Vehicle Travel Control Device for Target Acceleration
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Solution Overview
Problem
Existing vehicle control systems, such as ACC devices, struggle to achieve target acceleration/deceleration when drivers manually intervene, as the system prioritizes automatic or manual driving modes, leading to inconsistent vehicle control.
Innovation Solution
A travel control device that adjusts acceleration/deceleration characteristics by setting wider ranges for accelerator and brake operation amounts near target conditions, reducing sensitivity to driver inputs near target acceleration/deceleration, and increasing responsiveness further from these targets, allowing easier manual control of target vehicle states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the system prioritizes automatic driving mode, then automatic acceleration/deceleration control is achieved, but manual driver operations cannot easily achieve target acceleration/deceleration
Solution Approach 1:
The patent dynamically adjusts acceleration/deceleration characteristics based on whether the system is in automatic or manual mode. In automatic mode, the system maintains target acceleration/deceleration by adjusting the relationship between accelerator operation amount and actual acceleration. In manual mode, the system allows more direct transmission of driver input while still providing appropriate assistance, making the system adaptive to different operational contexts rather than fixed.
Solution Approach 2:
The patent changes key parameters including the accelerator operation amount-to-acceleration ratio, the responsiveness factor, and the assistance force magnitude depending on the operational mode. By adjusting these parameters dynamically, the system optimizes performance for both automatic and manual driving, resolving the contradiction between automation level and manual operability.
2Speed
If the system is highly responsive to driver inputs, then manual control responsiveness is improved, but stability near target acceleration/deceleration deteriorates
Solution Approach 1:
The patent applies different control characteristics to different operational regions. When the vehicle acceleration is near the target acceleration/deceleration, the system reduces responsiveness to driver inputs and increases assistance to maintain stability. When the vehicle is far from target, the system increases responsiveness to driver inputs. This local differentiation of control quality resolves the contradiction between overall responsiveness and local stability.
Solution Approach 2:
The system dynamically changes the responsiveness factor and assistance magnitude based on the deviation from target acceleration/deceleration. As the deviation decreases (approaching target), the responsiveness factor is reduced and assistance magnitude is increased to stabilize the system. As the deviation increases (moving away from target), the responsiveness factor is increased to improve responsiveness. This dynamic parameter adjustment resolves the contradiction between responsiveness and stability.
3Stability of the object's composition
If the system reduces sensitivity to driver inputs near target conditions, then acceleration stability is improved, but control flexibility deteriorates
Solution Approach 1:
The patent makes the control system dynamic by continuously adjusting the responsiveness factor and assistance magnitude based on real-time conditions. When near target acceleration/deceleration, the system reduces sensitivity to maintain stability. When far from target or when rapid changes are needed, the system increases sensitivity and flexibility. This dynamic adaptation allows the system to maintain both stability and flexibility across different operating conditions.
Solution Approach 2:
The system changes key parameters including the responsiveness factor, assistance magnitude, and accelerator operation amount-to-acceleration ratio based on the operational context. By adjusting these parameters dynamically, the system maintains stability near target conditions while preserving control flexibility when needed, resolving the contradiction between stability and adaptability.
Data Source
AI summary
Disclosed is a travel control device for easily achieving a target acceleration/deceleration even by a manual operation of a driver. A travel control device for controlling at least acceleration/deceleration of a vehicle includes acceleration/deceleration characteristic setting means for setting the range of an accelerator operation amount or a brake operation amount corresponding to an induced target acceleration/deceleration greater than the range of an accelerator operation amount or a brake operation amount corresponding to an acceleration/deceleration other than the induced target acceleration/deceleration. The acceleration/deceleration characteristic setting means generates a map GM1 in which the range of the accelerator operation amount or the brake operation amount corresponding to the acceleration/deceleration for achieving the induced target acceleration/deceleration is set greater than a basic map BM1, which defines the relationship between the accelerator operation amount and the acceleration/deceleration corresponding to the accelerator operation amount and the relationship between the brake operation amount and the acceleration/deceleration corresponding to the brake operation amount.