WO2020136676A1 - Exhaust system of vehicle - Google Patents

Exhaust system of vehicle Download PDF

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Publication number
WO2020136676A1
WO2020136676A1 PCT/IN2019/050948 IN2019050948W WO2020136676A1 WO 2020136676 A1 WO2020136676 A1 WO 2020136676A1 IN 2019050948 W IN2019050948 W IN 2019050948W WO 2020136676 A1 WO2020136676 A1 WO 2020136676A1
Authority
WO
WIPO (PCT)
Prior art keywords
channel portion
catalytic converter
edge
converter channel
catalytic
Prior art date
Application number
PCT/IN2019/050948
Other languages
French (fr)
Inventor
Karan RAJPUT
Osamu Takii
Original Assignee
Hero MotoCorp Limited
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hero MotoCorp Limited filed Critical Hero MotoCorp Limited
Publication of WO2020136676A1 publication Critical patent/WO2020136676A1/en
Priority to CONC2021/0008255A priority Critical patent/CO2021008255A2/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/009—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 having two or more separate purifying devices arranged in series
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2470/00—Structure or shape of gas passages, pipes or tubes
    • F01N2470/18—Structure or shape of gas passages, pipes or tubes the axis of inlet or outlet tubes being other than the longitudinal axis of apparatus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Definitions

