Straddled Vehicle Auxiliary Speed Control
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Solution Overview
Problem
Conventional motorcycles struggle to maintain a consistent low speed on slopes and in small spaces due to varying ground surface conditions, making it difficult for riders to operate them effectively.
Innovation Solution
A straddled vehicle equipped with a first driving source for normal traveling, a second driving source for auxiliary low-speed movement, a speed detector, a physical quantity detector, and a driving controller that adjusts the second driving source to maintain a speed equal to or lower than a predetermined value, allowing for easy low-speed operation regardless of ground surface conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a motorcycle uses a single driving source for normal traveling, then the structure is simple, but the motorcycle cannot maintain consistent low speed on slopes and in small spaces
Solution Approach 1:
The driving source is segmented into two distinct systems: a first driving source (engine) for normal traveling and a second driving source (electric motor) for auxiliary low-speed movement. This segmentation allows each driving source to be optimized for its specific function, enabling consistent low-speed control on slopes and in confined spaces without compromising the simplicity of the overall structure.
Solution Approach 2:
The motorcycle is equipped with a multi-functional driving system where the first driving source handles normal traveling and the second driving source handles auxiliary low-speed movement. This universal approach allows the motorcycle to adapt to various operating conditions (flat surfaces, slopes, small spaces) using the appropriate driving source, thereby improving ease of operation across different scenarios.
2Speed
If a motorcycle uses assist motor for forward and backward movement, then low-speed operation is improved, but the speed varies according to ground inclination
Solution Approach 1:
A speed detector detects the actual traveling speed of the vehicle main body, and this detected speed is fed back to the driving controller. The controller compares the detected speed with the target speed and adjusts the driving force of the second driving source accordingly, ensuring that the motorcycle maintains consistent low speed regardless of ground inclination or load conditions.
Solution Approach 2:
The system dynamically changes the driving parameters (driving force, rotation speed) of the second driving source based on detected physical quantities such as vehicle speed, rider weight, and ground conditions. This parameter adjustment allows the motorcycle to maintain stable speed control across varying operating conditions, including slopes and different rider weights.
3Measurement precision
If a separate physical quantity detector is added for auxiliary moving mode, then measurement precision is improved, but the device complexity increases
Solution Approach 1:
A separate physical quantity detector is installed specifically for the auxiliary moving mode to detect physical quantities (such as vehicle speed, rotation speed) with high precision. This localized detection approach ensures accurate measurement for low-speed control without requiring the entire detection system to be upgraded, thereby improving measurement precision while minimizing the increase in overall device complexity.
Data Source
AI summary
A motorcycle includes an engine that generates a driving force during a normal traveling mode, and a vehicle driving motor that generates a driving force for moving a vehicle main body forward and backward during an auxiliary moving mode. A traveling speed of the vehicle main body is detected by a speed sensor, and the detected traveling speed is presented to the rider by a speedometer. A rotation speed of the vehicle driving motor or a rotation speed of a gear rotated by the vehicle driving motor is detected by a rotation speed sensor as a physical quantity that changes depending on a moving speed of the vehicle main body during the auxiliary moving mode. The vehicle driving motor is controlled based on the detected rotation speed such that the moving speed of the vehicle main body is close to or coincides with a target speed.