TW434367B - A method and device for an EGR-system and a valve as well as a regulation method and device - Google Patents

Abstract

The invention is related to a method and a device for recirculation of a part of exhaust gases from an exhaust pipe (6, 9) of a diesel engine (1) to the inlet of the engine, the exhaust gases being diverted from the exhaust pipe (6, 9) and directed through a recirculation conduit (10) to a controllable valve device (12) arranged between the engine and the air intake (2) thereof for allowing supply of air/recirculated exhaust gases in a desired relation to the combustion chamber of the engine (1). The invention also relates to a particular valve having two controllable inlets, said valve being useful in the method or device according to the invention, and a regulation method and device for regulating the air/fuel relation of a diesel engine.

Description

DESCRIPTION OF THE INVENTION (1) The invention relates to a method and device for an EGR system (exhaust gas recirculation system), especially for use in a diesel engine. The invention is also related to a vessel ', especially suitable for the method and apparatus according to the present invention, but the valve body can be used in other fields. Finally, the invention also relates to a method and apparatus for regulating a diesel engine.

In order to reduce the content of harmful exhaust gases, especially nitrogen oxides (NOx), the so-called Egr system has been used in many combustion engines for many years. This system allows a part of the exhaust gas to be recycled to the engine inlet system. The air inlet is mixed 'and further transmitted to the engine's control room.' The recirculated exhaust gas replaces a part of the air inlet and has a minus effect on the information. The so-called EGR system is then placed in a position connected to the exhaust system of the engine, the purpose of which is that the valve body can regulate the amount of recirculated exhaust gas. The methods and devices described before the characteristic parts of the proposed patent applications ranging from 1 to 6 have been found in DE A1 4 007 51 6. However, this conventional technique makes it possible to use an EGR system in a supercharged diesel engine, where the pressure downstream of the introduction system of the turbocharger is higher than the pressure in the recirculation line from the Egr valve. There is an essential disadvantage in this conventional technique. Therefore, 'the valve device includes separate dampers arranged in the EGR recirculation channel and the air inlet channel, and separate drive motors are provided for these dampers'. This design makes the valve device quite complicated and makes the control device quite equivalent. Complex "Object of the invention The main object of the present invention is to provide a method which can be more reliable

4 4

V. Description of the invention (2) and a simple way to adjust the air / recycling waste invention ", the purpose of which is to simplify the installation of the clothes, Λ is a more reliable and simple control method for the second supply. The valve device is as the present invention The second purpose is to provide a valve body, which is suitable for the flow of the channel. The body is suitable for general purposes, especially: In the ERG system used, it includes the super-inflatable two-inlet diesel engine with EGR system. . And the device to modify the invention is summarized by Shen ’s main purpose. There is a reliable operation shared by the head of the invention. The application of the invention can be achieved based on the use of the engine so that not only the engine is defined in the scope of the patent claims 1 to 6. The characteristics of the invention are achieved. The design of the valve body of the present invention includes two dampers, at least in an opened state, and the other damper can be closed by a damper driving motor ', which provides a simple operation. The valve body defined by the characteristic part in the patent scope 13 can achieve the second object 'The method defined by the characteristic part of the patent scopes 16 and 18 and the third object of the present invention can be achieved. Therefore, the design concept of the present invention is to detect and connect a sensor for a control device for a valve device to adjust the relationship between air / recycled exhaust gas, and also adjust the relationship between gas / fuel. The design concept of the present invention is provided to adjust the entire adjustment relationship, and only produces a small amount of pollution. The basic design principles of the present invention are proposed in the scope of the attached patent application

Page 6 i 434567 ^--

5. Description of the invention (3) Read. In the present invention, the EGR system is used in an engine with a conventional contact filter, which results in a substantially small amount of NOx. This cutting edge, can reach 50% 'and may make the existing diesel engine can be upgraded to the existing emission standards, and the modern diesel efficiency can be upgraded from New Zealand # 诚 袖] to meet the unillustrated Brief description The invention will be described below by way of non-limiting examples and drawings. ^ Figure 1 is a view of an EGR system according to the present invention ;: Figure 2a shows a partial view TSX of a valve ship according to the present invention in a terminal position, and Figure 2b is a view from Figure 2a according to arrow BB Partial view of the valve body, Fig. 3a shows a partial view of the valve body in the middle position according to the present invention; Fig. 3b shows a partial valve of the valve body in Fig. 3a viewed from an arrow BB; Fig. 4a shows a valve according to the present invention Sectional view of the body at the second terminal position; Figure 4b shows a partial view of the valve body in Figure 4a as viewed from the direction of arrow BB. -

