Electromagnetic Differential Locking Mechanism for Torque Control
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Solution Overview
Problem
Existing vehicle differential systems fail to effectively manage differing wheel speeds, particularly under conditions where one wheel experiences a surface with a lower coefficient of friction, leading to undesired vehicle performance due to inadequate torque application.
Innovation Solution
A system with an electrically controlled differential locking mechanism using a coil, drive member, and lock member that can selectively lock and unlock the differential, utilizing a processor to determine the position of the locking mechanism through current profiles, allowing for precise control of wheel speed synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a differential is provided to allow different wheel turning rates, then the vehicle can accommodate turning and non-uniform road conditions, but torque cannot be effectively applied to wheels with more traction when one wheel experiences a surface with lower friction coefficient
Solution Approach 1:
The differential locking mechanism dynamically transitions between locked and unlocked states based on driving conditions. The solenoid actuator enables the lock member to engage or disengage from the gear, allowing the system to adapt between differential operation (for turning) and locked differential operation (for traction), resolving the contradiction between adaptability and torque application reliability
Solution Approach 2:
The system changes the mechanical constraint parameter of the differential by engaging or disengaging the lock member. When locked, the differential allows no speed difference between wheels; when unlocked, it permits speed differences. This parameter change enables the system to maintain torque application reliability while preserving adaptability for different driving conditions
2Reliability
If a locking mechanism is provided to lock the differential, then torque can be applied to wheels with more traction, but the device complexity increases with additional components
Solution Approach 1:
The solenoid actuator and lock member are integrated into the existing differential housing structure. The drive member couples the solenoid's linear motion to the lock member's engagement motion, merging multiple functions into a compact assembly that adds locking capability without proportionally increasing overall system complexity
Solution Approach 2:
The patent replaces complex mechanical linkages with an electromagnetic actuator (solenoid) to control the locking mechanism. This substitution simplifies the control system while maintaining reliable locking capability, reducing the complexity of mechanical components needed to actuate the lock
3Extent of automation
If an electromagnet is used to actuate the locking mechanism, then precise control is achieved, but the coil envelope occupies space that may interfere with magnet placement outside the coil
Solution Approach 1:
The magnet is positioned in a different spatial dimension relative to the coil envelope, located axially outside the coil rather than inside it. The drive member's axial motion brings the magnet into the coil's magnetic field zone only when needed, allowing precise electromagnetic actuation while avoiding permanent interference with magnet placement
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 precise control over wheel speed synchronization, ensuring optimal torque application to wheels with more traction, thereby enhancing vehicle performance and stability under varying driving conditions.
Implementation Method 1
a coil of wire, a drive member movable in response to a magnetic field generated by application of electricity to the coil
Implementation Method 2
one or both of the drive member and lock member include at least one magnet and the coupling between the drive member and the lock member is magnetic
Data Source
AI summary
In at least some implementations, a system for a vehicle differential having multiple gears includes a coil of wire, a drive member movable in response to a magnetic field generated by application of electricity to the coil between a first position and a second position, and a lock member coupled to the drive member for movement with the drive member throughout a range of movement of the drive member. The lock member is adapted to engage a gear of the differential when the drive member is in the second position and the lock member is adapted to be disengaged from the gear when the drive member is in the first position. In this way, the differential may be selectively locked.