MoTeC LTC User Manual Contents Introduction .............................................................................. 2 Installation ................................................................................ 4 LTC Installation ..................................................................................... 4 Lambda Sensor Installation .................................................................. 4 LTC Manager Software Installation ......................................................
Introduction Introduction MoTeC LTCs (Lambda to CAN) monitor and control Wideband Lambda sensors and transmit Lambda readings and diagnostics on a CAN bus. There are single channel LTC and Dual channel LTCD available to suit either Bosch LSU4.9 or NTK sensors: • #61300 – Single channel Bosch LSU 4.9 Sensor • #61301 – Dual Channel Bosch LSU 4.
MoTeC Introduction Accessories • #57006 Bosch LSU 4.
Installation Installation LTC Installation The LTC can be mounted to a flat surface using the two mounting holes. The LTC should be mounted as far as possible from the exhaust to avoid excessive heat. Note: LTC maximum ambient temperature is 100 °C. Use Connector A to connect the single LTC to the Lambda sensor. Use connectors A and B to connect the LTCD to two Lambda sensors. Use the Power/CAN Connector to power the LTC and connect to the CAN bus. See Appendices for more details.
MoTeC Installation 5 • Place the sensor at least 1 meter from the open end of the exhaust system to avoid incorrect readings due to outside oxygen (recommended) o Where necessary for shorter exhaust systems the sensor could be placed closer to the engine. • Place the sensor away from the flame front coming out of the cylinder head and away from areas where one cylinder may have more effect than another.
Installation LTC Manager Software Installation The LTC Manager software is required for configuration and calibration of LTC units. The software must be installed on Windows XP or Windows Vista. The same software package is used for the LTC, LTCD, LTC-N and LTCD-N. Note: The LTC Manager software is not required if using a single LTC or LTCD unit preconfigured by MoTeC.
MoTeC Installation 7 Install LTC Manager Software • Go to the MoTeC website at www.motec.
Configuration Configuration Introduction Note: LTC units come pre-configured to suit a single LTC or LTCD unit installation using the initial factory sensor calibration. The default CAN address for the singular LTC is hex 460. The default CAN addresses for LTCD is hex 460 for Lambda sensor 1 and hex 461 for Lambda sensor 2. LTC Manager is used to individually configure and calibrate the connected LTC units.
MoTeC Configuration 9 LTC Unit Setup • To open the LTC Setup window, double click the row in the table containing the LTC or click the row and click Setup. • Select the Recommended Address check box and enter one of the addresses in the drop down box to communicate with MoTeC products such as Data Loggers or 'hundred series' ECUs. The recommended address range for LTC messages is hex 460 to hex 47F.
• Configuration Click OK. The configuration updates will be sent to the LTC, this may take several seconds LTC-N Unit Setup • To open the LTC Setup window, double click the row in the table containing the LTC or click the row and click Setup. • Select the Recommended Address check box and enter one of the addresses in the drop down box to communicate with MoTeC products such as Data Loggers or 'hundred series' ECUs. The recommended address range for LTC messages is hex 460 to hex 47F.
MoTeC Configuration 11 Note: Lambda sensors should not be left in the exhaust system of a running engine if they are not being controlled. A disabled sensor in a running engine can be damaged. • • In the Name area the default name will appear. The default name matches the selected CAN Address (LTC1 etc.). If required the user can specify a custom name (e.g. Left Bank or Cylinder 4). Tip: The rows in the main LTC Manager window are sorted by the Name column.
Configuration When the Edit button is clicked under Output Table a table of Normalized Current appears. The standard Lambda values appear in the Output column, these numbers can be modified to reflect Air/Fuel ratio of a specific fuel. See Appendix F for details of common fuels. Custom tables can be saved using the Save As button.
MoTeC Configuration 13 address is hex 460, the slave devices must use CAN addresses in the range hex 461 to 46F. The Collect column on the main LTC Manager Window shows the configuration of CAN Collect Masters and Slaves. The Master device is always shown as LTC unit 1 (Master (1)), and the slave devices are shown as LTC units 2 to 16 according to the configured CAN address as shown in this example. Calibration Warning: The Bosch LSU 4.
Configuration Contaminated air will result in an incorrect calibration or a failure to calibrate. Wind should also be avoided as it can affect the free air calibration. Reference Gas Calibration Reference gas samples for different lambda can be purchased (not available from MoTeC) for use as a means of calibrating the LTC. This method is provided for but is unlikely to be implemented by most users.
MoTeC Configuration 15 Calibrate the LTC-N Unit • Click Calibrate… to open the Gain Calibration window • Select one of the four options available. o Select the Initial Factory Sensor Calibration check box. This is the default value and can be used in most cases. OR Select the Entered Gain Factor from a previous Free Air Calibration or Reference Gas Calibration OR Select the Free Air Calibration check box to perform a new calibration.
