KPERFORMANCE SM3+ ECU Module User Manual

SM3+ ECU r1.5b User Manual Kperformance

SM3+ ECU User manual
Software,drivers and latest info can be downloaded at
www.Kperformance.be

R1.5b november 2022

Introduction

Congratulations buying the SM3 ECU. The circuit is based on Megasquirt 3. It was refined build 100% AEC-Q100 compliant and IP65 grade! A KPerformance Wideband Lambda Controller is also part of the SM3 ECU. A Bosch LSU 4.9 sensor can be connected directly without the need to buy a extra controller.

Included in Delivery

• SM3 ECU
• USB cable pre-crimped
• User manual
• ECU Connector pins and cover

Software
Recommended free tuning software TUNERSTUDIO and/or Megalog viewer.
USB Driver
The onboard FTDI chip simulates a serial RS232 connection:
Tunerstudio – Communications – Settings:
USB and Wireless (registered Version), Auto , 115200 Baud
Data Connections
Our SM3 is smart, it will automatic revert to master USB connection as soon as the USB cable is plugged in! Without USB connection it will switch to Bluetooth(if installed).
OnBoard Bluetooth (optional)
Its Pre-configured and ready to use simulating a serial RS232 connection.
Name: SM3+ with pin: 1234 or 0000
USB Port
The USB port of the SM3 is equipped with 8kV ESD protection of VBUS and Data lines. The data chip and ESD protection is “USB powered”. This fact simplifies the optimization of the start-up behaviour significantly when you restart the ignition, the PC wont download the USB driver each time. The USB chip is of course downwards compatible, which means it can be used both with USB 3.0, 2.0 and 1. To achieve maximum water tightness IP65 grade, we pre-crimp the USB on to the ECU connector.
Fuses
Recommended input fuse for protecting the SM3 :
-3A slow blow single lambda
-5A slow blow dual lambda
A automated 5A PTC SMD fuse is integrated on the board. It will reset itself after cooling down/solving issue or short circuit.

Electrical connections

Like all other voltage supplied parts – must be preceded by a fuse in function of cable section.
Recommended cable types:

• Ignition: min 1.5 mm²
• Injection: min 1.5 mm²
• VR sensor: min 0.5 mm²
• Shielded Sensors: min 0.35 mm²
• Others: min 0.35 mm²

Internal LED’s functions

Pin numbering is also marked on both plastic connectors
-Spare “Power Input“pins can also be used to power low current devices as HALL, Boost,Idle -valves,LSU4,9’s etc
-DirectCPU pins have no safety nor short circuit protection!
Be careful using these pins.
Pulling down to ground is safest way to use any digital input

Engine Speed Measurement

VR sensors inputs:

• CRANK: VR-1N&VR-1P
• CAM: VR-2N&VR-2P

Rising Edge is most accurate for VR-type sensor !
Very hot VR signals: only connect VR positive inputs.
Hall & Optical inputs:

• CRANK: VR-1P
• CAM: VR-2P

!Leave VR-1N & VR-2N floating (do not connect)
Signal Pull-Up: wire loop (see image above)
Throttle Position Sensor
The throttle potentiometer is connected up by a 3-wire cable. +5V and GND are connected to the outer static pins of the potentiometer. The corresponding calibration is done under TunerStudio via
“Tools” – “Calibrate TPS”
Temp Sensor Inputs (CLT+IAT)
This sensor measures the temperature of the engine coolant (or cylinder head for air-cooled engines.) It is primarily used to provide additional fuel during engine warm-up.
One wire connects to ground, the other to the CLT/IAT input on the ECU. One- wire sensors are not recommended.
Common sensor presets available under TunerStudio!
Digital Input
There are digital inputs(DIN) that can be used for example as “Launch Control”. The corresponding function has to be defined in Tunerstudio. Preferable use Ground activated.
Never connect more than 5V on any input!
Analog Input
There are analog inputs(AIN) that can be user programmed The corresponding function has to be defined in
Tunerstudio. Additional pressure, Flex, temp sensors can all be connected.
Never connect more than 5V on any input

Programmable Output

There are General Purpose Outputs(GPO) that can be user programmed and have to be defined in Tunerstudio.
Idle Speed Controller (Fidle)
The SM3 supports both the 2-pin and the 3-pin idle speed valves.
Pin connections of the idle speed control:
2-pin: +12V & FDLO
3-pin: +12V & FDLO (open) & FDLC (closed)
The FDLO & FDLC are automatic inverted on the PCB, use Fidle control under TunerStudio,

Ignition

The ignition coils can be activated directly by the integrated power drivers. We recommend using a shielded multiconductor cable . The SM3 is equipped with 6 power drivers enabling sequential activation of 6 passive ignition coils or 12 in wasted spark. We designed the outputs so it’s possible to trigger 6 Passive coils OR 6 smart coils by using the correct ECU connector output pins!

• 6x Passive Coils Power Ignition outputs (Ground Activated Coils)
• 6x Smart Coils Ignition Outputs (5V TTL Activated Coils)

Do not connect/use both Ignition methods at the same time!
Spare un-used Ignition outputs, can be used as additional programmable outputs.
TTL level outputs = smart coils
High Power IGN outputs = passive coils
Passive coils NEED atleast 2x IGN GND pins(6-36-66) to be connected directly to a good high current capable ground.
Ex Chassis,Engine,battery etc
SM3 firing sequence ABCDEF,please wire accordingly We prefer active coils to keep high feedback voltages out of the SM3 ECU! 12V powering of coils and injectors is done by relays, PMU, switches etc ,never via the ECU pins!

Injection

There are 6 injector outputs (INJ1-6) ; The injection valves are supplied with +12 V via the ignition switch and the ground side of the injectors are activated via the SM3 ECU.
Attention: The setting whether the injection valves are of high or of low resistance has to be entered in Basic Settings” – “Injector Characteristics” strictly before the first test run because wrong settings can cause destruction of the injection valves and/or the SM3.
Starting values (no guarantee):
High impedance:
PWM Current Limit (%): 100
PWM Time Threshold (ms): 25.5
Low impedance:
PWM Current Limit (%): 30
PWM Time Threshold (ms): 1.5
SM3 firing sequence ABCDEF,please wire accordingly 12V powering of coils and injectors is done by relays, PMU, switches etc ,never via the ECU pins!
Onboard Wideband Lambda Controller (Optional Dual)
A Bosch LSU 4.9 sensor can be connected directly without the need to buy a further controller. (connect according onboard LSU4.9 pin numbers)
Calibration data TUNERSTUDIO custom linear wideband:
0V = Lambda 10.20 = AFR 22.35
4V = Lambda 0.650 = AFR 9.50
Starting of the Lambda controller is done by
software grounding selecting :
Output “Ignition G/O2controller” if necessary with optional customer requirements settings.Not grounding the output will result in standby lambda controller(s).
Onboard Knock
The knock IC uses a purpose designed dual knock sensing amplifier chip to filter knock signals. Inputs Knock1 & Knock GND & Knock2
Onboard Baro
The SM3 is equiped with an onboard barometric MPX6115 sensor.
Input Spare ADC13/Baro Onboard EGT The EGT IC uses a purpose designed amplifier chip to filter Ktype sensor signals and uses “EGT/AD6 input” selectable via tunerStudio.
Optional pre-crimped K-thermocouple connection kit available CAN Bus Like for MegaSquirt the CAN Bus hardware is populated on the board, but has to be setup accordingly by the user/hardware if desired.
Couple of CAN pre-sets are available under TunerStudio

R1.5b november 2022

References

• KPerformance
• KPerformance

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