Automotive vehicle automatic temperature control system

Claim 2

In an automotive vehicle automatic temperature control system of the type including a heater core, an evaporator, a condenser, compressor and a clutch connecting the compressor to the engine of the automotive vehicle, a source of vacuum, a temperature sensor connected with said source of vacuum and sensing in-car and ambient air temperature and modulating source vacuum in accordance with temperature requirements, a vacuum selector having at least an automatic and a vent position, a vacuum connection from said source of vacuum to said vacuum selector, a vacuum connection from said sensor to said vacuum selector, a power servo vacuum motor, an air blend door operated thereby controlling the admission of heated air, cooled air and blended heated and cooled air into the passenger compartment of the vehicle, a vacuum connection from said sensor to said power servo vacuum motor connecting said motor to modulated vacuum, a blower, a blower motor, operable to drive said blower to force heated and cooled air into the passenger compartment of the vehicle, a programmer operated by said servo motor, said programmer completing electrical connections to said blower motor for varying the speed of said blower motor in accordance with temperature requirements and the position of said vacuum power servo and said air blend door,

Claim 3

The automatic temperature control system of claim 1, wherein the energizing circuit to said blower motor includes, a relay having normally closed contacts, a solenoid coil operable to open said contacts, an energizing circuit to said solenoid coil including a temperature sensitive switch sensitive to engine temperature and closing when the engine is cold and energizing said solenoid coil to deenergize said blower and hold said blower motor deenergized until opening of said temperature sensitive switch upon elevated engine coolant temperature conditions.

Claim 4

The automatic temperature control system of claim 2, including two servo motors connected in parallel, a fresh air door operated by one of said motors, a recirculting air door operated by the other of said motors alternately of operation of said fresh air door, wherein the relay is an electro-vacuum relay, wherein a vacuum connection is provided from source vacuum to said relay and another vacuum connection is provided from said relay to said two power servo vacuum motors in parallel, for effecting closing of said recirculation door and opening of said fresh air door upon energization of said solenoid coil.

Claim 5

The automatic temperature control system of claim 3, in which the parallel vacuum connection from said electro-vacuum relay to said vacuum motors includes, a vacuum input having vacuum connection with said two motors, a bleed passage bleeding vacuum connected with said vacuum input and delaying closing of said recirculation door and opening of said fresh air door for a predetermined time interval when the engine is cold, to accommodate the purging of stored air prior to the circulation of fresh air into the passenger compartment of the vehicle.

Claim 6

The automatic temperature control system of claim 4, including a series of resistors connected in series between said programmer and said blower motor, a time delay switch operated by said servo motor closing said recirculation door and closed upon closing of said door, to complete a circuit from said relay to said programmer, and an electrical connection directly connecting said relay to said blower motor through said resistors for energizing said blower motor at a low speed to purge the system for a predetermined time interval during engine warm-up.

Claim 7

The automatic temperature control system of claim 5, wherein the electro-vacuum relay includes a valve controlling the passage of vacuum from said bleed orifice to the source of vacuum, and wherein Said valve is opened upon energization of said solenoid coil to delay closing of said recirculation door and opening of said fresh air door for a predetermined delayed time interval during engine warm-up.

Claim 8

The automatic temperature control system of claim 1, including, a water valve controlling the passage of hot water to the heater core for the vehicle, electrical energizable means controlling the opening and closing of said water valve, and an energizing circuit from said programmer to said electrical energizable means energizable to connect said vacuum motor to a source of vacuum, to shut off said water valve and the supply of water to the heater core upon extreme travel of said first mentioned vacuum servo motor and programmer operated thereby where maximum cooling is required.

Claim 9

The automatic temperature control system of claim 7, including, a vacuum motor for operating said water valve, a connection from the source of vacuum to said vacuum motor, and wherein the electrical energizable means includes a solenoid controlled valve connected in the energizing circuit from said programmer and energized upon extreme travel of said servo vacuum motor and programmer for maximum cooling conditions.

Claim 10

The automatic temperature control system of claim 5, wherein the time delay switch is carried by said servo motor closing said recirculation door, wherein an operative connection is provided between said switch and said servo motor for closing said switch upon closing of said recirculation door and opening of said fresh air door, to provide an energizing circuit to said blower motor through said relay and said time delay switch as the engine has warmed up.

Claim 11

The automatic temperature control system of claim 9, including an energizing circuit to said blower through said relay and said resistors for bypassing said time delay switch upon closing of said relay, as said recirculation door remains closed and said time delay switch is open to drive the motor at a low blower speed and purge the system of stored air.

Claim 12

The automatic temperature control system of claim 10, including, a water valve controlling the passage of water to the heater core for the vehicle, a connection from the source of vacuum to said water valve including a vacuum control valve and a solenoid operable to open said valve, an energizing circuit from said programmer to said solenoid for energizing said solenoid and effecting opening of said vacuum control valve and closing of said water valve upon extreme travel of said servo motor and programmer into a maximum cooling position.

