Automatic Steering Resumption via Brake Urgency Detection
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Solution Overview
Problem
Conventional automatic steering systems face challenges in smoothly transitioning from automatic parking control to manual driving operations, particularly due to interference between brake application and steering forces, leading to complicated and troublesome resumption processes.
Innovation Solution
A vehicle steering system incorporating a manipulation urgency detector, automatic steering cancellation controller, control resumption data storage, and automatic steering resuming unit, which cancels automatic steering control when brake manipulation urgency exceeds a threshold and resumes it based on stored data without requiring driver intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If automatic parking control is cancelled by stopping brake manipulation, then the control should be cancelled, but the vehicle continues to move due to creeping force and may contact the obstacle
Solution Approach 1:
The system detects brake manipulation urgency in advance and proactively cancels automatic steering control before the driver needs to steer. By monitoring the brake pedal manipulation amount and rate of change, the system anticipates the driver's intent to avoid obstacles and pre-cancels the automatic steering, preventing interference between automatic steering torque and driver input while ensuring safety by eliminating creeping force before steering manipulation is needed
2Ease of operation
If automatic steering control is cancelled when brake is applied, then the interference between brake and steering forces is avoided, but the driver has to perform complicated resetting operations to resume parking control
Solution Approach 1:
The system automatically resumes automatic parking control without requiring driver intervention. After the driver releases the brake pedal (indicated by brake manipulation amount becoming zero), the system automatically restores the automatic steering control based on pre-stored target parking position data, eliminating the need for complicated resetting operations and reducing time loss
3Productivity
If automatic parking control maintains creeping force during brake application, then the vehicle can be stopped, but the steering forces interfere and prevent smooth subsequent driving operations
Solution Approach 1:
The system dynamically adjusts the automatic steering control state based on real-time brake manipulation detection. By continuously monitoring brake pedal manipulation amount and its rate of change, the system transitions from active automatic steering control to cancelled state when brake urgency exceeds threshold, and back to active state when brake is released, optimizing both parking efficiency and subsequent driving smoothness
Data Source
AI summary
A brake application speed is compared with a speed threshold value so as to judge whether or not a braking operation being performed is an emergency braking operation. If not the emergency braking operation, an automatic parking mode is held. When the emergency braking operation is in effect, control information related to a state of an automatic parking control then is stored in a control information storage section, and the automatic parking control is cancelled. Thereafter, when a steering operation or a gearshift operation is performed before a cancellation of application of the brake is detected, the process is ended, and the control mode is held in an assist mode. When the application of the brake is cancelled with neither the steering operation nor the gearshift operation performed, the control information is read in so as to resume the automatic parking control.