DE102009041721A1 - Method for operating hybrid vehicle, involves switching on operating unit of motor vehicle on based on demand of motor vehicle, and determining time point in which request for switching operation unit is demanded - Google Patents

Abstract

The method involves driving a motor vehicle by an electrical machine, and switching on an operating unit i.e. internal combustion engine, of the motor vehicle based on a demand (11) of the motor vehicle. A time point (20), in which a request for switching operation unit is demanded, where the time point is determined based on a charging condition of an energy storage device i.e. battery, of the motor vehicle. The time point is determined based on traffic conditions and lane characteristics. An air/fuel mixture of the operating unit is preadjusted up to the time point.

Description

The invention relates to a method for operating a motor vehicle according to the preamble of claim 1 and a motor vehicle according to the preamble of claim 13.

Such cars and methods are well known. So revealed the DE 101 49 905 A1 a control system for the powertrain of a hybrid electric vehicle with a drive train source, which consists of an internal combustion engine and an electric motor. An anticipation strategy is provided which consists of a mathematical function of a predetermined set of system variables in which the driver request is anticipated. The strategy is to avoid unpredictable or undesirable starting of the internal combustion engine by anticipating the need for the vehicle's internal combustion engine.

From the DE 10 2005 031 307 A1 a method for operating a vehicle is known, wherein the vehicle has an internal combustion engine, an electric machine and an energy storage device. The method provides that an engine parameter is adjusted to cause an increase in the temperature of a catalyst when the engine is operating, thereby reducing the time required to reach a catalyst temperature. be reduced in emissions. In addition, it is provided to operate the internal combustion engine such that the engine output power is generally constant when an output power of the energy storage device is within a first predetermined range. It is further contemplated that at least one engine parameter is adjusted in a manner that changes the engine output when the output of the energy storage device is outside the first predetermined range, wherein the at least one engine parameter is adjusted to reflect a change in the output of the energy storage device from outside the first predetermined one To facilitate area in the first predetermined area.

The EP 1 223 323 A2 discloses a method of operating a vehicle having an internal combustion engine, wherein the internal combustion engine is operated when a temperature of an associated catalyst has been lowered below a predetermined lower limit even while a predetermined condition of the vehicle is satisfied. At this time, the catalyst maintains an exhaust gas purifying capability at a temperature above the predetermined lower limit.

From the EP 1 932 740 A1 is a hybrid vehicle with an internal combustion engine and an electric motor is known, which is powered by a rechargeable electric storage with electrical energy. In addition, the hybrid vehicle includes a device that generates electric power by utilizing an output of the internal combustion engine and that conducts the generated electric power to the electric storage. Also, means are provided which receives electric power, namely such electric power, which is applied outside the vehicle to charge the electric storage.

In addition, a controller is provided which controls an amount of charge supplied from the said electric-power-generating device to the electric storage such that a state of charge of the electric storage is set within a prescribed range or at a predetermined target value.

Furthermore, position detection means are provided which detect a current position of the hybrid vehicle. Further, the hybrid vehicle includes setting means for setting a limit value that sets the prescribed range or the target value lower when the travel distance is shorter from the current position detected by the position detecting means to a predetermined charging point.

From the EP 0 739 772 A1 For example, a control system for controlling a device that generates electrical power is known, wherein the system includes an electric generator and is installed in a hybrid vehicle having an electric motor for driving the hybrid vehicle. The electric motor derives its power from a battery and from an internal combustion engine. The control system uses a fuzzy logic to determine the extent of use of the electric generator.

From the EP 0 511 654 A2 For example, there is known a driving apparatus for a vehicle which includes an engine serving as a driving source of the vehicle, wherein an internal combustion engine is provided to supply the engine with electricity. In the driving device heating elements are provided, which use regenerated electricity of the engine to heat the engine.

The DE 10 2008 003 076 A1 discloses a method for controlling a hybrid vehicle having an internal combustion engine and an electric vehicle A propulsion system, wherein the method provides a driving force to the vehicle by the electric propulsion system. In addition, a time is determined which has elapsed since the internal combustion engine was last operated. Furthermore, the internal combustion engine is operated on the basis that the elapsed time is greater than a predetermined value.

