linearitems
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linearitems [2010/02/27 06:44] twdorris |
linearitems [2011/07/17 12:25] dmertz Add method to calibrate LinWideband |
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| We have pre-defined a number of common sensor calibrations for you. These include things like the Innovate LC-1 wideband, the GM 3 and 3.3-bar boost sensors, the AEM boost sensors, etc., etc. A complete list can be found on our [[externalsensorlist|Supported Aftermarket Sensors]] page. | We have pre-defined a number of common sensor calibrations for you. These include things like the Innovate LC-1 wideband, the GM 3 and 3.3-bar boost sensors, the AEM boost sensors, etc., etc. A complete list can be found on our [[externalsensorlist|Supported Aftermarket Sensors]] page. | ||
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| ===== Defining your own ===== | ===== Defining your own ===== | ||
| - | We have also provided a few "generic" items that let you define your own linear sensor types. These include the **Linear boost** and **Linear wideband** items in the Connected sensor drop down list. | + | We have also provided a few "generic" items that let you define your own linear sensor types. These include the **Linear boost**, **Linear fuel pressure** and **Linear wideband** items in the Connected sensor drop down list. |
| When you select one of these generic items, you must tell the application about the sensor's mapping of volts to output value. You'll need to request this information from the sensor's manufacturer. | When you select one of these generic items, you must tell the application about the sensor's mapping of volts to output value. You'll need to request this information from the sensor's manufacturer. | ||
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| As you can see, the next step is pretty easy. You simply punch in two voltage-to-value pairs from the sensor manufacturer's documentation and you're done. | As you can see, the next step is pretty easy. You simply punch in two voltage-to-value pairs from the sensor manufacturer's documentation and you're done. | ||
| - | The LinWideband item works exactly the same except, of course, units are displayed as A/F ratio instead of pressure. | + | The LinWideband item works exactly the same except, of course, units are displayed as A/F ratio instead of pressure. However, some wideband units don't faithfully follow the characteristics shown in their documentation. If this is the case, you'll probably need to empirically determine the settings necessary to obtain agreement between the values displayed directly by the wideband unit and those displayed by ECMLink. Probably the simplest way do this is to add RawLinWideband to your displayed values (click the Raw value button on the Display Values dialog). Then lock the ECU in open-loop mode and force a stoichiometric measured (displayed by the wideband unit) A/F ratio (Lambda = 1.0, gasoline A/F ratio = 14.7:1). Observe the logged RawLinWideband voltage. Set Max volts to the observed value and set Max lambda to 1.0. (If you are using ECMLink's narrowband simulation, this observed voltage will also be NBO2 sim's WB switch point.) |
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| + | Next, determine a Min volts and min lambda point. Force a measured gasoline A/F ratio of 11.0:1 (lambda = 0.75). Observe the logged RawLinWideband voltage. Set Min volts to the observed value and set Min lambda to 0.75. Finish by restoring your normal closed-loop configuration and verify that the ECMLink displayed A/F ratio values match those displayed by the wideband unit. | ||
linearitems.txt · Last modified: 2024/03/15 11:16 (external edit)
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