Steer-By-Wire Backup Charging Lockout Before Vehicle Release
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Solution Overview
Problem
Existing steering control devices for vehicles do not ensure a sufficient remaining charge amount in the backup power supply at the start of traveling, which can lead to inadequate functioning of the steer-by-wire system in emergency situations.
Innovation Solution
A steering control device that includes a vehicle fixing control unit, which fixes the vehicle during the charging of the backup power supply and prevents vehicle fixing termination until the backup power supply reaches a preset fail-safe executable remaining charge amount determination value, ensuring sufficient stored electric power to operate the steer-by-wire system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the backup power supply is charged immediately when the vehicle is powered on, then the charging time is shortened, but the remaining charge amount may be insufficient for emergency operation
Solution Approach 1:
The vehicle fixing control unit performs preliminary action by fixing the vehicle during the charging period. This prevents the vehicle from being operable until the backup power supply has accumulated sufficient charge, thereby ensuring that when charging is complete, the remaining charge amount is adequate for emergency steer-by-wire operation.
2Ease of operation
If the vehicle fixing is terminated early to allow vehicle operation, then the ease of operation is improved, but the steer-by-wire system may not function properly in emergency situations
Solution Approach 1:
The system applies beforehand cushioning by maintaining the fixed state during charging. This ensures that sufficient energy is stored in the backup power supply before the vehicle becomes operable, creating a safety cushion that guarantees the steer-by-wire system will function even if main power fails during operation.
3Reliability
If the backup power supply capacity is increased to ensure sufficient remaining charge, then the reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The system uses dynamic control of the vehicle fixing state based on the charging status of the backup power supply. The fixing control unit dynamically adjusts when to terminate fixing based on whether sufficient charge has been accumulated, allowing the use of a smaller backup power supply while still ensuring adequate emergency operation capability.
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
The solution ensures that the steer-by-wire system has a sufficient charge at the start of traveling, allowing it to function properly even in emergency situations where the main power supply fails.
Implementation Method 1
a backup power supply configured to back up the main power supply starts to be charged when the vehicle is powered on
Data Source
AI summary
The vehicle fixing control unit fixes the vehicle during the charging of the backup power supply, and the vehicle fixing by the vehicle fixing device is not released regardless of the vehicle fixing release request by the operation of the vehicle fixing device operation switch until the remaining charge amount of the backup power supply reaches the fail-safe executable remaining charge amount determination value set in advance. Thus, when the vehicle travels with the vehicle fixing released, since at least the remaining charge amount is stored up to the remaining charge amount determination value that can be performed in a fail-safe manner enough to operate the steer-by-wire system at the time of starting the vehicle traveling, it is possible to sufficiently function the vehicle steering control device even in an emergency.