Introduction
In 2023, a vehicle manufacturing company enlisted our expertise for the electric power steering system implementation in their public buses. We recommended our latest R-EPS solution, specifically engineered for large commercial vehicles like city buses.
Our R-EPS solution operates as a pure electric power steering system, regulating the power steering motor’s operation and torque output. This control is facilitated through the processing and calculation of inputs from the vehicle’s driving speed, steering torque, and steering angle, managed by the steering electronic control unit (ECU). The system serves as a pivotal device, optimizing the power steering effect to ensure smooth and precise vehicle maneuverability.
Technical Features of Brogen R-EPS
Here are the technical parameters of the EPS we used in this project:
| EPS type | Rack-assist type |
| Power supply current | 50 A |
| Operating voltage | DC 24 V |
| Rack stroke & ratio | 274 mm & 50.4 mm /rev |
| Maximum pull-push force | 18 KN to 20 KN |
| Applicable vehicle information | Front axle load: 4500 kg (for reference) |
| Angle control accuracy | 1° |
| Angular velocity control accuracy | <100 ms |
| Angle control speed | <300°/s |
Here are the key features of our R-EPS solutions:
- Streamlined modification process and excellent adaptability to the recirculating ball hydraulic steering system layout.
- Reduced component count ensures high assembly efficiency.
- Responsive steering and exceptional maneuverability.
- High-efficiency design with low friction and operating noise.
- High product integration and compact structure for space optimization.
- Utilizes non-contact sensor with angle signal for precision.
- Equipped with overheating and under-voltage protection for enhanced reliability.
- Maintains steering assistance even during normal failure modes.
- Features IP67 protection for robust performance in varied conditions.
- Tailored to meet the demands of ADAS and automatic driving, particularly for large steering-by-wire chassis applications.
Installation of the R-EPS on the Pure Electric Bus
We’ve successfully integrated our EPS into the 8.5-meter pure electric bus, which has a maximum front axle load capacity of 4500 kg. Our electric power steering system has replaced several electro-hydraulic steering components originally present in the bus.
Real Vehicle Calibration and Testing
Our EPS system has undergone real vehicle calibration, ensuring optimal performance and functionality.
- Power Supply: Aligning with the original low-voltage wiring harness of the vehicle chassis, the power line is routed to the 24V battery, which then supplies power to the EPS.
- CAN Communication Integration: Receives vehicle speed signals in accordance with the vehicle CAN communication protocol.
- Activation of EPS System: Initiate the vehicle by shifting to the START gear, thereby entering the ready mode.
- Steering Function Implementation: Experience enhanced maneuverability with our EPS system’s responsive steering capabilities. From spot steering to normal road driving, our EPS provides noticeable power assistance, resulting in lighter steering torque and precise steering response.
- Active Return to Center Functionality: While navigating urban roads, our system ensures a smooth and seamless return to the center position when the steering wheel is released after turning to any angle, enhancing the overall driving experience and safety.
Contact us
Send your inquiry to contact@brogenevsolution.com and we will respond within 2 business days to see how we can empower your EV project.
Learn more about Brogen’s Power Steering Systems here:
