Hybrid Supercharging Engine Control Reducing Back Pressure
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Solution Overview
Problem
Existing engine control systems face challenges in achieving high compression ratios, minimizing abnormal combustions, and reducing manufacturing costs, particularly due to the limitations of mechanical turbochargers and electric superchargers, which result in high back pressure and the need for expensive waste gate valves.
Innovation Solution
An engine control apparatus and method that incorporates a high-capacity turbocharger and an electric supercharger, along with a throttle valve and driving information detector, to adjust engine torque based on driving regions, reducing back pressure and eliminating the need for a waste gate valve by optimizing air supply and exhaust gas management.
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 back pressure increases causing abnormal combustions
Solution Approach 1:
The patent combines a mechanical turbocharger with an electric supercharger to create a hybrid supercharging system. The electric supercharger compensates for the high back pressure caused by the mechanical turbocharger, allowing the system to maintain high compression ratios without the harmful back pressure effects. This merging of two different supercharging mechanisms resolves the contradiction between achieving high compression ratio and avoiding abnormal combustions.
Solution Approach 2:
The electric supercharger acts as an intermediary component that mediates between the mechanical turbocharger and the combustion chamber. It provides additional air supply to offset the restrictive effect of the mechanical turbocharger's back pressure, thereby enabling high compression operation without causing knocking or pre-ignition.
2Productivity
If a waste gate valve is used to control exhaust gas flow, then turbocharger performance is optimized, but manufacturing cost increases
Solution Approach 1:
The patent removes the waste gate valve from the system by utilizing the electric supercharger to control air supply independently. The electric supercharger's motor-controlled operation provides sufficient flexibility to manage exhaust gas flow and turbocharger performance without requiring an additional waste gate valve, thereby reducing manufacturing costs while maintaining performance.
Solution Approach 2:
The electric supercharger serves multiple functions simultaneously: it provides air supply for combustion, controls turbocharger operation, and manages exhaust gas flow. This self-service capability eliminates the need for separate control components like the waste gate valve, simplifying the system and reducing costs.
3Speed
If an electric supercharger is used to supply compressed air, then responsiveness is improved, but output is limited by electric system constraints
Solution Approach 1:
The patent merges the electric supercharger with a mechanical turbocharger to create a hybrid system that combines the responsiveness advantages of the electric motor with the high-power capabilities of the exhaust-driven turbine. The electric supercharger provides immediate response at low speeds, while the mechanical turbocharger takes over at higher speeds and loads, overcoming the power limitations of the electric system alone.
Solution Approach 2:
The system operates in different modes depending on engine conditions: the electric supercharger operates primarily at low to middle speeds where responsiveness is critical, while the mechanical turbocharger becomes dominant at high speeds and loads. This periodic switching between different power sources optimizes both responsiveness and power output across the entire operating range.
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 solution enables improved fuel consumption, reduced abnormal combustions, and lower manufacturing costs by maximizing compression ratios and eliminating the expensive waste gate valve, while minimizing back pressure through intelligent control of the throttle valve and electric supercharger.
Implementation Method 1
a turbine rotated by pressure of exhaust gas exhausted from the engine
Implementation Method 2
a compressor of the turbocharger compresses fresh air flowing in from the outside
Implementation Method 3
an electric supercharger compresses external air using a compressor operated by a motor
Data Source
AI summary
An apparatus for controlling an engine includes an engine including a plurality of combustion chambers for generating driving torque by burning a fuel, a high-capacity turbocharger including a turbine rotated by the exhaust gas exhausted from the combustion chambers and a compressor rotated together with the turbine for compressing exhaust gas exhausted from the combustion chamber, an electric supercharger including a motor and an electric compressor operated by the motor, a throttle valve for adjusting an intake air amount supplied to the combustion chamber, a driving information detector for detecting driving information including a required torque and an engine speed, and a controller for determining a driving region of the engine from the driving information detected by the driving information detector, and controlling engine torque by adjusting an opening of the throttle valve and an output of the motor according to the driving region of the engine.