Dynamic Vehicle Speed Limiting via Seatbelt Detection
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Solution Overview
Problem
Conventional vehicles do not effectively manage driver posture stability when a body holding device, such as a seat belt, is not worn, as the set vehicle speed remains constant regardless of its use, leading to potential instability at high speeds.
Innovation Solution
A vehicle system that includes a driving unit, a body holding device, a vehicle speed sensor, a worn state detecting sensor, and a travel control unit to adjust the vehicle speed based on whether the body holding device is worn or not, setting a lower maximum speed when it is not worn to prevent excessive speed and instability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the set vehicle speed is always set to the same value (constant maximum speed), then the vehicle can operate at high speed when the body holding device is worn, but the driver's posture becomes unstable when the body holding device is not worn at high speeds
Solution Approach 1:
The maximum vehicle speed is made dynamic rather than constant. The maximum vehicle speed setting unit changes the set maximum vehicle speed based on the detected state of the body holding device. When the body holding device is detected as not worn, the set maximum vehicle speed is reduced to a lower value. When the body holding device is detected as worn, the set maximum vehicle speed is increased to a higher value. This dynamic adjustment resolves the contradiction by adapting the speed limit to the current safety conditions.
Solution Approach 2:
The patent changes the parameter of maximum vehicle speed based on the state of the body holding device. The maximum vehicle speed setting unit detects whether the body holding device is worn or not worn, and accordingly sets the maximum vehicle speed to a first value (when worn) or a second value lower than the first value (when not worn). This parameter change allows the system to maintain driver posture stability while still permitting high-speed operation when appropriate safety measures are in place.
2Productivity
If the set maximum vehicle speed is increased to allow high-speed travel, then travel efficiency is improved, but the risk of driver posture instability increases when the body holding device is not worn
Solution Approach 1:
The system changes the maximum vehicle speed parameter based on the body holding device state. When the device is worn, a higher maximum speed (first value) is set for improved travel efficiency. When the device is not worn, a lower maximum speed (second value) is set to ensure driver posture stability. This dynamic parameter adjustment allows the system to optimize for either efficiency or safety depending on the current condition.
Solution Approach 2:
The maximum vehicle speed setting unit continuously monitors the state of the body holding device through the detection unit and adjusts the maximum vehicle speed accordingly. This feedback mechanism ensures that the vehicle speed is always appropriate for the current safety condition, preventing driver posture instability while maintaining travel efficiency when conditions permit.
Data Source
AI summary
A vehicle includes a body holding device configured to hold the body of a seated driver; a travel control unit configured to drive the vehicle body so that it travels; and a maximum vehicle speed setting unit configured to set a set maximum vehicle speed. The travel control unit controls an output from the driving unit based on the operation amount of an accelerator device if the vehicle speed is lower than the set maximum vehicle speed, and restricts the output from the driving unit irrespective of the operation amount of the accelerator device if the vehicle speed is equal to or higher than the set maximum vehicle speed. The maximum vehicle speed setting unit sets, if it is detected that the body holding device is worn, a first vehicle speed as the set maximum vehicle speed, and sets, if it is detected that the body holding device is not worn, a second vehicle speed lower than the first vehicle speed as the set maximum vehicle speed.