Mobility Solutions

Generator technology Bosch eco-innovations: fine-tuning for the CO2 fleet target

  • EU recognizes two new Bosch generator technologies as eco-innovations
  • Three Bosch eco-innovations – no other supplier offers more
  • Highly efficient generators reduce CO2 emissions
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  • May 05, 2015
  • Mobility Solutions
  • Press releases
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press release

Lawmakers have mandated economical, low-emission vehicles, but drivers are looking for fun, not just efficiency. Now Bosch has shown that these two goals can be reconciled thanks to their latest eco-innovations. Generators with high-efficiency diodes (HEDs) and synchronous active rectification (SAR) have now been officially recognized by the EU. These technologically advanced components make vehicles more efficient and more economical, so they are able to meet the European Commission’s strict CO2 targets. European regulations set an average emissions limit of 95 grams of CO2 per kilometer for new vehicles starting in 2021. That equates to fuel consumption of just over 4 liters per 100 kilometers. In 2013, average CO2 emissions from new vehicles were still 132.9 grams per kilometer.

With the “eco-innovation” label, the EU recognizes particularly eco-friendly technologies. Vehicle manufacturers can have these technologies count as CO2 credits toward calculating their fleet fuel economy figures. The maximum permissible credit is seven grams per kilometer. Bosch is the only supplier already offering three EU-recognized eco-innovations: a navigation-based battery management system for hybrid vehicles plus the two new generator technologies.

“Bosch is improving every aspect of the internal-combustion engine,” says Dr. Rolf Bulander, member of the board of management of Robert Bosch GmbH. The new generators are a case in point: thanks to their excellent efficiency, the HED and SAR generators alone reduce CO2 emissions by one to two grams. At the same time, they provide more electrical power than standard generators when starting and at low engine speeds.

High efficiency reduces emissions
Generators are the power stations on board every vehicle. They reliably provide power to the safety, convenience, assistance, and injection systems as well as to engine management. They also recharge the car battery. To do this, generators convert mechanical energy into electrical energy. The higher the generator’s efficiency, the lower the vehicle’s fuel consumption and hence its CO2 emissions. To increase the efficiency, Bosch engineers took a close look at numerous generator details and made improvements, especially in the area of losses arising from rectification of the alternating current generated.

The high-efficiency diodes developed in-house reduce the generator’s CO2 emissions by up to 1.3 grams per kilometer. In addition, compared to standard generators, this efficient version delivers five to seven amperes more at low engine speeds. That is particularly important, since on-board power consumers need a reliable power supply even at low revs. The generator with synchronous active rectification even offers some ten amperes more than normal generators, reducing CO2 emissions by up to two grams per kilometer. With this technology, the diodes are replaced by high-performance transistors. Both generator versions are highly efficient and help make the vehicle more eco-friendly – something the EU has confirmed by recognizing them as eco-innovations.

Mobility Solutions is the largest Bosch Group business sector. In 2015, its sales came to 41.7 billion euros, or 59 percent of total group sales. This makes the Bosch Group one of the leading automotive suppliers. The Mobility Solutions business sector combines the group’s expertise in three mobility domains – automation, electrification, and connectivity – and offers its customers integrated mobility solutions. Its 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 375,000 associates worldwide (as of December 31, 2015). The company generated sales of 70.6 billion euros in 2015. Its operations are divided into four business sectors: Mobility Solutions, Industrial Technology, Consumer Goods, and Energy and Building Technology. The Bosch Group comprises Robert Bosch GmbH and its roughly 440 subsidiaries and regional companies in some 60 countries. Including sales and service partners, Bosch’s global manufacturing and sales network covers some 150 countries. The basis for the company’s future growth is its innovative strength. Bosch employs 55,800 associates in research and development at 118 locations across the globe. The Bosch Group’s strategic objective is to deliver innovations for a connected life. 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.”

Further information is available online at and,

PI8861 - May 05, 2015

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