DE102021201614A1 - Method for automatically switching between driving modes of a vehicle - Google Patents

Abstract

Method for automatically switching between driving modes of an electrically drivable vehicle, comprising the following steps:a) continuous detection of a speed variable that represents a current speed of the electrically drivable vehicle;b) continuous detection of a rotary handle position variable that represents a current rotary handle position of the electrically drivable vehicle;c ) determining a rotary handle position gradient of the detected rotary handle position variables for a predetermined period of time;d) comparing the rotary handle position gradient with at least one predetermined target rotary handle position gradient;e) switching to another driving mode of the electrically driven vehicle depending on the comparison;

Description

The invention is based on a method for automatically switching between driving modes of a vehicle, in particular one that can be driven electrically, a device for operating a vehicle, a computer program and use of the device according to the preamble of the independent claims.

State of the art

In 48V systems for light electric vehicles, there is a corresponding torque map for each driving mode, for example for an energy-saving driving style ("Eco"), for a driving style designed for longer journeys ("Cruise") and for a sporty driving style ("Sport") . The vehicle speed and the position of the twist grip are input variables and the driver's desired torque is the output variable of the individual torque characteristic diagrams. Switching between the individual driving modes is currently carried out at the request of the driver of an electric vehicle by actuating a physical switch.

Currently, the driver of an electric vehicle must actively change the driving mode by operating the physical switch in order to obtain higher power or torque, for example to switch from the "Eco" torque map to the "Cruise" torque map. During an overtaking manoeuvre, i.e. in particular when the driver demands increased power, manual switching to the next more powerful mode is perceived as annoying. Furthermore, manual upshifting wastes valuable time, which can ultimately be decisive when overtaking.

The document DE 10 2014 215 259 A1 discloses a method and a device for automatically selecting a driving mode on a motor vehicle while driving along a route.

The document U.S. 2015 314 771 A1 discloses a cruise control system and method for a hybrid electric vehicle, the vehicle having a motor, an electric machine, and a mode switch to enable switching between a first cruise control mode and a second cruise control mode.

It is the object of the present invention to further improve the state of the art. This object is solved by the features of the independent claims.

Disclosure of Invention

Advantages of the Invention

1. a) Fortlaufendes Erfassen einer Geschwindigkeitsgröße, die eine momentane Geschwindigkeit des Fahrzeugs repräsentiert;
2. b) Fortlaufendes Erfassen einer Drehgriffstellungsgröße, die eine momentane Drehgriffstellung des Fahrzeugs repräsentiert;
3. c) Bestimmen eines Drehgriffstellungsgradienten der erfassten Drehgriffstellungsgrößen für eine vorgegebene Zeitdauer;
4. d) Vergleichen des Drehgriffstellungsgradienten mit mindestens einem vorgegebenen Soll-Drehgriffstellungsgradienten;
5. e) Umschalten auf einen anderen Fahrmodus des Fahrzeugs in Abhängigkeit des Vergleichs.

The procedure according to the invention with the characterizing features of the independent claims has the advantage that the method for automatically switching between driving modes of a vehicle, in particular one that can be driven electrically, comprises the following steps:

1. a) continuous detection of a speed variable that represents a current speed of the vehicle;
2. b) continuously detecting a rotary handle position variable which represents a current rotary handle position of the vehicle;
3. c) determining a twist grip position gradient of the detected twist grip position variables for a predetermined period of time;
4. d) comparing the rotary handle position gradient with at least one predetermined target rotary handle position gradient;
5. e) switching to another driving mode of the vehicle depending on the comparison.

As a result, an automatic switching between driving modes can advantageously take place as a function of the twist grip position gradient.

Further advantageous embodiments are the subject matter of the dependent claims.

Advantageously, a switch is made from a less powerful driving mode to a more powerful driving mode of the vehicle, in particular one that can be driven electrically. This automatically switches to the next higher, more powerful driving mode, for example from the "Eco" driving mode to the "Cruise" driving mode, as soon as the twist grip position gradient exceeds a specified twist grip position gradient, which means that more vehicle power is available for overtaking in a shorter time. In addition to increased driving pleasure, an improvement in safety aspects is achieved. Furthermore, there is no longer a perceived long waiting time with the conventional "kick-down".

The more powerful driving mode is advantageously retained. The retention of the more powerful driving mode is implemented, for example, via an RS flip-flop.

A device for operating a vehicle advantageously includes at least one means, in particular an electronic control unit, which is set up to carry out the steps of the method according to the invention.

