JPH0458054A - Exhaust recirculation device for diesel engine - Google Patents

Abstract

PURPOSE:To stabilize the volume of EGR gas and to enhance the facility of control of the volume by controlling the opening and closing of a third valve in accordance with input signals indicating a load and rotational speed of an engine, and by using the intake and exhaust systems for engine cylinders as pipe line systems. CONSTITUTION:At first, a third valve 13a is opened so as to recirculate exhaust gas from an EGR port 12 to an intake manifold 4 through a pipe line 18 before an exhaust valve is opened during expansion stroke of #1 engine cylinder. At this time, EGR gas is sucked into #3 engine cylinder which is on suction stroke so that its intake vacuum becomes maximum. That is, when the third valve 13a is opened, the gas pressure is higher than that obtained when the exhaust valve is opened, and accordingly, the EGR recirculation can be carried out from #1 engine cylinder to #3 engine cylinder by a blow-out discharging energy. Subsequently, similar exhaust gas recirculation is carried out successively, from #4 engine cylinder to #5 engine cylinder, from #2 engine cylinder to #1 engine cylinder, from #6 engine cylinder to #4 engine cylinder, #3 engine cylinder to #2 engine cylinder and #5 engine cylinder to #6 engine cylinder.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is an exhaust gas recirculation (hereinafter referred to as EGR) device as a means of improving NOx in exhaust gas. This invention relates to a device that facilitates the control of recycling and recirculation amounts.

[Conventional technology]

In the conventional EGR device, an EGR pipe is simply installed from the exhaust pipe to the intake pipe side, and the exhaust gas circulation amount is controlled using exhaust pressure or intake negative pressure.

As a result, the amount of exhaust gas suction becomes unstable,
This was insufficient to reliably control the amount of circulation.

[Problems to be Solved by the Invention] Therefore, the present invention is capable of stably controlling EGR gas and reliably controlling the amount of EGR gas by actively sucking EGR gas into each cylinder of a diesel engine according to each cycle. This is what I am trying to do.

[Means to solve the problem]

That is, the present invention provides a diesel engine in which the piping system is divided into two systems on the intake side and exhaust side of a plurality of cylinders, in which an EGR gas extraction tube 3 is installed on the exhaust side of each cylinder.
, and put these valves together for each of the two systems mentioned above, that's it! Exhaust gas rerefrigeration of a TASEL ELESIN, characterized in that the third valve is connected to the intake side of the system of t, and each of the third valves is operatively linked to an electronic control means that responds to the rotation and load of the engine. [Operation] In the device having the above configuration, each cylinder of the engine is opened by opening the third valve via electronic control means that uses the load and rotation of the engine as input signals. EGR residue is recirculated according to the order of combustion. [Embodiment] Next, the configuration of the apparatus of the present invention will be explained in detail with reference to FIGS. 1 and 2.

First of all, FIG. 1 is a schematic plan view of the main parts of an in-line six-cylinder diesel engine, in which each cylinder N of the engine l is
o, 1=No, and 6 have intake boats 28 to 2f, respectively.
, exhaust boats 3a to 3f are provided (1-), intake boats 2a to 2C, 2d to 2f are connected to an intake manifold 4.5 of a separate system, and the intake is branched into two parts midway from the air cleaner 6. There is a connection between tubes 7 and 8.

Also regarding the exhaust boats 38 to 3f, the exhaust boats 1 to 38
3c, 3d, and 3f are 1, so they are combined with the exhaust manifold 9.10 of the h separate system, and the exhaust pipe 1]
join at.

This invention provides an EGR pot 12a formed along the exhaust boats 3a to 3f of each of the series IJs o, 1-No., and 6.
= 12f to 2nd. A valve 13a=13f is provided.

The opening/closing control is to be controlled by electronic control means, which will be described later, which emits signals based on the load and rotation of the engine. In the No. 1 cylinder head 14, an intake boat 2a with an intake valve 15, an exhaust boat 3a with an exhaust valve 16, etc. are formed, and an E C is provided near the exhaust boat 3a.

An R boat 12a is installed, and a third valve 13a operated by an electronic control means 17 opens and closes the EGR boat 12a, and the EGR boat 12a is connected to the EGR boat 12a through a pipe 18. In order to communicate with the intake air port 2a, such a configuration is applied to each cylinder NO.
The pipes 18 for cylinders 04 to 6 are joined together as shown in FIG. Before opening the exhaust valve 16 during the expansion stroke of step 1,
The third valve 13a is opened to allow recirculation from the EGR boat +2a to the intake manifold 4 for cylinders 5r'No., 1 to 0.3 via the pipe]8. At this time, the EGR gas is in the intake stroke and is sucked into the cylinder N sail 3 which serves as an intake negative pressure dog. That is, the third valve 1
Since the gas pressure when 3a is opened is higher than when the exhaust valve 16 is opened, the gas pressure is higher than that when the exhaust valve 16 is opened.
7~(・1 or I)n'I>”f~(+, ',
4/% [IcoR circulation, t. Similarly under JrJi, Soricida No. 4'-S11n7'Nn,
5; Cylinder 5rNo, 2~Cylinder\0.1; Cylinder 1j Fern Nn, 6~Cylinder N04:)+1 nta~(13~Cylinder T1g' No, 2 Niji', 1>, 7No
, 5 to ring No. 6, the exhaust gas is sequentially recirculated.
A third valve is provided as a device, and the third valve is electronically controlled to open and close using the engine load and rotation as input signals, and the piping system is configured to include cylinders No. 1 to 3 and cylinders to o4. 6 to 6 are each integrated into an integrated intake and exhaust system, which greatly contributes to the stabilization of the amount of EGR residue and the ease of controlling the amount.

[Brief explanation of drawings]

FIG. 1 is a layout diagram of the main parts of this device, and FIG. 2 is an enlarged sectional view of a portion thereof. Figure 13 shows F1'. 13a-1? lf The third valve electronic control means for the intake manifold.

Claims (1)

[Claims] (1) In a diesel engine in which the piping system is combined into two systems on the intake side and exhaust side of multiple cylinders, a third valve for EGR gas extraction is provided on the exhaust side of each cylinder, and these valves are connected to the two piping systems. A diesel engine characterized in that each system is connected to the intake side of each system, and each of the third valves is operatively linked to an electronic control means that responds to engine rotation and load. Exhaust gas recirculation device.