ESCL Cam Wheel Position Detection Using Hall Sensor
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Solution Overview
Problem
Existing electrical steering column locks (ESCLs) lack precise control over the bolt position, leading to potential failure to secure the steering column or damage to the lock due to inadequate positioning, which is not effectively compensated for by environmental influences like supply voltage, temperature, and aging.
Innovation Solution
An ESCL design featuring a cam wheel, gear, and motor assembly with parallel axes on the same plane, utilizing a Hall effect position sensor and magnet to determine the cam wheel's rotation position, allowing for precise speed calculation and adjustment of braking timing, thereby compensating for environmental factors and ensuring reliable locking and unlocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the bolt position is not precisely controlled, then the ESCL structure is simpler, but the steering column may fail to lock securely or the lock may be damaged
Solution Approach 1:
The patent replaces complex mechanical position sensing mechanisms with a Hall effect sensor-based detection system. The Hall sensor detects the position of a magnet attached to the cam wheel, providing electronic feedback about bolt position without requiring complex mechanical linkages or contact-based sensors, thus achieving reliable position control with reduced mechanical complexity
Solution Approach 2:
The patent implements a feedback mechanism where the Hall effect sensor continuously monitors the cam wheel position and provides signals to the control unit. This feedback loop enables the control system to adjust motor operation to achieve precise bolt positioning, ensuring reliable locking while maintaining controlled system complexity through intelligent control
2Measurement precision
If environmental influences like supply voltage, temperature and ageing are not compensated, then the system is simpler, but the locking precision deteriorates
Solution Approach 1:
The Hall effect sensor provides continuous feedback on cam wheel position, enabling the control unit to detect and compensate for position deviations caused by environmental factors. The feedback signal allows real-time adjustment of motor control parameters to maintain accurate bolt positioning despite variations in supply voltage, temperature, or component ageing
Solution Approach 2:
The control unit dynamically adjusts operating parameters such as motor drive pulse width modulation (PWM) duty cycle and braking timing based on Hall sensor feedback. By changing these parameters in response to detected position variations, the system compensates for environmental influences and maintains precise locking without requiring complex hardware compensation circuits
3Reliability
If the bolt is driven too far without position monitoring, then the system is simpler, but damage to the electrical lock occurs
Solution Approach 1:
The Hall effect sensor provides continuous position feedback that enables the control unit to monitor bolt movement in real-time. When the bolt reaches its predetermined retraction position or locking position, the Hall sensor detects the corresponding cam wheel angle and signals the control unit to stop motor operation or apply braking, preventing over-travel and damage to the lock mechanism
Solution Approach 2:
The control unit is programmed with predetermined stopping positions for the bolt based on cam wheel angle feedback from the Hall sensor. Before damage can occur, the system proactively stops motor operation or applies electromagnetic braking when the bolt approaches critical positions, preventing over-driving and ensuring lock durability through advance intervention
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 enables precise angular movement detection, avoiding motor overload and damage, providing improved diagnostics and ensuring correct position detection even after voltage interruptions, thus enhancing the safety and reliability of the ESCL.
Implementation Method 1
utilizing a Hall effect position sensor and magnet to determine the cam wheel's rotation position
Data Source
AI summary
An electrical steering column lock for an automotive vehicle capable of locking and unlocking the steering column is disclosed. The electrical steering column lock includes a bolt intended to move for locking and for unlocking the steering column, a cam wheel intended to rotate according a first rotation axis and to cooperate with the bolt for controlling the bolt movement, and an assembly for determining the rotational position of the cam wheel while the cam wheel is rotating.