Abstract:
An electronic device for controlling and/or regulating a drive unit includes a memory configured to make available at least two at least partially different control parameter sets which are each usable to at least one of control and regulate one of at least two drive units. The electronic device further includes a control unit which is configured to select one of the at least two parameter sets of the memory unit as a function of at least one operating parameter of the drive unit.

Description:
This application claims priority under 35 U.S.C. §119 to patent application no. DE 10 2013 210 926.1, filed on Jun. 12, 2013 in Germany, the disclosure of which is incorporated herein by reference in its entirety. 
     BACKGROUND 
     Electronic devices have already been proposed. Today, digital rotation speed counters are supplied with a fixed parameter set. Products with different motors require different parameter sets. Therefore a high variance of electronic devices is required. 
     SUMMARY 
     An electronic device is proposed, in particular a hand machine-tool electronic device, which is provided for control and/or regulation of a drive unit, with a memory unit which is provided for making available at least two at least partially different control parameter sets which are each provided for control and/or regulation of one of at least two drive units, and with a control unit which is provided for selection of one of the at least two parameter sets of the memory unit as a function of at least one operating parameter of the drive unit. The memory unit is preferably formed integrally with the control unit, and the electronic device is preferably provided as a complete assembly to be installed in a hand machine-tool. It is however also conceivable that the memory unit is formed by an external assembly such as for example a Notebook, a Netbook, a tablet, an external hard disk unit or another external device which appears suitable to a person skilled in the art, and is configured to be able to be coupled releasably to the control unit. The term “control and/or regulation” in this context means in particular a targeted adaptation of at least one adjustable operating parameter of the drive unit, such as in particular a rotation speed, a torque and/or another operating parameter which appears suitable to a person skilled in the art. The drive unit is preferably formed at least partly by an electric motor, in particular a universal motor. However also other embodiments of the drive unit appearing suitable to a person skilled in the art are conceivable. 
     The term “at least partially different” in this context means in particular that at least one control parameter of the at least two control parameter sets each has a value which in particular differs by at least 1%, preferably by at least 2%, preferably by at least 5%, and particularly preferably by at least 10% of the greater value in terms of amount. The term “control parameter set” in this context means in particular a group of at least two different control parameters which are each provided for regulation and/or control of at least one function of the hand machine-tool in which the electronic device is incorporated, wherein the control parameters of the control parameter set are matched at least partially to each other and in particular to a design and/or a preferred operating mode of the hand machine-tool. In a particularly preferred exemplary embodiment, the control parameters of the control parameter set are formed respectively by a voltage, a current intensity, an electrical resistance, and/or another control parameter which appears suitable to a person skilled in the art. 
     The term “as a function of” in this context means in particular caused by and/or determined by and/or decisively influenced by something. The term “operating parameter” in this context in particular means a preferably constant value which can be in particular uniquely associated with the drive unit and which occurs at least in one operating state of the drive unit. Preferably the operating parameter of the drive unit is proposed and/or defined at an idle of the drive unit in which at least substantially no load is present on the drive unit in an operating state. The at least one operating parameter is at least partially formed by a value which is at least partially dependent on the drive unit, at least substantially constant and/or at least partially configured characteristically for the drive unit. 
     The embodiment according to the disclosure achieves a flexibly and universally applicable, and hence economic electronic device which is provided for control and/or regulation of different drive units and therefore can be installed with different hand machine-tools. Thus a preferably low variance of electronic units for different hand machine-tools can be achieved. 
     It is furthermore proposed that the at least one operating parameter of the drive unit comprises an ignition point and/or an ignition angle. The term “ignition point” in this context means in particular a time in an operating state of the drive unit at which in particular a triac provided for control of the drive unit is connected, and at which an alternating drive voltage controlled in particular by means of the triac shows a jump-like rise in an amount of the value. The term “ignition angle” in this context in particular means a phase angle between the neutral passage of the network alternating voltage and the ignition point, in particular when a control alternating voltage is present at a gate of the triac. It is however also conceivable that the at least one operating parameter of the drive unit alternatively or additionally comprises a rotation speed, a pulse width modulation, a duty cycle and/or other operating parameter appearing suitable to a person skilled in the art, which in particular uniquely characterize the drive unit. Thus a preferably simple and advantageously reliable detection of the operating parameter and selection of the appropriate control parameter set can be achieved. 
