Electromagnetic Suspension Stroke Control for Full-Bump Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electromagnetic suspension devices face challenges in preventing vehicles from going into full-bump or full-rebound, especially in extreme driving situations, despite the use of variable damping force dampers.
Innovation Solution
An electromagnetic suspension device with an electromagnetic actuator, an information acquisition unit, and a driving force controller that adjusts the target damping and stretching forces based on the stroke position, shifting the stroke position from end regions towards a neutral region to prevent full-bump or full-rebound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If variable damping force dampers are used to control damping operation, then ride comfort is improved, but the vehicle may still go into full-bump or full-rebound in extreme driving situations
Solution Approach 1:
The driving force controller performs preliminary action by correcting the target driving force before the electromagnetic actuator reaches the end region. When the stroke position is detected to be approaching the end region, the controller proactively corrects the target driving force to prevent full-bump or full-rebound, rather than reacting after the problem occurs.
Solution Approach 2:
The system implements feedback control by continuously detecting the stroke position of the electromagnetic actuator and using this information to correct the target driving force. The driving force controller receives feedback on the current stroke position and adjusts the driving force accordingly to maintain the actuator within the operational range and prevent end-region entry.
2Stability of the object's composition
If the electromagnetic actuator operates with high damping force, then vehicle stability is improved, but the stroke position may reach end region causing full-bump or full-rebound
Solution Approach 1:
The system applies dynamics by making the target driving force adjustable and adaptable. The driving force controller dynamically adjusts the target driving force based on the current stroke position, allowing the damping force to vary in response to operational conditions. This dynamic adjustment prevents the actuator from reaching end regions while maintaining vehicle stability.
Solution Approach 2:
The invention changes the parameter of target driving force based on stroke position. When the stroke position approaches the end region, the controller modifies the target driving force parameter to reduce the risk of full-bump or full-rebound. This parameter change allows the system to maintain stability during normal operation while preventing extreme positions.
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 inhibits vehicles from entering full-bump or full-rebound in extreme driving conditions by dynamically adjusting the driving forces, enhancing ride comfort and stability.
Implementation Method 1
The electromagnetic actuator converts rotary motion of the electric motor to linear motion of the ball screw mechanism to produce a driving force for the damping operation and extending and contracting operation
Implementation Method 2
The electromagnetic actuator includes a ball screw mechanism in addition to an electric motor. The electromagnetic actuator converts rotary motion of the electric motor to linear motion of the ball screw mechanism to produce a driving force
Data Source
AI summary
An electromagnetic suspension device includes: an electromagnetic actuator which is disposed side by side with a spring member provided between a body and a wheel of a vehicle and which produces a driving force for damping operation and extending and contracting operation; an information acquisition unit which acquires the stroke position of the electromagnetic actuator; and an ECU which sets a target damping force and a target stretching force and controls a driving force of the electromagnetic actuator by using a target driving force based on the set target damping force and target stretching force. When the stroke position acquired by the information acquisition unit is in an end region close to a stroke end, the ECU corrects the target driving force such that the stroke position shifts from the end region toward a neutral region.