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SELECTOR/PROGRAMMER ASSEMBLY FOR AUTOMATIC TEMPERATURE CONTROL

  • US 3,731,729 A
  • Filed: 02/07/1972
  • Issued: 05/08/1973
  • Est. Priority Date: 02/07/1972
  • Status: Expired due to Term
First Claim
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1. An automatic temperature control system for heating and cooling an automobile passenger compartment comprising:

  • a plurality of vacuum operated motors operably connected to air doors for transmitting air from said passenger compartment, through heating and cooling means and selectively to different outlets opening into the passenger compartment;

    means including a pivotal air mix door which proportions air flow between a heater and a bypass around the heater for regulating the temperature of air introduced into the passenger compartment;

    air blower means driven by an electric motor which is adapted to be operated at different speeds for varying the quantity of air flowing into said passenger compartment;

    an integral vacuum pressure and electrical switching assembly for alternately applying vacuum pressure to said vacuum motors to effect a predetermined air flow into said passenger compartment;

    said switching assembly also adapted to selectively apply vacuum pressure to vacuum actuators which operate electrical switches for varying the rotational speed of said blower motor;

    said assembly including a plurality of adjacent plates lying parallel to one another;

    passages formed between said plates by channels in said plates for transmitting vacuum pressure;

    a first vacuum switch including a rotor with a grooved face adapted to engage the surface of one of said plates for alternately interconnecting said channel passages as said rotor is rotated against said plate;

    a second vacuum switch including a rotor with a grooved face adapted to engage the surface of one of said plates for alternately interconnecting said channel passages as said rotor is rotated against said plate;

    said first and second vacuum switches being coactive with said channels to selectively direct vacuum pressure to said vacuum motors and vacuum actuators for effecting desired air flow into said passenger compartment and for producing a predetermined blower speed;

    an arm operatively connecting said second rotor to said air mix door for pivoting said door into its operative positions as said second rotor is rotated;

    means responsive to the temperature of air in the passenger compartment including a bimetal member and an air bleed valve coactive to generate a variable vacuum pressure in one of said vacuum motors which rotates said second rotor and said connected air mix door;

    a vacuum pressure regulating valve remotely moved manually from the passenger compartment for generating a variable vacuum pressure in another of said vacuum motors to effect rotation of said first rotor in response to movement of a control member.

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