Oil supplying apparatus and method of controlling the same

Abstract

An engine output shaft drives an engine driven pumps The engine driven pressurizes oil. An accumulator accumulates the pressurized oil. An electric motor drives a motor driven pump. When the engine rotates at low speed, both the engine driven pump and the motor driven pump supply oil to an oil chamber of a belt type continuously variable transmission. If it is required to enlarge a capacity of the oil chamber quickly, the pressurized oil in the accumulator is supplied to the motor driven pump. The motor driven pump further pressurizes the pressurized oil in the accumulator and supplies it into the oil chamber. It is possible to supply a sufficient amount of oil to the continuously variable transmission. Additionally, since the system may be constructed by using a small type engine driven pump, it is possible to improve fuel efficiency.

Dependencies are inferred from the claim text.