EP0799515A1 - Circuiterie et procede de fonctionnement d'un mecanisme de commande de reglage - Google Patents

Circuiterie et procede de fonctionnement d'un mecanisme de commande de reglage

Info

Publication number
EP0799515A1
EP0799515A1 EP95936986A EP95936986A EP0799515A1 EP 0799515 A1 EP0799515 A1 EP 0799515A1 EP 95936986 A EP95936986 A EP 95936986A EP 95936986 A EP95936986 A EP 95936986A EP 0799515 A1 EP0799515 A1 EP 0799515A1
Authority
EP
European Patent Office
Prior art keywords
circuit arrangement
power
adjustment
electric motor
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP95936986A
Other languages
German (de)
English (en)
Inventor
Cornelius Peter
Gerhard Knecht
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0799515A1 publication Critical patent/EP0799515A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0851—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load for motors actuating a movable member between two end positions, e.g. detecting an end position or obstruction by overload signal
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/44—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to the rate of change of electrical quantities
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/093—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against increase beyond, or decrease below, a predetermined level of rotational speed

Definitions

  • the invention is based on a circuit arrangement and a method for operating an adjusting drive driven by an electric motor according to the type of the independent claims.
  • a control circuit for a window regulator of a motor vehicle is known from DE-OS 29 02 683, which takes into account the determination of the current flowing through the electric motor of the adjustment drive when determining an overload signal.
  • the motor current is a parameter of the adjustment drive, which specifies a measure for a force or a torque occurring in the adjustment drive.
  • the adjustment path is divided into two areas. In a first area, the detected motor current is used to set a limit value, the exceeding of which leads to the triggering of the overload signal in the second area.
  • the overload signal protects the electric motor from thermal overload and, on the other hand, ensures protection against jamming.
  • the electrical drive power of the electric motor is to be determined in such a way that the adjustment force or the adjustment torque required for the adjustment drive can be applied.
  • the pinch protection ensures that the pinching force on a Object or body parts of people acts, is limited to a predetermined value.
  • Another variable in a pinching process is the spring rate, which indicates the change in force or the change in torque in relation to the distance traveled during the pinching process until the overload signal is triggered.
  • the invention is based on the object of specifying a circuit arrangement and a method for operating an adjusting drive which is driven by an electric motor, which enable reliable operation and meet a high safety requirement.
  • the circuit arrangement according to the invention has the advantage that the adjusting drive at least enables a predetermined spring rate to be maintained.
  • the electric motor present in an adjusting drive is usually connected directly to the connections of an energy source, for example via relays.
  • the electric motor receives the full electrical power that is within a specified range due to the electrical characteristics of the electric motor.
  • the electrical power made available to the electric motor is fixed to a value which enables compliance with a predetermined spring rate.
  • the specified spring rates can be made possible with existing adjusting drives, in which case the power supplied to the electric motor has to be reduced in relation to the theoretically maximum power.
  • the determination of the electrical power takes into account the reaction capacity of the adjustment drive, which is determined in particular by the stored kinetic energy both in the electric motor and in the drive and in the part to be adjusted.
  • the overload signal can be used to switch off the electric motor.
  • the overload signal preferably causes the electric motor to reverse. If necessary, a distinction is made between switching off and reversing depending on the position of the part to be adjusted.
  • a particularly advantageous development provides that the power made available to the electric motor is predetermined as a function of a position of the part to be adjusted by the adjusting drive.
  • the amount of the benefit is determined experimentally in particular.
  • the position-related determination of the electrical power enables the adjustment drive to move the part to be adjusted a high adjustment speed for positions in which it is possible to maintain the specified spring rate without reducing the power compared to the full power.
  • the electrical power of the electric motor can be varied continuously with a power specification signal depending on the position of the part to be adjusted.
  • An advantageous measure provides that at least two discrete power levels are specified with the power specification signal.
  • adjustment range of the part to be adjusted is divided into several position ranges.
  • a power specification in particular a power reduction of the electric motor, is only provided in specified areas.
  • the measure of the division of the area in connection with the specification of at least two discrete power levels has the advantage of being easy to implement.
