×

Method and device for monitoring and/or determining motor oil quality

  • US 6,732,572 B1
  • Filed: 08/18/2000
  • Issued: 05/11/2004
  • Est. Priority Date: 11/07/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of determining motor oil quality, comprising the steps of:

  • determining a viscosity of the motor oil during operation of an internal combustion engine;

    determining and evaluating a change of the viscosity of the motor oil determined in the viscosity determining step as a function of a temperature and frictional torque of the engine; and

    determining starter torque, the viscosity change determining and evaluating step including the substep of determining the frictional torque in accordance with the starter torque.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×