V. Description of the invention (4) 1 Engine 2 Air filter 3 Intake passage 4 Turbo inflator 5 Intercooler 6 Exhaust line 7 Catalyst 9 Tail pipe 10 Recirculation duct 11 Cooler 12 Control valve device 13 EGR control Device 14 λ probe 15 -16 sensor 18 second entry channel 19 exit channel 20, 21 damper 22 adjustment motor 25 action pin 26 action arm detailed description of the preferred embodiment: η

Page 8 434 ^ 67m V. Description of the invention (5) Circle ^ shows the structure of the basic elements of the present invention, the "combustion 5 丨 engine" in the embodiment of the basic element 'The engine is a full-wheel inflatable diesel engine can also be diesel without supercharged 5 丨 Engine, < Two = Except for two poles, there are other different types of super-inflatable diesel engines. The air enters the air inlet through an air inlet and an air transition device 2 and directly enters an air intake passage into a turbo inflator 4 where the air is inflated and then further transmitted through a mutual cooler 5. The supercharged air in the intercooler is cooled down before being delivered to the engine. The exhaust gas from the engine 1 first passes through the second side (ie, the driving side) of the turbo inflator 4 and then passes through an exhaust line 6 ′ —the catalyst 7 and the particle collector 8, and finally is discharged to the tail pipe 9 to Outside air. The tail pipe 9 (that is, the extension pipe of the exhaust pipe after the catalyst and particle collector) has a manifold and a recirculation pipe 10 to recirculate a part of the exhaust gas into the engine. The recirculation line 10 appropriately cools the recirculated exhaust gas through a cooler 11 and the duct is connected to the intake passage 3 via a valve device 12 which is controlled by an EGR control device 13. With the assistance of the EGR control device 13, the valve device 12 can adjust the supply of fresh air from the intake passage 3 and the supply of super-aerated exhaust gas from the recirculation duct 10. The EGR control device 13 of the regulating valve device 12 is supplied with the actual operation of the engine from a probe 14 ′, a sensor for sensing the engine speed, and a sensor 16 for position throttling. State-related information, and this control device is programmed to control the valve device 12 and, therefore, the mixing correlation between the fresh air / exhaust gas is controlled in order to leave the end line 9,

Page 9 434? 67 * 5. Description of the invention (6)-and the quantity of harmful substances entering the outside air can be minimized. The programming of the EGR control device 13 is performed in a previously well-known manner and taking into account the correlation between the different factors given above. As known to those skilled in the art, the out signal provided by the probe changes with the oxygen content in the exhaust gas. The valve device 12 may include a separate valve in the intake passage 3 and the recirculation line 10. The valves are controlled by the EGR control devices 1 3 and 3 respectively. In addition, the 12 device 12 also includes a unit. In this unit, the fluids from the intake passage 3 and the recirculation line 10 can be combined as required. The valve in the device achieves this function. Then the fluid enters a common output fluid, and this flow is further transmitted to the turbo inflator for turbine gas. It is introduced into the engine via the intercooler 5. A particularly suitable valve-device 12 in a unit is a special part 'in the present invention and this part will be described later. The valve body shown in Figures 2 to 4 is a type of mixing valve. This mixing valve is provided to mix the flow in the flow in such a way that the fluid in the flow in one of the two inlet channels can be adjusted from 0. To the maximum, and thereafter the fluid t flowing in the second inlet passage is adjusted from the maximum to 1. When using the device according to the invention shown in FIGS. 2 to 4, like the valve device 12 in the method and device according to the invention, the intake passage 3 is connected to: the second inlet passage 18 of the valve, and The circulation line is connected to the first inlet passage of the valve. Further, in the valve body, there is an outlet passage 19, and in this embodiment, the gas vessel mixed in the valve body conveyed by the passage enters the turbo inflator 4. Dampers 20, 21 are provided in the two access channels 17 and 18, respectively. These dampers can be adjusted by the motor 22 and an action pin which can be moved by the motor.

