Vehicle Damping Control Using Combined Front-Rear Preview Forces
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Solution Overview
Problem
Existing vehicle damping control systems consume unnecessary energy due to the lack of consideration for the relationship between road surface displacements at the front and rear wheels during preview damping control, especially when the vehicle travels on roads with repetitive undulations where the wheelbase matches half the wavelength of the road surface waveform, leading to unnecessary actuator activation.
Innovation Solution
A damping control device and method that acquires road surface displacement information for both wheels, calculates combined control forces, and distributes them based on a predetermined ratio to minimize unnecessary energy consumption by canceling out upward and downward forces when the vehicle's center of gravity is not vertically displaced, and optimizes control forces for wheels with varying performance levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If preview damping control is executed by controlling actuators based on road surface displacements at front and rear wheels independently, then vibration damping performance is improved, but unnecessary energy consumption occurs when the vehicle travels on roads with repetitive undulations where the wheelbase matches half the wavelength of the road surface waveform
Solution Approach 1:
The patent combines the control forces from front and rear wheels by calculating a combined control force that considers the relationship between road surface displacements at both wheels. This merging approach allows the system to recognize when opposing forces would cancel each other out (when wheelbase matches half wavelength of road waveform), preventing unnecessary actuator activation and reducing energy consumption while maintaining vibration damping performance.
2Speed
If actuators are controlled to respond to road surface displacements at each wheel independently, then responsiveness to road conditions is improved, but unnecessary actuator activation occurs when no vertical displacement happens at the vehicle center of gravity
Solution Approach 1:
The system uses feedback by continuously monitoring road surface displacements at both front and rear wheels, calculating the combined control force based on the relationship between these displacements. This feedback mechanism enables the system to detect when the vehicle is traveling on repetitive undulations and adjust actuator control accordingly, preventing unnecessary activation while maintaining responsiveness to actual road conditions.
3Manufacturing precision
If control forces are calculated separately for front and rear wheels based on local road surface conditions, then local vibration control is improved, but the overall system efficiency decreases due to lack of coordination between wheels
Solution Approach 1:
The patent merges the separate control force calculations for front and rear wheels into a coordinated combined control force. This approach maintains the precision of local vibration control by considering individual wheel conditions while improving overall system efficiency through coordinated control that prevents unnecessary actuator activation when road conditions cause opposing forces to cancel out.
Data Source
AI summary
A damping control device for a vehicle calculates a combined control force by adding together a control force when a front wheel passes through a predicted passing position and a control force when a rear wheel passes through a predicted passing position, and calculates a final control force for the front wheel and a final control force for the rear wheel by distributing the combined control force at a predetermined distribution ratio.