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Link G4 Plus Software Tutorial: Idle Ignition Control

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Idle Ignition Control


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.