CAN Bus Garbage Truck Control System Wiring Simplification
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Solution Overview
Problem
Current garbage truck control systems using PLCs face issues with real-time communication, complex circuit arrangements, and high fault rates, limiting the ability to obtain and respond to engine parameters in real-time.
Innovation Solution
A bus-based garbage truck control system utilizing a CAN bus network with a cab CAN controller, valve block CAN controller, and multiple CAN buses, enabling efficient communication and control of hydraulic solenoid valves and sensors, and integrating a touch screen for operator feedback and alarm functions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PLC control mode is used in garbage truck, then distributed control is achieved, but real-time communication with chassis is poor and circuit arrangement is complex
Solution Approach 1:
The patent introduces a CAN bus as an intermediary communication network between the PLC control system and chassis components. The CAN bus acts as a mediator that enables real-time data exchange without direct complex wiring between PLC and each chassis component, solving the real-time communication problem while simplifying circuit arrangement.
Solution Approach 2:
The CAN bus provides a universal communication interface that can connect multiple different components (engine ECU, transmission, brakes, etc.) through a standardized protocol. This multi-functional communication network replaces multiple dedicated communication circuits, reducing overall system complexity while maintaining real-time communication capabilities.
2Reliability
If PLC control mode is used in garbage truck, then distributed control is achieved, but fault rate is high
Solution Approach 1:
The CAN bus implementation enables comprehensive feedback mechanisms where each node (engine ECU, transmission, sensors) continuously reports status information to the PLC controller. This real-time feedback allows for early fault detection and diagnosis, reducing overall fault rate by enabling proactive maintenance and quick response to system anomalies.
Solution Approach 2:
The patent replaces traditional mechanical and electrical wiring-based control systems with an electronic CAN bus communication system. This substitution reduces physical contact points and electrical connections that are prone to failure, thereby reducing fault rate while maintaining distributed control capabilities.
3Speed
If CAN bus is used for communication, then real-time performance is improved, but number of communication lines increases
Solution Approach 1:
The CAN bus architecture merges multiple communication channels into a single differential communication pair (CANH and CANL). Instead of requiring separate wiring for each communication channel between PLC and chassis components, the CAN bus combines all data transmission into one shared communication medium, achieving high-speed real-time communication while reducing the number of physical lines.
Data Source
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AI summary
A bus-based garbage truck control system, comprising a cab CAN controller, a touchscreen, a valve block CAN controller, first to third CAN buses, a button operation box, a rear part operating panel, a sensing switch module, a pressure sensor, and a hydraulic solenoid valve module. CAN communication between the cab CAN controller and the valve block CAN controller is carried out via the first CAN bus. CAN communication between the cab CAN controller and an engine ECU of a garbage truck is carried out via the second CAN bus. CAN communication between the cab CAN controller and the touchscreen is carried out via the third CAN bus. The first CAN bus and the third CAN bus communicate on the basis of the CANopen protocol. The second CAN bus communicates on the basis of the J1939 protocol. By employing the CAN buses, wire bundles of the entire truck are simplified, the reliability, safeness, and reparability of electrical wirings of the entire truck are increased, entire truck data sharing is implemented, and flexible configuration, compact size, and a high degree of protection are provided.