Innovate Motorsports ST-12 User Manual

Page 13

background image


This shows the analog output voltages versus Lambda for one of the two analog outputs. The graph
display is automatically scaled to the selected voltages. For each output you can specify a minimum and
maximum lambda value and the associated voltages. Below the minimum and above the maximum
lambda values the output voltages stay constant at the associated programmed voltage.
By selecting the ‘use Air-Fuel-Ratio’ button you can program the curve by AFR instead of
Lambda. This does not change the programming, only the representation of the data. When
programming by AFR the LM Programmer converts the number to Lambda before programming
the LC-1ST.

Click the Program button to download the new data into the LC-1ST.

As factory programmed the first output simulates a typical narrow band oxygen sensor. The second
output is programmed to output between 0 V for an AFR of 7.35 (gasoline) and 5.0V for an AFR of 22.39.
Other curves of course are easily programmable

4.6.4 Advanced output programming

The normal state of the analog outputs is to update the outputs every time the LC-1ST takes a new
measurement. The LC-1ST is fast enough to distinguish individual pockets of exhaust gas. For many
applications this will be too fast. The advanced programming allows to set the analog out update speed.

Press the “Advanced button” to set the advanced analog out settings. The following dialog box will

When setting the LC-1ST to the slower response speed settings the measured mixture data will be
averaged over the response time setting before being output.

You can also specify what output voltage is visible on the analog outputs during warm-up of the sensor
and during error conditions.

The ‘High Impedance’ setting allows to specify that the analog outputs do not drive the output during
warm-up or error condition. They will be free floating. This is important for more closely simulating a
narrow band sensor. Many EFI systems monitor the impedance of a narrow band sensor during engine
warm-up to determine sensor readiness. A narrow band sensor that’s too cold will have a high