Vehicle Motor Controller Speed Threshold Noise Suppression
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Solution Overview
Problem
Current vehicle control systems experience noise generation in power supply cables due to current variations, leading to potential vibration and reduced vehicle quality.
Innovation Solution
A vehicle control apparatus incorporating an electric motor, an electricity storage device, and a motor controller that couples the electric motor to the engine, with a bypass condenser and a control system that executes an assistance mode only when the electric motor's rotation speed is below a threshold, and prohibits it when above, to manage current variations and suppress noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the assistance mode is executed to transmit motor power to the engine, then the vehicle acceleration performance is improved, but noise and vibration are generated in the power supply cable
Solution Approach 1:
The control system dynamically adjusts the assistance mode execution based on real-time monitoring of motor rotation speed. When the motor speed exceeds the predetermined threshold during assistance mode, the control unit automatically terminates the assistance mode, thereby dynamically adapting the power transmission to suppress noise and vibration while maintaining acceleration performance when conditions are favorable
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors the rotation speed of the electric motor and uses this information to control the execution of the assistance mode. The feedback loop compares the actual motor speed against the predetermined threshold and adjusts the assistance mode accordingly, enabling the system to respond to changing operating conditions and suppress harmful noise and vibration
2Object-generated harmful factors
If the rotation speed threshold is set low to suppress noise, then noise and vibration are reduced, but the assistance mode cannot be executed at higher speeds
Solution Approach 1:
The system changes the operational parameter (assistance mode execution status) based on the motor rotation speed parameter. By establishing a predetermined threshold for motor speed, the system automatically transitions between different operational states: enabling assistance mode when speed is below the threshold and disabling it when speed exceeds the threshold, thereby adapting the system behavior to different operating conditions
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise levels in the power supply cable, enhancing vehicle quality by minimizing vibrations and noise transmission within the cabin.
Implementation Method 1
a bypass condenser coupled in parallel to the starter generator
Data Source
AI summary
A vehicle control apparatus to be mounted on a vehicle including an engine includes an electric motor, an electricity storage device, and a motor controller. The electric motor is coupled to the engine and generates motor power. The electricity storage device is coupled to the electric motor through a power supply cable. The motor controller causes execution of an assistance mode. The assistance mode includes controlling the electric motor to a powering state to transmit the motor power to the engine in operation. The motor controller permits the execution of the assistance mode on the condition that a rotation speed of the electric motor is lower than a threshold. The motor controller prohibits the execution of the assistance mode on the condition that the rotation speed of the electric motor is higher than the threshold.