By Robert Bosch
Read Online or Download Gasoline Fuel-Injection System K-Jetronic: Technical Instruction 96/97 PDF
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Extra info for Gasoline Fuel-Injection System K-Jetronic: Technical Instruction 96/97
Example text
The important input variable for this control unit is the signal supplied by the lambda sensor. In order to adapt the injected fuel quantity to the required air-fuel ratio with λ = 1, the Fig. 31 Additional components for lambda closed-loop control 1 Lambda sensor, 2 Lambda closed-loop controller, 3 Frequency valve (variable restrictor), 4 Fuel distributor, 5 Lower chambers of the differentialpressure valves, 6 Metering slits, 7 Decoupling restrictor (fixed restrictor), 8 Fuel inlet, 9 Fuel return line.
43) was developed specifically for testing the K- and KE-Jetronic injectors when removed from the engine. The tester checks all the functions of the injector which are essential for correct engine running: – Opening pressure, – Leakage integrity, – Spray shape, – Chatter. Those injectors whose opening pressure is outside tolerance are replaced. 5 bar below the opening pressure and held at this point. Within 60 secs, no droplet of fuel is to form at the injector. During the chatter test, the injector must generate a “chattering” noise without a fuel droplet being formed.
A highly adhesive and highly porous ceramic coating has been applied over the platinum layer at the end of the ceramic body that is exposed to the exhaust gas. This protective layer prevents the solid particles in the exhaust gas from eroding the platinum layer. A protective metal sleeve is fitted over the sensor on the electrical connection end and crimped to the sensor housing. This sleeve is provided with a bore to ensure pressure compensation in the sensor interior, and also serves as the support for the disc spring.
