Vehicle Controller Torque Distribution for Noise Suppression
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Solution Overview
Problem
Existing vehicle controllers face challenges in suppressing booming noise while maintaining the state of charge of the battery, as increasing motor-generator torque to reduce noise leads to excessive battery discharge.
Innovation Solution
A controller with a target engine torque and motor torque calculation unit, a permissible noise value calculator, and a threshold unit that adjusts engine and motor-generator torque based on the accelerator input and vehicle state to limit noise and conserve battery power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the torque of the motor-generator is increased to suppress booming noise, then the booming noise is reduced, but the state of charge of the battery is excessively reduced
Solution Approach 1:
The controller dynamically adjusts the torque distribution between the engine and motor-generator based on real-time operating conditions. By changing the torque parameters adaptively rather than maintaining fixed values, the system achieves noise suppression while optimizing battery power consumption and maintaining state of charge within acceptable ranges.
Solution Approach 2:
The control system continuously monitors vehicle operating conditions and dynamically modifies the torque allocation strategy. The controller transitions between different control modes based on real-time data, enabling flexible adjustment of motor-generator torque to balance noise reduction requirements with battery power conservation.
2Object-affected harmful factors
If the torque of the engine is reduced to suppress booming noise, then the booming noise is reduced, but the torque output required for vehicle propulsion must be compensated by the motor-generator
Solution Approach 1:
The system merges the torque output contributions of both the engine and motor-generator to achieve the required total torque for vehicle propulsion. By combining the reduced engine torque with increased motor-generator torque, the system maintains adequate power output while suppressing booming noise through optimized torque distribution.
Solution Approach 2:
The controller adjusts the torque parameters of both power sources dynamically. When engine torque is reduced to suppress noise, the motor-generator torque parameter is increased correspondingly to compensate for the power loss, ensuring that the total torque output remains sufficient for vehicle propulsion requirements.
Data Source
AI summary
A controller for a vehicle includes a controlling unit. In a case in which the target engine torque is less than or equal to a threshold, the controlling unit controls the engine such that the torque of the engine becomes equal to the target engine torque, and controls a motor-generator such that the torque of the motor-generator becomes equal to the target motor torque. Also, in a case in which the target engine torque is greater than the threshold, the controlling unit controls the engine such that the torque of the engine becomes less than or equal to the threshold, and controls the motor-generator such that the torque of the motor-generator increases.