WO2017198381A1 - Détermination de phases de roue libre d'une machine électrique couplée à un moteur à combustion interne au moyen d'une roue libre - Google Patents

Détermination de phases de roue libre d'une machine électrique couplée à un moteur à combustion interne au moyen d'une roue libre Download PDF

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Publication number
WO2017198381A1
WO2017198381A1 PCT/EP2017/057112 EP2017057112W WO2017198381A1 WO 2017198381 A1 WO2017198381 A1 WO 2017198381A1 EP 2017057112 W EP2017057112 W EP 2017057112W WO 2017198381 A1 WO2017198381 A1 WO 2017198381A1
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WO
WIPO (PCT)
Prior art keywords
speed
electric machine
combustion engine
internal combustion
rotational speed
Prior art date
Application number
PCT/EP2017/057112
Other languages
German (de)
English (en)
Inventor
Paul Mehringer
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
Priority to CN201780031360.XA priority Critical patent/CN109275352A/zh
Priority to EP17713919.3A priority patent/EP3459171A1/fr
Publication of WO2017198381A1 publication Critical patent/WO2017198381A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
    • H02P6/14—Electronic commutators
    • H02P6/16—Circuit arrangements for detecting position
    • H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
    • H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings

Definitions

  • the present invention relates to a method for determining freewheeling phases of an electric machine coupled to a freewheel to an internal combustion engine, as well as a computing unit, preferably a controller, for an electrical machine, and a computer program for its implementation.
  • electrical machines in particular externally excited electrical machines, can be used. These have a controller which regulates the excitation current of the electric machine as a function of the vehicle electrical system voltage.
  • the electric machine is coupled to the internal combustion engine with a coupling element, typically with a belt drive, wherein the coupling element is subjected to different torques both by the internal combustion engine and by the electric machine, depending on the respective operating state.
  • the electric machine may have a freewheeling element in order to reduce the abrasion of the belt drive caused by the application of torque to the electric machine or the internal combustion engine.
  • the electric machine can thus have freewheeling phases in which the freewheeling element is active and thus the electric machine is decoupled from the internal combustion engine.
  • the freewheeling element is particularly active when the rotational speed of the electric machine is greater than that of the internal combustion engine.
  • the invention relates to a method for determining freewheeling phases of an electric machine coupled to a freewheel to an internal combustion engine, and to a method for determining freewheeling phases
  • Advantageous embodiments are the subject of the dependent claims and the following description.
  • the method is used to determine freewheeling phases of a coupled to a freewheel to an internal combustion engine electric machine.
  • the determined freewheeling phases can be used in particular for determining a deceleration torque of an electric machine coupled to a freewheel to an internal combustion engine.
  • operating states of the electrical machine can also be determined by means of the method in which no free-wheeling phases are present.
  • the electric machine can be driven by the internal combustion engine, wherein the electric machine with the internal combustion engine via the freewheeling element and an engaging belt drive are coupled together. Due to the coupling between the electric machine and the internal combustion engine, depending on the operating state of the electric machine, of the Internal combustion engine torque to be transmitted to the electric machine. On the part of the electric machine, the torque of the internal combustion engine is counteracted by a deceleration moment, which should be overcome, in particular in the idling state of the internal combustion engine, so as not to impair the operation of the internal combustion engine.
  • the most accurate possible knowledge of the torque absorbed by the electric machine is generally of general interest, in particular in order to regulate accordingly a control of an internal combustion engine driving the electric machine.
  • the knowledge of this torque absorption of the electric machine is also of special interest, in particular when the internal combustion engine is in a control-critical operating condition, such as the idle state.
  • the torque absorbed by the electric machine in tips can assume very high values, the power output of the internal combustion engine or the associated torque being rather small or fluctuating, which can result in considerable speed instabilities of the internal combustion engine. In extreme cases, this can even lead to the generator 'stalling' the combustion engine with its torque, that is to say stopping the rotation of the internal combustion engine. This is due to the fact that the internal combustion engine only outputs its torque in a pulse-like manner, that is, in each case in the work cycles of the internal combustion engine. In the intermediate phases, the internal combustion engine can not control its torque.
