Residual durability determining method of transmission fluid in vehicle, involves producing current fluid residual durability signal when one of durability oxidation and gear shift values reaches zero

摘要

A current fluid residual durability oxidation value is determined during measuring temperature of volume fraction of fluid. The incremental reductions in fluid residual durability gear shift are subtracted from current durability value, to determine current fluid residual durability gear shift value. A durability signal is produced when one of determined oxidation and gear shift values reaches zero.