Steer-By-Wire Power Supply Boosting for Parking Wheel Angle
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Solution Overview
Problem
Current power supply systems for steer-by-wire steering devices face challenges in providing sufficient wheel rotation angles during parking operations due to capacity limits, leading to inadequate steering control.
Innovation Solution
A power supply system with a high-voltage power source, converter, low-voltage power source, main and sub uninterruptible power supplies, and switch elements to control and boost operating voltage, ensuring stable steering operations even in failure scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the current 12V power supply system is used, then the system structure is simple, but the wheel rotation angle is insufficient during parking operations due to capacity limits
Solution Approach 1:
The patent applies parameter changes by switching the power supply voltage from 12V to 24V during parking operations. The controller detects the parking state and activates the 24V power supply mode, which provides sufficient power capacity to achieve the required wheel rotation angle. This parameter change resolves the contradiction by maintaining simple system structure while enabling high productivity when needed.
2Speed
If voltage is boosted during parking operations, then fast rack speed and wheel rotation are improved, but power supply complexity increases
Solution Approach 1:
The patent merges the 12V and 24V power supply systems into a unified structure with a single converter that can operate in both voltage modes. The DC-DC converter is designed to handle both 12V input (providing 24V output) and 24V input (direct output), eliminating the need for separate power supply circuits. This merging approach enables fast rack speed during parking while keeping the overall system structure relatively simple.
Solution Approach 2:
The converter is designed with multi-functionality to serve dual purposes: it operates as a 12V-to-24V DC-DC converter during normal driving and as a 24V power distributor during parking operations. This universal design allows the same component to provide both standard operation and boosted performance, reducing the need for additional specialized equipment.
3Device complexity
If a single power supply is used, then the system is simple, but reliability is reduced during failure scenarios
Solution Approach 1:
The patent implements preliminary action by pre-configuring dual power supply sources (12V and 24V) and their associated converters before any failure occurs. The system is designed with redundant power paths that can be activated immediately upon detecting a failure in the primary power supply, ensuring continuous operation without interruption to steering functionality.
Solution Approach 2:
The patent applies beforehand cushioning by creating a redundant power supply architecture where the secondary power source (24V with higher capacity) serves as a backup cushion against primary power supply failures. This prior cushioning ensures that if the 12V system fails, the 24V system can immediately take over, maintaining steering operation reliability without requiring complex real-time switching mechanisms.
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 system provides enhanced steering control by boosting voltage during parking and maintaining stability through redundant power supply systems, ensuring reliable steering even in failure conditions.
Implementation Method 1
a converter configured to convert voltage of the high-voltage power source into an operating voltage
Implementation Method 2
the main uninterruptible power supply includes a first charging circuit, a first capacitor, and one or more switch elements
Implementation Method 3
one or more switch elements including a first switch element connected to the first charging circuit
Data Source
AI summary
A power supply system for supplying power to a steer-by-wire steering device includes a high-voltage power source, a converter for converting voltage of the high-voltage power source into an operating voltage, a low-voltage power source, a steer-by-wire steering device including a main system and a sub system, and an uninterruptible power supply for receiving power from the low-voltage power source and supplying the power to a sub system, in which the uninterruptible power supply includes a first charging circuit, a first capacitor, and one or more switch elements, and turns on a first switch element connected to the first charging circuit to apply a boosted operating voltage to the main system in a case where a vehicle is in a parking operation.