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Operating Instruction
STAG AFR
Wideband Oxygen
Sensor Controller
)
(instruction available also in the AC AFR software and at
www.ac.com.pl
ver. 1.1
2014-12-11
AC S.A. All rights reserved. Any unauthorized copying, reproduction, publishing, dissemination, disclosing or other use of information presented herein, in whole or as part, particularly photographs,
drawings, trademarks, etc., may lead to prosecution or civil proceedings.
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Table of Contents
Summary of Contents for Stag AFR
- Page 1 Operating Instruction STAG AFR Wideband Oxygen Sensor Controller (instruction available also in the AC AFR software and at www.ac.com.pl ver. 1.1 2014-12-11 AC S.A. All rights reserved. Any unauthorized copying, reproduction, publishing, dissemination, disclosing or other use of information presented herein, in whole or as part, particularly photographs,...
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Page 2: Table Of Contents
5.7 "Update" window ..............................12 5.8 "About the program" window ......................... 13 Guidelines for use of the STAG AFR controller ..................13 6.1 Adjustment of LPG/CNG systems in gasoline engines ................13 6.2 Adjustment of LPG/CNG direct injection in spontaneous combustion engines ....... 14 Technical data .............................. -
Page 3: Wiring Diagram For Stag Afr Connection
ATTENTION! STAG AFR is an alternative to expensive exhaust gas analyzers. Due to high-speed measurements of lambda parameter (AFR - air-fuel ratio), it is possible to control air-fuel mixture not only in steady but also in transient engine operating states... -
Page 4: Installation
STAG AFR is provided with an analogue 0V to 5V output. It can be used to connect an external AFR indicator, as well as chassis dynamometers with an analogue input for the AFR reading, external data loggers and standalone/piggyback type ECM units. -
Page 5: Lambda Probe Mounting Location
The wideband oxygen sensor that comes with the kit is factory calibrated and requires no periodic calibration. If the probe requires to be replaced, the sensor of the same code (0 281 004 026) should be used. The use of improper sensor will damage it. Before mounting remove the transport protective plastic cap from the sensor. -
Page 6: Mounting By Using The Exhaust Gas Guiding Pipe
turbocharger, as exhaust gas pressure variations upstream the turbocharger may cause a false reading. The sleeve should be placed at the maximum available distance from the cylinder head, and in turbocharged engines - from the turbocharger (50 cm minimum). Otherwise, the oxygen sensor can overheat and fail! When the probe is installed too close to the cylinder head it may overheat and fail! A gap of at least 50 cm should be kept. - Page 7 For both studies the composition of the mixture only at maximum engine load (e.g. calibration of sequential autogas systems or fuel feed system equipped with a wideband oxygen sensor, where the air- fuel ratio at low and partial engine load is controlled by the engine controller), when the exhaust gas stream is strong, as well as the measurement at idle and at low engine loads when the ambient air might disturb the measurement at low gas flow, shown in (Fig.
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Page 8: Ac Afr Application
5.2. AC AFR Application version NThe version of AC AFR Application is shown at the top of the program screen. In Figures 6 to 11 the program in version 1.0.0 is presented. 5.3. Main menu Figure 6. -
Page 9: Gauge" Tab
5.4 "Gauge” tab Figure 7. Main window ("Gauge" tab). The Gauge tab contains a dial indicator of the measured value (default: AFR - lambda parameter) and corresponding numerical value is displayed below it. The dial indicator has colour-coded ranges that facilitate visual evaluation of the air-fuel ratio with no necessity to read an accurate value. -
Page 10: Graph" Tag
Green – rich mixture, for engines with factory installed oxygen sensors, the value within this range is correct at maximum engine load only, otherwise such values may occur at any engine load and rpm, Yellow – stoichiometric mixture (air-fuel ratio ensuring complete fuel combustion), for engines with factory installed oxygen sensors, the value within this range is correct at low and partial engine loads, ... -
Page 11: Settings" Window
Fuel – used to indicate what fuel type is currently fed to the engine (only for computing AFR), Sensitivity – when the oxygen sensor is installed to close to engine exhaust valves, the result of measurement may change too rapidly, thus making its interpretation difficult;... -
Page 12: Update" Window
5.7 "Update" window Figure 10. "Update" window The software version of the controller being currently connected is displayed in upper part of the window. The list of available updates is presented in table below To load an update file from outside of the program catalogue, press the "Load"... -
Page 13: About The Program" Window
6. Guidelines for use of the STAG AFR controller In gasoline engine, the optimum air-fuel mixture composition (AFR - Air/Fuel Ratio) is one gram of fuel per 14.7 grams of air. For this ratio, all oxygen available in supplied air is theoretically used to completely burn all of the fuel. -
Page 14: Adjustment Of Lpg/Cng Direct Injection In Spontaneous Combustion Engines
6.2 Adjustment of LPG/CNG direct injection in spontaneous combustion engines Diesel engines are adapted to be fed with a lean mixture. To measure composition of very lean mixtures occurring at low and medium loads, it is necessary to observe oxygen content (in %) in exhaust gas (the "Measured value"...
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