  • a measure of the adjusting force or the adjusting torque of the adjusting drive is, for example, the current flowing through the electric motor, which is preferably derived from the motor current ripple.
  • Another measure of the adjusting force or the adjusting torque is a speed occurring in the adjusting drive, which is also preferably derived from the motor current ripple.
  • the reduction of the electrical power made available to the electric motor at predetermined positions or position ranges compared to other positions or position ranges in which no reduction is provided is preferably determined experimentally and preferably takes into account operating data of the adjusting drive.
  • the power made available to the electric motor can be set to an experimentally determined value of, for example, 40%.
  • the power made available to the electric motor is to be limited to 60% of the full power, in order likewise to reach a speed level of 1,000 rpm.
  • a speed level of 1,000 rpm enables the specified spring rate to be maintained.
  • a simple implementation of the operation with reduced electrical power is possible with a clocked operation of a semiconductor power component through which the motor current flows.
  • the semiconductor power component In clocked operation, the semiconductor power component is completely switched on and off with a variable frequency and / or with a variable duty cycle.
  • the semiconductor power component thus acts like a voltage source which allows an average current flowing through the electric motor.
  • the use of the semiconductor power component for example a power field effect transistor, enables simple and inexpensive detection of both the motor current and a speed.
  • the voltage drop occurring at the semiconductor power component, which occurs as a result of the current flow, is evaluated.
  • the determination of the measure for the adjusting force or the adjusting torque from, for example, the motor current and / or from the speed can be done in a wide variety of ways and Way.
  • a comparison of the motor current or the rotational speed with a fixed predetermined limit value is suitable, for example.
  • the limit value is expediently determined in an adaptation process, for example the course of the measure for the adjusting force or the
  • Adjustment torque from a previous adjustment process is taken into account.
  • the evaluations of changes in, for example, the motor current or the speed, which are also taken into account where appropriate, are particularly suitable. With the changes, both temporal and location-related changes can be evaluated.
  • the method according to the invention for operating the adjustment device is particularly suitable for mastering a hard pinching process.
  • the method according to the invention makes use of the device features of the adjusting drive, which determine the characteristic values for the measure of the adjusting force or the adjusting torque, determine the position for the position of the part to be adjusted and the performance specifications for determining the electrical power of the electric motor affect.
  • the method according to the invention provides that a continuous increase in the determined dimension for the adjusting force or the adjusting torque in relation to successive path intervals, into which the adjusting path of the part to be adjusted is divided, is to be regarded as a limit value exceeding which Triggering the overload signal leads.
  • the division of the adjustment path of the part to be adjusted can, for example, be carried out directly from the position signal provided by the position determination, which is divided into predetermined intervals.
  • the path interval is preferably derived from the ripple of the motor current.
  • the distances between the individual shafts also provide a measure of the path interval.
  • the circuit arrangement according to the invention and the method are suitable for use in actuators, which are preferably arranged in a motor vehicle.
  • the motors used there are used today to the limit of their load capacity.
  • the reliability in the detection of an overload condition and a fast reaction in a pinching process are therefore particularly important in this use.
  • FIG. 1 A block diagram of an inventive circuit arrangement for operating an adjustment drive is shown in the figure.
  • the figure shows an electric motor 10, which drives a part 12 to be adjusted via a mechanical coupling 11.
  • the part 12 to be adjusted can assume different positions PM, which are indicated in the figure by a position scale 13.
  • the adjustment path of the part 12 to be adjusted is limited by end stops 14, 15 and is divided into three position ranges P 1, P B , P in the exemplary embodiment shown. Regardless of the division into the individual positions sition areas P A , P ß , P s the entire adjustment path is divided into path intervals I. Such a path interval I is entered enlarged in the figure within the range P ß .
  • the electric motor 10 can be connected via a first and second changeover switch 16, 17 to a first and second connection 18, 19 of an energy source (not shown in more detail).
  • the first changeover switch 16 connects a first motor connection 20 either to the first or the second connection 18, 19.
  • the second changeover switch 17 also connects a second motor connection 21 either to the first or second connection 18, 19.
