Active Sound Control Apparatus Battery State Adjustment
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Solution Overview
Problem
Existing sound control apparatuses in vehicles with internal combustion engines and electric motors often produce sound effects that are inconsistent with the vehicle's conditions or passenger intentions, particularly due to variations in battery residual quantity affecting the type and output of driving sources.
Innovation Solution
An active sound control apparatus that adjusts sound effect amplitude based on the state of charge of the storage battery, using a signal processing unit to set amplitude adjustment gains according to the battery's residual capacity, ensuring the sound effect matches the vehicle's condition and passenger intention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the reference signal is generated on the basis of the relatively high rotational frequency of the engine when the battery residual quantity is small, then the engine can maintain sufficient drive force, but the sound pressure level becomes higher than suitable for the actual degree of acceleration
Solution Approach 1:
The patent changes the parameter used for reference signal generation from engine rotational frequency to vehicle speed. This parameter substitution resolves the contradiction by decoupling the sound effect generation from the engine's operational state, allowing the sound pressure level to match the actual vehicle acceleration rather than the engine's high rotational frequency when charging the battery.
2Device complexity
If the sound effect is generated based on engine rotational frequency alone, then the sound control system is simple, but the sound effect becomes inconsistent with vehicle conditions and passenger intention
Solution Approach 1:
The patent makes the sound control system adaptive to multiple vehicle operating conditions by using vehicle speed as the universal reference parameter. This allows the system to function correctly whether the vehicle is being driven by the engine alone, electric motor alone, or both together, ensuring sound effect consistency with actual vehicle conditions and passenger expectations.
Data Source
AI summary
An ASC apparatus, which actively generates a sound effect inside a cabin of a vehicle provided with an internal combustion engine and an electric motor as driving sources, includes: a reference signal generating unit which generates a harmonic reference signal based on a vehicle-speed-corresponding frequency, being a frequency based on a vehicle speed, by referring to waveform data; a driver seat speaker which outputs a sound including the sound effect; and a signal processing unit which generates a control signal that forms the sound effect by multiplying the reference signal by a sound effect gain related to the reference signal, and outputs the control signal to the driver seat speaker. The signal processing unit sets the sound effect gain based on a state of charge of a storage battery.