Patent References 3514377 3562521 3699032 3738341 Exhaust gas operated apparatus for continuously measuring air number of engine intake mixture Analytical apparatus Analytical apparatus and processes Air/fuel ratio control system for internal combustion engine having high input impedance circuit Combustibles analyzer Cruise economy system Patent #: 4169440 InventorsAssigneeApplicationNo. 06/126606 filed on 03/03/1980US Classes:205/785, With heating or temperature sensing204/406, With significant electrical circuitry or nominal computer device204/412, Three or more electrodes204/425, With impressed current means204/426, Planar electrode surface205/784, Gaseous oxygen or oxygen containing compound60/276Having means analyzing composition of exhaust gasExaminersPrimary: Kaplan, G. L.Attorney, Agent or FirmInternational ClassG01N 27/406 (20060101)AbstractThis specification discloses a device to determine the percentage of oxygen in an ambient atmosphere. The device, which is immersed in the atmosphere, is constructed to define an enclosed volume in which the atmosphere can be established by means of a small leak. The enclosing structure contains two partitions which can conduct oxygen ions and act as electrochemical cells. One partition is called the pump cell while the other is called the sensor cell. When attached to an external power supply, the current (Ip) drawn through the pump cell either adds or removes (from or to the ambient) gaseous oxygen from the volume. As a result of the pumping action, an EMF (VS) develops across the sensor cell which can be used to measure the change in oxygen partial pressure in the volume relative to the ambient. If an external circuit causes adequate current to flow in the pump cell to keep the sensor EMF at a constant value, then the magnitude of the current is linearly proportional to the percentage of oxygen in the atmosphere. |
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