Steer-By-Wire Motor Terminal Shorting to Prevent Wheel Kickback
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Solution Overview
Problem
Conventional vehicle steering devices with steer-by-wire systems face issues of unintentional steering wheel rotation when the vehicle is turned off, posing a risk of driver injury.
Innovation Solution
A vehicle steering device with a short-circuit controller that short-circuits or disconnects motor terminals based on the vehicle's on/off state, using a short-circuit control signal to prevent unintended steering wheel rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the steering input actuator and steering output actuator are mechanically separated in an electric steering device, then the system achieves independence and reduced mechanical coupling, but the steering wheel may be easily rotated when the vehicle is turned off, causing driver injury
Solution Approach 1:
The patent applies preliminary anti-action by detecting the vehicle's power state and proactively controlling the motor terminals before unintended rotation can occur. When the vehicle is turned off, the controller detects this state and immediately shorts the motor terminals or connects them to ground, creating a preliminary protective action that prevents the harmful effect of sudden steering wheel rotation before it can happen to the driver.
Solution Approach 2:
The controller acts as an intermediary between the motor and the steering wheel mechanism. By inserting this control element, the system can mediate the connection between electrical power and mechanical steering output, allowing it to disconnect or short-circuit the motor terminals when appropriate, thus preventing direct transmission of unintended rotation to the steering wheel while maintaining normal operation when powered on.
2Object-affected harmful factors
If the motor terminals are short-circuited when the vehicle is turned off, then sudden steering wheel rotation is prevented, but additional control circuitry and complexity are introduced
Solution Approach 1:
The controller performs multiple functions: it manages normal motor operation during vehicle operation, detects power state changes, and controls terminal short-circuiting for safety. By making the controller multi-functional rather than adding a completely separate safety device, the patent reduces overall system complexity while achieving the protective function.
Solution Approach 2:
The controller uses its own existing detection and control capabilities to manage the safety function. It self-detects the power state and self-regulates the terminal connections without requiring external monitoring systems or additional dedicated safety controllers, allowing the system to provide its own safety service.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Prevents sudden steering wheel rotation by generating a counter electromotive force when the vehicle is off, thereby safeguarding the driver from injury.
Implementation Method 1
Prevents sudden steering wheel rotation by generating a counter electromotive force when the vehicle is off
Data Source
AI summary
A vehicle steering device and a driving method thereof are capable of preventing sudden rotation of a steering wheel to prevent a driver's injury, the vehicle steering device including an inverter; a motor connected to the inverter through terminals; and a short-circuit controller configured to control a short-circuit state of the terminals of the motor based on whether a vehicle operated by the vehicle steering device is turned on.