     Furthermore it is proposed that the control parameter sets are provided in an operating state for rotation speed control of the drive unit. The term “rotation speed control” in this context means in particular a control and/or regulation of the rotation frequency of a rotatably mounted part of the drive unit in one operating state of the drive unit. Hence an advantageous adjustment to a desired operating case can be achieved. 
     It is also proposed that the control unit comprises at least one memory element which is provided for permanently storing the at least one selected control parameter set and making this available for control and/or regulation of the drive unit. The term “store” in this context means in particular the storage of at least one datum, in particular independently of a power supply, preferably in an electronic memory. Thus in an advantageously simple and reliable way, the appropriate control parameter set can be made available in an operating state. 
     Furthermore a hand machine-tool is proposed with a drive unit and with an electronic device according to the disclosure. Thus a preferably adaptable embodiment of the hand machine-tool can be achieved. 
     It is also proposed that the drive unit is formed at least partially by an electric motor. Preferably the electric motor is formed by a universal motor. However other embodiments of the electric motor are conceivable which appear suitable to a person skilled in the art. In this way a structurally simple, user-friendly embodiment of the hand machine-tool can be achieved. 
     Furthermore a system is proposed with at least two substantially different hand machine-tools according to the disclosure, which each comprise an electronic device according to the disclosure. The different hand machine- tools may be formed by angle grinders of different sizes, screwdrivers, drills and/or impact drills, drilling and/or impact hammers, and/or other hand machine-tools which appear suitable to the person skilled in the art. In this way an advantageously low variance of the electronic devices for different hand machine-tools can be achieved. 
     Furthermore the disclosure is based on a method for control and/or regulation of the drive unit of a hand machine-tool according to the disclosure by means of an electronic device according to the disclosure. In this way, a preferably reliable and advantageously precise control and/or regulation of the drive unit can be achieved. 
     It is also proposed that the method comprises at least one method step in which an operating parameter of the drive unit in an operating state is detected, and at least one further method step in which a control unit selects one of the at least two control parameter sets as a function of the at least one operating parameter of the drive unit. Preferably the suitable control parameter set is selected on first operation of the hand machine-tool. In this way, a preferably simple embodiment can be achieved. 
     It is also proposed that the method comprises at least one further method step in which the one selected control parameter set is permanently stored in a memory element of the control unit. 
     Preferably, on each operation following the first operation, the control unit retrieves the control parameter set stored in the memory element. In this way, an advantageously reliable and structurally simple embodiment can be achieved. 
     It is furthermore proposed that the method comprises at least one further method step in which the drive unit is at least partially controlled and/or regulated by the control unit as a function of the one selected control parameter set. In this way, an advantageously reliable and preferably precise operation of the hand machine-tool can be achieved. 
     It is also proposed that in the at least one further method step, at least one rotation speed of the drive unit is at least partially controlled and/or regulated by the control unit as a function of the one selected control parameter set. The term “rotation speed” in this context means in particular a rotation frequency of a rotatably mounted part of the drive unit in an operating state of the drive unit. In this way, an advantageous adaptation of the drive unit to a desired operating case can be achieved. 
     The electronic device according to the disclosure is not restricted to the application and embodiment described above. In particular, the electronic device according to the disclosure, in order to fulfill a function described herein, may comprise a number of individual elements, components and units which differs from the number cited herein. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Further advantages arise from the drawing description below. The drawing depicts an exemplary embodiment of the disclosure. The drawing, description and claims contain numerous features in combination. The person skilled in the art will also consider the features individually where suitable and combine these into further sensible combinations. 
