Air tempering system

Claim 2

In an air tempering system in which tempering of air in the system is controlled by positioning of a movable member: a. an electric power supply; b. an electrically operated servomechanism for effecting movement of said member to positions between a first position wherein air in said system is tempered to a first extreme of a temperature range and a second position wherein air temperatures approach a second extreme of the temperature range; c. control circuitry for operating said servomechanism to control positioning of said member in response to changes in a sensed condition; d. A control switch having a closed condition for completing an energizing circuit through said control circuitry from said power supply and an open condition for interrupting said energizing circuit; e. switching circuitry operative in response to actuation of said control switch to said open condition, to energize said servomechanism for moving said member to a predetermined position in response to said control switch being operated to said open condition when said member is away from said predetermined position; and f. means rendering said switching circuitry inoperative to energize said servomechanism in response to movement of said member to said predetermined position.

Claim 3

An air tempering system as defined in claiM 1 wherein said switching circuitry comprises switch means connected in series between said power supply and said servomechanism and in parallel with said control switch, and a detecting circuit for maintaining said switch means nonconductive when said control switch is in said closed condition, said detecting circuit effective to detect when said control switch is in said open condition and operate said switch means to a conductive condition.

Claim 4

In an air tempering system as claimed in claim 2 wherein said switch means includes an electronic switch having power electrodes connected in series with said servomechanism and a control electrode connected to said detecting circuit.

Claim 5

In a system as claimed in claim 3 and further including second switch means between said first switch means and said servomechanism, said second switch means including a first contact electrically connected to one terminal of said servomechanism, a second contact electrically connected to another terminal of said servomechanism and a third contact individually engageable with said first or second contacts for completing energizing circuits for said servomechanism through said first and second switch means, said first and second contacts moving relative to said third contact in response to energization of said servomechanism.

Claim 6

A system as claimed in claim 4 wherein said first and second contacts are spaced apart and said third contact moves out of electrical engagement with said first and second contacts to interrupt energizing circuit for said servomechanism when said movable member is moved to said predetermined position.

Claim 7

In an air tempering system as claimed in claim 2 wherein said switching circuitry further includes a second switch means operated by said servomechanism, said second switch means having a conductive condition to enable conduction through said first switch means to said servomechanism when said movable member is away from said predetermined position, said servomechanism energized to drive said movable member toward said predetermined position and to operate said second switch means to a nonconductive condition when said movable member is in said predetermined position.

Claim 8

In an air tempering system as claimed in claim 6 wherein said second switch means comprises three contacts and support structure for effecting relative movement between two of said contacts and the third contact, said support structure including a movable nonconducting contact supporting member drivingly connected to said servomechanism, said third contact and one of said two contacts engaged when said movable member is away from said predetermined position in the direction of said first position, and said third contact and the other of said two contacts engaged when said movable member is away from said predetermined position toward said second position, said third contact disengaged from both of said two contacts when said movable member is at said predetermined position.

Claim 9

In a system as claimed in claim 7 wherein engagement of said third and said one of said other two contacts enables energization of said servomechanism to drive said movable member toward said second position, and engagement of said third contact and said other of said two contacts enables energization of said servomechanism to drive said movable member toward said first position.

Claim 10

In a system as claimed in claim 7 wherein said contact supporting member is rotated by said servomechanism and said two contacts are fixed to said supporting member for rotation therewith, said third contact engaging said supporting member and fixed against rotation therewith.

Claim 11

In a temperature control system for tempering air directed to a passenger compartment of a vehicle having at least an air heating heat exchanger in a duct and an electrically energized blower for directing air through the duct: a. a member movable from a first position to enable maximum heat transfer to air from said heat exchanger to a second position for minimizing heat transfer to the air from said heat exchanger; b. a servomechanism for operating said member between said first and second positions and to positions between said first and second positions whereby the temperature of air exhausted from the duct is controlled; c. a speed control switch for said blower, said servomechanism drivingly connected to speed control switch for operating said speed control switch to vary the speed of said blower to provide maximum blower speed when said member is in either of said first or second positions and lesser blower speeds when said member is located between said first and second positions; d. electrically energized circuitry for controlling operation of said servomechanism in response to sensed air temperature in the passenger compartment; e. said circuitry rendered effective to control said servomechanism when connected across an electric power supply through a control switch which is closed when the vehicle is operating and open when the vehicle is not operating; and, f. a servomechanism operating network for causing said servomechanism to move at least said speed control switch to a position for operating said blower at a speed less than said maximum speed whenever said switch is open.

Claim 12

In a temperature control system for tempering air directed to a passenger compartment of a vehicle having at least an air heating heat exchanger in a duct and an electrically energized blower for directing air through the duct: a. a member movable from a first position to enable maximum heat transfer to air from said heat exchanger to a second position for minimizing heat transfer to the air from said heat exchanger; b. a servomechanism for operating said member between said first and second positions and to positions between said first and second positions whereby the temperature of air exhausted from the duct is controlled; c. a speed control switch for said blower, said servomechanism drivingly connected to speed control switch for operating said speed control switch to vary the speed of said blower to provide maximum blower speed when said member is in either of said first or second positions and lesser blower speeds when said member is located between said first and second positions; d. electrically energized circuitry for controlling operation of said servomechanism in response to sensed air temperature in the passenger compartment; e. said circuitry rendered effective to control said servomechanism when connected across an electric power supply through a control switch which is closed when the vehicle is operating and open when the vehicle is not operating; and, f. a servomechanism operating network for causing said servomechanism to move at least said speed control switch to a position for operating said blower at a speed less than said maximum speed whenever said switch is open.

Claim 13

A system as claimed in claim 10 wherein said servomechanism includes a reversible electric motor drivingly connected to said blower speed switch and to said movable member.

Claim 14

An air tempering system of the character defined in claim 1 further characterized by said predetermined position of said movable member being said first position.

Claim 15

In an air tempering system for an engine driven vehicle having manually operated engine operating control means and in which the air in the vehicle is tempered by a member movable between first and second extreme air tempering control positions, a. electrically controlled servomechanism for effecting movement of said member in response to changes in temperature of air in the vehicle; b. and means actuated by said engine control means and moving said member to a predetermined control position in response to termination of operation of said engine.

Claim 16

In an air tempering system for an engine driven vehicle having manually operated engine operating control means and in which the air in the vehicle is tempered by a member movable between first and second extreme air tempering control positions, a. electrically controlled servomechanism for effecting movement of said member in response to changes in temperature of air in the vehicle; b. and means actuated by said engine control means and moving said member to a predetermined control position in response to termination of operation of said engine.