Active Seat Suspension With Linear Motor Vibration Compensation
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Solution Overview
Problem
Existing vehicle seat suspension systems using hydraulic damping fail to effectively attenuate vibrations at higher frequencies, resulting in a bumpy ride for vehicle operators, especially at high speeds.
Innovation Solution
A suspension system incorporating a pneumatic shock absorber and a linear motor with a controller that adjusts resistance and position based on sensor data to actively compensate for vibrations, using a combination of pneumatic and active damping to counteract vibrational frequencies beyond the capability of hydraulic systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydraulic damping is used to reduce seat vibration, then low-frequency vibrations are attenuated, but high-frequency vibrations above the response rate are not attenuated
Solution Approach 1:
The patent replaces the passive hydraulic damping system with an active electromagnetic actuation system. The linear motor uses electromagnetic forces to generate compensatory motions that actively counteract vibrations across a broader frequency range, overcoming the inherent response rate limitations of hydraulic mechanisms.
Solution Approach 2:
The system transitions from static hydraulic damping characteristics to dynamic active control. The controller continuously adjusts the linear motor's output based on real-time sensor feedback, enabling the suspension to adapt its damping characteristics dynamically to match the frequency and amplitude of incoming vibrations.
2Adaptability or versatility
If hydraulic damping is used, then the system structure is simple, but the system cannot provide active compensation for high-frequency vibrations
Solution Approach 1:
The linear motor serves multiple functions: it acts as both the actuator for active vibration compensation and the positioning mechanism for the seat. The sensor system provides multi-parameter feedback (position, velocity, acceleration) that feeds into a unified control algorithm, enabling the system to handle various vibration scenarios with a single integrated architecture.
Solution Approach 2:
The controller acts as an intermediary that processes sensor data and generates appropriate control signals for the linear motor. This intermediary layer enables the complex coordination needed for active vibration compensation while maintaining a relatively simple physical structure, as the intelligence is concentrated in the control system rather than distributed across multiple mechanical components.
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
The system provides effective attenuation of vibrations across a broader frequency range, enhancing ride comfort and reducing operator fatigue by actively adjusting to detected vibrational frequencies, offering improved damping capabilities compared to traditional hydraulic systems.
Implementation Method 1
An output member of a linear motor is connected to the seat via a bracket. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates at least one of a first control signal for the linear motor to change a height of the seat in opposition to a change in the instantaneous position of the seat
Implementation Method 2
A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber
Data Source
AI summary
A suspension system for a seat of a vehicle comprises a base, a linkage, and a seat attached to the base via the linkage. A pneumatic shock absorber provides a respective resistance level against movement of the seat with respect to the base based on a corresponding pressure level of air or gas within the pneumatic shock absorber. An output member of a linear motor is connected to the seat via a bracket. A first sensor is arranged to detect first sensor data associated with an instantaneous position of the seat versus time. A controller generates at least one of a first control signal for the linear motor to change a height of the seat in opposition to a change in the instantaneous position of the seat and a second control signal to change the pressure level.