4.14. Systems of injection of fuel
System of injection of L-Jetronic fuel
The system of injection of Bosch L-Jetronic fuel was applied on the majority of the E28 models (“an old sample”). In this fuel system of injection with electronic control it is used on each cylinder on one solenoidal injector. The system copes the Electronic Control unit (ECU) which processes information received from various sensors, and further makes for cylinders an exact dosage of fuel, regulating time of an open condition of an injector. The electric fuel pump through lines of supply of fuel and the filter built in the line provides giving under a high pressure of fuel to injectors. The regulator of pressure provides supply of fuel under optimum pressure, allowing pressure to fall and increase depending on turns and engine loading. All surpluses of fuel on the separate line come back back to a fuel tank.
The sensor continuously measures amount of arriving air, and ECU in an air line of an admission of air for receiving an optimum ratio of a mix air / fuel regulates a fuel mix.
Other components which are a part of system, the sensor of temperature of a cooler, the sensor of provision of a throttle, the valve of stabilization of turns of idling (which for stabilization of turns of idling air takes away, passing the throttle valve) both the related relays and safety locks are the throttle valve (which operates an air stream).
System of injection of Motronic fuel
The Motronic system unites in one block management of fuel of system of injection of L-Jetronic with management of the ignition moment, turns of idling and release.
Functions of management by injection of fuel and turns of idling are similar to the functions of L-Jetronic system described above. For additional data on Motronic system address to Head of the Control system of the engine and decrease in toxicity of the fulfilled gases.
The oxygen sensor on late models with the catalytic converter is established in release system, This sensor continuously measures the content in the fulfilled gases concentration of oxygen. This information is used by ECU for adjustment of duration of injection, giving opportunity to establish structure of a fuel mix for optimum efficiency of the converter and a toxicity minimum.