JP2021134762A - Exhaust emission control device - Google Patents

Abstract

To devise the arrangement of a plurality of controllers to improve assemblability.SOLUTION: An exhaust emission control device 1 for purifying the exhaust of an engine mounted on a vehicle, comprises: a first casing 2C in which a first purification member for exhaust emission control is stored; a second casing 3C that is for exhaust emission control, and in which a second purification member different from the first purification member is stored; a plurality of sensors 5 that is arranged at least in each of the first casing 2C and the second casing 3C, and detects the state of the exhaust circulating in the casings 2C, 3C; a plurality of controllers 6 that controls the plurality of sensors 5; and a bracket 10 that is attached to a frame 9 of the vehicle, and holds the plurality of controllers 6 in one place.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to an exhaust gas purification device mounted on a vehicle.

Vehicles equipped with an engine are provided with an exhaust gas purification device for purifying the exhaust gas. The exhaust gas purification device includes a DPF device equipped with a filter (DPF) that collects particulate matter (PM) contained in the exhaust gas, and a selective reduction catalyst that reduces and purifies nitrogen oxides (NOx) contained in the exhaust gas. A device including an SCR device provided with (SCR) is known. For example, Patent Document 1 discloses an installation structure of an exhaust gas purification device including an upstream casing in which a pre-stage oxidation catalyst and DPF are stored and a downstream casing in which an SCR catalyst and a post-stage oxidation catalyst are stored. In this structure, the exhaust purification device is connected to the side frame of the vehicle via a bracket.

JP-A-2009-78591

By the way, in the casing as in Patent Document 1 described above, sensors for detecting the state (for example, temperature and component) of the exhaust gas flowing inside are attached to a plurality of places. Each of these sensors is equipped with a controller, but each controller is generally located in the vicinity of the corresponding sensor. However, it is difficult to improve the assembleability by arranging the controller at each of the sensor arrangement locations.

The exhaust gas purification device of the present disclosure was devised in view of such a problem, and one of the purposes is to improve the assembleability by devising the arrangement of a plurality of controllers.

The exhaust gas purification device disclosed here is an exhaust gas purification device for purifying the exhaust gas of an engine mounted on a vehicle, and is a first casing in which a first purification member for exhaust gas purification is housed and an exhaust gas purification device. , A second casing in which a second purification member different from the first purification member is stored, and at least the first casing and the second casing are each arranged to detect the state of exhaust gas flowing in the casing. It is characterized in that it is provided with a plurality of sensors, a plurality of controllers for controlling the plurality of sensors, and a bracket which is attached to the frame of the vehicle and holds the plurality of controllers in one place.

As described above, in the exhaust gas purification device, a plurality of sensors arranged in at least each of the first casing and the second casing to detect the exhaust gas state, a plurality of controllers for controlling the plurality of sensors, and a plurality of controllers are provided. A bracket that can be put together in one place is provided. Therefore, since the controllers provided for each sensor are integrated into one bracket, the assembleability is improved as compared with the case where each controller is arranged at the same position as the sensor.

According to the exhaust gas purification device of the present disclosure, it is possible to improve the assembling property by devising the arrangement of a plurality of controllers.

It is a schematic perspective view for demonstrating the exhaust gas purification apparatus as an embodiment. It is a perspective view which shows the bracket and the controller provided in the exhaust gas purification apparatus of FIG.

An exhaust gas purification device as an embodiment will be described with reference to the drawings. The embodiments shown below are merely examples, and there is no intention of excluding the application of various modifications and techniques not specified in the following embodiments. Each configuration of the present embodiment can be variously modified and implemented without departing from the gist thereof. In addition, it can be selected as needed, or can be combined as appropriate.

[1. composition]
The exhaust gas purification device 1 of the present embodiment is a device that purifies the exhaust gas discharged from an engine (for example, a diesel engine, not shown) mounted on a vehicle. In this embodiment, as shown in FIG. 1, an exhaust gas purification device 1 including a DPF device 2 and an SCR device 3 is illustrated. Further, in the present embodiment, the configuration in which the exhaust gas purification device 1 is attached to the side frame 9 on the right side of the vehicle (partially shown by the alternate long and short dash line in FIG. 1) is illustrated. The side frame 9 is a pair of left and right skeleton members extending in the front-rear direction of the vehicle, and is formed, for example, in a U-shaped cross section.

The white arrows in FIG. 1 indicate the flow of exhaust gas flowing into the DPF device 2. The DPF device 2 is a purification device arranged on the upstream side of the exhaust gas purification device 1, and is a front-stage oxidation catalyst and a particulate filter (Diesel Particulate Filter, hereinafter “DPF”) (not shown) in a tubular first casing 2C. ) Is housed and constructed. The pre-stage oxidation catalyst is an oxidation catalyst that oxidizes nitric oxide (NO) in exhaust gas, hydrocarbons (HC) in unburned fuel, and the like, and is configured by supporting a catalytic substance on a honeycomb-shaped carrier. The DPF is a porous filter that collects particulate matter (Particulate Matter, hereinafter referred to as “PM”) contained in the exhaust gas, and is arranged downstream of the pre-stage oxidation catalyst. The pre-stage oxidation catalyst and DPF are purification members (first purification member) for exhaust gas purification. A pipe (not shown) connecting the engine and the DPF device 2 is connected to the upstream side of the first casing 2C. At least one of the pipe and the upstream end of the first casing 2C is fixed to the side frame 9 via a bracket or the like (not shown).

