected speed profile (200a) for returning a summed distance of the truck (101) in the first time period, which was traveled at speeds above the limit speed ); • Determining a second travel time of the truck (101) for covering the summed range of the truck (101) with the limit speed by the control system (104); • determining a time difference from the first travel time and the second travel time by the control system (104); and Transferring a control signal from the control system (104) to the industrial truck (101) if the determined time difference is shorter than a standstill period of the industrial truck (101) in the first period, the control signal being set up, the limit speed being the speed limit of the industrial truck (101) for the second period. Method according to Claim 1 wherein determining the first travel time comprises forming a sum of travel times of the speed profile (200a) associated with speeds greater than the limit speed. The method of claim 1, wherein determining the second travel time comprises determining a length of the summed distance based on the velocity profile. Method according to one of the preceding claims, wherein additionally the following step is carried out before the step of determining the first travel time: • Transferring the speed profile (200a) from the truck (101) to the control system (104). Method according to one of the preceding claims, wherein additionally the following step is carried out: • transmitting a control signal from the control system (104) to the truck (101) if the determined time difference is longer than the downtime of the truck (101) in the first period, the control signal is set, a changed limit speed as the speed limit of the truck (101 ), wherein the modified limit speed based on the downtime of the truck (101) and the length of the summed distance from the control system (104) is determinable so that the travel time difference corresponds at most to the standstill period. Method according to one of the preceding claims, wherein additionally the following steps are carried out: • Determining a downtime of another truck by the control system (104) if the determined time difference is longer than the downtime of the truck (101) in the first period; • Transmission of a control signal from the control system (104) to the truck (101) if the determined time difference is longer than a downtime of the truck (101) in the first period and when the downtime of the further truck is greater than the difference of the determined time difference and the stoppage period of the truck (101) in the first period, wherein the control signal is arranged to set the limit speed as the speed limit of the truck (101). Method according to Claim 6 wherein the further industrial truck (101) is selected by the control system (104) according to at least one of the following parameters from a plurality of further industrial trucks will: Series, Drive, Attachment, Capacity, Location, External Dimensions. Method according to one of the preceding claims, wherein the limit speed comprises a forward speed or a reverse speed. Method according to one of the preceding claims, wherein the setting of the limit speed comprises a setting of a location zone (301, 302) for which the limit speed is to apply, wherein in the step of determining the first travel time and the step of determining the second travel time, the summed distance is limited to a portion of the summed path that lies in the location zone (301, 302) and wherein the control signal couples the speed limit to the location zone (301, 302). The method of claim 1, wherein setting the limit speed comprises setting a time zone for which the limit speed is to apply, wherein in the step of determining the first drive time, the detected speed profile is limited to the time period in the time zone and wherein the control signal couples the speed limit to the time zone. Method according to one of the preceding claims, wherein additionally the following steps are carried out: Determining a difference distance from the summed distance and a distance that can be covered with the limit speed during the first drive time; Outputting the difference distance on an output device of the control system (104). Method according to one of the preceding claims, wherein after the step of determining a time difference, the following step is carried out: • displaying a message via an output device of the control system (104) and aborting the method prior to the step of transmitting the control signal if a abort signal has been received upon displaying the message. A control system (104) for controlling an industrial truck fleet comprising an industrial truck (101), wherein the industrial truck is adapted to detect a speed profile (200a) over a first period by an electronic control of the industrial truck (101) and the speed profile (200a) to the Control system, the control system (104) being adapted to • to record a specified limit speed for the industrial truck (101) for a second period of time; Determining a first travel time of the truck (101) from the detected speed profile (200a) for returning a summed distance of the truck (101) in the first time period that has been traveled at speeds that are above the limit speed; • determine a second travel time of the truck (101) for covering the summed distance of the industrial truck (101) with the limit speed; Determine a time difference between the first travel time and the second travel time; and • transmit a control signal to the truck (101) if the determined time difference is shorter than a downtime of the truck (101) in the first period, the control signal is set, the limit speed as the speed limit of the truck (101) for the second period set. Control system (104) after Claim 13 wherein the control system (104) is arranged to • transmit a control signal to the truck (101) if the determined time difference is longer than the downtime of the truck (101) in the first period, the control signal being established, an altered limit speed set as the speed limit of the truck (101), wherein the modified limit speed based on the downtime of the truck (101) and the length of the summed distance from the control system can be determined so that the travel time difference corresponds at most to the downtime. Control system (104) after Claim 13 or 14 wherein the control system (104) is arranged to • determine a downtime of another truck when the determined time difference is longer as the stoppage period of the truck (101) in the first period; and • to transmit a control signal to the truck (101) if the determined time difference is longer than the downtime of the truck in the first period and if the downtime of the further truck is greater than the difference of the determined time difference and the downtime of the truck (101 ) in the first period, wherein the control signal is arranged to set the limit speed as the speed limit of the truck (101). Control system (104) after Claim 15 in which the control system (104) is set up to allocate an additional travel time to the further industrial truck (101) which corresponds to the difference of the determined time difference and the downtime of the industrial truck (101) in the first period when the control signal to the industrial truck (101) has been transmitted, although the determined time difference is longer than the downtime of the truck (101) in the first period.

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