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MME Motorsport GCU7 Manual

Gear control unit
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GCU7 Manual
2023-08-01
Gear Control Unit
GCU7 Manual
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Summary of Contents for MME Motorsport GCU7

  • Page 1 GCU7 Manual 2023-08-01 Gear Control Unit GCU7 Manual...

  • Page 2: Table Of Contents

    GCU7 Manual 2023-08-01 Contents Contents ................................ 2 GENERAL OPERATING GUIDE ........................ 3 CONNECTING TO THE GCU ........................3 UPGRADING THE FIRMWARE ........................ 4 GAUGES OVERVIEW ..........................5 GEARBOX & CAN CONFIG ........................6 H-PADDLE SHIFTER ACTUATORS SETUP ....................9 H-PADDLE SHIFTER ACTUATORS SETUP - ADVANCED ................ 11 INPUTS &...

  • Page 3: General Operating Guide

    BUS is already properly terminated. You just need to connect the CAN+ and CAN- to existing line and that’s it. If your car does not have CAN BUS or you’re only connecting the GCU7 on a test bench, you need to insert a jumper in the GCU interface to successfully connect to the GCU.

  • Page 4: Upgrading The Firmware

    GCU7 Manual 2023-08-01 UPGRADING THE FIRMWARE Please note that firmware and software are published together and they must match. If they do not match, serious problems can occur so always make sure the version of the firmware and software is the...

  • Page 5: Gauges Overview

    GCU7 Manual 2023-08-01 GAUGES OVERVIEW RPM Gauge shows number of RPM. Below the RPM you will see current wheel speed (only if wheel speed sensor is enabled) along with the ideal (calculated) rpm according to the gear ratio, rpm and final drive. Clutch slip % is also shown.

  • Page 6: Gearbox & Can Config

    Gearbox type: Type: H / Synchro or H / Dogbox H-Paddle is MME Motorsport actuator assembly that controls 8 valves and shifts any H pattern. For more H-Paddle Shifter options see H-Paddle Shifter actuators. Number of forward gears is in the Number of gears dropdown.

  • Page 7: Gear Position Sensor

    GCU7 Manual 2023-08-01 Gear ratios Gear ratio for each gear. GCU will calculate the safe RPM for each gear, according to max engine RPM under the Down tab. See Downshifting for more info. FD is final drive ratio and is currently only used for if speed sensor is enabled. Can be ignored in most of applications.
  • Page 8 GCU7 Manual 2023-08-01 H-PADDLE ACTUATORS Only used if GCU is in H-paddle Shifter mode. Window shows the position of each actuator (H = horizontal, V = vertical). Before first use (or if actuators seem off), actuators need to be configured and calibrated. Click Setup configure the gearbox shifting pattern (which way is reverse, 1 –...

  • Page 9: H-Paddle Shifter Actuators Setup

    GCU7 Manual 2023-08-01 a. H-PADDLE SHIFTER ACTUATORS SETUP This screen can be opened by clicking the Setup button on GENERAL/SENSORS tab in H-Paddle Shifter actuator region. Before configuring the shift patterns, make sure your Number of gears parameter is correct (GENERAL/SENSORS) For each gear you need to set the position of each actuator.
  • Page 10 GCU7 Manual 2023-08-01 Horizontal actuator can have 2, 3 or 4 positions, depending on number of gears and shift pattern. Position 1 is fully closed. On power on options allow to set up what actions are taken when you power up the gcu. Vertical actuator: go to position 2 if invalid will move the vertical actuator to position 2 if position on power up is not in the middle (2), completely out (3) or completely in (1).

