[Diy_efi] WB Lambda Meter

[Geddes, Brian J]

One feature you will want to add in order to expand your customer base =
is a 0-5 volt output.  The AEM EMS is rapidly gaining popularity and can =
be setup to use WB readings from a 0-5 volt signal.  The output need not =
be linear, as long as you provide a voltage-to-AF chart.

- Brian

> -----Original Message-----
> From: Klaus Allmendinger [mailto:klaus at innovate-tech.com]
> Sent: Thursday, November 14, 2002 3:24 PM
> To: diy_efi at diy-efi.org
> Subject: [Diy_efi] WB Lambda Meter
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> Hi everybody,
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> My company is currently developing a new wide-band Lambda=20
> Meter based on
> the NTK and Bosch Sensors using a new measurement principle.=20
> This principle
> uses proprietary algorithms for calculating Lambda from the=20
> sensor data
> without resorting to calibration resistors and such. I want=20
> to use this
> forum to see what the interrest level in this community is for such a
> device. Here are the target specs:
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> 1. Precise heater control (Htr resistance controlled to +- 10=20
> milliOhm).
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> 2. Fast, temperature gradient controlled light-off time ( < 20sec)
> depending on sensor.
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> 3. 32-character LCD display for AFR, Lambda and Lambda bar-graph.
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> 4. Automatic error detection and display for sensor and=20
> connection faults.=20
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> 5. Digital Signal Processing for Lambda Signal sampled and=20
> processed at
> 128 times Sensor response speed. Overswing compensated and=20
> controlled using
> digital filtering algorithms.
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> 6. Self compensating for exhaust temperature, pressure=20
> (within resonable
> limits) and (within reason) sensor aging. Target error < 0.5% lambda.
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> 6. Self calibrating in operation.
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> 7. Linear Lambda output as voltage in addition to display.=20
> Programmable
> Lambda/Volt ratio to fit user's remote analog lambda display.
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> 8. Simulated HEGO output with programmable switchpoint.
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> 9. Inputs for up to 5 additional analog sensor signals (like=20
> TPS, MAP/MAF,
> CT ...)
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> 10. Stores up to 1 hr of sensor data (for all sensor inputs + lambda
> concurrently) internally in non-volatile memory (when sensors=20
> are sampled
> at 100ms). If less sensors are used the sampling time decreases
> proportionally.
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> 12. Serial Port for programming and data download. Downloaded data
> formatted into Excel compatible file and time-stamped=20
> (Windows download
> software included).
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> 13. Small hand-held device.
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> 14. Price target < $300.- including sensor.
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> A cheaper module is also planned that does not include storage and LCD
> display but allows the user to program the HEGO output=20
> depending on other
> sensor data using downloadable maps.
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> Regards,
> Klaus
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> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> http://www.diy-efi.org/mailman/listinfo/diy_efi
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