Bosch Lambda Sensor LSU 4.9
Technical Datasheet
Overview
The Bosch Lambda Sensor LSU 4.9 is a planar ZrO2 dual cell limiting current sensor with an integrated heater, designed to measure the proportion of oxygen in automotive exhaust gases for gasoline or Diesel engines. Its monotonic output signal across the lambda range of 0.65 to air makes it a versatile sensor for lambda 1 measurements and other lambda ranges. The sensor features a robust design and high Bosch production quality. It operates in conjunction with a special LSU-IC, commonly found in Bosch Motorsport ECUs and lambda control units like LT4.
Key Features
- Application: lambda 0.65 to ∞
- Wide band measurement
- Exhaust gas temperature range (max.) for short time: ≤ 1,030°C
- Max. Hexagon temperature: 600°C
Technical Specifications
Operating Conditions
| Parameter | Value |
|---|---|
| Exhaust gas temperature range (operating) | < 930°C |
| Exhaust gas temperature range (max.) for short time | < 1,030°C |
| Hexagon temperature | < 600°C |
| Wire and protective sleeve temperature | < 250°C |
| Connector temperature | < 140°C |
| Storage temperature range | -40 to 100°C |
| Max. vibration (stochastic peak level) | 300 m/s² |
Variations
LSU 4.9 with automotive connector
| Parameter | Value |
|---|---|
| Connector | 1 928 404 687 |
| Mating connector | D 261 205 356-01 |
| Wire length L | 95.0 cm |
LSU 4.9 with motorsport connector
| Parameter | Value |
|---|---|
| Connector | AS 6-07-35PN |
| Mating connector | AS 0-07-35SN |
| Wire length L | 20.0 to 90.0 cm |
Mechanical Data
| Parameter | Value |
|---|---|
| Weight w/o wire | 120 g |
| Thread | M18x1.5 |
| Wrench size | 22 mm |
| Tightening torque | 40 to 60 Nm |
Electrical Data
| Parameter | Value |
|---|---|
| Power supply H+ nominal | 7.5 V |
| System supply voltage | 10.8 V to 16.5 V |
| Heater power steady state | 7.5 W |
| Heater control frequency | > 100 Hz |
| Nominal resistance of Nernst cell | 300 Ohm |
| Max current load for Nernst cell | 250 µA |
Characteristic
Signal Output
| Parameter | Value |
|---|---|
| Signal output | Iₚ meas |
| Accuracy at lambda 0.8 | 0.80 ± 0.01 |
| Accuracy at lambda 1 | 1.016 ± 0.007 |
| Accuracy at lambda 1.7 | 1.70 ± 0.05 |
Current vs. Lambda Data
Note: U<0xE2><0x82><0x90> is not an output signal of the lambda sensor, but the output of the evaluation circuit. Only Iₚ correlates with the oxygen content of the exhaust gas. Amplification factor v=17 is typically used for lean applications (lambda>1), amplification factor v=8 is typically used for rich applications (lambda<1).
| Iₚ [mA] | lambda | U<0xE2><0x82><0x90> [V], v=17 | U<0xE2><0x82><0x90> [V], v=8 |
|---|---|---|---|
| -2.000 | 0.650 | 0.192 | 0.510 |
| -1.602 | 0.700 | 0.525 | 0.707 |
| -1.243 | 0.750 | 0.658 | 0.884 |
| -0.927 | 0.800 | 0.814 | 1.041 |
| -0.800 | 0.822 | 0.658 | 1.104 |
| -0.652 | 0.850 | 0.814 | 1.177 |
| -0.405 | 0.900 | 1.074 | 1.299 |
| -0.183 | 0.950 | 1.307 | 1.409 |
| -0.106 | 0.970 | 1.388 | 1.448 |
| -0.040 | 0.990 | 1.458 | 1.480 |
| 0 | 1.003 | 1.500 | 1.500 |
| 0.015 | 1.010 | 1.515 | 1.507 |
| 0.097 | 1.050 | 1.602 | 1.548 |
| 0.193 | 1.100 | 1.703 | 1.596 |
| 0.250 | 1.132 | 1.763 | 1.624 |
| Iₚ [mA] | lambda | U<0xE2><0x82><0x90> [V], v=17 | U<0xE2><0x82><0x90> [V], v=8 |
|---|---|---|---|
| 0.329 | 1.179 | 1.846 | 1.663 |
| 0.671 | 1.429 | 2.206 | 1.832 |
| 0.938 | 1.701 | 2.487 | 1.964 |
| 1.150 | 1.990 | 2.710 | 2.069 |
| 1.385 | 2.434 | 2.958 | 2.186 |
| 1.700 | 3.413 | 3.289 | 2.342 |
| 2.000 | 5.391 | 3.605 | 2.490 |
| 2.150 | 7.506 | 3.762 | 2.565 |
| 2.250 | 10.119 | 3.868 | 2.614 |
Heater Strategy
The heater strategy involves applying an effective heater voltage (U<0xE1><0xB5><0xBD><0xE1><0xB5><0x93><0xE1><0xB5><0x93>) that is initially high (e.g., 13V) to reduce heater power during condensation (water phase). The voltage is then reduced to an operating point (e.g., 8.5V) after a certain time. A maximum ramp rate of 0.4V/s is specified. The process is application-specific.
