Method and device for the operation of a motor vehicle

1. A method for the operation of a motor vehicle having a first drive motor, comprising:

autonomously switching-off of the first drive motor independently from an intentional switching-off of the first drive motor by a driver of the motor vehicle; and

operating an electrical consumer of the first drive motor in an energy-saving mode,

wherein

outside the energy-saving mode, the electrical consumer is operated with a prescribed heat output, and

inside the energy-saving mode, the electrical consumer is operated with a reduced heat output compared to the prescribed heat output.

2. The method as claimed in claim 1 , wherein the first drive motor is switched off autonomously if the first drive motor is operated in neutral and the motor vehicle's wheels are stationary.

3. The method as claimed in claim 2 , wherein the motor vehicle further comprises a second drive motor and the first drive motor is switched off autonomously if a second drive motor of the motor vehicle is started.

4. The method as claimed in claim 1 , wherein the electrical consumer comprises a sensor.

5. The method as claimed in claim 4 , wherein the reduced heat output of the sensor is selected such that in the energy-saving mode, a temperature of the sensor lies in the range of an activation temperature of the sensor.

6. The method as claimed in claim 5 , wherein the sensor is a lambda probe.

7. The method as claimed in claim 6 , wherein the first drive motor is an internal combustion engine.

8. The method as claimed in claim 7 , wherein the second drive motor is an electric motor.

9. A device for controlling operation of a motor vehicle having a first drive motor, comprising:

a switch that autonomously switches-off a first drive motor independent from an intentional switching-off of the first drive motor by a driver of the motor vehicle; and

a controller that operates an electrical consumer of the first drive motor in an energy saving mode after the autonomous switching-off of the drive motor,

wherein

outside the energy-saving mode, the electrical consumer is operated with a prescribed heat output, and

inside the energy-saving mode, the electrical consumer is operated with a reduced heat output compared to the prescribed heat output.

10. The device as claimed in claim 9 , wherein the first drive motor is switched off autonomously if the first drive motor is operated in neutral and the motor vehicle's wheels are stationary.

11. The device as claimed in claim 10 , wherein the motor vehicle further comprises a second drive motor and the first drive motor is switched off autonomously if a second drive motor of the motor vehicle is started.

12. The device as claimed in claim 9 , wherein the electrical consumer comprises a sensor.

13. The device as claimed in claim 12 , wherein the reduced heat output of the sensor is selected such that in the energy-saving mode, a temperature of the sensor lies in the range of an activation temperature of the sensor.

14. The device as claimed in claim 13 , wherein the sensor is a lambda probe.

15. The device as claimed in claim 14 , wherein the first drive motor is an internal combustion engine.

16. The device as claimed in claim 15 , wherein the second drive motor is an electric motor.