Vehicle Deceleration Assist Mode Switching for Target Speed Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing deceleration assist control systems for vehicles struggle to easily control vehicle speed to a necessary speed, especially when encountering different types of deceleration targets and varying traveling situations, which can lead to difficulties in maintaining appropriate vehicle speed without excessive driver intervention.
Innovation Solution
A vehicle deceleration assist control device that includes an accelerator operation amount detection system, a deceleration target detection system, a deceleration system, and a control unit. The control unit performs deceleration assist control by calculating a target deceleration based on the type of deceleration target and making a mode change from an accelerator operation amount mode to a non-accelerator operation amount mode at a predetermined timing, allowing the vehicle to be decelerated based on the target deceleration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If deceleration assist control is provided according to accelerator operation amount when accelerator is on, then deceleration assist effect is improved by starting deceleration control early, but driver must control vehicle speed by controlling accelerator pedal depression amount which increases operation complexity
Solution Approach 1:
The system performs preliminary deceleration control based on accelerator operation amount when accelerator is on, starting deceleration early while the driver is still operating the accelerator. This preliminary action prepares the vehicle for upcoming deceleration needs without requiring the driver to release the accelerator prematurely, thus improving deceleration assist effect while maintaining ease of operation.
Solution Approach 2:
The system dynamically switches between two control modes: accelerator operation amount mode (when accelerator is on) and non-accelerator operation amount mode (when accelerator is off or at mode change timing). This dynamic adaptation allows the system to optimize between early deceleration initiation and simple speed control based on current driving conditions, resolving the contradiction between deceleration assist effect and operation ease.
2Loss of time
If deceleration control is based on accelerator operation amount, then deceleration can be initiated early, but it becomes difficult to control vehicle speed to necessary speed (such as 0 km/h for red signal) especially on uphill roads where gravity causes additional deceleration
Solution Approach 1:
The system initiates preliminary deceleration control based on accelerator operation amount to reduce response time, but then performs a mode change to non-accelerator operation amount mode at calculated timing. This timing is specifically designed to account for uphill road conditions and gravity-induced deceleration, allowing the system to achieve both early response and precise speed control by switching to a mode that uses pre-calculated target deceleration values.
Solution Approach 2:
The system changes the control parameter from accelerator operation amount to target deceleration at mode change timing. This parameter change allows the system to transition from a driver-input-based control mode to a system-controlled mode that can precisely achieve target vehicle speeds by compensating for gravitational effects on uphill roads and ensuring accurate speed control regardless of road gradient.
3Adaptability or versatility
If driver performs steering operation while reducing accelerator operation amount, then vehicle direction can be changed, but driver must simultaneously control vehicle speed through accelerator operation amount which increases operation complexity
Solution Approach 1:
The system performs preliminary deceleration control based on accelerator operation amount, anticipating the driver's need to slow down before or during steering operations. This preliminary action reduces the speed control burden on the driver during subsequent steering maneuvers, allowing the driver to focus on direction control without simultaneously managing complex speed adjustments.
Solution Approach 2:
The system dynamically switches to non-accelerator operation amount mode at appropriate timing, which automatically manages deceleration based on pre-calculated target deceleration. This dynamic mode change separates speed control from steering operation, allowing the driver to perform steering maneuvers without the added complexity of simultaneously controlling vehicle speed through the accelerator, thus improving combined maneuverability and operation ease.
Data Source
AI summary
A vehicle deceleration assist control device has a control unit for performing deceleration assist control in an accelerator operation amount mode for decelerating the vehicle according to the accelerator operation amount when the deceleration target is detected in a situation where the accelerator operation amount exceeds the reference value and the deceleration target is detected by controlling the deceleration device. The control unit calculates a target deceleration speed for making the vehicle speed of the vehicle when the vehicle reaches the position of the deceleration target to be a target vehicle speed determined by the type of the deceleration target, sets a mode change timing according to the type of the deceleration target, and when it is determined to be the mode change timing, a mode change from the accelerator operation amount mode to a non-accelerator operation amount mode is performed.