Turbocharged Engine Antisurge Control via Electronic Actuation
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Solution Overview
Problem
Turbocharged gasoline engines face compressor surge issues when the throttle is closed, leading to potential engine damage and noise, which existing solutions like recirculation valves attempt to mitigate but add complexity and cost without improving power or efficiency.
Innovation Solution
A software module within the engine control unit is used to control engine parameters, eliminating the need for a recirculation valve by implementing an antisurge control module that detects surge conditions and adjusts engine actuators to prevent surge, thereby reducing complexity and cost while maintaining turbocharger performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a recirculation valve is used to prevent compressor surge, then engine reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical recirculation valve system with an electronic control system. The engine control unit monitors throttle position and turbocharger speed, and electronically controls fuel injection and ignition timing to prevent compressor surge. This substitution eliminates the need for additional mechanical valves and associated plumbing, reducing device complexity while maintaining surge prevention capability.
Solution Approach 2:
The engine control system uses the engine's own operating parameters (throttle position, turbocharger speed, fuel injection, ignition timing) to prevent surge conditions. The system self-regulates by adjusting combustion parameters based on real-time sensor data, eliminating the need for external recirculation valve mechanisms.
2Reliability
If a recirculation valve is used to prevent compressor surge, then engine reliability is improved, but manufacturing cost increases
Solution Approach 1:
By replacing the mechanical recirculation valve with an electronic control system, the patent eliminates the need for manufacturing additional valve components, housings, and associated plumbing. The electronic control unit and sensors are standard components in modern engines, reducing overall manufacturing cost while maintaining surge prevention functionality.
3Reliability
If a recirculation valve is used to prevent compressor surge, then compressor surge is prevented, but engine power and efficiency are not improved
Solution Approach 1:
The electronic control system not only prevents surge but also optimizes engine power and efficiency by dynamically adjusting fuel injection timing and ignition timing based on real-time operating conditions. The system uses the same sensor inputs to both prevent surge and maximize engine performance, eliminating the trade-off between surge prevention and power output.
Solution Approach 2:
The engine control unit performs multiple functions: it prevents compressor surge by monitoring throttle position and turbocharger speed, while simultaneously optimizing fuel injection and ignition timing for maximum power and efficiency. This multi-functional approach eliminates the need for dedicated surge prevention hardware that would not contribute to power or efficiency.
Data Source
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AI summary
An apparatus for providing an antisurge operating mode for a turbocharged engine may include a processor. The processor may be configured to receive indications of engine operating parameters and engine accelerator pedal position, determine whether the received indications correspond to antisurge mode activation conditions, and, in response to a determination that the received indications correspond to antisurge mode activation conditions, initiate control of selected engine components by directing the selected engine components to operate based on stored engine operating parameters recorded a predetermined time prior to the determination.