Auxiliary Drive Torque Compensation for Low-Speed Jitter Suppression
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Solution Overview
Problem
The auxiliary drive system in four-wheel drive electric vehicles experiences periodic torsional vibration and tooth striking due to non-fitting gears during low-speed driving over bumps or potholes, leading to noise and reduced efficiency.
Innovation Solution
A method to determine and apply compensating torque based on vibration amplitude, using a combination of dynamic and constant torque, controlled through a system with modules for signal collection, filtering, judgment, and execution, to suppress vibrations without continuous torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the auxiliary drive system is kept in a low torque working state to prevent vibration, then vibration and noise are suppressed, but energy consumption increases and overall operating efficiency decreases
Solution Approach 1:
The patent applies periodic action by using pulse width modulation (PWM) to control the auxiliary drive system. The system alternates between working and non-working states in periodic pulses, where the duty cycle is adjusted based on vehicle speed and load conditions. This allows the system to achieve vibration suppression during critical periods while maintaining energy efficiency during non-critical periods, resolving the contradiction between continuous torque output and energy consumption.
Solution Approach 2:
The patent implements dynamics by making the auxiliary drive system's torque output adjustable and adaptive rather than fixed. The control system dynamically modifies the torque characteristics based on real-time vehicle operating conditions (speed, load, road conditions), enabling the system to optimize between vibration suppression and energy consumption for different driving scenarios.
2Stability of the object's composition
If the auxiliary drive system outputs torque continuously to keep gears fitted, then vibration is prevented, but energy consumption increases
Solution Approach 1:
The system uses periodic PWM control to maintain gear fitting stability only when necessary. By adjusting the duty cycle based on vehicle operating conditions, the system provides torque intermittently rather than continuously, maintaining gear engagement stability during critical periods while reducing energy consumption during stable operating periods.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the torque parameters (magnitude and timing) of the auxiliary drive system based on vehicle speed, load, and road conditions. This allows the system to maintain adequate gear fitting stability while optimizing energy consumption by applying torque only when and where needed.
3Use of energy by moving object
If the auxiliary drive system remains in non-working state to save energy, then energy efficiency is improved, but vibration and noise occur during low-speed driving over bumps
Solution Approach 1:
The system uses periodic PWM control to activate the auxiliary drive system only during specific periods when vibration is likely to occur (low-speed driving over bumps or potholes). The duty cycle is adjusted based on vehicle operating conditions, enabling the system to suppress vibration during critical periods while maintaining energy efficiency during normal operating periods.
Solution Approach 2:
The patent implements feedback control by continuously monitoring vehicle operating conditions (speed, load, road conditions) and adjusting the auxiliary drive system's torque output accordingly. This feedback mechanism enables the system to activate only when vibration conditions are detected, resolving the contradiction between energy efficiency and vibration suppression.
Data Source
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AI summary
The present invention provides a viberation suppression method, system, related device, and vehicle for an auxiliary driving system, wherein the viberation suppression method comprises the following steps: collecting motor speed signals of the auxiliary drive system; extracting vibration amplitude from the motor speed signals; judging whether the vibration amplitude exceeds a preset vibration amplitude threshold, and if so, proceeding to the next step; and calculating a compensating torque based on the vibration amplitude, and applying the compensating torque to a motor of the auxiliary drive system.