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AFRecorder 2400G 

 

Four Function Engine Diagnostic System 

 
 

Instruction Manual 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

6/03 Part Number 2400G-11

Summary of Contents for AFRecorder 2400G

Page 1: ...AFRecorder 2400G Four Function Engine Diagnostic System Instruction Manual 6 03 Part Number 2400G 11...

Page 2: ...ENGINE CONTROL AND MONITORING Information and specifications subject to change without notice AFRecorder and AFRemote are trademarks of Engine Control and Monitoring IBM is a registered trademark of t...

Page 3: ...ower Hook up 5 Air to Fuel Ratio Hook up 6 Engine Speed Hook up 7 Spark Timing Hook up 9 Manifold Pressure Hook up 9 Analog Outputs and Simulated EGO Sensor Output 10 RS 232 Communication Hook up 10 S...

Page 4: ...Specifications and Limits 37 Output Specifications and Limits 41 General Information 43 Theory of Operation 45 Air to Fuel Ratio Sensing 45 Engine Speed and Spark Timing Sensing 46 Manifold Pressure...

Page 5: ...r recording Slow motion or select time playback with statistics Linearized and programmable 0 to 5 VDC analog outputs for each measured parameter Simulated EGO exhaust gas oxygen sensor output with a...

Page 6: ...00A 5 7 Pressure Vacuum Hose 5 32 20 ft 2400A 6 8 120 VAC U S Power Cord 6 ft 2400G 38 9 12 VDC Power Cord 20 ft 2400E 7 10a or b Spare Power Fuses 1 A b 0 5A Slow Blow 2400G 39 b for 120 VAC b for 23...

Page 7: ...liquid fuel or condensed water will collect on the sensor s tip To minimize thermal shock to the AFR sensor caused by condensed water operate the engine for approximately one minute before turning on...

Page 8: ...th the AFRecorder must be used Use only the probes and cables provided with the AFRecorder or those approved by ECM Route the spark timing and engine speed cables away from hot or moving objects Manif...

Page 9: ...YS REC ENT SYS stands for SYSTEM and pressing it halts the current operation and brings the AFRecorder to the main menu REC stands for RECORD and pressing it while the AFRecorder is measuring starts a...

Page 10: ...at is welded or brazed to the engine s exhaust pipe This thread size is identical to that of the exhaust oxygen sensors used in current production automobiles with 3 way exhaust catalysts Mounting bos...

Page 11: ...mid 1970s Figure 1 shows a typical installation Once the hook up for engine speed has been completed details about the engine speed signal must be input into the AFRecorder see Setup Constants RPM SP...

Page 12: ...ng the application and being available The wheel must be made out of steel and centered on the crankshaft The notches should have the same width and depth as the diameter of the pole of the magnetic p...

Page 13: ...SPARK PICKUP switch must be set to IND inductive Spark timing measurement may also be possible with other types of sensor signals and by tapping existing engine control system signals This includes d...

Page 14: ...between the units The serial port connector on the back of the AFRecorder is a male DB9 The serial port connector on the back of IBM compatible PCs is either a male DB9 9 pins or a male DB25 25 pins...

Page 15: ...ure Pman Depending on prior programming see Setup Display on page 16 and Setup Options Sensors on page 20 the AFRecorder may show just one or a combination of the measured parameters Figure 2 shows th...

Page 16: ...displayed if the spark timing is out of range Once the AFRecorder has begun displaying the measured parameters only two keys will alter its operation SYS System and REC Record The outcome of pressing...

Page 17: ...VAL Sample interval 3 OUTPUTS 1 ANALOG Program output ranges 2 SIM EGO Program EGO AFR switch point 3 ALARMS Alarm source limits 4 CAL D A Calibrate analog outputs 4 OPTIONS 1 SENSORS Select sensors 2...

Page 18: ...ement range then the closest limit value will be displayed recorded and used to calculate the statistics If the AFRecorder does not detect a spark or calculates an out of range spark it will display o...

Page 19: ...ENT will continue the replay At the end of the replay the AFRecorder returns to the results menu Pressing SYS will abort the replay and the AFRecorder will present the main menu Results Statistics If...

