Lambdatronic LT4

The Lambdatronic LT4 provides controlled pumping current to supply up to 4 Bosch lambda sensors, type LSU 4.2, LSU 4.9 or Mini-LSU 4.9. The lambda value, the sensor temperature and diagnostics are available via CAN and analog signal.

The LSU contains a Nernst and a pump cell. The lambda in the Nernst cell is controlled to lambda = 1.013 independent of the oxygen contents on the emission side, through a current through the pump cell. The current proportional output voltage of the IC is a measure of the lambda value.

The main feature and benefit of this unit is the combination of the Bosch well known lambda IC and a very compact box size with motorsport specification. Furthermore the analog signal output can be configured freely.

Features

  • Supply of up to 4 Bosch lambda sensors, type LSU 4.2, LSU 4.9 or Mini-LSU 4.9
  • Integrated voltage compensation for sensor heater

Functions

Application

Lambda 0.75 to 10.12

Compatible Bosch sensor type

LSU 4.2, LSU 4.9, Mini-LSU 4.9

Channels

4

Heater

Internal

Technical Specifications

Mechanical Data

Weight with wire

98 g

Sealing

100 % humidity

Mounting

Velcro

Size w/o wire (w*l*h)

54 x 59 x 13 mm

Operating temp. range (housing)

-20 to 85°C

Storage temp. range

-20 to 85°C

Max. vibration

Vibration Profile 1 (see Appendix or www.bosch-motorsport.com)

Electrical Data

Power supply US

(6.5) 10 to 14 V

Max power supply (1 min) US

Max. 26 V

Thermal dissipation loss

3 W at 14 V

Current Is

5 A

Current Is (Heating up)

26 A

Software

Configuration with Modas Sport

Included

Characteristic

Signal output 1

CAN

Signal output 2

4 x 0 to 5 V “analog”

CAN- baud rate

500 kbaud or 1 Mbaud

Signal resolution

2,5 * 10-4 lambda

Signal sampling rate

100 Hz

CAN refresh rate

100 Hz

Connectors and Wires

Connector

AS614-35PN

Connector loom

AS114-35SN

F 02U 000 365-01

Sleeve

Viton

Wire size

26

Wire length L

20 cm

Pin Assignment

Pin

Function

1

+ 12 V (Battery +)

2

+ 12 V (Battery +)

3

Ground (Battery -)

4

Ground (Battery -)

5

K-Line diagnostic connection

6

CAN1 + (high)

7

CAN1 - (low)

8

Analog out 1

9

Analog out 2

10

Analog out 3

11

Analog out 4

12

Reference GND for analog out

13

Shield

14

Pump current LSU 1 IP1

15

Virtual GND LSU 1 VM1

16

Heater PWM LSU 1 Uh-1

17

Heater (Batt +) LSU 1 Uh+1

18

Setup current LSU 1 IA1

19

Nernst voltage LSU 1 UN1

20

Pump current LSU 2 IP2

21

Virtual GND LSU 2 VM2

22

Heater PWM LSU 2 Uh-2

23

Heater (Batt. +) LSU 2 Uh+2

24

Setup current LSU 2 IA2

25

Nernst voltage LSU 2 UN2

26

Pump current LSU 3 IP3

27

Virtual GND LSU 3 VM3

28

Heater PWM LSU 3 Uh-3

29

Heater (Batt +) LSU 3 Uh+3

30

Setup current LSU 3 IA3

31

Nernst voltage LSU 3 UN3

32

Pump current LSU 4 IP4

33

Virtual GND LSU 4 VM4

34

Heater PWM LSU 4 Uh-4

35

Heater (Batt. +) LSU 4 Uh+4

36

Setup current LSU 4 IA4

37

Nernst voltage LSU 4 UN4

Communication

Communication link

K-Line / CAN

Installation Notes

Typical lifetime: max. 220 h / 2 years

For application with severe conditions and/or high volume, please contact your Bosch Motorsport counterpart in order to define the most appropriate validation program

The LT4 is designed to supply 4 Bosch lambda sensors, type LSU 4.2, LSU 4.9 or Mini-LSU 4.9

The LT4 is featured with voltage compensation for the heating profile

The unit can be connected to any CAN system (500 kbaud or 1 Mbaud) and analog measuring device.

To avoid signal errors, a cable length of maximum 1.5 m between sensor and box is recommended.

The unit is secure from miss-pinning.

The reference ground (GND_REF) has to be connected either to the measuring device or to the system ground.

A ground offset of 2 V (max.) between GND and GND_REF has not to be exceeded.

See the LT4 function sheet for software documentation (e.g. CAN protocol).

Please find further application hints in the offer drawing at our homepage.

Ordering Information

 

Lambdatronic LT4

 

Order number: F 01T A20 070-09

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