The urea water solution injection control is critical for urea SCR systems to achieve high NO x conversion efficiency while keeping the ammonia (NH 3) slip at a required level. After the SCR is triggered, a closed-loop will be formed by the capacitor and SCR. Selective Catalytic Reduction (SCR) system is widely used for diesel nitrogen oxide (NO x) control, but the closed-loop control and adaptive correction method which based on NO x sensor signal will be affected by the working characteristics of NO x sensor, such as the cross-sensitivity of ammonia (NH 3 ). Mechanics Assistant: Whats the make, model, and year of your truck? 2019 Freightliner. The SCR-diode tends to generate undesirable harmonics and requires a higher start current. Original stated casuse was DEF buildup Dealer did a. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. DO NOT REPLACE EITHER NOx SENSOR FOR ANY OF THE ABOVE CODES. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Table 7. Optimizing Your Process with Scr Closed Loop Control to Reach Maximum Limit. SCR closed loop at maximum limit. Typical limits for ammonia slip are 10 ppm average and 30 ppm maximum. Maximum coverage ratio with 10 mol ppm of NH3-slip (x max ) and setpoint map (x sp ) as functions of temperature. Exhaust Temperature After SCR Pump Module Once the SCR temperatures have reached a minimum of 536°F (280°C), continue the remainder of this cycle with the high idle. Flow Target Error”, and “SPN: 520372, FMI: 16 – SCR Closed Loop Control At Maximum Limit. After mounting it back with a new gasket and bolts I performed parked regen and Nox efficiencies are about 90-95%. Scr Closed Loop Control to Reach >Optimizing Your Process with Scr Closed Loop Control to Reach. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Check as follows: WARNING ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Optimizing Your Process with Scr Closed Loop Control to Reach. In the case of an open-loop system, the resulting wash water is discharged back into the sea. Is the currentACM software and fuel map at or greater than the chart below? Yes; Go to step 3. The monitored Pump Module value will indicate when dosing starts. At high signal speeds, there is also a limit on the maximum rate of change of the output voltage. PDF FIELD SERVICE CAMPAIGN BULLETIN. Take screenshots of the graph and sensor values approximately 2-3 minutes prior to engine shutdown. Euro 7 Light Duty SCR System Solution with Software. Maximizing Benefits of Closed Loop Control Systems with a Maximum Limit Set. In practical terms then, the urea dosing control problem then becomes one of storing sufficient. SCR closed loop at maximum limit. For the example of Figure 8, the maximum SCR aftertreatment closed loop system bandwidth is less than 0. It is used to identify and address problems in a system and enable it to reach the highest operational efficiency possible. However, current commercially available NO x sensors are significantly sensitive to NH 3 (also referred to as the cross-coupling effect), which limits their use in feedback controls. Equilibria of the closed loop dynamics (11) and the eigenvalue λ 1 as functions of k L. Of all possible analog signals that can be used to transmit process information, the 4-20 mA loop is, by far, the dominant standard in the industry. Codes are active because of SCR closed loop control at maximum limit which was active due to low Nox efficiency. Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms. Codes are active because of SCR closed loop control at maximum limit which was active due to low Nox efficiency. 7L I6 CUMMINS TURBO DIESEL P249E-CLOSED LOOP SCR REDUCTANT INJECTION CONTROL AT LIMIT - FLOW TOO HIGH For a complete wiring diagram, refer to the Wiring Information. DO NOT REPLACE EITHER NOx SENSOR FOR ANY OF …. Development of Model Based Closed Loop Control Strategy of. In a single-phase unit, it fails to reduce the start current, although it controls the start torque. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Table 7. I have a freightliner with a detroit dd15 engine. Flow Target Error”, and “SPN: 520372, FMI: 16 – SCR Closed Loop Control At Maximum Limit. You basically need a fixed-size pool of download tasks. DD15 inducement lamp codes : r/DieselTechs. Frequency Response. SELECTIVE CATALYST REDUCTION CLOSED LOOP CONTROL AT MAXIMUM LIMIT (MULTIPLES SOURCES) DESCRIPTION The fault indicated High Diesel Exhaust Fluid (DEF) Delivery. At high signal speeds, there is also a limit on the maximum rate of change of the output voltage. Is DEF percentage between 31 and 34%? Yes; Go to step 3. Or it could be a bad scr all. a freightliner with a detroit dd15 engine. The forward breakover voltage limit of the SCR could be tested by increasing the DC voltage supply (with no pushbutton switch actuated) until the SCR latches all on its own. The forward breakover voltage limit of the SCR could be tested by increasing the DC voltage supply (with no pushbutton switch actuated) until the SCR latches all on its own. A chemical kinetic model of the SCR catalyst was established and validated to estimate the ammonia storage in the SCR catalyst. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. The SCR-only strategy was widely used in Europe to simultaneously meet the Euro IV/V limits for both NOx (3. This is a fault that sets when the after treatment system has an abnormal reading of DEF consumption. Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. By visual inspection I found that the def dozer was not. Improper current draw and speed regulation occurs if maximum frequency is not set to the proper motor requirements. Closed-loop systems add chemicals, such as caustic soda, to the wash water to boost its alkalinity. 520371 16 SCR closed loop control at maximum limit (Multiples Sources) 520372 16 SCR closed loop control at maximum limit 520372 14 SCR closed loop control at maximum limit (Timeout) 520378 0 Aftertreatment Temperature not plausible 520381 2 Diesel Oxidation Catalyst Inlet Temperature Signal not plausible. Development of Model Based Closed Loop Control Strategy of SCR …. everything im reading online says it just needs a system update. TYPICAL ENABLING CONDITIONS Closed Loop DEF Dosing. Inlet and outlet sensors calculate the efficiency, so make sure both sensors are good. Is it going to modify the fuel by 25% or 5%? Likewise, if the the closed loop limit is set at -5% and the learn limit is set at -25% and the o2 is calling for a -50% adjustment. This issue is why this unit is not suitable for applications that handle high inertial loads or frequent cycling. If 40 dB of gain margin is needed with a closed-loop gain of 20 dB, an amplifier having the response shown in the figure above can be used only up to 1 kHz, while if 20 dB is satisfactory, then the frequency can be extended to 10 kHz. SCR Aftertreatment Systems >Model. Though the cost of exhaust gas (NO x or NH 3) sensors is high, these sensors are necessary for SCR closed-loop control. In practical terms then, the urea dosing control problem then becomes one of storing sufficient ammonia on the SCR catalyst to achieve the required emission targets while limiting ammonia slip to the required limits. Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. However, in recent years, researchers have focused on studying the control strategy based on NO x sensor feedback but there are few reports about NH 3 -based closed-loop control strategy. Equilibria of the closed loop dynamics (11) as function of k L (T = 250 °C, ω = 200 mol ppm, v = 4. The system is showing that too. Interpreted coverage x c as a function of x (taken at equilibrium), for T = 250 •. Though the cost of exhaust gas (NO x or NH 3) sensors is high, these sensors are necessary for SCR closed-loop control. At some frequency (often below 10 Hz as in this case) the gain begins to fall off, usually at 6 dB per octave. Optimizing Your Process with Scr Closed Loop Control to Reach …. The results of the NOx Conversion test do not indicate anything about the condition of the SCR itself. Working with open or closed loops. 5/2 g/kWh, respectively) and for PM (0. (PDF) Ammonia Sensor for Closed. Max closed loop gain of an op. SCR closed loop control at maximum limit permanent code 520372. Original stated casuse was DEF buildup Dealer did a Ask an Expert Car Questions Medium and Heavy Trucks Found 1 result (s) for your search SCR closed loop control at maximum limit. The urea water solution injection control is critical for urea SCR systems to achieve high NO x conversion efficiency while keeping the ammonia (NH 3) slip at a required level. The forward breakover voltage limit of the SCR could be tested by increasing the DC voltage supply (with no pushbutton switch actuated) until the SCR latches all on its own. National Highway Traffic Safety Administration. This is quantitatively described by the phase margin (distance to the stability limit expressed in degree phase shift). There are approximately 457 engines affected by this Field Service Campaign. Scr Closed Loop At Maximum Limit A closed-loop at maximum limit is an analytical procedure that helps regulate the throughput of a system. Flow Target Error, and SPN: 520372, FMI: 16 - SCR Closed Loop Control At Maximum Limit. Maximizing Benefits of Closed Loop Control Systems with a Maximum Limit …. After mounting it back with a new gasket and bolts I performed parked regen and Nox efficiencies are about 90-95%. Use the chart below to verify the Aftertreatment Control Module (ACM) software level is up to date. Closed-loop control seems an attractive option to meet the formulated goals. During the rotate autotune, it requires the motor to run to the frequency in P032 [Motor NP Hertz]. 