CAR INTERIOR HEATING AND VENTILATING SYSTEM Russian patent published in 2004 - IPC

FIELD: transport engineering; microclimate control systems.

SUBSTANCE: proposed system includes piping system, large and small cooling liquid circulation circuits, fan with electric motor, electric fuse, heater cock and radiator placed in cooling liquid small circulation circuit. Pulse-length modulation circuit is additionally placed in system which includes pulse-length modulator and variable adjusting resistor, diode and power switch. First power output of power switch is connected with minus supply bus, and its second power output is connected with diode anode and with minus output of fan electric motor whose plus output is connected with diode cathode and, through electric fuse, with plus supply bus. Output of pulse-length modulation circuit is connected with power switch control input. Variable adjusting resistor is connected by three outputs with pulse-length modulator. Minus supply output of pulse-length modulation circuit is connected with minus supply bus and its plus supply output is connected with plus supply bus through electric fuse.

EFFECT: provision of stepless control of speed of heating system fan without reducing its efficiency.

1 dwg