Patent ID: 9032929
Filing Date: 2015-05-19
Classification: F01M

Abstract:
1. An oil supply apparatus for use with an internal combustion engine having a plurality of lubrication sections, the oil supply apparatus comprising: an oil reservoir unit configured to store oil; an oil supply passage configured to: (i) supply oil stored in the oil reservoir unit to the plurality of lubrication sections, and (ii) recover the oil from the plurality of lubrication sections into the oil reservoir unit; a pump unit configured to discharge the oil stored in the oil reservoir unit to the oil supply passage, the pump unit having a plurality of different stages of oil discharge pressure varied in an increase amount of oil discharge pressure of the pump unit per the rotation speed of the internal combustion engine in response to the rotation speed area of the internal combustion engine, the pump unit having a plurality of switching discharge pressures each changed for each of a plurality of target rotation speeds when the rotation speeds of the internal combustion engine reach the plurality of target rotation speeds, respectively; a discharge pressure detection unit configured to detect the oil discharge pressure discharged from the pump unit; a rotation speed detection unit configured to detect the rotation speed of the internal combustion engine; and an abnormality determination unit configured to set in advance the target rotation speed corresponding to an arbitrary switching discharge pressure selected from among the plurality of switching discharge pressures, and to determine that the level of oil stored in the oil reservoir unit is lowered under the condition that the deviation between the target rotation speed of the internal combustion engine set to correspond to the arbitrary switching discharge pressure and the actual rotation speed of the internal combustion engine actually detected when the oil discharge pressure reaches the arbitrary switching discharge pressure is equal to or greater than a determination value, wherein the abnormality determination unit is configured to: