NF Group Electric Vehicle Bus Steering Pump 1.5KW Electric Hydraulic Steering Pump

The electric power steering pump serves as the "power heart" of the steering system, converting mechanical input into hydraulic energy to provide steering assistance and significantly reduce driver effort. Unlike conventional internal combustion engine vehicles where the pump is engine‑driven, new energy vehicles (NEVs) have fully transitioned to electrically driven steering pumps, primarily categorized into Electro‑Hydraulic Power Steering (EHPS) and Electric Power Steering (EPS).

Electro Hydraulic Power Steering (EHPS)

EHPS represents the evolution of conventional hydraulic systems into the electric era, replacing the engine drive with an electric motor while retaining hydraulic lines and fluid. The ECU modulates motor speed in real time based on vehicle speed and steering angle, enabling on‑demand flow and pressure for precise assistance. Built on mature hydraulic technology, EHPS delivers robust steering power, making it ideal for light‑ to heavy‑duty commercial vehicles such as buses and trucks. 

Electric Power Steering (EPS)

EPS is a more advanced solution that completely eliminates the hydraulic system, with the motor directly providing assistance. A torque/angle sensor converts steering input into electrical signals, which the ECU processes to control the motor output, amplified through a reduction mechanism to steer the wheels. Key advantages include:

• Energy Efficiency: Consumes power only during steering, reducing overall vehicle energy consumption by 3‑5% and lowering energy use by up to 40% compared to hydraulic pumps.
• Simplified Structure: Eliminates hydraulic lines and fluid, resulting in lighter weight and more flexible packaging.
• Fast, Precise Control: Millisecond‑range motor response facilitates seamless integration with ADAS and autonomous driving.
• On‑Demand Assistance: Delivers light steering at low speeds and stable feel at high speeds.
  The main limitation is motor power constraints for heavy‑duty applications. EPS dominates the passenger car market with over 90% share and is classified into C‑EPS, P‑EPS, and R‑EPS based on motor placement.

Key Trends

Dual‑power supply configurations (high‑voltage traction battery plus 12V/24V auxiliary battery) ensure steering functionality during high‑voltage failures. Variable displacement technology further reduces energy consumption by approximately 25%. System integration—combining pump, motor, and ECU into compact units—continues to drive size, weight, and cost reductions.

About Nanfeng

Hebei Nanfeng Automobile Equipment (Group) Co., Ltd, established in 1993, is a group company with six factories and a leading supplier of NEV components in China, also designated for Chinese military vehicles. Our portfolio includes high voltage coolant heaters, electronic water pumps, BTMS, electric air compressors, EPS, EHPS, electric A/C compressors, three‑way valves, parking heaters, parking A/C units, and plate heat exchangers. We welcome inquiries from customers worldwide regarding our EPS and EHPS products.