Two-Stage Supercharging Altitude Adaptability
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Solution Overview
Problem
Existing supercharging systems for internal combustion engines, particularly those with single-stage exhaust gas turbochargers, face challenges in maintaining high engine power at varying geodetic altitudes and struggle to provide sufficient engine output for applications like tracked vehicles, as the rotational speed of the turbocharger increases with altitude, leading to power reduction.
Innovation Solution
A control and regulation method utilizing a two-stage supercharging process with a low-pressure and high-pressure stage, supplemented by a third compressor stage in low-power ranges, where the charge air is pre-compressed and post-compressed, and the boost pressure is regulated by controlling turbine and compressor bypass valves to maintain optimal engine performance across different altitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single-stage exhaust gas turbocharger is used, then the engine can operate at high altitudes, but the rotational speed of the turbocharger increases with altitude causing power reduction
Solution Approach 1:
The single-stage turbocharger is divided into two independent stages: a low-pressure stage (first exhaust gas turbocharger) and a high-pressure stage (second exhaust gas turbocharger). Each stage has its own turbine and compressor, allowing independent operation and optimization. This segmentation enables the system to maintain optimal turbocharger speeds at different altitudes while preventing power reduction.
2Power
If a two-stage supercharging process is used, then high engine power can be maintained, but the system complexity increases
Solution Approach 1:
The two-stage supercharging system merges the low-pressure and high-pressure stages into a unified exhaust gas utilization system. The exhaust gas flows sequentially through both stages, and the control unit coordinates both stages as a single system. This merging approach maintains high engine power while managing system complexity through integrated control.
Solution Approach 2:
The system dynamically switches between different operating modes (low-pressure only, high-pressure only, or both stages combined) based on real-time conditions such as altitude, engine load, and speed. The control unit continuously adjusts the operation of each stage to optimize performance while adapting to changing conditions, thereby managing complexity through intelligent dynamic control.
3Adaptability or versatility
If the turbocharger rotational speed increases with altitude, then the engine can operate at high altitudes, but torque loss occurs at low speeds
Solution Approach 1:
Different stages of the supercharging system are optimized for different operating conditions: the low-pressure stage is optimized for low-speed torque generation, while the high-pressure stage is optimized for high-altitude operation. This local optimization ensures that each stage contributes its specific strength, maintaining torque at low speeds while enabling high-altitude capability.
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 solution enables high engine power output independently of geodetic altitude, reduces torque loss at low speeds, and ensures quick boost pressure buildup, preventing power reduction with increasing altitude, thus providing consistent performance across varying conditions.
Implementation Method 1
an exhaust-gas turbocharger (3, 4, 5) consisting of a compressor (6) and a turbine (7) subjected to exhaust gas
Implementation Method 2
a compressor for conveying charge air
Implementation Method 3
An electrically controllable turbine bypass valve (8) is arranged parallel to the high-pressure turbine (7)
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
The invention relates to a control method for a charged internal combustion engine, wherein in a high-performance range (HLB) the charge air is supplied to the internal combustion engine after the air has been precompressed via a two-stage charging process composed of a low pressure stage and a high pressure stage, and wherein in a low-performance range (NLB) the charge air that has been precompressed via the two-stage charging process is supplied to the internal combustion engine after it has been post-compressed via a compressor as the third charging stage.