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SMT6 Developers Manual - Operating Modes

SMT6 DEVELOPERS MANUAL

Perfect Power Online Manuals.

 

Support for your SMT6 Unit.

OPERATING MODES

The SMT6 has various input and output signals, which are assigned to a specific function (operation) by a MODE specification. A wrong mode is indicated on the PC display.

 

The AIN to AOUT signal path is always assigned to the FUEL MAP, regardless of the operating mode.

 

 

The following modes can be specified :


MODE=1 Missing Tooth Operation
The pickup is from a multi-tooth wheel, with one or two teeth missing. The output signal can be advanced or retarded to a max. of 2 teeth.


MODE=10 Single Ignition Advance and Retard + Frequency Fuel
The ignition pickup is from a single sensor, magnetic or optical, which can be  advanced or retarded. The signal must be "uniform", and it must repeat every engine turn (or every two turns). Multiple "teeth" or trigger points per firing are allowed. The frequency signal of an airflow meter can be tuned for fuel.


MODE=11 Single Ignition Advance and Retard + Road Speed Governor
The ignition pickup is from a single sensor, magnetic or optical, which can be advanced or retarded. The signal must be "uniform", and it must repeat every engine turn (or every two turns). Multiple "teeth" or trigger points per firing are allowed. The road speed governor allows to move gear-switching points and remove (or shift) the road speed governor.


MODE=12 Two Ignition Advance and Retard
Both ignition inputs can be advanced or retarded. The RPM is derived from the CB1 (RPM Deflection) input, and the ignition advance and retard timing is calculated from it, and then applied to BOTH ignition outputs.


MODE=13 Single Ignition Advance and Retard + PWM Fuel
The ignition pickup is from a single sensor, magnetic or optical, which can be advanced or retarded. Same as mode=10 or mode=11. The duty cycle of a frequency signal (CAM or boost control) can be controlled from the fuel map.


MODE=20 Odd Signal Retard
The ignition pickup is from a single sensor with "odd" tooth pattern. The pattern is only repeated every crank or every second crank turn. This signal is only retarded.

Note that this mode uses the global settings differently.

 

Operations Mode : 20
Cylinders : 4, 6, 8
Teeth Per Turn : Teeth per 2 crank turns
Teeth Per Turn : Injection Position

 

The "odd" signal refers to uneven length, uneven amounts of triggers, and uneven pulse distribution of the input signal. The pulse "train" is repeated to the output, but can be "delayed=retarded" up to the minimum input pulse width.

 

One of the preceding modes must be specified in the GLOBAL SCREEN (F4). Details of the various SMT6 functions are provided in the following pages.