Electric Suspension Actuator Control for Vehicle Dynamics
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Solution Overview
Problem
Existing electric suspension devices do not effectively suppress changes in vehicle behavior by considering all control target values for bounce, pitch, and roll orientations simultaneously, leading to incomplete control of vehicle dynamics.
Innovation Solution
An electric suspension device that includes an information acquisition unit for acquiring sprung speed, pitch rate, and roll rate, along with computation units for determining bounce, pitch, and roll target values, and a driving control unit that utilizes a combined control target load to control the actuator, ensuring comprehensive control of vehicle orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the largest control target value is selected from among calculated control target values for bounce, pitch, and roll orientations, then the control system is simple, but the control of vehicle behavior changes is incomplete
Solution Approach 1:
The patent combines multiple control target values (bounce, pitch, and roll orientations) into a single integrated control target value through addition. This merging approach ensures that all orientational control objectives are simultaneously considered in the actuator control, improving vehicle behavior control effectiveness without significantly increasing system complexity.
2Speed
If only the largest control target value is used for actuator control, then the control response is fast, but the suppression of vehicle behavior changes in all orientations is insufficient
Solution Approach 1:
The control target values for different orientations are merged by summation to create a comprehensive control target. This approach maintains fast response speed while ensuring that control actions address all orientational requirements simultaneously, not just the dominant one.
Solution Approach 2:
The patent transitions from selecting a single scalar value (largest control target) to considering a multi-dimensional control space by summing control targets across different orientations (bounce, pitch, roll). This dimensional expansion ensures comprehensive coverage of all vehicle behavior aspects.
Data Source
AI summary
Provided is an electric suspension device including an electromagnetic actuator that is provided between a body and wheel of a vehicle and generates damping force for damping vibration of the body. It includes: an information acquisition unit that acquires information on the vehicle's sprung speed, pitch rate, and roll rate; a bounce target value computation unit that computes a bounce target value for controlling the vehicle's bounce orientation based on the sprung speed; a pitch target value computation unit that computes a pitch target value for controlling the vehicle's pitch orientation based on the pitch rate; a roll target value computation unit that computes a roll target value for controlling the vehicle's roll orientation based on the roll rate; and a driving control unit that controls driving of the actuator with a control target load which is based on a sum of the bounce, pitch, and roll target values.