DE102009047034A1 - Control and method for operating the controller for a starting device - Google Patents

Abstract

The invention describes a method for operating a controller (5) for a starting device (1) with a starter motor (6) for starting an internal combustion engine (2) of a vehicle with an on-board electrical system (3), the starter motor (6) being controlled by the controller ( 5) is controlled, in particular for a start-stop operating mode of the vehicle. In order to reduce the load on the vehicle electrical system (3), in particular a voltage drop, during the starting process, the controller (5) records at least one parameter for determining a state of the vehicle electrical system (3) and the starter motor (6) is at least dependent on the Parameters controlled.

Description

State of the art

The invention relates to a method for operating a controller for a starting device with a starter motor for starting an internal combustion engine of a vehicle with a vehicle electrical system, wherein the starter motor is controlled by the controller, in particular for a start-stop operating mode of the vehicle. The invention further relates to such a controller and to a computer program product.

There are electric rotary field drives known as electrical machines, with different types of commutation are used, for example, a field-oriented control or block commutation.

Further, systems for stopping and restarting an internal combustion engine of a vehicle are known, wherein the internal combustion engine is started with a starter motor, which may be in particular a three-phase machine. With such a system, namely a so-called start-stop system, the internal combustion engine due to a short stop of the vehicle, for example, at a red light, off and restarted to continue driving to fuel consumption and exhaust emission, especially a CO ₂ emission, reduce.

There is known a start-stop system in which the internal combustion engine is started with a conventional starter by the starter motor engages by means of a pinion in a ring gear on a flywheel of the internal combustion engine. Furthermore, another start-stop system is known in which a starter generator is operable as an electric machine both as a motor and as a generator and is designed as Klauenpolgenerator. The starter generator is coupled with a belt drive with the internal combustion engine. The following description is, unless explicitly known, equally related to a starter motor and a starter generator, for clarity, only the starter motor is called. Incidentally, it is known to operate a starter motor, including a starter generator, with an electronic control unit.

To start the internal combustion engine, a high electrical power is required, which is taken from a vehicle electrical system of the vehicle and fed to the starter motor, wherein the electrical system is powered by a power supply device, such as a lead-acid battery. The high electrical power is achieved with a high current flow, which leads due to resistances, such as a line resistance of the electrical system or an internal resistance of the power supply to a voltage drop in the electrical system, essentially in accordance with Ohm's law. This voltage dip leads to repercussions on other connected electrical loads on the electrical system, such as sensors, control units, display elements, controls or an audio system. There is a risk that a voltage in the electrical system drops below a certain value and safe operation of the electrical loads, especially when starting the internal combustion engine, is not guaranteed. Thus, for example, one or more control devices can go into a reset, that is, the original state, or a short-term failure of the display element or of the audio system can occur.

In order to reduce the voltage dip, the electrical system and the power supply device are designed with a low internal or line resistance, and indeed they are costly dimensioned for an unfavorable case, namely the load of the electrical system when starting the internal combustion engine and thus for normal operation of the electrical system outside oversized startup.

The US 6,577,097 B2 describes a method for limiting a current consumption of the starter motor when starting the internal combustion engine, in which a control of the starter motor is switched with a pulse inverter speed-dependent between two operating modes. In this case, a switch from 120 ° to 180 ° -Blockbestromung done at a defined limit speed, whereby the power consumption is limited.

The DE 101 00 889 A1 describes a method for ensuring the power supply in a vehicle with a start-stop operating mode, wherein the power supply during downtime of the internal combustion engine using two sub-electrical systems is carried out, each comprising an energy store. As a result, when starting the internal combustion engine, the voltage drop in a sub-board network is reduced.

It is an object of the invention to provide a controller, a method for operating the controller and a computer program product of the type mentioned in such a way that a load on the electrical system, in particular the voltage dip, is reduced during the starting process.

Disclosure of the invention

According to the invention the object is achieved by the subject matter of patent claims 1, 9 and 10 solved. The dependent claims define preferred embodiments of the invention.