From the EP 0 922 600 A2 For example, there is known a control system for starting an internal combustion engine of a hybrid vehicle in which a decision means is provided which determines a request for starting the internal combustion engine. In addition, adjusting means are provided which increase the output torque of an electric motor of the hybrid vehicle when the request to start the internal combustion engine is set by the decision means.

From the US 2008/0258474 A1 An apparatus for starting an internal combustion engine of a hybrid vehicle is known, which comprises an engine rotational speed control device which adjusts the rotational speed of the internal combustion engine during a shift of the hybrid vehicle.

The US 2003/0015358 A1 describes a hybrid vehicle having means by which a battery of the hybrid vehicle is rechargeable from an external power source and a navigation system having maps and recognizing the current position of the hybrid vehicle. In addition, a controller is provided which registers a point at which the external power source is installed in the map material as a base point. In addition, the control means registers an electric operating range of the hybrid vehicle whose center is the above-mentioned base point, this electric operating range being based on a state of charge of a battery of the hybrid vehicle. If the hybrid vehicle is approaching the base point from outside the electrical operating range, the controller increases the state of charge of the battery in advance while the hybrid vehicle is operating and before reaching the electrical operating range. When the hybrid vehicle reaches the electrical operating range, the control device switches over to this electrical operating range.

From the DE 103 60 478 A1 For example, a control device for motor vehicles having an engine that can be driven coupled to an internal combustion engine is known. In addition, a torque converter for transmitting drive torques from the engine and the engine to a downstream side of a powertrain and a transmission mechanism for changing the drive torque transmitted via the torque converter to a speed for transmitting to the drive wheels is provided the control device comprises a motor control device for controlling a driving state of the engine. In addition, the control device includes an engine control device for controlling a driving state of the internal combustion engine and a torque control device for outputting a torque reduction command for controlling a drive torque of the engine in such a manner as to set it within the maximum input torque of the transmission mechanism based on a torque ratio of the torque converter is calculated when the engine control means causes the engine to start driving after the engine control means has caused the engine to start driving.

The known methods and devices all have the disadvantage that the corresponding internal combustion engine is at a specific starting derselbigen in a state in which it has increased emissions and increased fuel consumption.

It is therefore an object of the present invention to develop a method for operating a motor vehicle and a motor vehicle of the type mentioned in such a way that improved emission levels are possible.

This object is achieved by a method for operating a motor vehicle having the features of patent claim 1 and by a motor vehicle having the features of patent claim 13. Advantageous embodiments with expedient and non-trivial developments of the invention are specified in the dependent claims.

An inventive method for operating a motor vehicle, in particular a hybrid vehicle, in which the motor vehicle is driven by at least one electric machine and at least one further operating unit, in particular an internal combustion engine, of the motor vehicle is switched on at least in response to a request of the motor vehicle, is provided thereby in that a point in time at which the request requires the activation of the further operating unit, in particular of the internal combustion engine, is determined in advance. By the advance determination of this time so a period of time is known, which results from just this time and a current time. This period is now known and can be used to components assigned to further operating unit up to the determined point in time, ie to which the further operating unit is switched on, as well as to put the further operating unit itself into operational readiness or to prepare it for it.

As a result, therefore, the further operating unit and the components assigned to it are ready for operation without or with only very slight restrictions, as a result of which energy consumption can be kept to an extremely low level by efficient operation of the further operating unit which is available on a quasi-ad hoc basis. This is especially true when the further operating unit is designed as an internal combustion engine. This then applies to the fuel consumption and emissions of the internal combustion engine. This means that the further operating unit does not have to be started first and must remain switched on for a while in order to achieve the efficient and, in the case of an internal combustion engine, low-emission and fuel-efficient operating point or operating state. Rather, she takes this directly when switching on.

