BOSCH氧传感器LSU4.9.pdf-资料库

Technical Product Information Y 258 E00 015e Seite/Page 1 von/of 13 Datum/Date 14.6.2005 Produkt / Product: Typ / Type: Bemerkung / Comment: Nr. Index 1 Seite Page - Änderung Revision Erstausgabe / First Edition translation to English Planar Wide Band Lambda Sensor LSU4.9 All data given in this document are nominal values and might be subject of change at all time. Datum Date 14.6.05 26.8.05 GS-EX/ENG6- Ham gez Hamann GS-EX/ENG6 GS-EX/ENG gez Meier gez. Stanglmeier 1. 2. 3. 4. 5. Contents Characteristics Application conditions Functional values Installation instructions General operating instructions 2 5 7 9 12 ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 2 von/of 13 Datum/Date 14.6.2005 1. 1.1 1.2 General The wide band lambda sensor LSU is a planar ZrO2 dual cell limiting current sensor with an integrated heater. It is used to measure the oxygen content and the λ-value of exhaust gases in automotive engines (gasoline and die- sel). Its monotonic output signal in the range of λ=0.65 to air makes the LSU capable of being used as an universal sensor for λ=1 measurement as well as for other λ ranges. The connector module contains a trimming resistor, which defines the characteristics of the sensor and is necessary for the sensor function. The wide band sensor LSU operates only in combination with a special LSU control unit (e.g. AWS control box, LA4 or CJ125 IC). Characteristics Circuit of LSU and control unit APE ← Ip red Trimming Resistor 30-300 Ohm green AWS ← Ipmeas Measuring Resistance 61.9 Ohm IP IA + − IPN yellow VM=2,5V RE UN + − Reference Voltage 450 mV VCC RV Sensor Cell O2, CO, HC, H2 O2− O2− H- H+ 20 µA Reference Pump Current Ri-control − + black white grey red yellow white grey green black Electrical connection: Pin1: Pumping Current APE Pin2: Virtual Ground IPN Pin3: Heater Minus H- Pin4: Heater Vbatt H+ Pin5: Trim Current RT Pin6: Nernst Voltage RE+ ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 3 von/of 13 Datum/Date 14.6.2005 Sensor element The heater supply voltage must be controlled, so that the temperature of the sensor is kept at the operation point. The temperature is measured by measuring the internal resistance of the sensor’s Nernst cell Ri,N Nominal internal resistance of λ=1 Nernst cell Ri,N for new sensors (operating and calibration point) (measured with AC f = 1...4 kHz) 300 Ω Max. current load of λ=1 Nernst cell Continuous AC (f = 1...4 kHz) for RI,N measurement ≤ 250 µA Recommended value for reference pumping current continuous = 20 µA Max. pumping current into pump cell (Ip) - for rich gas signal (λ≥0,65) - for lean gas signal (air) ≥ -9 mA ≤ 6 mA Isolation resistance (all values for new sensors in static air, heater off) - between housing and each heater- and sensor circuit connector pin at room temperature - between sensor signal circuit and heater circuit at 600°C hexagon temperature - between sensor signal pin APE and housing at 600°C hexagon temperature: ≥ 30 MΩ ≥ 1 MΩ ≥ 100 kΩ 1.3 1.4 ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 4 von/of 13 Datum/Date 14.6.2005 Heater supply Nominal voltage: 7.5 V Nominal heater power at 7.5 V heater supply at thermal equilibrium in air: approx. 7.5 W Nominal heater cold resistance at room temp. for new sensor, including cable and connector Minimum heater cold resistance at -40°C: 3.2 Ω 1.8 Ω When the heater is switched on, heater power must be limited as follows: 1.5 1.6 effective heater voltage VHeff [V] operating point reached // max. value 13Volt 13 V 8.5V heater power reduced during condensation water phase maximum ramp rate = 0.4V/s max. initial value 8.5V // application specific ← application specific → time after heater start Maximum permissible heat up rate with limited heater power to reduce the thermal stresses in the heat-up phase During the condensation water phase the heater power must be limited to rule out thermo shock damage of the sensor ceramic. Heater voltage during condensation water phase VH,eff ≤ 2 V Maximum permissible effective heater voltage VH,eff to reach the operating point - short time ≤ 30sec (200h cumulated time): - continuous: ≤ 13 V ≤ 12 V Maximum system supply voltage Vbatt,max ≤ 16.5 V Minimum system supply voltage at this system supply voltage the function of the sensor is given in typical applications. This must still be tested in the resp. application. ≥ 10.8 V Minimum frequency of heater voltage control - recommended value: ≥ 20 Hz ≥ 100 Hz Note: the use of the sensor with 24V power systems is not permissible except if a voltage converter system is used. Note: duty cycle = (VH,eff / Vbatt)2 ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 5 von/of 13 Datum/Date 14.6.2005 Application conditions Temperature measurements Temperature measurements are performed with a special sensor equipped with NiCrNi thermocouples, see sketch. Sensor Type "MABCD" has measurement points at the upper side of the PTFE formed hose (Tupperhose), the cable grom- met (Tgrommet), the hexagon of the sensor housing (Thexagon) and for the exhaust gas temperature (Texhaustgas). These sensors are available from Bosch. TExhaustgas TGrommet TUpperhose 2. 2.1 2.2 THexagon Operating temperatures Exhaust gas (TExhaustgas): Hexagon of the sensor housing (THexagon): Cable grommet (PTFE formed hose) - sensor side (TGrommet): - cable side (upperhose crimp, TUpperhose): ≤ 930°C ≤ 600°C ≤ 250°C ≤ 200°C ≤ 250°C ≤ 120°C ≤ 1030°C ≤ 680°C ≤ 280°C ≤ 230°C ≤ 280°C Cable and protective sleeve: 2.3 2.3.1 (max. 250 h accumulated over lifetime) Connector: Maximum temperatures Exhaust gas (TExhaustgas): 2.3.2 (max. 40 h accumulated over lifetime) Hexagon of the sensor housing (THexagon): Cable grommet (PTFE formed hose) - sensor side (TGrommet): - cable side (upperhose crimp, TUpperhose): Cable and protective sleeve: ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 6 von/of 13 Datum/Date 14.6.2005 2.4 2.5 2.6 2.7 Exhaust gas pressure (absolute pressure) - continuous: - short time, max. 250h cumulated over lifetime ≤ 4 bar ≤ 2.5 bar Notes: If the operating temperature ( 2.2) or the max. continuous exhaust gas pressure ( 2.4) is exceeded, the sensor accuracy might be limited during this time. Permissible vibrations Stochastic vibrations: (peak level) Sinusoidal vibrations: ≤ 1000 m/s2 ≤ 300 m/s2 Corrosion, humidity The lambda sensor has been developed and tested for use in automotive vehi- cles, e.g. - damp heat cycling acc. to IEC 68-2-30 test Db (21 days, 40°C) - salt mist test acc. to IEC 68-2-11 test Ka, test time 288 h - temperature cycling test acc. to IEC 68-2-14 test Na, 250 cycles -40°C / 130°C - sulfur dioxide test with general condensation of moisture acc. to DIN EN ISO 6988, 6 cycles of 24h - submergence test IPx7 acc. to IEC 529 Permissible fuel additives In accordance with DIN EN228 for commercially available unleaded fuel or EN590 for diesel fuel. Contamination by other fuels, additives or oil consumption must be deter- mined by the customer by the way of adequate large-scale tests. ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 7 von/of 13 Datum/Date 14.6.2005 3. 3.1 Functional values All data must be regarded as nominal values, measured under the following conditions: The sensor is operated with circuit as in section 1.1. The heater power is closed-loop controlled, so that the nominal sensor internal resistance is reached. The measurement is done in a lab test bench at pgas=1013hPa. Changes in the test gas composition, especially of the H2-concentration, will have an influence on the characteristics of the sensor. These influ- ences are stronger in rich gas than under lean gas conditions. Nominal characteristic line IP meas / mA 3,000 2,500 2,000 1,500 1,000 0,500 0,000 0 -0,500 IP meas / mA gas: O 2 in N 2 calibration point 5 10 15 20 25 O2-concentration xO2 / % 1,500 1,000 0,500 0,000 0,70 -0,500 -1,000 -1,500 -2,000 0,80 0,90 1,00 1,1 1,20 1,30 1,40 1,50 1,60 1,70 1,80 1,90 2,00 2,10 2,20 2,30 2,50 2,40 λ lean gas: O 2 in N2 λ = (xO2 / 3 +1) / (1-4.77*xO2 ) for H/C=2 rich gas mixture of synthetic gas 9%CO, 7%H2, 7%CO2 in N2 O2-conc. xO2/% λ-value Ip,meas/mA 3.0 6.0 8.29 12.0 20.95 0.65 0.70 0.80 0.90 1.016 1.18 1.43 1.70 2.42 air -2.22 -1.82 -1.11 -0.50 0.00 0.33 0.67 0.94 1.38 2.54 ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

