초록 ▼

The heat exchanger of the temperature control system for a vehicle passenger compartment exchanges heat with air entering the passenger compartment. The flow of heat-exchange medium through the heat exchanger is controllable for controlling passenger-compartment temperature. A servo comparator recei

The heat exchanger of the temperature control system for a vehicle passenger compartment exchanges heat with air entering the passenger compartment. The flow of heat-exchange medium through the heat exchanger is controllable for controlling passenger-compartment temperature. A servo comparator receives and compares a temperature command signal and a feedback signal and produces an error signal which operates an actuator which in turn actuates an adjuster for fluid flow through the heat exchanger. The command signal is derived from a command transducer whose setting is adjustable by a passenger. The feedback signal is derived from a passenger-compartment temperature sensor but additionally, in order to avoid system instability, is furthermore derived from a heat-exchanger temperature sensor. In particular, the feedback signal includes a component whose value is determined by the rate of change with respect to time of the temperature sensed by the heat-exchanger temperature sensor. In this way, when a steady-state condition is achieved and the rate of change of the temperature of the heat-exchanger becomes zero, the steady-state response of the system depends substantially exclusively upon the temperature sensed by the passenger-compartment temperature sensor.

대표청구항 ▼

A negative-feedback temperature control system for conditioning the temperature of air in the passenger compartment of a vehicle, comprising, in combination, heat exchanger means located to exchange heat with air entering the passenger compartment; adjusting means for adjusting the flow of heat-exch

A negative-feedback temperature control system for conditioning the temperature of air in the passenger compartment of a vehicle, comprising, in combination, heat exchanger means located to exchange heat with air entering the passenger compartment; adjusting means for adjusting the flow of heat-exchange fluid flowing through the heat exchanger means; passenger-compartment temperature sensing means for sensing the temperature inside the passenger compartment, heat-exchanger temperature sensing means for sensing the temperature at or near the surface of the heat exchanger means; adjustable command transducer means operable for selecting a passenger-compartment temperature; servo comparator means operative for receiving feedback and command signals and producing an error signal; actuating means connected to the adjusting means for actuating the latter and connected to the servo comparator means for receipt of a signal dependent upon the error signal; means connected to the command transducer means and to the servo comparator means for applying to the latter a command signal derived from the command transducer means; and means applying to the servo comparator means a feedback signal derived from the passenger-compartment temperature sensing means and the heat-exchanger temperature sensing means, including means applying to the servo comparator means a signal whose value depends upon the rate of change with respect to time of the temperature sensed by the heat-exchanger temperature sensing means.