Page 10 434S67 * V. Description of Invention α)

25 and the frame is moved between the opening and closing positions, and the action pins can be pivotally connected to the corresponding action arms 26, 27 on the corresponding axes 2 3, 24 »The action arms 26 are cut by the springs 28 and 29. 27 to a normal position, as shown in circle 3, where the dampers 20, 21 are held in a position such that the access channels 17, 18 are openers. In the position shown in FIGS. 2a and 2b (which is a starting position), the damper 20 is turned by the adjusting motor 22 through the action pin 25 and the action arm 26 to a closed position and connected to the recirculation pipe The first entry channel of the road 10 is closed 'so no exhaust gas can be recirculated to the turbocharger and engine · _. The spring 29 maintains the second actuating arm 29 in a normal position, which means that the damper 21 in the second inlet passage 18 connected to the intake passage 3 * is maintained in the normally open position 'and Inlet air is allowed to flow through the outlet passage 19 through the valve to the turbo inflator. The adjustment motor 22 is controlled by the EGR control device 13 to adjust the relationship between the fresh air passing through the intake passage 3 and the exhaust gas passing through the recirculation circuit. At the position where the damper 21 is opened, the adjusting motor 26 can rotate the damper 20 via the action bolt 25 and the action arm 26, so that the damper moves from a fully closed position as shown in FIGS. 2a and 2b to a 3a, 3b, here, the damper 20 is also in a position where the first free passage 17 can be opened. The adjustment motor can also adjust the damper 20 to enter any position between these two end positions. In the positions shown in Figs. 3a and 3b (the normal position of the adjustment motor 20), the adjustment of the adjustment motor 25 can be any one of the action arms 26, 27, but the springs 28, 20 can be maintained at a Normal position, so in this position 'two dampers 20, 21 can open the access channel 17, 18.

Page 11 耝 34¾6 7 鳙 V. Description of the invention (8) Figures 4a and 4b show the positions relative to one of the orders 2a and 2b. Therefore, the closed position of the damper 21 is turned by the adjustment motor 22 through the action pin 25 and the action arm 27, which means that the connection between the intake passage 3 and the outlet passage 19 is completely interrupted, and vice versa, the connection to the The loop pipe is completely open 'and allows the recirculated exhaust gas to flow through the road 19, then enter the turbo inflator 4 and further into the engine. However, by adjusting the motor 22, the damper can be adjusted to any intermediate position between the end positions shown in Figs. 3 and 4, and controlled by the Egr control device ^ 3 to obtain the required mixing with the recirculated exhaust gas. The amount of fresh air β Therefore, using the valve body of the present invention, it is possible to use a simple way to control a three-way valve with two inlets and a normal position, where both inlets are opened, so that one of the inlets or The other can be controlled in a non-stepping manner, while the other inlet is maintained in the open position. Of course, the valve can be controlled by means other than the above-mentioned EGR control device 13, and the above-mentioned different connection can also be used. Moreover, a connection different from the above-mentioned method can be applied, and the required control properties can still be obtained. In the recycling method of the present invention 'a slave probe 14, a motor is used

Information provided in the speed sensor 15 and the throttle position sensor 16. This control unit is connected to the valve unit, which corresponds to the valve unit described in the text, to regulate the air flow of the air or recirculated exhaust gas to the engine. A valve device is provided between the air filter and the engine's inlet passage 'and may also include separate valves in the inlet air passage and recirculation line as for the valve device J 2, or a three-way valve of the type described above Valve. The valve device can be controlled in the manner described above, and based on the received turn-in signal, the control device also

Page 12 4343 £ 7 * V. Description of the Invention (9) The relationship between the air / fuel of the engine can be controlled by adjusting the amount of flowing air while adjusting the relationship between the actual fresh air and the recirculated exhaust gas. This design concept of the present invention may be super-inflated or not. According to the adjusting method and device of the present invention, it is possible to further reduce the NOx content of the exhaust gas leaving the terminal pipeline of the diesel engine.

Page 13

Claims (1)

