Exhaust device of engine

Patent metadata

Field	Value
Publication number	US-10550750-B2
Application number	US-201815905502-A
Country	US
Kind code	B2
Filing date	Feb 26, 2018
Priority date	Mar 10, 2017
Publication date	Feb 4, 2020
Grant date	Feb 4, 2020

Abstract

A downstream-side exhaust-gas takeout portion of a pressure-difference detector is provided between an exhaust-gas discharge port of a downstream-side cover and an EGR-gas takeout port so that a stable exhaust-gas pressure can be taken out (detected).

First claim

What is claimed is:

1. An exhaust device of an engine, comprising:
a particulate filter provided on an exhaust path of the engine and comprising a filter body to trap a particulate contained in exhaust gas which is discharged from the engine and a filter case housing the filter body; and
a pressure-difference detector to detect a pressure difference between the exhaust gas positioned on an upstream side, in an exhaust-gas flow direction, of the filter body and the exhaust gas positioned on a downstream side, in the exhaust-gas flow direction, of the filter body,
wherein said pressure-difference detector comprises an upstream-side exhaust-gas takeout portion which takes out a portion of the exhaust gas positioned on the upstream side, in the exhaust-gas flow direction, of the filter body, a downstream-side exhaust-gas takeout portion which takes out a portion of the exhaust gas positioned on the downstream side, in the exhaust-gas flow direction, of the filter body, and a pressure-difference sensor to detect the pressure difference of the portion of the exhaust gas taken out by said upstream-side exhaust-gas takeout portion and the portion of the exhaust gas taken out by said downstream-side exhaust-gas takeout portion,
an exhaust-gas discharge port and an EGR-gas takeout port are provided at a downstream-side end portion of said filter case,
a center axis of the exhaust-gas discharge port is provided at a position which is offset from a center axis of said filter body,
the EGR-gas takeout port is provided at a position which is offset from the center axis of the filter body on a side of the center axis of the filter body that is opposite the position of the center axis of the exhaust-gas discharge port to thereby suppress influence of a dynamic pressure of the exhaust gas flow directed to the exhaust-gas discharge port and the EGR-gas takeout port, and
the downstream-side exhaust-gas takeout portion of said pressure-difference detector is provided between said exhaust-gas discharge port and said EGR-gas takeout port at said downstream-side end portion of the filter case.

2. The exhaust device of the engine of claim 1 , further comprising an L-shaped exhaust pipe connected to an upstream side, in the exhaust-gas flow direction, of said filter case and configured to be bent in a L shape,
wherein a step portion which is recessed outward is provided at a portion of an outer-periphery side wall of L-shaped bending of said L-shaped exhaust pipe which is spaced apart, on a side of said filter body, from a L-shaped bending portion of the L-shaped exhaust pipe, and
the upstream-side exhaust-gas takeout portion of said pressure-difference detector is provided at said step portion of the L-shaped exhaust pipe.

3. The exhaust device of the engine of claim 2 , wherein a catalyst to purify the exhaust gas is connected to an upstream-side portion of said L-shaped exhaust pipe, and a downstream-side portion of said catalyst is configured to overlap a portion of an upstream-side end face of said filter body, when viewed in an axial direction of said particulate filter.

4. The exhaust device of the engine of claim 1 , wherein said particulate filter is disposed laterally such that the exhaust gas passes through the particulate filter in a lateral direction, an L-shaped exhaust pipe which is connected to an upstream side, in the exhaust-gas flow direction, of said filter case and configured to be bent in a L shape is provided, the upstream-side exhaust-gas takeout portion and the downstream-side exhaust-gas takeout portion of said pressure-difference detector are respectively provided at a lower portion of said L-shaped exhaust pipe and a lower portion of said downstream-side end portion of the filter case, and the pressure-difference sensor of the pressure-difference detector is provided around an upper side of the particulate filter.

5. The exhaust device of the engine of claim 2 , further comprising:
an EGR-gas takeout pipe connected to said EGR-gas takeout port and provided to pass beside said particulate filter which corresponds to an outer-periphery side of the L-shaped bending of said L-shaped exhaust pipe;
an EGR-pipe support member provided beside the particulate filter and supporting said EGR-gas takeout pipe;
an upstream-side exhaust-gas takeout pipe connecting said upstream-side exhaust-gas takeout portion and said pressure-difference sensor; and
a takeout-pipe support member fixed to said EGR-gas takeout pipe and supporting said upstream-side exhaust-gas takeout pipe.

Assignees

• Mazda Motor

Inventors

• Kuramashi Taku
• Kitabatake Keishi
• Takamure Tamotsu
• Kamo Toshiaki

Classifications

• F01N13/08

  Other arrangements or adaptations of exhaust conduits {(pipes, joints or supports therefor in general F16L; collecting or removing exhaust gases of vehicle engines in workshops B08B15/00, on highways E01C1/005)} · CPC title

• F02M26/15

  in relation to engine exhaust purifying apparatus · CPC title

• F01N13/009

  having two or more separate purifying devices arranged in series · CPC title

• F01N2470/18

  the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus · CPC title

• F01N3/021 Primary

  by means of filters · CPC title