E-booster Bypass for Low-Speed Engine Response
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Solution Overview
Problem
Internal combustion engines face challenges in improving response behavior and acceleration at low engine speeds due to the reliance on exhaust gas turbochargers, which require high engine speeds or power output to generate sufficient charge pressure, leading to weaknesses in starting and acceleration.
Innovation Solution
An e-booster is positioned downstream of the charge air cooler in a bypass line to the throttle valve, with a check valve ensuring that compressed air from the e-booster is only introduced when the exhaust gas turbocharger generates sufficient charge pressure, and can be switched on to provide additional supercharging when needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an exhaust gas turbocharger is used for supercharging, then engine power output is improved, but response behavior and acceleration at low engine speeds deteriorate
Solution Approach 1:
The patent combines an exhaust gas turbocharger and an electrically driven compressor (e-booster) into a hybrid supercharging system. The e-booster provides immediate boost pressure at low engine speeds, while the exhaust gas turbocharger contributes at higher speeds, merging the advantages of both systems to resolve the contradiction between power output and low-speed response.
Solution Approach 2:
The e-booster is activated before the exhaust gas turbocharger can build sufficient charge pressure, particularly at low engine speeds. This preliminary action by the electrically driven compressor ensures immediate air delivery to the combustion chambers, overcoming the delay inherent in turbocharger spool-up time.
2Speed
If an e-booster is added to improve low-speed response, then acceleration behavior is improved, but device complexity increases
Solution Approach 1:
The e-booster is designed to serve multiple functions: it provides boost pressure at low engine speeds, assists the exhaust gas turbocharger during transient conditions, and can operate independently or in combination with the turbocharger. This multi-functionality justifies the additional complexity by providing versatile performance enhancement across the entire operating range.
Solution Approach 2:
The e-booster acts as an intermediary between the air intake system and the exhaust gas turbocharger, particularly during low-speed operation. It mediates the air delivery process by providing the necessary charge pressure when the exhaust gas turbocharger alone is insufficient, thereby improving acceleration behavior without requiring complete system redesign.
3Power
If additional compressed air is introduced via a compressed air reservoir, then starting weaknesses are overcome, but device complexity and air delivery system complexity increase
Solution Approach 1:
The e-booster is directly coupled to the air intake system and can immediately draw in and compress ambient air when needed, without requiring a pre-filled compressed air reservoir. This self-service capability eliminates the need for complex reservoir management systems while maintaining the ability to overcome starting weaknesses through on-demand air compression.
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 enhances the supercharging device's effectiveness across all desirable ranges by ensuring consistent and efficient air delivery to the combustion chambers, improving engine performance without relying solely on exhaust gas turbocharger-generated pressure.
Implementation Method 1
the compressor part of a low pressure supercharging device
Implementation Method 2
at least one exhaust gas turbocharger
Implementation Method 3
at least one charge air cooler arranged in the outflow of the exhaust gas turbocharger
Implementation Method 4
an additional compressor (e-booster) that can be driven electrically
Implementation Method 5
additional compressor (e-booster) that can be driven electrically
Implementation Method 6
The check valve that prevents a return flow of the charge air in the direction of the exhaust gas turbocharger
Data Source
AI summary
A supercharging device is provided for an internal combustion engine that has at least one exhaust gas turbocharger (1, 2) and at least one charge air cooler (LLK) arranged in the outflow of the exhaust gas turbocharger (1, 2). An additional electrically driven compressor (e-booster 6, 7) is arranged downstream of the charge air cooler (LLK) in a bypass (5) to the main flow line (3) to the throttle valve (4) of the internal combustion engine. The main flow line (3) can be closed by a check valve (9) that acts in the direction of a return flow.