ft 88122244 Amendment 34567® VI. Patent application group I_______ 1. A method for recirculating a part of the exhaust gas from a diesel engine (η exhaust pipe (6, 9) to the inlet of one of the engines, The exhaust gas is diverted from the exhaust line (6'9) and enters a controllable valve device (12) between the engine and its air inlet (2) via a recirculation line (10), so It makes it possible to 'supply air / recycled exhaust gas to the combustion chamber in the engine' according to the required relationship. The valve device includes a damper (20'21) arranged in the inlet passage (17, 18) to recirculate the exhaust gas and correspondingly The air is characterized by the drive motor (22) shared by the damper, so that at least one of the dampers (20, 21) is always maintained in the open position, and the other damper is closed "2 The method of item 1 in the scope of patent application, wherein the exhaust gas from the exhaust pipe (6'9) is diverted after a catalyst (7) and a particle filter (8). Method 1 or 2 based on the engine provided 1) Information (14, 15, 16) related to the actual operating status, the control device (13) controls the valve device (12), and adjusts the relationship between the air / recycled exhaust gas. The method of item 1 or 2, wherein the exhaust gas in the recirculation line (10) is cooled in a cooler (Π), and the cooler is arranged in the recirculation line (10). The method of item 1 or 2, wherein the super-inflated diesel engine is used to supply exhaust gas at the air inlet (2) and the turbo inflator (4). 6.-An exhaust pipe of the engine (1) ( 6, 9) To the entrance of the engine Page 15 this 34 no 67 鲢 _ 索 号 88122244__ year month day amendment six, a part of the patent application group exhaust gas recirculation device, which provides a recirculation pipe (10) to exhaust gas from the exhaust pipe Turn in the road (6, 9), and point to the controllable valve device (12) arranged between the engine and an air inlet (2), so that it can 'supply air / recycled exhaust gas according to the required relationship To the combustion chamber in the engine (1), the valve device includes a damper (20'21) arranged in the inlet-channel (丨, 18) for recirculating exhaust gas and air, and is characterized by a valve device Make at least one of the dampers always in the open position, and configure the drive motor (22) common to the dampers to approach the other one of the dampers (20'21). 7. The device according to item 6 of the scope of patent application, wherein based on the provided information (14, 15, 16) related to the actual operating state of the engine, and by the position of the damper (20, 21), the control device (13 ) The relationship between the air / recirculated exhaust gas in the control valve device (12), and the drive (12) of the control valve device (12). 8. As in any one of the items 6 or 7 of the scope of patent application, 4 ^ After the agent (7) and the particle transition device (8), the recirculation pipeline (the exhaust pipeline (6, 9) of the engine is continuously reported. 9) The recirculation pipeline as in item 6 or 7 of the scope of patent application (10) is equipped with a cooler: 丄: ㈠ 其 ㈠ 1Λ, which recirculates the exhaust gas in the cold part. In the device having any one of the items 6 or 7 of the 2nd Lee Fan Park, in which the diesel engine of the gas engine In the middle, the valve (12) is arranged between the air inlet port and the turbo inflator. The two such as Λ please special :! Any device in the 6th or 7th range of the item, wherein the medium motor is a stepper motor ( 22), configure this motor to t Case No. 88122ΪΜΑ Λ _____ Ά 43 ^ 7_ Amendment VI. One of the patent application group Nica, 21) damping the nipple at any position. 1 The device as in any of the items 6 or 7 of the scope of patent application, wherein ^: the two dampers (20, 2 " in the position are loaded by an spring (28, 29) to an open position, β aa * / 3, a type of fluid for mixing fluids flowing through the two inlet channels (17, 18) is characterized in that a damper is arranged in both inlet channels (1 ?, 18), and at least one damper is an opener, A common motor (22) is arranged to close another damper in the damper (20, 21). 14. As in the valve body 纟 of the scope of application for patent, the motor is a 'motor (22) , Configure the motor to operate the damper in one of the periods, 21), and adjust the damper at any position. 15. The valve body according to item 13 or 14 of the scope of the patent application, wherein the two dampers (20, 21) in the normal position are loaded by an spring (28, 29) to an open position. In a method for regulating a diesel engine, a part of exhaust gas from a diesel engine is recirculated to an inlet thereof, and a valve device (12) controlled by a control device (13) adjusts a relationship between supplied fresh air and recirculated exhaust gas, and Regulates the supply of fresh air and recirculated exhaust gas entering the diesel engine, which is characterized by the information feed control device (13) from the probe U4), the engine speed sensor (19) and the throttle position sensor (16) ), So the air / fuel relationship of the diesel engine is adjusted by this information and valve device β 1 7. The adjustment method of item 16 in the scope of patent application, which uses the valve body in any of the scope of patent application 13 or 14 As a valve device. IBM ΙΙΗ Page 17-1 ^ ___ 88122244 Amendment VI. Application Patent® 18 · A regulating device for a diesel engine, including a mechanism (10) 'one of the exhaust gas from the diesel engine to its inlet Partial recirculation 'and a valve device (12), through the control device (13), this valve device (12) controls the supply of fresh air and recirculated exhaust gas entering the diesel engine, so the supplied fresh air and recirculation can be adjusted The relationship between exhaust gas, one of which is an engine speed sensor (15) connected to the control device (13) with a throttle position recirculator (16) to provide information to the control device, and the control device is configured (13) The air / fuel relationship through the information oil engine.调 知 柴 19. If the adjusting device of the scope of application for the patent No. 18, the application of any of the scope of the patent application for 13 or 14 can be used as a valve device.