DE102014211502A1 - Device and method for controlling a drive torque of a hybrid motor vehicle - Google Patents

Abstract

The present invention relates to a device for controlling a drive torque of a hybrid motor vehicle (100), the device comprising: a detection device (10) which is adapted to detect operating data of the hybrid motor vehicle (100) and geographical data; a computer device (20) which is designed to determine an acceleration function for the hybrid motor vehicle (100) on the basis of the acquired operating data and on the basis of the acquired geographical data; and a control device (30) which is designed to control the drive torque of an electric drive device (50) of the hybrid motor vehicle (100) on the basis of the determined acceleration function.

Description

Technical area

The present invention relates to a driver assistance system. In particular, the present invention relates to an apparatus and a method for controlling a drive torque of a hybrid motor vehicle.

Technical background

Motor vehicles and hybrid motor vehicles with a high flow resistance coefficient or with increased drag coefficients compared with other motor vehicles or with increased rolling friction compared to other motor vehicles, the driving function coasting, free coasting with the drive train not closed, is only possible to a limited extent. For example, SUVs have adopted a term "sport utility vehicle" (abbreviated SUV), for example, "sports and utility vehicle", due to acting forces such as rolling and friction forces opposing the moving mass of the motor vehicle or hybrid vehicle "), Or off-road sedans, only a low potential to activate the driving function" Coasting "for longer periods, as these vehicles lose speed very quickly. Thus, these motor vehicles flowing in traffic is not possible.

Disclosure of the invention

It is an object of the present invention to provide an improved coasting function for a motor vehicle or a hybrid motor vehicle.

This object is solved by the subject matters of the independent claims. Embodiments and further developments can be taken from the dependent claims, the description and the figures.

A first aspect of the present invention relates to a device for controlling a drive torque of a hybrid motor vehicle, the device comprising: a detection device configured to detect operation data of the hybrid vehicle and geographical data; a computer device which is designed to determine an acceleration function for the hybrid motor vehicle on the basis of the acquired operating data and on the basis of the acquired geographical data; and a control device, which is designed to control the drive torque of an electric drive device of the hybrid motor vehicle based on the determined acceleration function.

According to a further aspect of the present invention, a method is provided, the method comprising the following method steps: detection of operating data of the hybrid motor vehicle and of geographical data by means of a detection device; Determining an acceleration function for the hybrid motor vehicle on the basis of the acquired operating data and on the basis of the acquired geographical data by means of a computer device; and controlling a drive torque of an electric drive device of the hybrid motor vehicle based on the determined acceleration function by means of a control device.

Advantageous embodiments of the present invention are characterized in the subclaims.

The present invention is characterized in that it is possible in motor vehicles or hybrid vehicles, which are due to their structure, during the drive to decouple the engine from the rest of the drive unit about a clutch or an automatic transmission, continue to roll without own propulsion ,

The present invention advantageously makes it possible for motor vehicles or hybrid motor vehicles to optionally switch off the internal combustion engine or to continue operating it at idle.

The term "coasting" as used by the present invention includes, for example, a so-called start-stop coasting with the internal combustion engine switched off or idle coasting with the internal combustion engine running.

The present invention advantageously enables the coasting to be assisted by the engagement and the motor torque of an electric motor. The torque of the electric motor, which can act directly or indirectly on the drive unit, the support of the speed during the Coasting phase is supported or counteracted the deceleration during the Coasting phase.

In other words, the present invention enables the motor vehicle or the hybrid vehicle to be decelerated to a reduced extent by an improved control based on the detected acceleration function.

With an active intervention of the electric motor or in other words by means of a weak energization of the electric motor, the motor torque of the electric motor is supported and the speed during the Coasting phase held over a prolonged period. The speed is held constant, maintained at a value in accordance with a predetermined velocity profile (eg, a rate of change), or maintained within a velocity range, such as defined by upper and lower limits or defined by upper and lower bounds. Gradients can generally be defined by rates of change and / or breakpoints.

The present invention advantageously makes it possible for a coasting phase of the motor vehicle to be imitated with a lower rolling or CW value in comparison with the actually present rolling or CW value. The forces counteracting the further coasting movement during travel of the motor vehicle are compensated or at least reduced.

The present invention advantageously makes it possible for a coasting phase to be extended on account of the drive torques of the electric motor.

Advantageously, the present invention makes it possible for the motor vehicle to be driven independently of the internal combustion engine, such as in the case of an electric motor which can be coupled in on a different drive axle than the internal combustion engine. Furthermore, this can also be made possible by a separate penetration of the electric motor on the same drive axle as used by the internal combustion engine.

Advantageously, the present invention allows that, if the internal combustion engine can be decoupled via a clutch from the rest of the drive unit, the vehicle is driven with a certain drive torque of the electric motor. In this case, the drive motor of the electric motor is calculated such that the occurring force acts on the drive train in such a way that a desired deceleration curve occurs.