Page 20: ...sults menu Setup Menu SETUP is the third selection in the main menu and the gateway to configuring the AFRecorder The setup menu is shown in Figure 10 During setup the defaults or previous selections...

Page 21: ...ch AFR or Pman manifold pressure are shown The choices for AFR units are AFR or O2 The units of AFR are a mass ratio of air divided by fuel going into the engine equivalence ratio is dimensionless and...

Page 22: ...he setup menu SETUP OUTPUTS 1 ANALOG 4 CAL D A 2 SIM EGO 5 EXIT 3 ALARMS Figure 12 Setup Outputs Menu Setup Outputs Analog The choice of ANALOG from the setup outputs menu allows the setting of the an...

Page 23: ...on Setup Outputs Alarms The choice of ALARMS allows the setting of the measured values which trigger the alarm lights and the modulated buzzer The alarms lights and buzzer are triggered by measurement...

Page 24: ...eters to be recorded Because information from both the spark timing sensor and the engine speed sensor must be used to determine spark timing spark timing alone cannot be selected The SENSORS option a...

Page 25: ...engine s degree of combustion efficiency is entered after selecting ENGINE from the setup constants menu The three displays following this selection allow the entry of ICC incomplete combustion compen...

Page 26: ...hese displays RPM SPK CONSTANTS RPM PULSES 2 REV 2 RPM SPK CONSTANTS ACTIVE EDGE OF RPM 1 RISING 2 FALLING 2 RPM SPK CONSTANTS ANGLE OF RPM EDGE 180 TO 180 9 5 RPM SPK CONSTANTS SPK PULSES 2 REV 1 RPM...

Page 27: ...cturers If there is more than one notch on the balancer pulley but less than nine the crankangle of any notch location may be used General Motors 9 5 Ford 0 Chrysler 10 Table 2 Common Values for ANGLE...

Page 28: ...nu The information requested is H C RATIO the hydrogen to carbon atom ratio of the fuel O C RATIO the oxygen to carbon atom ratio of the fuel and N C RATIO the nitrogen to carbon ratio of the fuel If...

Page 29: ...bration Note that the correct O2 in air must be entered in Setup Constants Air before initiating AIR CAL The AIR CAL procedure takes approximately 10 seconds Upon completion the AGE FACTOR will be dis...

Page 30: ...owered down DISABLED and up ENABLED for sensor removal To avoid AFR sensor damage the sensor should only be removed or attached when the sensor is disabled or when the AFRecorder is off After enabling...

Page 31: ...am AFRemote AFRemote will run as a stand alone DOS program or from a MS DOS prompt within Windows AFRemote will work on floppy disk hard disk or RAM disk Simply copy the file AFREMOTE EXE to the desir...

Page 32: ...of the screen Dialog boxes request the entry of alphanumeric data which must be followed by the pressing of the Enter key or indicate that an error has been made The mouse will not operate while in a...

Page 33: ...in the bottom left corner of the screen REMOTE MODE SENDING DATA REMOTE MODE IDLE Figure 18 AFRecorder Display During Software Connection After the software connection has been completed operation of...

Page 34: ...val and the measurement averaging are at the FAST rate and are not adjustable see Table 1 on page 17 During real time display and real time plotting the AFRecorder also displays the measured parameter...

Page 35: ...plots i e type and scaling are made using the Plots menu and the Set Plot Type or Set Plot Scales selections Figure 20 AFRemote Four Parameter Plot Measurement with Direct Storage to Disk Real Time t...

Page 36: ...to store data in ASCII format than it does in AFRemote format Figure 21 is an example of an exported file The time and recorded measurements are always stored as five columns The columns contain from...

Page 37: ...py disk a hard disk or a RAM disk while being plotted on the PC s screen by selecting Plots followed by Real Time Plotting to Disk Activation of this option is very similar to Real Time to Disk see Re...

Page 38: ...ormat suitable for input into other data analysis programs File followed by Save Recorded Data stores data in AFRemote format A filename will be requested for the recorded data It is recommended that...