       In the drawings: 
         FIG. 1  shows a hand machine-tool according to the disclosure with an electronic device according to the disclosure, in a diagrammatic top view, 
         FIG. 2  shows a block circuit diagram of a method according to the disclosure for control and/or regulation of a drive unit of the hand machine-tool according to the disclosure by means of the electronic device, and 
         FIG. 3  shows a voltage development in the hand machine-tool according to the disclosure in an operating state, in a diagram. 
     
    
    
     DETAILED DESCRIPTION 
       FIG. 1  shows a hand machine-tool  20 . The hand machine-tool  20  is formed by an angle grinder. However other embodiments of the hand machine-tool  20  which appear suitable to a person skilled in the art are conceivable, such as for example an electric drill, a hammer drill, an oscillation hand machine-tool or an orbital sander. The hand machine-tool  20  comprises a housing  30 . The housing  30  is made of plastic. The housing  30  forms a main handle  32  which is provided to be gripped by the hand of a user. In the main extension direction  34  of the hand machine-tool  20 , a power cable  36  is arranged at one end of the housing  30 . The power cable  36  is provided for supply of electrical energy to the drive unit  12  of the hand machine-tool  20  via a power pack. The power cable  36  is provided to be connected to an electrical power network. For this the power cable  36  has a plug element (not shown). It is however also conceivable that the hand machine-tool  20  is formed by a battery-powered hand machine-tool. The hand machine-tool  20  furthermore has a switch element  38  which is designed to be operated by a user. The switch element  38  is provided for activating the drive unit  12 . The switch element  38  is formed by a switch trigger. 
     The hand machine-tool  20  furthermore has a gear casing  40 . The gear casing  40  is connected to the housing  30  at an end of the housing  30  opposite the power cable  36 . The gear casing  40  is made of metal. The gear casing  40  is made of aluminum. The hand machine-tool  20  comprises a tool holder (not shown in more detail) which is provided to receive an insert tool  42  and hold this captively. The insert tool  42  is formed by a sanding disk. The insert tool  42  is releasably connected to the tool holder. The tool holder, viewed vertically to the main extension direction  34  of the hand machine-tool  20 , is arranged at an open end of the gear casing  40 . The tool holder protrudes out of the gear casing  40 . Also a protective hood  44  is coupled to a flange of the gear casing  40 . The protective hood  44  is releasably connected to the hand machine-tool  20 . 
     The hand machine-tool  20  also has an additional handle  46 . The additional handle  46  is provided to be gripped by a further hand of the user. The additional handle  46  is releasably coupled to the hand machine-tool  20 . In the state wherein the additional handle  46  is mounted on the hand machine-tool  20 , a main extension direction  48  of the additional handle  46  runs vertically to the main extension direction  34  of the hand machine-tool  20  and parallel to a main extension plane of the insert tool  42 . 
     The hand machine-tool comprises the drive unit  12  and an electronic device  10  which is provided for control or regulation of the drive unit  12 . The housing  30  of the hand machine-tool  20  surrounds the drive unit  12  and the electronic device  10 . The drive unit  12  comprises an electric motor. The drive unit  12  comprises a universal motor. The drive unit  12  has an output shaft (not shown) which is connected to a drive shaft via a gear unit. The gear unit has an angular gear (not shown). The drive shaft is provided for driving the insert tool  42  which is coupled to the tool holder. The drive unit  12  is actively connected to the electronic device  10 . The drive unit  12  is electronically connected to the electronic device  10 . 
