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Petrol Injection 1
Petrol Injection 2
Petrol Injection 3
Petrol Injection 4
Petrol Injection 5
B-Dir. Combustion
Dir. Petrol Injection 1
Dir. Petrol Injection 2
Dir. Petrol Injection 3
Dir. Petrol Injection 4
Dir. Petrol Injection 5
Petrol Injection Kugelf.
Homog. Working
Stratified-charge Oper.
Fuel Distrib.
Induction System
Petrol Injection Signal 1
Petrol Injection Signal 2
Idle Speed Device
Mass Air Flow Sensor 1
Mass Air Flow Sensor 2
Mass Air Flow Sensor 3
System Press. Reg. 1
System Press. Reg. 2
Injection Valve
Ind. Pulse Generator
Single Point Injection 1
Single Point Injection 2
Single Point Injection 3
Single Point Injection 4
Unregistrated Air
Lambda Sensor 1 - Generally
Lambda Sensor 2 - Finger Sensor
Lambda Sensor 3 - Planar Sensor
Lambda Sensor 4 - Voltage
Lambda Sensor 5- Broadband
Lambda Sensor 6 - Repair
Thermo Time Switch
Side-channel Pump
Peripheral Pump

First Fuel Pump
Petrol Injection Pump
D-Jetronic (MPI)
KE-Jetroncic - Test, Diagn.
Vol. Air Flow Sensor
Idle Speed Device
Aux. Air Valve
Thermo Time Switch
Roller Vane Pump

Petrol injection 1
Petrol injection 2
Petrol injection 3
Petrol injection 4
Petrol injection 5
Petrol injection 6
Petrol injection 7
Petrol injection 8
Petrol injection 9
Petrol injection 10
Petrol injection 11
Petrol injection 12
Petrol injection 13
Petrol injection 14
Petrol injection 15
Petrol injection 16

Lambda Sensor 5 - Broadband

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Determining Lambda values of 0.7 to 5 with the aid of the control unit.

A sensor-technology which focuses exclusively on one ideal point is outdated. Consider the direct petrol injection engines, which feature a stratified charge operation or engines in which the control device regulates a lean combustion. In these cases a broad-band Lambda oxygen sensor is necessary. By the way, other industrial branches make use of this technology as well.

In the additional measurement area Lambda=1 is always created.

The prerequisite for the development of the broad-band sensor, was the planar technology. An additional chamber is added with an opening to the exhaust gas pipe. This chamber also receives two conductive foils. Thereby the broad-band sensor has either 4 or 5 connections. Remaining are the two for the heating voltage and one (together with ground) for the Lambda-sensor voltage.

The control device is responsible for Lambda=1 in the measuring area.

There are two additional connections: they regulate the admission of residual oxygen from the exhaust gas, via a small opening to the so-called pump-cell. The two conducting foils are positioned in such a way, that via a certain current flow, the force of attraction working on the negatively charged oxygen ions can be controlled. The aim is, that only the amoumt of residual-oxygen remains in the pump cell, that is necessary for a Lambda value of 1.

The pump-current determines the Lambda value of the exhaust gas.

Should a Lambda value of 1 on the layer boundaries between the pump-cell and the measuring area be determined, nothing at all happens. At a value of over 1 (lean), oxygen is “pumped” outwards, if the value is less than 1, oxygen is extracted from the exhaust gas. Thereby, the pump-current is the measure for the Lambda during the combustion. Continuous co-operation is thus necessary between the sensor and the control unit, to determine the Lambda value of any combustion mixture.

The diagramm shows the correlation between the pump-current and Lambda.

In the meantime, there are Lambda-sensors with an access time of only a few milli-seconds. These are able to ascertain the mixture ratios in the individual cylinders.

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