Electric Vehicle Joystick With Separate Traveling Control
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Solution Overview
Problem
Existing electric vehicle operating devices, such as those with joysticks for electric wheelchairs, often experience erroneous operations where the joystick tilts forward or backward unintentionally, leading to incorrect vehicle direction and speed control, compromising operability.
Innovation Solution
The operating device features a joystick with a grippable grip that issues turning direction instructions and a separate traveling instruction portion, using different operational methods to control the vehicle's direction and speed by varying the rotating speeds of the left and right driving motors, preventing erroneous operations and enhancing usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a joystick is used for controlling both turning and traveling directions, then the device complexity is reduced, but erroneous operation occurs where the joystick tilts forward or backward unintentionally
Solution Approach 1:
The control device is segmented into two independent parts: a joystick for turning direction control and a separate traveling instruction portion for forward/backward movement. This segmentation prevents erroneous operation by eliminating the interference between turning and traveling inputs, while maintaining manageable device complexity through modular design.
Solution Approach 2:
The traveling instruction portion acts as an intermediary component that mediates between the user's traveling intent and the motor control system. By introducing this intermediate control element, the system achieves more reliable traveling direction control without requiring the joystick to handle both turning and traveling functions.
2Device complexity
If the joystick alone controls both turning and traveling, then the device complexity is minimized, but the measurement precision of control inputs deteriorates due to erroneous tilting
Solution Approach 1:
The control system is segmented into two independent input channels: joystick for turning angle detection and traveling instruction portion for forward/backward intent detection. This segmentation eliminates cross-interference between control inputs, ensuring high measurement precision for each control dimension without requiring complex sensor systems.
Data Source
AI summary
An operating device of an electric vehicle enables an electric vehicle to be operated, the electric vehicle having: left and right driving wheels; and left and right driving motors respectively independently driving these left and right driving wheels. The operating device has: a joystick operable to move so as to issue a turning direction instruction of the vehicle; and a traveling instruction portion issuing a traveling instruction of the vehicle by operation different from movement operation of this joystick. The joystick has a grip operable to be gripped by an occupant of the vehicle. By making a difference between rotating speeds of the left and right driving motors based on a combination of the turning direction instruction of the joystick and the traveling instruction of the traveling instruction portion, a gentle turn or a pivotal brake turn of the vehicle is performed.