  • Page 11: H-Paddle Shifter Actuators Setup - Advanced

    GCU7 Manual 2023-08-01 b. H-PADDLE SHIFTER ACTUATORS SETUP - ADVANCED General operation for H pattern: Before doing any modification of the procedures, make sure mechanical actuator travel is correctly set and that mechanical linkages are working so they can shift correctly. Calibration of positions must be performed using Test window and basic moves should be done and verified by manually opening the valves and testing the POS 1, POS 2..
  • Page 12 GCU7 Manual 2023-08-01 There are 6 tabs that have procedures for direct gear shifts, that is Gear RN/NR, N1/1N, 12/21, .. 56/65. There direct procedures are only used when last gear was successful and horizontal actuator is locked. Locked horizontal actuator means that there are valves open that prevent the horizontal actuator to move.
  • Page 13 GCU7 Manual 2023-08-01 Condition: If condition specified by the selector is met, procedure will fail with error. Please note that these conditions are checked before command is executed.

  • Page 14: Inputs & Sensors

    GCU7 Manual 2023-08-01 INPUTS & SENSORS UP/DOWN input Switches C1/C3 Paddles are connected to the C1 and C3 inputs. Switches need to close to ground when active. To limit false triggering you can add Filter (ms) in milliseconds. Entering 50 here would mean that switch needs to be stable for the duration of 50ms (must not switch on and off) before it is detected as a full press.

  • Page 15: Throttle Position Sensor (Tps)

    GCU7 Manual 2023-08-01 CLUTCH SENSOR/SWITCH This switch is activated when clutch is pressed, either manually or automatically. For most applications, Type: Switch D2 is used. If switch is on, when it should be off (mechanically), you can Invert it. If switch is disabled, switch is always off so every function in the system that counts on it, will fail.

  • Page 16: Wheel Speed Sensor

    GCU7 Manual 2023-08-01 CAN Device If CAN is enabled select the ECU you have. If your ECU is not in the list, please contact us with car info and ideally CAN BUS dataset so we include this in the software & firmware.
  • Page 17 GCU7 Manual 2023-08-01 BRAKE SENSOR Brake sensor is only used with MME Clutch Actuator (CA) and is not needed in most applications. Type: Switch C2 Switch is wired to C2 pin and must be closed to ground when active. If sensor is on when it should be...

  • Page 18: Up-Shift

    GCU7 Manual 2023-08-01 UP-SHIFT Please note: if any parameter is changed, settings must be sent to the GCU (Settings – send to GCU or Send Changed to GCU - F5) in order to take effect. Allow shift N to 1: If disabled, the only way to shift from neutral to 1 , is by hand.
  • Page 19 GCU7 Manual 2023-08-01 During shift: Switch UP/DOWN ports (sequential only): if checked, up and down output ports are swapped. Restore power after (deg): This option allows you to return the power before the gear is completely in. If this option is used, it’s very important that the engine ECU takes care of the soft power return (gradually applying the full power).
  • Page 20 GCU7 Manual 2023-08-01 Autoshift: Autoshift Mode: Defines the mode used. See below. Activate after (rpm): After which RPM, Autoshift becomes active. RPM must be over this value to start and, when active, If the rpm drop below this rpm, Autoshift is stopped. Please note that this is NOT the rpm where GCU will shift the gear.
  • Page 21 GCU7 Manual 2023-08-01 Autoshift Mode: 2 Stage Procedure to start: - Driver must turn the autoshift mode on with the autoshift switch. It’s important that this switch is toggle (fixed position) and not momentary type. LED will turn on. - When RPM is over the Activate after N rpm & While TPS is over %, autoshift mode is activated. LED will be flashing.

  • Page 22: Down-Shift

    GCU7 Manual 2023-08-01 DOWN-SHIFT Please note: if any parameter is changed, settings must be sent to the GCU (Settings – send to GCU or Send Changed to GCU - F5) in order to take effect. Allow shift 1 to N: If disabled, the only way to shift from 1 to Neutral is by hand.
  • Page 23 GCU7 Manual 2023-08-01 Before the shift: Disable shift if TPS > %: If throttle is applied (more than Disable shift if TPS >) we don’t want to allow downshift. Typical value: 20 % Min between shifts: the time in milliseconds allowed between shifts.
  • Page 24 GCU7 Manual 2023-08-01 Blip until barrel moves: Stops blip when relative movement of the gear position sensor is N degrees. Typical value: 0. Max blip duration: Specifies what the maximum throttle blip duration is (in milliseconds). Even if specified degrees are not reached, GCU stops the throttle blip. If by gear is enabled you have an option to specify max duration for each gear.
  • Page 25 GCU7 Manual 2023-08-01 After shift: Keep in gear after shift (ms): how many milliseconds after the gear is engaged, GCU keeps the actuator active. Typical value: 50 ms Lever return actuator: one some sequential gearboxes, when actuators are mounted, the return spring is too soft to return the gear lever back into the position fast enough.