The SCR device 3 is a purification device arranged on the downstream side of the exhaust gas purification device 1, and contains a selective reduction catalyst (Selective Catalytic Reduction, hereinafter referred to as “SCR”) (hereinafter referred to as “SCR”) in a tubular second casing 3C. The latter stage oxidation catalyst is housed and configured. SCR is a catalyst that reduces and removes nitrogen oxides (NOx) in exhaust gas, and is configured by supporting the catalyst on a honeycomb-shaped carrier. The latter-stage oxidation catalyst is arranged downstream of the SCR and is an oxidation catalyst for removing excess ammonia in the reduction reaction in the SCR, and is configured in the same manner as the first-stage oxidation catalyst, for example. The SCR and the post-stage oxidation catalyst are also purification members for exhaust gas purification (second purification member). A pipe (not shown) for discharging the exhaust gas to the outside of the vehicle is connected to the downstream side of the second casing 3C.

The exhaust gas purification device 1 of the present embodiment is a vehicle in a direction in which the longitudinal direction of the second casing 3C in which the second purification member is stored is substantially orthogonal to the longitudinal direction of the first casing 2C in which the first purification member is stored. It is installed in. The first casing 2C is provided with an inlet on which exhaust gas flows in on one end side (front side of the vehicle) in the longitudinal direction, and an outlet on the other end side (rear side of the vehicle) in the longitudinal direction. Further, the second casing 3C is provided with an inlet for exhaust gas to flow in on one end side (right side of the vehicle) in the longitudinal direction, and an exhaust outlet on the other end side (left side of the vehicle) in the longitudinal direction.

The exhaust gas purification device 1 includes an intermediate pipe 4 that communicates the two casings 2C and 3C. The upstream end of the intermediate pipe 4 is fixed to the outlet of the first casing 2C, and the downstream end of the intermediate pipe 4 is fixed to the inlet of the second casing 3C. The extension direction of the intermediate pipe 4 is the vehicle width direction. The intermediate pipe 4 is provided with a reducing agent injection device (not shown) on the downstream side in the exhaust flow direction of the sensor 5 (NOx sensor) provided in the intermediate pipe 4.

The exhaust gas purification device 1 of the present embodiment has a mounting member 20 for attaching the two casings 2C and 3C to the vehicle body (side frame 9 in the present embodiment) in a state where the first casing 2C and the second casing 3C are connected. The mounting member 20 includes a DPF band 21 that sandwiches the outer peripheral surface of the first casing 2C, two SCR bands 22 that sandwich the outer peripheral surface of the second casing 3C, and two side surfaces that sandwich the second casing 3C from the front-rear direction of the vehicle. It has a portion 23 and a connecting surface portion 24 that connects the DPF band 21 and the side surface portion 23.

The DPF band 21 sandwiches the vehicle rear side of the first casing 2C and is fastened to the connecting surface portion 24. Each SCR band 22 sandwiches the second casing 3C at a position separated in the longitudinal direction and is fastened to the side surface portion 23, and the side surface portion 23 is fastened to the connecting surface portion 24. As described above, in the exhaust gas purification device 1 of the present embodiment, the DPF device 2 and the SCR device 3 are mounted on the vehicle in a compact state.

The exhaust gas purification device 1 is arranged in at least each of the first casing 2C and the second casing 3C, and has a plurality of sensors 5 for detecting the state of exhaust gas circulating inside and a plurality of controllers for controlling each of the plurality of sensors 5. Has 6 and. Examples of the sensor 5 include a pressure sensor, a temperature sensor, a NOx sensor, a PM sensor, and an NH ₃ sensor. In addition to the casings 2C and 3C, the various sensors 5 may be arranged in the pipes on the upstream side of the first casing 2C, the intermediate pipes 4, and the pipes on the downstream side of the second casing 3C.

The controller 6 is provided for each sensor 5 and is connected to the corresponding sensor 5 via the harness 7. Examples of the controller 6 include a pressure sensor controller, a temperature sensor controller, a NOx sensor controller, a PM sensor controller, and an NH ₃ sensor controller. The controller 6 converts the physical quantity detected by the corresponding sensor 5 into an electric signal and sends it to an ECU (not shown). The harness 7 is arranged around the first casing 2C and the second casing 3C, and misalignment is prevented by a clip or the like (not shown).