Claim 13

The automatic temperature control system of claim 1, including, a second power servo vacuum motor, said vacuum selector being positionable to connect said second power servo vacuum motor to modu ated vacuum, modulated by said temperature sensor when in an automatic position, a mode door operated by said second power servo vacuum motor to provide a continuous modulation of air discharged by said blower from floor to bi-level to panel and from heating to cooling.

Claim 14

The automatic temperature control system of claim 12, including, two additional power servo vacuum motors connected in parallel, a fresh air door operated by one of said additional power servo vacuum motors, a recirculation door operated by the other of said additional power servo vacuum motors alternately of operation of said fresh air door to close as said fresh air door opens and vice versa, an electro-vacuum relay, a vacuum connection is from source vacuum to said relay and another vacuum connection from said relay to said two additional power servo vacuum motors, said electro-vacuum relay including a solenoid coil and contacts normally closed and opening upon energization of said solenoid coil, an energizing circuit for said solenoid coil and including a temperature sensitive switch sensitive to engine temperature and closed when the engine is colD, and energizing said solenoid coil to open its contacts and prevent energization of said blower motor, and holding said blower motor deenergized until opening of said temperature switch upon elevated engine coolant temperature conditions, energization of said solenoid coil also opening said electro-vacuum relay valve, to connect said power servo motors to source vacuum in parallel, to effect closing of said recirculating door and opening of said fresh air door as the coolant temperature reaches a predetermined comfortable temperature level, said temperature sensitive switch opening upon elevated engine coolant temperatures to deenergize said solenoid coil and effect closing of said relay contacts and closing of said electro-vacuum relay valve and heating of the passenger compartment under control of said programmer.

Claim 15

The automatic temperature control system of claim 13, in which the vacuum connection from said electro-vacuum relay to said vacuum motors connected in parallel, includes, a vacuum input for said electro-vacuum relay and a bleed passageway in said input delaying closing of said recirculation door and opening of said fresh air door for a predetermined time interval upon cold engine coolant conditions.

Claim 16

In an automotive vehicle automatic temperature control system of the type having a heater core, an evaporator, a condenser, a compressor, and a clutch connecting the compressor to the engine of the automotive vehicle, a source of vacuum, a blower, a blower motor, operable to drive said blower to force heated and cooled air into the passenger compartment of the vehicle, a programmer, a plurality of resistors connected in series, said programmer connecting said blower motor in an electrical energizing circuit through said resistors, and cutting said resistors out of the circuit, for varying the speed of said motor in accordance with temperature requirements, a relay having normally closed contacts, a solenoid coil for opening said contacts when energized, an energizing circuit to said solenoid coil including a temperature sensitive switch sensitive to engine temperature and closing when the engine is cold and energizing said solenoid coil to deenergize said blower and hold said blower motor deenergized until opening of said temperature sensitive switch upon elevated coolant temperature conditions.

Claim 17

In an automotive vehicle automatic temperature control system of the type having a heater core, an evaporator, a condenser, a compressor, and a clutch connecting the compressor to the engine of the automotive vehicle, a source of vacuum, a blower, a blower motor, operable to drive said blower to force heated and cooled air into the passenger compartment of the vehicle, a programmer, a plurality of resistors connected in series, said programmer connecting said blower motor in an electrical energizing circuit through said resistors, and cutting said resistors out of the circuit, for varying the speed of said motor in accordance with temperature requirements, a relay having normally closed contacts, a solenoid coil for opening said contacts when energized, an energizing circuit to said solenoid coil including a temperature sensitive switch sensitive to engine temperature and closing when the engine is cold and energizing said solenoid coil to deenergize said blower and hold said blower motor deenergized until opening of said temperature sensitive switch upon elevated coolant temperature conditions.

Claim 18

The automatic temperature control system of claim 15, including, two servo motors connected in parallel, a fresh air door operated by one of said motors, a recirculating air door operated by the other of said motors alternately of operation of said fresh air door, wherein the relay is an electro-vacuum relay, wherein a vacuum connection is provided from source vacuum to said relay and another vacuum connection is provided from said relay to said two power servo vacuum motors in parallel, for effecting closing of said recirculation door and opening of said fresh air door upon energization of said solenoid coil.

Claim 19

The automatic temperature control system of claim 16, in which the parallel vacuum connection from said electro-vacuum relay to said vacuum motors includes, a vacuum input having vacuum connection with said two motors, a bleed passage bleeding vacuum connected with said vacuum input and delaying closing of said recirculation door and opening of said fresh air door for a predetermined time interval when the engine is cold, to accommodate the purging of stored air prior to the circulation of fresh air into the passenger compartment of the vehicle.

Claim 20

The automatic temperature control system of claim 16, including, a time delay switch operate by said servo motor closing said recirculation door and closed upon closing of said door, to complete a circuit from said relay to said programmer, and an electrical connection directly connecting said relay to said blower motor through said resistors for energizing said blower motor at a low speed to purge the system for a predetermined time interval during engine warm-up.