Patents Assigned to Eftag-Entstaubungs- und Fordertechnik AG
  • Circuit arrangement for the evaluation of a signal produced by a semiconductor gas sensor
    Patent number: 4992965
    Abstract: A circuit for the evaluation of a signal produced by a semiconductor gas sensor provides a reliable control for manipulating a recirculated air valve in motor vehicles and their air-conditioning systems and includes a voltage divider connected with an integrator having a time constant bigger than time needed for reaching a peak of noxious gases outside of the motor vehicle.
    Type: Grant
    Filed: November 30, 1988
    Date of Patent: February 12, 1991
    Assignee: Eftag-Entstaubungs- und Fordertechnik AG
    Inventors: Heinz Holter, Hanns Rump, Helmut Vietze