Vehicle Torque Reduction Control for Accelerator Return Response
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Solution Overview
Problem
Existing vehicle control systems fail to differentiate between scenes where responsiveness or controllability is prioritized, leading to deterioration in either responsiveness or controllability when setting a uniform reduction rate for driving torque during accelerator returning operations.
Innovation Solution
A control device that adjusts the reduction rate of driving torque based on the change in accelerator operation amount, setting a higher rate for greater changes to prioritize responsiveness and a lower rate for smaller changes to prioritize controllability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a uniform reduction rate of driving torque is set during accelerator returning operation, then the control system is simple to implement, but responsiveness deteriorates when rapid torque reduction is needed
Solution Approach 1:
The patent applies dynamics by making the torque reduction rate variable rather than uniform. The control device dynamically adjusts the reduction rate based on the change amount of accelerator operation amount, allowing the system to adapt its behavior to different driving situations. This resolves the contradiction by enabling rapid torque reduction when needed while maintaining operational simplicity through automated dynamic adjustment.
Solution Approach 2:
The patent changes the parameter of torque reduction rate from a fixed uniform value to a variable value that depends on the accelerator operation amount change. By introducing this parameter change based on accelerator operation characteristics, the system achieves both responsiveness (when large change amount occurs) and controllability (when small change amount occurs) without complicating the overall control logic.
2Speed
If a high reduction rate of driving torque is set to prioritize responsiveness, then torque is quickly reduced, but controllability deteriorates
Solution Approach 1:
The patent resolves this contradiction by changing the torque reduction rate parameter based on the accelerator operation amount change. When the change amount is large, a high reduction rate is applied for responsiveness. When the change amount is small, a low reduction rate is applied for controllability. This dynamic parameter adjustment allows the system to achieve both responsiveness and controllability in different operating conditions.
Solution Approach 2:
The patent applies local quality by differentiating the torque reduction behavior based on the local condition of accelerator operation change amount. Different reduction rates are applied to different local situations (large change vs. small change), allowing optimal performance for each specific operating condition rather than using a single uniform approach.
3Stability of the object's composition
If a low reduction rate of driving torque is set to prioritize controllability, then torque is gradually reduced, but responsiveness deteriorates
Solution Approach 1:
The patent resolves this contradiction by dynamically changing the torque reduction rate parameter based on accelerator operation characteristics. When rapid response is needed (large accelerator change), the reduction rate increases. When gradual control is needed (small accelerator change), the reduction rate decreases. This parameter adaptation eliminates the need to choose between responsiveness and controllability.
Solution Approach 2:
The patent applies dynamics by making the torque reduction rate adaptive rather than static. The system dynamically responds to accelerator operation changes, adjusting the reduction rate in real-time to match the driver's intent. This dynamic behavior allows the system to provide both rapid response and gradual control as needed.
Data Source
AI summary
The larger the amount of change in the accelerator operation amount from the point in time when the accelerator returning operation is performed to the current point in time, the larger the reduction rate of the driving torque at the time of decreasing toward the required value of the driving torque is set. When the amount of change in the accelerator operation amount is relatively great, the reduction rate of the driving torque is set to a relatively great value in accordance with the scene in which prioritizing responsiveness is likely to be desired, such that the driving torque is quickly reduced. When the amount of change in the accelerator operation amount is relatively small, the reduction rate of the driving torque is set to a relatively small value in accordance with the scene in which prioritizing controllability is likely to be desired, so the driving torque is gradually reduced.