Method for initiating a defrosting process of a heat exchanger of a heat pump of a motor vehicle
A method for initiating a defrosting process of a heat exchanger of a heat pump of a motor vehicle, wherein a fan is assigned to the heat exchanger, wherein the power consumption and/or the speed of the fan is monitored, a defrosting process is initiated when the power consumption and/or the speed exceeds and/or falls below a threshold value, and the threshold value is determined as a function of a parameter, wherein the parameter is an indicator of a current relative air speed of the ambient air in relation to the motor vehicle.
1. A method for initiating a defrosting process of a heat exchanger of a heat pump of a motor vehicle, wherein a fan is assigned to the heat exchanger, comprising:
monitoring the power consumption and/or the speed of the fan, and
initiating a defrosting process one or both of the power consumption and/or the speed of the fan exceeds and/or falls below a threshold value,
wherein the threshold value is determined as a function of a parameter which is an indicator of a current relative air speed of ambient air in relation to the motor vehicle,
wherein the threshold value is further determined as a function of the dew point temperature of the air at the heat exchanger, and/or
wherein the defrosting process is only initiated when the temperature of the air at the heat exchanger falls below the dew point temperature.
2. The method according to claim 1 , wherein the parameter is the current driving speed of the motor vehicle.
3. The method according to claim 1 , wherein the parameter is the wind speed and/or the wind direction.
4. The method according to claim 1 , wherein the parameter is a distance signal.
5. The method according to claim 4 , wherein the distance signal is the distance value of the motor vehicle in relation to a vehicle traveling in front of the motor vehicle.
6. The method according to claim 4 , wherein the vehicle position is a position of the motor vehicle in a road tunnel, in a valley, or in a street canyon.
7. The method according to claim 1 , wherein the parameter is a vehicle position.
8. The method according to claim 1 ,
wherein the threshold value is further determined as a function of the air density and/or of the outside air temperature and/or the outside air humidity, and/or
wherein the parameter is an opening degree of a radiator shutter.
9. The method according to claim 1 , wherein the fan is operated for a period of time of less than one minute at an increased or a decreased speed to determine whether a defrosting process should be initiated.
10. The method according to claim 1 , wherein the method is carried out when the motor vehicle is stationary.
11. The method according to claim 1 , wherein the motor vehicle is an electric vehicle, a battery-electric vehicle or a hybrid electric vehicle.
12. A motor vehicle comprising:
a device for defrosting a heat exchanger of a heat pump of the motor vehicle, and
a fan assigned to the heat exchanger,
wherein the device has a computing unit that is configured to carry out the method according to claim 1 for initiating a defrosting process of the heat exchanger.