ELECTRICS
Heated Lambda Sensor LSH
* Versions
Bosch has a number of versions of its heated lambda sensor available
- 3-pole version
- 3-pole version with additional grounding by cable
- 3-pole version with additional grounding by cable, for lean-burn
Applications (LSM Ⅱ), And
- 4-pole version, isolated ground
* Advantages
- Efficient closed-loop control even at low exhaust-gas temperatures (e.g.at idle).
- Flexibility of installation, considerable latitude regarding mounting methods.
- Efficient functioning depends led on exhaust-gas temperature.
- Lambda control comes into effect more quickly after theengine starts.
- mproved exhaust-gas figures due to improved sensor dynamics.
- Reduced danger of contamination leads to longer service life.
From the construction viewpoint, the major differences between the LSF sensor & the LSH
The LSF sensor element is fixed in the sensor housing by means of a ceramic seal packing.
The double-wall protective tube was specially designed for the planar sensor and provides the sensor element with highly effective protection against excessive thermal and mechanical stresses.
* Special Characteristics
- Short start-up times for the Lambda closed-loop control.
Stable control characteristics - Lower heater rating
- Small size
- Low weight & Isolated-ground design
Special control electronics are required for the LSU sensor (evaluation circuit).
This contains not only the internal control electronics for the pump& sensor cells as required for generation of the sensor signal, but also the control electronics for controlling the sensor’s temperature.
As a result, novel applications become possible.
- Control also possible at λ > I&λ < I
- Continuous Lambda control at λ = I
- Diesel-engine control
- Lean-burn concept for SI engines
- Gas-engine control