  • a switching element 23, on which a voltage drop U occurs, is arranged in a line 22 leading from the changeover switches 16, 17 to the second connection 19.
  • the two changeover switches 16, 17 are actuated by control signals 24, 25 which are emitted by a selection circuit 26 which is contained in a control arrangement 27.
  • the selection circuit also outputs a direction of rotation signal 28 to a position determination 29.
  • the switching element 23 is actuated by a switching signal 30 which provides a power specification 31 contained in the control arrangement 27.
  • the selection circuit 26 contained in the control arrangement 27 and the power specification 31 are acted upon by a positioning signal 32 supplied to the control arrangement 27.
  • a tap 33 on the line 22 leading from the changeover switches 16, 17 to the switching element 23 is connected both to a speed determination 34 and to a motor current evaluation 35. Between tap 33 and speed determination 34 a capacitor 36 and a signal processor 37 are connected in series.
  • the speed determination 34 outputs an output signal 38 to a speed comparator 39 which compares the output signal 38 with a speed limit value 40 and outputs a first overload signal 41 when the limit value is exceeded.
  • the output signal 38 of the speed determination 34 is further supplied to the power input 31.
  • the motor current evaluation 35 outputs as an output signal a parameter 42 determined from the motor current to a parameter comparator 43 which compares the parameter 42 with a parameter limit value 44 and emits a second overload signal 45 when a limit value is exceeded.
  • a ripple signal 46 which provides signal conditioning 37, is fed to speed determination 34.
  • the ripple W on which the ripple signal 46 is based is shown schematically in the signal conditioning unit 37.
  • the distance I 'between the shafts represents a measure of a certain adjustment path of the part 12 to be adjusted.
  • the distance I 'can correspond to the path interval I.
  • the ripple signal 46 is also fed to the position determination 29.
  • the position determination 29 outputs the position signal Pg as a measure of the position P M of the part 12 to be adjusted.
  • the position signal P ⁇ is fed to a position comparator 47 and to the motor current evaluation 35 and influences the limit values 40, 44.
  • the position comparator 47 compares the position signal Pg with predetermined position ranges Pv and outputs a power specification signal 48 to the power specifications 31.
  • the electric motor 10 and the mechanical coupling 11 are part of the adjustment drive 10, 11, 12, which is provided in order to bring the part 12 to be adjusted into different positions P M.
  • the adjustment path limited by the end stops 14, 15 is divided into three position ranges P A , P B , P Q.
  • the path interval I provides a much finer division than the position ranges P A , P B , P Q.
  • the entire adjustment path can be divided into many such, preferably equally large, travel intervals I.
  • the mechanical coupling 11 corresponds, for example, to a gearbox and a transfer device, which produces a reciprocating movement from a rotary movement.
  • the electric motor 10 can be operated in both directions of rotation. The directions of rotation are specified via a corresponding control of the two changeover switches 16, 17, which connect the two motor connections 20, 21 to the two connections 18, 19 of the energy source (not shown in more detail).
  • the switch positions of the changeover switches 16, 17 are determined by the selection circuit 26 contained in the control arrangement 27 as a function of the positioning signal 32 and communicated to the two changeover switches 16, 17 via the control signals 24, 25.
  • the positioning signal 32 can contain, for example, an open-close command, a left-turn-right-turn command or a command via a continuous position specification.
  • the embodiment shown in the figure is based on a controller in which the control arrangement 27 does not contain any feedback about the position P M of the part 12 to be adjusted. The expansion to a Po Position control is possible by returning the position signal P E to the control arrangement 27.
  • the two directions of rotation of the electric motor 10 result from polarity reversal via the changeover switches 16, 17.
  • Rotation of the electric motor 10 in one direction is achieved by connecting the first motor connection 20 via the first Changeover switch 16 with the first connection 18 of the energy source and connection of the second motor connection 21 via the second changeover switch 17 to the second connection 19 of the energy source.
  • the changeover switches 16, 17 are switched to the respective other positions by means of the control signals 24, 25, so that the first motor connection 20 via the first changeover switch 16 with the second connection 19 of the energy source and the second motor connection 21 are connected via the second switch 17 to the first connection 18 of the energy source.
  • the electric motor 10 can be stopped by connecting both motor connections 20, 21 to either the first connection 18 or the second connection 19 of the energy source. The electric motor 10 is then short-circuited in each case. It is also possible to switch off the electric motor 10 in that at least one of the two changeover switches 16, 17 has a further switching contact which does not lead to either the first or the second connection 18, 19 of the energy source. Regardless of the position of the changeover switches 16, 17, the electric motor 10 can be switched on and off via the switching element 23.