It is an idea of the invention that at least one parameter for determining a state of the vehicle electrical system is detected by the controller and the starter motor is actuated at least as a function of the parameter. Accordingly, it is also an idea of the invention that the controller comprises a detection and evaluation device, namely for detecting at least one parameter for determining a state of the electrical system, and that the control for driving the starter motor is formed at least in dependence on the parameter. Thus, the load on the electrical system, in particular the voltage dip, when starting the engine can be reduced. In particular, it is possible, at least for a defined period of time, to avoid falling short of a specific lower voltage limit, so that the operation of further electrical loads on the vehicle electrical system is ensured. Thus, it is possible to ensure a certain on-board network stability in order, for example, to prevent an unwanted reset to an original state of other control devices. Overall, an increase in reliability is achieved because malfunction is avoided by an undervoltage due to the voltage drop in the electrical system.

The fact that the starter motor is ultimately controlled as a function of the state of the on-board network, can also temporally variable effects, such as aging effects, wear or changing environmental factors, such as a temperature take into account to operate the starting device efficiently by an optimal control of the starter motor.

Finally, the power for starting the internal combustion engine, so a power consumption of the starter motor, maximize, in such a way that as high a power is achieved within set limits, in particular the voltage drop.

Incidentally, the controller can be arranged on or in the starter motor or can be designed as a separate control unit. The controller is preferably designed as a separate controller for the starting device, but may also be designed as a controller already present in the vehicle, for example a motor controller.

Furthermore, the controller can be designed as a structural unit, in particular in a housing, or can also comprise a plurality of control units, wherein such a control unit can also carry out further control tasks not described here. Accordingly, the method steps described above and below can be executed distributed in only one control device or also on a plurality of control devices.

According to a preferred embodiment, a power consumption, in particular a current consumption, of the starter motor is limited as a function of the parameter. Thus, the starting device, the power supply device and / or the electrical system can be realized inexpensively by being designed only for a correspondingly limited power. In addition, a space saving can be achieved because the power supply device with a higher internal resistance, so in a more compact design, can be realized.

Limiting here means that a predetermined maximum permissible setpoint, in particular a power or a current setpoint, is not exceeded. For this purpose, the power consumption, in particular the current consumption, of the starter motor can be correspondingly reduced and / or a growth in power consumption, or the power consumption, can be prevented by this setpoint, by a suitable control of the starter motor. The maximum permissible set value can be permanently programmed in the controller or be stored in a further control unit or a measuring device, which will be explained later. Incidentally, the maximum permissible setpoint can also be determined by at least the parameter and / or an operating variable, in particular the starting device or the vehicle, for example before or during startup of the starting device, ie before a starting process.

Incidentally, said limitation may also be a function of time, wherein the parameter may include time information. Thus, for example, within a certain period of time after switching on the starting device, in particular after the start of the energization of the starter motor, the power consumption or the current consumption can be limited. The period of time can essentially correspond to a start-up duration of the starter motor, so that virtually a start-up current and the resulting voltage dip in the vehicle electrical system is reduced.

Incidentally, the limitation can increase operational safety by preventing malfunctions due to the voltage dip. In addition, due to the reduced current consumption, a service life of components in the electrical system, for example the voltage supply device, in particular a battery, increases and, for example, wear of the starting device and the battery due to the reduced Power consumption can be reduced, wherein the power consumption, in particular the current consumption of the starter motor is preferably limited or reduced to a certain minimum value at which a reliable start of the internal combustion engine is ensured.

It is preferred that the controller comprises a circuit arrangement, in particular with a microcomputer, a memory, a communication device and / or a measuring device. Thus, the control can be realized in a compact design and it can be used synergetically electronic components for the components mentioned.

Further, it is preferred that the operating variable, in particular a current in a stator winding of the starter motor, a voltage in the electrical system, a current in the electrical system, a speed of the starter motor, a speed of the internal combustion engine, a temperature, a current of the voltage supply device, an age of the voltage supply device and / or a state of the voltage supply device, preferably by means of at least one sensor and a detection device, is detected and from this the parameter is derived, preferably by means of an evaluation device. In this case, the temperature may be a temperature of the starter motor, the on-board network and / or the voltage supply device, in particular since their internal or line resistances change as a function of the temperature. With the or the operating size (s) a simple determination of the condition of the electrical system is made possible.

Incidentally, at a rotational speed as the operating variable, the starter motor can be controlled as a function of a certain rotational speed range, wherein this region itself can be dependent on the state of the vehicle electrical system, the voltage supply device and / or switched on electrical loads.