Further, the exhaust gas purification device 1 has a bracket 10 for gathering a plurality of controllers 6 in one place. The bracket 10 is attached to the side frame 9 of the vehicle (for example, the side surface facing inward in the vehicle width direction), and is arranged with a gap above the first casing 2C. Each controller 6 is arranged on the upper surface side of the bracket 10. In other words, the bracket 10 is located between the controller 6 and the first casing 2C, whereby the bracket 10 functions as a heat insulating material.

FIG. 2 is a perspective view showing the bracket 10 and the controller 6 attached to the bracket 10. The bracket 10 of the present embodiment is configured by combining one lower member 11 extending in the vehicle width direction and two upper members 12 and 13 arranged on the upper surface of the lower member 11. The lower member 11 and the upper members 12 and 13 are all formed by bending a plate material. The lower member 11 is provided with a frame mounting portion 11a for mounting the bracket 10 to the side frame 9 and a mounting portion 11b on which the upper members 12 and 13 are mounted.

The upper member 12 located on the side frame 9 side has a U-shape that opens upward when viewed from the rear of the vehicle, and the lower surface portion 12b between the vertical wall portions 12a and 12a facing each other is mounted on the mounting portion 11b. NS. Similarly, the upper member 13 arranged adjacent to the upper member 12 also has a U-shape that opens upward when viewed from the rear of the vehicle, and the lower surface portion 13b between the vertical wall portions 13a and 13a facing each other is placed on the mounting portion 11b. It will be placed. The two adjacent vertical wall portions 12a and 13a are arranged in surface contact with each other. The plurality of controllers 6 are fixed to the vertical wall portions 12a and 13a and the lower surface portions 12b and 13b of the upper members 12 and 13, and are integrated in the bracket 10. For example, a plurality of controllers 6 corresponding to a plurality of sensors 5 arranged in the first casing 2C are integrated on one of the two upper members 12 and 13, and a second casing is placed on the other of the two upper members 12 and 13. A plurality of controllers 6 corresponding to a plurality of sensors 5 arranged in 3C may be aggregated. The vertical wall portions 12a and 13a may be provided with protrusions to further increase the number of attachment points of the controller 6.

[2. Action, effect]
The exhaust gas purification device 1 described above includes a plurality of sensors 5 arranged in at least the first casing 2C and the second casing 3C, a plurality of controllers 6 for controlling the plurality of sensors 5, and a plurality of controllers 6. A bracket 10 for gathering in one place is provided. As described above, according to the exhaust gas purification device 1 described above, since the controllers 6 provided for each sensor 5 are integrated into one bracket 10, compared with the case where each controller 6 is arranged at the same position as the sensor 5. It is possible to improve the assembling property.

Further, since the bracket 10 described above is configured by combining the lower member 11 and the upper members 12 and 13, it is possible to increase the number of mounting points of the controller 6 while simplifying the configuration. Further, since the mounting portion 11b of the lower member 11 and the lower surface portions 12b and 13b of the upper members 12 and 13 are overlapped with each other, the bracket 10 is heat-insulated as compared with the case where the bracket 10 is composed of a single plate material. The performance can be improved, and the heat of the first casing 2C can be further suppressed from being transferred to the controller 6.

[3. Modification example]
The configuration of the exhaust gas purification device 1 described above is an example. For example, the bracket 10 is not composed of the lower member 11 and the upper members 12 and 13, but may be composed of one member. Further, the bracket 10 may be attached to the side surface of the side frame 9 facing outward in the vehicle width direction, or may be located above the second casing 3C.

The arrangement of the DPF device 2 and the SCR device 3 described above is not limited to the above. For example, these devices 2 and 3 may be arranged in the opposite direction, may be arranged in parallel, or may be arranged so as to extend in the front-rear direction of the vehicle (approximately linearly). Further, the method of fixing the DPF device 2 and the SCR device 3 to the vehicle body does not have to be the method using the above-mentioned mounting member 20. Further, instead of or in addition to the DPF device 2 and the SCR device 3, an exhaust gas purification device accommodating other purification members may be provided. For example, an exhaust gas purification device may be provided that accommodates an SCRF (Selective Catalytic Reduction on filter) in which a filter is coated with a selective reduction catalyst. When an exhaust purification device accommodating the SCRF is provided instead of the DPF device 2, a reducing agent injection device may be provided in the casing accommodating the SCRF.

1 Exhaust purification device 2 DPF device 2C 1st casing 3 SCR device 3C 2nd casing 5 Sensor 6 Controller 7 Harness 9 Side frame (frame)
10 bracket

Claims (1)

In an exhaust purification device for purifying the exhaust of an engine mounted on a vehicle
The first casing in which the first purification member for exhaust gas purification is stored, and
A second casing for exhaust gas purification, in which a second purification member different from the first purification member is stored,
A plurality of sensors arranged in at least each of the first casing and the second casing and detecting the state of the exhaust gas flowing in the casing, and
A plurality of controllers that control each of the plurality of sensors, and
An exhaust gas purification device, which is attached to the frame of the vehicle and includes a bracket for gathering the plurality of controllers in one place.

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