Vehicle Deceleration Control via Slip Detection Feedback
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Solution Overview
Problem
Existing vehicle control systems that prevent slipping are costly and require intentionally causing rear tires to slip, which is inefficient and expensive.
Innovation Solution
A vehicle control apparatus with a recognizer to identify surrounding situations, a controller for deceleration control, and a detector to suppress deceleration when slip is detected, adjusting the deceleration control variables based on slip conditions to prevent slipping without expensive configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If intentional rear tire slip is caused to obtain driving force transmission tolerance, then slipping prevention during vehicle start is achieved, but apparatus cost increases
Solution Approach 1:
The system uses feedback from wheel speed sensors to detect slip conditions in real-time. When slip is detected during deceleration control, the controller adjusts the controlled variable to suppress further slip, creating a closed-loop control system that prevents slipping without requiring intentional slip induction or complex additional hardware
Solution Approach 2:
The existing wheel speed sensors and control systems serve dual purposes: their primary function and slip detection. The system leverages normally available sensor data to detect slip conditions, eliminating the need for separate expensive slip detection configurations and making the existing apparatus self-sufficient for slip prevention
2Speed
If deceleration control is applied aggressively, then deceleration performance is improved, but vehicle slip occurs
Solution Approach 1:
The controlled variable for deceleration control is made dynamic and adaptive. Based on real-time slip detection, the controller automatically adjusts the deceleration profile - reducing the deceleration rate when slip is detected and maintaining aggressive deceleration when no slip occurs. This dynamic adjustment optimizes both deceleration performance and slip prevention
Solution Approach 2:
The system changes the controlled variable parameter based on slip conditions. When slip is detected during deceleration control, the controller modifies the controlled variable to suppress slip, effectively changing the deceleration profile from aggressive to conservative based on real-time vehicle state, thereby preventing slip while maintaining overall deceleration effectiveness
Data Source
AI summary
A vehicle control apparatus is provided with: a recognizer configured to recognize a surrounding situation of a host vehicle; a controller programmed to perform a deceleration control when a deceleration target is recognized by the recognizer; and a detector configured to detect a slip of the host vehicle. The controller sets a first controlled variable, which is a controlled variable associated with the deceleration control when the slip of the host vehicle is detected without execution of the deceleration control, so as to suppress an extent of deceleration of the host vehicle, in comparison with a second controlled variable, which is the controlled variable when the slip of the host vehicle is not detected without execution of the deceleration control.