Motorcycle Suspension Damping Control for Comfort and Steering Stability
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Solution Overview
Problem
Existing control systems for two-wheeled vehicles struggle to maintain steering stability while preventing a decrease in riding comfort, especially when encountering varying road surfaces and during braking operations.
Innovation Solution
A control device that adjusts the damping force of the damping device by using angular velocities and velocities of the front and rear wheels, employing a reference unit, correction unit, and target setting unit to calculate target currents for the damping force control valve, ensuring appropriate damping force distribution based on the vehicle's state, including the direction and magnitude of angular velocities and velocities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If damping force is increased to suppress rotational movement and improve riding comfort, then steering stability deteriorates
Solution Approach 1:
The damping force is made dynamically adjustable based on real-time detection of angular velocities. The control device calculates the first angular velocity (vehicle body rotation) and second angular velocity (unsprung part rotation) and adjusts damping force accordingly, allowing the system to adapt between comfort and stability requirements under different operating conditions
Solution Approach 2:
The damping force parameter is changed based on the relationship between first and second angular velocities. When the directions of rotation match, higher damping force is applied to suppress rotational movement and improve comfort. When directions differ, lower damping force is applied to maintain steering stability, thus optimizing the parameter based on operational state
2Stability of the object's composition
If damping force is decreased to improve steering stability, then riding comfort deteriorates
Solution Approach 1:
The system dynamically adjusts damping force based on real-time angular velocity detection. When steering stability is prioritized (different rotation directions detected), damping force is reduced. When road surface irregularities are detected (same rotation directions), damping force is increased to maintain comfort, thus dynamically balancing the two requirements
3Reliability
If damping force is increased to suppress rotational movement caused by road surface irregularities, then handling performance deteriorates
Solution Approach 1:
The damping force parameter is adjusted based on the relationship between first and second angular velocities. When road surface irregularities cause rotational movement (same direction), damping force is increased to suppress vibration and maintain comfort. When handling operations occur (different directions), damping force is reduced to preserve handling performance
Data Source
AI summary
A control device controls a damping force of a damping device, which damps a force generated between a vehicle body of a two-wheeled vehicle and at least one of a front wheel and a rear wheel, by using an angular velocity of rotational movement in a front-rear direction of an unsprung part of the two-wheeled vehicle, which is generated due to a difference between a velocity in an up-down direction of the front wheel and a velocity in the up-down direction of the rear wheel.