Compressed Air Reservoir for Turbocharged Engine Boost
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Solution Overview
Problem
Supercharged internal combustion engines face limitations in rapidly increasing air supply during transient load conditions, leading to delayed power output due to the energy constraints of exhaust gas turbochargers, which restricts the combustion air ratio and affects efficiency and emissions.
Innovation Solution
A method that divides the charge air supply between a primary charge air path and a separate compressed air reservoir, allowing a portion of combustion chambers to receive increased air volume and pressure during boost operations, thereby overcoming the limitations of traditional systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If exhaust gas turbocharger is used for supercharging, then energy efficiency is improved, but power output responsiveness deteriorates due to turbo lag
Solution Approach 1:
A compressed air reservoir is pre-filled with compressed air during periods when the engine does not require maximum power. During transient load conditions or acceleration, this pre-stored compressed air is rapidly supplied to the combustion chambers, eliminating the delay associated with turbocharger response while maintaining energy efficiency during steady-state operation.
2Quantity of substance
If charge air compressor power is increased to force more air into combustion chambers, then air supply rate is improved, but device complexity increases
Solution Approach 1:
The air supply system is segmented into two independent sources: the exhaust gas turbocharger for steady-state operation and a separate compressed air reservoir for transient high-power demands. This segmentation allows each component to be optimized for its specific operating condition without increasing overall system complexity.
Solution Approach 2:
The compressed air reservoir acts as an intermediary between the turbocharger and the combustion chambers. It stores compressed air during low-demand periods and releases it during high-demand periods, mediating the mismatch between turbocharger response characteristics and engine power requirements.
3Power
If fuel supply rate is increased to achieve higher power output, then power output is improved, but soot formation increases due to insufficient air volume
Solution Approach 1:
Instead of relying solely on the turbocharger to provide the air volume needed for complete combustion during transient conditions, the system copies the function of air compression by using pre-compressed air from the reservoir. This ensures that sufficient oxygen is available for complete fuel combustion, preventing soot formation while enabling high power output.
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 approach enables a highly dynamic increase in combustion air supply, reducing turbo lag and enhancing power output responsiveness while maintaining efficient exhaust gas treatment by utilizing the existing air mass flow and adding compressed air directly to combustion chambers.
Implementation Method 1
a separate compressed air reservoir is provided from which n combustion chambers can be supplied with combustion air taken from there
Data Source
AI summary
The disclosure relates to a method for operating a supercharged internal combustion engine having at least one cylinder group with a number n of combustion chambers, wherein, during a first operating state, all n combustion chambers are supplied with combustion air via a primary charge air path and, during a second operating state, only a portion of the n combustion chambers are supplied with combustion air from the primary charge air path and another portion of the n combustion chambers are supplied with combustion air from a separate compressed air reservoir.