Link G4 Plus Software Tutorial: Open Loop Boost Control
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Open Loop Boost Control
03.44
| 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. |
| 03:25 | Excessive boost pressure can quickly damage an engine so it's recommended to take your time setting up boost control and always make sure you have a MAP limit configured to prevent accidental overboost. |
