2) Compatibility of CDPF System by Vehicle Model
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1 (EURO IV) OVERVIEW FOR (EURO IV) 1) General Description The (Catalyst & Diesel Particulate Filter) was installed to the Rexton II D27DTP engine previously. However, it is now installed to the all 2009 DI engine models, except the Actyon Sports. The DI engine type sinstalled to Rexton are D27DTP, D27DT and D20DT, and their, related sensor and operation logic are the same.this section describes the system (based on Euro IV) which is installed to the Rexton II D27DTPengine (older model). 2) Compatibility of System by Vehicle Model Rexton II: Same system for D27DTP and D27DT engines (including its components) Kyron & Actyon: Same system for D27DT and D20DT engines (including its components) - The assemblies installed to the Euro IV D27DTP Rexton II and 2009 Rexton II are different in their mounting layout, but their front/rear exhaust temperature sensors and differential pressure sensors are same. 3) System Met with EURO IV Regulations The Ssangyong vehicles installed with the D27DT engine manufactured from July 2007 to December 2007 comply with the EURO IV regulations. Modified components from the old engine model are as follow: - E-EGR valve - EGR cooler - Engine ECU (Ver. 3.2) - HFM senso - C3I injector - Electronic throttle valve (body) - Other engine mounting components For details about the modified components and system related to the EURO IV regulations, refer to the 2008 Rodius engine service manual.
2 (EURO IV) SYSTEM The system is only installed to the D27DT engine, and the major changes comparing to the previous D27DT engine is as follows: (Catalyst & Diesel Particulate Filter) and Sensors Differential Pressure Sensor (ΔP sensor) Under air cleaner in right side of engine compartment As the soot is filtered in the, the pressure between the front side and the rear side of the filter is different from each other. If the amount of soot is over 28 g, the soot is burnt in the. The combustion is determined depending on the pressure difference, temperature of exhaust gas and EGR ratio. According to these, the soot filtered by post injection of injector is burnt at 600 C. Front exhaust gas temperature sensor Exhaust Gas Temperature Sensor The two temperature sensors in-side the are installed inexhaust manifold (front exhaustgas temperature sensor) and indoc (rear exhaust gas tempera-ture sensor), and perform the fol-lowing functions. Front Exhaust Gas Temperature Sensor: Measures the exhaust gas temperature of the exhaust manifold. As it is installed in front of the VGT turbocharger, it also monitors the exhaust gas tempera-ture coming to the turbocharger. If the temperature of the exhaust gas flowing to the turbocharger is higher than the specification, the engine lowers the exhaust gas temperature. Rear Exhaust Gas Tempera-ture Sensor: Measures the increased exhaust gas temperature after the oxidation process of DOC. If the temperature is below 600 C, the post injection amount is increased to increase the temperature.
3 Throttle Body system controls the amount of intake air by controlling the electronic throttle body. The electronic throttle body has the following main functions. control - added a function that increases the exhaust gas temperature by closing the throttle valve flap to minimize the intake air amount by the fuel injection amount during the regeneration range with the low engine load range. ON/OFF control - prevents the engine from turning off with vibration and noise by closing the throttle body flap to block the intake air when the engine is stopped. Duty control - controls the valve inside the throttle body to burn more EGR gas in the EGR valve operating range. VGT Turbocharger and Front Exhaust Gas Temperature Sensor Turbocharger may become weaker if high temperature exhaust gas passes through the turbocharger for DPF regeneration process. The front exhaust gas temperature sensor monitors the temperature of the exhaust gas that flows into the turbocharger. If the temperature of the exhaust gas that passes through the exhaust manifold is higher than the specification, the ECU decreases the fuel injection amount and increases the EGR gas intake amount to decrease the exhaust gas temperature. Front exhaust gas temperature sensor
4 OVERVIEW As the solution for environmental regulations and PM (Particla Material) of diesel engine, the low emission vehicle is getting popular. This vehicle is equipped with an extra filter to collect the soot and burn it again so that the amount of PM in the exhaust gas passed through the DOC (Diesel Oxydation Catalyst) is reduced. The (Catalyst & Diesel Particulate Filter) is anintegrated filter including DOC (Diesel Oxydation Catalyst) and DPF (Diesel Particulate Filter). Comparison of throttle body functions based on exhaust emission regulation Regulated parts are carbon monoxide (CO), nitrogen oxide (NOx), particular matter (PM) and soot in the exhaust emission, and the particulars of the regulations are prescribed in the following table.
5 (EURO IV) SYSTEM CONTROL 1) General Description As the soot is filtered in the, it is burnt and removed, and the is returned to the initial state to collect the soot. Therefore, the burning procedures in the can be called as regeneration. The assembly is integrated with DOC (at front side) and DPF (at rear side). The DPF burns the soot with high-temperature exhaust gas (over 600 C). The rear exhaust gas temperature sensor monitors the temperature of DPF section. If this temperature is below the regeneration temperature, the ECU increases the post injection period to increase the fuel injection amount, and consequently to increase the exhaust gas temperature. Front exhaust gas temperature sensor (Measuring temperature of exhaust gas in exhaust manifold) Rear exhaust gas temperature sensor (Measuring temperature of exhaust gas escaping DOC) - Normally, when the vehicle is driven for 600 ~ 1,200 km, the enough amount of soot to be burnt is filtered and accumulated in the. The ECU increase the amount of post injection to increase the tempeature of exhaust gas up to 600 C so that the soot is burnt. The soot is burnt for 15 ~ 20 minutes.