  • a chronological progression of a phase signal of the electrical machine is detected.
  • Step is the time course of a speed, which in particular has oscillating speed oscillations, determined from the phase signal.
  • the determined rotational speed may be the rotational speed of the internal combustion engine and / or the rotational speed of the electrical machine, which are substantially identical, for example, in the case of a forced coupling between the electric machine and the internal combustion engine. It is also possible to combine both the speed signals corresponding to the electric machine and that of the internal combustion engine, wherein the speed signal of the internal combustion engine can also be obtained from an external source, such as the engine control.
  • the time profile of the rotational speed of the electric machine in this case typically has an oscillating speed oscillation, which is caused by the power strokes of the internal combustion engine and coupled by the coupling via the coupling element, according to the electric machine. It is further preferred to determine the rotational speed of the internal combustion engine on the basis of the measured values available in the electrical machine, in particular the phase signal.
  • the phase signal of the electrical machine in particular comprises at least one of the phase voltages and / or at least one of the phase currents of the electrical machine.
  • the use of the phase signal for determining the rotational speed of the electric machine is advantageous since the rotational speed can be determined directly from measured variables already available in the electrical machine, without requiring a further sensor, for example a rotational speed sensor, which requires the rotational speed of the determined electrical machine.
  • determination of the rotational speed from a plurality of phase signals may be advantageous in order to increase the accuracy of the rotational speed determination and to increase the reliable provision of the rotational speed signal.
  • the determination of the rotational speed of the electric machine and / or the internal combustion engine may also be based on a speed sensor attached to the respective machine, for example an inductive or capacitive sensor and / or on the basis of in a control unit, such as an engine control unit, existing data can be determined.
  • a speed sensor attached to the respective machine for example an inductive or capacitive sensor and / or on the basis of in a control unit, such as an engine control unit, existing data can be determined.
  • a freewheeling phase of the electric machine is determined by taking a first criterion and a second criterion, wherein the first criterion for identifying an oscillating speed oscillation in the time course of the speed is used and the second criterion for identifying a characteristic of a freewheeling phase change in speed serves.
  • the internal combustion engine gives its respective torque, due to the working cycles of the individual cylinders, impulsively to the crankshaft.
  • the frequency of the torque output is essentially determined by the current speed and the number of cylinders of the internal combustion engine, in particular a combustion engine.
  • the frequency of the pulse-like torque output is coupled into the electric machine such that these are reflected as the average speed signal superimposed oscillations.
  • Such oscillations are particularly well detectable in an idle state of the internal combustion engine.
  • Internal combustion engine in which the internal combustion engine is coupled to the drive train of the vehicle and a speed increase of the internal combustion engine - for example, on a downhill - is caused by the vehicle accelerating gravity.
  • the oscillations of the speed are damped by the onset of the freewheel. This is given in time ranges in which the speed curve of the electric machine has speed slopes with decreasing slope.
  • a freewheeling phase can be determined.
  • the first criterion as a necessary criterion for the presence of a freewheeling phase and the second criterion as a sufficient criterion for a freewheeling phase, such a freewheeling phase can be detected reliably and particularly simply.
  • the rotational speed is determined only at times in which the phase signal has an ascending and / or a falling edge.
  • a determination of the rotational speed only at times of the flanks of the phase signal is particularly advantageous, since in particular the flanks can be detected particularly easily by measurement. By including as many edges as possible in the speed detection, the resolution of the speed can be increased accordingly.
  • the number of pulses required for this purpose of the phase signal or the measurement times of the rotational speed (time stamp) results from the Nyquist theorem.
  • the respective times of the speed detection (time stamp) preferably result from a fixed potential value of the phase signal. This is a particularly simple and reproducible way to set the times of a speed detection. From the difference of the neighboring timestamp an instantaneous speed can be determined.
