Propulsion Assembly With Driven Intake Compressor for Low-Speed Boost
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Solution Overview
Problem
Turbochargers in motor vehicles with internal combustion engines are inefficient at low engine speeds due to insufficient enthalpy of exhaust gases, leading to suboptimal supercharging.
Innovation Solution
A propulsion assembly with a reverse engine configuration allowing auxiliary devices to be positioned above the engine, featuring multiple turbochargers and an additional compressor with a bypass system and control valve to enhance air compression, and a transmission group with a clutch and gear train to optimize torque and speed transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a turbocharger is used for supercharging the internal combustion engine, then power delivery is improved, but supercharging efficiency deteriorates at low engine speeds due to insufficient exhaust gas enthalpy
Solution Approach 1:
The propulsion assembly segments the supercharging function into multiple independent turbochargers (first turbocharger and second turbocharger), each capable of operating independently or in combination. This segmentation allows the system to optimize performance across different engine speed ranges by selectively activating appropriate turbochargers, thereby maintaining supercharging efficiency both at low and high engine speeds.
Solution Approach 2:
The system dynamically switches between different turbocharger configurations based on engine operating conditions. A switching mechanism selectively connects or disconnects the first and second turbochargers from the engine's intake and exhaust systems, enabling optimal supercharging efficiency across the entire engine speed range by adapting the configuration to match current operational demands.
2Use of energy by moving object
If multiple turbochargers are added to improve low-speed supercharging, then device complexity increases
Solution Approach 1:
Each turbocharger in the system is designed with multi-functionality, capable of serving different supercharging needs across various engine operating conditions. The first and second turbochargers can individually or collectively provide supercharging, allowing the system to maintain simplicity in individual component design while achieving complex system-level performance through versatile component functionality.
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
Maintains high supercharging efficiency at low engine speeds and reduces unnecessary compression at high speeds, improving overall engine performance and power delivery.
Implementation Method 1
a turbine (11) adapted to expand exhaust gases of the engine (6), thus generating work
Implementation Method 2
a compressor (12) adapted to compress air by means of the work generated by the turbine (11)
Data Source
Figure 1
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AI summary
A propulsion assembly for a motor vehicle includes an internal combustion engine (6) comprising at least one movable member (21) as a function of an operating speed of said engine (6), a turbocharger (10) comprising a turbine (11) adapted to expand exhaust gases of said engine (6) to generate work and a first compressor (12) adapted to compress air by means of the work generated by the turbine (11), an intake line (19) connecting an outlet of the first compressor (12) to an intake manifold (15) of said engine (6) to supply compressed air from the first compressor (12) to said engine (6), characterized in that the intake line (19) comprises a second compressor (22), which in turn comprises a compressor shaft (23) rotatable about a first axis (Y) and is configured to further compress the compressed air from the first compressor (12) via a rotation of the compressor shaft (23). The propulsion assembly further comprises mechanical transmission means (25) configured to couple the movable member (21) to the compressor shaft (23), thereby determining a transmission of motion from the movable member (21) to the compressor shaft (23).