Pressure Sensor

• US 20190323915A1
• Filed: 04/26/2017
• Published: 10/24/2019
• Est. Priority Date: 06/27/2016
• Status: Active Grant

• Current Assignee: Hitachi Astemo Ltd. (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: KAGA, Yusuke, MISAWA, Tomonari, MORITA, Kousaku, ONUKI, Hiroshi
• Granted Patent: US 10,704,977 B2
• Time in Patent Office: Days
• CPC Class Codes: G01L 19/0061 Electrical connection means
• CPC Class Codes: G01L 19/04 Means for compensating for effects of changes of temperature , i.e. other than electric compensation
• CPC Class Codes: G01L 19/06 Means for preventing overload or deleterious influence of the measured medium on the measuring device or vice versa
• CPC Class Codes: G01L 19/0645 using isolation membranes, specially adapted for protection
• CPC Class Codes: G01L 19/0681 Protection against excessive heat
• CPC Class Codes: G01L 19/147 Details about the mounting of the sensor to support or covering means
• CPC Class Codes: G01L 23/18 by resistance strain gauges
• CPC Class Codes: G01L 23/26 Details or accessories
• CPC Class Codes: G01L 23/28 Cooling means
• CPC Class Codes: G01L 23/32 Apparatus specially adapted for recording pressure changes measured by indicators
• CPC Class Codes: G01L 9/0092 using variations in ohmic resistance
• CPC Class Codes: G01M 15/05 by combined monitoring of two or more different engine parameters

Abstract

A pressure sensor includes a connection portion provided with a screw portion configured to fix the pressure sensor to a combustion chamber of a vehicle engine; a hollow liquid-enclosing container fixed to one end of the connection portion; a pressure transmission fluid enclosed inside the liquid-enclosing container; a diaphragm fixed to one end of the liquid-enclosing container and elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid; a pressure detection element fixed to the other end of the liquid-enclosing container and detecting the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal; and a heat-dissipating rod provided inside the liquid-enclosing container. The connection portion and the liquid-enclosing container, and the connection portion and the diaphragm are mechanically connected to each other by welding or the like.

Claims

1. A pressure sensor comprising:

a hollow liquid-enclosing container;

a pressure transmission fluid that is enclosed inside the liquid-enclosing container;

a diaphragm that is attached to the liquid-enclosing container and is elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid;

a pressure detection element that is attached to the liquid-enclosing container, and detects the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal; and

a heat dissipation member that is attached inside the liquid-enclosing container so as to be in contact with each of a part of an inner wall of the liquid-enclosing container and the pressure transmission fluid.

2. The pressure sensor according to claim 1, wherein

a surface of the heat dissipation member is formed as an uneven surface.

3. The pressure sensor according to claim 2, wherein

a plurality of grooves is provided on the surface of the heat dissipation member.

4. The pressure sensor according to claim 1, further comprising

a first heat-dissipating structural body that surrounds the heat dissipation member and is in contact with each of the part of the inner wall of the liquid-enclosing container and the pressure transmission fluid.

5. The pressure sensor according to claim 4, wherein

the first heat-dissipating structural body consists of a mesh-shaped or fibrous thin plate.

6. The pressure sensor according to claim 1, further comprising

a connection member that is connected to the liquid-enclosing container and has a screw portion configured to fix the liquid-enclosing container to a combustion chamber of an engine.

7. A pressure sensor comprising:

a hollow liquid-enclosing container;

a pressure transmission fluid that is enclosed inside the liquid-enclosing container;

a diaphragm that is attached to the liquid-enclosing container and is elastically deformed when receiving pressure to transmit the pressure to the pressure transmission fluid; and

a pressure detection element that is attached to the liquid-enclosing container, and detects the pressure transmitted to the pressure transmission fluid and converts the detected pressure into an electric signal,

wherein an inner wall of the liquid-enclosing container is formed as an uneven surface, the inner wall being in contact with the pressure transmission fluid, or

the pressure sensor further comprises a second heat-dissipating structural body that surrounds a part of the inner wall of the liquid-enclosing container and is in contact with a part of the inner wall.

8. The pressure sensor according to claim 7, wherein

a plurality of grooves is provided on the inner wall of the liquid-enclosing container.

9. The pressure sensor according to claim 7, wherein

the second heat-dissipating structural body consists of a mesh-shaped or fibrous thin plate.

10. The pressure sensor according to claim 7, further comprising

a connection member that is connected to the liquid-enclosing container and has a screw portion configured to fix the liquid-enclosing container to a combustion chamber of an engine.