  • the first criterion prefferably be determined on the basis of a minimum value and a maximum value of the rotational speed, wherein preferably the absolute value of the difference between the minimum value and the maximum value is greater than a threshold value.
  • Minimum values or maximum values of the rotational speed are particularly easy to detect by measurement. By subtracting the magnitude of the minimum value and the maximum value of the rotational speed oscillations, their amplitude can be determined.
  • the threshold value can be selected according to the magnitude of the amplitude, which essentially depends on the system parameters of the internal combustion engine or the electrical machine.
  • An order of magnitude of the difference between maximum and minimum speed for a typical constellation of an internal combustion engine and an electric machine, at a speed of the generator in the middle range of the speed spectrum for a vibration is about 100 revolutions / min. Since the threshold value is dependent on the speed, it is also particularly preferred to set this dependent on the average speed of the electric machine.
  • the first criterion can be derived safely and reproducibly.
  • the second criterion is determined based on a relation between the time change of the rotational speed, in particular a temporally monotonically decreasing change in the rotational speed, and a period of oscillation of the internal combustion engine.
  • the invention is based on the finding that the oscillations of the rotational speed caused by the internal combustion engine have an approximately symmetrical course over time, ie that the falling flanks of the rotational speed of vibration last approximately the same length as the rising flanks of the rotational speed within one oscillation period.
  • the speed curve of the electric machine in the presence of freewheeling phases differs in principle from the fact that the falling edges of the speed oscillation last significantly longer than the rising edges. Such a deviation can be determined safely and particularly easily by means of a relation between the time drop of the speed oscillation of the electric machine and a total oscillation period of the internal combustion engine. It is understood, however, that even in the case of a previously asymmetric course of the speed oscillation required for a detection of the freewheeling phase relation can be adjusted accordingly.
  • the relation may be determined by means of quotient or difference formation, wherein the quotient of the temporally monotonous change of the rotational speed and one oscillation period is greater than a threshold value and / or the amount of the difference of the temporally monotonous change of the rotational speed and one Vibration period is greater than another threshold.
  • a threshold value a threshold value
  • / or the amount of the difference of the temporally monotonous change of the rotational speed and one Vibration period is greater than another threshold.
  • the quotients or differences between the temporally monotonous change in the rotational speed of the electric machine and an oscillation period of the internal combustion engine can basically assume a multiplicity of values.
  • a typical value for a threshold value of the quotient is approximately> 50%, that is to say that the falling edge lasts longer than the rising edge.
  • the oscillation period of the internal combustion engine from the rotational speed of the electric machine in particular by the time interval between two directly adjacent maxima of the speed is determined.
  • the speed of the electric machine is substantially identical to the speed of the internal combustion engine.
  • the period of the speed oscillation can be determined on the basis of time ranges in which there is certainly no free-running phase. This is especially in the range of the maxima of the speed, in particular in the transition between the rising edge and maxima of the speed given.
  • a further advantageous embodiment of the invention manifests itself in the arithmetic unit, in particular a controller for an electrical machine, which is set up by the computer program provided on the arithmetic unit, in particular on a storage medium of the arithmetic unit, to carry out a method as described above.
  • arithmetic unit in particular the controller, not only serves to control the electric machine, but is also set up for carrying out the method according to the invention.
  • Figure lb shows a schematic representation of a method for determining a freewheeling phase of an electrical machine
  • Figure 2 shows a time course of a phase voltage, the derived therefrom at certain times speed of an electric machine and the time course of a speed of a pulley;
  • FIG. 3 shows a representation similar to FIG. 2, in which additionally the criteria required for determining the freewheeling phases are shown;
  • FIG. 4 shows an illustration, similar to FIGS. 2 and 3, of the rotational speeds in an enlarged view, at a fixed first rotational speed
  • Figure 5 shows a similar to Figure 4 representation of the rotational speeds in an enlarged view, at a fixed further speed.
