Bosch Jetronic

[Gerald Weiß]

TheBosch K-jetronic system is made up of different components, which are discussed below and their functions. Only the components related to the system are shown below. The same categories can be found in the Shop area where the available parts are displayed.

The fuel pump is used to supply the system with the necessary fuel pressure. Just after the fuel pump, a non-return valve is installed which is needed to keep the system pressurised after the engine has been switched off.

The fuel accumulator has 2 functions:

- After the engine has been switched off, the fuel system is kept under pressure by this accumulator to promote a warm start.

- The accumulator dampens out the fuel pulses generated by the fuel pump.

This control valve is used with KA-jetronic systems. Here the fuel mixture is regulated by means of a lambda-probe control system. The control valve changes the pressure between the upper and lower chamber of the fuel distributor, thus changing the fuel mixture.

The lambda-sensor (only on KA-jetronic) generates a signal that the control unit uses to adjust the fuel mixture. The lambda sensor only generates a signal if the component has a sufficiently high temperature.

The thermo time switch is used first of all to control the injection time of the cold start injector (8). If a lambda control system is fitted, this sensor is also used as an input for the control device (18).

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