Connectors and Wires
| Pin | Function |
|---|---|
| Connector | Please see variations |
| Mating connector | Please see variations |
| Sleeve | Fiber glass / silicone coated |
| Pin 1 | Pump current APE / IP |
| Pin 2 | Virtual ground IPN / VM |
| Pin 3 | Heater voltage H- / Uh- |
| Pin 4 | Heater voltage H+ / Uh+ |
| Pin 5 | Trim resistor RT / IA |
| Pin 6 | Nernst voltage UN / RE |
| Wire length | Please see variations |
Various motorsport and automotive connectors are available on request.
Installation Notes
- The sensor must operate with a special LSU-IC (e.g., in Bosch Motorsport ECUs and LT4 units). More information is available on the Bosch Motorsport homepage under Accessories/Expansion Modules.
- Install the sensor at a point that measures a representative exhaust-gas mixture and does not exceed the maximum permissible temperature.
- Install at a point where the gas is as hot as possible.
- Observe the maximum permissible temperature.
- Install the sensor vertically with the wire upwards, if possible.
- Avoid fitting the sensor near the exhaust pipe outlet to prevent outside air influence.
- Ensure the exhaust-gas passage opposite the sensor is free of leaks to prevent leak-air effects.
- Protect the sensor against condensation water.
- The sensor must not be painted or treated with wax. Use only the recommended grease for lubricating the thread.
- Further application hints can be found in the offer drawing on the Bosch Motorsport homepage.
Dimensions
Diagram shows:
- Outer diameter: Ø22.6 mm
- Thread: M18x1.5 (6e)
- Length of weld seam: 15 mm (max. Ø 16 mm on laser weld)
- Hexagon size for laser weld: SW 22-0.33 / HEX 22-0.3
- Sensor body length: 27.8 ± 0.4 mm
- Overall length (including connector housing): 57 ± 4 mm
- Connector housing diameter: Ø 17.6 mm
- Distance from weld to end of connector: 97 ± 8 mm
Mounting Recommendation
Recommended design of the mating thread in the exhaust pipe:
- Hexagon > 600°C or TGas > 930°C
- Thread specification: M 18 x 1.5
- Flange diameter: Ø 25 mm
- Inner diameter: Ø 18.5 mm
- Tolerances: 0.1 / 0.2 Rz30
- Depth: 3 mm (min. 10.5 mm)
Safety Note
The sensor is not intended for safety-related applications without appropriate measures for signal validation within the application system.
Ordering Information
Lambda Sensor LSU 4.9 with automotive connector
Order number: 0 258 017 025
Lambda Sensor LSU 4.9 with motorsport connector
Order number: B 261 209 358-03
Global Representation
Europe
Bosch Engineering GmbH Motorsport
Robert-Bosch-Allee 1
74232 Abstatt
Germany
Tel.: +49 7062 911 9101
Fax: +49 7062 911 79104
motorsport@bosch.com
www.bosch-motorsport.de
North America
Bosch Engineering North America Motorsport
38000 Hills Tech Drive
Farmington Hills, MI 483
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