  • FIG. 1 shows a method (cf., FIG. 1b) for determining free-wheeling phases PhiFi of an electric machine 114 on the basis of the electric machine 114 shown in FIG. 1a and coupled to a freewheeling element 111 to an internal combustion engine 112, which is connected to a pulley RS of FIG electric machine 114 engaging the coupling element 116 is driven by the internal combustion engine 112.
  • the coupling element 116 is operatively connected to the crankshaft 117 of the internal combustion engine 112 on the engine side.
  • the internal combustion engine 112 is due to the working cycles of the respective cylinder of the internal combustion engine 112 that Torque impulsively to the crankshaft 117 from.
  • the pulsed torque output of the internal combustion engine 112 is accompanied by abrasion of the coupling element 116, which is alleviated by the free-wheeling element 111 provided on the electric machine 114.
  • a computing unit 118 in the form of a regulator 120 is provided, which adjusts the exciter current IE IT of the electrical machine 114 in accordance with the voltage of the vehicle electrical system 100.
  • a communication connection 124 may also be provided (shown in dashed lines).
  • the controller 120 can also be provided to carry out the method described below for determining the freewheeling phases PhiFi of the electric machine or of the deceleration torque M of the electric machine 114.
  • FIG. 1 b shows a method for determining freewheeling phases PhiFi schematically in a flowchart.
  • step El the time profile of a phase signal 121 of the electric machine 114 is detected.
  • step E2 a time profile of a rotational speed n is determined from the phase signal 121 of the electric machine 114 at a plurality of points in time To- ⁇ (cf. FIG. 2).
  • the speed nGen of the electric machine 114 can be determined from the phase signal 121, provided that the number of phase pulses is sufficient is large, in order to map the respective speed changes accordingly.
  • the number of phase pulses P required for this depends on the Nyquist theorem (see below).
  • the rotational speed ⁇ of the internal combustion engine 112 can also be determined in phases in which the electric machine 114 has no freewheeling phases PhiFi, since in these phases the electrical machine 114 and the internal combustion engine 112 are forcibly coupled and their rotational speeds taking into account a possible transmission ratio U b between the internal combustion engine 112 and electrical machine 114 are identical. If the rotational speed n is now determined, it is provided in a further step Dz in order to check, using a first criterion K1 and a second criterion K2, whether there is a freewheeling phase PhiFi.
  • the first criterion Kl serves to identify an oscillating speed oscillation in the time course of the rotational speed n and the second criterion K2 to identify a time change of the rotational speed n characteristic of a freewheeling phase PhiFi.
  • the internal combustion engine 112 outputs its respective torque, due to the working cycles of the individual cylinders, in a pulse-like manner to the crankshaft 117.
  • the frequency of the torque output is essentially determined by the current speed and the number of cylinders of the internal combustion engine 112, in particular of an internal combustion engine.
  • the frequency of the pulse-like torque output is coupled into the electric machine 114 such that this as the average speed signal 123a, b (see. Figure 2) reflect superimposed oscillations.
  • Such oscillations are particularly well detectable in an idle state of the internal combustion engine 112.
  • Freewheel phase PhiFi which is why it is checked according to the first criterion Kl, whether such oscillations are present with sufficiently large amplitude.
  • An exclusion of an overrun operation in a determination of freewheeling phases PhiFi is advantageous for the reason that a coasting operation, which can sometimes have a speed curve falling in a similar manner to a freewheeling phase PhiFi, can not be erroneously interpreted as a freewheeling phase.
  • the first criterion Kl can be determined particularly easily on the basis of a minimum value n m in and a maximum value n ma x of the rotational speed n, wherein the magnitude of the difference between the minimum value n m in and the maximum value n ma x is greater than one
  • Threshold nGrenz is. Minimum values n m in or maximum values n max of the rotational speed n are particularly easy to detect by measurement. By subtraction of the magnitude of the minimum value n m in and the maximum value n ma x of the rotational speed oscillations, their amplitude can be determined.
