Supercharger for Engine Braking and Transient Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Modern internal combustion engines face challenges in transient response capability and engine braking performance due to downspeeding, downsizing, lower compression ratios, and Miller cycling, which affect efficiency and emissions.
Innovation Solution
A spark-ignited internal combustion engine with a supercharger device that provides a compression boost to the intake flow during engine braking and transient events, using a clutched or electronically controlled compressor to enhance torque response and braking power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine is downsized and downspeeded to improve fuel efficiency, then fuel efficiency is improved, but transient response capability and engine braking performance deteriorate
Solution Approach 1:
The supercharger compresses the intake air before it enters the combustion chamber, storing potential energy in the form of pressurized air. This preliminary compression action allows the engine to deliver improved transient response and braking performance without requiring larger engine displacement or higher RPM capability.
2Use of energy by moving object
If the compression ratio is reduced to improve efficiency, then fuel efficiency is improved, but engine braking performance deteriorates
Solution Approach 1:
The supercharger acts as an intermediary device that decouples the relationship between compression ratio and intake charge density. By providing forced induction, the supercharger compensates for the lower compression ratio, maintaining adequate charge density for both efficiency and braking performance without requiring high mechanical compression.
3Use of energy by moving object
If Miller cycling is employed to improve efficiency, then fuel efficiency is improved, but transient response capability deteriorates
Solution Approach 1:
The supercharger system provides dynamic control over the intake charge, allowing the engine to rapidly adapt to changing load and speed conditions. The forced induction capability enables quick changes in manifold pressure and air flow, improving transient response while maintaining the efficiency benefits of Miller cycling through controlled intake timing.
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
Improves engine braking and transient response capabilities by increasing air charge density and compression ratio, thereby enhancing energy absorption and power delivery during braking and transient conditions.
Implementation Method 1
a supercharger device is employed so that, in response to engine braking events and transient events associated with the internal combustion engine, a compression boost of the intake flow is provided
Data Source
AI summary
A supercharger device is employed in response to engine braking events and transient events to provide further compression of the intake flow and boost engine braking power and torque response. The supercharger device can be, for example, a clutched supercharger or an electronic compressor connected in the intake system of the internal combustion engine.