Daimler Truck Targets Precision and Control with Servotwin Upgrade
Mercedes-Benz Trucks just raised the bar on heavy-duty truck steering. The new Servotwin system isn’t a redesign—it’s a direct upgrade. Built on the proven dual-circuit architecture, this system introduces electric steering assistance with torque overlay. The result is greater handling precision, improved safety, and lower maintenance costs.
The Servotwin system targets trucks with high front axle loads. These are the most demanding use cases—long hauls, tight urban routes, and frequent distribution stops. Daimler’s solution cuts through the complexity and delivers one clear benefit: better control.
Key Features: What’s New in the Servotwin System
This version improves nearly every metric that matters:
- Enhanced steering precision at highway speeds
- Selectable steering modes under 18.6 mph (30 km/h)
- Automatic steering wheel return to center
- Improved lane stability
- Zero-play center position
- No buffer battery required
Let’s break that down further.
Improved Handling at All Speeds
The system layers electric torque over hydraulic input. That means steering becomes more responsive at any speed, with greater stability at higher velocities. Steering corrections feel smoother, especially on highways where lane-keeping matters.
The upgrade boosts straight-line stability, reducing the vehicle’s sensitivity to ruts and uneven surfaces. Long-distance drivers benefit from reduced steering effort, while fleet owners see gains in safety and reduced driver fatigue.
Steering Customization for Urban Operations
Below 30 km/h, the driver can choose between three steering modes. These adjust both steering assistance and how quickly the wheel returns to center.
Each mode supports a different driving environment:
- Light Assistance Mode – Ideal for urban stop-and-go traffic
- Balanced Mode – Mix of precision and ease
- Heavy Load Mode – Useful for narrow depot maneuvering
Active Center Return and Zero-Play Feel
The steering wheel now automatically returns to center after cornering. This helps reduce driver fatigue during city driving or repetitive turns. There’s no more overcorrecting. The system does the centering automatically, improving comfort.
The zero-play center position gives immediate feedback. No dead zone. Just direct input and response. This makes a major difference for vehicles with variable payloads or trailers.
Servotwin by the Numbers
| Feature | Benefit |
|---|---|
| Dual-circuit system | Independent hydraulic and electric assistance |
| Electric motor integration | Steering possible even at full stop |
| No buffer battery | Lower maintenance and system weight |
| Speed-sensitive assist levels | Adjusts based on current driving conditions |
| Custom steering profiles | Three selectable modes under 18.6 mph (30 km/h) |
| Smoother lane keeping | Improved stability on highways and uneven roads |
Maintenance and Cost Reduction
A key operational advantage: no buffer battery.
The old system required a battery replacement about every three years. With the new setup, that's gone. That reduces long-term maintenance costs and removes roughly 15–20 lbs (6.8–9.1 kg) from the truck, improving fuel economy slightly. Fewer service stops mean fewer disruptions to operations.
How It Works: Electric + Hydraulic Dual Circuit
The Servotwin retains the dual-circuit architecture. One circuit uses hydraulic power, the other electric motor assistance. When the driver turns the wheel, the system calculates optimal torque, adding just enough electric force to smooth the motion.
Benefits include:
- High torque at low speeds without heavy wheel input
- Controlled feedback during tight turns
- More responsive lane changes
This isn't steer-by-wire. It keeps physical steering integrity while introducing smart torque overlay.
