Dual Electric Supercharger Engine System for High Compression
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Solution Overview
Problem
Existing engine systems face challenges in achieving a high compression ratio due to low responsiveness of mechanical turbochargers and limited usage of electric superchargers, primarily due to high back pressure and temperature exposure, as well as restricted output power from vehicle batteries, which limits their application to low and middle speed regions.
Innovation Solution
An engine system incorporating two electric superchargers and a bypass valve, controlled by a controller to operate in single, serial, or parallel modes based on engine operating regions, optimizing the operation of the superchargers to enhance efficiency and energy use across different load and speed conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a mechanical turbocharger is used to increase compression ratio, then combustion efficiency is improved, but responsiveness is poor and back pressure increases
Solution Approach 1:
The system divides the intake air supply into two separate lines (first intake line and second intake line), each with its own electric supercharger. This segmentation allows independent control of each supercharger to optimize responsiveness while maintaining compression efficiency.
Solution Approach 2:
The patent replaces the mechanical turbocharger (driven by exhaust gas pressure) with electric superchargers driven by motors. This substitution eliminates the turbo lag and back pressure issues associated with mechanical turbochargers while maintaining the ability to compress intake air for improved combustion efficiency.
2Power
If a mechanical turbocharger is exposed to high temperature exhaust gas to operate, then compression function is achieved, but design cost of peripheral parts increases
Solution Approach 1:
The patent replaces the mechanical turbocharger system that requires exposure to high-temperature exhaust gas with electric superchargers. The electric motors drive the compressors directly without requiring thermal energy from exhaust gas, thereby eliminating the need for expensive heat-resistant peripheral components while maintaining compression functionality.
3Device complexity
If electric supercharger output is limited by battery capacity, then system simplicity is maintained, but usage is limited to low and middle speed regions
Solution Approach 1:
The system segments the power supply by providing dedicated batteries for each electric supercharger in addition to the main vehicle battery. This segmentation allows each supercharger to have sufficient power capacity to operate across the full speed range, not just limited to low and middle regions, while keeping the overall system architecture relatively simple.
Solution Approach 2:
The patent makes the electric supercharger system universally applicable across all operating conditions by enabling each supercharger to draw power from multiple sources (main battery and dedicated battery). This multi-functionality allows the system to adapt to various speed regions and load conditions without increasing operational complexity.
4Quantity of substance
If two electric superchargers operate in parallel to supply compressed air, then air supply quantity is increased, but system complexity increases
Solution Approach 1:
The patent implements dynamic control of the two electric superchargers through a controller that adjusts their operation modes (single mode, serial mode, or parallel mode) based on engine operating conditions. This dynamic adaptation allows the system to achieve high air supply quantity when needed while maintaining simpler operation during normal conditions, thereby managing system complexity effectively.
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 allows for improved driving efficiency and energy efficiency by operating the electric superchargers at optimal efficiency points, enhancing the engine's ability to achieve high compression ratios and expand the usage of electric superchargers beyond low and middle speed regions.
Implementation Method 1
a compressor of the turbocharger compresses fresh air flowing in from the outside
Implementation Method 2
an electric supercharger that compresses external air using a compressor operated by a motor
Implementation Method 3
a turbine of the turbocharger is rotated by pressure of exhaust gas exhausted from the engine
Implementation Method 4
An engine appropriately mixes air and fuel and generates driving power by burning the mixed gas
Data Source
AI summary
An engine may include a plurality of cylinders generating driving torque by burning fuel; a first intake valve disposed in a first intake line in which intake air supplied to the cylinders flows; a second intake valve disposed in a second intake line in which intake air supplied to the cylinders flows; a first electric supercharger disposed in the first intake line; a second electric supercharger disposed in the second intake line; a bypass valve disposed in a bypass line connecting the first intake line and the second intake line; and a controller for controlling the first electric supercharger and the second electric supercharger to be operated in a single mode, a serial mode, or a parallel mode based on an operating region of the engine determined by driving information.