Configuration Firmware Each version of the LTC Manager software includes a matching firmware version that must be sent to the LTC in order to operate correctly. The Config Status column in the main LTC Manager window will indicate if the firmware version requires updating. Update the Firmware • Select the LTC row in the main LTC Manager window • Click Update Firmware. A progress window will be displayed while the firmware is sent to the LTC.
MoTeC Operation 17 Operation Monitoring LTCs The main LTC Manager window shows live readings, diagnostics and LTC state information for all connected LTCs. Serial Num The Serial Num column shows the unique serial numbers of all connected LTCs. An LTCD will be displayed as two LTCs with the same serial number but the designators A and B to identify the two sensors. Name The Name column shows the assigned names of all connected LTCs. The displayed name is configured in the Setup dialog.
Operation • Choose a predefined stoichiometric AFR for one of various fuels OR Define a custom AFR by entering a stoichiometric point between 1.0 and 100.0. Display live readings in larger format • Select View > Readings or press F5. This larger format display provides a useful means of monitoring several sensor values while tuning. Sensor State The Sensor State column shows the operating state of all connected LTCs.
MoTeC Operation 19 Diagnostics The Diagnostics column shows faults and diagnostic information for all connected LTCs. Diagnostic Description Heater short circuit (GND) A short circuit to ground has been detected in the heater wiring Heater short circuit (Batt+) A short circuit to battery+ has been detected in the heater wiring Heater open circuit An open circuit has been detected in the heater wiring Failed to achieve heat The measured sensor temperature is not responding to sensor heating.
Operation Any LTC unit configured with a CAN address within the 15 CAN addresses following a Collect Master address will be shown as Slave (x). The number in the collect column (e.g. (3)) refers to the LTC number (1 to 16) in the messages transmitted by a Collect Master LTC. For more information about CAN Collect, see CAN Collect Functionality Config Status The Config Status column shows any issues relating to the configuration of the connected LTCs.
MoTeC Operation 21 • Click on an unused CAN row in the Communication Sections • Click Select button and choose a template o o Select the matching template (e.g. LTC #1 (CAN ID 460)) to receive all available readings and diagnostics from an LTC. The selected template must match the LTC CAN address specified in LTC Manager. Receiving full LTC messages provides the most information about an LTC and requires one CAN section per LTC in the communications setup.
Operation Enter 1 - PLM Receive for CAN 6 Data Enter the LTC CAN address in decimal* for CAN 6 address. The address must match the CAN address specified in LTC Manager for the CAN Collect Master LTC. The recommended address is 1120. * Important: CAN addresses in ECU Manager are in decimal, while the CAN addresses in LTC Manager are in hex. e.g.
MoTeC Operation 23 Example 2: LTC1 to LTC4 readings assigned to Lambda Cyl channels Assign Lambda measurements to a M84 channel For an M84 the Lambda Input Source is fixed so only the Calibration needs to be chosen – Predefined “#81 Lambda: PLM over CAN”
Operation Lambda and Air Fuel Ratio Lambda gives a measure of the Air to Fuel Ratio (AFR) that is independent of the type of fuel being used. Lambda 1.00 Stoichiometric ratio: no excess fuel and no excess air Lambda > 1.00 Lean: excess air Lambda < 1.00 Rich: excess fuel Stoichiometric Air Fuel Ratio for various fuels Lambda 1.0 Air Fuel Ratio Petrol Alcohol LPG Diesel 14.7 6.4 15.5 14.5 Calculations with Lambda Fuel Stoichiometric AFR Measured value Calculated value Petrol 14.
MoTeC Operation 25 Lambda Sensor Sensor Warm-up The internal heater in the Lambda sensor is powerful enough to allow accurate measurement when gas temperature is at room temperature. The sensor will take approximately 20 seconds to heat up. The maximum continuous operating temperature of the sensor is 850 °C. Sensors should not be used at higher temperatures for a prolonged period, although the sensor can be heated to 930 °C for a maximum of 10 minutes. This may however reduce the accuracy.
Operation LTC Operating Tips If the engine misfires for any reason, including an over-rich mixture, the LTC may falsely read Lean. This is due to excess air being present in the exhaust gasses, caused by incomplete combustion. Other areas that can give misleading readings include at high RPM, closed throttle when the mixture won’t burn completely. Following overrun fuel cut when the sensor has become saturated with oxygen it can take up to several seconds to resume accurate readings.
MoTeC Appendices 27 Appendices Appendix A – Specifications Sensor Type • • NTK LZA09 Lambda Sensor Power Supply • 11 V - 16 V DC • 110 mA typical current plus the sensor heater current. • Heater current is typically 0.5 A - 1 A (up to 2 A on startup) Communications • 1 Mbit/sec CAN Physical • Dimensions 38 x 26 x 14 mm excluding wiring looms and connectors • Weight 62 grams • Mounting holes spacing 32 mm (Ø3.