Technical Product Information Y 258 E00 015e Seite/Page 8 von/of 13 Datum/Date 14.6.2005 3.2 3.3 Time to activity (light-off time) Guide value for the time to activity after switching on the sensor heater (“light-off time”) ≤ 10 s Pressure dependency of the sensor signal A change of the exhaust gas pressure leads to a deviation of the sensor signal, which can be approximately described as follows: ∆Ip/Ip(1013 hPa) 25,0% 20,0% 15,0% 10,0% 5,0% 0,0% -5,0% -10,0% -15,0% -20,0% -25,0% 0,5 0,7 0,9 1,1 lambda > 1 lambda < 1 1,9 2,1 2,3 2,5 1,5 1,7 1,3 absolute pressure Absolut-Druck in [bar] Temperature dependency of the sensor signal and the internal resistance of the Nernst-cell Ri,N A temperature change of the sensor ceramic gives a deviation of the sensor output signal of approx. ∆IP,meas/IP,meas = 4%/100°C The temperature is known by measuring the internal resistance of the Nernst cell RI,N and the following curve: 1000 100 operating point RI,N = 300Ω, Tceramic = 780°C m h O / I N R e c n a t s i s e r l l e c t s n r e N 10 600 700 800 900 1000 1100 1200 Tceramic / °C 3.4 ©Alle Rechte bei Robert Bosch GmbH, auch für den Fall von Schutzrechtsanmeldungen. Jede Verfügungsbefugnis, wie Kopier- und Weitergaberecht, bei uns. ©Robert Bosch GmbH reserves all rights even in the event of industrial property.We reserve all rights of disposal such as copying and passing on to third parties

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