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The servomechanism for air flow control has as effect on cooling starting by the shorting of warming up engine period with the useful consequences: fuel consumption, wear and pollution decreasing. A method for cooling air flow control is the use of a program-controlled blind who obturates section of the radiator of car engine, especially for reduced ambient temperature (≺+50C). For experiments it is used an electronic engineering installation who contains: two thermo resistances for the coolant temperature at the inlet, respectively at the outlet to the radiator, a flow meter with Hall sensor for measuring the coolant flow in the radiator loop, a Precision Analog Microcontroller and Laptop. We denote the first transient phase when the valves of thermostat become to open and the second transient phase between the extreme positions: valve is fully closed or fully open.

The cooling airflow control devices are news in automotive engineering. The authors of this paper have achieved some patents in this field, with car engines application. The purpose was to improve engine performances. In the paper the construction of the cooling airflow control, as they are patented, tests made on some cars and corresponding experimental date are presented. Analyzing the experimental results an improving of combustion process could be observed. The cooling airflow devices are patented in mechanical and electronic form, and a prototype of mechanical device was made. The efficiency of these devices is significant below 5°C environmental temperature.