Research on Shift Sound Quality Control Strategy for Active Sound Generation System in Automobile

The active sound synthesis system of electric vehicles plays an important role in improving the sound perception and transmission of working condition information inside the vehicle. Nowadays, the active sound synthesis system inside the vehicle has become standard equipment in electric vehicles of major electric vehicle manufacturers to meet the user groups' demand for driving and riding experience. In order to enrich the driving experience of electric vehicles and automatic transmission vehicles, the sound performance should be close to the immersiveness and dynamic feedback brought by traditional manual transmission fuel vehicles. Based on the active sound synthesis algorithm in the car, this paper proposes an adaptive shift sound quality control strategy suitable for complex and changeable working conditions, with the aim of simulating the real shift sound of the engine. First, the motor speed offset is accurately calculated based on the transmission ratio of each gear of the gearbox, and then fitted with the real-time motor speed to generate a highly simulated virtual speed for the sound synthesis algorithm. Secondly, linear interpolation is used to optimize the speed connection between complex and variable working conditions to ensure smooth transition of sound waves between multiple working conditions; Then, in order to improve the accuracy of system response, a constant compensation factor is introduced so that the virtual speed can sensitively follow the fluctuation of the actual motor speed, thereby achieving constant consistency of the gear shifting sound effect; Finally, the CAN signal of the actual vehicle driving condition is used as input to synthesize the shifting sound based on simulation. The conclusion shows that the shifting sound quality control strategy is suitable for multiple working conditions of electric vehicles, and can accurately and effectively simulate the acceleration sound of fuel vehicles with shifting, thus improving user experience and comfort.