Electric Supercharger Engine System for High Compression Ratio
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Solution Overview
Problem
Existing engine systems face challenges in achieving a high compression ratio due to low responsiveness and high back pressure issues with mechanical turbochargers, and electric superchargers are limited in power output and application scope.
Innovation Solution
The engine system incorporates multiple intake lines with electric superchargers, a bypass line, and a cylinder deactivation apparatus, allowing for adjustable valve operations and series/parallel operation of electric superchargers to optimize air compression and reduce unnecessary pumping losses across different engine regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical turbocharger is used to increase compression ratio, then combustion efficiency is improved, but responsiveness deteriorates due to high back pressure
Solution Approach 1:
The patent divides the air compression function into two separate electric superchargers (first and second electric superchargers) positioned in different intake lines, allowing independent control of each supercharger to optimize responsiveness while achieving high compression ratio through coordinated operation
Solution Approach 2:
The patent replaces the mechanical turbocharger system with an electric supercharger system that uses electric motors instead of exhaust gas-driven turbines, eliminating the mechanical connection to the exhaust system and thereby removing the back pressure problem while maintaining compression capability
2Quantity of substance
If a mechanical turbocharger is used to supply sufficient air, then combustion efficiency is improved, but back pressure increases causing responsiveness issues
Solution Approach 1:
The patent substitutes the mechanical turbocharger with electric superchargers that draw power from the battery rather than exhaust gas pressure, completely eliminating the source of back pressure while maintaining the capability to supply sufficient compressed air to the cylinders
Solution Approach 2:
The patent introduces a bypass line with a bypass valve as an intermediary pathway that allows air to flow around the superchargers when full compression is not needed, providing a pressure relief mechanism that prevents back pressure buildup while maintaining air supply capability
3Speed
If electric supercharger is used to improve responsiveness, then turbo lag is reduced, but power output is limited by battery capacity
Solution Approach 1:
The patent merges the output of two electric superchargers working in parallel, combining their compression capabilities to generate sufficient total power output that overcomes the limitation of individual supercharger power, while maintaining the responsiveness benefits of electric drive
Solution Approach 2:
The patent implements dynamic control where the opening degrees of intake valves and bypass valve are adjusted based on engine operating conditions (speed and load), allowing the system to optimize between using one or both superchargers and the bypass line to match power demand with battery capacity
4Power
If mechanical turbocharger is exposed to high temperature exhaust gas, then compression function is achieved, but design costs of peripheral parts increase
Solution Approach 1:
The patent replaces the exhaust gas-driven turbocharger with an electrically-powered supercharger system that is positioned in the intake path away from exhaust gases, eliminating exposure to high temperatures and thereby reducing the thermal management requirements and design costs of peripheral components
Solution Approach 2:
The patent extracts the compression function from the exhaust system environment and relocates it to the intake system with electric superchargers, separating the compression function from the high-temperature exhaust gas environment and thereby eliminating the need for heat-resistant materials and thermal management designs
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
This configuration enables a high compression ratio, improved responsiveness, reduced fuel consumption, and lower manufacturing costs by leveraging the efficiency and reduced size of electric superchargers over mechanical turbochargers, while preventing abnormal combustion.
Implementation Method 1
an electric supercharger compresses external air using a compressor operated by a motor
Implementation Method 2
a main intercooler may be disposed in the main intake line
Data Source
AI summary
An engine system includes an engine including one or more cylinders for generating a driving torque, a plurality of intake lines for supplying external air to the one or more cylinders, and one or more electric superchargers disposed on, or in, the plurality of intake lines.