521049/31 DEF inducement DEF lamp and 520372/16 scr closed loop control at maximum limit. SELECTIVE CATALYST REDUCTION CLOSED LOOP CONTROL AT MAXIMUM LIMIT (MULTIPLES SOURCES) DESCRIPTION The fault indicated High Diesel Exhaust Fluid (DEF) Delivery. At the 1600 RPM engine speed for this operating condition, the exhaust pulsating characteristic frequency is 13. A scrubber sprays seawater or fresh water mixed with a caustic chemical into the exhaust gas stream in several stages. Please advise on repair procedures. High NO x conversion in combination with acceptable NH 3 slip can be realized. Mechanics Assistant: Is there anything else the truck Mechanic should know before I connect you? Rest assured that theyll be able to help you. Field Service Campaign Bulletin D18M2 Page Two Engines Involved A list of engines located in your area of responsibility that require this correction. When the SCR is in blocking mode, the capacitor charges to the full supply voltage. The invention relates to a computing method, in particular to an SCR system closed-loop control computing method and belongs to the technical field of aftertreatment systems of diesel engines. the condition of the SCR itself. Selective Catalyst Reduction Closed Loop Control at Maximum Limit (Multiples Sources) Table 1. Exhaust Temperature After SCR Pump Module Once the SCR temperatures have reached a minimum of 536°F (280°C), continue the remainder of this cycle with the high idle. The open-loop gain of an operational amplifier varies with frequency. Allow dosing to occur for a minimum of 15 minutes. Closed Loop Control Systems with a >Maximizing Benefits of Closed Loop Control Systems with a. Soft starter 101: How do they work?. However, closed-loop control is needed to make the. Flow Target Error”, and “SPN: 520372, FMI: 16 – SCR Closed Loop Control At Maximum Limit. MicroFUSION is an ultra-compact high-performance digital SCR controller that adapts to the analog environment as well as the digital environment. 5841 FMI 14, SPN 521049 FMI 31, SPN…>SPN 52105 to FMI 31, SPN 5841 FMI 14, SPN 521049 FMI 31, SPN…. MONITORED PARAMETER NOx Conversion Efficiency. Turn the ignition on (Key ON / Engine OFF) and wait one minute, then start the engine and run a Parked SCR efficiency test. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Table 7. DETROIT LOOP CONTROL AT MAXIMUM LIMIT (MULTIPLES SOURCES). Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. CLOSED LOOP SCR REDUCTANT INJECTION CONTROL AT LIMIT >P249E. A control problem of interest for the SCR system consists of managing the injection of the urea solution in order to maximize the NO x. The SCR-only strategy was widely used in Europe to simultaneously meet the Euro IV/V limits for both NOx (3. As major as the 4-20 mA loop standard has become in the process control industry, many do not understand the fundamentals of its setup and use. 520371 16 SCR closed loop control at maximum limit (Multiples Sources) 520372 16 SCR closed loop control at maximum limit 520372 14 SCR closed loop control at maximum limit (Timeout) 520378 0 Aftertreatment Temperature not plausible 520381 2 Diesel Oxidation Catalyst Inlet Temperature Signal not plausible. An open loop design does not provide any current feedback loop. SCR doser valves and still have P3844…>Replaced both DEF and SCR doser valves and still have P3844…. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. For this purpose, it is important. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. >MicroFUSION Single Phase. Closed-loop motor control is one of the most common way to regulate the output speed of the motor’s varying load conditions. The overall structural diagram of HP. The engines were calibrated for low PM emission levels, below 0. A control problem of interest for the SCR system consists of managing the injection of the urea solution in order to maximize the NO x conversion while maintaining release of NH 3 within acceptable levels (peaks limited to 30 mol ppm, average value less than 10 mol ppm). SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. 