  • the switching element 23 therefore offers a further possibility of switching off the electric motor 10, regardless of the position of the changeover switches 16, 17.
  • the switching element 23 is switched on and off by the switching signal 30, which first defines the performance specifications 31 contained in the control arrangement 27 as a function of the positioning signal 32.
  • the switching element 23 is, for example, a semiconductor power component, preferably a transistor, which is implemented, for example, as a power MOSFET.
  • Switching element 23 can be provided by means of the switching signal 30, in which the switching element 23 is switched on and off in rapid succession in order to preselect an average motor current.
  • the specification of the average current through the electric motor 10 is by varying the
  • the clock frequency and possibly the duty cycle are preferably determined as a function of the inductance of the electric motor 10.
  • the establishment of electromagnetic interference radiation, which can largely be avoided, is preferably also taken into account in the determination.
  • An overload state of the adjustment drive 10, 11, 12 occurs, for example, when it is stiff, when a mechanical end stop is reached or when it is jammed
  • Such an overload condition is detected, for example, by evaluating the current flowing through the electric motor 10.
  • the current flowing through the electric motor 10 is at least approximately a measure of the torque provided by the electric motor 10.
  • An increase in accuracy is possible, for example, by detecting the temperature of the electric motor 10, which can be used to correct the motor current.
  • the current flowing through the electric motor 10 is therefore also a measure of the adjusting force or for the adjustment torque with which the part 12 to be adjusted is moved.
  • Another possibility for detecting an overload condition uses a speed or a speed that occurs in the adjusting drive 10, 11, 12.
  • the determined speed is also a measure of the adjusting force or the adjusting torque with which the part 12 to be adjusted is moved.
  • Sensors which detect the magnetic field accompanying the current are particularly suitable for detecting the motor current.
  • Such sensors are, for example, Hall effect sensors, magnetoresistive elements or inductive sensors.
  • the advantage of these sensors is that no intervention in the current-carrying lines is necessary.
  • a current sensor is shown, which provides a signal voltage representative of the motor current due to a voltage drop occurring at a resistor.
  • One such sensor is, for example, an ohmic resistance, which should have a low value in view of the high motor current.
  • the exemplary embodiment is based on the detection of the voltage drop U that occurs at the switching element 23. This current detection has the advantage that a separate sensor can be omitted.
  • the switching element 23 is preferably a power MOSFET with a low resistance in the on state.
  • the relationship between the voltage drop U and the current flowing through the field effect transistor is sufficiently linear for the intended application. If necessary, an electronic equalization can be carried out.
  • the voltage drop U is coupled out at the tap 33 from the line 22 and fed to both the motor current evaluation 35 and the speed determination 34.
  • the motor current evaluation 35 determines a parameter of the motor current, wherein for example the absolute level of the motor current and / or the temporal change in the motor current and / or the location-related change in the motor current can be taken into account. If necessary, an addition from the absolute motor current level to one of the change values determined can be provided. When determining the changes, both the first and higher derivatives, either according to the time or according to the location, can be taken into account.
  • the parameter 42 determined in the motor current evaluation 35 is compared in the parameter comparator 43 with the parameter limit value 44.
  • the characteristic variable limit value 44 can be, for example, a fixed, predetermined number.
  • the parameter limit value 44 preferably depends on the electrical voltage of the energy source, not shown in the figure, to which the electric motor 10 can be connected via the two connections 18, 19. Furthermore, the parameter limit value 44 preferably depends on the position P ⁇ of the part 12 to be adjusted.
  • Influencing takes place via the position signal Pg.
  • positions P j v j or position ranges P A , P B , P Q of the part 12 to be adjusted, which may require an increased actuating force, are taken into account when determining the characteristic value limit value 44 . If the threshold 43 is exceeded in the sense of the parameter 42 exceeding the parameter 42, the parameter comparator 43 emits the second overload signal 45.
  • the speed determination 34 determines a speed of the actuating drive 10, 11, 12 in the exemplary embodiment shown from the ripple W of the motor current.
  • the ripple W in the motor current is caused by commutation processes in the electric motor 10 and therefore depends on the design of the electric motor 10.
  • the number of waves during one Rotation of the electric motor 10 is determined by design.
  • the evaluation of the ripple W of the motor current is prepared in the signal conditioning unit 37.
