Transducer for engine fuel injection monitoring

• US 4,027,536 A
• Filed: 05/21/1976
• Issued: 06/07/1977
• Est. Priority Date: 10/20/1975
• Status: Expired due to Term

• Current Assignee: National Research Council Canada
• Original Assignee: Canadian Patents and Development Limited
• Inventors: Heggie, William S.
• Primary Examiner(s): Gill, James J.
• Assistant Examiner(s): Ciarlante, Anthony V.
• Application Number:
  US05/688,908
• Time in Patent Office: 382 Days
• Field of Search: 73/113, 73/398 AR, 73/119 A, 338/4, 338/36
• US Class Current: 73/730
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02M 65/003 Measuring variation of fuel pressure in high pressure line
• CPC Class Codes: G01F 1/34 by measuring pressure or differential pressure
• CPC Class Codes: G01L 9/0001 Transmitting or indicating the displacement of elastically deformable gauges by electric, electro-mechanical, magnetic or electro-magnetic means G01L9/0026, G01L9/0033, G01L9/0082, G01L9/0089, G01L9/0091 take precedence
• CPC Class Codes: G01L 9/0002 using variations in ohmic resistance G01L9/0051 takes precedence

Abstract

A transducer for diesel fuel injection monitoring comprising a barrel-shaped housing made of strong metal encompassing the fuel line tube and fixedly attached to the tube circumferentially at outer positions and defining an enclosed annular volume, a pressure measuring element positioned in the said volume away from the fuel tube and adjacent the inner wall of the housing, and a solid cold flowing material completely filling the volume between the fuel tube and the housing with the pressure measuring embedded therein. In a preferred version of the transducer is split to enable easy installation.

Claims

1. A fuel injection monitoring transducer for mounting on the fuel injection lines of engines comprising:

a. a barrel-shaped housing made of a strong metal material encompassing the fuel line tube and fixedly attached to the tube circumferentially at outer positions and defining an enclosed annular volume between tube and housing,

b. a pressure measuring element positioned in the said volume away from the fuel tube and adjacent the inner wall of the housing,

c. a solid cold flowing material completely filling the said volume, and

d. electrical leads from the element to the exterior of the housing.

2. A fuel injection monitoring transducer as in claim 1 wherein the solid cold flowing material is epoxy resin.

3. A fuel injection monitoring transducer as in claim 1 wherein the pressure measuring element is a strain gauge element with an associated backing layer of compressible material positioned between the strain gauge element and the inner wall.

4. A fuel injection monitoring transducer as in claim 1 wherein the pressure measuring element is a piezo-electric crystal.

5. A fuel injection monitoring transducer as in claim 3 wherein the backing layer is rubber.

6. A fuel injection monitoring transducer as in claim 4 wherein the pressure measuring element comprises three piezo-electric crystals mounted in the transducer annular volume and spaced apart approximately 120°

angles from each other

7. A fuel injection monitoring transducer as in claim 1 wherein the housing is in the form of split sections that are positioned around the fuel line and then fixed together with a strong adhesive material.

8. A fuel injection monitoring transducer as in claim 1 wherein the housing is in the form of split sections that are positioned around the fuel line and then fixed together with a mechanical clamping means.