The state of the vehicle electrical system can be detected particularly easily by selecting the operating variable as a parameter. The parameter thus corresponds directly to the operating size.

It is preferred that the parameter is derived by means of a model, a formula and / or a characteristic field, in particular from at least one operating variable. This allows, for example, tolerances, disturbances or a complicated relationship between the operating size and the condition of the electrical system considered. Furthermore, a plurality of operating variables can be detected and from this the parameter can be derived, in particular by means of the model, the formula and / or the characteristic map. This makes it possible to determine the condition of the electrical system more precisely.

The model, the formula and / or the map can be stored, preferably stored in the controller, and in particular can describe the behavior of the electrical system, the starting device, the internal combustion engine and / or the starter motor. Thus, a relationship or a dependence between one or a plurality of operating variables and the state of the electrical system can be considered simply and precisely.

In a preferred embodiment, the operating variable is detected by a measuring device. In this way, a current, actual value of the operating variable can be determined and the state of the vehicle electrical system can be determined precisely. In this case, the measuring device can be formed independently and / or separately from the controller, in particular as an already existing sensor or component of another control device in the vehicle. The measuring device may also be part of the controller, in particular wherein the operating variable to be measured is also controlled by the controller. Thus, the control can be realized compactly and inexpensively together with the measuring device.

Incidentally, the parameter, in particular the operating variable, can be detected as information with a communication device, in particular by means of a communication with a signal or data source, for example the measuring device or a control device. Thus, an already determined operating variable, in particular via a data or signal line, can be detected by the controller. In this case, the communication between the controller and, for example, a measuring device for the voltage in the electrical system, the current in the electrical system, the speed of the starter motor, the speed of the internal combustion engine and / or the temperature, for example on the starter motor may be formed. Furthermore, with the communication device, a communication between the controller and an engine control unit, a transmission control unit, a vehicle electrical system control unit, a voltage supply device control unit, in particular a battery management device, and / or sensors, for example for detecting a crank angle, ie a rotational position of a crankshaft of the internal combustion engine, or a Battery state, be formed.

In order to improve functional properties of the starting device, it is preferred that the voltage supply device, in particular of the electrical system and / or the starter motor is switched, in particular by at least one additional voltage source is switched, in particular in a series or Parallel connection, or switched to a more powerful voltage source. It is therefore preferred that the controller is formed with a switching device for the voltage supply device, in particular for switching at least one additional voltage source, in particular in a parallel or series circuit, or for switching to a more powerful voltage source. As a result, higher operating voltages, for example, for a higher torque of the starter motor, especially at higher speeds, realize, preferably by at least one additional voltage source is connected in series with at least one already existing voltage source. Furthermore, an internal resistance of the voltage supply device can be reduced by connecting at least one voltage source in parallel to at least one further voltage source. As a result, a current output of the voltage supply device can be increased and the voltage drop in the electrical system can be reduced. With both types of circuit can thus, in particular for a starting process, increase an electrical power or reduce a load on a single voltage source, for example, to extend their life. The switching or switching of a voltage source can be done before or during the operation of the starter motor, ie the starting process.

The voltage source may be formed as a battery, line battery or as a capacitor. Thus, by switching the power supply device, the electrical system can be supported by an additional voltage source and / or increase an electrical power of the starting device.

Overall, in a particularly preferred embodiment, the voltage drop can be reduced by, as described above, the power consumption of the starter motor is limited and additionally or alternatively, the electrical system with a higher voltage or higher power, depending on the circuit of the power supply device is fed.

It is preferred that a commutation of the starter motor is controlled, in particular varies, and in particular by a duty cycle of the drive, a block width of drive pulses, preferably between about 120 ° and about 180 °, a Vorkommutierungswinkel, ie a phase angle between a rotor field and a stator field, and / or a number of phases to be energized is driven. Furthermore, it is preferred that the controller comprises power electronics for the starter motor, so that the controller can directly control the commutation of the starter motor and can be realized by a compact design. By varying the control of the commutation, the power consumption, in particular the current consumption, of the starter motor can be varied, preferably as described above. Thus, the voltage drop during operation of the starter motor can be reduced by a suitable control, in particular without additional measures or devices.

