Overview
This document contains information on:
General
Function requirements
Auxiliary climate control via unlocking the vehicle
Pre-air conditioning for departure time
Pre-entry climate control via pre-entry climate control button
Evaluation
Ventilation mode
Heating mode
Improve air quality (equipment-specific)
General
The vehicle interior of the parked vehicle can be pre-heated or pre-cooled as needed before starting a journey and, depending on the equipment, air quality can be improved.
Auxiliary climate control can be triggered immediately or pre-programmed by entering a departure time. The following control options are available:
Pre-air conditioning button
Multimedia system (for pre-programming only)
Telematics services for hybrid vehicle/electric vehicle (equipment-specific)
Function requirements
No overvoltage or undervoltage of the high-voltage battery
Charge level of the high-voltage battery over the minimum charge level
Circuit 15C OFF
Auxiliary climate control preset
"Improve air quality" (equipment-specific) must be adjusted using the multimedia control.
Auxiliary climate control via unlocking the vehicle
The goal is to temporarily heat up the driver's side seating area when entering the vehicle or ventilate and cool the area with air from the air vents.
Cooling mode is ended after max. t = 60 s or when the engine is started. Heating mode is ended after max. t = 120 s or when the engine is started.
If the charge level for the high-voltage battery is sufficiently high, the pre-entry climate control can be activated up to two times without having to restart the engine.
Pre-air conditioning for departure time
The objective is to pre-heat or pre-cool the vehicle interior prior to departure.
The departure time can be set, selected and activated using the multimedia control or telematics services for hybrid vehicle/electric vehicle (equipment-specific). Up to three departure times can be configured. When the departure time is activated, the LED in the pre-entry climate control button lights up yellow.
The vehicle interior is cooled or heated until the desired temperature in relation to the set departure time has been reached. The pre-entry climate control is activated beforehand here for a maximum of t = 50 minutes. If the departure is delayed, the vehicle interior is air-conditioned for a further t = 5 min.
If the vehicle is connected to a power supply, the charging of the high-voltage battery to the specified minimum charge level has priority. Auxiliary climate control at departure time is only activated following this.
If the vehicle is not connected to a power supply and the high-voltage battery is not completely charged, the operating time of the pre-entry climate control may be shortened.
Auxiliary climate control is ended if the vehicle is started or t = 5 min after the selected departure time has expired.
Pre-entry climate control via pre-entry climate control button
The pre-entry climate control can also be switched on after the desired interior temperature has already been reached. This ensures that the vehicle interior is air-conditioned for up to t = 50 min and the interior temperature is maintained at a constant even during, for example a break in the journey. Auxiliary climate control is switched on or off using the auxiliary climate control button in the air conditioning control panel. Using the indicator lamps in the pre-entry climate control button, the current operating condition of the pre-entry climate control is shown:
Indicator lamp illuminates in red: Heating is switched on
Indicator lamp illuminates in blue: Cooling is switched on
Indicator lamp illuminates in yellow: Departure time is preselected
Evaluation
The control of the climate control assesses the following information for operation of the auxiliary climate control at the departure time:
Interior temperature:
In the head area
In the instrument panel area
Specified temperature on the control of the climate control
Outside temperature
Solar radiation
The cooling function is active if the vehicle interior temperature is at least T = 4 °C above the set specified temperature or if the lowest-possible specified temperature is set. The heating function is active if the vehicle interior temperature is at least T = 4 °C below the set specified temperature or if the highest-possible specified temperature is set.
Ventilation mode
If the measurement shows that the vehicle interior must be pre-cooled, the control of the climate control activates the following functions:
Pre-venting for air conditioner housing and air ducts (electric A/C compressor and blower active)
Seat ventilation for driver's seat (equipment-specific)
The seat ventilation remains switched on even after engine start.
Heating mode
If the measurement shows that the vehicle interior must be heated, the control of the climate control activates the following functions:
Heat boosting via the high voltage PTC heater
The control of the climate control actuates the high-voltage PTC heater. The high voltage PTC heater heats up the coolant. The coolant temperature in the high-voltage PTC heater is recorded by the temperature sensor and read in by the control of the climate control. If the coolant has reached a temperature of T = 35 °C, the control of the climate control actuates the coolant circulation pump directly and transmits the request to switch on the blower motor to the blower regulator, which then directly actuates the blower motor. The coolant circulation pump delivers the coolant from the high voltage PTC heater to the heater core and thus enables heating of the vehicle interior.
Seat heating for driver's seat (equipment-specific)
Rear window heater (outside temperature T < 5 °C)
The seat heater and rear window heater are actuated a maximum of t = 15 minutes before reaching the departure time.
Improve air quality (equipment-specific)
To improve air quality in the vehicle, the ionization function is also started when the auxiliary climate control is started.
Even where assessment of the freeze frame data means that there is no cooling or heating, the function is started and then switched off again after a period of t = 60 s.
The ionization remains switched on even after engine start.
Function schematics | |||
Function schematic for pre-entry climate control | Model 177, 247 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN)) | ||
Model 167 with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in)) | |||
Model 293 with code ME01 (Electric motor) | |||
Model 213 as of model year 2021 with code ME05 (Hybrid drive 85 kW-94 kW variant (incl. plug-in))Model 213 as of model year 2021 with code ME06 (Hybrid drive 60 kW variant (incl. plugin))Model 213 as of model year 2021 with code ME08 (Hybrid drive 75-84 kW VARIANT (INCLUDING PLUGIN)) | |||
Further basic functions | |||
User interface, basic function | |||
Telematics services for hybrid vehicle/electric vehicle, basic function | Model all (CAR) | ||
Climate control, basic function | |||
Ionization, basic function | Model all (CAR) | ||
Seat climate control, basic function | Hybrid/electric vehicles with seat heating | ||
Components | |||
A/C operating unit, basic function | |||
Circulation pump, basic function | |||
Electric refrigerant compressor, basic function | |||
High-voltage PTC heater, basic function | Model all (CAR) |