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A device for regulating the heat output or heat capacity of a heat exchanger in an automotive vehicle with an actuating member to control the flow of a heat exchange medium and with a control device operating the actuating member. To provide input to the control device, signals are received from a h

A device for regulating the heat output or heat capacity of a heat exchanger in an automotive vehicle with an actuating member to control the flow of a heat exchange medium and with a control device operating the actuating member. To provide input to the control device, signals are received from a highly rated internal temperature sensor and a lower rated heating air temperature sensor disposed at the outlet of the heat exchanger as well as a manually adjustable set point generator. The control device includes a pulse generator producing a triangular voltage of a constant frequency, with a differential amplifier for the signals of the temperature sensors as well as the set point generator. A comparator is provided for producing rectangular pulses in correspondence with the triangular voltage frequency, with a pulse width corresponding to the temperature signal of the differential amplifier. The heat exchanger is tubular and has a large ratio of heat exchange medium volume to heat dissipating surface area. The actuating member is formed as a solenoid valve which is in an open position when the electromagnet of the valve is unenergized. The valve is arranged downstream of the heat exchanger.

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1. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, character

1. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to be in an open condition when the electromagnet is unenergized, that each tube of the tubular heat exchanger terminates in a tube end, and in that each tube end is closed off by a tube bottom portion embedded in an elastic material, and the heat exchanger is subdivided by at least one intermediate tank into two successive zones having different temperature levels, and in that means are provided at the intermediate tank for permitting only minor heat exchange. 2. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to being an open condition when the electromagnet is unenergized, that a first temperature sensor is provided for sensing an internal temperature of the vehicle and for providing an output signal of the sensed temperature, a second temperature sensor is arranged in an area of an outlet of the heat exchanger for sensing heating air temperature and for providing an output signal of the sensed air temperature, and a manually set-point generator for providing an output signal of a set temperature, said output signals of said first and second temperature sensors and said set-point generator form the predetermined input signals, that the control means includes a pulse generator means for producing a triangular output voltage signal of a constant frequency, a differential amplifier means is interposed between said first and second temperature sensors and said set-point generator and the electromagnetically operated valve, said differential amplifier means receives the output signals from the first and second temperature sensors and the set-point generator and provides an output temperature signal, and in that a comparator means is provided for receiving the output temperature signals from the differential amplifier means and the triangular output voltage signal from the pulse generator means, and for providing an output signal in the form of rectangular pulses in correspondence with the triangular voltage frequency with a pulse width corresponding to the temperature signal of the differential amplifier means, each tube of the tubular heat exchanger terminates in a tube end, and each tube end is closed off by a tube bottom portion embedded in an elastic material, the heat exchanger is subdivided by at least one intermediate tank into two successive zones having different temperature levels, and means are provided at the intermediate tank for permitting only minor heat exchange. 3. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to be in an open condition when the electromagnet is unenergized, that the heat exchanger is subdivided by at least one intermediate tank into two successive zones having different temperature levels, and in that means are provided at the intermediate tank for permitting only minor heat exchange. 4. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to being an open condition when the electromagnet is unenergized, wherein said heat exchanger comprises at least an intermediate tank, further characterized in that a reflux conduit means extends away from the intermediate tank and terminates in a return conduit at a position upstream of the actuating mens, as viewed in a flow direction of the heat exchange medium. 5. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating means in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to be in an open condition when the electromagnet is unenergized, wherein said heat exchanger comprises at least an intermediate tank, further characterized in that a reflux conduit means extends away from the intermediate tank and is connected to a return conduit downstream of the actuating means, as viewed in a flow direction of the heat exchange medium. 6. A device for regulating heat output of a heat exchanger of a motor vehicle, the device includes an actuating means for controlling a flow of heat exchange medium through the heat exchanger, and a control means for operating the actuating mens in response to predetermined input signals, characterized in that the heat exchanger is a tubular heat exchanger, and in that the actuating means is an electromagnetically operated valve arranged downstream of the heat exchanger, said valve is constructed so as to be in an open condition when the electromagnet is unenergized, and a control valve means is arranged in a reflux conduit means for controlling a flow through the conduit means, the control valve means is controllable together with the actuating means. 7. A device according to one of claims 1 or 2, characterized in that said means for permitting only minor heat exchange includes insulation disposed at the intermediate tank. 8. A device accordng to one of claims 1 or 2, characterized in that a reflux conduit means extends away from the intermediate tank and terminates in a return conduit at a position upstream of the actuating means, as viewed in a flow direction of the heat exchange medium. 9. A device according to one of claims 1 or 2, characterized in that a reflux conduit means extends away from the intermediate tank and is connected to a return conduit downstream of the actuating means, as viewed in a flow direction of the heat exchange medium. 10. A device according to claim 9, characterized in that a control valve means is arranged in the reflux conduit means for controlling a flow through the conduit means, the control valve means is controllable together with the actuating means. 11. A device according to claim 10, characterized in that the control valve means and the actuating means form a single structural unit. 12. A device according to claim 11, characterized in that a governor means is arranged in the reflux conduit means for controlling a flow volume therethrough. 13. A device for regulating heat output of a heat exchanger of a motor vehicle, characterized in that the heat exchanger is a tubular heat exchanger, actuating means for controlling a flow of heat exchanger medium through the heat exchanger, control means for effecting displacement of only a partial volume of air of the heat exchanger during the time period said activating means is open, said control means comprising means for operating the activating means in response to predetermined input signals. 14. A device according to one of claims 3-6 and having a first temperature sensor provided for sensing an internal temperature of the vehicle and for providing an output signal of the sensed temperature, a second temperature sensor arranged in an area of an outlet of the heat exchanger for sensing heating air temperature and for providing an output signal of the sensed air temperature, and a manually set-point generator for providing an output signal of a set temperature, said output signals of said first and second temperature sensors and said set-point generator form the predetermined input signals, and wherein the control means includes a pulse generator mens for producing a triangular output voltage signal of a constant frequency, a differential amplifier means interposed between said first and second temperature sensors and said set-point generator and the electromagnetically operated valve, said differential amplifier means receives the output signals from the first and second temperature signal, and a comparator means provided for receiving the output temperature signal from the differential amplifier means and the triangular output voltage signal from the pulse generator means, and for providing an output signal in the form of rectangular pulses in correspondence with the triangular voltage frequency with a pulse width corresponding to the temperature signal of the differential amplifier means.