  • the capacitor 36 entered in the signal flow direction before the signal conditioning unit 37 expresses that only the alternating components of the voltage drop U occurring at the tap 33 are required.
  • the signal processor 37 contains, for example, an amplifier circuit and preferably signal filter circuits which free the ripple of the motor current from superimposed higher-frequency and lower-frequency signal components.
  • the signal conditioning unit 37 preferably contains a signal conversion which, from the sinusoidal curve of the motor current, provides a rectangular signal that is well suited for further signal processing.
  • the rectangular signal which appears as a ripple signal 46, can be evaluated in the speed determination 34 by a time determination between the level changes and converted into the output signal 38, which is a measure of a speed that has occurred in the adjusting drive 10, 11, 12.
  • the output signal 38 is likewise a measure of the speed of the part 12 to be adjusted or of another part within the adjusting drive 10, 11, 12.
  • the speed-related values are therefore also speed-related values.
  • the output signal 38 is compared in the speed comparator 33 with the speed limit value 40.
  • the speed limit value 40 can be a fixed predetermined number or preferably a value that depends on other variables.
  • a dependency on the position P M of the part 12 to be adjusted is preferably provided via the position signal Pg. With a limit value
  • the speed comparator 39 emits the first overload signal 41 in the sense of a shortfall.
  • the first and / or second overload signal 41, 45 can be used in different ways.
  • the electric motor 10 is preferably switched off.
  • Another measure which can be provided, for example, as a function of the position P M of the part 12 to be adjusted, provides for the direction of rotation of the electric motor 10 to be reversed. Reversing, which can be limited to a specified time or to a specified adjustment path, releases, for example, trapped objects or body parts of people.
  • the first and / or overload signal 41, 45 is to be connected to the control arrangement 27 in the exemplary embodiment shown in order to carry out this task.
  • the corresponding control signals 24, 25 and the switching signal 30 are defined.
  • limit values 40, 44 which may depend on other variables such as the operating voltage or the position P ⁇ of the part 12 to be adjusted or a temperature, make it possible to limit the adjusting force or the adjusting torque.
  • Different algorithms in the motor current evaluation 35 when determining the dimension 42 or in the speed determination 34 when determining the output signal 38 enable the detection of different pinching processes. If necessary, a plurality of comparators 39, 43 must be provided at the same time, each operating with different limit values 40, 44. These measures make it possible to distinguish between soft and hard pinching processes.
  • a soft clamping process in which the part 12 to be adjusted can travel a comparatively large adjustment distance until a A predetermined maximum pinching force can generally be mastered without any problems since there is sufficient time available to switch off the electric motor 10 or to reverse the direction of rotation after the soft pinching process has been detected. It is more difficult to master hard pinching processes in which the pinching force must be reduced to the maximum permitted value within a comparatively short adjustment path.
  • a high spring rate which indicates the change in force on the adjustment path covered until one of the overload signals 41, 45 occurs, must therefore be realizable to master a hard pinching process.
  • the measure provided according to the invention the fixing of the electrical power available to the electric motor 10 of the adjustment drive 10, 11, 12 to a predetermined value, which is preferably position-dependent, enables a predetermined spring rate to be maintained.
  • Existing adjusting drives 10, 11, 12, which do not make it possible to maintain the specified spring rate can continue to be used with the measure provided according to the invention after, for example, compliance with legal regulations.
  • If the power is determined independently of the position of the part 12 to be adjusted, a reduction in the adjustment speed may have to be accepted.
  • the power specified for the electric motor 10 is preferably dependent on the position of the part to be adjusted, with a division into different areas P A , P ⁇ , P 1 preferably also being provided.
  • the adjusting drive 10, 11, 12 can then operate at the full adjustment speed in the positions or in the position ranges P A , P ⁇ , P 1, in which no power reduction is provided.
  • the value to which the power for the electric motor 10 is to be determined is preferably determined experimentally. at Changes in output in the sense of a reduction depend preferably on the operating data of the adjustment drive 10, 11, 12. Such operating data are, for example, the power consumed by the electric motor 10, which is actually consumed at the maximum power available, and the motor current or preferably the speed. For example, in a position range P A , P ß , P c there is a speed level of 3,000 rpm and in a subsequent position range P, P ß , P ⁇ the speed should be reduced to a level of 1,000 rpm, for example , the electrical power provided for the electric motor 10 is set to an experimentally determined value of, for example, 40% compared to the full power.
