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For decades, Bosch drive technology has delivered efficiency, comfort, and driving enjoyment on roads around the world. Now the convenience of electronic engine management is also available for motorcycles. Bosch engine management systems (EMS) offer optimally coordinated system solutions for every type of two-wheeler – from affordable one-cylinder models in Asia to powerful big bikes in Europe and North America.
Bosch EMS are based on port fuel injection systems for cars, a solution that has already proven itself a million times over, but have been adapted to the typical motorcycle engine. Compared to carburetor engines, motorcycle engines are faster and more dynamic with improved peak performance. At the same time, they consume 7% less fuel in WMTC (world motorcycle test cycle) and even 16% less in real-world driving cycles, which are typical of urban traffic. Two-wheeler drive systems equipped with Bosch EMS operate reliably even with lower-quality gasoline, minimizing breakdowns and maintenance costs. These results depend on the optimum integration of all components into an electronically controlled system: fuel injection and supply, air management, ignition, and exhaust gas treatment as well as electronic control units.
For two-wheeler manufacturers, Bosch complete EMS systems offer top functionality and maximum system benefits. They need less time and effort for system integration and provide a quick path to series production.
Two-wheelers, motorcycles, and scooters are not purely a mode of transportation – never have been, never will be. These vehicles always contain an emotional element, even if they are used as an everyday alternative to cars. The more use they see, the greater the demand for performance and riding comfort, without harming the environment. Bosch's electronic engine management opens up more possibilities than mechanical management could dream of.
Two-wheelers with EMS are clean
Electronic engine management facilitates efficient fuel consumption. It uses the lambda value to precisely control the amount of fuel injected as well as the timing of ignition. At the same time, the system can recognize vehicle responses and adjust the engine operation accordingly.
A captivating experience every day
People who buy motorcycles aren't just looking for a way to get from here to there. They want to enjoy the ride and have fun. Mopeds, scooters, superbikes – all are vehicles for everyday as well as for leisure and sporting activities. That's why it's fitting that two-wheelers with EMS aren't just cleaner, safer, more economical, and more convenient, but they also offer a more enjoyable driving experience. The throttle response is markedly more direct, the acceleration more dynamic. An electronically actuated CVT (continuously variable transmission) offers up to 17% faster acceleration. The flow of air through the engine is more powerful and greater maximum speed is possible.
The latest in riding comfort
Different riding modes, such as eco, standard, or sporty, are possible only with electronic engine management. The engine offers three modes in one: fuel-efficient for everyday riding, power performance for all situations, and dynamic sporty fun for the weekend. Bosch engine management always ensures a smooth cold start and quiet engine operation. Those who ride often or over long distances will be thrilled with the combination of electronically controlled speed and relaxed cruising.
Thanks to the latest electronics, two-wheelers can be fully connected with smartphones. Very soon riders will be able to use apps to see their current or average fuel consumption, or even a complete profile of information about their journey. The smartphone can also activate an immobilizer by shutting off the fuel supply.
Safety in numbers
Safety systems such as ABS, ESP, or traction control are increasingly becoming standard in motorcycles. Bosch's EMS technology can connect to every type of modern safety system, paving the way for manufacturers to set up sophisticated systems networks.
Thanks to their robust combustion process, gasoline port fuel injection systems can tolerate many types of fuel, even those of lesser quality. They are set up in such a way as to make problems easy to diagnose and fix.
With the Bosch engine management system, two-wheelers can be equipped to handle both ethanol and gasoline (flex-fuel system). Riders always have the option of selecting the more affordable fuel.
Bosch engine management systems have another feature: thanks to the electronic throttle control, two-wheelers' speed can also be electronically controlled. For those who ride often or over long distances, the convenient option of electronic cruise control ensures that the rider travels at the optimum speed throughout the journey. Because the EMS regulates the speed automatically, the rider does not have to constantly adjust the throttle manually.
The spark plug in a motorcycle or scooter has to be warm enough that it doesn't get sooty, even at low engine speeds. At the same time, it can't get too hot at high engine speeds, in order to prevent auto-ignitions. Bosch spark plugs master these challenges and can always be relied upon to ignite the air-fuel mix in the engine's combustion chamber at the right moment. Riders can depend on their two-wheelers' ability to cold start and to run quietly, and they also benefit from enhanced fuel economy thanks to optimized combustion.
The high-energy sparks needed for ignition are generated by the ignition coil, which transforms the electrical energy into up to 30,000 volts, stores it temporarily, and then delivers a high-voltage surge to the spark plug at the moment of ignition.
It's the innovative technology and superior quality of Bosch spark plugs that make them the choice of vehicle manufacturers worldwide.
Electronic management facilitates efficient fuel combustion. An EMS can precisely control the amount of fuel injected as well as the timing of ignition; EMS technology also makes it possible to carefully manage the engine by monitoring vehicle feedback and adapting accordingly. Based on the lambda value, regulation of the fuel injector valve ensures the optimum combination of air and fuel. The result is fuel economy and clean exhaust.
The core of Bosch's EMS technology is a smart, flexible, lightweight, and compact electronic control unit that is resistant to water, extreme temperatures, and vibrations in harsh conditions. Electronic engine management also allows for auto-stop and start-stop functions. This reduces fuel consumption and CO₂ emissions by 7% in WMTC (World Motorcycle Test Cycle) and up to 16% in real-world driving cycles, particularly in the stop-and-go traffic of major cities.
Around the world, statutory emissions standards are changing at different rates. At the same time, customers are becoming more environmentally conscious and their tolerance for conventional, inefficient technology is wearing thin.
Two-wheelers with EMS enable OEMs to meet current and future emissions requirements (CO, HC and NOx, for example, for EUIII/EUIV or BSIII/BSIV).
Bosch's switching-type lambda sensor is a state-of-the-art technology for effectively treating exhaust gases in gasoline-fueled motorcycles. The sensor generates a switched signal during the transition from lean to rich operation. That precisely identifies the stoichiometric point (lambda = 1), where the catalytic converter can operate most efficiently. The result is reliable adherence to even the strictest exhaust gas and diagnostic regulations.