Device for measuring cylinder deformations in piston-type internal-combustion engines

US5675076A · kind A · utility

Assignee

• FEV Motorentechnik GmbH & Co. Kommanitgesellschaft · DE

Inventors

• Thomas Esch · Kaarst, DE
• Albert L. Haas · Cass City, US
• Juergen Orgrzewalla · Emmelshausen, DE
• Franz Koch · Augsburg, DE

Key dates

• Filing date: Jan 25, 1996
• Grant date: Oct 7, 1997
• Expiry date: Jan 25, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B7/14
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A piston-type internal combustion engine includes an engine cylinder; a piston slidably received in the engine cylinder; and a device, carried by the piston, for measuring deformations in the cylinder wall. The piston has at least two radial bores. The measuring device includes a separate carrier element disposed in each radial bore. The carrier elements are attached to the piston in a region of the piston axis such as to be displaceable relative to the radial bores, whereby a relative motion between the piston and each carrier element is provided upon radial expansion and contraction of the piston. The measuring device further includes a separate, electrically inductive path sensor, which is electrically connectable to a measuring and evaluating device, and which is attached to a respective carrier element such that the path sensor remains out of contact with the cylinder wall at all times during movement of the piston relative to the engine cylinder. The radial position of each path sensor is, by virtue of the floatingly attached carrier elements, independent from radial expansions and contractions of the piston.