Boost Control: Configuring a Multi Position Rotary Switch
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Configuring a Multi Position Rotary Switch
04.30
| 00:00 | - With the MoTeC M1 range of ECUs, we have the ability to input either a two-position on/off switch or a multi-position potentiometer to control many of the functions and we are going to have a look right now at how we can set one of these up. |
| 00:16 | So what I've done is, I've wired in a nine-position rotary switch into an analogue voltage input and we're going to look at how we can set that up in the M1 tuning software. |
| 00:28 | So, first of all, what we want to do is go to the vehicle folder, vehicle workbook I should say, and you can see we've got worksheet number four is driver switch and this is where we're going to configure this particular function. |
| 00:42 | So we have two options here. |
| 00:44 | We have our switches which are a on/off two-position switch. |
| 00:48 | So we could use this, for example, for tuning a function such as traction control on or off. |
| 00:54 | What we're going to look at though is our rotary multi-position switches. |
| 00:58 | To be honest though, the configuration is relatively similar between the two. |
| 01:03 | Obviously we just don't have as many positions. |
| 01:05 | So we'll just expand out the tree here for our rotary switch and we want to start by defining a resource that this particular input is on and in this case, we have wired this up to analogue voltage input 12. |
| 01:21 | So we want to select that and you'll see at the top the bar goes red and tells us that we need to perform a reset, which we can do by pressing down the Ctrl and S key to save or store that particular calibration. |
| 01:36 | So, once that resets, then we can look at the rest of the setup. |
| 01:40 | At the moment, you'll see that straight away we have a voltage reading coming in from our switch. |
| 01:46 | That suggests that everything's working. |
| 01:48 | If you want, if you've got a lot of noise on that signal, you can filter it. |
| 01:53 | Although for this particular input, it's really not necessary. |
| 01:56 | We're looking at something that's moving quite slowly and also we've got a large tolerance between our different positions. |
| 02:04 | Now if we move up, we've got our diagnostics, which gives a low and a high value for the range of voltages that the ECU is expecting to see from the switch. |
| 02:17 | So we want to make sure that both the low and high voltages diagnostic areas are set outside of the normal range we'll expect from that switch. |
| 02:25 | And we've also got a delay, so it will have to go above or below those diagnostic values for 100ms before it's considered to be in fault. |
| 02:34 | At the moment, you can see the diagnostic is saying "tolerance" and what this means is, at the moment, the switch the ECU can't define the position of the switch. |
| 02:41 | And that's simply because, at the moment, all of the positions which you can see listed here, are all set to 50mV. |
| 02:49 | So what we want to do is, we want to grab our switch and put it in the first position, which is zero. |
| 02:55 | And then, we can simply use the Q calibrate key to read the value from the switch. |
| 03:01 | And you can see, when I press that, it reads in the current value, which is 284mV. |
| 03:06 | So what we can do is then just continue down through the list, moving to the next position on the switch, before pressing the Q key to automatically calibrate the input from the rotary switch. |
| 03:19 | So that's a pretty straightforward system and it's very quick and easy to calibrate. |
| 03:25 | Once we get down to the bottom, you can see that all of our different values have been entered. |
| 03:30 | Now it's worth just mentioning this tolerance. |
| 03:32 | The default value for the tolerance is 200mV. |
| 03:35 | So, what this means is, when we are within 200mV of the calibrated value, that is the position that the ECU will consider to be current. |
| 03:46 | So this just allows for some movement in the absolute voltage from the switch at any time. |
| 03:52 | And 200mV, that's the default value. |
| 03:55 | In this case, it works quite nicely. |
| 03:58 | Now if we look here, we can see our rotary position switch. |
| 04:02 | Our diagnostic is saying we're okay now; we're out of that tolerance diagnostic fault. |
| 04:08 | And you can see up here the current position, as I move the switch it's moving through all of the values. |
| 04:15 | So, that's how we can configure a switch, rotary switch, into the M1 ECU and now we can use that in our tuning to control our functions. |
| 04:26 | And, we'll look at that a little bit later. |
