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Link G4 Plus Software Tutorial: Open Loop Boost Control

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Open Loop Boost Control


00:00 - The G4+ offers some advanced options which provide very accurate boost control in turbocharged engines.
00:07 We're going to look at the different control strategies and what you need to do to set them up.
00:13 First, we need to set an auxiliary output to control the wastegate solenoid.
00:17 This is the solenoid the ECU will use to control boost.
00:21 We do this by selecting an unused auxiliary output and setting it as boost solenoid.
00:26 You can see we now have the option of setting the solenoid frequency and this is quite important.
00:33 We need to choose a frequency that the solenoid will work comfortably at and this is dependent on the solenoid.
00:40 Most popular solenoids tend to work best in the 15-30 hertz range so we're going to choose 20 hertz.
00:48 Now we need to set up the boost control parameters.
00:51 We can do this by accessing the ECU settings menu and choosing boost setup from the boost control menu.
00:58 Here we need to decide if we want to use open loop or closed loop boost control.
01:03 Open loop is simpler and easier to set up but if the boost level isn't exactly what you want, the ECU won't do anything to try and correct this.
01:12 In this module, we're going to look at how to configure an open loop system.
01:17 There are still a few more parameters to adjust before we get to adjust the boost.
01:22 RPM activation and MAP activation are lock out points below which the boost control system won't operate.
01:28 These make sure the boost solenoid won't be working when you don't want it.
01:33 Deactivation timeout is only relevant to closed loop control and will have no effect in open loop mode.
01:41 If we go back into the ECU settings menu and click on boost control, the next option we have is multiple boost tables.
01:48 This lets us configure up to three separate boost tables which can be controlled by the driver.
01:54 For simplicity we'll just set up a single boost table.
01:59 Next in the boost control menu we have wastegate and this is where we find the tables to actually control boost pressure.
02:06 First of all we have compensation tables for engine temperature, intake temperature and gear.
02:12 These tables let you adjust the boost dependant on these parameters to ensure safety.
02:17 To start with, it's a good idea to make sure these compensation tables are all zeroed so they won't influence your boost tuning.
02:25 If you want to use these compensations, set them up once the main boost control is configured.
02:31 Lastly we have the wastegate duty cycle one table which is where we can directly enter wastegate duty cycles.
02:38 By default, this is a 3D table with RPM on the X axis and throttle position on the Y axis.
02:44 As usual, these axes are adjustable and you can use any inputs you want.
02:50 Altering numbers in the wastegate duty cycle map will adjust the boost level.
02:54 Start by zeroing all the numbers in the table and ensuring your base boost level is where you need it to be.
03:01 If the boost is already exceeding your target then the boost control tables won't be able to help you.
03:08 In this case you'll need to make mechanical changes to the wastegate or turbo system.
03:14 When tuning the wastegate duty cycle map, make small changes to the numbers and start with less boost than you want while slowly increasing towards your target boost level.