Sensor Wheel Tracking and Braking for Shopping Cart Misuse
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Solution Overview
Problem
Existing cart containment systems are ineffective in detecting misuse such as shopping cart theft for non-motorized vehicles and do not address issues like improper use of power-assisted cart retrieval units, which can cause damage.
Innovation Solution
A system with sensor-equipped wheels that include a wheel rotation sensor, vibration sensor, VLF signal detector, EAS signal detector, and magnetic field sensor, coupled with an RF transceiver for real-time data collection and communication, enabling the tracking of cart locations and statuses, and the implementation of braking mechanisms to control cart movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing cart containment systems use simple wire-based detection, then the system cost is reduced, but the system cannot detect other types of shopping cart misuse such as theft or improper retrieval unit operation
Solution Approach 1:
The wheel assembly is designed to perform multiple functions: it contains sensors for detecting electromagnetic signals from containment wires, vibration sensors for detecting misuse events, and communication capabilities for reporting status. This multi-functional design allows a single component to address various types of cart management needs including theft prevention, retrieval unit monitoring, and containment zone detection.
Solution Approach 2:
The patent combines multiple detection capabilities (electromagnetic signal detection, vibration detection, wheel rotation sensing) into a single integrated wheel assembly. This merging of functions into one component reduces the overall system complexity compared to having separate detection systems for each function.
2Productivity
If power-assisted cart retrieval units operate without monitoring, then the operation speed is increased, but wheel damage occurs due to retrieving carts with locked or improperly oriented wheels
Solution Approach 1:
The wheel assembly includes sensors that continuously monitor the cart's status (wheel lock state, orientation, vibration levels) and communicate this information to the cart retrieval unit. This feedback mechanism allows the retrieval unit to adjust its operations in real-time, preventing damage by detecting locked wheels or improper orientations before retrieval occurs.
Solution Approach 2:
The system performs preliminary detection of potential problems (locked wheels, improper orientation) before the cart retrieval operation begins. The sensors detect these conditions in advance and alert the retrieval unit, allowing preventive action to be taken before damage can occur during the retrieval process.
3Reliability
If no real-time monitoring system is implemented, then the system cost is reduced, but the ability to track cart locations and prevent unauthorized exit is lost
Solution Approach 1:
The wheel assembly autonomously monitors its own status and the cart's location without requiring external monitoring equipment. The integrated sensors and communication system enable the cart to self-report its position and status, providing reliable tracking while minimizing the complexity of external monitoring infrastructure.
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
The system effectively prevents unauthorized cart exit, reduces wheel damage during retrieval, and optimizes cart management by enabling real-time monitoring and control of cart usage, allowing for personalized advertising and improved store planning.
Implementation Method 1
a VLF (Very Low Frequency) signal detector for detecting signals used by conventional cart containment systems
Implementation Method 2
an EAS (Electronic Article Surveillance) signal detector capable of detecting conventional EAS towers
Implementation Method 3
a magnetic field sensor capable of detecting encoded magnetic markers placed on or under store flooring or pavement to mark specific locations
Implementation Method 4
The wheel's sensor circuitry is coupled to a radio frequency (RP) transceiver system, which may but need not also be housed in the wheel or wheel assembly. The RF transceiver system provides a two-way data link
Data Source
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AI summary
A vehicle tracking system includes a wheel (32) containing sensor circuitry (88, 90, 92, 94, 96) capable of sensing various types of conditions, such as wheel rotation, wheel vibration caused by skidding, and specific electromagnetic and/or magnetic signals indicative of particular wheel locations. The sensor circuitry is coupled to an RF transceiver (82), which may but need not be included within the wheel. The wheel (32) may also include a brake mechanism (100). In one embodiment, the wheels (32) are placed on shopping carts (30) and are used to collect and monitor shopping cart status and location data via a wireless network. The collected data may be used for various purposes, such as locking the wheel of an exiting cart if the customer has not paid, estimating numbers of queued carts, stopping wheel skid events that occur during mechanized cart retrieval, store planning, and providing location-based messaging to customers.