6 ) System Composition for Soot Combustion When the engine is running in low load range, the temperature of exhaust gas is decreased as the amount of fuel supplied is decreased. To burn the soot filtered in the, the control system should be installed to check the operating range and increase the temperature of exhaust gas by controlling the amount of fuel supplied and intake air. Two temperature sensors and one differential pressure sensor monitor the 's operating range. According to these sensors' information, the throttle flap decreases the intake air entered to the throttle body. Also, the fuel injection pattern is added to increase the temperature of exhaust gas for soot combustion. There are three fuel injection patterns (pilot injection, pre-injection and main injection). As the is installed, the post injection pattern is added. 3) Post Injection and Air Mass Control When the differential pressure sensor detects the pressure difference between the front and the rear side of, the sensor sends signal indicating the soot is acumulated and the post injection is performed to raise the temperature of exhaust gas. The amount of fuel injected is determined according to the temperature of exhaust gas detected by the rear temperature sensor. If the temperature is below 600 C, the amount of fuel injected is increased to raise the temperature. If the temperature is over 600 C, the amount of fuel injected is decreased or not controlled. When the engine is running in low load range, the amount of post injection and the amount of intake air are controlled. It is to raise the temperature by increasing the amount of fuel while decreasing the amount of intake air.
7 Throttle bodies by engine type - The throttle valve is controlled by electric signals sent from the engine ECU for optimal fuel injection volume, engine load and effective combustion of EGR gas according to the Euro 4 regulations. It has following functions by the engine type.
8 SOOT FILTERING AND BURNING PROCEDURES 1) Operating Procedures of The most efficient and practical technology for now is adopted to the diesel particulate filter (DPF). This system collects the soot from the diesel engine to the filter and burns the soot so that over than 95% of soot can be removed from the exhaust gas. However, the durability and the cost of additional system remainas problems. Firstly, the exhaust gas is passed through the DOC and its temperature is increased as it is oxidized. The ECU detects the temperature change with two temperature sensors. The CO, HC and partial particulate material are removed from the exhaust gas (this procedures are the sames as the ones for the conventional DOC and no sensor is required). After the exhaust gas is passed through the DOC and oxidized, most of the harmful material is removed from the exhaust gas. However, to meet the environmental regulations in the future, the soot is filtered and burnt again in DPF to decrease the particulate material further. Exhaust gas Rear exhaust gas temperature sensor(measuring temperature of exhaust gas escaping DOC) - The filtered soot is burned whenever the vehicle is driven for 600 ~ 1200 km. The driving distance can be differed depending on the vehicle s driving conditions. The soot is burnt for 15 ~ 20 minutes.
9 Front temperature sensor (Measuring the temperature of exhaust gas passedthrough exhaust manifold) Rear temperature sensor (Measuring the temperature of exhaust gas passed through DOC) Differrential pressure sensor (Front pressure port) Differrential pressure sensor (Rear pressure port) The exhaust gas enters into assembly after passing through the exhaust manifold. (Normal temperature of ex-haust gas: approx. 250 C) When the exhaust gas enters into the assembly, its CO, HC and particulate mate-rial are reduced as it is oxidized in DOC. The remaining particulate material is filtered and collected in DPF and the temperature of exhaust gas is increased to approx. 450 ~500 C. The engine ECU detects the amount of particulate material colected by the information from temperature sensors and differential pressure snesor. When the soot is accumulated, the pressure difference be-tween the front and the rear side occurs. Then, the engineecu performs the post injec-tion to raise the exhaust gas temperature and burn the collected soot at approx. 600 C.
10 ) Fuel Injection During Regeneration 3) Warning Lamp Related To regeneration process (warning lamp NOT illuminated) The system enters the regeneration mode when the driving distance becomes approx. 600 to 1,200 km (may differ by the driving condition and driving style). Then, the engine ECU performs the regeneration operation. However, the driver is not in-formed with this operation by any engine warning lamp or vehicle signal, so he/she may not detect this operation. The control logic at the post-injection dur-ing the regeneration process is to increase the fuel injection volume and control the intake air volume (by the throttle body) in order to increase the tem-perature of the exhaust gas. The driver may not feel any particular difference from the vehicle.
11 Overload of (warning lamp blinking) 1. If the cannot reach the regeneration temperature due to low speed driving or other reason during the regeneration process, the soot is continuously accumulated in the. When this condition continues and the is overloaded with soot, the engine warning lamp blinks to in-form this situation to the driver. 2. In order to solve this problem, drive the vehicle at a speed of approx. 80 km/h for 15 to 20 minutes to perform the regeneration process. 3. If the engine warning lamp on the instrument clus-ter blinks, the is overloaded. In this case, perform the step 2. Excessive overload of (warning lamp illuminated) 1. If the vehicle is driven at a speed of 5 to 10 km/h for an extended period of time, the soot accumu-lated in the cannot be burnt as the cannot reach the regeneration temperature. Then, an excessive amount of soot can be accumulated in the 2.. This case is much worse than the simple over-load of the. To inform this to the driver, the engine warning lamp comes on and the engine power is 3. decreased to protect the system. To solve this problem, blow soot between the engine and exhaust system several times and erase the related DTC. Then, check if the same DTC is regenerated again. If so, check the DTC related to the differential pressure sensor. Actually, the DTC for the is generated more often by the component related to the system, such as the differential pressure sensor, than by excessive soot in the.
12 COMPONENTS OF SYSTEM 1) Mounting Condition and Location Differential Pressure Sensor Engine compartment (RH) Rear exhaust gas temperature sensor Rear pressure port Front pressure port Differential pressure sensor assembly Front Exhaust Gas Temperature Sensor Throttle Body Front exhaust gas temperature sensor
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