Method of controlling electric oil pump in hybrid vehicle

Abstract

A method of controlling an electric oil pump in a hybrid vehicle controls, at an ultra-low temperature, the electric oil pump so that the number of revolutions thereof is not unnecessarily increased, so as to prevent unnecessary power consumption of the battery, thereby contributing to an increase in fuel efficiency, to prevent unnecessary noise, thereby improving the market quality of the vehicle, and to improve the endurance of the electric oil pump.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]The present application claims priority of Korean Patent Application Number 10-2011-0131872 filed Dec. 9, 2011, the entire contents of which application is incorporated herein for all purposes by this reference.[0002]BACKGROUND OF INVENTION[0003]1. Field of Invention[0004]The present invention relates, in general, to a method of controlling an electric oil pump in a hybrid vehicle and, more particularly, to a method of controlling an electric oil pump at an ultra-low temperature.[0005]2. Description of Related Art[0006]A hybrid vehicle is provided with an electric oil pump, which can operate irrespective of the operation of an engine, in addition to a mechanical oil pump, which is provided inside a transmission, so that hydraulic pressure necessary for the transmission can be supplied even in a situation in which, for example, the engine does not operate.[0007]The above-mentioned method of controlling an electric oil pump of the related a...

AI Technical Summary

Benefits of technology

The present invention describes a method to control an electric oil pump in a hybrid vehicle to increase fuel efficiency and prevent unnecessary power consumption of the battery. This is achieved by controlling the number of revolutions of the electric oil pump at ultra-low temperatures to prevent unnecessary noise and improve the market quality of the vehicle. Additionally, this method can also improve the endurance of the electric oil pump.

Problems solved by technology

Therefore, in the ultra-low-temperature state, it may be inappropriate to control the electric oil pump, which is set to the room temperature state, in an open loop up to a reference number of revolutions.

This consequently leads to a situation in which the number of revolutions of the electric oil pump is unnecessarily increased, as indicated by “A” in FIG. 2.

When the number of revolutions of the electric oil pump is needlessly increased like this, the battery unnecessarily consumes electrical power, resulting in an adverse effect on fuel efficiency.

In particular, this unnecessarily causes noise, thereby reducing the market quality of a vehicle, and is undesirable for the endurance of the vehicle, which is problematic.

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