In this case, as mentioned above, the power consumption can be reduced by the duty cycle, with which the power electronics drives the starter motor, is varied. Furthermore, the block width of the drive pulses can be varied in a block commutation, for example, between 120 ° and 180 ° Blockbestromung, wherein the block commutation can be changed continuously or stepwise. Furthermore, a current control in a field-oriented control can be realized. Thus, energized phases can be switched, for example by the starter motor is designed for a certain number of phases and only a suitable proportion of these phases is energized. Furthermore, the phase position between the rotor field and the stator field can be varied, that is, the pre-commutation angle can be changed in order to control the current consumption of the starter motor.

According to a preferred embodiment, the starter motor can be controlled at least as a function of the parameter by comparing the parameter with a desired value and determining a change in the control of the starter motor, in particular the commutation described above, from a deviation between the parameter and the desired value. The controller may thus be designed for mere control, but is preferably designed as a control. Preferably, the starter motor is thus controlled so that the electrical system assumes a suitable state, which is predetermined by the desired value of the parameter. Overall, therefore, in particular external influences, such as a temperature, aging and wear effects, influences of other electrical loads can be considered.

The object is further achieved by a computer program product loadable in a program memory with program instructions for carrying out all the steps of a previously or subsequently mentioned method when the program is executed in the microcomputer, in particular the controller. For this purpose, as mentioned above, the control with the microcomputer and the memory is formed. The computer program product can be used to evaluate the parameter and to control the starter motor at least as a function of the parameter. With the computer program product can also be particularly easy to implement or use the said model, the formula and / or the map to the parameter of a farm size derive and thus determine the state of the electrical system.

It goes without saying that the features mentioned above and those yet to be explained below can be used not only in the respectively specified combination but also in other combinations.

Brief description of the drawings

The invention will be explained in more detail below with reference to the drawings. Show it:

1 a schematic representation of a controller,

2a a flowchart of a method for operating the controller,

2 B a temporal course of company sizes,

3 a flowchart of another embodiment of the method for operating the controller,

4 a circuit diagram of a power amplifier and

5 a circuit diagram of a power supply device.

Embodiments of the invention

The 1 shows a schematic representation of a controller 5 for a starting device 1 with a starter motor 6 for starting an internal combustion engine 2 an unrepresented vehicle with a vehicle electrical system 3 wherein the vehicle is designed for a start-stop operating mode in order to switch off the internal combustion engine for short stopping phases of the vehicle, for example at a red traffic light, and then switch it on again for further travel, so that fuel consumption and exhaust emissions, in particular CO ₂ emissions, be reduced. The electrical system 3 feeds additional onboard power consumers 22 , For example, an engine control unit, a brake safety controller, display elements, controls and / or an audio system.

The starter motor 6 is designed as a starter generator, so that he as an electric machine both as a motor for starting the internal combustion engine 2 as well as a generator for generating electrical energy can be used. The starter motor 1 is about a belt drive, which is a pulley 7 , a drive belt 8th , a deflection and tensioning pulley 10 and another pulley 12 Includes, with a crankshaft 13 the internal combustion engine 2 connected, being on the crankshaft 13 a flywheel 14 , For example, a dual-mass flywheel is arranged. By the belt drive so the starter motor 6 the internal combustion engine 2 drive to start this, or in a driving operation of the vehicle, the internal combustion engine 2 the starter motor 6 as a generator to generate electrical energy.

In an alternative embodiment, the starter motor 6 in other ways with the internal combustion engine 2 be coupled, for example via a transmission. It can be designed as a conventional starter, for starting by means of a pinion in a ring gear of the internal combustion engine 2 is coupled. What is important is that a mechanical power between the crankshaft 13 and the starter motor 6 is transmitted.

The control 5 is via a supply line 9 electrically with the starter motor 6 connected and is executed separately. The control 5 includes power electronics 15 , a microcomputer 16 with a memory 17 , a communication device 18 and a measuring device, namely a voltage sensor 19 , for measuring a voltage in the electrical system 3 ,

With the power electronics 15 becomes the starter motor 6 activated, as a motor and as a generator. This includes the power electronics 15 a built-in semiconductor switches pulse inverter, via which the starter motor 6 is controllable, in particular for a variable power consumption with a variable current.

About the voltage sensor 19 As a first parameter, the voltage in the vehicle electrical system is used 3 via a signal line 21 detected. Furthermore, the communication device detects 18 an information from a speed sensor 11 via a speed n of the starter motor 6 and information about a battery state of a voltage supply device 4 , where the information is over data lines 20 . 23 be transmitted.

From the speed n and from the battery state are from a computer program product stored in the memory 17 is stored and in the microcomputer 16 is executed, each further derived parameters that the state of the electrical system 3 determine. For this purpose, a formula and a model are implemented in the computer program product and it is for derivatives of the parameter on a map that in the memory 17 stored, resorted to.

The 2a shows a flowchart of a method for operating the controller 5 after 1 , In a step S1, the starter motor 6 via the power electronics 15 with a 180 ° block commutation for starting the internal combustion engine 2 operated. This leads before the controller 5 engages, at low speeds n of the starter motor 6 , Especially at its start, to a high power consumption, in particular a high power consumption of the starter motor 6 , so that a voltage dip in the electrical system 3 results in which the voltage in the electrical system 3 falls below a certain minimum value.

In a step S2, by means of the communication device 18 over the data line 20 a current I of the voltage supply device 4 from the controller 5 detected and compared with a maximum allowable setpoint of the current I. Incidentally, the maximum allowable set value of the current I is fixed in the computer program product of the controller 5 deposited or it is calculated on the basis of current parameters or operating variables, for example, from the rotational speed n, the state of the power supply device 4 or other electrical loads, in particular electrical system consumers 22 , or a temperature, preferably before or at each engine start.

In a step S3, the current consumption of the starter motor 6 depending on the parameter, in this embodiment the current I from the voltage supply device 4 , limited by a current difference from the measured current I and the maximum allowable setpoint of the current I is calculated. From the current difference, a setpoint for the commutation block width is derived, namely variable up to 120 °.

In a step S4, the commutation block width is continuously reduced from 180 ° to the target value 120 °, and thus the starter motor 6 controlled in dependence on the parameter, namely by the current consumption of the starter motor 6 is limited depending on the parameter. This reduces the voltage drop and the voltage in the electrical system 3 rises to a permissible value. Alternatively, the commutation block width can be switched from 180 ° to 120 ° instead of continuously in steps.

The method is also applicable to PWM-controlled converters, for example, with a field-oriented control. In this case, the amount of the desired current space vector can be derived directly from the measured current I of the voltage supply device.

Instead of the current I of the voltage supply device 4 As a parameter for determining the state of the electrical system to choose one or more operating variables can be detected and derived from the parameter. Such an operating variable, for example, the voltage in the electrical system 3 be that of the voltage sensor 19 the controller 5 is detected directly, and / or the rotational speed n of the starter motor 6 which as an information with the communication device 18 via communication with the speed sensor 11 is detected as a data source. From such an operating variable or from a plurality of such operating variables, the parameter can be derived by means of a model, a formula and / or a characteristic diagram, in particular by means of the computer program product.

The 2 B shows a time course of operating variables, namely the current I of the voltage supply device 4 , the voltage U of the voltage supply device 4 , which is essentially the voltage in the electrical system 3 corresponds, as well as the speed n of the starter motor 6 , By limiting the current consumption of the starter motor 6 The maximum current I is reduced by about 150 A, so that the voltage U drops only to 9.5 V at the voltage drop, instead of 8.5 V, not shown.

The 3 shows a flowchart of another embodiment of the method for operating the controller 5 , In a step S10, it is checked whether a vehicle electrical system stability is compromised by the controller 5 at least one parameter for determining the state of the electrical system 3 is detected. If this is the case, the method is continued with a step S11, otherwise with a step 14 , With stability of the electrical system 3 is called the voltage of the electrical system 3 is kept within a certain voltage range, in particular that it does not fall below a certain lower limit value or only for a certain period of time.

In step S11 it is checked whether a supporting measure to stabilize the electrical system 3 is possible. Such a measure may be that in the power supply device 4 at least one additional voltage source 40 is switched on or on a more powerful voltage source 40 is switched. In this case, such a voltage source 40 a conventional lead-acid battery or other power battery known in the art. When connecting a voltage source 40 This can be in parallel or in series with one already connected to the electrical system 3 connected voltage source 40 be switched so that either the voltage U or the possible power output increase. If such a supporting measure is possible, then the process continues in a step S12, otherwise in a step S13.