Likewise, it is then possible, at least in the short term, to provide sufficiently high torque and high power immediately after switching on the further operating unit, and thus, if appropriate, at least proportionally for the motor vehicle, ie. H. So if necessary, in addition to the electric machine to drive and / or to charge an energy storage device such as a battery.

As known in conventional vehicles, a first start of an internal combustion engine in a motor vehicle is carried out directly at the request of the driver, ie immediately after the driver has initiated the starting process. Initially, a starter associated with the internal combustion engine is controlled and the internal combustion engine is towed at approximately 200 to 300 revolutions per minute. Subsequently, it is injected as soon as possible and ignited. The internal combustion engine is operated as a precontrol until all its associated, necessary components that are more or less relevant for their operation, are ready for operation. The internal combustion engine goes into a kind of test cycle in order to achieve a low-emission operation or operating point as quickly as possible. As part of this test cycle, necessary adaptations will be carried out.

When switching on or connection of the further operating unit, which is designed for example as an internal combustion engine, for example, to increase the range of a hybrid vehicle, which is driven exclusively by an electric machine (range extender), a speed of the above starter can be significantly increased and it It may be necessary that the internal combustion engine immediately has to deliver a very high power at increased speed. If the test cycle described above and / or the precontrol of the internal combustion engine is required, this would result in increased emissions and increased consumption or a delay in the provision of the power and the rotational speed.

This is avoided by the method according to the invention, since a point in time and thus a time span up to which the further operating unit must be switched on, that is to say a request of the motor vehicle whose activation is required, is determined in advance.

Such a requirement may be, for example, an operating state of the motor vehicle and / or a driver request, which the driver prescribes with an accelerator pedal, for example, and thus requests a certain torque of the at least one further operating unit. In this case, for example, such a request is detected and tracked over a certain time, whereupon the time at which the internal combustion engine or the further operating unit must be turned on, based on a past history of the request is determined in advance.

This prediction can be, for example, a kind of anticipation strategy which determines a progression of the at least one request in advance and thus concludes the time at which this request requires the involvement of the further operating unit.

It should be noted at this point that the at least one further operating unit does not necessarily drive the motor vehicle. It can also be switched on to drive an electric machine in the form of a generator, which in turn generates electricity, for example, to charge an energy storage device. This energy storage device, for example in the form of a battery, can deliver this generated electricity or its stored electrical energy, thus driving the or another electric machine in the form of an electric motor, which in turn drives the motor vehicle, and only. Thus, a serial hybrid vehicle is created, which is driven exclusively by means of at least one electric machine, wherein the at least one further operating unit acts as a range extender (range extender).

However, it is also possible that the at least one further operating unit the car proportionally, ie together with the electric Machine, or even completely alone drives, creating a parallel hybrid vehicle is created. In this case, therefore, the at least one further operating unit can drive the hybrid vehicle proportionally or completely by itself and at the same time or optionally also charge an energy storage device, for example in the form of a battery, the electrical energy of which can then be used to supply the one or the other to drive another electric machine.

In any embodiment of a hybrid vehicle, operating states occur in which the internal combustion engine has to be switched from a switched-off state, the method according to the invention finding application in order to achieve the described advantages.

In such a case, in any case, the further operating unit is then put into a ready-to-operate state in which it operates efficiently right from the beginning and is able to deliver high power and high rotational speeds.

In an advantageous embodiment of the invention it is provided that the time is determined in advance at least in dependence on a state of charge of an energy storage device, in particular a battery, of the motor vehicle. In this case, for example, a course of a removal of a memory content of the energy storage device is detected and observed and a state of the memory contents and thus the time ahead determined, to which the state of charge of the energy storage device requires the activation of the further operating unit. Thus, in the case of the abovementioned requirement, in dependence of which the activation of the further operating unit takes place, the state of charge of the energy storage device is concerned. By this embodiment, it is possible to recharge the state of charge of a battery of the motor vehicle by switching on the internal combustion engine and thus to increase a possible range of the motor vehicle. This energy storage device can also be, for example, a fuel content of a tank of the further operating unit in the form of an internal combustion engine.

