Vehicle Platform Torque Damping for Transient Mode Control
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Solution Overview
Problem
Vehicle systems experience transient modes due to lightweight platforms or inadequate spring constants and damping, leading to component damage and uncomfortable rides, as these modes can cause oscillatory movements that amplify axle movements and result in motor torque fluctuations.
Innovation Solution
A method and system that detect out-of-phase and in-phase conditions between a vehicle platform and propulsion units by comparing speeds and torques, and control torque to reduce these conditions, using a processor to determine damper degradation and apply damping torque to mitigate transient modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the vehicle uses a lightweight platform to reduce weight, then fuel efficiency and performance are improved, but transient modes and oscillatory movements increase causing component damage and reduced stability
Solution Approach 1:
The system continuously monitors the phase relationship between platform motion and propulsion unit motion using sensors, and adjusts propulsion unit torque in real-time based on detected out-of-phase conditions to suppress transient modes and maintain platform stability
Solution Approach 2:
The system dynamically changes the torque parameter of the propulsion units based on detected phase conditions, adjusting torque magnitude and timing to counteract out-of-phase motions and reduce oscillatory transient modes in the lightweight platform
2Stability of the object's composition
If the spring constants and damping of the suspension system are increased to reduce transient modes, then platform stability improves, but the vehicle becomes stiffer and ride comfort deteriorates
Solution Approach 1:
The system replaces passive mechanical damping (springs and shock absorbers) with active control through propulsion unit torque modulation, using electromagnetic force control to suppress transient modes without increasing mechanical suspension stiffness, thereby maintaining ride comfort
3Object-generated harmful factors
If the vehicle operates with insufficient damping to maintain comfort, then ride quality is maintained, but transient modes and oscillatory movements increase causing component damage
Solution Approach 1:
The system uses feedback from phase detection between platform and propulsion unit motion to actively control torque, suppressing transient modes that would otherwise cause component damage while maintaining the original damping characteristics that ensure ride comfort
Data Source
AI summary
A method includes detecting an out of phase condition and an in-phase condition between a vehicle platform and two or more propulsion units attached to the platform. A first speed from a first propulsion unit is compared to a second speed and a torque of one or more propulsion units is controlled to reduce the out of phase condition and/or the in-phase condition when a difference between the first speed and the second speed is greater than a threshold value. A vehicle includes a platform, two or more propulsion units attached to the platform, and a processor. The processor compares a first speed from a first propulsion unit to a second speed, detects from the comparison an out of phase condition between the platform and the two or more propulsion units, and detects from the comparison an in-phase condition between the platform and the two or more propulsion units.