In step S12 is used to stabilize the electrical system, namely to reduce a voltage dip and / or to prevent the voltage in the electrical system 3 falls below a certain limit, the voltage supply device 4 switched so that an additional voltage source 40 parallel to one already on the electrical system 3 connected voltage source 40 is switched on. This will cause a current consumption of the starter motor 6 ensured and the voltage drop is reduced.

In step S13, the current consumption of the starter motor 6 limited by a commutation of the starter motor 6 is driven accordingly, by a block width of drive pulses of about 180 ° to about 120 ° is lowered.

In step S14, it is checked whether a start of the internal combustion engine 2 even with a reduced current consumption of the starter motor 6 is possible. If this is the case, the process continues with step S13, in which case the reduced current consumption causes electrical energy when the internal combustion engine is started 2 can be saved. Otherwise, a step S15 is continued, in the starter motor 6 operated at maximum power.

In the method for operating the controls, the aforementioned steps S10 to S15 are repeatedly performed to the on-board network 3 constantly to protect against a voltage dip.

Another, not shown embodiment differs from that in the 3 shown method in that in addition the step S10 and corresponding subsequent steps S11 to S15 according to the flowchart at least once before starting the internal combustion engine 2 is carried out preventively in order to check at an early stage whether the vehicle electrical system stability is at risk and the internal combustion engine 2 already at the beginning of starting the starter motor 6 as described above to drive suitable, so for example from the outset with a block width of 120 °.

For limiting the current consumption of the starter motor 6 the following control strategies are also conceivable:
Limiting the current consumption in certain speed ranges of the starter motor 6 , These areas may depend on the condition of the electrical system 3 , the voltage supply device 4 or the electricity in the electrical system 3 , in particular due to switched electrical loads, be.

Limiting the current consumption as a function of voltages or currents measured in the electrical system.

Limiting the current consumption as a function of an age of the voltage source 40 , especially the battery.

Limiting the current consumption as a function of a time, wherein it is conceivable, within a certain period of time after switching on the starting device 1 , in particular the starter motor 6 to limit the power consumption.

In particular, when the method with the computer program product in the microcomputer 16 in the controller 5 can run, if the need for power limitation of the starter motor 6 or the need to switch power sources 40 is detected, proceed as follows: switching the power supply device 4 , as described above, to a higher electrical power in the electrical system 3 feed.

Intervention in the control of the starter motor 6 , In particular by varying the duty cycle of the drive, changing the block width in a block commutation, current control in a field-oriented control, and / or changing the phase angle between the stator and rotor field. The aforementioned measures are applicable in combination or individually.

In the method, in particular one or more of the objectives explained below can be followed, in particular by a suitable control of the starter motor 6 depending on the parameter. The following goals are preferred in the following order.

Ensuring the on-board network stability. It is aimed in particular at a minimum electrical voltage in the electrical system 3 not to fall below or only for a defined period of time. So can a reliability of the on-board network 3 connected consumers 22 guarantee.

Maximize a possible power output of the starter motor 6 , Within this limit, the highest possible performance is achieved. So is a reliable start of the engine 2 guaranteed.

Maximize the life of components in the electrical system 3 , in particular a voltage source 40 For example, a conventional battery. This is the starter motor 6 operated with the lowest possible power, however, the Starting the internal combustion engine 2 must be sufficient.

To achieve these goals is based on stored information, such as models, formulas, maps, in particular the behavior of the starting device 1 and / or the electrical system 3 describe, or on measured values, in particular operating variables, a conclusion on the condition of the electrical system 3 and / or the starting device 1 deliver, resorted to.

