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July 15, 2024 — In a landmark achievement for automotive component manufacturing, the ZF Group has officially produced its 100 millionth Electric Power Steering (EPS) system. This milestone, reached over two decades after the technology's commercial introduction, signals a decisive and permanent shift in the fundamentals of vehicle control, moving from fluid mechanics to digital electronics. It underscores how a once-novel efficiency feature has become the indispensable backbone for modern, software-centric cars and trucks.
The transition from hydraulic power steering (HPS) to EPS represents one of the automotive industry's most significant under-the-hood revolutions. While hydraulic systems dominated for generations, their inherent inefficiency—constantly drawing engine power to maintain hydraulic pressure—became a major liability in an era of stringent fuel economy and emissions regulations. EPS systems, in contrast, are precision electrical devices that activate only when the driver turns the wheel, leading to typical fuel savings of up to 6% and a direct reduction in CO2 output. This operational elegance made EPS the default choice for automakers grappling with global emissions targets.
Beyond mere efficiency, the true value of EPS lies in its role as a gateway technology. It is the critical hardware platform upon which advanced driver-assistance systems (ADAS) and automated driving functions are built. The precise, software-controlled torque delivery of an EPS unit enables features like lane-keeping assist, automated parking, and even subtle steering corrections for crosswind stabilization. "The 100-millionth unit isn't just a steering gear; it's a networked sensor and actuator," explains an industry analyst. "This volume proves the infrastructure for assisted driving is now mass-market reality."
To meet diverse vehicle architectures, ZF has developed its EPS technology in three primary mechanical configurations: Column-Drive for space-constrained applications, Dual-Pinion for balanced performance, and Belt-Drive for high-torque demands in larger SUVs and light trucks. This portfolio flexibility has been crucial for widespread adoption, allowing the technology to scale from compact city cars to full-size pickups. This scalability debunks the early notion that EPS was only suitable for smaller, lighter vehicles.
The logical endpoint of this electronic evolution is steer-by-wire, a technology ZF confirms is already in global series production. Steer-by-wire severs the final physical link—the steering column—between the driver and the wheels, replacing it entirely with electronic signals. This unlocks radical new possibilities for vehicle design, such as customizable steering feel, advanced safety overlays, and the retractable steering wheels envisioned for fully autonomous cabins. EPS provides the foundational control logic and safety architecture that make this leap possible.
Exclusive Perspective: The Silent Enabler of Electrification A less celebrated but critical role of EPS is its symbiotic relationship with vehicle electrification. For battery-electric vehicles (BEVs), every watt-hour of energy conserved extends driving range. The inherent efficiency of EPS directly contributes to this goal. Furthermore, the clean, software-integrated nature of EPS aligns perfectly with the "digital native" architecture of new EV platforms from companies like Tesla, Rivian, and legacy automakers transitioning their lineups. Analysts at IHS Markit note that near-100% of new electric vehicles now launch with EPS, not just for efficiency but for its mandatory role in enabling regenerative braking coordination and one-pedal driving features that require precise torque management.
ZF's ability to reach this volume milestone is a testament to its integrated global production network, with development and manufacturing facilities strategically located across Asia, Europe, and the Americas. This localized footprint allows for close collaboration with major OEMs and ensures supply chain resilience. The company's continued investment in this network suggests it is preparing for the next wave of demand, as steer-by-wire and advanced autonomy move from premium applications to mainstream models over the coming decade.
The production of 100 million EPS units is more than a manufacturing statistic; it is a concrete measure of the automotive industry's digital transformation. As vehicles evolve into software-defined platforms, the steering system has transformed from a simple mechanical interface into a programmable, intelligent node on the vehicle's network. This milestone marks not an endpoint, but a proven foundation for the next generation of mobility.
