[Diy_efi] WB Lambda Meter

[Klaus Allmendinger]

Hi everybody,

My company is currently developing a new wide-band Lambda Meter based on
the NTK and Bosch Sensors using a new measurement principle. This principle
uses proprietary algorithms for calculating Lambda from the sensor data
without resorting to calibration resistors and such. I want to use this
forum to see what the interrest level in this community is for such a
device. Here are the target specs:

1. Precise heater control (Htr resistance controlled to +- 10 milliOhm).

2. Fast, temperature gradient controlled light-off time ( < 20sec)
depending on sensor.

3. 32-character LCD display for AFR, Lambda and Lambda bar-graph.

4. Automatic error detection and display for sensor and connection faults. 

5. Digital Signal Processing for Lambda Signal sampled and processed at
128 times Sensor response speed. Overswing compensated and controlled using
digital filtering algorithms.

6. Self compensating for exhaust temperature, pressure (within resonable
limits) and (within reason) sensor aging. Target error < 0.5% lambda.

6. Self calibrating in operation.

7. Linear Lambda output as voltage in addition to display. Programmable
Lambda/Volt ratio to fit user's remote analog lambda display.

8. Simulated HEGO output with programmable switchpoint.

9. Inputs for up to 5 additional analog sensor signals (like TPS, MAP/MAF,
CT ...)

10. Stores up to 1 hr of sensor data (for all sensor inputs + lambda
concurrently) internally in non-volatile memory (when sensors are sampled
at 100ms). If less sensors are used the sampling time decreases
proportionally.

12. Serial Port for programming and data download. Downloaded data
formatted into Excel compatible file and time-stamped (Windows download
software included).

13. Small hand-held device.

14. Price target < $300.- including sensor.

A cheaper module is also planned that does not include storage and LCD
display but allows the user to program the HEGO output depending on other
sensor data using downloadable maps.


Regards,
Klaus



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