A further advantageous embodiment of the invention provides that the time is determined in advance at least as a function of a driving distance of the motor vehicle. In this context, for example, a navigation system of the motor vehicle and a route planning by the driver resorted to the preceding route, so for example the distance, to use, in order to meet certain requirements of the motor vehicle, such as a necessary range, power or the like, which require switching on the further operating unit. Likewise, it may be possible to use a route already covered and observed over a certain period of time in order to determine the time in advance. This allows demand-based activation of the further operating unit, which at the time of its activation is able to deliver directly high speeds, high powers and high torques, and this with low consumption and low emissions.

If the time is determined in advance at least as a function of a traffic situation, this has the advantage that an even more dynamic and even more accurate prediction of the time at which the further operating unit must be switched on can take place. This therefore allows a targeted preparation of the further operating unit on their operation and a needs-based, targeted and thus energy-efficient displacement of the further operating unit associated components in their operational readiness. In this case, for example, data from the navigation system and route planning of the driver can also be used. Also possible is a use of data transfer, for example via General Packet Radio Service (GPRS) and / or Universal Mobile Telecommunications System (UMTS, 3G) or the like to obtain current traffic conditions. In this context, for example, a mobile phone, a radio (Traffic Message Channel - TMC) or the like can be used. Such components and data transmission standards are components and data transmission standards that are readily available today in a motor vehicle and thus can be used without much extra effort to predict the time at which the further operating unit must be turned on to achieve the advantages already described.

A further improvement of the dynamics and the accuracy of the prediction of the time described is achieved in that, in an advantageous embodiment of the invention, the time is determined at least in advance depending on a roadway course. Such a road course may be, for example, an incline or a gradient of the roadway on which the motor vehicle is driving or driving, or else the type of roadway, ie whether highway, motorway or the like. If, for example, a used map material of the above-mentioned navigation system of the motor vehicle indicates that there is a high proportion of downhill travel, then the conclusion can be drawn that it is not necessary to switch on the further operating unit since energy recuperation of braking energy can take place so that, for example, the To charge energy storage device. Switching on the further operating unit for charging the energy storage device or for increasing its memory content is therefore not necessary. If, on the other hand, it is determined that a large proportion of uphill travel is ahead, then the time at which the further operating unit must be switched on is imminent. In every respect, this embodiment means an even more needs-based and targeted predetermination and thus willingness dislocation of the further operating unit or the components associated therewith.

As already indicated, the time can advantageously also be determined in advance at least as a function of a roadway type. This means, for example, a highway, a highway, a city drive or the like, from which an expected speed or average speed and an expected power requirement and thus a power requirement of the motor vehicle can be determined in advance, which in turn allows conclusions about the necessary switching on the other operating unit. Especially in the case of city traffic, this makes it possible to achieve the lowest possible energy consumption of the further operating unit and of the motor vehicle as a whole.

In a particularly advantageous embodiment of the invention, it is provided that the time is determined in advance, at least as a function of energy consumption of at least one auxiliary unit of the motor vehicle. In such an auxiliary unit may be, for example, a seat heating, air conditioning or automatic air conditioning, a heated rear window or the like. This not only allows, as already described above, the further operating unit immediately assumes an efficient operating state when it is switched on, but that at the same time all possible comfort and / or safety functions for the driver of the motor vehicle are available in a needs-based manner and Way, which can reduce energy consumption and thus energy consumption of the motor vehicle due to the needs-based determination of the need of the respective auxiliary unit. In general, the inventive method allows a high level of comfort of the vehicle, since a noise of switching on the further operating unit can be reduced if this is already in an operational state, for example at a certain operating temperature.

Another comfort-related aspect of the invention is that the further operating unit can be switched on uniformly by the method according to the invention, which in turn gives the driver a uniform, comfortable driving feel of the entire motor vehicle, resulting in a high sense of value for the car.

The said energy consumption of the at least one accessory can advantageously be determined in advance. For example, an estimation can be made from a previous course. It is also possible to read the energy consumption from maps or the like and thus to determine in advance. This allows an even higher precision of the advance determination of the time at which the further operating unit must be turned on.

