Planetary Tilt-Steering Mechatronics for Narrow Vehicle Stability
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Solution Overview
Problem
Narrow-enclosed vehicles face challenges in maintaining stability during turns due to their limited track width, which restricts the generation of centrifugal forces, and existing solutions suffer from delays in tilt control and excessive power consumption.
Innovation Solution
A mechatronic system with a steering column, coaxial planetary gear sets, tilt and steering subsystems, and holding devices controlled by an electronic control unit (ECU) to manage vehicle tilt and steering, incorporating an actuator subsystem with solenoid valves and a hydraulic system to engage or disengage holding devices for power-tilt and power-steer modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vehicle uses a narrow design to reduce footprint, then the vehicle achieves smaller size and better fuel economy, but the track width is limited which restricts the maximum moment to counteract centrifugal forces during turns
Solution Approach 1:
The vehicle employs dynamic tilt control where the body actively tilts in the direction of turns to generate centrifugal moment. The tilt angle is continuously adjusted based on vehicle speed and steering input, allowing the narrow vehicle to achieve stability comparable to wider vehicles through dynamic motion rather than static width.
Solution Approach 2:
The system changes the tilt angle parameter dynamically during cornering operations. By varying the tilt angle according to vehicle speed and steering rate, the system optimizes the centrifugal moment generation, enabling stable turns despite the limited track width inherent in narrow vehicle design.
2Stability of the object's composition
If the vehicle implements continuous steering adjustments to maintain balance at low speeds, then the vehicle achieves better stability control, but the system experiences delays in tilt calculation and implementation leading to excessive power consumption
Solution Approach 1:
The system performs preliminary tilt adjustments before the vehicle reaches critical instability points. By anticipating balance requirements based on steering input and vehicle state, the control system proactively adjusts tilt angle, reducing the need for continuous corrective actions and associated power consumption.
Solution Approach 2:
Instead of continuous adjustments, the system implements periodic tilt control actions at optimized intervals. The control algorithm determines when tilt adjustments are necessary based on vehicle dynamics, applying corrections only when needed rather than continuously, thereby reducing power consumption while maintaining stability.
3Speed
If the vehicle operates at high speeds requiring counter-steering maneuvers, then the vehicle achieves better turn initiation control, but the system requires complex coordination between steering and tilt subsystems increasing system complexity
Solution Approach 1:
The control systems for steering and tilt are merged into a unified control architecture. The single control unit processes steering input and vehicle state information to simultaneously determine both steering angle and tilt angle commands, coordinating these functions as an integrated system rather than separate independent controls.
Solution Approach 2:
The control unit performs multiple functions including steering control, tilt control, and coordination between these subsystems. This universal control approach allows one component to manage complex interactions between steering and tilt, reducing the need for separate dedicated control systems for each function.
Data Source
AI summary
The mechatronic system integrates coaxial planetary gear sets with sun, planet, carrier, and ring gears to drive tilt adjustment and steering functions. A tilt subsystem driven by the rotational motion of the ring gears to adjust the tilt angle of the narrow-enclosed vehicle and a steering subsystem connected to an output shaft and configured to steer the narrow-enclosed vehicle. A first holding device, a second holding device, and a third holding device are selectively engageable to control the rotational motion of the ring gears and the carriers. An electric motor is controlled by an electric control unit to provide torque for adjusting the tilt and steering of the narrow-enclosed vehicle and an actuator subsystem is controlled by the electronic control unit to engage or disengage the first holding device, the second holding device, and third holding device.