Boosted Engine Intake Bypass Line for Turbo-Lag Reduction
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Solution Overview
Problem
Turbocharged engines experience torque drops at low engine speeds due to reduced exhaust gas mass flow and charge pressure, leading to inefficient compressor operation and delayed response during transient conditions, with existing solutions increasing complexity and cost or being non-adaptable to axial compressors.
Innovation Solution
A compressor surge line system with a bypass line and shut-off elements that redirect charge air to increase velocity and accelerate the impeller, using compressed air to quickly meet load demands, thereby enhancing low-end torque and response times without additional complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is used to boost engine power, then peak power output increases, but torque drops at low engine speeds due to reduced exhaust gas mass flow
Solution Approach 1:
The invention divides the air supply path into two separate paths: a main intake path and a bypass line. The bypass line allows air to reach the compressor inlet independently of the throttle valve, creating segmented flow paths that can be controlled separately to maintain compressor operation at low engine speeds
Solution Approach 2:
The bypass line acts as an intermediary pathway that introduces air directly to the compressor inlet, bypassing the throttle valve restriction. This intermediary path ensures adequate air supply to the compressor even when the main intake path is restricted, maintaining torque at low engine speeds
2Power
If the compressor is accelerated to higher rotational speeds to meet increased load demand, then charge pressure increases, but response time is delayed due to turbine spin-up time
Solution Approach 1:
The bypass line is pre-configured to provide a direct air supply path to the compressor inlet that can be activated immediately when needed. This preliminary arrangement allows the compressor to receive air without waiting for turbine spin-up, reducing the time delay during transient load conditions
3Force
If multiple turbochargers are staged in parallel or series to increase low-end torque, then compressor surge limit is shifted toward smaller flows, but device complexity and cost increase
Solution Approach 1:
The invention extracts the function of providing adequate air supply to the compressor from the complex multi-turbocharger system and implements it through a simple bypass line with a control valve. This extraction achieves the same low-end torque enhancement without the complexity of multiple turbochargers
Solution Approach 2:
The bypass line system uses the engine's own intake air as the working fluid, eliminating the need for additional turbochargers or external air sources. The system serves itself by utilizing already-present air resources to achieve the desired performance improvement
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
The system effectively increases low-end engine torque and reduces turbo-lag by optimizing charge air flow and accelerating the compressor, providing a compact and efficient solution for turbocharged engines.
Implementation Method 1
redirect charge air to increase velocity and accelerate the impeller
Implementation Method 2
The compressor, coupled to an intake system of the engine, conveys and compresses intake air, increasing charging of cylinders of the engine
Implementation Method 3
The hot exhaust gas flow is fed to the turbine and expands in the turbine with a release of energy, rotating a shaft coupled to the compressor
Data Source
AI summary
Methods and systems are provided for a boosted internal combustion engine. In one example, a system may include an intake system for supplying charge air, a compressor arranged in the intake system, a first shut-off element arranged in the intake system upstream of an impeller of the compressor, a bypass line that branches off from the intake system upstream of the first shut-off element and that rejoins the intake system upstream of the impeller, a second shut-off element arranged in the bypass line, a compressed air line that opens into the bypass line downstream of the second shut-off element, and a third shut-off element arranged in the compressed air line. A map width of the compressor may be increased by providing airflow to the impeller via the bypass line during low mass flow conditions, and impeller acceleration may be expedited by providing compressed air via the compressed air line.