Off-Road Vehicle Seat Belt Controller Engine Speed
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Solution Overview
Problem
Off-road vehicles experience changes in vehicle behavior and drivability based on whether occupants are seated, leading to suboptimal output control, which existing technologies do not accurately address for improved drivability.
Innovation Solution
Incorporating a seat belt detecting system and controller that adjusts engine rotation speed based on seat belt states, allowing for smoother vehicle behavior by releasing rotation speed control when seat belts are set, and utilizing GPS for accurate speed control when occupants are present.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If vehicle speed control is performed based on vehicle speed sensor, then output control is achieved, but the control accuracy and drivability are insufficient
Solution Approach 1:
The patent changes the control parameter from vehicle speed to engine rotation speed. By controlling the engine rotation speed to a predetermined value or less instead of controlling vehicle speed, the system achieves more accurate output control with numerous pickup signals, resulting in smoother vehicle behavior and improved drivability
2Measurement precision
If engine rotation speed is controlled to predetermined speed or less, then control accuracy is improved, but vehicle speed responsiveness may be reduced
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors engine rotation speed via pickup signals and adjusts the engine output accordingly. When the seat belt is set, the controller releases the rotation speed control mode, allowing the engine rotation speed to increase and improving vehicle speed responsiveness while maintaining control accuracy through continuous feedback
3Reliability
If rotation speed control mode is maintained, then engine rotation speed is controlled, but drivability deteriorates when driver is seated
Solution Approach 1:
The patent makes the rotation speed control mode dynamic by linking it to the seat belt state. The controller automatically switches between rotation speed control mode and normal operation mode based on whether the seat belt is set. When the driver sits down and sets the seat belt, the control mode is released, allowing the engine rotation speed to increase and improving drivability while maintaining reliable control when the seat belt is not set
Data Source
AI summary
An off-road vehicle with a driver's seat; a seat belt apparatus provided for the driver's seat; a seat belt detecting device for detecting the set state of the seat belt apparatus provided for the driver's seat; and a controller for controlling the off-road vehicle. The controller has a rotation speed control mode for controlling the rotation speed of the engine to a predetermined rotation speed or less, and the controller releases the rotation speed control mode when the seat belt detecting device detects the set state of the seat belt apparatus provided for the driver's seat.