If the time is now determined in advance in the context of the method according to the invention, then it is extremely advantageous if at least one, in particular all, of the further operating unit assigned actuator is placed in its operational readiness up to the previously determined time. Such an actuator may be, for example, a throttle valve, a valve control (valve lift and / or valve timing) or the like. The transfer to the operating state means, for example, that corresponding control units are switched on and, if appropriate, a test run is carried out for diagnosis. This makes it possible for a control or regulation of these actuators to take place at the time of switching on the further operating unit, as a result of which the energy consumption of the further operating unit can be reduced.

In this case, for example, the throttle valve can be adjusted to a specific opening angle in order to provide a specific torque immediately after switching on the internal combustion engine. Thus, a very comfortable switching without jerking is possible because appropriate adaptations do not have to be performed after switching on, but they were already performed before switching on and thus the internal combustion engine or the further operating unit is placed in an operational state.

A further advantageous embodiment of the invention provides that at least one, in particular all, of the further operating unit associated sensor is placed in its operational readiness until the previously determined time. Such a sensor may, for example, be an air mass sensor, for example in the form of a hot-film air mass meter (HFM), a lambda probe or the like.

In particular, the displacement of the lambda probe and the air mass sensor in operational readiness are important measures for a regulation of the further operating unit in the form of Internal combustion engine, in order to realize an efficient operation derselbigen for representing a certain torque at the same time low emissions by adjusting a fuel-air mixture, and this immediately after switching on the internal combustion engine.

Just the setting of a correct fuel-air mixture, for example, at a lambda value of 1 (stoichiometric mixture), requires an operational lambda probe. This is the case if the lambda probe is brought to its operating temperature by means of corresponding heating elements, which is made possible by the method according to the invention. But other sensors that require, for example, a certain operating temperature or require a certain flow in the sense of startup, can be set by the inventive method in their operational readiness, whereby an efficient operation of the other operating unit is possible.

At this point it should be noted that the putting into operational readiness, for example in the sense of a startup, also applies readily to control devices such as an engine control unit.

In any case, the advance determination of the time at which the further operating unit has to be switched on, allows the systems required for regulation of the further operating unit to be put into operational readiness and thus immediate readiness of the same at the time determined beforehand, thus resulting in consumption, emissions - And comfort optimal start and operation of the other operating unit is possible.

An embodiment of the invention, which advantageously makes it possible, in particular to keep the emissions of the further operating unit in a small framework, is that an exhaust aftertreatment device of the motor vehicle is set to its operating temperature up to the previously determined time. If such an exhaust aftertreatment device is, for example, an oxidation catalytic converter, then it is generally known that such an oxidation catalytic converter requires a specific temperature in order to purify the exhaust gas, ie a conversion of the emissions such as hydrocarbons (HC), carbon monoxide (CO) and nitrogen oxides ( NO _x ). This temperature is the so-called conversion temperature (light-off temperature), to which the exhaust aftertreatment device can be set and adjusted by predetermining the time and thus the time span within the scope of the method according to the invention. Thus, a cleaning of the exhaust gas of the internal combustion engine can take place immediately at the time of its start. A heating of the oxidation catalyst by fuel injection, as it is known for example in a warm-up of an internal combustion engine in a conventional vehicle is not required.

This warming up of the exhaust-gas aftertreatment device can take place, for example, by means of at least one heating element, by means of which the exhaust-gas aftertreatment device is brought to its operating temperature up to the determined point in time.

In a further, particularly advantageous embodiment of the invention, it is provided that a mixture, in particular a fuel-air mixture, of the further operating unit is preset up to the time determined in advance. This presetting can be done, for example, such that the throttle valve is adjusted to a certain opening angle and / or an amount of fuel that is supplied to the operating unit in the form of the internal combustion engine, calculated in advance and, for example, already kept. This supply can be done for example via a suction pipe or via a direct injection. The presetting of the mixture allows a provision of a certain power or a certain torque of the internal combustion engine immediately after the start or at the start derselbigen and thus at the previously determined time, whereby an on-demand provision of this moment and a comfortable switching on the internal combustion engine is realized.

