NF Group Electric Hydraulic Steering Pump 380VAC 24VDC Electric Vehicle Bus Steering Pump

The steering pump is a critical component in new energy vehicles, transforming electrical energy into hydraulic force to ease driver steering effort. While conventional cars rely on engine‑driven pumps, NEVs adopt electric alternatives, mainly falling into two categories: Electro Hydraulic Power Steering (EHPS) and Electric Power Steering (EPS).

EHPS is a modernized variant of legacy hydraulic designs, substituting an electric motor for the engine while keeping the fluid circuit and hydraulic lines. An electronic control unit continuously varies motor speed according to driving speed and wheel angle, supplying flow and pressure exactly as needed. This approach leverages well‑proven hydraulic engineering, offering high assist forces that suit medium‑ and heavy‑duty commercial vehicles, including buses and trucks. The downsides are the inherent bulk of hydraulic parts (pumps, reservoirs, hoses) and residual energy losses even with smart regulation.

EPS represents a more radical shift, doing away with hydraulics altogether; here, a motor directly generates steering torque. Sensors at the steering column detect driver input and send signals to the controller, which commands the motor output, then geared to turn the wheels. This architecture brings several benefits: power draw only during active steering, cutting overall vehicle energy usage by 3‑5% and up to 40% relative to hydraulic pumps. The absence of fluid and pipes trims weight and simplifies packaging. Response times in milliseconds enable tight integration with driver‑assist systems. The variable assist profile gives a light feel in parking and a firm sensation at highway speeds. The primary limitation is motor output for very heavy vehicles. EPS now commands over 90% of the passenger‑car segment, with configurations classified as C‑EPS, P‑EPS, and R‑EPS based on motor location.

Emerging trends include dual voltage power supplies (high‑voltage battery plus a 12V/24V backup) to maintain steering during HV outages. Variable‑displacement pumps can further reduce energy use by about 25%. Manufacturers are also integrating pumps, motors, and ECUs into more compact assemblies to save space and cost.

Hebei Nanfeng Automobile Equipment (Group) Co., Ltd, founded in 1993, operates six factories and stands as a premier NEV parts supplier in China, also serving as a designated source for Chinese military vehicles. Our offerings encompass High voltage coolant heaters, electronic water pumps, BTMS, electric air compressors, EPS, EHPS, EV AC Compressors, three‑way valves, parking heaters, parking A/C units, and plate heat exchangers.

We welcome global customers to contact us for more details on our EPS and EHPS solutions.