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US 4,362,268 AGranted
Air conditioning system for an automotive vehicle compartment
AssigneeNissan Motor Co., Ltd.
InventorsYukio Shimada, Naoyoshi Suzuki, Toshio Ohashi, Yasushi Inoshita
Life of this patent
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Abstract
An air conditioning system particularly mounted in a passenger compartment of an automotive vehicle according to the present invention can be fixed in the maximum heating operation mode to produce a maximum effect of the defrosting function by only pushing a push-button switch engaged with a mode selector for maximizing the air blowing rate of a ventilating fan and also engaged with a three-way vacuum switch for opening a vacuum power servomechanism to the air to fix an air mix door in the maximum heating position.
Claims11
An air conditioning system for an automotive vehicle compartment,
- which comprises:
- (a) a vacuum source;
- (b) a vacuum power servomechanism for performing proportional control over an opening angle of an air mix door with respect to a position to fully cool air passing through the air conditioning system according to a vacuum pressure value input thereto;
- (c) a vacuum pressure controlling means connected to said vacuum source for controlling the vacuum pressure value input to said servomotor within a range from atmospheric pressure to a vacuum pressure sent from said vacuum source according to a vacuum control signal input from a temperature responsive electric control circuit;
- (d) a first emergency vacuum circuit fixing means connected between said vacuum pressure controlling means and said vacuum power servomechanism for selectively switching said vacuum power servomechanism to be opened to the air;
- (e) a mode selector for operating an air blasting mechanism;
- and
- (f) a defrost mode selecting means operatively connected to said mode selector and to said first emergency vacuum circuit fixing means.
5 more elements
A defrost mode fixing means for a vehicle air conditioning system including:
- (a) a vacuum source (4);
- (b) a double solenoid vacuum device (3) having two valves, one valve linked with said vacuum source which opens to admit a vacuum from said vacuum source thereto when the corresponding solenoid is energized in response to a temperature adjustment electronic control circuit, and the other valve which opens to atmospheric pressure when the corresponding solenoid is energized in response to said temperature adjustment electronc control circuit, said double solenoid vacuum device producing a controlled vacuum pressure according to the opening rates of said two valves;
- (c) a vacuum power servomechanism (5) having a rod extended therefrom whose stroke position depends on the controlled vacuum pressure from said double solenoid vacuum device, said rod extending at a first extreme position when the double solenoid vacuum device is open to atmospheric pressure;
- (d) an air mix door (6), operatively connected to the rod extended from said vacuum power servomechanism for angular movement corresponding the stroke position of the rod for adjusting the rate of air passing through an air heating element of an air conditioning duct to provide tempered air to a vehicle compartment, said air mix door being positioned for maximum air heating when the rod is positioned at said first extreme position;
- and
- (e) a mode selector (13) having an actuating member for operating an air blasting mechanism to direct air into said vehicle compartment in a defrost mode of operation, said defrost mode fixing means comprising:
- (a) a first three-way switching member (10), connected between said double solenoid vacuum device and said vacuum power servomechanism, and connected to atmospheric pressure, said switching member switching from a first position communicating said controlled vacuum pressure to said power servomechanism to a second position communicating atmospheric pressure to said power servomechanism in response to actuation of a control member;
- and
- (b) a manually operable switching member (11, 12, 31, and 32) for simultaneously actuating said actuating member and said control member,
- whereby, upon actuation of said switching member, said defrost mode is effected simultaneously with maximum air heating.
7 more elements
Dependencies are inferred from the claim text.