Vehicle Deceleration Control for Curved Road Outlet
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Solution Overview
Problem
Current deceleration control systems for vehicles on curved roads provide an unpleasant driving experience by maintaining the same deceleration control for both the inlet and outlet of a curve, leading to speed loss or insufficient acceleration feelings for the driver.
Innovation Solution
A deceleration control apparatus and method that differentiate deceleration control based on the vehicle's turning state, specifically reducing the controlled variable when exiting a curved road by using sensors and controllers to adjust throttle and brake controls according to yaw rate, lateral acceleration, and road friction, ensuring a smooth transition and preventing unpleasant feelings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same deceleration control is applied at both inlet and outlet of a curved road, then safety is improved by preventing spin and drift, but driving comfort deteriorates due to speed loss feeling and insufficient acceleration
Solution Approach 1:
The patent divides the curved road into two distinct segments: inlet and outlet. At the inlet, strong deceleration control is applied to prevent spin and drift. At the outlet, the control is switched to allow acceleration or reduce deceleration. This segmentation resolves the contradiction by applying different control strategies to different road sections.
Solution Approach 2:
The patent implements dynamic switching of the controlled variable based on the vehicle's position in the curve. The ECU detects whether the vehicle is at the inlet or outlet of a curved road and dynamically adjusts the deceleration control strategy. This dynamic adaptation allows the system to maintain safety at critical points while improving comfort when conditions permit.
2Stability of the object's composition
If deceleration control is strengthened to prevent spin and drift out, then vehicle stability is improved, but acceleration performance deteriorates at the outlet of curved road
Solution Approach 1:
The patent applies preliminary strong deceleration control at the inlet of the curved road to establish vehicle stability before the turn. Once stability is achieved and the vehicle reaches the outlet, the control is relaxed to allow acceleration. This preliminary action ensures stability is secured before transitioning to acceleration mode.
Solution Approach 2:
The patent implements periodic switching between deceleration and acceleration control modes based on the vehicle's position. Strong deceleration is applied periodically at the inlet, then the system transitions to acceleration mode at the outlet. This periodic action pattern resolves the contradiction by alternating between stability-focused and speed-focused control.
Data Source
AI summary
In deceleration control apparatus and method for an automotive vehicle, a deceleration control is performed on the basis of a turning of the vehicle; and a controlled variable of the deceleration control is decreased when the vehicle is traveling on an outlet of a curved road.