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

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Dual_WBO

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 TJA1051T high speed can transceiver (Rohm BD41041FJ-CE2 can be used instead)
  • Analog Devices LTC2633 dual channel 10-bit I²C DAC
  • Infineon TLE42754D LDO 5v and 450mA
  • TI REF5050-Q1 5v and 10mA precision reference (0.05%) for TLS115
  • Infineon TLS115B0EJ voltage tracker for analog part, provides 5v and 150mA
  • ...

Features:

  • supports LSU4.9 probes only
  • Automotive grade components
  • Molex MX150 20-pin automotive sealed connector (348302001)
  • 2x LSU 4.9 connector (TE 1813139-1)
  • 4 layer PCB

Inputs:

  • 2x LSU4.9 probes
  • CAN high speed with 500kbit/s and extended IDs
  • TTL input for activation the controller

Outputs:

  • dual analog output, either as 0..4.096V for AFR 10..20 OR narrow band emulation
  • CAN output (AEM X-Series protocol) for both channels
  • CAN debug / diagnostic messages (pump current, battery voltage, heater power, ....)

Suitable Bosch lambda probes:

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

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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