Transport Refrigeration Sensor CAN ID Allocation for Multi-Chamber Control
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Solution Overview
Problem
In transportation refrigeration systems, existing methods require pre-setting unique CAN IDs for sensors based on part numbers, which complicates production, maintenance, and replacement processes, especially when multiple sensors of the same type are used across different chambers.
Innovation Solution
A method where sensors send their identification codes to a control unit, which allocates corresponding CAN IDs dynamically, allowing for same-type sensors with different codes to be distinguished and easily replaced, and reporting errors for repeated codes or faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-setting CAN ID based on part numbers is used to distinguish different sensors, then sensor identification is achieved, but production and maintenance processes become complicated
Solution Approach 1:
The sensor automatically sends its identification code to the control unit after installation, and the control unit automatically allocates and binds the CAN ID without requiring manual intervention. This self-service mechanism eliminates the need for manual differentiation and configuration during production and maintenance, resolving the contradiction between reliable identification and process complexity
Solution Approach 2:
The sensor's identification code is pre-stored in its memory before installation. When the sensor is installed and powered on, it automatically transmits this pre-prepared identification code to the control unit, which then allocates the corresponding CAN ID. This preliminary preparation eliminates the need for manual configuration during installation, reducing production and maintenance complexity while ensuring accurate sensor identification
2Reliability
If different part numbers are used to distinguish sensors in the entire process, then sensor differentiation is achieved, but purchase and installation processes become more difficult
Solution Approach 1:
The system allows sensors of the same type with different identification codes to be used across multiple chambers. The control unit dynamically allocates CAN IDs based on the identification codes received from sensors during installation, enabling universal use of same-type sensors throughout the system without requiring different part numbers for different chambers, thus simplifying purchase and installation processes
Solution Approach 2:
Instead of using different part numbers (physical parameter differentiation), the system uses different identification codes (data parameter differentiation) to distinguish sensors. The control unit changes the CAN ID parameter dynamically based on the identification code received from each sensor, allowing sensors of the same type to be differentiated and allocated to appropriate chambers without complicating purchase and installation
3Loss of information
If manual differentiation of sensors is required during production and maintenance, then sensor tracking is achieved, but time consumption increases
Solution Approach 1:
The sensor automatically feeds back its identification code to the control unit after installation. The control unit receives this feedback and automatically allocates the corresponding CAN ID, binding it to the sensor. This automated feedback mechanism eliminates manual tracking and information recording, ensuring accurate sensor tracking while significantly reducing the time required for production and maintenance operations
Solution Approach 2:
The manual mechanical process of tracking and recording sensor information is replaced by an automated electronic system. The sensor electronically transmits its identification code to the control unit, which automatically processes and allocates the CAN ID. This substitution of manual mechanical tracking with automated electronic information processing eliminates time-consuming manual operations while maintaining accurate sensor tracking
Data Source
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AI summary
The present disclosure provides a transportation refrigeration system and a CAN ID allocation method for a transportation refrigeration system. The transportation refrigeration system includes: a refrigeration circuit including a compressor (1), a condenser (2), and a plurality of evaporators (41, 42) connected in parallel, all of which are connected to form a loop; a plurality of chambers (71, 72), each of the evaporators being located in one of the chambers to adjust the chamber; a plurality of sensors (51, 52) of the same type, each of the sensors being installed in one of the chambers respectively; and a control unit (6), wherein after being installed in place and energized, the plurality of sensors send their own identification codes to the control unit, and the control unit allocates a CAN ID to each of the sensors after receiving the identification codes of the sensors, so that the identification code of each sensor is bound to the corresponding CAN ID respectively.