Vehicle Turn Control via Accelerator Rate
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Solution Overview
Problem
Existing vehicle control systems fail to effectively improve attitude control and operability performance during turns, particularly in low-speed scenarios, as they do not adequately account for the rate of change in accelerator pedal opening, leading to instability and reduced responsiveness.
Innovation Solution
A vehicle system that adjusts the power difference between left and right drive wheels based on the time differential of the requested amount of drive power and turn, using prime movers connected to each wheel to control torque distribution, allowing for flexible power adjustments without limiting both wheels to forward direction, enhancing stability and responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the driving force is applied to the outer wheel upon turning and then to the inner wheel during the turn, then vehicle stability is improved, but the responsiveness to driver acceleration requests during turns remains insufficient
Solution Approach 1:
The control system calculates a target outer wheel driving force in advance based on the rate of change of accelerator pedal opening (dAcc/dt) before the actual acceleration request is fully executed. This preliminary calculation allows the outer wheel to receive the appropriate driving force immediately when needed, improving responsiveness while maintaining stability through the coordinated inner wheel force application.
Solution Approach 2:
The patent dynamically adjusts the driving force distribution between left and right wheels based on the real-time rate of change of accelerator pedal opening (dAcc/dt). By making the driving force control variable and responsive to driver input dynamics rather than fixed, the system achieves both stability during turns and improved responsiveness to acceleration requests.
2Device complexity
If the driving force control is based only on accelerator pedal opening position, then the control system is simple, but the attitude control performance during turns is insufficient
Solution Approach 1:
The patent introduces a new control parameter - the rate of change of accelerator pedal opening (dAcc/dt) - in addition to the accelerator pedal opening position. This parameter change enables the control system to detect driver acceleration intentions more accurately and adjust driving force distribution accordingly, significantly improving attitude control performance during turns while adding only one calculation step to the existing simple control architecture.
Data Source
AI summary
Provided is a vehicle that can improve vehicle posture control or operation performance during accelerating turn. A vehicle is provided with: a left drive wheel and a right drive wheel connected to a motor; a required drive power amount input device for inputting a required drive power amount; and a required turn amount input device for inputting a required turn amount. The vehicle further includes a turn control device that adjusts a power difference between the left drive wheel and the right drive wheel on the basis of a time derivative value of the required drive power amount in addition to the required turn amount.