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Mdc2 functionality, Mode selection, Lock calculation – MoTeC MDC2 User Manual

Page 4: Motec mdc2 2 functionality

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MoTeC MDC2

2

Functionality

MDC2 Functionality

Mode selection

There are six user selectable control modes, four of which are user configurable. The control modes can be
selected using the ACD toggle switch on the steering wheel.

The current mode is indicated in the top line of the dash centre display. Optionally, three mode lights (SNOW,
TARMAC and GRAVEL) can be wired directly to the MDC2 if the dash display is removed.

Control Mode

Dash Display Top Line

Lights (optional)

0% Lock

Blank

None

1 (Snow)

SNOW

2 (Gravel)

GRAVEL

3 (Tar)

TARMAC

4 (Gravel/Tar)

/

(alternating)

GRAVEL + TARMAC

Constant Lock

(flashing)

SNOW + GRAVEL + TARMAC

Note:

If the mode has not changed for one minute then the current mode is saved and will be used next time the

MDC2 is powered on.

Lock Calculation

Lock percentage applied to the centre diff is determined primarily by the vehicle speed, throttle position or engine
efficiency point (from a MoTeC ECU), and front to rear wheel slip.

Each of the four user modes are configured with an acceleration table, a braking table, a desired slip table and
slip control parameters. Slip control may be disabled if not required.

The lock percentage for a user mode is determined according to the following strategy:

Brake

ON

OFF

Desired

Slip table

(kph)

% lock

Vehicle
Speed

Throttle
Position or
Manifold
Pressure

Handbrake

ON

OFF

0%

Lock

Front & Rear
Speed

Slip

control

params

Slip

Calculation

(% lock)

+

MIN

100%

Lock

Accel

table

(% lock)

Brake

table

(% lock)