Q: How do i set user scalars?

GEMS engine calibration software

Moderators: R!C0, JonMan, RickS

Locked
R!C0
Site Admin
Site Admin
Posts: 229
Joined: Thu May 10, 2007 1:21 pm

Q: How do i set user scalars?

Post by R!C0 » Mon Jan 21, 2008 3:57 pm

A: Example:

This will allow GWv3 user interface and associated logging tools to show Engine Load in kPa.

Using a DELCO 20-315 absolute pressure sensor.

Sensor Range 20 to 315 kPa

Output Range (volts) = Us ((P/437.5) - 0.0143)

Since Us is a nominal 5.0 Volts.

A signal of 0volts = 20 kPa A signal of 5volts = 315 kPa

This range is rescaled by MAP min and MAP max options.

So if MAP min = 0.06V and MAP max = 4.90V

The range of load will be: min = 20 + (295kPa × (0.06/5.00) = 23.4 kPa max = 20 + (295kPa × (4.90/5.00) = 309.1 kPa

For an ECU with an underlying (default) range of load 0-100%

Set Load scalar = (309-23)/100 = 2.86 And Load offset = 23.3 Then configuer units from top tool bar to kPa

Set Load Error scalar = 2.86

Note since Boost Error is a relative measure it has no offset.

Locked