Vehicle Accelerator Pedal Force Control via Direction-Adaptive Thresholds
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Solution Overview
Problem
Existing drive control devices for vehicles do not effectively apply additional operation reaction forces to the accelerator pedal based on the vehicle's speed and direction, leading to potential contact with obstacles due to inappropriate timing and magnitude of the reaction force.
Innovation Solution
A drive control device that adjusts the lower limit and threshold for applying additional operation reaction forces to the accelerator pedal based on the vehicle's traveling direction, speed, and location, using electronic control units to calculate and apply forces dynamically, ensuring appropriate timing and magnitude of the reaction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional operation reaction force is applied to the accelerator pedal based on a fixed lower limit of depression speed, then the system can prevent contact with obstacles during forward travel, but it cannot effectively prevent contact during right/left turns or reverse travel where vehicle speed and depression speed characteristics differ
Solution Approach 1:
The patent applies the dynamics principle by making the lower limit of depression speed variable rather than fixed. The control unit dynamically adjusts the lower limit based on the vehicle's traveling direction (forward, backward, right turn, left turn) and current vehicle speed. This allows the system to adapt the reaction force application criteria to match the different speed characteristics of each traveling direction, resolving the contradiction between reliable obstacle prevention and adaptability to different driving scenarios.
2Adaptability or versatility
If the additional operation reaction force is applied at a low lower limit of depression speed, then it can prevent contact during reverse travel and turns, but it may cause unnecessary reaction force during forward travel where higher depression speeds are normal
Solution Approach 1:
The patent applies the local quality principle by setting different lower limit values for depression speed according to the specific traveling direction. Instead of using a single global threshold, the system establishes localized thresholds tailored to each direction (forward, backward, right turn, left turn). This ensures that the reaction force is applied appropriately for each local driving condition, preventing unnecessary interference during normal forward travel while providing adequate protection during turns and reverse travel.
3Reliability
If the additional operation reaction force is increased to ensure safety during turns and reverse travel, then contact prevention is improved, but the driver may perceive excessive force during normal forward travel
Solution Approach 1:
The patent applies the dynamics principle by dynamically adjusting both the lower limit of depression speed and the magnitude of the additional operation reaction force based on traveling direction and vehicle speed. During forward travel, the system uses higher lower limits and适度 reaction forces. During turns and reverse travel, it lowers the threshold and adjusts the force magnitude appropriately. This dynamic adaptation ensures reliable contact prevention while avoiding excessive force perception during normal driving conditions.
Data Source
AI summary
A drive control device for a vehicle includes an additional operation reaction force applying part that is configured to apply an additional operation reaction force to an accelerator pedal depending on the speed of depression of the accelerator pedal and the speed of the vehicle, and a lower limit changing part that is configured to change the lower limit of the speed of depression, above which the additional operation reaction force is applied, depending on the traveling direction of the vehicle. Therefore, the drive control device can apply an additional operation reaction force appropriately depending on the vehicle speed and the speed of depression of the accelerator pedal in each traveling direction.