Gasoline systems

Already in the 1950s, the mechanical fuel injection increased the performance and reduced the fuel consumption compared to Otto engines with carburetors. Until today, Bosch continues repairing individual components of these systems.

The fuel distributor is the key element of the Bosch K- and KE-Jetronic systems. Mainly controlled by the air-flow meter, it measures the specified amount of fuel to be distributed it to the individual injection valves. It is the centerpiece of the injection system and is repaired by specialized Bosch workshops.

K-Jetronic warm-up regulators ensure a good cold start behavior and control functions such as the acceleration and full-load enrichment.

Fuel injection valves are essential components of gasoline injection systems. They are responsible for dosed injection, fuel distribution, shaping the rate-of-discharge curve and sealing off the combustion chamber.

In 1966, Bosch developed the first electric fuel pump from a roller cell pump for fuel oil burners. Down to the present day, it is still used in historic fuel injection systems.

Another milestone was the launch of peripheral pumps (flow pumps) in 1985, which gradually replaced roller cell pumps.

As early as back in 1954, the legendary Mercedes-Benz 300 SL was already equipped with a Bosch gasoline injection system. The side channel pump used for this system was the first electric fuel pump made by Bosch. It delivers fuel to the in-line fuel injection pump.

Once the engine has been switched off, the fuel accumulator maintains the pressure within the fuel system for some time to restart the engine while it is still warm.

Within the ignition distributor, the impulse generator measures the engine speed. Combining it with other values measured by additional sensors, the D-Jetronic control unit determines the proper injection timing and the amount of fuel to be injected.

Electrohydraulic KE-Jetronic safe pressure regulators allow the implementation of warm-up control, overrun fuel cut-off and speed limiting.