Steer-By-Wire Release Control for Pre-Activated Wheel Actuators
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Solution Overview
Problem
Existing steer-by-wire systems in vehicles do not ensure that the wheel-turning actuator is activated before the vehicle starts traveling, which can compromise the reliability of steering during travel.
Innovation Solution
A vehicle equipped with a steer-by-wire type steering device that includes a state switching device and a control device to ensure the wheel-turning actuator is activated only after the vehicle is released from a fixed state, with power supply states controlling the activation sequence to improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the wheel-turning actuator is activated after the vehicle starts traveling, then the vehicle can start faster, but the steering reliability deteriorates
Solution Approach 1:
The control device activates the wheel-turning actuator in advance before the vehicle starts traveling. The state switching device prevents the vehicle from starting until the wheel-turning actuator activation is confirmed complete, ensuring the actuator is ready before motion begins.
2Loss of time
If the state switching device allows vehicle release without confirming actuator activation, then the vehicle can start faster, but the steering safety deteriorates
Solution Approach 1:
The control device monitors the activation state of the wheel-turning actuator and uses this feedback to control the state switching device. The vehicle is only permitted to start when the feedback confirms the actuator is fully activated, creating a closed-loop safety mechanism.
3Reliability
If the control device checks power supply state and vehicle fixed state continuously, then the steering reliability is improved, but the device complexity increases
Solution Approach 1:
The control device performs multiple functions: it controls the wheel-turning actuator activation, manages the state switching device, monitors power supply state, and detects vehicle fixed state. By consolidating these functions in a single control device, the patent avoids the need for separate dedicated components for each function.
Data Source
AI summary
Provided is a vehicle equipped with a steer-by-wire type steering device and designed to ensure that a wheel-turning actuator is activated before the vehicle starts traveling, thereby improving the reliability of steering while the vehicle is traveling. A vehicle 1 includes: a steering member 15 for receiving steering operations; a wheel-turning actuator 19 mechanically separated from the steering member 15 and configured to turn wheels; a state switching device 6 for switching between a fixed state in which the vehicle is fixed at a current position and a release state in which the vehicle is released from being fixed at the current position; and a control device 9 for controlling the wheel-turning actuator 19 and the state switching device 6, wherein the control device permits the state switching device to switch from the fixed state to the release state only on or after completion of activation of the wheel-turning actuator.