  • the threshold nGrenz can be selected according to the magnitude of the amplitude, which in
  • threshold nGrenz is speed-dependent, this is in each case determined as a function of the average rotational speed 123a of the electric machine 114 (cf., FIGS. 4 and 5).
  • the oscillations of the rotational speed are damped by the onset of the freewheel 111. This is given in time ranges TAbfaii, in which the speed curve of the electric machine has speed slopes with decreasing slope.
  • TAbfaii time ranges
  • K2 for identifying a time variation of the speed n, which is characteristic of a free-running phase PhiFi, e.g. a time monotonically or strictly monotonically falling edge of a speed n.
  • the second criterion K2 is determined based on a relation between the temporal change TAbfaii the rotational speed n, which is preferably a temporally monotonically decreasing change in the rotational speed n, and a vibration period ⁇ ⁇ of the internal combustion engine 1 12.
  • TAbfaii the temporal change TAbfaii the rotational speed n
  • ⁇ ⁇ the vibration period
  • the invention is based on the finding that the oscillations of the rotational speed n Rs caused by the internal combustion engine 112 have an approximately symmetrical course over time, ie, that the falling edges 126 b of the rotational speed of vibration last approximately the same length as the rising edges 124 b of the rotational speed oscillation
  • the speed curve nGen of the electric machine 114 in the presence of free-running phases PhiFi differs in principle from the fact that the falling edges 126a of the speed oscillation last significantly longer than the rising edges 124a. The same applies to the times TAbfaii and TAnction assigned to the edges.
  • the relation is determined by means of quotient or difference formation, wherein the quotient of the temporally monotonous change the rotational speed n and a period of oscillation is greater than a threshold value and / or the amount of the difference of the temporally monotonous change in the rotational speed and a period of oscillation ⁇ ⁇ is greater than a further threshold value TGrenz.
  • the period duration ⁇ ⁇ of an oscillation of the internal combustion engine 112 can be determined either on the basis of external rotational speed data (for example from the engine control 122) or based on the data already present in the electric machine 114.
  • the quotients or differences between the temporally monotonous change in the rotational speed n of the electric machine 114 and an oscillation period ⁇ ⁇ of the internal combustion engine 114 can assume a multiplicity of values.
  • a typical value for a threshold value TGrenz of the quotient is approximately> 50%, ie, the falling edge 126a lasts longer than the rising edge 124a.
  • the speed nGen of the electric machine 114 is substantially identical to the rotational speed ⁇ of the internal combustion engine 112 multiplied by the transmission ratio Ub.
  • the period ⁇ ⁇ of the speed oscillation can be determined based on time ranges in which certainly no free-running phase PhiFi is present.
  • Time points To - Je is determined, in which the phase signal 121 has an ascending and / or falling edge.
  • a determination of the rotational speed n only at times of the edges of the phase signal 121 is particularly easy to implement metrologically. By including as many edges as possible in the speed detection, the resolution of the speed n can be increased accordingly.
  • the rotational speed need not be determined on each pulse of a phase signal 121.
  • the first criterion K1 and the second criterion K2 can be reliably determined on the basis of the existing measuring points of the rotational speed n or if the falling edge 126 of the rotational speed n can be resolved so well that it reliably closes to a freewheeling phase PhFi can be.
  • the number of pulses P required for the phase signal 121 or the measurement times of the rotational speed n, time stamp To-Je results from the Nyquist theorem.
  • the respective points in time of the speed detection preferably result from a defined potential value Uzs of the phase signal 121 in the case of a phase voltage or a phase current Izs in the event that a phase current is used for speed determination (not shown). This is a particularly easy and reproducible way Set times of a speed detection. From the difference of the adjacent time stamp To - Je, an instantaneous speed n can be determined.
  • the number of timestamps To - Tn necessary for determining the freewheeling phase PhiFi results from the Nyquist theorem.
