Compensating for water pressure variations in a tempered air system for vehicle passenger compartments
First Claim
1. A system for controlling heating of an occupied compartment:
- (a) pump means operative to provide a source of heated liquid;
(b) heat exchanger means operatively connected for flow therethrough of said heated liquid;
(c) valve means operative upon movement between a closed and a plurality of open positions to control the flow of said liquid to said heat exchanger means;
(d) servo-actuator means operative, upon receipt of an electrical control signal, to move said valve between said closed and open positions;
(e) means operative to sense the position of said valve means and provide an electrical feedback signal indicative thereof;
(f) pressure transducer means disposed to sense the pressure of said liquid flow into said valve means and operative to provide and electrical pressure signal indicative thereof;
(g) relative temperature selector means operative upon an input by the compartment occupant to provide an electrical input signal indicative of an occupant desired relative temperature level;
(h) blower means directing a flow of air over said heat exchanger means;
(i) plenum means operative to direct said flow of air to said occupied compartment;
(j) temperature sensing means sensing the thermal effect of said air flow over said heat exchanger means and operative to provide and electrical temperature signal indicative thereof;
(k) circuit means operative to sum said feedback signal, said temperature signal, said pressure signal, and said input signal and provide an electrical indication of said summation;
(l) signal generating means connected to said circuit means and operative in response to said summation to generate a control signal for operating said servo-actuator means to move said valve means until said sum is zero.
1 Assignment
0 Petitions
Accused Products
Abstract
An automatic control system for regulating the temperature of blower air discharged over a heater core to a vehicle passenger compartment. A thermistor is disposed to sense discharge air adjacent the heater core and provide a temperature signal. An electrical indication is provided of the condition of a servomotor driven valve controlling water flow to the heater core. An electrical reference signal is provided indicative of a user selected relative change of flow discharge air temperature. A signal is provided indicating inlet pressure to the valve controlling flow of liquid to the heater core. The signals are summed; and, the valve servo driven until the sum is zero modulating the valve to maintain the sum at zero for regulating blower air discharge temperature at a constant level.
19 Citations
7 Claims
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1. A system for controlling heating of an occupied compartment:
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(a) pump means operative to provide a source of heated liquid; (b) heat exchanger means operatively connected for flow therethrough of said heated liquid; (c) valve means operative upon movement between a closed and a plurality of open positions to control the flow of said liquid to said heat exchanger means; (d) servo-actuator means operative, upon receipt of an electrical control signal, to move said valve between said closed and open positions; (e) means operative to sense the position of said valve means and provide an electrical feedback signal indicative thereof; (f) pressure transducer means disposed to sense the pressure of said liquid flow into said valve means and operative to provide and electrical pressure signal indicative thereof; (g) relative temperature selector means operative upon an input by the compartment occupant to provide an electrical input signal indicative of an occupant desired relative temperature level; (h) blower means directing a flow of air over said heat exchanger means; (i) plenum means operative to direct said flow of air to said occupied compartment; (j) temperature sensing means sensing the thermal effect of said air flow over said heat exchanger means and operative to provide and electrical temperature signal indicative thereof; (k) circuit means operative to sum said feedback signal, said temperature signal, said pressure signal, and said input signal and provide an electrical indication of said summation; (l) signal generating means connected to said circuit means and operative in response to said summation to generate a control signal for operating said servo-actuator means to move said valve means until said sum is zero. - View Dependent Claims (2, 3, 4, 5, 7)
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6. A method of regulating the temperature of blower discharge air in a vehicle passenger compartment heating system;
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(a) providing an exothermic heat exchanger and flowing heated liquid therethrough from an engine driven pump; (b) forcing a flow of air over the heat exchanger and directing the flow into the vehicle passenger compartment; (c) providing a motor driven valve for controlling liquid flow from the pump to the heat exchanger and providing an electrical indication of the condition of said valve; (d) sensing the temperature of the air flow over said heat exchanger and providing an electrical temperature signal; (e) sensing the pressure of said liquid from said pump and generating an electrical signal indicative of the pressure; (f) generating an electrical reference signal indicative of a user selected relative temperature signal; (g) summing said indication of valve condition, said temperature signal, said pressure signal and said reference signal; (h) driving said valve motor until said sum is zero and modulating said valve condition for maintaining said sum at zero.
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Specification