Accelerator Pedal Reaction Force Gating by Relative Speed
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Solution Overview
Problem
Existing vehicle control systems apply reaction forces to the accelerator pedal even when a driver wants to accelerate, hindering driving assistance by not distinguishing between situations where the relative speed with a preceding vehicle is less than a predetermined value.
Innovation Solution
A vehicle control device that limits the reaction force applied to the accelerator pedal when the relative speed with a preceding vehicle is less than a predetermined value, allowing for driving assistance without hindering the driver's intended acceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reaction force is applied to the accelerator pedal based on risk degree, then driving safety is improved, but driving operation is hindered when the driver intends to accelerate
Solution Approach 1:
The patent applies different reaction force control strategies based on the local condition of relative speed. When relative speed is below the threshold, no reaction force is applied to the accelerator pedal, allowing free driver operation. When relative speed is above the threshold, reaction force is applied proportionally to the risk degree, enhancing safety. This localized differentiation resolves the contradiction between safety and ease of operation.
Solution Approach 2:
The patent changes the parameter of reaction force magnitude based on the relative speed condition. By introducing a threshold value for relative speed, the system transitions between two states: zero reaction force when relative speed is low (preserving ease of operation) and proportional reaction force when relative speed is high (improving safety). This parameter-based control resolves the technical contradiction.
2Reliability
If reaction force is monotonically increased with risk degree, then collision prevention is improved, but unnecessary hindrance occurs when relative speed is low
Solution Approach 1:
The patent segments the risk management into two distinct scenarios based on relative speed threshold. Scenario 1: When relative speed is below threshold, no reaction force is applied regardless of other risk factors, eliminating unnecessary hindrance. Scenario 2: When relative speed is above threshold, traditional monotonic reaction force increase with risk degree is applied for collision prevention. This segmentation resolves the contradiction between collision prevention and eliminating unnecessary hindrance.
Solution Approach 2:
The patent introduces dynamic conditional logic where the reaction force behavior changes based on the relative speed parameter. The system dynamically switches between two modes: a permissive mode (no reaction force) when relative speed is low, and a restrictive mode (proportional reaction force) when relative speed is high. This dynamic adaptation resolves the contradiction by making the system responsive to the actual driving context.
Data Source
AI summary
There is provided a vehicle control device including a reaction force control section configured to acquire a relative speed obtained by subtracting a speed of a preceding vehicle from a speed of an own-vehicle, and, in a case in which the acquired relative speed is less than a predetermined value, limit a reaction force applied to an accelerator pedal of the own-vehicle by a reaction force application section.