A computer program according to the invention advantageously includes commands which cause the device for operating an electrochemical energy storage unit to carry out the method steps according to the invention for automatically switching between driving modes of a vehicle, in particular one that can be driven electrically.

A machine-readable storage medium is advantageously provided, on which the computer program is stored.

The diagnostic device is advantageously used for electric vehicles, fuel cell vehicles, hybrid vehicles, plug-in hybrid vehicles, aircraft, pedelecs or e-bikes and electric hand tools.

character list

Embodiments of the invention are shown in the drawing and explained in more detail in the following description.

• 1 ein Ablaufdiagramm einer Ausführungsform eines erfindungsgemäßen Verfahrens; und
• 2 eine schematische Darstellung eines Signalflussplans eines erfindungsgemäßen Verfahrens.

Show it:

• 1 a flowchart of an embodiment of a method according to the invention; and
• 2 a schematic representation of a signal flow plan of a method according to the invention.

The same reference symbols designate the same device components in all figures.

1 shows a flowchart of an embodiment of a method according to the invention. In step 101, a speed variable is continuously recorded, which represents a current speed of a vehicle, in particular one that can be driven electrically.

In step 102, a rotary handle position variable is continuously recorded, which represents a current rotary handle position of the vehicle.

In step 103, a rotary handle position gradient of the detected rotary handle position variables is determined for a predetermined period of time.

In step 104, the determined twist grip position gradient is compared with at least one predetermined target twist grip position gradient. If the rotary handle position gradient is below the specified target rotary handle position gradient, the method then continues in step 101 . If the twist grip position gradient exceeds the specified target twist grip position gradient, then in step 105 the driving mode of the vehicle is switched over.

2 shows a schematic representation of a signal flow plan of a method according to the invention. A difference is formed in block 205 from a rotary handle position variable 200 recorded last, which represents a historical rotary handle position of a particularly electrically driven vehicle, with a currently recorded rotary handle position variable 201, which represents a current rotary handle position of the vehicle.

In block 208 a rotary handle position gradient is determined from an absolute value 206 of the difference and a predetermined time period 207 .

In block 210 the twist grip position gradient is compared to a target twist grip position gradient 209 and the result, which represents an automatic switching between driving modes of the vehicle, is fed to a block 212 .

In block 212, the automatic switching between driving modes is linked to a signal 211, which represents a manual switching of the driving modes by a driver of the vehicle using a physical switch, and the result is fed to a block 213.

The currently detected rotary handle position variable 201 and a speed variable 202, which represents an instantaneous speed of the vehicle, are torque characteristics 203, 204 supplied. In the embodiment shown, torque characteristic diagram 203 includes the torque characteristic curve for an “eco” driving mode, and torque characteristic diagram 204 in the illustrated embodiment includes the torque characteristic curve for a “cruise” driving mode.

In block 213, depending on the automatic and/or manual switchover of the vehicle's driving modes, a corresponding torque map is selected and a desired driver's desired torque is output in block 214. For example, if the rotary grip position gradient exceeds the setpoint rotary grip position gradient 209, the driver's desired torque is output from the torque map 204 and thus automatically switched between the "Eco" driving mode and the "Cruise" driving mode depending on the rotary grip position gradient.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 102014215259 A1 [0004]
• US2015314771A1 [0005]

Claims (6)

Method for automatically switching between driving modes of a vehicle, in particular one that can be driven electrically, comprising the following steps: a) (101) continuously detecting a speed variable which represents a current speed of the vehicle; b) (102) continuously detecting a twist grip position variable representing a current twist grip position of the vehicle; c) (103) determining a rotary handle position gradient of the detected rotary handle position variables for a predetermined period of time; d) (104) comparing the twist grip position gradient with at least one predetermined target twist grip position gradient; e) (105) switching to another driving mode of the vehicle depending on the comparison. Method for automatically switching between driving modes of a vehicle according to claim 1 , switching from a less powerful driving mode to a more powerful driving mode of the vehicle. Device for operating a vehicle comprising at least one means, in particular an electronic control unit, which is set up to carry out the steps of the method according to one of Claims 1 until 2 to perform. A computer program comprising instructions that cause the device to operate an electrochemical energy storage device according to claim 3 the process steps according to one of Claims 1 until 2 executes Machine-readable storage medium on which the computer program claim 4 is saved. Use of a device for operating a vehicle according to claim 3 for electric vehicles, fuel cell vehicles, hybrid vehicles, plug-in hybrid vehicles, aircraft, pedelecs or e-bikes, mopeds and electric hand tools.

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