Link G4 Plus Software Tutorial: Gear Cut Control
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Gear Cut Control
03.32
| 00:01 | - Gear cut control can be used in motorsport applications to provide clutchless shifting. |
| 00:06 | This can improve shift speed and consistency. |
| 00:08 | To allow for gear cut control, we need a digital input wired up to the ECU and configured as gear cut. |
| 00:15 | This could come from a micro switch or a digital strain gauge in the gear lever. |
| 00:20 | To access the gear cut control we need to open the ECU settings and click on motorsport and then gear cut control. |
| 00:28 | If we click on gear cut control this will open the main setup screen. |
| 00:33 | Before we go too far we need to turn the mode to on. |
| 00:37 | This will give us access to the remaining parameters. |
| 00:41 | First we need to configure the channel used to activate the gear cut control. |
| 00:45 | This is the digital input connected to our gear lever or micro switch. |
| 00:50 | Cut mode can be set to timed or not timed. |
| 00:54 | In timed mode, the cut length will be based on the gear cut period table. |
| 00:59 | If you choose not timed, the gear cut will remain active as long as the digital input is in the on position. |
| 01:07 | Maximum cut time defines the maximum cut length. |
| 01:11 | This acts as a limit on the cut length in case the gear cut signal remains active. |
| 01:17 | Next we have RPM and throttle position activation points. |
| 01:21 | These can be used to prevent a gear cut occurring at idle or low load when we don't want it. |
| 01:27 | Cut level defines the amount of ignition cut applied as a percentage. |
| 01:32 | This number needs to be set high enough to allow the gear change to occur. |
| 01:36 | Typically this will be between 90 and 100%. |
| 01:40 | Cut level exit rate defines how quickly engine power is reintroduced. |
| 01:45 | This can be used to take some of the shock out of the gear shift. |
| 01:49 | Higher numbers will reintroduce engine power faster and a number of 100 effectively removes the cut instantly. |
| 01:58 | In some situations you may also want to retard the ignition timing when the gear cut is active to reduce engine torque. |
| 02:05 | Typically this would be set between zero and -20°. |
| 02:11 | Ignition retard exit rate defines how fast the ignition retard is removed. |
| 02:16 | Again, this can be used to smooth the gear cut. |
| 02:19 | If it's set to zero, retard is removed instantly. |
| 02:24 | Fuel enrichment allows a percentage of additional fuel to be injected during the gear cut. |
| 02:30 | This can be used to help stabilise the air/fuel ratio as the gear cut is removed. |
| 02:35 | This works in conjunction with the fuel trim exit rate. |
| 02:38 | This is expressed as percentage of fuel trim that is removed per engine cycle. |
| 02:44 | Typical numbers here would be between 5-25%. |
| 02:49 | If you selected the timed cut mode, you will also need to adjust the gear cut period table. |
| 02:55 | This table gives a gear cut period in seconds for each gear. |
| 02:59 | This can be helpful if some shifts in the gearbox take longer than others. |
| 03:04 | If you're not using gear detection, just set every cell to the same value. |
| 03:10 | Setting the gear cut period needs to be done carefully as a delayed cut which is too short can do serious damage to your gearbox. |
| 03:18 | It's always preferable to start with a delay that is too long and gradually shorten it. |
| 03:23 | If in doubt about the cut length, talk to your gearbox supplied for a recommendation. |
