dfreeeze: App solution for controlling auxiliary heaters in cars

digades proprietary development for range-independent control of vehicle components

Limitless comfort thanks to dfreeeze for cars

dfreeeze is a universally applicable connected car solution for simple and range-independent control of auxiliary heating and ventilation. A smartphone app and the corresponding receiver in the car communicate with the auxiliary heater's receiver in the vehicle. The auxiliary heater can still be operated by radio remote control. Auxiliary heater and ventilation are controlled via a server using an app/web app from a smartphone, tablet or PC. dfreeeze is based on the digades "D200" platform.

Functions of dfreeeze

Arrive comfortably and safely

In addition to immediate and range-independent heating/ventilation of the car, dfreeeze provides the possibility of directly setting the desired departure time. The system automatically calculates the required heating intensity and duration. This ensures, that the car is optimally preheated and freed of ice and snow at departure time. The same applies to the ventilation function in summer time. For a quick check in between, dfreeeze, in conjunction with the associated temperature sensor, offers the possibility of checking the temperature in the car as well as the status of the system.

components of the dfreeeze system

  • dfreeeze receiver

  • dfreeeze App for Android, iOS, Web

  • dfreeeze backend

  • Accessories (windscreen adhesive antenna, cable harness, plug and socket housing)

A man operates his auxiliary heater via dfreeeze on his tablet

The backend: dfreeeze server

Stable, secure processes

The server enables a highly secure payment process. Additional functions: user management and administration, configuration management, display of user conflicts during simultaneous use and activation/deactivation of the SIM chip, authorization checks to monitor the use of the SIM.

server-based structure

Advantages of the server-based concept

  • In-App send/receive control commands and feedback messages
  • Response times < 10 seconds through deterministic, non-load-dependent, connection-oriented data transfer
  • High throughput rates through direct connection (at least 500 commands/minute)
  • Increased security
  • High availability, also internationally through close cooperation with network operators
  • Increased user-friendliness through the use of familiar interfaces (authentication) in the app and web portal
  • Controllable costs

The hardware: dfreeeze module

Automotive-certified heart of the dfreeeze system

The robust, AECQ-certified control unit connects the server and the auxiliary heater with each other. The communication with the server takes place via SMS and TCP/IP. Due to the pre-installed eUICC-SIM chip, manual intervention by the end user is no longer necessary, and a subsequent change of provider is possible. The miniaturized electronics, coupled with minimal power consumption, allows the installation in any vehicle. The implementation of a 4G variant is already planned through nested design.

Technical details receiver

  • Transmission frequency: Quad-Band
  • Operating voltage: 12 V DC (9 to 16 V DC)
  • Quiescent current consumption: <5 mA (Stand by Mode)
  • max. output current: 200 mA (12 V DC)
  • Working temperature: -40°C to +85°C
  • Connections
    • Antenna FAKRA standard
    • 6-pin system plug (12V DC (vehicle on-board power supply)
    • W-Bus/LIN
    • Switching output
    • Clocks/button/alarm input
  • Dimensions L x W x H: 88 x 65 x 20 mm
  • Weight: <100 g
  • Protection class: IP43
dfreeeze receiver for controlling the auxiliary heating

The software: dfreeeze App

Easy use and configuration

The app's intuitive design allows the auxiliary heater to be controlled quickly and range-independently. Even several vehicles can be managed in the app. The freely selectable start page and the use of an android widget guarantee easy operation.

dfreeeze App Dashboard
dfreeeze App - register vehicle
dfreeeze App - Programming auxiliary heating
dfreeeze App - Control
dfreeeze App - Settings

Available on smartphone, tablet, PC:

  • iOS App
  • Android App
  • Web-App


  • Control auxiliary heating (heating/ventilation/automatic)
  • Program departure time
  • Request temperature
  • Display system status
  • Make settings

experience and competence.

More then 30 years of development and production.
Intelligent, high-quality designed products.

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