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SMT6 Developers Manual - Keyword Index

SMT6 DEVELOPERS MANUAL

Perfect Power Online Manuals.

 

Support for your SMT6 Unit.

KEYWORD INDEX

PICKUP

A device which produces an output (change) in relation to the crank position.

 

OPTICAL PICKUP

Normally located in a distributor. It has three wires, +12 signal, GND. The signal output requires a "pull-up" resistor to +12 Volts (4K7 to 10K) and then the signal wire "jumps" between GND and +10 Volts when the crank turns.

 

MAGNETIC PICKUP

Has 2 wires and a shield. The shield (screen) must be connected to the ECU GND and not to the engine. One wire goes to the GND of the ECU, the other has positive/negative signal when the shaft is turned. These pickups are found on the crank or in the distributor.

 

MISSING TOOTH PICKUP

Located on the crank, it has multiple teeth (24-60) per turn and one or two teeth missing. The missing teeth (gap) signifies a defined crank position (TDC or other).

 

INTERLINKED SIGNALS

This means that a crank trigger signal has a defined relationship to a cam signal, and if this relationship is "modified" then the ECU assumes that the cam has slipped and the ignitions are stopped, or the ECU "misbehaves" otherwise.

 

ANALOG FUEL TUNING

An analog signal (e.g. 0-10V) is modified via the fuel map.

 

PWM FUEL TUNING

A PWM signal is modified via the fuel map.

 

PWM SIGNAL

A signal with an unimportant frequency, where the information is contained in the "duty cycle" . The SMT copies the frequency, but modifies the duty cycle. Used for proportional CAM variations and boost control.

 

INJECTOR ACTIVATION

The SMT can drive up to 7 Amps, which are 8 x 16 ohm, or 4 x 8 ohm, or 2 x 4 ohm  injectors. The injectors are activated proportional to RPM and the map values.

 

ROAD SPEED GOVERNOR

This is not the RPM limit of the ECU, but a signal derived from the transmission train, which changes proportional to the road speed. This signal is used for automatic gearbox shifting and to limit the max. wad speed via the ECU.

 

INTERLACED

The ignition on a 4 cylinder wasted spark system is "interlaced"

 

SELF TEST

The SMT performs an internal self test when power is applied. However, a special self test feature can be performed via a PC and a test harness which checks every input/output for the correct performance.

 

INJECTION

A method to add more fuel to the engine through an ADDITIONAL injector(s) which must be mounted somewhere in the manifold, preferable BEFORE the butterfly. The injection output is optional and must be ordered.

 

MAP

A file, which can be loaded in to the SMT6, describing the modification done to the  fuel, injection, and ignition. The SMT6 can hold two MAP sets, each set has a fuel injection and ignition map.

 

MODE

A method to "configure" the SMART TUNER SMT6 to perform a specific task.

 

DEVELOPER

A dealer or user who wants to develop his own application for an engine without a wiring diagram.

 

WIRING DIAGRAM

A standard form of SMT6 wiring, which shows all wires, location of ECU, ECU connector, and library used for setup.

 

ODD RETARD

An operating mode (20), which allows the retarding of "odd" signals.

 

DWELL TIME

Used with ignition output. It is the time the current flows in the coil.

 

 

ROAD SPEED GOVERNOR

ROAD SPEED DEVIATION :
In mode = 11, which activates the road speed circuit, the output frequency (road speed signal) can be deviated by the specified percentage.

 

ROAD SPEED LIMIT :
This restricts the output frequency (road speed signal) to the specified "period". For details see Road Speed Governor.

 

 

FUEL AND IGNITION AFFECTING VARIABLES

 

ANALOG ZERO :
This is the "offset" between the analog input (AIN) and the analog output (AOUT).
It can be used to make the complete fuel map richer or leaner.

 

IGNITION DWELL TIME :
Adjusts the dwell time of ignition management applications.

 

FUEL UPPER LIMIT :
This is a voltage specification, which restricts the output to rise above the specified value. This is good for tuning "LAMBDA", or it prevents the ECU from displaying a  "service fault".

 

FUEL LOWER LIMIT :
Same as above, but the lower limit. The output voltage is prevented from falling below this value.

 

 

GENERAL SYSTEM VARIABLES

 

Operating Mode :

1 - Missing Tooth Operation
10 - Single Ignition + Frequency Fuel
11 - Single Ignition + Road Speed Governor
12 - Two Ignition
13 - Single Ignition + PWM Fuel
20 - Odd Retard

 

The operating modes must be set to one of the above numbers. Any other entry results in a "BAD MODE" display.

 

CYLINDERS
Any amount of cylinders can be specified. This entry affects the RPM indication, and  the ignition calculation in degrees.

 

TEETH PER REVOLUTION
The amount of trigger signals per revolution (360 degrees), including any missing teeth

 

TEETH PER FIRING
Amount of trigger signals between firings.

 

 

IGNITION

 

The ignition modification is specified in the IGNITION screen (F3). The maximum deviation is :

 

Mode = 1 : +- 2 teeth
Mode > 1 : +- 180/cylinders

 

Ign. adv. limit : This entry restricts the ADVANCE map entry.
Ign. ret. limit : This entry restricts the RETARD map entry.

 

 

SETPOINT SWITCHING

 

SMT6 can switch the AUXOUT wire (orange) according to the limits (4) variable on the global screen. The output is rated at 100mA, and it goes low when the RPM is higher than the limit. The following limits are available :

  • RPM Limit
  • Temperature Limit
  • AMP Limit
  • Deflection (Throttle) Limit

 

SMT6 - Set Point Switching

SET POINT SWITCHING

 

The Switching is NON-Proportional.

 

 

SYSTEM BIT SETTINGS

 

POS IN POL
y enables positive triggering on the input

 

POS OUT POL
y enables positive triggering on the output. In most applications input and output polarity should be the same

 

LOW LEVEL IN
Used to switch input trigger from 2.5V to 0.1V for smaller trigger signals.

 

HIGH FREQ
Change bandwidth of frequency load detection from 10-3, 3kHz to 80-18kHz.

 

LOW DEVIATION
Changes map deviations by a factor of 4.

 

INTERLACED
Modifies RPM reading for interlaced signals

 

ONE MISSING TOOTH
Specifies that missing tooth signal is single tooth rather than two

 

MULTI COIL
For multiple coil outputs in ignition management applications.

 

LAMBDA INPUT
Redirects analog fuel input to the lambda sensor

 

LAMBDA UNL
Fuel modifications on maps change the output according to a non-linear curve.