BorgWarner engineered the R3S turbocharging system which consists of two small high-pressure VTG turbochargers integrated with one larger low-pressure turbocharger.
BorgWarner's regulated three-stage (R3S) turbocharging system combines the benefits of two-stage turbocharging for high specific power output and parallel sequential turbocharging for best drivability. The innovative technology increases power density while improving fuel economy and reducing emissions for downsized diesel engines.
Two-stage turbocharging system with three exhaust turbochargers (parallel sequential high pressure turbos in series with a low pressure stage turbo) (Source: ATZ)
The fresh combustion air is taken in by the two-stage exhaust gas turbocharging arrangement 1, again shown by a small arrow at an inlet opening of the intake system. The combustion air first flows through a low-pressure compressor housing 3 b of the low-pressure exhaust gas turbocharger 3, is subsequently cooled down in a first charge air cooler 11 and is subsequently distributed to two separate gas-bearing branches. Thus, the combustion air is permanently conveyed through a high-pressure compressor housing 4 b of the high-pressure exhaust gas turbocharger 4 and is subsequently cooled by a second charge air cooler 12, which again cools the recompressed and thereby heated combustion air. Subsequently, the combustion air is conveyed into the cylinders of the internal-combustion engine 2 (indicated by ovals).
The first and the second charge air coolers 11, 12 are used for the intermediate cooling. The second and the third throttling elements 9 and 10, respectively, are situated at the input side and the output side of the second high-pressure compressor housing 5 b, which can be connected and disconnected. The second and the third throttling elements 9 and 10 are general valves for the shut-off as well as a bypass pipe. The bypass 7 connects the inlet of the second high-pressure compressor housing 5 b with the outlet of the second high-pressure compressor housing 5 b also in a connectable manner. On the exhaust gas side, a shut-off valve, i.e., a fourth throttling element 6, is situated in front of the inlet of the therefore connectable and disconnectable second high-pressure turbine housing 5 a in order to separate it from the exhaust gas flow. (Source: Bayerische Motoren Werke Aktiengesellschaft)
direct injection turbocharging
thorough reduction in engine friction
High output and high response were achieved by VTEC, a high-output turbocharger, direct injection technology, and a high-performance cooling system.
The VTEC variable valve train system with thoroughly reduced friction, a turbocharger with a low moment of inertia and high responsiveness, and direct injection technology to achieve good balance between high output and torque.
1994: Mercedes Benz 500i
Detroit Diesel Allison 8V92T
Lag control - stopping the compressor from stalling against pressure build up when the main throttle is closed.
A pre-compressor throttle is used to lower the pressure before the compressor inlet, thus eﬀectively increasing the corrected mass ﬂow while keeping the actual mass ﬂow within its limits.
Fuel delivery modules
Delivery modules supply fuel to gasoline or diesel injection systems and nowadays are completed integrated into a vehicle´s fuel tank. Because they take up very little room, Bosch fuel delivery modules are suited to all common fuel tank types. What is more, they are lightweight, while the high efficiency of their delivery pumps helps to reduce CO2 emissions.
小型燃料ポンプ (Photo: Honda)
Denso Fuel Pump Module
Yachiyo fuel tank
The fuel tank is one of the parts that stores automobile gasoline and light oil. Fuel is necessary for automobiles, but also a dangerous highly flammable material. Therefore, the fuel tank is positioned as an important maintenance part and Yachiyo develops it with consideration for the customer’s safety not only in the case of an automobile collision, but also during normal use, to ensure against fuel leakage.
Generally, the fuel tank is mainly made of a steel sheet, but recently plastic is used in order to make the vehicle lighter. Yachiyo prepares for the production system for both steel and plastic, depending on the customer’s request for destination and the environmental regulations there.