Gasoline Systems Lambda sensor Lambda sensor The first lambda sensor was applied in the exhaust tract of gasoline port fuel injection engines. Since then, Bosch has applied new technology concepts to develop a versatile program of sensors. With these sensors, engine manufacturers can customize lambda control exactly to their requirements. Our lambda sensors enable compliance with all international emission regulations with gasoline port fuel and direct injection. Task At the stoichiometric point (λ = 1: one part of fuel in 14.7 parts of air) the oxygen content of the exhaust gas is ideal for the conversion of the noxious substan- Customer benefits ces in the catalytic converter. The lambda sensor ▶ Reduced emissions due to improved signal provides the engine control unit with the basis for accuracy ▶ Long lasting experience in system integration appropriate mixture formation. There are two sensor types: switching-type and wideband lambda sensors. ▶ Long lifetime (150,000 miles, 15 years) Function ▶ Switching-type lambda sensor – High characteristic curve accuracy due to controlled heater The planar switching-type lambda sensor generates a switching signal during the transition from lean to rich operation. Thus the stoichiometric point is identified – Increased flexibility of application precisely: when there is neither an excess of fuel or air, – Reduced emissions for cold and warm engine the catalytic converter works most effectively. starts due to fast sensor readiness The wideband lambda sensor provides a continuous ▶ Wideband lambda sensor – Enhanced mounting options due to tem- measurement signal from lambda = 0.65 (rich mixture) to air. It allows for more precise control arrangements perature robustness (exhaust, housing) not just with λ = 1, but over a wide range of air-fuel and preformed hose ratios. – Improved signal readiness also at λ ≠ 1 enables lower emissions during cold start and SLP-diagnoses ability – LSU-ADV: suitable for pre-turbo application due to high permanent-temperature and temperature cycling robustness Gasoline Systems | Lambda sensor Technical features Sensor type LSF Xfour LSF 4.2 LSU 4.9 Switching-type Switching-type Wideband λ = 0.65–air Measurement range Lambda control for Gasoline engines Gasoline engines Gasoline engines, diesel engines Sensor element Planar, integrated central heater Planar, integrated central heater Planar, integrated central heater Reference Pumped Air reference Pumped Sensor readiness (Fast Light-Off FLO) FLO < 7 s @ 10.5 V FLO ≤ 12 s FLO ≤ 10 s Heater power 7W 7 W @ 350 °C 7.5 W Permanent temperature exhaust gas ≤ 980°C ≤ 930°C ≤ 930°C Peak temperature exhaust 1,030°C gas (max. hours) (300 h) 1,030°C (250 h) 1,030°C (250 h) Thermo shock protection (TSP) Lifetime Control of sensor element temperature Optional Optional 150,000 miles 15 years 150,000 miles 15 years Yes 150,000 miles 15 years Yes Sensor trimming Trim resistor in connector housing Technical features Sensor type LSU 4.9 TSP LSU ADV LSU 5.2 Wideband Wideband Wideband Measurement range λ = 0.65–air λ = 0.65–air λ = 0.65–air Lambda control for Gasoline engines Gasoline engines, diesel engines Gasoline engines Sensor element Planar, integrated central heater Planar, integrated central heater Planar, integrated central heater Reference Pumped Pumped Pumped Sensor readiness (Fast Light-off FLO) FLO ≤ 12 s FLO ≤ 5 s FLO ≤ 7 s Heater power 8.4 W 8.7 W ~10 W Permanent temperature exhaust gas ≤ 930°C ≤ 980°C* ≤ 980°C Pre-turbo application Yes Peak temperature exhaust 1,030°C gas (max. hours) (250 h) 1,030°C (250 h) 1,030°C (300 h) Sensor element temperature control Yes Yes Thermo shock protection (TSP) Yes Yes Yes Lifetime 150,000 miles 15 years 150,000 miles 15 years Sensor trimming Trim resistor in Trimming of connector housing sensor element 150,000 miles 15 years Trim resistor in connector housing * Pre-turbo variant Robert Bosch GmbH Gasoline Systems Postfach 30 02 40 70442 Stuttgart Deutschland www.bosch-automotivetechnology.com Printed in Germany 292000P15F-C/CCA-201309-En © Robert Bosch GmbH 2013. All rights reserved, also regarding any disposal, exploitation, reproduction, editing, distribution, as well as in the event of applications for industrial property rights.
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