Patents by Inventor Hans C. Engelbrecht

Hans C. Engelbrecht has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4594993
    Abstract: Disclosed is a system for recirculating exhaust gas in an internal combustion engine having an exhaust gas recirculating conduit which is provided with a valve controlled by two solenoid windings. The system includes a control device including a PID regulator having limitations and cooperating with a three-point switching circuit which exhibits a hysteresis and includes a feedback. The energizing signals for the two solenoid windings are limited between a minimum and a maximum value, whereby the minimum value is defined by the operational sensitivity of the exhaust gas recirculating valve.
    Type: Grant
    Filed: September 6, 1983
    Date of Patent: June 17, 1986
    Assignee: Robert Bosch GmbH
    Inventors: Gerhard Engel, Hans C. Engelbrecht, Wolf Wessel