  • the power reduction can be lower and is, for example, ascertained 60% of the full power in order to likewise reduce the speed level to 1,000 rpm.
  • the power specification 31 carries out the determination of the power by a corresponding determination of the switching signal 30.
  • the power input 31 is supplied with the output signal 38 determined by the speed determination 34.
  • the power specification 31 receives the position-dependent power specification signal 48, which the position comparator 47 outputs.
  • an incremental position determination is provided.
  • the incremental position determination can use additional position sensors such as Hall elements.
  • the evaluation of the ripple W of the motor current is provided in any case in the exemplary embodiment, so that in the present exemplary embodiment the position P 1 is to be determined from the ripple W of the motor current.
  • the ripple signal 46 is therefore fed to the position determination 29, which has a forward Contains backward counter that counts the number of individual waves.
  • the position determination 29 receives the information about the drive direction via the direction of rotation signal 28.
  • a calibration in the position determination 29 can be carried out by means of a reference mark, not shown in the figure, which is arranged within the adjustment drive 10, 11, 12 or on the part 12 to be adjusted.
  • Another calibration option is given by moving to a predetermined position P M and setting the counter in position determination 29 accordingly.
  • the part 12 to be adjusted can be moved on the one mechanical end stops 14, 15, the reaching of which is indicated by the occurrence of at least one overload signal 41, 45.
  • the counter contained in the position determination 29 can be set to the counter reading zero, for example.
  • the position determination 29 outputs the position P M of the part 12 to be adjusted as a position signal P B.
  • the adjustment path of the part 12 to be adjusted is preferably divided into a plurality of position ranges P A , P ⁇ , P Q.
  • the position ranges Py specified for the position comparator 47 can correspond to the position ranges P A , P ⁇ , P c . For example, it is provided that within the position range P B , within which none of the end stops
  • the power is determined with the switching signal 30, which effects a clocked operation of the switching element 23.
  • the switching element 23 is switched on and off in rapid succession in order to specify an average motor current.
  • the clock frequency and / or the duty cycle are determined as a function of the positive tion-dependent power specification signal 48 and / or as a function of operating data of the adjustment drive 10, 11, 12, of which the speed determined by the speed determination 34 is provided in the figure, for example.
  • the power specification 31 contains, for example, an analog circuit which determines the corresponding switching signal 30 from these supplied signals.
  • a digital circuit implementation is preferably provided, the functional relationships being stored in tabular form. Both a table for a position-dependent value and at least one table for values dependent on other operating data can therefore be provided.
  • the method according to the invention which is particularly suitable for controlling hard pinching processes, provides for a continuous change in a parameter, based on successive travel intervals I, to trigger one of the overload signals 41, 45.
  • a continuous motor current increase in the motor current evaluation can take place as a function of the position signal Pg supplied to the motor current evaluation 35.
  • the path intervals I can be determined from the position signal P E on the basis of the determined change in position. An increase in the motor current ascertained in the parameter comparator 43 within a predetermined number of successive path intervals I leads to the triggering of the second overload signal 45. Another possibility is offered by evaluating the motor current ripple in the signal conditioning system 37. The determination of the individual path intervals I can omitted here since the position information is contained in the ripple W. The distance I 'of the individual shafts is directly a measure of the individual travel intervals I of the part 12 to be adjusted. Depending on the implementation of the entire adjustment drive 10, 11, 12, the stood I 1 from wave to wave at least approximately the predetermined path interval I, which must be set to a specific value in order to achieve a predetermined position resolution.
  • the path interval I and the distance I ' are to be set to a correspondingly small value, in particular in order to achieve a minimum predetermined spring rate.
  • the speed determination 34 determines the times between the successive distances I 'from the ripple signal 46. In the case of a continuous increase in the times required for the individual distances I' in relation to a predetermined number of distances I ', the speed comparator 39 gives the result most overload signal 41 out. If necessary, averaging over several distances I 'may be necessary, for example to compensate for a phase jitter.
  • the method according to the invention for operating the adjustment drive 10, 11, 12 is to be seen in connection with the determination, in particular reduction of the electrical drive power, which is provided according to the invention and which is made available to the electric motor 10.

