Straddle Vehicle Low-Speed Torque Control for Directional Feel
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Solution Overview
Problem
Existing straddle vehicles lack the ability to closely mimic the intended user experience during forward and backward traveling operations, leading to a disconnect between the user's intended feeling and the actual vehicle response.
Innovation Solution
A straddle vehicle equipped with an electric motor and processing circuitry that adjusts torque and rotation speed based on user input, distinguishing between normal and low-speed modes, and varying change rates for forward and backward operations to enhance the alignment of user intent with vehicle response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle uses a single change rate for both forward and backward traveling operations, then the control system is simple, but the user's intended feeling cannot be accurately reproduced
Solution Approach 1:
The patent applies local quality by implementing different change rates for forward and backward traveling operations. The control system distinguishes between traveling directions and applies locally optimized control parameters (first change rate for forward, second change rate for backward) to match user expectations for each direction, thereby improving overall ease of operation without requiring complete system redesign.
Solution Approach 2:
The patent implements dynamics by making the change rate adaptive based on traveling direction. The control system dynamically switches between different change rates depending on whether the vehicle is moving forward or backward, allowing the control characteristics to adapt to the specific operational context and better reproduce user intent.
2Reliability
If the vehicle limits traveling speed in low-speed mode, then safety is improved, but responsiveness to user input is reduced
Solution Approach 1:
The patent applies parameter changes by implementing different change rates within the low-speed mode. Although the maximum speed is limited for safety, the system adjusts the rate at which speed changes occur based on traveling direction (faster for forward, slower for backward). This allows the vehicle to respond more quickly to user input while still maintaining safe operating speed limits.
Data Source
AI summary
There are provided a straddle vehicle and a method for controlling a vehicle. A processing circuitry of the straddle vehicle is configured to: determine whether a control mode or a low-speed mode; determine whether a user operation is a forward traveling operation or a backward traveling operation when being determined that the control mode is the low-speed mode; change a rotation speed or an output torque of an electric motor of the straddle vehicle in the positive direction at a first change rate when being determined that the user operation is the forward traveling operation; and change the rotation speed or the output torque of the electric motor in the reverse direction at a second change rate when being determined that the user operation is the backward traveling operation. An absolute value of the first change rate is larger than an absolute value of the second change rate.