  • the sampling rate of the generator 114 is sufficient to correspondingly resolve the rotational speed n and in particular the oscillations superimposed on the rotational speed
  • the speed curve n Rs of the pulley has by the forced coupling means of the belt 116 to the internal combustion engine 112, the characteristic, due to the working cycles of the cylinder of the internal combustion engine 112, oscillating speed curve.
  • the speed n Rs of the pulley RS results, as already stated, as a multiplication of the speed nßkm of the internal combustion engine 112 with the transmission ratiorod of the belt drive between the internal combustion engine 112 and electric machine 114th
  • the electric machine 114 Due to the freewheeling element 111 of the electric machine 114, in the freewheeling phases PhiFi the electric machine 114 has a higher rotational speed nGen compared with the rotational speed n Rs of the pulley RS in the same time interval. Accordingly, the associated average speed 123a of the electric machine 114 is slightly higher than the average speed 123b of the pulley RS.
  • the arithmetic unit 118 can determine both the speed nGen of the electric machine 114 and the speed nßkm of the crankshaft 117 of the internal combustion engine 112, provided that the transmission ratio Ub is assumed to be known.
  • the speed nGen of the electric machine 114 can be determined from the phase signal 121 of the electric machine 114. In principle, however, it is understood that the rotational speeds nGen, nßkm of the electric machine 114 and / or the internal combustion engine 112 can alternatively and / or cumulatively by other means, for example by means of a speed sensor can be determined (not shown).
  • phase signal 121 is one of the phase voltages 121 of the electric machine 114. It is understood that for this purpose in principle any desired phase voltage of one or more phases of the electric machine 114, but also the respective phase currents can be used in order to determine therefrom the speed signal nGen of the electric machine 114. When using more than one phase voltage, a correspondingly higher temporal resolution of the speed signal 122 can be achieved (not shown).
  • the phase voltage 121 runs in a generator with current output in a first approximation rectangular.
  • the signal of the phase voltage 121 has phase pulses P, each having a mean phase time or pulse width Tphase. This corresponds to the difference between a pair of adjacent time stamps To- ⁇ , wherein, depending on the number of total pulses and the rotational speed n to be resolved, this does not necessarily have to be the immediately adjacent phase pulses P.
  • the current speed nGen of the electric machine 114 can be determined simply on the basis of the pulse width Tphase of the pulses P, wherein the pulse width Tphase can preferably be determined on the steep edges of the phase voltage 121.
  • the generator speed thus results from the formula: where nGen is the rotational speed of the electric machine 114 in revolutions per minute, and PPZ is the pole pair number of the electric machine 114.
  • the applied to the electric machine 114 total torque M is still shown, it can be seen that when decoupling the electric machine 114 of the internal combustion engine 112 in the freewheeling phases PI this falls to a minimum plateau and the reengage of the internal combustion engine 112 accordingly leaps and bounds increases.
  • the speed can preferably be determined on the basis of the mean value between in each case 2 phase edges.
  • the instantaneous speed ⁇ can also be determined when the freewheel is inactive or not present.
  • the controller 118 may store a fixed number of rotational speed values in a memory, for example in a shift register (not shown) and at least one maximum within each one oscillation cycle and determine a minimum instantaneous speed.
  • the maximum and minimum instantaneous speeds are preferably the peak speeds (local minima and / or maxima) in the respectively recorded time range.
  • the difference between these rotational speeds n is a measure of the torque M. emitted by the internal combustion engine 112.
  • the rotational speed can be determined on the basis of the ascending 126 and falling flanks 124 (see FIG. 2 or 3) of the phase voltage 121.
  • the Nyquist criterion it is possible to dispense with the determination of individual phase pulses in order to relieve the memory in order to reduce the amount of data resulting from a determination of freewheeling phase PhFi.
  • any desired number of rotational speed values n can be detected in the memory, although approximately one complete cycle of a vibration should be recorded for an evaluation. As already stated, several cycles of the speed oscillation can be detected for even more accurate speed determination.
