Damper Control Device Using Acceleration Rate of Change
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Solution Overview
Problem
Conventional damper control devices are ineffective in preventing nosedive, squat, pitching, and rolling of a vehicle body due to time delays in responding to driving operations, as they rely on sensing acceleration or brake signals to control damping force.
Innovation Solution
A damper control device that adjusts damping force based on the rate of change in acceleration or angular acceleration, using a control unit with a differentiator, command value calculators, and actuators to dynamically control front-wheel and rear-wheel dampers, ensuring timely and effective posture control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping force is controlled based on sensed acceleration or brake signal, then vehicle posture can be stabilized, but time delay occurs in responding to driving operations
Solution Approach 1:
The control device calculates the rate of change of acceleration (jerk) to predict future acceleration trends before they fully manifest. By responding to the rate of change rather than the acceleration itself, the system takes preliminary action to counteract posture changes before they become severe, reducing the perceived response delay while maintaining reliable posture stabilization.
2Device complexity
If damping force adjustment is delayed, then system simplicity is maintained, but nosedive and squat prevention becomes ineffective
Solution Approach 1:
The invention changes the control parameter from acceleration to rate of change of acceleration (jerk). This parameter transformation allows the system to detect and respond to impending posture changes earlier in their development, improving the effectiveness of nosedive and squat prevention without requiring complex additional sensors or actuators, thus maintaining relative system simplicity.
3Ease of operation
If conventional acceleration-based control is used, then basic damping control is achieved, but rolling and pitching prevention remains ineffective
Solution Approach 1:
By monitoring the rate of change of acceleration in multiple axes, the system can detect the onset of rolling and pitching motions before they develop into significant posture changes. This preliminary detection enables the control system to apply damping forces proactively, effectively preventing rolling and pitching that would occur with reactive acceleration-based control.
Data Source
AI summary
There is provided a damper control device and a suspension apparatus that are capable of effectively preventing a posture change such as pitching or rolling of the body of a vehicle. To achieve the above object, a damper control device of the present invention is designed to control a damping force of a damper in accordance with a rate of change in acceleration or a rate of change in angular acceleration. If there is a time delay in the rising of the acceleration acting on the vehicle body with respect to the driving operation being performed by the driver of the vehicle, the rate of change in the acceleration has a phase lead relative to the acceleration, and accordingly, the rate of change has only a short time delay with respect to the driving operation.