초록 ▼

An automatic temperature control system for regulating the temperature of a vehicle passenger compartment at an operator selected temperature. The system employs an in-car transducer which senses compartment air temperature and emits a vacuum control signal to a vacuum operated servoactuator. When a

An automatic temperature control system for regulating the temperature of a vehicle passenger compartment at an operator selected temperature. The system employs an in-car transducer which senses compartment air temperature and emits a vacuum control signal to a vacuum operated servoactuator. When ambient temperatures require heating, the servoactuator is operative to shut off the cooling refrigerant compressor and modulate the opening of the heater core water valve for controlling the temperature of forced air discharge from the heater core. When ambient temperatures require cooling, the servoactuator closes the heater core water valve and intermittently opens and closes a switch for cycling the refrigerant compressor to modulate the temperature of forced air discharge over the refrigerant heat exchanger. The transducer receives blower discharge air for aspirating in-car for temperature sensing. A minor portion of the blower discharge is diverted to impinge on the temperature sensor for sensing condensate freezing on the refrigerant heat exchanger.

대표청구항 ▼

A system for controlling the temperature in a vehicle passenger compartment comprising: (a) compressor means operable upon connection to an on-board source of power for providing a source of refrigerant; (b) clutch means operable upon activation and de-activation to drivingly connect and disconnect

A system for controlling the temperature in a vehicle passenger compartment comprising: (a) compressor means operable upon connection to an on-board source of power for providing a source of refrigerant; (b) clutch means operable upon activation and de-activation to drivingly connect and disconnect said compressor means with said source of power; (c) cooler means disposed in heat-exchange relationship with said refrigerant and including means operable to provide heat exchange between said refrigerant and said compartment; (d) heater means receiving an on-board source of heated fluid in heat exchange relationship therewith, said heater means being operable to provide heat exchange between said heated fluid and said compartment; (e) heater valve means operable to control flow of heated engine coolant to said heater means; (f) duct means having said heater means and said cooler means received therein and operable upon receiving a flow of forced air therethrough to direct substantially all of said flow over first one of said heater means and said cooler means and then over the other for providing tempered air; (g) blower means operable to direct a flow of forced air to said duct means upstream of said heater means and said cooler means; (h) plenum means receiving said tempered air from said duct means downstream of said heater means and said cooler means and operable to direct said tempered air to said compartment; (i) sensing tap means operative to divert a minor portion of said duct flow upstream of said heater means and said cooler means; (j) fluid flow powered transducer means operable upon receiving flow from said sensing tap means to sense the temperature of the atmosphere in the vehicle passenger compartment and, upon connection to a source of fluid pressure, provide a modulated fluid pressure signal indicative of variations in the sensed temperature; (k) fluid pressure responsive means including a movable actuator member operable in response to certain characteristics of said fluid pressure signal to modulated said coolant valve between no flow and maximum flow and including switch means operable to actuate and de-actuate said clutch means in response to predetermined amount of movement of said actuator member; and, (l) selector means operative upon actuation by the vehicle operator to provide a desired temperature input to said transducer means wherein, upon the operator actuating said selector means, said transducer provides a variable fluid pressure signal such that said fluid pressure responsive means regulates said coolant valve and cycles said compressor for maintaining the passenger compartment at said desired temperature.