  • the concrete time range of the freewheeling phases PhFi can be localized in the time ranges of falling edges 126 of the rotational speed n.
  • the physical quantities indicated in the figures primarily serve the qualitative description of the invention and are correspondingly scalable with respect to an respectively used internal combustion engine 112 or electric machine 114.
  • the speed curves n Rs and nGen the pulley RS and the electric machine 114 with freewheel 111 are exemplary of different speeds n Rs the pulley RS - Figure 4 at 1,800 rpm and in Figure 5 at 18,000 rpm - over a period represented by 50 ms.
  • the amount of the difference of the minimum value m in n and the maximum value n ma x, and thus the threshold value nlimit depend strongly on the mitt ⁇ sized 123a speed of the electrical machine 114th Since the time ⁇ ⁇ (see Figure 2) depends linearly on the average speed 123a of the electric machine 114, with the generator speed nGen also increases the frequency 1 / Tßr. So with ⁇ a result, the time duration of the freewheeling phases PhiFi shortened and thus the magnitude of the absolute value of n ma x - n m in which is necessary in order to achieve a free-wheeling phase ⁇ PhiFi is reduced.
  • Figure 4 shows the conditions at low speeds.
  • the absolute value of the maximum occurring gradient ie the gradient of a falling edge 126b in the speed curve n Rs of the pulley RS, must be greater than the slope of the generator rotational speed nGen in the time range of a freewheeling phase PhiFi.
  • Figure 5 shows the conditions at low speeds.
  • Oscillation frequency f moment due to the speed difference varies by a factor of 10, the occurring maximum negative slope of the falling edge 126b in the speed curve n Rs of the pulley RS by a factor of 10. Furthermore, the time of an active freewheel at high speeds significantly shorter than at low speeds , The difference n ma x - n m in so can not accept similarity ⁇ Lich high values, such as at low speeds (see Figure. 4). Therefore, provided that the criterion 1 (Determination of the amount of the absolute value ma n x - n m) of the average rotational speed 123a of the electrical machine 114 is from ⁇ pending.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)

Abstract

L'invention concerne un procédé de détermination de phases de roue libre (PhFI) d'une machine électrique (114) qui est couplée à moteur à combustion (112) au moyen d'une roue libre (111) et qui comprend les étapes consistant à détecter une variation dans le temps d'un signal de phase (121) de la machine électrique (114), déterminer une variation dans le temps d'au moins une vitesse de rotation (n) à partir du signal de phase (121) et déterminer au moins une phase de roue libre (PhFI) de la machine électrique (114) à partir de la vitesse de rotation (n) avec prise en compte d'un premier critère (K1) et d'un second critère (K2). L'invention concerne également une unité de calcul (118) correspondante qui est configurée pour mettre en œuvre le procédé, ainsi qu'un programme informatique correspondant.
PCT/EP2017/057112 2016-05-20 2017-03-24 Détermination de phases de roue libre d'une machine électrique couplée à un moteur à combustion interne au moyen d'une roue libre WO2017198381A1 (fr)

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Application Number Priority Date Filing Date Title
CN201780031360.XA CN109275352A (zh) 2016-05-20 2017-03-24 确定利用飞轮被耦合到内燃机的电机的空转阶段
EP17713919.3A EP3459171A1 (fr) 2016-05-20 2017-03-24 Détermination de phases de roue libre d'une machine électrique couplée à un moteur à combustion interne au moyen d'une roue libre

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DE102016208704.5 2016-05-20
DE102016208704.5A DE102016208704A1 (de) 2016-05-20 2016-05-20 Ermitteln von Freilaufphasen einer mit einem Freilauf an eine Brennkraftmaschine gekoppelten elektrischen Maschine

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DE102016212955A1 (de) 2016-07-15 2018-01-18 Robert Bosch Gmbh Ermitteln eines Betriebszustand einer mit einem Freilauf an eine Brennkraftmaschine gekoppelten elektrischen Maschine

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