Driving Force Control Device for Smooth Mode Transition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driving force control systems experience abrupt changes in driving force when switching between automated and manual driving modes, leading to discomfort for drivers.
Innovation Solution
A driving force control device that switches between manual and automated driving modes by adjusting the driving force characteristic based on vehicle speed, accelerator pedal position, and traveling resistance, using an override driving force characteristic that prioritizes driver intention and smooth transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving force is controlled based on the manual-driving-mode driving force characteristic when switching from automated to manual driving mode, then the driver's intended acceleration response is improved, but an abrupt change in driving force occurs causing driver discomfort
Solution Approach 1:
The system performs preliminary action by switching to the override driving force characteristic before the manual-driving-mode characteristic is fully applied. This intermediate characteristic gradually transitions the driving force, preventing abrupt changes while still responding to driver input. The override characteristic acts as a buffer that prepares the system for the transition, eliminating the harmful abrupt change effect.
Solution Approach 2:
The override driving force characteristic serves as an intermediary between the automated driving mode and the manual driving mode. It mediates the transition by providing an intermediate driving force level that is higher than automated mode but lower than full manual mode, smoothing the transition and preventing driver discomfort caused by abrupt changes.
2Speed
If the longitudinal acceleration at fully closed accelerator pedal position in override driving force characteristic is made higher than in manual-driving-mode characteristic, then the vehicle responsiveness to driver input is improved, but the risk of unintended acceleration increases
Solution Approach 1:
The system dynamically adjusts the accelerator pedal characteristic curve based on the current driving mode. During the transition from automated to manual mode, the override characteristic provides higher acceleration response temporarily, but the system continuously monitors pedal position and transitions to the standard manual characteristic when the transition is complete, thereby maintaining safety while improving responsiveness during the critical transition phase.
Solution Approach 2:
The override driving force characteristic is applied periodically or temporarily only during the mode transition phase, not continuously. The system switches to this enhanced characteristic when detecting mode transition, maintains it for the duration of the transition, then reverts to the standard manual characteristic, providing enhanced responsiveness only when needed while maintaining safety during normal manual operation.
Data Source
AI summary
A driving force control device in which, when an automated driving mode is shifted to a manual driving mode, a driving force is controlled based on an override driving force characteristic specifying target acceleration according to a vehicle speed, a accelerator pedal position, and a traveling resistance to the vehicle, a longitudinal acceleration at a fully closed accelerator pedal position in the override driving force characteristic is higher than the longitudinal acceleration at the fully closed accelerator pedal position in the manual-driving-mode driving force characteristic, and an inclination of a graph representing a relationship between the accelerator pedal position and the longitudinal acceleration in the override driving force characteristic is smaller than the inclination of the graph representing the relationship between the accelerator pedal position and the longitudinal acceleration in the manual-driving-mode driving force characteristic at a same accelerator pedal position.