Press release #Connected mobility

Bosch presents steering systems that provide smart support and save fuel

Busworld 2017 in Kortrijk

  • Servotwin steering system enables a wide range of assistance functions.
  • Rear-axle steering makes buses more maneuverable and even more efficient in city traffic.
Joern Ebberg

Joern Ebberg >


Kortrijk, Belgium / Schwäbisch Gmünd, Germany – Electric steering is gaining popularity. As an indispensable building block for driver assistance systems such as lane-keeping support or park assist, it is a standard feature in more and more of today’s cars. Bosch is taking its comprehensive expertise in steering systems for cars and transferring it to commercial vehicles and buses, working to create technological solutions for a new era in mobility: free of accidents, stress, and emissions.

Electronic assistants make driving buses safer and easier

The Bosch Servotwin steering system is the world’s first integrated electro-hydraulic steering system for production commercial vehicles; specifically, heavy trucks and buses. Servotwin is more efficient than previous steering systems thanks to its torque overlay. It also enables driver assistance functions that make driving a bus safer and easier. One of these functions is the lane-keeping assistant, which warns the driver as soon as they unintentionally start leaving their lane. If the driver doesn’t react, the system intervenes to steer the bus back into the lane. Electric steering assists the driver in traffic jams and slow-moving traffic, too, and automatically maintains the proper distance to the vehicle ahead. The driver monitors the system and can retake control at any time. Another situation where Servotwin electric steering supports the driver is in sudden crosswinds, which can be dangerous to buses because of their large surface area. The system determines how much to correct the steering to compensate for the gusts of wind and actuates an electric motor to help with the maneuver. All in all, driving a bus has never been so safe or so easy.

A rear-axle steering system increases bus maneuverability

Bosch has redesigned electro-hydraulic rear-axle steering to make it even easier to maneuver heavy commercial vehicles. Buses with large wheelbases in particular stand to benefit, as this redesigned system makes the turning radius smaller. The resulting increase in agility is especially useful in city driving. In addition, the steering solution improves vehicle stability at high speeds, thus making it even safer and easier to change lanes on the freeway. Here is how it works: the electrohydraulic steering system is an independent power-on-demand system for the leading or trailing axles of heavy trucks and buses. What makes it special is its innovative combination of a hydraulic cylinder unit and an electronic power unit. This means the steering is controlled electronically, driven electrically, and requires neither a mechanical nor a hydraulic connection between the front and rear axles. Thanks to the power-on-demand function, energy is required only when active steering is in progress. The electric motor powers a pump, which uses a work cylinder to build up hydraulic pressure and transfer it to the rear axle. Compared to conventional steering systems, the power-on-demand solution saves up to 0.6 liters of fuel for every 100 kilometers. Bosch electrohydraulic rear-axle steering is equally suitable for integration into production vehicles as for retrofits. All geometric vehicle parameters, like the wheelbase and steering angle, are programmed individually in the steering ECU.

Mobility Solutions is the largest Bosch Group business sector. According to preliminary figures, it generated sales of 52.6 billion euros in 2022, and thus contributed almost 60 percent of total sales from operations. This makes the Bosch Group one of the leading automotive suppliers. The Mobility Solutions business sector pursues a vision of mobility that is safe, sustainable, and exciting, and combines the group’s expertise in the domains of personalization, automation, electrification, and connectivity. For its customers, the outcome is integrated mobility solutions. The business sector’s main areas of activity are injection technology and powertrain peripherals for internal-combustion engines, diverse solutions for powertrain electrification, vehicle safety systems, driver-assistance and automated functions, technology for user-friendly infotainment as well as vehicle-to-vehicle and vehicle-to-infrastructure communication, repair-shop concepts, and technology and services for the automotive aftermarket. Bosch is synonymous with important automotive innovations, such as electronic engine management, the ESP anti-skid system, and common-rail diesel technology.

The Bosch Group is a leading global supplier of technology and services. It employs roughly 420,000 associates worldwide (as of December 31, 2022). According to preliminary figures, the company generated sales of 88.4 billion euros in 2022. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. As a leading IoT provider, Bosch offers innovative solutions for smart homes, Industry 4.0, and connected mobility. Bosch is pursuing a vision of mobility that is sustainable, safe, and exciting. It uses its expertise in sensor technology, software, and services, as well as its own IoT cloud, to offer its customers connected, cross-domain solutions from a single source. The Bosch Group’s strategic objective is to facilitate connected living with products and solutions that either contain artificial intelligence (AI) or have been developed or manufactured with its help. Bosch improves quality of life worldwide with products and services that are innovative and spark enthusiasm. In short, Bosch creates technology that is “Invented for life.” The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiary and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing, engineering, and sales network covers nearly every country in the world. With its more than 400 locations worldwide, the Bosch Group has been carbon neutral since the first quarter of 2020. The basis for the company’s future growth is its innovative strength. At 128 locations across the globe, Bosch employs some 85,000 associates in research and development, of which nearly 44,000 are software engineers.

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