Turbocharger Wastegate Control for Engine Sound Emission
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Solution Overview
Problem
Internal combustion engines face challenges in controlling turbocharger wastegates to effectively manage engine sound emission, as existing systems attenuate natural engine sounds when increasing torque output, leading to a compromise between sound and performance.
Innovation Solution
A turbocharger control system that generates a trigger signal to set a predetermined opening of the wastegate independently of the accelerator pedal position, maintaining or increasing the wastegate opening when the transmission is in park or neutral, allowing more natural engine sound to be emitted while preparing for increased airflow and torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wastegate opening is decreased to increase torque output, then the power output is improved, but the natural engine sound is attenuated
Solution Approach 1:
The wastegate control system dynamically adjusts the wastegate opening based on transmission state. When the transmission is in park or neutral, the system maintains a larger wastegate opening to preserve natural engine sound, while in driving gears it decreases the opening to maximize torque output. This dynamic adaptation allows the system to optimize both sound and performance according to operational context.
Solution Approach 2:
The system changes the wastegate opening parameter based on transmission state. In park/neutral conditions, the wastegate is maintained at a predetermined opening greater than zero percent to allow natural engine sound emission. During driving operations, the opening is adjusted based on accelerator pedal position to optimize torque. This parameter change strategy resolves the contradiction by applying different opening values for different operational states.
2Object-generated harmful factors
If the wastegate opening is increased to emit natural engine sound, then the sound emission is improved, but the torque output capability is reduced
Solution Approach 1:
The system dynamically adjusts wastegate opening based on transmission state and driver intent. When transmission is in park or neutral, the system maintains larger opening for sound emission. When in driving gears, it transitions to performance-oriented control based on accelerator pedal position. This dynamic behavior allows the system to prioritize sound or performance based on operational context.
Solution Approach 2:
The system prepares the wastegate in advance for different operational states. When the transmission is placed in park or neutral, the wastegate is proactively maintained at a predetermined opening to prepare for potential engine revving and sound emission. This preliminary positioning allows quick transition between sound and performance modes without compromising either capability.
Data Source
AI summary
A turbocharger control system of a vehicle includes a trigger module that generates a trigger signal when a transmission of the vehicle is in one of (i) park and (ii) neutral. A wastegate target module, in response to the generation of the trigger signal, sets a target opening of a turbocharger wastegate to a predetermined opening and independently of a position of an accelerator pedal. The predetermined opening is greater than zero percent opening of the turbocharger wastegate. A wastegate actuator module actuates the turbocharger wastegate based on the target opening of the turbocharger wastegate.