Steered Wheel Torque Control for Banked Turn Stability
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Solution Overview
Problem
Front- and rear-wheel drive vehicles experience discomforting changes in steering direction and force when accelerating during turns due to the influence of driving force on the steered wheel, causing instability and discomfort for the driver.
Innovation Solution
A drive control system that adjusts the target driving torque of the steered wheel based on the accelerator operation, reducing its influence during banking to maintain stability and align with upright running conditions, thereby coordinating the driving forces between the front and rear wheels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If driving force is applied to the steered wheel during acceleration while banking, then acceleration performance is improved, but steering stability deteriorates due to changes in aligning torque
Solution Approach 1:
The control system preemptively adjusts the driving torque command to the steered wheel based on detected banking angle and acceleration state, before the steering instability occurs. By calculating the appropriate torque reduction in advance and applying it proactively, the system prevents the aligning torque fluctuation that would otherwise occur during acceleration on a banked turn.
Solution Approach 2:
The control system dynamically changes the driving torque parameter of the steered wheel based on vehicle banking angle and acceleration state. When banking is detected during acceleration, the system modifies the torque command to reduce the increase in driving force, thereby maintaining steering stability while still allowing acceleration to proceed.
2Power
If driving force increases during turning, then acceleration capability is enhanced, but steering force direction changes causing driver discomfort
Solution Approach 1:
The control system continuously monitors vehicle banking angle and acceleration state, using this feedback to dynamically adjust the driving torque command to the steered wheel. This closed-loop control ensures that when the vehicle is banking and accelerating, the system responds by reducing the torque increase, thereby maintaining consistent steering force direction and preventing driver discomfort.
Solution Approach 2:
The system preemptively adjusts the driving torque command based on detected banking angle and acceleration state, before the steering force direction change occurs. By calculating and applying the torque reduction in advance, the system prevents the harmful steering moment from developing, maintaining smooth steering handling throughout the acceleration maneuver.
Data Source
AI summary
A drive control system for a front- and rear-wheel drive vehicle is provided. The drive control system is installed on the front- and rear-wheel drive vehicle, which is a two-wheeler equipped with a front wheel and a rear wheel both serving as driving wheels, one of which is a steered wheel. When the vehicle is banking, the drive control system performs control of decreasing target driving torque of the steered wheel according to an amount of accelerator operation during acceleration operation of a driver compared to when the vehicle is running upright.