Electromagnetic Suspension Actuator Friction Control
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Solution Overview
Problem
Existing electromagnetic suspension apparatuses face challenges in effectively utilizing frictional force for improved ride comfort and steering stability, particularly due to high mechanical friction in low temperature environments and varying vehicle states.
Innovation Solution
An electromagnetic suspension apparatus that includes an electromagnetic actuator, an information acquisition unit for collecting vehicle state information, an equivalent frictional force calculation unit, and a driving force control unit to calculate and adjust the target driving force based on the calculated frictional force, optimizing the use of frictional force for vibration damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction measurement driving force is applied to eliminate mechanical friction, then driving force transmission is improved, but frictional force cannot be effectively utilized for vibration damping
Solution Approach 1:
The patent implements dynamic adjustment of the target driving force based on real-time frictional force calculations. The control unit dynamically modifies the driving force command to electromagnetic actuators according to calculated friction characteristics, enabling the system to adapt to varying friction conditions while maintaining effective vibration damping performance.
Solution Approach 2:
The patent employs feedback mechanisms where the actual driving force and motion state are continuously monitored, frictional force is calculated based on this feedback information, and the target driving force is corrected accordingly. This closed-loop control ensures both reliable driving force transmission and effective utilization of frictional force for vibration damping.
2Reliability
If frictional force is reduced through control correction, then driving force transmission is improved, but ride comfort and steering stability deteriorate
Solution Approach 1:
The patent converts the harmful effect of mechanical friction into a beneficial force for vibration damping. By calculating the frictional force and incorporating it into the target driving force correction, the system utilizes friction that would otherwise be wasted to improve ride comfort and steering stability, transforming a disadvantage into an advantage.
Solution Approach 2:
The patent changes the control parameter from simply reducing friction to optimally utilizing frictional force. The target driving force is adjusted based on calculated friction characteristics, allowing the system to operate in a regime where friction contributes positively to vibration damping while maintaining reliable driving force transmission.
3Adaptability or versatility
If frictional force is moderately present, then vibration damping is improved, but driving force transmission becomes insufficient
Solution Approach 1:
The patent implements dynamic balancing between friction utilization and driving force transmission. The control unit continuously adjusts the target driving force based on real-time friction calculations and vehicle state information, optimizing the balance between utilizing friction for vibration damping and maintaining sufficient driving force transmission under varying operating conditions.
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
The apparatus effectively utilizes frictional force for improved ride comfort and steering stability by dynamically adjusting the driving force based on vehicle state information, enhancing vibration damping performance.
Implementation Method 1
an electromagnetic actuator which is provided in parallel with a spring member provided between a vehicle body and a wheel of a vehicle and generates a driving force related to vibration damping of the vehicle body
Implementation Method 2
The electromagnetic actuator is configured to include a ball screw mechanism in addition to the electric motor. The electromagnetic actuator operates to generate the driving force related to the vibration damping of the vehicle body by converting rotational motion of the electric motor into linear motion of the ball screw mechanism
Implementation Method 3
a frictional force is generated in an internal mechanism such as a ball screw mechanism. For example, when the vehicle starts in a low temperature environment, the frictional force is large because viscosity of grease present in the internal mechanism of the electromagnetic actuator is high
Data Source
AI summary
An object of the present invention is to obtain an electromagnetic suspension apparatus capable of quickly reducing an influence of a mechanical frictional force generated in each part of an electromagnetic actuator. The electromagnetic suspension apparatus includes an electromagnetic actuator that generates a driving force related to a damping operation and an expansion and contraction, an information acquisition unit that acquires vehicle state information including a stroke speed of the electromagnetic actuator, an equivalent frictional force calculation unit that calculates an equivalent frictional force of the electromagnetic actuator based on the vehicle state information, and an ECU that calculates a target driving force of the electromagnetic actuator and controls the driving force of the electromagnetic actuator using the calculated target driving force. The ECU corrects the target driving force based on the equivalent frictional force calculated by the equivalent frictional force calculation unit.