  • Page 26: Clutch

    GCU7 Manual 2023-08-01 CLUTCH Driving bite point: After the shift, this is the position we call bite point and this is the position clutch will go to. Start with the same value as starting bite point (make sure you learn it first). It’s easier to test it when downshifting (blip should be turned off for this setup).
  • Page 27 GCU7 Manual 2023-08-01 50%, this value would be 400ms. You can use Show clutch helper diagram to see diagram of the parameters entered. Stop bite point when rpm diff <: if at any time rpm difference (while shifting) is less than Stop bite point when rpm diff <, clutch returns to zero (in Release duration at 100% throttle time).
  • Page 28 GCU7 Manual 2023-08-01 Starting off: Starting bite point point: For the first time and after some time, it’s advised to learn the bite point. This is done by pressing Learn button. Procedure to learn the bite point: - put the car in first gear and press the brake (clutch should be fully in)

  • Page 29: Compressor

    GCU7 Manual 2023-08-01 Antistall: If Enabled antistall will trigger automatically in specified Ramp (ms) if wheel speed drops below the Driving speed (km/h) and brake is applied. If brake is not applied,antistall is disabled. Antistall is not possible without Starting off enabled.

  • Page 30: Misc

    GCU7 Manual 2023-08-01 11) MISC Please note: if any parameter is changed, settings must be sent to the GCU (Settings – send to GCU or Send Changed to GCU - F5) in order to take effect. On power on options allow to set up what actions are taken when you power up the gcu. Vertical actuator: go to position 2 if invalid will move the vertical actuator to position 2 if position on power up is not in the middle (2), completely out (3) or completely in (1).
  • Page 31 Send to device over CAN: If this is enabled, GCU will output can bus dataset with gear, rpm, button pressed etc. If MME Motorsport DASHBOARD is used, this is the dataset that is broadcasted to the bus: CAN2.0B, 11 bit, 8 bytes. 16 bit values sent high byte first (MSB)
  • Page 32 GCU7 Manual 2023-08-01 MID NEUTRAL When enabled (see GENERAL under GEARBOX) it allows the GCU to shift partially to neutral between 1 and R. It does this by pulsing the valve, while checking if the gear is neutral or has moved for more than Stop after GPS moves degrees.

  • Page 33: Sequential Gearbox - Quickstart

    If you have Engine ECU capable of complete paddle shifting logic, use Ext. Logic. Please note: if you only do the cutting with Engine ECU, you still need the Standalone, because GCU7 will still need to send a signal to cut. •...
  • Page 34 GCU7 Manual 2023-08-01 Go to UP tab and: • Adjust Allow shift from N to 1 and R to N accordingly. • Put these to 0: Delay after cut, Keep cut after shift, Don’t cut if TPS <, Actuator preload, Lever return actuator.

  • Page 35: H Pattern Gearbox - Quickstart

    If you have Engine ECU capable of complete paddle shifting logic, use Ext. Logic. Please note: if you only do the cutting with Engine ECU, you still need the Standalone, because GCU7 will still need to send a signal to cut. •...
  • Page 36 GCU7 Manual 2023-08-01 Under DOWN tab: • Adjust Allow shift from 1 to N and N to R accordingly. • Adjust the Max engine RPM parameter. This is the absolute maximum engine rpm you will able to reach when downshifting.
  • Page 37 GCU7 Manual 2023-08-01 Under CLUTCH tab: • Leave the Enabled unchecked and skip this chapter if you have a dogbox, otherwise leave it checked. • Under Starting off: Set Starting PID to 0.1, 0.1, 0 and PID2 to 0.1, 0.1, 0. Stop bitepoint when rpm diff to 100, Release duration at 100% throttle to 1500.

