Gasoline direct injection

Fuel supply
The fuel supply products (fuel-supply module with integrated electric fuel pump, tank level sensor and fuel filter) ensure that the high-pressure pump is provided with the required amount of fuel from the tank at a specific pressure of up to 6 bar.

Fuel injection
Engines with gasoline direct injection produce the air-fuel mixture directly in the combustion chamber. Only fresh air flows into the intake port through the open intake valve. The fuel is injected directly into the combustion chamber by high-pressure injectors. Combustion chamber cooling is improved by directly spraying the fuel in the case of gasoline direct injection. This provides for higher engine compression and, in turn, increased efficiency, which helps reduce fuel consumption and increase torque. In the case of gasoline direct injection the high-pressure circuit is fed via the high-pressure pump, which supplies the fuel pressure in the fuel rail at the required high level of up to 350 bar. The high-pressure injectors are fitted to the fuel rail, meter and atomize the fuel at high pressure extremely rapidly to provide optimum mixture preparation directly in the combustion chamber.

With port and direct gasoline injection, Bosch combines gasoline direct injection with gasoline port fuel injection. The reason for this unusual partnership is: combining two normally separate approaches for fuel injection creates one innovative system where the strengths of the partial systems perfectly complement each other. In this particular case, this leads to advantages in terms of fuel consumption and emissions – both under partial and full load. Each of the two partners lets the other take the lead when it is time to show their respective forte. Each injection system delivers its benefits in terms of fuel efficiency and the number of emitted particles (PN) under different operating conditions.

Gasoline port fuel injection shines with reduced friction losses in partial-load operation, while direct injection excels close to full load with its increased knocking limit. Combined, the systems provide an additional reduction in particle emissions – division of labor at its best.

But gasoline port fuel injection adds even more advantages to the beneficial partnership. With its good mixture homogenization, the system generates fewer particles, has lower noise levels and consumes less fuel in situations with low engine load thanks to its lower friction loss compared to direct injection.