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Dual channel wideband lambda controller based on 2x CJ125 and AT90CAN128

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Dual channel wideband oxygen controller

Development status

  • Hardware: working in progress, check hardware/V0.0.1 for actual status
  • Software: not started yet

Dual WBO controller based on

  • Microchip AT90CAN128
  • 2x Bosch CJ125 wideband lambda controller
  • NXP TJA1050T high speed can transceiver
  • Infineon TLE42754D LDO 5v and 450mA
  • Analog Devices AD5337 8-bit DAC
  • Analog Devices ADR02 5v and 10mA precision reference (0.1%) for TLS115
  • Infineon TLS115B0EJ voltage tracker for analog part, provides 5v and 150mA
  • ...

Features

  • supports LSU4.9 probes only
  • Automotive grade components
  • 2x LSU 4.9 connector (TE 1813139-1)
  • 4 layer PCB
  • integrated with TunerStudio

Inputs

  • 2x LSU4.9 probes
  • CAN HS with up to 1mbit/s
  • UART for configuration
  • UBat input for activation the controller

Outputs

  • dual analog output, either as 0..5V for Lambda 0.65 to 1.35 OR narrow band emulation
  • CAN output (AEM X-Series protocol) for both channels and debug messages

Bosch CJ125 (LQFP32 package) part numbers

Bosch part number
30615
40103
30522

A couple of CJ125 ICs

alt text

Suitable Bosch lambda probes

Basically, the Bosch probes whose numbers start with 0 258 017 will fit, also Bosch 0 281 004.
Bosch numbers beginning with 0 258 007 are LSU 4.2 probes and will not fit.

Bosch number Length overall Comment
0 258 017 012 1060mm
0 258 017 025 1000mm Bosch motorsport part
0 258 017 029 620mm grey, used by BMW after 09/2006 (1178 7539124)
0 258 017 038 340mm grey, used by BMW (11787537984)
0 258 017 092 950mm black, used by BMW (1178 7540167)
0 258 017 126 680mm black, used by BMW after 09/2006 (1178 7561410)
0 281 004 028 540mm
0 281 004 150 1215mm
0 281 004 184 1000mm
...

LSU4.9 probe pinout

Pin# Color Description Symbol
1 red Pump current APE IP
2 yellow Virtual ground IPN VM
3 white Heater voltage H- Uh-
4 grey Heater voltaget H+ Uh+
5 green Trim Resistor RT IA
6 black Nernst voltage UN RE

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Dual channel wideband lambda controller based on 2x CJ125 and AT90CAN128

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