It should be noted at this point that the internal combustion engine as a further operating unit can be both a gasoline engine and a diesel engine or any kind of internal combustion engine. The type of internal combustion engine can have an effect on the type and / or number of actuators and / or sensors associated therewith.

The invention also relates to a motor vehicle, in particular a hybrid vehicle, with at least one electric machine, by means of which the motor vehicle is at least partially driven, and with at least one further operating unit, in particular an internal combustion engine, which by means of a control device of the motor vehicle, at least in response to a Requirement of the motor vehicle is switched on, which is provided according to the invention that by means of the control device, a time at which the request requires the involvement of the further operating unit, in particular the internal combustion engine, can be determined in advance. Advantageous embodiments of the Method are to be regarded as advantageous embodiments of the motor vehicle and vice versa.

On the motor vehicle according to the invention, the advantages already described in connection with the method according to the invention fully apply as well. By the advance determination of the time so the other operating unit is at this time or at the end of the period described above in standby, resulting in a comfortable switching on or switching this and a needs-based, low energy consumption and low-emission operation this results in simultaneous, immediate and needs-based representation of a corresponding moment and a power.

In an advantageous embodiment of the motor vehicle, it is provided that the motor vehicle has at least one energy storage device, in particular a battery, whose storage contents can be filled by means of the further operating unit. Thus, the motor vehicle according to the invention can thus be a serial, parallel and a plug-in hybrid vehicle, in which the further operating unit can drive the hybrid vehicle at least proportionally or is merely intended to fill the memory contents of the energy storage device (to charge the battery). In the latter case, the motor vehicle is driven only by the electric machine, which in turn draws its required electrical energy from the energy storage device (battery). In this case, the advance determination of the time allows a demand-based filling of the memory contents of the energy storage device. This allows a particularly energy-efficient and thus very efficient operation of the motor vehicle according to the invention.

Further advantages, features and details of the invention will become apparent from the following description of a preferred embodiment and from the drawing. The features and feature combinations mentioned above in the description as well as the features and combinations of features shown below alone in the description of the figures and / or in the figure can be used not only in the respectively indicated combination but also in other combinations or alone, without the scope of the invention to leave.

The figure shows a schematic representation of a course of a request of a hybrid vehicle, which is driven by an electric machine and in which an internal combustion engine is turned on in response to this request, wherein a time at which the request requires the involvement of the internal combustion engine ahead is determined.

The figure shows a course 10 a request of a hybrid vehicle, which in a diagram 12 is shown. On the abscissa 14 of the diagram 12 while the time is plotted, while the ordinate 16 Representing the diagram represents a certain quantification of an amount of the request.

In the diagram 12 is also a limit 18 the requirement 11 entered.

The diagram 12 FIG. 3 illustrates a method for operating a hybrid vehicle in which the hybrid vehicle is driven by means of an electric machine and in which an internal combustion engine of the hybrid vehicle is dependent on the requirement 11 of the hybrid vehicle is turned on.

In the diagram 12 is one of the requirement 11 assigned limit 18 entered. Reaches or exceeds the requirement 11 the limit 18 so requires the requirement 11 a switching on the internal combustion engine. Such switching on of the internal combustion engine, in turn, generally requires operation and operational readiness of a plurality of sensors and actuators associated with the internal combustion engine, such as an operational lambda probe for monitoring exhaust gas composition, an operational mass air flow sensor for detecting an intake air quantity, an operational catalyst for Cleaning an exhaust gas of the internal combustion engine and so on. If now the internal combustion engine would be started without preparations and precautions, this would require an adaptation, for example, in the form of a warm-up of the internal combustion engine itself as well as the corresponding actuators and sensors. During these adaptations there would then be an increase in fuel consumption. In addition, the internal combustion engine could not provide a desired torque and power immediately at the time of its being turned on.

