US 4,394,957 AGranted

Sensor control device

OwnerJohn P. Newton, IIIinventor

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Abstract

A sensor control device for controlling the operation of a device such as an air blower, including a sensor capable of sensing a change in the environment from a predetermined level and providing a signal corresponding to the change and a logic means capable of receiving the signal and based upon this signal control the operation of the blower device in such a manner that its operation is in proportion to the change in the environment while inhibiting small changes from affecting the operation of the blower. The sensor device is particularly advantageous in controlling the amount of circulation provided by a blower device interposed between a thermal collector and a building so as to provide the circulation of thermal energy therebetween.

Claims24

Dependent claims

A control circuit adapted to be coupled with a power source for providing an output capable of controlling the operation of a device such as a blower, with said circuits output being a function of a change in a controlled environment from a predetermined level, comprising:

sensor means capable of sensing a change in the environment and providing a signal corresponding to said change;
logic means capable of receiving said signal and providing an output for controlling the operation of the device, said logic means includes:
first generating means capable of generating periodically a reference pulse of predetermined pulse width;
second generating means capable of generating a pulse having a width that varies as a function of the signal corresponding to the change from the predetemined level;
and means capable of determining the difference in width of said pulses and based upon said difference gate or inhibit the output of the control circuit so that the output is proportional to the change in the environment with small changes from the predetermined level inhibited from causing undesired oscillation of the output about said level.

2 more elements

An environmental sensor control system comprising:

a device such as a blower capable of operating in either a forward or a reverse mode;
interface means coupled with the device;
a control circuit adapted to be coupled between said interface means and a power source, said control circuit providing an output capable of controlling the operation of the device with said output being a function of a change in a controlled environment from a predetermined level;
said control circuit comprising:
sensor means capable of sensing a change in the environment and providing a signal corresponding to said change;
logic means capable of receiving said signal and providing an output for controlling the operation of the device, said logic means output being operationally coupled to the device and proportional to the change in the environment so as to cause a corresponding proportional change in the operation of the device while being capable of inhibiting small changes from the predetermined level from causing undesired oscillation of the output about said level;
and means capable of selecting a mode and controlling the operation of the device when in a particular mode.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 06/245,724Filed 20 Mar 1981
Granted: 26 Jul 1983
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A01G 9/246
Devices or systems for heating, ventilating, regulating temperature , illuminating, or watering, in greenhouses, forcing-frames, or the like:…
F24F 11/0001
Control or safety arrangements: for ventilation
H03K 7/08
Modulating pulses with a continuously-variable modulating signal: duration or width modulation ; Duty cycle modulation
Y02A 40/25
In agriculture: greenhouse technology, e.g. cooling systems therefor

Family

No related US applications are recorded in the indexed filing history.

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