Vehicle Seat Dynamics for Centrifugal Force Compensation
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Solution Overview
Problem
Conventional vehicles equipped with force sensors on the riding surface face challenges in maintaining intended direction and speed due to centrifugal forces, making it difficult for passengers to operate the vehicle as intended, especially when subjected to excessive inclinations or carrying baggage.
Innovation Solution
A vehicle design incorporating a passenger seat with a drive mechanism that adjusts its angle based on input from force sensors and posture sensing units, allowing for improved operability by calculating reference inputs to align the seat surface with the intended movement direction and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle moves based on passenger posture detection using force sensors, then the vehicle can operate according to passenger intention, but the passenger cannot intuitively grasp the operation amount due to centrifugal forces causing excessive inclination
Solution Approach 1:
The system provides force feedback to the passenger through the seat by applying a counteracting force proportional to the detected operation amount. The control calculation unit calculates the operation amount based on the measurement signal from the force sensor, and the seat drive mechanism drives the seat to apply feedback force to the passenger, enabling the passenger to intuitively grasp how much operation has been made.
Solution Approach 2:
The system applies a feedback force that may be stronger than the original passenger input force to ensure the passenger can clearly perceive the operation amount even when centrifugal forces are present. This excessive feedback action overcomes the masking effect of centrifugal forces on the passenger's perception.
2Device complexity
If the vehicle uses a fixed mechanical configuration, then the structure is simple, but the passenger is subjected to centrifugal force causing excessive posture inclination and loss of control precision
Solution Approach 1:
The seat is made dynamically adjustable through the seat drive mechanism, which can change the seat's angle and position based on vehicle motion state. This dynamic adjustment allows the seat to compensate for centrifugal forces and maintain accurate operation detection while keeping the overall mechanical configuration relatively simple.
3Measurement precision
If the force sensor is disposed on the riding surface, then the operation input can be detected, but the passenger cannot know how much operation has been made when centrifugal force is exerted
Solution Approach 1:
The system uses force feedback through the seat to communicate the operation amount back to the passenger. The control calculation unit processes the measurement signal to determine operation amount, and the seat drive mechanism applies a corresponding feedback force that the passenger can feel, making the operation amount perceptible even when centrifugal forces are present.
Data Source
AI summary
To provide a vehicle having high operability and its control method. A vehicle includes a passenger seat on which a passenger rides on, a chassis that support the passenger seat, wheels that move the chassis, a force sensor that outputs a measurement signal according to a force exerted on a seat surface of the passenger seat, a drive unit that drives the passenger seat so as to change an angle of the seat surface of the passenger seat, and a control calculation unit that calculates a reference input used to drive the wheels and the drive unit based on a drive amount of the drive unit, a balanced position posture of the passenger seat, and the measurement signal from the force sensor.