Spark Plug Connector Inductance Layout for EMI Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Internal combustion engines experience significant electromagnetic interference emissions during ignition, which conventional suppression measures struggle to reduce effectively.
Innovation Solution
A spark plug connector with an electrical line route containing inductance elements adjacent to the ignition coil, reducing electromagnetic interference radiation by incorporating multiple inductors and ohmic resistance in the line route, and optionally omitting a shield plate to enhance interference suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional interference suppression measures are used, then the structure remains simple, but electromagnetic interference radiation is significantly reduced only with difficulty and to a limited extent
Solution Approach 1:
An inductance element is introduced as an intermediary component in the electrical line route between the ignition coil and spark plug. This inductance acts as a mediator that suppresses electromagnetic interference by filtering high-frequency noise signals while allowing the ignition voltage to pass through, thereby reducing EM radiation without requiring complex shielding structures.
Solution Approach 2:
The electrical line route is modified by changing its electrical parameters - specifically by adding inductance (L) to the circuit. This parameter change transforms the electrical line from a simple conductor into an LC filter circuit that naturally attenuates high-frequency electromagnetic interference, achieving suppression without increasing structural complexity.
2Object-affected harmful factors
If multiple inductors and ohmic resistance are added to the electrical line route, then electromagnetic interference suppression is enhanced, but the device complexity increases
Solution Approach 1:
The electrical line route is segmented into multiple sections with distributed inductors and resistance elements. Instead of using a single complex suppression component, the interference suppression function is divided into multiple simpler elements (inductors L1, L2 and resistance R1) placed at different locations along the electrical line, achieving cumulative suppression effect while maintaining modular simplicity.
3Device complexity
If a shield plate is omitted from the spark plug connector, then the device complexity is reduced, but electromagnetic interference suppression may be compromised
Solution Approach 1:
The shield plate component is extracted (removed) from the spark plug connector design. The electromagnetic interference suppression function previously provided by the shield plate is transferred to the inductance elements in the electrical line route, allowing the connector structure to be simplified without sacrificing interference suppression performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Significantly reduces electromagnetic interference radiation by up to 10-30 dB mV/m, as shown in logarithmic representation, when a spark plug is ignited, compared to conventional suppression measures.
Implementation Method 1
The electrical line route has at least one inductance, preferably immediately adjacent to the first end section... the at least one inductance is located in the region of the end of a spark plug shaft or in the region of a valve cover
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3D
AI summary
Spark plug connector with a connector body (1) which has a first end section (2) for inserting an end of a high-voltage line (4) and a second end section (3) for receiving an end of a spark plug (5), wherein an electrical conductor for transmitting an ignition voltage from the high-voltage line (4) to the spark plug (5) is arranged between the first end section (2) and the second end section (3), and wherein the electrical conductor has at least one inductor (6) following the first end section (2), internal combustion engine (11) with at least one arrangement of a spark plug (5) and such a spark plug connector, and arrangement with a mechanically driven device (12) and at least one such internal combustion engine (11) for driving the mechanically driven device (12).