Voith Retarder ECU Wg9925580120 USED FOR SITRAK TRUCK

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Voith Retarder ECU Wg9925580120 USED FOR SITRAK TRUCK

The auxiliary braking system (retarder) used in heavy trucks is commonly found in models equipped with hydraulic retarders. It helps vehicles achieve wear-free braking through hydraulic damping when descending long slopes, fully loaded, or at high speeds, reducing the burden on the main brakes, improving safety, and extending brake pad life.

FUNCTION

1. Precise Control of Retarder Braking Force Output: Real-time acquisition of signals from multiple sensors, including vehicle speed, engine speed, throttle position, brake pedal/lever position, retarder oil temperature, and gradient sensor readings. Based on driver input and vehicle status, it automatically adjusts hydraulic oil flow, pressure, and fill volume to achieve graded braking. This ensures the retarder provides smooth, shock-free continuous braking force when descending long slopes, under full load, cruising at high speeds, or in mountainous conditions, reducing the burden on the main service brake.

2. Intelligent Linkage and Integrated Control: Communicates with other ECUs in the vehicle via the CAN bus for collaborative operation. For example, it automatically activates retarding during hill start assist and cruise control; during emergency braking, it prioritizes the main brake to prevent retarder overload.

3. Safety Protection and Fault Management: Real-time monitoring of oil temperature, pressure, solenoid valves, and sensor malfunctions. When the oil temperature is too high, it automatically downshifts, limits power, or disengages retarding to prevent retarder damage. It has a built-in diagnostic function, reading/clearing fault codes via the OBD interface. A flashing retarder light or a retarder fault report on the instrument panel indicates a problem detected by the ECU.

4. Improve overall braking durability and driving comfort: The hydraulic retarder uses hydraulic shear force for braking, and the ECU precisely controls the brake pads/drums to avoid overheating and burning, thus extending the life of the braking system. The braking process is smooth and vibration-free, improving the safety and comfort of long-distance/heavy-load driving.

DETAILS

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