Mobility Solutions

Eco-friendly commercial-vehicle technology Bosch CNG systems 15 to 20 percent reduction in CO2 emissions

  • Lower operating costs and emissions
  • Engine control units and injection valves for CNG engines
  • Portfolio includes technology for monovalent and dual-fuel engines
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  • September 18, 2012
  • Mobility Solutions
  • Press releases

press release

Diesel and gasoline engines that can also run on compressed natural gas are gaining in significance in the global commercial-vehicle segment. Many countries are already promoting the introduction of CNG-powered vehicles. This is because compressed natural gas (CNG) is especially eco-friendly. CNG engines emit 15 to 20 percent less CO2 than conventional diesel engines. Using natural gas also helps conserve oil reserves, while biogas opens up additional resources. Commercial-vehicle operators also benefit from the lower running cost of a CNG engine.

CNG systems for medium and heavy-duty commercial vehicles
Monovalent engines, or engines that run exclusively on CNG, are currently mainly found in urban vehicles such as buses or garbage collection vehicles. In these vehicles, CNG is injected at a pressure of roughly seven bar into the intake manifold of a converted diesel engine. For the combustion of the air-natural gas mix, the engine is also fitted with spark plugs and ignition coils. Even today, these engines are Euro VI-compliant. The dual-fuel engine is also designed for medium and heavy-duty commercial vehicles. When using this system, CNG can be used instead of diesel as much as 90 percent of the time. In the process used here, a diesel injection system ignites the gas, thus obviating the need for an additional ignition system. Engines such as these offer greater independ¬ence in areas where the gas infrastructure is not so dense, since they can run purely on diesel without any restriction. Bosch’s dependable and extremely compact NG12 CNG injector can be used in both monovalent and dual-fuel applications. This also applies to the EGC4 and EGC10 control units. In addition to conventional engine functions, they also control the gas injectors, the pressure regulation module, and the fuel tank shut-off valve, as well as high-pressure and low-pressure sensors. In dual-fuel operation, a communication interface links the CNG control unit with a separate control unit for conventional diesel injection.

CNG systems for light commercial vehicles
In light commercial vehicle, bivalent (bifuel) systems are used, in this case combining CNG and gasoline. The systems are based on modified spark-ignition engines. For this segment, Bosch offers the NG12 CNG injector, which has also worked reliably in the passenger-car segment for years now, and the NG-Motronic bifuel engine control unit, which is based on the Motronic for gasoline injection. This makes it possible to switch between natural gas and gasoline without interrupting torque, even when the vehicle is in motion. Combining the gasoline and CNG injection functions in one control unit saves costs, and reduces the effort needed to integrate the system in a light commercial vehicle.

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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.”

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PI7814 - September 18, 2012

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