Dual-Motor Wheel Drive Clutch Control for Mud Escape Torque
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Solution Overview
Problem
Vehicles often become stuck when one of the driving wheels gets bogged down in mud, and existing technologies lack effective solutions to prevent this situation.
Innovation Solution
A wheel drive apparatus with dual rotating electrical machines, power converters, and a clutch system that allows for switching between power transmission and interruption modes, along with a speed sensor and controller to increase torque to the stuck wheel, using harmonic currents and square-wave drives to enhance torque generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the clutch is controlled to switch to power interruption mode to prevent wheel skid, then wheel skid is reduced, but torque to the stuck wheel is insufficient causing the vehicle to remain stuck
Solution Approach 1:
The clutch is controlled to dynamically switch between power interruption mode and power transmission mode based on real-time wheel speed detection. When skid is detected, power interruption mode is activated; when skid stops, power transmission mode is activated to provide torque to the stuck wheel. This dynamic switching resolves the contradiction by adapting the torque delivery to the actual wheel conditions.
Solution Approach 2:
The system uses wheel speed sensors to continuously monitor wheel rotation and provides feedback to the control unit. Based on this feedback, the control unit determines whether skid is occurring and adjusts clutch operation accordingly. This feedback mechanism enables the system to transition from static torque delivery to adaptive torque delivery, resolving the contradiction between preventing skid and providing sufficient torque.
2Force
If the clutch is controlled to switch to power transmission mode to increase torque to the stuck wheel, then torque is increased, but wheel skid occurs reducing effectiveness
Solution Approach 1:
The clutch operation is dynamically adjusted based on real-time wheel speed feedback. When the system detects that a wheel is skidding (rotating faster than the vehicle speed would indicate), it switches to power interruption mode to prevent further skid. When the wheel stops skidding, it switches to power transmission mode to deliver torque. This dynamic control prevents the contradiction from occurring by adapting torque delivery to actual wheel conditions.
Solution Approach 2:
The control system continuously monitors wheel speed and uses this feedback to determine the appropriate clutch state. The feedback loop ensures that power transmission mode is only activated when wheel skid has ceased, and power interruption mode is activated when skid is detected. This feedback-controlled switching resolves the contradiction by ensuring torque is applied only when it will be effective.
3Reliability
If conventional single power source systems are used, then device complexity is low, but ability to prevent stuck vehicle is insufficient
Solution Approach 1:
The dual rotating electrical machine system provides multiple functions: each machine can independently drive its respective wheel, and together they can provide differential torque distribution. The clutch mechanism adds the function of selective power transmission or interruption. This multi-functionality enables the system to handle various driving conditions including stuck situations, resolving the contradiction between reliability and complexity by making the additional complexity serve multiple purposes.
Solution Approach 2:
The drive system is segmented into two independent rotating electrical machines, each capable of independent control. This segmentation allows the system to apply different torque levels to left and right wheels independently, enabling effective prevention of stuck conditions through differential torque application. The segmentation resolves the contradiction by distributing the complexity across independent modules that can be controlled separately for optimal performance.
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
Effectively prevents vehicles from becoming stuck by increasing torque to the bogged-down wheel, allowing it to escape mud and resolving the stuck situation reliably.
Implementation Method 1
a first rotating electrical machine including a first rotating shaft and a first armature winding. The first rotating electrical machine is configured to rotate the first rotating shaft... a second rotating electrical machine including a second rotating shaft and a second armature winding. The second rotating electrical machine is configured to rotate the second rotating shaft
Implementation Method 2
controlling each of the first and second power converters enables the corresponding one of the first and second armature windings to be energized. Energization of each of the first and second armature windings causes rotation of the corresponding one of the first and second rotating shafts
Data Source
AI summary
In a wheel drive apparatus, a clutch is configured to switch a coupling mode between a first rotating shaft of a first rotating electrical machine and a second rotating shaft of a second rotating electrical machine to any one of (i) a power transmission mode in which power transmission is enabled between the first rotating shaft and the second rotating shaft; and (ii) a power interruption mode in which power transmission is interrupted between the first rotating shaft and the second rotating shaft.