Electromagnetic Wave Back Introduction Blocking Module for Ignition Systems
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Solution Overview
Problem
Mild hybrid electric vehicles (MHEVs) face issues with back introduction of electromagnetic wave noise into the ignition (IG) system, leading to malfunctions in electronic components, despite attempts to bypass this noise using CLC filters, which often introduce more noise.
Innovation Solution
An electromagnetic wave back introduction blocking module is proposed, comprising a front capacitor module, a central coil module, and a rear capacitor module connected in series between the IG system and the converter, utilizing capacitors and coils to block noise introduced from the ground and converter, effectively reducing electromagnetic wave noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a CLC filter is used to bypass IG noise, then electromagnetic wave noise is reduced, but more IG noise is introduced
Solution Approach 1:
The filter is divided into three distinct modules (front capacitor module, central coil module, rear capacitor module) connected in series. Each module performs a specific function in the noise filtering process, allowing progressive attenuation of electromagnetic wave noise without introducing additional IG noise, thereby resolving the contradiction between noise reduction and noise introduction.
Solution Approach 2:
Different components with specific local characteristics are used in each module: capacitor parts for high-frequency noise filtering and coil parts for electromagnetic interference suppression. This localized functional differentiation enables effective noise blocking at each stage while maintaining system stability and preventing IG noise generation.
2Object-affected harmful factors
If noise filtering components are added to the IG system, then electromagnetic wave noise is blocked, but device complexity increases
Solution Approach 1:
The filtering function is segmented into three modular units that can be independently designed, analyzed, and implemented. This segmentation makes the complex noise filtering task manageable while maintaining a clear structural organization that reduces overall system complexity compared to a monolithic filter design.
Solution Approach 2:
The filter modules serve multiple functions: they block electromagnetic wave noise, prevent IG noise introduction, and maintain signal integrity. This multi-functionality reduces the need for additional separate components, thereby managing device complexity while achieving comprehensive noise protection.
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
The solution significantly reduces electromagnetic wave noise intensity by 10 dBμV in specific frequency bands, improving voltage response characteristics and preventing malfunctions in vehicle electronic components.
Implementation Method 1
a first capacitor part connected between the other side of the first coil part and a ground, a second capacitor part connected between the other side of the second coil part and the ground
Implementation Method 2
a first coil part including one or more coils having one side connected to the IG system in series, a second coil part including one or more coils having one side connected to the other side of the first coil part
Data Source
AI summary
An apparatus, as an electromagnetic wave back introduction blocking module connected between an ignition (IG) system and a converter, includes a front capacitor module which includes a first coil part including one or more coils having one side connected to the IG system in series and a first capacitor part connected between the other side of the first coil part and a ground, a central coil module which includes a second coil part including one or more coils having one side connected to the other side of the first coil part and a second capacitor part connected between the other side of the second coil part and the ground, and a rear capacitor module which includes a third capacitor part having one side connected to the other side of the second coil part. The rear capacitor module is connected to the converter.