The electrohydraulic power steering pump (EHPS) supplies exactly the right amount of oil that is needed for operating hydraulic steering systems in medium to heavy commercial vehicles.
Function
Guarantees full steering power at a reduced energy consumption
The EHPS has a redundant drive unit that consists of a motor with integrated power electronics, vane pump and customer-specific mounting bracket (optional). The integrated power electronics regulates the motor speed in a highly energy-efficient manner corresponding to the requirements of the steering system (smart speed control) or to an external setpoint.
The motor is a permanently synchronized motor (PSM) with redundant, specially separated winding packages. The speed of the motor and the vane pump are identical.
The vane pump designed as a dual circuit pump consists of a housing, cover, front plate, shaft and a rotor set. The rotor set consists of the rotor, ten radially-guided vanes and the cam ring. The generated oil volume flow is proportional to the speed.
Both the motor power/speed and the transmission behavior of the pump are noise-optimized to each other for use in electric vehicles (EV).
Technical Data
Details about
EHPS power steering pump*
- [1] -Pressure port
- [2] -Rotor with vanes
- [3] -Driveshaft
- [4] -Housing
- [5] -Cam ring
- [6] -Suction port
| Delivery volume (l/min) | 25 | ||
| Max. pressure (bar) | 220 | ||
| Suction port | 1 1/16“ – 12UN 2B | ||
| Thread (suction port) | M26 x 1.5 | ||
| Pressure port | 3/4“ – 16UNF 2B | ||
| Thread (pressure port) | M18 x 1.5 | ||
| Operating temperature (°C) | -40 to +100 | ||
| Nominal voltage (V) | 24 | 48 | 400-800 |
| Rated output (kW) | 8.6-9 | 8.6-9 | 7.5-9 |
| E-motor type | PMSM (6-phase redundancy) | ||
| Power electronics and sensors | integrated | ||
| Communication | CAN ISO11898 / J1939 | ||
| Software | Autosar | ||
| Diagnosis | UDS | ||
| Safety | ASIL B (optional C/D) | ||
| Cyber Security | optional | ||
| FOTA / SOTA | optional | ||
| Weight without mount (kg) | < 19 | ||