These required forces, which are applied by the drive torque of the engine in conjunction with an optional transmission ratio, are calculated on the basis of the friction and rolling friction values as a function of the vehicle structure and the vehicle characteristics. These include above all the CW value, the current weight of the motor vehicle, friction in the drive train and other influences. Additional input information is road and route data that influences the roll behavior during the coasting phase, such as geodata or slope data, road condition data, or data about existing curve radii or other data.

Advantageously, the electric motor can be powered by a battery that can be recharged during the remaining driving phases. This can be done during a so-called recuperation phase, such as during braking, or via a load point shift. The use of the electric motor can be planned in advance via the forecast of the route characteristics. Thus, the respective speed and thus the necessary support of the electric motor torque can be calculated in advance over each time of the route.

Advantageously, the present invention allows a saving in fuel consumption of more than 5 g CO ₂ / km for the respective motor vehicle, in comparison with the fuel consumption of a corresponding motor vehicle without sailing function, ie without Coasting mode.

In an advantageous embodiment of the present invention, it is provided that the detection device is designed to record as the operating data of the hybrid vehicle data about a flow resistance coefficient or a drag coefficient or a weight or a friction value or a rolling friction value.

In an advantageous embodiment of the present invention, it is provided that the computer device is designed to determine the acceleration function for the hybrid motor vehicle on the basis of the acquired operating data and on the basis of the acquired geographical data and on the basis of data about a motor vehicle structure of the hybrid motor vehicle.

In an advantageous embodiment of the present invention, it is provided that the computer device is designed to determine the acceleration function for the hybrid motor vehicle on the basis of the acquired operating data and on the basis of the acquired geographical data and on the basis of data about a vehicle property of the hybrid motor vehicle.

In an advantageous embodiment of the present invention, it is provided that the control device is designed to control the drive torque of the electric drive device of the hybrid motor vehicle during a coastdown phase of the hybrid motor vehicle.

In a further advantageous embodiment of the present invention, it is provided that the computer device is designed to ascertain a gradient of a route of the hybrid motor vehicle on the basis of the acquired operating data and on the basis of the acquired geographical data and, based thereon, the acceleration function for the vehicle To determine hybrid motor vehicle. A route can be, for example, a driving route of the hybrid motor vehicle.

The described embodiments and developments can be combined with each other as desired.

Further possible refinements, developments and implementations of the invention also include combinations, not explicitly mentioned, of features of the invention described above or below with regard to the exemplary embodiments.

Brief description of the figures

The accompanying drawings are intended to provide further understanding of the embodiments of the invention. The accompanying drawings illustrate embodiments and together with the description serve to explain concepts of the invention.

Other embodiments and many of the stated advantages will become apparent with reference to the drawings. The illustrated elements of the drawings are not necessarily shown to scale to each other.

Show it:

1 a schematic representation of a device for controlling a drive torque of a hybrid motor vehicle according to an embodiment of the present invention;

2 a schematic representation of a flowchart of a method for controlling a drive torque of a hybrid motor vehicle according to another embodiment of the present invention; and

3 a schematic representation of a hybrid motor vehicle for explaining the invention.

Detailed description of embodiments

In the figures of the drawings, like reference characters designate like or functionally identical elements, components, components or method steps, unless indicated otherwise.

The 1 shows a schematic representation of a device for controlling a drive torque of a hybrid motor vehicle.

A device 1 includes, for example, a detection device 10 , a computer device 20 , and a controller 30 ,

The detection device 10 may be designed, for example, operating data of the hybrid motor vehicle 100 and to collect geographic data.

The computer device 20 For example, it may be configured to perform an acceleration function for the hybrid vehicle based on the acquired operational data and on the acquired geographic data 100 to investigate.

Furthermore, the control device 30 be designed to, based on the determined acceleration function, the drive torque of an electric drive device 50 of the hybrid motor vehicle 100 to control.

The 2 shows a method for controlling a drive torque of a hybrid motor vehicle 100 ,

The method comprises, for example, the following method steps:
As a first method step, detection S1 of operating data of the hybrid motor vehicle takes place 100 and geographic data by means of a detector 10 ,

As a second method step, determination S2 of an acceleration function for the hybrid motor vehicle takes place based on the acquired operating data and on the basis of the acquired geographical data by means of a computer device 20 ,

As a third method step, a control S3 of an electric drive device takes place 50 of the hybrid motor vehicle 100 based on the determined acceleration function by means of a control device 30 ,

Furthermore, controlling the drive torque of an internal combustion engine drive device 60 of the hybrid motor vehicle 100 based on the determined acceleration function by means of a control device 30 respectively.

The 3 shows, for example, a hybrid motor vehicle to illustrate the invention.

The hybrid motor vehicle 100 has, for example, an electric drive device 50 and an internal combustion engine drive device 60 on.

The device 1 includes, for example, a detection device 10 , a computer device 20 , and a controller 30 and is with the electric drive device 50 and the internal combustion engine drive device 60 coupled.

Based on the recorded operating data and on the acquired geographical data is for the hybrid motor vehicle 100 determines an acceleration function.

The acceleration function can, for example, reproduce a time profile of the deceleration or the negative acceleration or a time profile of the speed of the hybrid motor vehicle.

In this case, a future time span of, for example, up to 20 s can be covered by the acceleration function. This advantageously allows the speed of the hybrid vehicle 100 at any time within the next 20 s if necessary to query.

Based on the determined acceleration function, the drive torque of the electric drive device 50 of the hybrid motor vehicle 100 to be controlled.

The term "coasting", as used by the present invention, for example, an engine shutdown of the motor vehicle or hybrid motor vehicle, in which an internal combustion engine of the motor vehicle or hybrid vehicle is disconnected and / or turned off and further, for example by disconnecting a drive train of the motor vehicle or Hybrid vehicle braking torques are avoided and the vehicle retains its speed only by the inertia of the mass of the motor vehicle or hybrid motor vehicle.

For example, this is in the 3 illustrated hybrid motor vehicle 100 on a hilltop and during a future period of, for example, 20 s within the environmental area U of the hybrid motor vehicle cover a distance of, for example, 1 km and thereby exceed, for example, a height difference of 200 vertical meters, the height difference being negative, that is the speed of the hybrid motor vehicle in Case of sailing or Coasting called, is increased.

In this case, height data or geographical data can be available which describe the absolute height information in the points A and B and, for example, a predominant gradient in the points A and B on the route of the motor vehicle.

The term "near-field information" as used by the present invention comprises, for example, by means of optical sensors or by means of other sensors resolvable topographical circumstances of the environment, for example up to 2 km of the motor vehicle.

Although the present invention has been described above with reference to preferred embodiments, it is not limited thereto but is modifiable in a variety of ways. In particular, the invention can be varied or modified in many ways without deviating from the gist of the invention.

It should be understood that "comprising" and "having" does not exclude other elements or steps, and "a" or "an" does not exclude a plurality.

It should also be appreciated that features or steps described with reference to any of the above embodiments may also be used in combination with other features or steps of other embodiments described above. Reference signs in the claims are not to be considered as limitations.

Claims (10)

Contraption ( 1 ) for controlling a drive torque of a hybrid motor vehicle ( 100 ), the device ( 1 ) comprises: a detection device ( 10 ), which is adapted to operating data of the hybrid motor vehicle ( 100 ) and to gather geographical data; A computer device ( 20 ), which is designed, based on the acquired operating data and based on the acquired geographical data, an acceleration function for the hybrid motor vehicle ( 100 ) to investigate; and a control device ( 30 ), which is designed, based on the determined acceleration function, the drive torque of an electric drive device ( 50 ) of the hybrid motor vehicle ( 100 ) to control. Apparatus according to claim 1, wherein the detection means ( 10 ) is designed as the operating data of the hybrid motor vehicle ( 100 ) Data on a drag coefficient or a drag coefficient or a weight or a friction value or a rolling friction value of the hybrid motor vehicle ( 100 ) capture. Device according to one of the preceding claims 1 or 2, wherein the computer device ( 20 ) is designed on the basis of the recorded operating data and the recorded geographical data and data on a vehicle structure of the hybrid motor vehicle ( 100 ) the acceleration function for the hybrid motor vehicle ( 100 ) to investigate. Device according to one of the preceding claims 1 to 3, wherein the computer device ( 20 ) is designed, on the basis of the recorded operational data and the recorded geographical data and on data relating to a vehicle characteristic of the hybrid motor vehicle ( 100 ) the acceleration function for the hybrid motor vehicle ( 100 ) to investigate. Device according to one of the preceding claims 1 to 4, wherein the control device ( 30 ) is adapted to the drive torque of the electric drive device ( 50 ) during a coasting phase of the hybrid motor vehicle ( 100 ) to control. Device according to one of the preceding claims 1 to 5, wherein the computer device ( 20 ) is designed, based on the acquired operating data and on the acquired geographical data, an incline of a route of the hybrid motor vehicle ( 100 ) and based thereon the acceleration function for the hybrid motor vehicle ( 100 ) to investigate. Method for controlling a drive torque of a hybrid motor vehicle ( 100 ), the method comprising the following method steps: detecting (S1) operating data of the hybrid motor vehicle ( 100 ) and geographic data by means of a detection device ( 10 ); Determining (S2) an acceleration function for the hybrid motor vehicle ( 100 ) based on the recorded operating data and on the acquired geographical data by means of a computer device ( 20 ); and - controlling (S3) the drive torque of an electric drive device ( 50 ) of the hybrid motor vehicle ( 100 ) based on the determined acceleration function by means of a control device ( 30 ). Method according to claim 7, wherein the hybrid motor vehicle ( 100 ) Data about a drag coefficient or a drag coefficient or a weight or a friction value or a rolling friction value are detected. Method according to claim 7 or 8, wherein based on the acquired operating data and on the acquired geographical data and on data about a vehicle structure of the hybrid motor vehicle ( 100 ) the acceleration function for the hybrid motor vehicle ( 100 ) be determined. Method according to one of the preceding claims 7 to 9, wherein on the basis of the acquired operating data and on the basis of the acquired geographical data and on the basis of data about a vehicle structure of the hybrid motor vehicle ( 100 ) the acceleration function for the hybrid motor vehicle ( 100 ) is determined.

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