Working principle of the solenoid valve of sweeper truck

The working principle of the solenoid valve of the cleaning sweeper truck is mainly based on the phenomenon of electromagnetic induction. When an external power source supplies power to the coil around the iron core, a magnetic field is generated inside and around the coil according to Ampere's law. The strength of this magnetic field is positively correlated with the number of turns of the coil and the current. The more turns and the greater the current, the stronger the magnetic field. The iron core is usually made of high-permeability materials, such as soft iron, which is quickly magnetized under the action of the magnetic field, greatly enhancing the magnetic flux.

The cleaning sweeper truck solenoid valve mainly controls the flow direction and flow rate of the fluid. In the Isuzu sweeper, the solenoid valve is usually used to control the flow of hydraulic oil in the hydraulic system to ensure that various components such as the sweeping disc and the suction nozzle can work normally.

1. The core advantages of solenoid valves in Isuzu street washing and sweeper truck:

A. Precise control of multiple media

Water system: Control the start and stop of high-pressure water pumps, the adjustment of water spray angles, and the dynamic distribution of flow (such as the coordination of front sprinkler and rear atomizer spray). 

Air system: Drive pneumatic actuators, such as suction cup lifting, side brush deployment/retraction, and garbage bin door opening and closing.

Hydraulic system: Manage the direction and pressure of hydraulic motors for high-power sweeping disc rotation or garbage compression device operation.

B. Intelligent operation mode switching

Through the logic control of the solenoid valve group, the "cleaning-flushing-sucking" multi-mode one-button switching is realized, which improves the adaptability to complex working conditions (such as switching from dry sweeping mode to post-rain sludge cleaning mode).

2. Technical Principles:

A. Electronic Control System

Architecture Central Control Unit: ECU receives operation panel instructions (such as "cleaning mode" button signal), calls preset control algorithm, and sends PWM (pulse width modulation) or switch signal to each solenoid valve. 

Signal Transmission: CAN bus communication is used to achieve millisecond response (typical delay <50ms) and synchronize the actions of multiple solenoid valves.

B. Coordinated control of solenoid valve group

Water system: high-pressure water pump solenoid valve (normally closed type) opens → spray bar angle adjustment valve (proportional valve) receives 4-20mA signal → flow distribution valve switches to preset opening. 

Pneumatic system: suction cup lifting valve (double electric control valve) is energized → cylinder extends → side brush deployment valve is triggered in linkage.

Hydraulic system: direction control valve reversal → sweeping disc motor accelerates to set speed (maintaining constant torque through pressure compensation valve).

Sequential control: When switching modes, ECU activates solenoid valves in a preset order (such as closing the sweeping air flow valve first, and then opening the flushing water valve) to avoid cross-flow of media.

3. Cutting-edge technology trends and innovative applications

A. Intelligent valve island system:Using modular valve islands (such as the Festo CPX series), 16-32 solenoid valves are integrated on a single substrate and connected via M12 plugs, reducing wiring by 80%. 

(2 units Isuzu FTR cleaning sweeper truck)

(Customer visit our sweeper whopshop)