Oil level measurement method for sump of a motor vehicle engine uses reference and level tubes to provide a measurement signal and a compensation signal so that variables can be compensated and a true level found

摘要

The oil level sensor comprises a housing tube (10) mounted in the oil reservoir, a level tube (20) and a reference tube (22). A circuit connected to the tubes delivers a signal dependent on the oil level in the reservoir. A processing step uses the signals from the reference tube and the measurement tube to determine the actual oil level. The reference tube is used to provide a compensating signal for use with the level tube so that effects such as temperature, impurities, etc. can be neglected and the true oil level is found.