Four-Wheel Independent Steering Fallback Control for Wheel Malfunctions
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Solution Overview
Problem
Four-wheel independent steering systems malfunction, preventing vehicles from being controlled on a target path, as existing systems lack the ability to perform emergency steering control when the steering system fails.
Innovation Solution
An emergency steering control apparatus and method that includes a sensor module to detect malfunctions and a processor to control normal wheels opposite the malfunctioning wheels, adjusting vehicle speed and wheel angles to steer the vehicle in an intended direction, even when a wheel is malfunctioning, by turning off control power to the malfunctioning wheel and controlling the normal wheels to follow movement curves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If four-wheel independent steering system is implemented, then driving stability and turning performance are improved, but system complexity increases and vulnerability to malfunction increases
Solution Approach 1:
The steering system is divided into independent control units for each wheel, allowing individual wheel control. When a malfunction occurs, the system segments the control by disabling only the affected wheel while maintaining control over the other three wheels, thus preserving overall system functionality and stability.
Solution Approach 2:
The system dynamically changes operational parameters by adjusting the steering angles and speeds of individual wheels based on their functional status. When a wheel malfunctions, the control parameters for the remaining wheels are modified to compensate, maintaining driving stability despite the reduced configuration.
2Speed
If four-wheel independent steering system is implemented, then turning radius and driving performance are improved, but reliability decreases when malfunction occurs
Solution Approach 1:
The system预先 establishes emergency control strategies and backup control modes that are activated when a malfunction is detected. By having pre-programmed fallback procedures, the system maintains reliability during unexpected failures without compromising normal high-performance operation.
Solution Approach 2:
When a wheel malfunction occurs, the system converts this harmful event into a manageable situation by using the remaining functional wheels to compensate. The malfunctioning wheel's failure is offset by increased control authority and adjusted parameters on the operational wheels, transforming a reliability-critical event into a controlled operational change.
3Measurement precision
If malfunctioning wheel control is not turned off, then steering precision is maintained, but safety decreases due to uncontrolled wheel interference
Solution Approach 1:
The malfunctioning wheel is extracted from the active control loop by disabling its control signals. This isolation prevents the malfunctioning wheel from interfering with the steering control of the other wheels, eliminating the harmful factor while the system continues to operate with the remaining functional wheels.
Solution Approach 2:
The control system acts as an intermediary by introducing a malfunction detection and isolation layer between the steering commands and the individual wheels. This intermediary layer detects malfunctions and selectively disconnects the affected wheel, preventing harmful interference while maintaining overall steering functionality through the other wheels.
Data Source
AI summary
An emergency steering control apparatus of a four-wheel independent steering system includes a sensor module to detect a malfunction in a steering system of a vehicle provided with a wheel independent steering system and a processor to, when at least one leading wheel in a direction of movement of the vehicle malfunctions during forward movement or reverse movement of the vehicle, control normal wheels located opposite the at least one malfunctioning wheel in the direction of the movement so that the vehicle turns in an intended direction for emergency parking.