  • Page 38: Setting Up Drive By Wire

    GCU7 Manual 2023-08-01 14) SETTING UP DRIVE BY WIRE Before starting, you need to identify the potentiometer wires on the pedal. On most cars there are 2 potentiometers (even 3 in some cases).What you need to do is put the GCU in the middle of the pedal and ECU so GCU is able to control blip the throttle automatically.

  • Page 39: Setting Up Gear Lever Shift + Paddle Shift Together

    GCU7 Manual 2023-08-01 15) SETTING UP GEAR LEVER SHIFT + PADDLE SHIFT TOGETHER GCU supports having 2 ways to shift simultaneously. This way you can use GCU to do closed loop shift if you decide to shift via paddles or use your existing gear lever to shift.

  • Page 40: Tuning - Up Shift

    GCU7 Manual 2023-08-01 16) TUNING - UP SHIFT GCU has datalogging capabilities that allow you to capture all shifting events. Logs can be accessed using menu Log/Read full data from GCU or using Log manager and download each session. As these logs tend to get huge, we recommend reasing the log before testing the parameters &...
  • Page 41 GCU7 Manual 2023-08-01 There are 2 parameters that define how fast actuator is activated. First one is Delay after cut (ms) and second Actuator preload (ms). Actuator preload 10ms means that we first move the actuator and then start the cut after 10ms, while Delay after cut 10ms means we cut for 10ms and then move the actuator.

  • Page 42: Tuning - Down Shift

    GCU7 Manual 2023-08-01 17) TUNING - DOWN SHIFT GCU has datalogging capabilities that allow you to capture all shifting events. Logs can be accessed using menu Log/Read full data from GCU or using Log manager and download each session. As these logs tend to get huge, we recommend reasing the log before testing the parameters &...
  • Page 43 GCU7 Manual 2023-08-01 Example of good down shift: Here you can see that we add blip, then later on start the actuator. You can see that it takes some time that engine reacts to the blip (red). You can see the amount of TPS it reaches (white).

  • Page 44: Frequently Asked Questions And Troubleshooting

    GCU7 Manual 2023-08-01 18) FREQUENTLY ASKED QUESTIONS AND TROUBLESHOOTING Can’t connect to the GCU If you see a red DISCONNECTED bar in the bottom it means that either USB CAN interface is not plugged in or you don’t have proper drivers installed. On Windows 7 and newer, drivers are automatically installed once you plugged in, but it could take up to 5 minutes from the to finish loading.
  • Page 45 GCU7 Manual 2023-08-01 Cutting doesn't seem to work when I shift up Most common reason for the cut not to fire is when clutch is pressed. Make sure that clutch switch is working properly (input button must »light on« when you press the clutch. Invert it if needed). If you do not have clutch switch installed, you need to disable it.

  • Page 46: Pinout

    GCU7 Manual 2023-08-01 PINOUT Function Wire color Note Pressure transducer Yellow Input [0-5V] Gear position for sequential gearbox Blue Input [0-5V] or Gear position Vertical for H pattern Ground for sensors Black Ground Gear output White/Red Output [0-5V], 200 mA...
  • Page 47 GCU7 Manual 2023-08-01 N.C. Shift Light Brown/Blue Output [active low] Reverse valve White/Pink Output [active low] Compressor relay Pink/Green Output [active low] N.C. Auto Launch Pink/Brown Output [active low] Ignition cut White/Black Output [active low] Vertical valve 3 for H pattern...
  • Page 48 GCU7 Manual 2023-08-01 Ignition 12V Red (0.75 mm^2) Ignition switch N.C. N.C. 5V supply for sensors Pink Max 100 mA N.C. Battery - Black (0.75 mm^2) Yellow/Green (1.5 Coil supply OUT 12V output mm^2) Yellow/Green (1.5 Coil supply IN 12V input...

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