Heater control for a motor vehicle
First Claim
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1. A heating system for motor vehicles comprising:
- heat exchanger means, connected to the engine of the motor vehicle for circulation of a heating medium through said heat exchanger means;
valve means disposed between said engine and said heat exchanger means for controlling the flow rate of said heating medium through said heat exchanger;
first temperature sensor means, for generating a first electrical signal dependent on the air temperature in the passenger compartment of said motor vehicle;
second temperature sensor means, for generating a second electrical signal dependent on the air temperature adjacent said heat exchanger means;
a set point generator, for generating an electrical set-point signal; and
controller means, for receiving said first and second electrical signals and said set-point signal and for generating an output control signal for actuating said valve means;
wherein said first and second temperature sensor means are connected in series and the change in signal from said first sensor means is greater than the change in signal from said second sensor means for the same change in temperature.
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Abstract
A heating system for a motor vehicle has temperature sensors for gauging the compartment temperature as well as for gauging the temperature of the effluent hot air. These sensors are connected in series, with the compartment sensor generating the more significant control signal. The flow of heating medium, for example engine water, is regulated by a valve under the control of a regulator which compares the sensors signals with a set-point value. The valve may be cyclically actuated by pulses of fixed frequency but having a width which depends on the results of the signal comparison.
24 Citations
16 Claims
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1. A heating system for motor vehicles comprising:
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heat exchanger means, connected to the engine of the motor vehicle for circulation of a heating medium through said heat exchanger means; valve means disposed between said engine and said heat exchanger means for controlling the flow rate of said heating medium through said heat exchanger; first temperature sensor means, for generating a first electrical signal dependent on the air temperature in the passenger compartment of said motor vehicle; second temperature sensor means, for generating a second electrical signal dependent on the air temperature adjacent said heat exchanger means; a set point generator, for generating an electrical set-point signal; and controller means, for receiving said first and second electrical signals and said set-point signal and for generating an output control signal for actuating said valve means;
wherein said first and second temperature sensor means are connected in series and the change in signal from said first sensor means is greater than the change in signal from said second sensor means for the same change in temperature. - View Dependent Claims (2, 3, 4, 5, 6, 16)
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7. A heating system for motor vehicles comprising:
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heat exchanger means, connected to the engine of the motor vehicle for circulation of a heating medium through said heat exchanger means; valve means disposed between said engine and said heat exchanger means for controlling the flow rate of said heating medium through said heat exchanger; first temperature sensor means, for generating a first electrical signal dependent on the air temperature in the passenger compartment of said motor vehicle; second temperature sensor means, for generating a second electrical signal dependent on the air temperature adjacent said heat exchanger means; a set point generator, for generating an electrical set-point signal; and controller means for receiving said first and second electrical signals and said set-point signal and for generating output control pulses of fixed frequency and of a width corresponding to the deviation of the sum of said first and second electrical signals from said set-point signal, and wherein the change in signal from said first sensor means is greater than the change in signal from said second sensor means for the same change in temperature. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15)
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Specification