Valve device

Patent metadata

Field	Value
Publication number	US-10036332-B2
Application number	US-201515523816-A
Country	US
Kind code	B2
Filing date	Nov 16, 2015
Priority date	Nov 20, 2014
Publication date	Jul 31, 2018
Grant date	Jul 31, 2018

Abstract

An electrically-operated actuator rotates a valve toward its closing side or opening side. A valve urging part urges the valve from a fully-closed position toward the opening side. An ACT control part controls the electrically-operated actuator to drive. A set load of the valve urging part is smaller than a set load that is capable of returning the valve from a fully-closed position to an intermediate position only by urging force of the valve urging part. When a position of the valve at time of turning off an IG switch for stopping operation of an internal-combustion engine is on the closing side of the intermediate position, the ACT control part shifts the valve to the intermediate position by the electrically-operated actuator after the IG switch is turned off.

First claim

The invention claimed is:

1. A valve device comprising:
a body that defines a fluid flow path communicating with a combustion chamber of an internal-combustion engine;
a valve that is accommodated rotatably in the fluid flow path to vary an opening degree of the fluid flow path and that has:
a fully-open position that is a valve position at which a flow path area of the fluid flow path is maximized;
a fully-closed position that is a valve position at which the flow path area of the fluid flow path is minimized; and
an intermediate position that is a predetermined valve position between the fully-open position and the fully-closed position;

an electrically-operated actuator that rotates the valve toward its closing side or opening side;
a valve urging part that urges the valve from the fully-closed position toward the opening side; and
an ACT control part that controls the electrically-operated actuator to drive, wherein:
a set load of the valve urging part is smaller than a set load that is capable of returning the valve from the fully-closed position to the intermediate position only by urging force of the valve urging part; and
when a position of the valve at time of turning off an IG switch for stopping operation of the internal-combustion engine is on the closing side of the intermediate position, the ACT control part shifts the valve to the intermediate position by the electrically-operated actuator after the IG switch is turned off.

2. The valve device according to claim 1 , wherein:
the fluid flow path is a flow path through which intake gas or exhaust gas from the combustion chamber flows; and
the intermediate position is a position that is set as a valve position capable of avoiding freezing fixation between the valve and the body caused by condensation of moisture contained in intake gas or exhaust gas in the fluid flow path under a low-temperature environment.

Assignees

• Denso Corp

Inventors

• Fujinaka Yuuta
• Kobayashi Takashi
• Sasaki Kazushi

Classifications

• F02D9/02 Primary

  concerning induction conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02M35/10393

  for characterising a multi-component mixture, e.g. for the composition such as humidity, density or viscosity · CPC title

• F02D9/04

  concerning exhaust conduits (throttle valves, or arrangements thereof in conduits F02D9/08) · CPC title

• F02D41/1493

  Details · CPC title

• F16K31/041

  for rotating valves (F16K31/055 takes precedence) · CPC title