Digital servo outputs

[MrNickB]

Hi,

I've got a ZF 5HP24 sitting in my garage, and am pleased to find the Megashift available - I was considering making something similar myself, but am always keen to use others good work! The gearbox is on a 4.4L BMW engine, and this will eventually end up in a single seater track style car.

I want to use the boxin a fully manual paddle-shift mode, so R-N-1-2-3-4-5. The gear selector lever is mechanical, so I intended to use a large model servo (PWM, 350Hz, 1-2ms) to move this lever.

Is there existing Megashift code that would help with this, or would I need to code the shift and control of the servo? I'd like to make it a module that would be compatible with future Megashift code.

Thanks in advance!

Nick

[Bernard Fife]

Nick,

For MShift, the lever is used as an input. It set the highest gear that is allowed (in a forward gear) or PNR. So the code doesn't control the shift lever, the shift lever controls the code.

However, there is a full manual mode in MShift, in forward gears it directs the solenoids to the chosen gear regardless of the shift lever position (in all forward gears up to and including the current gear lever position). So if the shift lever is in 4th, you can then manually select 1st, 2nd, 3rd, or 4th (assuming the trans is truly electronically controlled by two or more shift solenoids).

If you are saying that the trans is not controlled by solenoids, only by the shift lever, than this is more difficult. If the lever can be controlled and placed in each gear uniquely by some combination of the up to 9 shift solenoids outputs (or spare outputs), then it might be possible, but would require a lot of thinking to implement.

Lance.