7L I6 CUMMINS TURBO DIESEL P249E-CLOSED LOOP SCR REDUCTANT INJECTION CONTROL AT LIMIT - FLOW TOO HIGH For a complete wiring diagram, refer to the Wiring Information. the condition of the SCR itself. Due to this, a sudden high current flows through SCR. As a general rule, we must state that stability properties of closed-loop configuration have become worse if compared with open-loop conditions. Diesel Engine SCR Control: Current Development and Future. The o2 is wanting -50% adjustment. Make sure your DPF system is operating normally. Scr Closed Loop At Maximum Limit A closed-loop at maximum limit is an analytical procedure that helps regulate the throughput of a system. It can also be said that if (dV/dt) increases beyond the specified value, then it leads to false triggering of thyristor which is undesired. 1 2015 - DJ - RAM 2500 PICKUP - 6. Check the DEF quality by using the refractometer from the DEF Test Kit W060589001900 to measure the DEFpercentage. The SCR-diode tends to generate undesirable harmonics and requires a higher start current. High NO x conversion in combination with acceptable NH 3 slip can be realized with an open-loop control strategy. The stable equilibrium points are. Scr Closed Loop At Maximum LimitDevelopment of Model Based Closed Loop Control Strategy of >Development of Model Based Closed Loop Control Strategy of. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Table 7. If new reagent dosage systems and future catalyst technology. Typical limits for ammonia slip are 10 ppm average and 30 ppm maximum. Development of Model Based Closed Loop Control Strategy of SCR System for Heavy-Duty Diesel Engines 2017-01-2383 Urea selective catalytic reduction (SCR) is. Maximizing Benefits of Closed Loop Control Systems with a …. Scr closed loop control at maximum limit dd15>Scr closed loop control at maximum limit dd15. Development of Model Based Closed Loop Control Strategy of …. A soft starter either runs an open or closed loop. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. Closed-loop control seems an attractive option to meet the formulated goals. 33 Hz which is 2 orders of magnitude higher than the bandwidth of the closed loop system. As a general rule, we must state that stability properties of closed-loop configuration have become worse if compared with open-loop conditions. Is it going to modify the fuel by -25% or -5%?. PowerFlex 525 Configuration with Permanent Magnet Motors>PowerFlex 525 Configuration with Permanent Magnet Motors. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. Open-loop scrubbers Open-loop systems use seawater, which is alkaline by nature, to wash the SO X out of the exhaust. A guide to taking screenshots can be found in solution. Thus, these units provide the best control of both the torque and the current. Closed-loop control seems an attractive option to meet the formulated goals. SCR Systems for Diesel Engines. Scr Closed Loop At Maximum Limit A closed-loop at maximum limit is an analytical procedure that helps regulate the throughput of a system. It is used to identify and address problems in a system and enable it to reach the. This study deals with the potential and limitations of closed-loop SCR control. Due to the presence of the voltage across the capacitor, due to the closed path, the capacitor discharges. SCR closed loop control at maximum limit permanent code 520372. Scr Closed Loop At Maximum Limit A closed-loop at maximum limit is an analytical procedure that helps regulate the throughput of a system. Zoom on x axis, close to the singularities of λ 1. If the rate of rise of forward anode voltage exceeds the specified maximum limit, then it causes switching from OFF state to ON state. SCR closed loop control at maximum limit permanent code 520372. Equilibria of the closed loop dynamics (11) as function of k L (T = 250 °C, ω = 200 mol ppm, v = 4. 000oph on a field test carrier operating on heavy fuel oil (HFO) and its compliance with IMO regulations by receiving the first IMO. In areas and ports where open. Although the question states your reluctance to go down that route, the code ends up much more elegant:. If you have a DOC/DPF problem, then this could lead to other issues with being in derate and causing a critical soot level and limit you to 5MPH. SCR closed loop at maximum limit. By visual inspection I found that the def dozer was not mounted to the one box. A scrubber sprays seawater or fresh water mixed with a caustic chemical into the exhaust gas stream in several stages. This system works by setting maximum limits on the process parameters, such as flow rate and temperature, so that they can be controlled within specific ranges. the condition of the SCR itself. 