The 4 shows a circuit diagram of a power output stage of the power electronics 15 and the starter motor 6 namely an inverter 32 with six semiconductor switches 34 , for example, MOSFETs, or IGBTs. The inverter 32 is via a control line 33 with the microcomputer 16 the controller 5 connected, so that the current consumption of the starter motor 6 via the electrical system 3 through the controller 5 is controlled by the starter motor 6 by means of suitable driving of the semiconductor switches 34 is controlled. The supply line 9 is three-phase, for three stator windings 35 the starter motor 6 ,

The 5 shows a circuit diagram of the power supply device 4 that have two voltage sources 40 , For example, each includes a lead-acid battery includes. By means of four switching elements 41 , which are formed for example as a relay or as electronic elements such as diodes, FET or IGBT, the two voltage sources 40 optionally in series or in parallel, or in each case only one of the voltage sources 40 with the electrical system 3 get connected. In this case, the switching elements 41 via a control line 42 from the controller 5 controlled, so the controller 5 between the voltage sources 40 can switch over or even a voltage source 40 in addition to an already on the electrical system 3 switched voltage source 40 can switch on or off. In this case, by a suitable control of the switching elements 41 , as described above, in a series circuit, the voltage in the electrical system 3 increases or in a parallel connection an internal resistance of the voltage supply device 4 be reduced to the electricity in the electrical system 3 to increase. All figures show only schematic not to scale representations. Moreover, reference is made in particular to the drawings for the invention as essential.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• US 6577097 B2 [0007]
• DE 10100889 A1 [0008]

Claims (10)

Method for operating a controller ( 5 ) for a starting device ( 1 ) with a starter motor ( 6 ) for starting an internal combustion engine ( 2 ) of a vehicle with a vehicle electrical system ( 3 ), wherein the starter motor ( 6 ) by the controller ( 5 ), in particular for a start-stop operating mode of the vehicle, characterized in that the controller ( 5 ) at least one parameter for determining a state of the electrical system ( 3 ) and the starter motor ( 6 ) is driven at least in dependence on the parameter. A method according to claim 1, characterized in that a power consumption, in particular a current consumption of the starter motor ( 6 ) is limited depending on the parameter. A method according to claim 1 or 2, characterized in that an operating variable, in particular a current in a stator winding of the starter motor ( 6 ), a voltage in the electrical system ( 3 ), a current in the electrical system ( 3 ), a speed (n) of the starter motor ( 6 ), a speed of the internal combustion engine ( 2 ), a temperature, a current (I) of a voltage supply device ( 4 ), an age of the power supply device ( 4 ) and / or a state of the power supply device ( 4 ), and from this the parameter of the vehicle electrical system state is derived. A method according to claim 3, characterized in that the parameter is derived by means of a model, a formula and / or a map, in particular from at least one operating variable. Method according to one of the preceding claims, characterized in that the parameter, in particular the operating variable, as information with a communication device ( 18 ), in particular by communication with a signal or data source ( 11 ), in particular the measuring device or a control unit. Method according to one of the preceding claims, characterized in that a voltage supply device ( 4 ), in particular the electrical system ( 3 ) and / or the starter motor ( 6 ), in particular by at least one additional voltage source ( 40 ), in particular in a series or parallel connection, or to a more powerful voltage source ( 40 ) is switched. Method according to one of the preceding claims, characterized in that a commutation of the starter motor ( 6 ), in particular varies, and in particular by a duty cycle of the drive, a block width of drive pulses, preferably between about 120 ° and about 180 °, a Vorkommutierungswinkel, ie a phase angle between a rotor field and a stator field, and / or a number is driven by energized phases. Method according to one of the preceding claims, characterized in that the parameter is compared with a desired value and from a deviation between the parameter and the desired value a change in the control of the starter motor ( 6 ), in particular the commutation according to claim 7, is determined. Computer program product stored in a program memory ( 17 ) is loadable with program instructions to carry out all the steps of a method according to at least one of claims 1 to 8, when the program is stored in a microcomputer ( 16 ), in particular the controller ( 5 ), is performed. Control ( 5 ) for a starting device ( 1 ) with a starter motor ( 6 ) for starting an internal combustion engine ( 2 ) of a vehicle with a vehicle electrical system ( 3 ), in particular for a start-stop operating mode of the vehicle, in particular the controller ( 5 ) for a method according to one of claims 1 to 8, preferably with a computer program product according to claim 9, characterized in that the controller ( 5 ) comprises a detection and evaluation device, for detecting at least one parameter for determining a state of the electrical system ( 3 ), and that the controller ( 5 ) for driving the starter motor ( 6 ) is formed at least in dependence on the parameter.

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