Variable Inlet Guide Vanes for Turbocharger Transient Response
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Solution Overview
Problem
Heavy-duty vehicles face challenges in optimizing transient response times due to the limitations of fixed geometry turbochargers, which struggle to accelerate to sufficient boost pressure at low engine loads, affecting fuel efficiency and emissions compliance.
Innovation Solution
A method and vehicle system that control the position of a variable inlet guide vanes assembly to adjust compressor characteristics, specifically by determining and adjusting the inclination angle of the vanes to enhance compressor speed and efficiency, thereby improving transient response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a fuel optimized turbine size with high efficiency is used, then fuel efficiency is improved, but transient response time deteriorates
Solution Approach 1:
The patent applies a variable geometry turbocharger system with adjustable turbine vane positions that can dynamically change the turbine swallowing capacity. This allows the system to optimize for fuel efficiency at steady-state operating conditions while rapidly adjusting to improve transient response when load changes occur, resolving the contradiction between fuel efficiency and transient response time.
2Productivity
If a larger turbine and compressor diameter is used for optimal efficiency, then compressor efficiency is improved, but transient response deteriorates
Solution Approach 1:
The patent changes the geometric parameters of the turbocharger system by using variable turbine vane positions to adjust the effective turbine swallowing capacity. This allows optimal efficiency to be maintained at steady-state while enabling faster transient response through parameter adjustment, resolving the contradiction between compressor efficiency and transient response time.
3Device complexity
If a fix geometry turbocharger is used, then device complexity is reduced, but adaptability to different operating conditions deteriorates
Solution Approach 1:
The patent implements a variable geometry turbocharger system with adjustable turbine vane positions that can dynamically adapt to different operating conditions. This provides the adaptability needed for optimal transient response while maintaining a relatively simple overall structure, resolving the contradiction between device complexity and adaptability.
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 solution reduces transient response time by increasing compressor speed and efficiency, allowing for faster fuel injection and optimal torque delivery, while preventing speed overshoots, thus enhancing the overall performance and compliance with emission requirements.
Implementation Method 1
By controlling the pre-whirl it is possible to improve the efficiency of the compressor. The estimated positive inclination angle of the vanes may be between 0 and 45°, preferably between 0 and 20°.
Implementation Method 2
a turbocharger connected thereto... a compressor diameter for optimal efficiency... the compressor may reach a higher speed more rapid the transient behaviour is improved.
Data Source
AI summary
The invention relates to a method of controlling transient behaviour of an internal combustion engine (10) being provided with a turbocharger (110) and a variable inlet guide vanes assembly (130) arranged upstream a compressor (120) of the turbocharger (110). The method comprises determining a current operational condition indicative of transient behaviour, and, if said transient behaviour requires compressor acceleration: determining a desired operational condition of the compressor (120), and controlling the position of the variable inlet guide vanes assembly (130) based on the desired operational condition of the compressor (120).