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Working Principle and Implementation of the Vehicle-Mounted Pump CAN Bus Communication System
Release time:
2026-07-22
Source:
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Summary:
In the intelligent control systems of modern vehicle-mounted pumps, CAN Bus communication technology serves as the neural center, efficiently linking control units distributed throughout the system into an efficient, reliable real-time control network, thereby enabling a technological leap from traditional complex wiring harnesses to digital information exchange.
CAN Basic Architecture and Operating Principles of Bus Systems
CAN A bus is essentially a multi-master serial communication network. Its core design principle is that all nodes on the bus are equal and can actively transmit data, with a non‑destructive arbitration mechanism used to resolve communication conflicts. The vehicle‑mounted pump’s… CAN The bus system consists of three main components:
1.CAN Controller: Integrated within each electronic control unit, it handles communication protocols, organizes data for transmission, and filters received information.
2.CAN Transceiver: Serving as the interface between the controller and the physical bus, it converts the controller’s digital signals into differential levels for transmission on the bus, while also converting differential signals from the bus into digital signals that the controller can recognize.
3. Physical bus: Typically consists of a pair of twisted wires, referred to as CAN_H and CAN_L , the transmission line must be terminated with a termination resistor to suppress signal reflections.
Truck-mounted pump CAN Specific Implementation of Bus Communication
In the specific application scenario of truck-mounted pumps, CAN The implementation of the bus is reflected at the following levels:
1. Network Node Construction
On the truck-mounted pump, multiple critical subsystems are treated as independent entities. CAN Nodes connect to the network. These nodes typically include:
Engine Control Unit: via J1939 It communicates via a protocol to provide the network with parameters such as engine speed, coolant temperature, and oil pressure, while also receiving speed control commands from the master control unit.
Hydraulic System Controller: Responsible for controlling pump displacement and directional switching, while providing real-time feedback on key operating parameters such as main oil pressure, oil temperature, and the number of switching cycles.
Remote control system: The operator’s control commands (such as boom movements, pump start/stop, and flow rate adjustment) are encapsulated as CAN The message is transmitted to the bus via wireless or wired means.
Dashboard or Human-Machine Interface: Serving as an information display terminal, it subscribes to the required data from the bus and displays device status, fault codes, and other information in real time.
Intelligent assistance systems: such as lubrication systems, GPS The positioning module, among others, will also transmit its own status information via CAN Node reporting.
2. Application of Standardized Communication Protocols
To achieve compatibility among different vendors’ ECU Seamless communication between systems is achieved through standardized high-level protocols, which are widely adopted in the vehicle-mounted pump industry; most importantly, SAEJ1939 . This protocol defines a comprehensive application-layer specification for heavy-duty vehicles and construction machinery, specifically including:
Parameter group number: Assign a unique identifier to each type of data to be transmitted (e.g., engine speed).
Data frame structure: Clearly defines the data length, encoding scheme, and refresh cycle.
Diagnostic Information: Standardizes the format and propagation of fault codes.
3. Implementation of the Communication Process
When the operator issues a command via the remote control “ Start pumping ” During instruction execution, the communication flow is as follows:
The remote control node encapsulates commands into packets with specific identifiers, in accordance with the predefined protocol. CAN The data frame is transmitted to the bus.
All nodes on the bus receive this frame, but only the node whose identifier matches its own task—here, the hydraulic system controller—will accept and process the command.
The hydraulic system controller then actuates the solenoid valves and other actuators, initiating the pumping operation, and may also… “ Pumping has been initiated. ” The status information is sent back to the bus as feedback.
Engine ECU Additionally, nodes such as the dashboard may also receive this status information, as needed, for display or logical control.
CAN Technical Advantages of Bus Communication
CAN The application of bus technology in truck-mounted pumps has brought about a revolutionary advancement:
Wiring Simplification and Reliability Enhancement: By replacing the conventional control approach that requires a separate wire harness for each signal, this solution dramatically reduces the number of wire harnesses, connectors, and overall weight, thereby significantly lowering the incidence of connection‑related failures.
Information Sharing and System Integration: All nodes connected to the bus can readily access data from other nodes, laying the groundwork for implementing sophisticated collaborative control strategies—such as automatically adjusting pump speed based on engine load.
Powerful diagnostic capabilities: Based on standardized fault codes, technicians can quickly retrieve historical and real-time fault information for the entire system via the diagnostic interface, accurately pinpoint issues, and significantly reduce repair time.
Outstanding real-time performance and fault tolerance: The arbitration mechanism ensures that high-priority messages, such as emergency stop commands, are transmitted without delay; differential signaling provides excellent electromagnetic interference immunity, enabling the system to operate reliably in the harsh conditions of on-board pumps.
Summary
of the truck-mounted pump CAN Bus communication integrates isolated control units into a cohesive whole by establishing a standardized digital network. It serves not only as an information‑transmission channel but also as the core infrastructure for enabling device intelligence, networking, and efficient diagnostics. With technological advancements, based on… CAN Functional safety mechanisms of the bus and higher bandwidth CANFD Emerging technologies will further drive the evolution of truck-mounted pumps toward greater safety and intelligence.
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