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Variable compression ratio device and control method thereof

A control method and compression ratio technology, applied in fluid pressure actuators, electrical control, engine control, etc., can solve problems such as poor efficiency, and achieve the effects of reducing fuel consumption and improving fuel efficiency

Inactive Publication Date: 2019-03-01
HYUNDAI MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, a VCR device with a complicated structure or increased weight may result in poor efficiency

Method used

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  • Variable compression ratio device and control method thereof
  • Variable compression ratio device and control method thereof
  • Variable compression ratio device and control method thereof

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Embodiment Construction

[0058] Hereinafter, certain embodiments of the present application will be described in detail with reference to the accompanying drawings. In the drawings, the size and thickness of components are arbitrarily shown for descriptive purposes, and thus the present application is not limited to the illustrations of the drawings, and thicknesses are exaggerated to clearly show various components and regions. The drawings and specification are to be regarded as illustrative rather than restrictive, and like reference numerals refer to like elements throughout the specification.

[0059] In the following description, terms such as 'first' and 'second' may be used only to distinguish one component from another when related elements have the same name, and the order thereof is not limited. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. It will also be understood that when the term...

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Abstract

A variable compression ratio device and a control method thereof are provided. The device includes a connecting rod connected to a piston in a cylinder and an eccentric cam interposed between a pistonpin and the connecting rod. The eccentric cam moves the piston vertically to vary a compression ratio according to an eccentric cam rotation position. A hydraulic controller adjusts hydraulic fluid supplied to first and second chambers formed between the eccentric cam and the connecting rod. The first chamber rotates the eccentric cam in one direction by supplied hydraulic fluid. The second chamber rotates the eccentric cam in another direction by the supplied hydraulic fluid. A position sensor senses a piston position. A compression ratio controller calculates a target compression ratio according to an operating condition of an engine, calculates a current compression ratio based on the piston, and adjusts the eccentric cam rotation position using an oil control valve.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of priority to Korean Patent Application No. 10-2017-0103408 filed in the Korean Intellectual Property Office on August 16, 2017, which is hereby incorporated by reference in its entirety. technical field [0003] The present application generally relates to a variable compression ratio device and its control method, and more particularly to variable compression that continuously changes the compression ratio in the combustion chamber of an internal combustion engine according to the operating conditions of the engine, thereby improving fuel efficiency and power than the device. Background technique [0004] In a typical internal combustion engine, air or a fuel-air mixture flows into the engine's combustion chamber, and a piston rises to compress the combustion chamber gases to a preset compression ratio. A variable compression ratio (VCR) device changes the compression ratio of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D15/04F02B75/04
CPCF02B75/04F02D15/04F02D41/009F02D41/14F02B75/045F16C2360/22F16C3/14F02D15/02F16C7/06G01M15/06F15B15/12
Inventor 崔命植金远圭
Owner HYUNDAI MOTOR CO LTD
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