Diesel systems for marine applications
Bosch is an internationally renowned supplier for marine diesel and heavy-fuel-oil technology. Bosch has perfect solutions for each application and upcoming emission limits, and a reliable, long-term spare parts supply.
Electronic Diesel Control (EDC) regulates the functions of the injection system in such a way that the engine provides the demanded engine torque. The injection parameters are constantly matched to the engine and the driving situation. Engines with an electronically controlled diesel system from Bosch combine maximum dynamic performance with minimum fuel consumption and emissions.
- Cleaner and economical engine operation thanks to the rapid adaptation of all injection parameters
Common Rail System
Common Rail Systems are the state-of-the-art diesel technology. Commercial-vehicle systems have solenoid injectors for high system efficiency. Pressure is generated by CP or single-cylinder pumps. With maximum system pressure between 1,600 bar and 2,500 bar the systems can achieve stringent emission targets.
The pressurized fuel is stored in a high-pressure rail from where it is directly fed to the fuel injectors. Start and shape of each injection are defined by the opening and closing of the nozzle needle in the injector.
The rail pressure can be controlled using a pressure-limiting or pressure-control valve. The injection quantity can be corrected throughout the system lifetime through the aid of software learning functions.
- Increases fuel efficiency and subsequently reduces CO2 output
- Contributes towards achieving IMO 2/3
- High torque and efficiency at low engine speeds
- Easy integration into existing and future engine platforms
- System variants for worldwide application
Modular Common Rail System
Bosch offers the first fully modular Common Rail Systems for operation in large off-highway diesel engines. Instead of the high-pressure rail these systems feature specific fuel-storage volumes in the high-pressure pump and the injectors.
High pressure is generated by single-cylinder pumps or inline pumps. The number of pump cylinders always corresponds to that of the diesel engine. The pumps comprise an integrated high-pressure accumulator, pressure sensor and pressure safety valve.
The high-pressure injectors are each equipped with their own high-pressure accumulator, safety flow limiter and solenoid valve for multiple injection. Because the injectors are connected with one another using short high-pressure lines, modular Common Rail Systems are particularly versatile.
- High injection pressure independent of engine speed
- Lower operating noise
- Reduced fuel consumption
- Adherence to stricter emission limits
- Adaptation to exhaust-gas treatment possible
- Long lifetime
Further injection systems: ZWM and UPS
The ZWM pump is a mechanically controlled in-line pump with up to 1,200 bar at the nozzle. For each pressure line there is one pump element. With a constant plunger stroke, the injected quantity can be adjusted continuously by twisting the plunger. The nozzle-holder assembly can be selected depending on supply quantity, spray shape and injection pressure.
The Unit Pump System (UPS) consists of electronically controlled single cylinder pumps and nozzle-holder assemblies. Injection pressure is up to 1,800 bar at the nozzle. Each engine cylinder is equipped with one fuel pump. A pressure balanced 2/2 way valve enables a variable start of injection which is limited by the camshaft profile.
The nozzle-holder assembly for both pump types is selected depending on supply quantity, spray shape and injection pressure.
- Established system
- Quick and continuous adjustment of injection quantity
- Highly robust, therefore suitable for many applications
Heavy-fuel-oil Common Rail System
The Bosch Common Rail System for heavy fuel oil with maximum system pressures of 1,600 or 2,200 bar variants helps engines to fulfill the IMO 2/3 emission targets. Both variants have a high pressure pump with metering unit and a flushing valve for pre-heating the fuel-accumulator system.
The 1,600 bar system uses conventional nozzle-holder assemblies. The pressurized fuel is stored in high-pressure accumulators which serve two engine cylinders each and are equipped with a pressure limiting valve and a robust injection control unit. The 2,200 bar system has solenoid injectors with integrated high-pressure accumulator and safety flow limiter. The injectors are connected with one another by short high-pressure lines.
- Potential for achievement of IMO 2/3 emission targets
- Reduced soot particle generation
- Robust system with established technology
- Worldwide service and spare part supply secured on a long-term basis
Heavy-fuel-oil single-cylinder pump
The mechanically controlled single cylinder pump for heavy fuel oil enables the achievement of IMO 2 emission targets with established, robust technology. This is mainly due to the high fuel pressure of up to 2,000 bar. Each engine cylinder is equipped with a pump with a mechanical nozzle-holder assembly. The pump is driven by roller or sliding tappets.
- Achievement of IMO 2 emission targets
- Established, robust technology, more than 40 years field experience
- Easy on-board service
- Repair by exchanging components
Exhaust-gas treatment: modular exhaust-gas system
The Bosch affiliate Bosch Emission Systems GmbH (BESG) has developed a modular exhaust-gas system with up to four part systems.
The particulate filter filters out the soot particles. It is regenerated by burning off the stored particles. This can be either achieved by internal engine measures or by targeted injection of diesel fuel into the exhaust stream. For this purpose, a Diesel Dosing System can be integrated.
The SCR catalytic converter removes the nitrogen oxides from the exhaust by reducing them into water and nitrogen. The Denoxtronic dosing System injects the reduction agent AdBlue/DEF into the exhaust stream, enabling conversion rates of more than 90%. An exhaust-gas control unit serves overall system control. For engines exceeding 560 kW, BESG develops and manufactures individual solutions based on standardized components.
- Enables compliance with next stage of emission regulations, Tier 4 final and Euro VI
- Individual solutions due to modular system design
- Flexible installation even in the most complex spaces
- High robustness and long service life
- Short development time
- Validation with little effort
- Reduced tooling costs