Semi-Automatic Gearbox Testbench

Introduction

Discover how a GOcontroll Moduline controller provides precise, modular control for semi-automatic gearbox testbenches, enabling efficient validation of shift logic, clutch timing, and transmission performance.

Advanced Control for Semi-Automatic Gearbox Testing

Transmission testing is a critical part of drivetrain development, especially for semi-automatic and dual-clutch systems where timing and coordination define performance. The GOcontroll Moduline series offers a robust and modular embedded control solution that integrates seamlessly into transmission testbenches. With flexible I/O configuration, real-time data logging, and full CAN/LIN communication support, Moduline controllers bring precision and efficiency to gearbox development—without requiring a complete vehicle setup.

Application Overview: Testing Semi-Automatic Gearboxes Efficiently

Semi-automatic and dual-clutch transmissions demand accurate synchronization between gear actuators, clutches, and sensors. A GOcontroll Moduline controller can act as the core of a testbench, managing both control and data acquisition. Engineers can validate:

• Gear-shift logic and clutch synchronization
• Hydraulic or pneumatic actuator response
• Sensor calibration and timing validation

Using MATLAB Simulink or Node-RED, developers can design and deploy control algorithms that simulate vehicle operation in a controlled environment. This approach reduces cost and complexity, allowing iterative testing before integrating into a full drivetrain.

Hardware Setup: Modular I/O for Actuators and Sensors

The Moduline L4 or Mini I controller serves as a scalable hardware platform. Up to eight I/O modules can be installed, providing direct connectivity for:

• Solenoid valves for hydraulic or pneumatic actuation
• Pressure sensors to monitor clutch and line pressures
• RPM encoders for input/output shaft speed
• Temperature sensors for oil and mechanical component monitoring

Each input or output channel is software-configurable through the GOcontroll Simulink blockset, allowing quick adaptation to new test setups. The modularity means the same controller can handle various gearbox architectures—from automated manuals to dual-clutch systems—simply by swapping I/O modules.

Communication: Seamless Integration via CAN and LIN

Modern transmissions rely on networked control. The Moduline series supports multiple CAN 2.0B interfaces and a LIN 2.1 bus. These enable real-time communication with gearbox ECUs or Hardware-in-the-Loop (HIL) systems.
Possible configurations include:

• Direct control of clutch and actuator systems via CAN messages
• ECU-in-the-loop testing, verifying gear logic within OEM software
• Networked synchronization, sharing timing data with other control units

This interoperability ensures that GOcontroll controllers fit seamlessly into existing development infrastructures.

Automation: Running Repeatable and Long-Duration Tests

Transmission validation requires consistency and endurance. The Moduline platform allows semi-automated test cycles for:

• Long-term endurance tests under variable load profiles
• Calibration routines for gearshift pressure and clutch bite points
• Automated fault detection and recovery sequences

With Linux-based real-time operation and integrated scheduling tools, test scripts can run autonomously for extended periods while maintaining data integrity and system stability.

Data Logging: High-Rate Acquisition Built In

Every Moduline controller supports high-frequency sampling through configurable modules and internal data storage. Using Simulink or Node-RED dataflow, engineers can capture:

• Torque and RPM data from dynamometers
• Pressure and temperature values during shifts
• Actuator current and voltage for performance analysis

Data can be logged locally or streamed to a remote server using Ethernet or Wi-Fi connections, ensuring reliable traceability of each test cycle. Integration with HANtune via XCP protocol provides real-time visualization and calibration during test execution.

Flexibility: One Platform for All Transmission Types

The true advantage of the GOcontroll Moduline system lies in its hardware and software flexibility. Whether testing:

• Automated manual transmissions (AMT)
• Dual-clutch transmissions (DCT)
• Hybrid drive units

The same controller can be adapted by configuring I/O modules and updating the Simulink model. This modularity allows engineers to move from prototype to production testing without redesigning control electronics.