To solve these problems, it is now provided in the mentioned method that a time 20 where the request 11 requires the engagement of the internal combustion engine, is determined in advance, what by the dashed curve 22 of the course 10 the requirement 11 is indicated. To anticipate the time 20 for example, the history 10 the requirement 11 recorded and the future course 22 estimated, thereby reducing the time 20 is determined in advance.

That's the time 20 determines a time interval between a time 24 at which time 20 was determined and the time 20 itself available to put the described, the internal combustion engine associated actuators and sensors in operational readiness. This means, for example, that the lambda probe and the catalyst can be preheated. As a result, an optimal mixture formation and an exhaust gas purification immediately upon switching on the internal combustion engine, ie at the time 20 , whereby the internal combustion engine can record a low-consumption and low-emission operation immediately after being switched on, while at the same time providing a desired torque and a desired power at a desired rotational speed.

At the request 11 or the course 10 the requirement 11 it may be, for example, a driver request for a specific torque of the internal combustion engine or a state of charge of a battery associated with the electric machine or the like. It is likewise possible to take several requirements into account or to transfer several requirements into a single course, if appropriate with corresponding weightings, and to carry out the described method.

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

• DE 10149905 A1 [0002]
• DE 102005031307 A1 [0003]
• EP 1223323 A2 [0004]
• EP 1932740 A1 [0005]
• EP 0739772 A1 [0008]
• EP 0511654 A2 [0009]
• DE 102008003076 A1 [0010]
• EP 0922600 A2 [0011]
• US 2008/0258474 A1 [0012]
• US 2003/0015358 A1 [0013]
• DE 10360478 A1 [0014]

Claims (14)

Method for operating a motor vehicle, in particular a hybrid vehicle, in which the motor vehicle is driven by means of at least one electric machine and at least one further operating unit, in particular an internal combustion engine, of the motor vehicle at least in response to a request ( 11 ) of the motor vehicle, characterized in that a time ( 20 ), where the requirement ( 11 ) requires the involvement of the further operating unit, in particular the internal combustion engine, is determined in advance. Method according to claim 1, characterized in that the time ( 20 ) is determined at least in dependence on a state of charge of an energy storage device, in particular a battery, the motor vehicle ahead. Method according to one of claims 1 or 2, characterized in that the time ( 20 ) is determined in advance at least in dependence on a driving distance of the motor vehicle. Method according to one of the preceding claims, characterized in that the time ( 20 ) is determined in advance at least as a function of a traffic situation. Method according to one of the preceding claims, characterized in that the time ( 20 ) is determined in advance at least in dependence on a roadway course. Method according to one of the preceding claims, characterized in that the time ( 20 ) is determined at least in dependence on a roadway type ahead. Method according to one of the preceding claims, characterized in that the time ( 20 ) is determined in advance at least as a function of energy consumption of at least one accessory of the motor vehicle. A method according to claim 7, characterized in that the energy consumption is determined in advance. Method according to one of the preceding claims, characterized in that up to the previously determined time ( 20 ) is placed at least one of the further operating unit associated actuator in its operational readiness. Method according to one of the preceding claims, characterized in that up to the previously determined time ( 20 ) at least one of the further operating unit associated sensor is placed in its operational readiness. Method according to one of the preceding claims, characterized in that up to the previously determined time ( 20 ) At least one exhaust aftertreatment device of the motor vehicle is set to its operating temperature. Method according to one of the preceding claims, characterized in that up to the previously determined time ( 20 ) a mixture, in particular a fuel-air mixture, the further operating unit is preset. Motor vehicle, in particular hybrid vehicle, with at least one electric machine, by means of which the motor vehicle is at least partially driven, and with at least one further operating unit, in particular an internal combustion engine, which by means of a control device of the motor vehicle at least in response to a request ( 11 ) of the motor vehicle, characterized in that by means of the control device a time ( 20 ), where the requirement ( 11 ) requires the involvement of the further operating unit, in particular the internal combustion engine, can be determined beforehand. A motor vehicle according to claim 13, characterized in that the motor vehicle at least one energy storage device, in particular a battery, whose memory contents can be filled by means of the further operating unit.

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