Page 39: ...ws use the Windows clipboard to capture the plot Setup The setup of the AFRecorder in remote mode is very similar to its setup in stand alone mode One difference is that in remote mode the modified se...

Page 40: ...elsewhere Spark Timing deg 60 BTDC inst 1 0 deg 2 30 ATDC3 Engine Speed RPM 100 9 999 inst 0 1 Manifold Pressure Psia 0 35 0 1 0ms 1 FSO atm 0 2 38 in Hg 0 70 0 kPa 0 241 1 AFR range given for gasoli...

Page 41: ...d its limit value is stored Sample Size 100 to 100 000 measurements of each parameter Sample Interval 0 1 to 60 seconds Input Specifications and Limits Air to Fuel Ratio Measurement Range Response Tim...

Page 42: ...antiseize compound Hex Size 22 mm Tightening Torque 30 3 ft lbf 40 4 Nm The AFR sensor s thread size is identical to that of the exhaust oxygen EGO sensors used in current production automobiles with...

Page 43: ...ation about the spark timing and engine speed signals must be input into the AFRecorder to complete the setup Refer to the sections entitled Setup Constants RPM SPK on page 22 and Engine Speed and Spa...

Page 44: ...ccuracy See the section entitled Measurements and Accuracy on page 36 Proof Pressure 60 Psia damage will occur at higher pressures Sensor Material All wetted surfaces are stainless steel Connector 1 8...

Page 45: ...tor In the case where the AFRecorder and an external data acquisition system are both powered by the same 12 VDC battery then the inputs of the data acquisition system receiving the output s from the...

Page 46: ...en the AFRecorder is outputting 4 Volts Note that Vad1 and Vad4 must be measured when the data acquisition system is fully hooked up and the AFRecorder is fully hooked up and the AFR sensor is on Simu...

Page 47: ...r pins Not connected Cable Use straight through DB9 cable to computer Software AFRemote software for IBM PC compatible computer provided on 720 Kb 3 1 2 media General Information Power AC 100 120 VAC...

Page 48: ...or the negative terminal of the battery using braided cable may provide improved noise rejection in some environments Inside the AFRecorder there is a 2 2K resistor connecting the case ground and the...

Page 49: ...elations and atom balances However the degree to which an engine exactly matches these calculations is dependent on the degree to which the combustion has approached equilibrium or completeness This d...

Page 50: ...ads Figure 23 Engine Speed and Spark Timing Signals Engine speed RPM is determined by measuring the time t_rpm between successive active edges of the engine speed signal The calculation uses the numbe...

Page 51: ...aphragm is sealed with an internal vacuum reference and the other is acted on by the external pressure source The internal vacuum reference allows the unit to measure absolute pressure Signal processi...

Page 52: ...lso not averaged Should the AFRecorder detect an AFR outside of its measurement range less than 0 1 or greater than 2 5 it will display for too lean or for too rich The value recorded or stored real t...

Page 53: ...Theory of Operation 49 Figure 24 Measurement of Parameters by the AFRecorder...

Page 54: ...50...

Page 55: ...e AFRecorder displays xxxx V LO or an oscillating O2 reading when the AFR sensor is in stationary air Intermittent Engine Speed and or Spark Timing Measurements The magnetic engine speed pickup and th...

Page 56: ...1 if it calculates a spark timing outside of the range 60 deg BTDC to 30 deg ATDC or the programmed range if RPM PULSES 2 REV is greater than eight 8 This is usually caused by spark noise triggering t...

Page 57: ...noisy power The power can be corrupted if a timing light is powered by the same power supply 2 Excessive spark noise Spark noise can enter the AFRecorder via the AFR cable if it is placed too close t...

Page 58: ...54...

Page 59: ...a stopped engine it is best to think out your moves before you make them Route and cable tie all sensors cables and hoses away from hot moving sharp high energy spark and caustic objects Take into con...

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Page 61: ...whether express implied or arising by operation of law trade usage or course of dealing are hereby disclaimed LIMITATION OF REMEDY Seller s liability arising from or in any way connected with the item...

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Page 64: ...Los Altos CA 94023 0040 USA 408 734 3433 Fax 408 734 3432 www ecm co com...

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