02 g/kWh, while engine-out NOx was elevated to about 9-11 g/kWh. Four different powertrain topologies of the HEV system are considered to identify the optimal balance between the fuel consumption improvement and the. Codes are active because of SCR closed loop control at maximum limit which was active due to low Nox efficiency. 1 2015 - DJ - RAM 2500 PICKUP - 6. National Highway Traffic Safety Administration. As a result, the closed-loop control strategy has remarkable performance in further reducing NO x emission without NH 3 leakage exceeding the limit. SCR closed loop control at maximum limit. A guide to taking screenshots can be found in THIS solution. Replaced both DEF and SCR doser valves and still have P3844…. The urea water solution injection control is critical for urea SCR systems to achieve high NO x conversion efficiency while keeping the ammonia (NH 3) slip at a required level. National Highway Traffic Safety Administration. SCR Systems for Diesel Engines>SCR Systems for Diesel Engines. At some frequency (often below 10 Hz as in this case) the gain begins to fall off, usually at 6 dB per octave. If P044 [Maximum Freq] is not set above P032 [Motor NP Hertz], the autotune fails. Moreover, the model includes a simplified virtual engine model and a virtual ECU to allow closed loop simulation of the engine + control + aftertreatment for various LNT/SCR control strategies. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. For this purpose, it is important to know the NH 3 levels in both catalysts as precisely as possible. In general, an open loop control strategy is sufficient for SCR systems to satisfy Euro IV and Euro V NO x emission limits. I have 3 codes. In PTT, run Operation 2549-08-03-03 NOx Conversion, located under the Test tab. This study deals with the potential and limitations of closed-loop SCR control. Please help to get home:(. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Check as follows: WARNING ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Check as follows: Connect DiagnosticLink ®. Considering that active urea-SCR systems may be required to ensure compliance with the legislative limits, the total cost of the hybrid Diesel powertrain is expected to increase even more, therefore making it less commercially attractive. Lets say closed loop limit is set at -25% and learn limit is set at -5% at any given cell. In general, an open loop control strategy is sufficient for SCR systems to satisfy Euro IV and Euro V NO x emission limits. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. Snubber Circuit – its Necessity, Design and Working. Or it could be a bad scr all together. A slope of 6 dB per octave is used because it provides the basis for stability when feedback is applied properly; this comes about because the maximum phase shift is about -90° for all gains from 100 to 0 dB (10 5 to 1). SPN 52105 to FMI 31, SPN 5841 FMI 14, SPN 521049 FMI 31, SPN…. asyncio doesnt come with a pre-made task pool, but it is easy to create one: simply keep a set of tasks and dont allow it to grow past the limit. This system works by setting maximum limits on the process parameters, such as flow rate and temperature, so that they can be controlled within specific ranges. Selective Catalyst Reduction Closed Loop Control at Maximum Limit (Multiples Sources) Table 1. I dont think u are going to be able to clear it without the detroit software Attached Files: Screenshot_20200905-140430. SPN 520372 / FMI 16 - SCR closed loop at maximum limit fault. This work proposed an approach to achieve model based closed loop control for SCR systems to meet the Euro VI NO x emission limits. This study deals with the potential and limitations of closed-loop SCR control. Use the chart below to verify the Aftertreatment. In PTT, run Operation , located under the Test tab. Closed-loop systems add chemicals, such as caustic soda, to the wash water to boost its alkalinity. Scr Closed Loop At Maximum Limit A closed-loop at maximum limit is an analytical procedure that helps regulate the throughput of a system. Selective Catalyst Reduction Closed Loop Control at Maximum Limit (Multiples Sources) Table 1. Beware that a breakover test may require very high voltage: many power SCRs have breakover voltage ratings of 600 volts or more!. The MAN SCR System – More Than Just Fulfilling IMO Tier III. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. Unlike the single- and two-phase unit, three-phase units are capable of providing full and maximum control. How to limit concurrency with Python asyncio?. SCR closed loop at maximum limit. Considering that active urea-SCR systems may be required to ensure compliance with the legislative limits, the total cost of the hybrid Diesel powertrain is expected to increase even more, therefore making it less commercially attractive. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. It can be high at low frequencies but decreases rapidly above some frequency which is characteristic of the particular amplifier. Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. SCR closed loop control at maximum limit. Or it could be a bad scr all together. SCR closed loop at maximum limit. A SCR reaction is a kind of gas-solid multiphase reaction, which occurs on the surface of the catalyst and mainly includes the standard SCR reaction, the fast SCR reaction, the slow SCR. EXECUTION FREQUENCY Always Enabled. Mechanics Assistant: Whats the make, model, and year of your truck? 2019 Freightliner Cascadia. • When Monitored: This monitor runs when the engine is running and diesel exhaust fluid dosing is being commanded. P249E-CLOSED LOOP SCR REDUCTANT INJECTION CONTROL AT LIMIT - FLOW TOO HIGH For a complete wiring diagram, refer to the Wiring Information. SCR closed loop at maximum limit. Use DiagnosticLink to clear the code. Moreover, the model includes a simplified virtual engine model and a virtual ECU to allow closed loop simulation of the engine + control + aftertreatment for various LNT/SCR control strategies. Maximizing Benefits of Closed Loop Control Systems with a. This is a fault that sets when the after treatment system has an abnormal reading of DEF. Of all possible analog signals that can be used to transmit process information, the 4-20 mA loop is, by far, the dominant standard in the industry. SCR catalyst dynamics, time delay in the urea injection and maximum NH 3 slip targets limit the performance of closed-loop SCR control. If new reagent dosage systems and future catalyst technology are able to relieve these limitations, closed-loop control has the potential to reduce the calibration effort and to improve the transient control. Turn the ignition on (Key ON / Engine OFF) and wait one minute, then start the engine and run a Parked SCR efficiency test. Back to Basics: The Fundamentals of 4. Since 2016, requirements have been set by the International Maritime Organization (IMO) for seagoing vessels, which enter the North American coast as well as parts of Canada and the Caribbean Seas,. Based on the model, a PI controller was designed to control the ammonia storage in the. In the case of an open-loop system, the resulting wash water is discharged back into the sea. However, current commercially available NO x sensors are significantly sensitive to NH 3 (also referred to as the cross-coupling effect), which limits their use in feedback controls. Though the cost of exhaust gas (NO x or NH 3) sensors is high, these sensors are necessary for SCR closed-loop control. What Does ‘SCR NOx Conversion Efficiency Low’ Mean On …. The MAN SCR system has proven its reliability by more than 15. The SCR-only strategy was widely used in Europe to simultaneously meet the Euro IV/V limits for both NOx (3. Engine SCR Control: Current Development and Future >Diesel Engine SCR Control: Current Development and Future. ” There are approximately 457 engines affected by this Field Service Campaign. Selective Catalyst Reduction Closed Loop Control at Maximum Limit Check as follows: WARNING ENGINE EXHAUST To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. The controller features the following: Auto-ranging input voltage (CE: 24-690 VAC, UL: 24-600 VAC, 45-65 Hz) 16, 32, 50, 80, 100, 130, 160, 200, 240, 320, 400 Amp AC output (at 50° C, 6000 ft). Equilibria of the closed loop dynamics (11) and the eigenvalue λ 1 as functions of k L. I dont think u are going to be able to clear it without the detroit software Click to expand I read the same. The results of the NOx Conversion test do not indicate anything about the condition of the SCR itself. Max Limit CLOS is a type of closed loop control system that is used in many industrial processes to maintain accuracy and reduce variability. The pollutant – mainly sulphur dioxide – reacts with the alkaline water, forming sulphuric acid. Exhaust Temperature After SCR Pump Module Once the SCR temperatures have reached a minimum of 536°F (280°C), continue the remainder of this cycle with the high idle. In order to achieve robustly high efficiencies, closed-loop control is required that takes into account the system architecture of the two-stage SCR system. The wash water is then recirculated through the system and partially purged.