Smart Handlebar Force Sensing for Utility Vehicle Motor Control
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Solution Overview
Problem
Existing utility vehicles lack efficient systems for controlling motor speed and direction based on operator input, particularly in electrically propelled delivery carts, and do not effectively manage payload weight or provide alerts for safe operation.
Innovation Solution
A handlebar system with strain gauge load cell sensors and a control module that adjusts motor speed and direction based on force and direction applied by the operator, incorporates enabling switches for contact detection, and includes a velocity sensor to calculate payload weight and generate alerts for excessive loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If strain gauge load cell sensors are integrated into the handlebar to sense operator input forces, then motor speed and direction control precision is improved, but device complexity increases due to additional sensors and control systems
Solution Approach 1:
The handlebar structure serves multiple functions: it is both the steering mechanism and the mounting structure for strain gauge load cell sensors. The chassis sleeve and handlebar interface structure simultaneously provides mechanical support and sensor mounting capability, reducing the need for separate sensor mounting hardware and simplifying the overall system.
Solution Approach 2:
The strain gauge load cell sensor acts as an intermediary element between the operator's manual input on the handlebar and the motor control system. It converts mechanical force into electrical signals that the control module can process, enabling precise control while maintaining a clear separation between mechanical and electrical subsystems.
2Ease of operation
If the handlebar is made slidable within the chassis sleeve to permit forward and backward movement, then ease of operation is improved, but stability of the vehicle control is worsened due to potential unwanted movement
Solution Approach 1:
The handlebar-chassis sleeve interface is designed with selective freedom of movement: it allows horizontal sliding along the longitudinal axis for operator comfort and adjustment, while maintaining vertical stability through geometric constraints. The oval-circular cross-section pairing creates a kinematic constraint that permits motion in one direction while preventing motion in perpendicular directions.
3Reliability
If enabling switches are added to detect operator contact with the handlebar, then safety is improved by preventing unauthorized operation, but device complexity increases
Solution Approach 1:
The enabling switch functionality is integrated into the existing handlebar assembly rather than being implemented as a separate system. The switch lever is mounted directly on the handlebar and activates through the same mechanical interface, combining the safety function with the existing operational structure to minimize additional complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise control of motor speed and direction, ensures safe operation by managing payload weight, and provides alerts for safe handling, enhancing the utility vehicle's operational efficiency and safety.
Implementation Method 1
A strain gauge load cell sensor is configured to sense a magnitude and a direction of a force exerted on the handlebar by an operator
Data Source
AI summary
A utility vehicle including a housing configured for storing goods therein during transport. A handlebar extends into a chassis sleeve defined by a chassis. The handlebar is slidably moveable forward and backward within the chassis sleeve. A sensor includes a flexible member having a first end mounted to the chassis sleeve and a second end mounted to the handlebar. The sensor is configured to sense a magnitude and a direction of a force exerted on the handlebar by an operator. A control module is in communication with the sensor and a motor. The control module is configured to control motor speed and motor direction of the motor based on the magnitude and the direction of the force exerted on the handlebar by the operator as sensed by the sensor.