Patent ID: 6135201
Filing Date: 2000-10-24
Classification: B60H

Abstract:
An air conditioning apparatus for a vehicle having a passenger compartment, said air conditioning apparatus comprising:an air conditioning case for forming an air passage, said air conditioning case having a first opening portion for blowing air toward a lower portion of the passenger compartment, a second opening portion for blowing air toward an inner surface of a windshield, a first inside air intake port through which inside air is introduced and an outside air intake port through which outside air is introduced;a heating heat exchanger for heating air passing through said air passage;a partition unit for partitioning said air passage into a first air passage through which inside air flows and a second air passage through which outside air flows when a double layer flow mode is set during an air outlet mode where both said first opening portion and said second opening portion are opened, in such a manner that said first air passage communicates with said first opening portion and said second air passage communicates with said second opening portion;a first fan for blowing inside air introduced from said inside air intake port into said first air passage during said double layer flow mode;a second fan for blowing outside air introduced from said outside air intake port into said second air passage during said double layer flow mode;a motor for driving said first and second fans;a temperature control unit for adjusting a heating amount by said heating heat exchanger to control a temperature of air blown into the passenger compartment;an inside/outside air setting unit for manually setting an outside air introduction state for introducing outside air to said blower;double layer flow mode setting means for automatically setting said double layer flow mode when said outside air introduction state is set manually by said inside/outside air setting unit, while both said first opening portion and said second opening portion are opened and the heating amount is maximized by said temperature control unit; androtation speed reducing means for automatically reducing each rotation speed of said first and second fans to a predetermined level to reduce an air volume blown by said first and second fans, during said double layer flow mode, wherein:said rotation speed reducing means sets each maximum rotation speed of said first fan and said second fan during an entire inside air mode to be equal to that during an entire outside air mode, and sets each maximum rotation speed of said first fan and said second fan during said double layer flow mode to be smaller than any one of that during the entire inside air mode and that during the entire outside air mode.