     The electronic device  10  comprises a control unit  16 . The control unit  16  is provided for control or regulation of the drive unit  12 . The control unit  16  can also, alternatively or additionally, be provided for control or regulation of a further function unit appearing suitable to a person skilled in the art. The control unit  16  is provided for control or regulation of a rotation speed of the drive unit  12 . The control unit  16  forms a rotation speed control unit. The control unit  16  has a rotation speed detection unit which is provided to detect a rotation speed of the drive unit  12  in an operating state. To control the drive unit  12 , the control unit  16  comprises a bidirectional thyristor triode or a symistor (triac). The control unit  16  also comprises a microcontroller which is provided for control or regulation of the drive unit  12 . The electronic device  10  also comprises a memory unit  14 . The memory unit  14  is provided for making available several different control parameter sets which are each provided for control or regulation of one of several different drive units  12 . The memory unit  14  is provided for permanent storage of the control parameter sets. Alternatively however it is also conceivable that the memory unit  14  is provided for temporary storage of the control parameter sets. The memory unit  14  is arranged inside the hand machine-tool  20  and is configured integrated therein. Alternatively it is however also conceivable that the memory unit  14  is formed at least partially separately from the hand machine-tool and formed by an external device such as in particular a Notebook, a Netbook, a tablet, an external hard disk unit or another external device appearing suitable to a person skilled in the art. The control unit  16  of the electronic device  10  is provided for selection of one of the control parameter sets of the memory unit  14  as a function of one or more parameters of the drive unit  12 . 
     The operating parameter of the drive unit  12  is formed by an ignition point of the drive unit  12 . Alternatively or additionally, it is also conceivable that the operating parameter of the drive unit  12  is formed by an ignition angle of the drive unit  12  or by another parameter which appears suitable to a person skilled in the art and is at least partially dependent on the drive unit  12 . The operating parameter of the drive unit  12  is detected at an idle of the hand machine-tool  20  in which the drive unit  12  is set to a defined idle rotation speed. The ignition point of the drive unit  12  is defined by a time at which the bidirectional thyristor triode (triac) connects. The bidirectional thyristor triode connects when an amount of an alternating voltage U n , which runs phase-offset to the network voltage with which the hand machine-tool  20  is driven, exceeds a limit value. Thus a phase control can be achieved. As long as the amount of the follow-on alternating voltage U n  runs below the limit value, the bidirectional thyristor triode constitutes a high-ohmic resistance and blocks the network voltage. As soon as the amount of the follow-on alternating voltage U n  runs above the limit value, the bidirectional thyristor triode constitutes a low-ohmic resistance and conducts the network voltage. This gives a characteristic development of the drive alternating voltage U a  of the drive unit  12  resulting from the network voltage ( FIG. 3 ). This characteristic of the drive unit  12  is detected by the control unit  16 . Alternatively it is also conceivable that the drive alternating voltage U a  of the drive unit  12  is designed to be controllable via a microcontroller, whereby the follow-on alternating voltage U n  may be omitted. 
     The control unit  16  is electronically connected to the memory unit  14 . The memory unit  14  stores an association between the characteristic of the drive unit  12 , such as the ignition point and the associated control parameter set, and the respective control parameter sets. From the characteristic of the drive unit  12 , the control unit  16  selects the control parameter set suitable for the drive unit  12 . The selected control parameter set is provided in an operating state of the hand machine-tool  20  for rotation speed control of the drive unit  12 . The control unit  16  comprises a memory element  18  which is provided for permanent storage of the selected control parameter set provided by the memory unit  14 , and for making this available for control and/or regulation of the drive unit  12 . 
     On first operation of the hand machine-tool  20  after production and assembly of the hand machine-tool  20 , in a first method step  22 , an operating parameter of the drive unit  12  is detected by the control unit  16 , whereby the control unit  16  can detect the drive unit  12 , and in a further method step  24  the control parameter set suitable for the hand machine-tool is selected, and in a further method step  26  stored permanently in the memory element  18  of the control unit  16 . A further method step  28  is provided in which the drive unit  12  is controlled by the control unit  16  as a function of the selected control parameter set in each subsequent operating state. In the further method step  28 , the control unit  16  controls or regulates the rotation speed of the drive unit  12  as a function of the selected control parameter set.