Knocking Sensor Assembly With Curved Interface for Stable Measurement
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Solution Overview
Problem
The installation and maintenance of knocking sensors in internal combustion engines are complex due to the sensitivity of vibration and sound transmission, which can be affected by small changes in the structural connection between the engine and the sensor, leading to inconsistent measurement results.
Innovation Solution
A knocking sensor assembly with a connecting element and a structural interface featuring a curved first supporting surface and a complementary designed second supporting surface, allowing for a force-fitting connection and uniform surface pressure, simplifying the installation and alignment process by ensuring proper alignment and consistent measurement conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional structural connection is used between the engine and knocking sensor, then the sensor can be mounted on the engine, but small changes or modifications in the connection affect vibration or sound transmission and change measurement results
Solution Approach 1:
The patent applies a curved interface between the connecting element and knocking sensor, where at least one of the contacting surfaces is curved rather than flat. This curved interface ensures uniform contact pressure distribution across the entire contact area, compensating for manufacturing tolerances and misalignments. The curvature allows the surfaces to conform to each other more effectively, maintaining consistent vibration and sound transmission characteristics regardless of small variations in mounting conditions, thereby improving measurement reliability without increasing installation complexity.
2Measurement precision
If precise alignment is required for consistent measurement conditions, then measurement precision is improved, but the installation effort and complexity increase greatly
Solution Approach 1:
The curved interface surfaces automatically self-align when brought into contact, as the curvature allows for tolerance compensation in multiple directions simultaneously. This self-aligning feature eliminates the need for precise manual alignment during installation, as the curved surfaces will naturally conform to each other within a range of angular and positional variations. The result is that consistent measurement conditions are achieved without requiring great installation effort or precision alignment procedures.
Solution Approach 2:
The patent changes the geometric parameter of the interface from flat to curved, which fundamentally alters how contact is achieved. The curved geometry transforms the alignment requirement from a critical parameter to a non-critical one, as the curvature absorbs variations in position and orientation. This parameter change allows the system to maintain measurement precision while dramatically simplifying the installation process.
Data Source
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AI summary
The present invention refers to a knocking sensor assembly (10) for an internal combustion engine, comprising a knocking sensor (20), a connecting element (22) configured to mount the knocking sensor (20) on the engine, and a structural interface (43) which, in a mounted state of the knocking sensor assembly (10), is provided between a head (26) of the connecting element (22) and the knocking sensor (20). The structural interface (43) is constituted by a curved first supporting surface (44) and a complementary designed second supporting surface (46).