Vehicle Speed Bump Control via Coordinated Suspension and Braking
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Solution Overview
Problem
Autonomous vehicles experience uncomfortable vertical motions and potential safety hazards when passing over speed bumps due to the lack of effective solutions to reduce both impact and vertical motion during such encounters.
Innovation Solution
A method that divides the passage over a speed bump into sections, controlling the front and rear wheels separately by distributing suspension damping force, driving power, and braking force to minimize impact and vertical motion, by applying specific control signals to the suspension and braking systems based on real-time data from sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the vehicle speed is reduced before reaching the speed bump, then the impact amount is reduced, but the traveling time increases and productivity decreases
Solution Approach 1:
The system performs preliminary detection of the speed bump using sensors (camera, LiDAR, radar) and calculates the optimal speed adjustment in advance. The controller adjusts the suspension damping force and vehicle speed before the vehicle reaches the speed bump, allowing the vehicle to pass over smoothly without excessive impact while maintaining overall traveling efficiency.
Solution Approach 2:
The system dynamically changes suspension parameters (damping force) and vehicle operating parameters (speed) based on the detected speed bump characteristics. By adjusting the damping force of suspension actuators and modifying vehicle speed temporarily, the system reduces impact while minimizing the effect on traveling time.
2Stability of the object's composition
If the suspension damping force is increased to reduce vertical motion, then the ride comfort improves, but the suspension system complexity increases
Solution Approach 1:
The suspension system uses adjustable damping force actuators that can dynamically change their characteristics based on real-time conditions. The controller adjusts the damping force of front and rear suspension actuators according to the vehicle's position relative to the speed bump, enabling effective vertical motion control without requiring a completely complex suspension design.
Solution Approach 2:
The system uses sensors to detect the vehicle's position, speed, and suspension state, then feeds this information back to the controller. The controller calculates the appropriate damping force adjustments and commands the suspension actuators accordingly, creating a closed-loop control system that achieves vertical motion control without excessive complexity.
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
Effectively reduces both the impact and vertical motion of the vehicle while passing over speed bumps, enhancing comfort and safety for occupants by precisely managing the vehicle's interaction with the bump through coordinated control of suspension and braking systems.
Implementation Method 1
controlling and distributing suspension damping force to the front wheel and the rear wheel
Implementation Method 2
distributing braking force to the front wheel and the rear wheel
Data Source
AI summary
A method of controlling a vehicle when the vehicle passes over a speed bump, may include: dividing sections of the road into a first section within a first time period before the front wheel of the vehicle collides with the speed bump, a second section while the front wheel collides with the speed bump, a third section within a second time period before the rear wheel collides with the speed bump, and a fourth section while the rear wheel collides with the speed bump; and controlling and distributing at least one of suspension damping force, driving power and braking force to the front wheel and the rear wheel for each of the first section, the second section, the third section and the fourth section to reduce the amount of impact to be applied when the vehicle collides with the speed bump and to reduce a vertical motion of the vehicle that occurs while the vehicle goes over the speed bump.