Electromagnetic Actuator Force Allocation for Suspension Control
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Solution Overview
Problem
The existing electrically powered suspension systems face challenges in allocating maximum output between damping force and telescopic force when the electric motor operates near its capacity limit, leading to insufficient vibration suppression and impaired ride quality.
Innovation Solution
An electromagnetic actuator system with an information acquirer, a drive force arithmetic part, and a drive controller that calculates and adjusts target damping and telescopic forces based on stroke velocity to optimize drive force allocation, ensuring effective vibration control without compromising vehicle behavior or ride quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the electric motor operates near its output capacity limit to generate both damping force and telescopic force, then the maximum output is utilized, but the allocation of drive force between damping and telescopic operations becomes problematic
Solution Approach 1:
The patent implements dynamic adjustment of the telescopic control amount based on real-time stroke velocity detection. When stroke velocity exceeds a predetermined threshold, the telescopic control amount is reduced, and when it falls within the threshold, the reduction is relaxed. This dynamic control strategy allows the system to adaptively allocate the electric motor's maximum output between damping and telescopic forces, resolving the contradiction between utilizing maximum power and maintaining ease of operation.
2Power
If the electric motor operates near capacity limit, then maximum drive force is available, but the system cannot simultaneously secure both sufficient damping force and telescopic force
Solution Approach 1:
The patent employs dynamic control that adjusts the telescopic control amount reduction based on real-time stroke velocity monitoring. This allows the system to optimally allocate the electric motor's maximum drive force between damping and telescopic operations under different operating conditions, ensuring both vibration suppression and ride quality performance are maintained even when operating near capacity limits.
Solution Approach 2:
The system changes the control parameter (telescopic control amount) based on stroke velocity conditions. By adjusting this parameter dynamically, the system optimizes the distribution of maximum drive force between the two competing functions (damping and telescopic operations), thereby maintaining reliability of both vibration suppression and ride quality 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
The system achieves controlled vehicle vibration and maintains ride quality by dynamically adjusting force allocation, even when the electric motor is near its output capacity limit, prioritizing damping control for stability and telescopic control for ride quality.
Implementation Method 1
an electric motor configured to generate drive forces for a damping operation and a telescopic operation
Implementation Method 2
The electromagnetic actuator includes a ball screw mechanism in addition to the electric motor. The electromagnetic actuator converts the rotary motion of the electric motor into the linear motion of the ball screw mechanism.
Implementation Method 3
The damping force is a force which works in a direction opposite to a direction of a stroke velocity of the electromagnetic actuator
Implementation Method 4
the drive force for the telescopic operation means a telescopic force. The telescopic force is a force which works in a direction which has nothing to do with the direction of the stroke velocity
Data Source
AI summary
Included are an electromagnetic actuator which includes an electric motor configured to generate drive forces for a damping operation and a telescopic operation; an information acquirer which acquires a stroke velocity of the electromagnetic actuator; a drive force arithmetic part which includes a damping force calculator configured to calculate a target damping force and a telescopic force calculator configured to calculate a target telescopic force, and which obtains a target drive force based on the target damping force and the target telescopic force; and a drive controller which controls drive of the electric motor using the target drive force. The drive force arithmetic part includes an adjuster which performs an adjustment to reduce a telescopic control amount for the target telescopic force based on the stroke velocity acquired by the information acquirer.