Steering Reaction Torque Control for Parked Vehicle Battery Limits
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Solution Overview
Problem
Steer-by-wire systems in vehicles lack a mechanism to provide a reaction force to the steering wheel when the vehicle is parked, leading to potential unintended movement and battery discharge issues due to inefficient power management during low current conditions.
Innovation Solution
A steering control device and method that includes a condition determiner, producer, and controller to assess and generate a reaction torque based on vehicle stop conditions and remaining battery power, adjusting the reaction force to optimize power usage and prevent battery discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reaction force is provided to the steering wheel when the vehicle is parked, then the reliability of preventing unintended movement is improved, but the battery may be discharged due to continuous power consumption
Solution Approach 1:
The reaction force providing system dynamically adjusts its operation based on detected conditions. When a driver approach is detected via sensor, the system activates to provide reaction force. When no driver is present or the vehicle is in neutral gear, the system deactivates to conserve battery power, making the power consumption adaptive rather than continuous
Solution Approach 2:
The system changes its operational parameters based on detected conditions. The reaction force magnitude and activation state are adjusted according to whether a driver is present, the gear position, and other contextual factors, allowing the system to provide necessary safety functionality while optimizing power consumption
2Stability of the object's composition
If a general scheme for providing reaction force is used when the vehicle system is off, then the steering wheel stability is improved, but the battery discharge problem occurs
Solution Approach 1:
The system takes preliminary action by detecting driver approach and vehicle conditions before activating the reaction force provision. This prevents unnecessary activation and subsequent battery discharge while ensuring the steering wheel remains stable when actually needed
Solution Approach 2:
The system uses sensor feedback to continuously monitor driver presence, gear position, and other conditions. Based on this feedback, the control unit intelligently decides whether to activate the reaction force providing mechanism, creating a closed-loop system that balances stability requirements with power conservation
3Reliability
If the reaction force motor is activated to provide stop reaction torque, then the steering wheel becomes fixed and safe, but the current consumption increases when battery current is low
Solution Approach 1:
The system performs preliminary detection of driver approach and vehicle conditions before activating the reaction force motor. This ensures the motor is only activated when necessary and safe to do so, preventing current consumption issues while maintaining safety
Solution Approach 2:
The system uses the vehicle's existing sensor network and control infrastructure to detect conditions and manage reaction force provision autonomously, optimizing current usage based on real-time vehicle state without requiring additional dedicated power supply 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
Enables the provision of a reaction force to the steering wheel in parked vehicles while conserving battery power, reducing the risk of unintended vehicle movement and extending battery life by dynamically adjusting the reaction torque based on available power.
Implementation Method 1
controlling a reaction force motor to generate a reaction torque in response to rotation of a steering wheel
Data Source
AI summary
The disclosure relates to a steering control device and method and includes a steering control device controlling a reaction force motor to generate a reaction torque in response to rotation of a steering wheel and comprising a condition determiner determining whether a stop reaction force providing condition is met, the stop reaction force providing condition including a preset vehicle stop condition and reaction force provision preparation condition, a producer discerning and processing a scheme for producing stop reaction torque information based on remaining power information regarding a remaining power amount of a battery supplying power to the reaction force motor upon determining that the stop reaction force providing condition is met, and a controller controlling to generate a reaction torque to the steering wheel based on the stop reaction torque information.