Patent ID: 9726129
Date: 2017-08-08
CPC Classifications: F01M,F02M

Claim:
1. A method for determining a fuel fraction in lubrication oil circulating in an oil circuit ( 6 ) of a water-cooled internal combustion engine ( 7 ) in a vehicle operated by a driver, said internal combustion engine having a start-stop function, a variable operating point, and cooling water, wherein a variably adjustable oil delivery pump ( 1 ) is provided in the oil circuit ( 6 ), said pump having an outlet side and delivering a volume flow ( 5 ) of oil, which oil delivery pump is actuated by a control unit ( 4 ), wherein the control unit ( 4 ) performs an adjustment of parameters and/or adaptation values of the oil delivery pump ( 1 ) as a function of oil viscosity, wherein a determination of the fuel fraction in the oil is performed on the basis of the parameters and/or adaptation values.