Appendices Appendix B – Pinout Bosch LSU version (LTC 4.9) LTC Connector A LTCD Connector A and B Bosch LSU 4.
MoTeC Appendices NTK version (LTC-N) LTC-N Connector A NTK sensor connector Mating connector: supplied on sensor Pin No Wire Colour Description 1 Blue Heater + 2 Yellow Heater - 3 Orange Rc 4 Black Sensor 0V 5 N/C 6 Grey VS 7 White IP 8 Black Sensor 0V Power/CAN Connector DTM 4pin (M) (#68055) Mating connector: DTM 4pin (F) (#68054) Pin No Wire Colour Description 1 Black Battery - 2 Green CAN Lo 3 White CAN Hi 4 Red Battery + 29
Appendices Appendix C – Dimensions
MoTeC Appendices 31
Appendices
MoTeC Appendices 33 Appendix D – Wiring Details To connect a single LTC unit, the Power/CAN Connector pins should be wired according to the following table, taking into account general CAN bus wiring requirements: LTC/LTC-N Pin SDL & SDL3 (CAN 0) SDL3 (CAN 1) ADL2 ADL3 (CAN 0) ADL3 (CAN 1) ACL (CAN 0) ACL (CAN 1) M84 M400/M600/M800 M880 Battery 1 Ground CAN Lo 2 CAN Hi 3 35 29 73,75 73 75 5 7 B24 B24 47 36 30 74,76 74 76 6 8 B23 B23 48 Battery + 4 Power 12 V (see tip) Tip: To wire the LTC to pow
Appendices General CAN Bus Wiring Requirements The CAN bus should consist of a twisted pair trunk with 100R terminating resistors at each end. The preferred cable for the trunk is 100R data cable. The maximum length of the bus is 16 metres (50 ft) CAN devices (such as MoTeC Data Loggers, ECUs etc) may be connected to the trunk with up to 500 mm (20 in) of twisted wire.
Appendices These wires must be twisted Minimum one twist per 50mm (2in) CAN-HI CAN-LO 0V 8V CAN Device CAN Device CAN-HI CAN-LO 500mm Max CAN-HI CAN-LO CAN-HI CAN-LO 100R 100R << CAN Bus >> 500mm Max CAN Connector 1 100R Terminating Resistors at each end of the CAN Bus 35 CAN-HI 5 CAN-LO 4 3 MoTeC CAN Device 500mm Max
Appendices Appendix E – LTC CAN Messages Messages 1 and 2 are transmitted by all LTC units. Messages 5 to 10 are only transmitted from an LTC unit configured as a CAN Collect Master. Message 1 Byte Name Scaling 0 1:2 Compound ID = 0 Lambda Ipn (Normalised pump cell current) LTC Internal Temperature N/A Hi:Lo = x.
MoTeC Appendices 37 Message 3 Byte Name Scaling 0 Compound ID = 2 1 Firmware Version Letter 2:3 4:5 Firmware Version Number Serial Number N/A A B C e.g. 104 = v1.04 0 1 2 Message 5 Byte Name Scaling 0 1 2:3 4:5 6:7 Compound ID = 4 Reserved LTC1 (Master LTC) Lambda LTC2 Lambda LTC3 Lambda N/A N/A Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Message 6 Byte Name Scaling 0 1 2:3 4:5 6:7 Compound ID = 5 Reserved LTC4 Lambda LTC5 Lambda LTC6 Lambda N/A N/A Hi:Lo = x.xxxLa Hi:Lo = x.
1 2:3 4:5 6:7 Appendices Reserved LTC10 Lambda LTC11 Lambda LTC12 Lambda N/A Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Message 9 Byte Name Scaling 0 1 2:3 4:5 6:7 Compound ID = 8 Reserved LTC13 Lambda LTC14 Lambda LTC15 Lambda N/A N/A Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Hi:Lo = x.xxxLa Message 10 Byte Name Scaling 0 1 2:3 4:5 6:7 Compound ID = 9 Reserved LTC16 Lambda Reserved Reserved N/A N/A Hi:Lo = x.
MoTeC Appendices 39 Appendix F – Lambda to Air Fuel Ratio Table Lambda Air Fuel Ratio Petrol Alcohol LPG Diesel 0.70 0.75 0.80 0.85 0.90 0.95 10.3 11.0 11.8 12.5 13.2 14.0 4.5 4.8 5.1 5.4 5.8 6.1 10.9 11.6 12.4 13.2 14.0 14.7 10.2 10.9 11.6 12.3 13.1 13.8 1.00 14.7 6.4 15.5 14.5 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 1.45 1.50 1.55 1.60 15.4 16.2 16.9 17.6 18.4 19.1 19.8 20.6 21.3 22.1 22.8 23.5 6.7 7.0 7.4 7.7 8.0 8.3 8.6 9.0 9.3 9.6 9.9 10.2 16.3 17.1 17.8 18.6 19.4 20.2 20.9 21.
