Front-Rear Motor Torque Switching for Step-Induced Vibration Control
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Solution Overview
Problem
Existing driving force control methods do not effectively reduce vibrations experienced by vehicle occupants when passing over steps, focusing instead on improving traveling performance.
Innovation Solution
A driving force control method that adjusts the front wheel and rear wheel driving forces using a combination of regeneration and power running modes for the front and rear wheel motors, respectively, to minimize vibrations when traversing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving force control focuses on improving traveling performance by creating torque difference between front and rear wheels, then vehicle body lift and traveling performance are improved, but vibration applied to occupants increases
Solution Approach 1:
The control method applies periodic switching between first and second control modes before rear wheel ride-up timing. The first control mode creates vehicle body lift, while the second control mode reduces vibration. This periodic switching optimizes both traveling performance and ride comfort by timing the vibration reduction mode to occur just before the rear wheel contacts the step.
Solution Approach 2:
The control system dynamically switches between different control modes based on real-time vehicle state and step detection. The controller adjusts the driving force distribution between front and rear wheels dynamically, transitioning from a static torque difference approach to an adaptive control strategy that responds to changing vehicle conditions during step traversal.
2Force
If front wheel motor is regenerated and rear wheel motor is powered during step traversal, then vehicle body is lifted for improved traveling, but subsequent vibration occurs when rear wheel contacts the step
Solution Approach 1:
The control method applies preliminary anti-action by executing the second control mode (front wheel powered, rear wheel regenerated) before the rear wheel ride-up timing. This preliminary vibration reduction action counteracts the harmful vibration that would otherwise occur when the rear wheel contacts the step, while maintaining the beneficial vehicle body lift effect.
Solution Approach 2:
The controller performs preliminary action by switching to the second control mode in advance of the rear wheel contacting the step. This timing ensures that the vibration reduction mechanism is already active when the rear wheel approaches the step, preventing the transmission of vibration to the vehicle body and occupants.
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 method effectively reduces vibrations transmitted to the vehicle cabin by adjusting the driving force distribution to lift and lower the vehicle body rear portion at appropriate times, enhancing ride comfort for occupants.
Implementation Method 1
a front wheel motor connected to a front wheel of a vehicle and a rear wheel motor connected to a rear wheel
Implementation Method 2
a first control mode in which the front wheel motor is regenerated and the rear wheel motor is powered is executed
Data Source
AI summary
A step corresponding control of adjusting driving force of the front wheel motor and driving force of the rear wheel motor when the vehicle passes through a step is executed. In the step corresponding control, after a front wheel ride-up timing at which the front wheel rides up the step and before a rear wheel ride-up timing at which the rear wheel rides up the step, a first control mode in which the front wheel motor is regenerated and the rear wheel motor is powered is executed. In the step corresponding control, after the execution of the first control mode and before the rear wheel ride-up timing, a second control mode in which the front wheel motor is powered and the rear wheel motor is regenerated is executed.