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Boost Control: How to Use a Multi Position Rotary Switch

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How to Use a Multi Position Rotary Switch

03.23

00:00 - Now we're going to just look at how we can use the input from a driver rotary switch to help define our boost control set point, our boost control aim.
00:11 And we can do that through our Initial Setup 2 workbook, and we are on our boost control worksheet here.
00:19 And you can see that we have Driver Engine Boost Limit Switch Index.
00:23 What we can do is select the switch that we're using, and in this case we're using Driver Rotary Switch 1.
00:30 Now once we've got that set up, we can then define our engine boost limit.
00:36 Now again by default this is set up as a single parameter and it's set to 100%, so it isn't doing anything.
00:43 If we press the A-key though and we can then enable our engine speed, or our driver engine boost limit switch axis.
00:54 And I'm going to just enable the driver engine boost limit switch axis for the moment, and you can see it automatically populates with the different positions for that switch.
01:05 Now as we move the switch you'll see the little yellow triangle on the side move, and we can move through that particular table, and we can make adjustments to our boost limit based on that.
01:20 Now remember that the way that these boost limits work is that it is a percentage of the difference between our boost activate value, which is up here, in this case 10 kPa g, and the value from our boost aim main table.
01:38 So we're not actually defining a specific boost target from this table.
01:43 So that's one thing that's important to understand.
01:46 What we're doing is we're adjusting the aim position based on a percentage of the boost aim main, minus the boost activate value.
01:57 So a way we could use this table would be to leave our values at the far end of the scale, say position nine at 100%.
02:07 And we could gradually reduce them at the lower values, so let's say we may only want 50% at position zero.
02:17 We could then highlight that table, press I and interpolate them.
02:20 And what that's going to do is, in position nine it's going to give us our full boost aim main value, and gradually as we move to the left down to position zero it's going to give us our minimum boost switch, in this case is 50% of our boost aim main, minus our boost activate position.
02:40 It's also important to remember that if there is a problem with the input from the rotary switch for any reason, it will go into the default settings.
02:50 So we may also want to reduce this, so that if there is a problem we end up with our minimum boost.
02:56 Alright so from there you can make changes to those boost aims, boost limits, based on whatever you're trying to achieve with your rotary position switch.
03:06 Now that brings us to the end of our M1 worked example.