Link G4 Plus Software Tutorial: Idle Ignition Control
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Idle Ignition Control
02.17
| 00:00 | - Getting really accurate idle speed control can be aided by using Link's idle ignition control function. |
| 00:06 | This uses the ignition timing as a kind of fine trim to the idle speed. |
| 00:11 | The concept works like this. |
| 00:13 | As ignition timing is retarded, engine torque is reduced and hence idle speed tends to drop. |
| 00:19 | If the ignition is advanced, engine torque increases and hence idle speed will also increase. |
| 00:25 | You can access the idle ignition control function by heading to the ECU settings menu and clicking on ignition and then idle ignition control. |
| 00:34 | To start with, we need to turn the function on. |
| 00:37 | The box will pop up asking if you want to clear the idle ignition table and set the default axis, click yes. |
| 00:43 | Next we have some lockouts which we can use to make sure the idle ignition function is only active when the engine is at idle. |
| 00:50 | Otherwise we may end up with some odd drivability problems. |
| 00:53 | Try to choose values for these lockouts that are just slightly above the normal manifold pressure and idle RPM. |
| 01:00 | If you have a speed sensor connected, you can also lock out the idle ignition control above a certain speed. |
| 01:06 | Lastly there is a lockout for throttle position. |
| 01:09 | It's important here to choose a throttle position that is close enough to zero that you'll be above it when the car's being driven but high enough to avoid any inconsistency in the TPS signal. |
| 01:20 | Normally a value of 0.5 - 1% will work well. |
| 01:24 | Once you've set the parameters, you need to set the idle ignition table. |
| 01:28 | We can access this through the ECU settings menu. |
| 01:31 | By default this table is configured as a 3D table with idle ignition error on the X axis and load on the Y axis. |
| 01:39 | For simplicity we're going to make it into a 2D table. |
| 01:44 | Idle error is the difference between the idle speed and the target. |
| 01:48 | The way the table works is that the idle error will be negative when the idle speed is above target and positive if the idle speed is below target. |
| 01:58 | We will usually fill this table out so the ignition timing is reduced as the idle error moves negative and add timing as the error moves positive. |
| 02:07 | This table works in conjunction with a well tuned idle speed control system and should not be relied on solely to control idle speed. |