Landscapes

  • Control Of Electric Motors In General (AREA)
  • Vehicle Body Suspensions (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)

Abstract

L'invention concerne une circuiterie et un procédé de fonctionnement d'un mécanisme de commande de réglage (10, 11, 12), permettant de détecter un paramètre (38; 42) du mécanisme de commande de réglage (10, 11, 12) servant de mesure pour la force ou le couple de réglage, et d'émettre un signal de surcharge (41, 45) en cas de dépassement d'une valeur limite. Selon l'invention, il est prévu de caler la puissance électrique du moteur électrique (10) sur une valeur permettant de maintenir la constante d'élasticité lors d'un processus de serrage, ce qui entraîne une variation de force liée à une modification de course. La course de réglage de la partie (12) à régler est divisée en intervalles (I) considérablement plus petits comparativement à l'ensemble de la course de réglage. Le procédé évalue une variation continue des paramètres détectés dans un nombre prédéterminé d'intervalles (I) successifs, afin de déterminer un signal de surcharge (41, 45). Cette circuiterie et ce procédé s'utilisent de préférence dans une automobile, pour actionner un mécanisme de commande de réglage (10, 11, 12).
EP95936986A 1994-12-19 1995-11-25 Circuiterie et procede de fonctionnement d'un mecanisme de commande de reglage Ceased EP0799515A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4444762 1994-12-19
DE4444762A DE4444762A1 (de) 1994-12-19 1994-12-19 Schaltungsanordnung und Verfahren zum Betreiben eines Verstellantriebs
PCT/DE1995/001672 WO1996019858A1 (fr) 1994-12-19 1995-11-25 Circuiterie et procede de fonctionnement d'un mecanisme de commande de reglage

Publications (1)

Publication Number Publication Date
EP0799515A1 true EP0799515A1 (fr) 1997-10-08

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EP95936986A Ceased EP0799515A1 (fr) 1994-12-19 1995-11-25 Circuiterie et procede de fonctionnement d'un mecanisme de commande de reglage

Country Status (7)

Country Link
US (1) US5963001A (fr)
EP (1) EP0799515A1 (fr)
JP (1) JPH10510978A (fr)
KR (1) KR980700717A (fr)
CN (1) CN1170480A (fr)
DE (1) DE4444762A1 (fr)
WO (1) WO1996019858A1 (fr)

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Also Published As

Publication number Publication date
DE4444762A1 (de) 1996-06-20
KR980700717A (ko) 1998-03-30
WO1996019858A1 (fr) 1996-06-27
JPH10510978A (ja) 1998-10-20
US5963001A (en) 1999-10-05
CN1170480A (zh) 1998-01-14

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