  • the present invention relates to vehicles and, more particularly, to an exhaust system of a vehicle.
  • An exhaust system of an internal combustion engine of a saddle type vehicle where an exhaust gas purification device such as catalyst device is mounted on the downstream side of the exhaust port of the internal combustion engine to reduce the amount of pollutants from exhaust gases.
  • the catalyst device is disposed in the exhaust path at a distance from the exhaust port of the internal combustion engine, as the exhaust pipe portion between the exhaust port of the engine and the catalyst device is directly exposed to the outside atmosphere there is a loss of heat from the exhaust gases.
  • the temperature of the exhaust gases received at catalyst device may not be enough for efficient performance of the catalytic conversion.
  • the exhaust pipe extends horizontally from the exhaust port of the engine and then is bent to form a vertical section, the catalyst device is disposed in the vertical section of the exhaust pipe. Many times, the vertical section available is not sufficient to dispose the catalyst device. Catalyst device being a straight cylindrical shape, it has always been a challenge to dispose it in a curved portion of the exhaust pipe.
  • a two wheeled vehicle comprising a frame; an internal combustion engine carried by the frame; and an exhaust system connected to the internal combustion engine.
  • the exhaust system comprises a first exhaust pipe portion connected to an exhaust port of the internal combustion engine , a first catalytic converter channel portion connected to the first exhaust pipe portion , an intermediate channel portion connected to the first catalytic converter channel portion , a second catalytic converter channel portion connected to the intermediate channel portion , and a second exhaust pipe connected to the second catalytic converter channel portion .
  • the first catalytic converter channel portion includes catalytic substrate in a first density
  • the second catalytic converter channel portion includes catalytic substrate in a second density.
  • the first catalytic converter channel portion is at an angle with respect to the second catalytic converter channel portion.
  • the first density of catalytic substrate is different from the second density of catalytic substrate.
  • the first density of catalytic substrate is greater than the second density of catalytic substrate.
  • the first density of catalytic substrate is same as the second density of catalytic substrate.
  • Aforementioned configuration helps to reduce emission from the internal combustion engine. More specifically, as the exhaust gases pass through the first catalytic converter channel portion, during such passage, the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion and absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs.
  • the body portion of the first catalytic converter channel portion of the exhaust system is positioned proximate to the exhaust port of the internal combustion engine, the temperature at which exhaust gases enter the body portion is higher, allowing for a more efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
  • the first catalytic converter channel portion is connected to the intermediate channel portion, the exhaust gases subsequently pass through the intermediate channel portion. Owing to the angular or bent profile of the intermediate channel portion, the exhaust gases passing through the intermediate channel portion are made to change directions, and tend to get a turbulent air flow. Resultantly, a proper mixing of the exhaust gases takes places takes place in the intermediate channel portion.
  • the second catalytic converter channel portion is connected to the intermediate channel portion receive the exhaust gases.
  • the exhaust gases pass through the second catalytic converter channel portion, and come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion.
  • the intermediate channel portion comprises, a first edge connected to the second end portion of the first catalytic converter channel portion , a second edge connected to the first end portion of the second catalytic converter channel portion , a third edge , and a fourth edge , wherein the third edge and the fourth edge are connected with the first edge and the second edge .
  • the first edge is positioned non-parallel with respect to the second edge.
  • the first edge, the second edge, the third edge and the fourth edge form a trapezoidal profile when viewed from a side of the two wheeled vehicle.
  • the intermediate channel portion connects the first catalytic converter channel portion with the second catalytic converter channel portion at an angle between 90 degree and 120 degree.
  • a first end portion of the first catalytic converter channel portion is connected to the first exhaust pipe portion, and a second end portion of the second catalytic converter channel portion is connected to the second exhaust pipe.
  • the intermediate channel portion connects the first catalytic converter channel portion with the second catalytic converter channel portion at an angle between 90 degree and 120 degree.
  • the first catalytic converter channel portion has a first predetermined length along an axis LI
  • the second catalytic converter channel portion has a second predetermined length along an axis L2.
  • the first predetermined length is greater than the second predetermined length.
  • the axis LI is positioned at an angle between 90 degree and 120 degree from the axis L2.
  • the present invention allows for having different lengths of catalytic substrate portion, the present invention allows for saving of cost associated with the catalytic substrate. This also tends to result in substantial reduction of cost of the exhaust system.
  • Figure 1 illustrates a side view of an exemplary two wheeled vehicle, according to an embodiment of the present invention
  • Figure 2 illustrates a view of a portion of the exemplary two wheeled vehicle, according to an embodiment of the present invention
  • Figure 3 illustrates a view of an exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention
  • Figure 4 illustrates view of a portion of the exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention
  • Figure 5 illustrates view of a portion of the exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention.
  • a vehicle (100) according to an embodiment of the present invention is illustrated.
  • the vehicle (100) referred to herein, embodies a two wheeled motorcycle.
  • the vehicle (100) may embody any other ridden vehicles such as scooters, three-wheeled vehicles, All-Terrain Vehicles (ATV) etc. without limiting the scope of the invention.
  • scooters three-wheeled vehicles
  • ATV All-Terrain Vehicles
  • the vehicle (100) comprises one or more body parts, such as a frame (12), a handle bar (14), a front wheel (16), a seat (18), a rear wheel (20), an engine (22), a headlight (24), and a fuel tank (26).
  • the frame (12) supports the engine (22) in middle portion of the vehicle (100).
  • the engine (22) provides necessary power required to drive the rear wheel (20) of the vehicle (100).
  • the engine (22) may provide necessary power to the drive the front wheel (16), or both the front wheel (16) and the rear wheel (20) simultaneously, without limiting the scope of the invention.
  • the rear wheel (20) is linked to the engine
  • the frame (12) supports the seat (18) which extends from middle portion towards rear portion of the vehicle (100).
  • the seat (18) provides seating for a rider and / or a passenger of the vehicle (100).
  • the fuel tank (26) provides necessary fuel to the engine (22) to generate power within the vehicle (100).
  • the frame ( 12) of the vehicle ( 100) also supports an exhaust system (200) of the internal combustion engine (22).
  • the fuel is supplied to the internal combustion engine (22) from the fuel tank (26) through a fuel inlet system (not illustrated).
  • the combustion of fuel takes place in a combustion chamber (not illustrated) of the internal combustion engine (22).
  • the exhaust gases are expelled from the combustion chamber through an exhaust port (not illustrated).
  • the exhaust system (200) of the internal combustion engine (22) is connected to the exhaust port of the combustion chamber.
  • the exhaust system (200) includes a first exhaust pipe portion (202) connected to the exhaust port of the internal combustion engine (22).
  • the exhaust gases, expelled by the internal combustion engine (22) are collected by the first exhaust pipe portion (202) through the exhaust port, therefore temperature at which the exhaust gases are received is high.
  • the first exhaust pipe portion (202) also referred to as a front exhaust pipe portion, has a first end portion (not numbered) connected to the exhaust port, and a second end portion (not numbered) connected to a first catalytic converter channel portion (204).
  • the first catalytic converter channel portion (204) of the exhaust system (200) has a first end portion (206), and a second end portion (208) opposite to the first end portion (206), and a body portion (210) connecting the first end portion (206) and the second end portion (208).
  • the first end portion (206) has a conical section.
  • the conical section of the first end portion (206) has a minimum diameter at a portion where it is connected to the first exhaust pipe portion (202). The diameter gradually increases along length thereof, and is maximum at a portion where the first end portion (206) is connected to the body portion (210).
  • the converging section of the first end portion (206) is provided to allow for expansion of the exhaust gases therewithin.
  • the second end portion (208) is shown to be straight, in alternative embodiments, the second end portion (208) may also have a conical section, without deviating from the spirit of the present invention.
  • the body portion (210) encloses an elongated channel having a predetermined diameter.
  • the body portion (210) also includes catalytic material disposed circumferentially within the elongated channel.
  • the catalytic material refers to materials such as palladium, platinum, and aluminum oxide etc., and all such materials that are adapted to catalytically oxidize the hydrocarbons and carbon monoxide with oxygen to form carbon dioxide and water.
  • the catalytic material includes any material or“high temperature materials” capable of operating under exhaust system conditions, that is, temperatures up to about 1,000° C. and exposure to hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur.
  • the catalytic material also referred to as catalytic substrate, is deposited in a first density Dl, within the body portion (210) of the first catalytic converter channel portion (204).
  • the density of catalytic substrate refers to the amount of catalytic materials, present per unit volume of the elongated channel within the body portion (210).
  • the body portion (210) of the first catalytic converter channel portion (204) allows passage of exhaust gases therethrough.
  • the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (210), and owing to presence of the catalytic material along the elongated channel, absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs.
  • the body portion (210) of the first catalytic converter channel portion (204) of the exhaust system (200) is positioned proximate to the exhaust port of the internal combustion engine (22), the temperature at which exhaust gases enter the body portion (210) is higher, allowing for efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
  • the second end portion (208) is connected to an intermediate channel portion (250).
  • the intermediate channel portion (250) includes a first edge (252), a second edge (254) positioned at a predefined angle with respect to the first edge (252), a third edge (250a), and a fourth edge (250b).
  • the first edge (252) is connected to the second end portion (208) of the first catalytic converter channel portion (204).
  • the second edge (254) is connected to the first end portion (262) of the second catalytic converter channel portion (260).
  • the third edge (250a) and the fourth edge (250b) are connected with the first edge (252) and the second edge (254).
  • the first edge (252) is positioned non-parallel with respect to the second edge (254).
  • the first edge (252), the second edge (254), the third edge (250a) and the fourth edge (250b) form a trapezoidal profile when viewed from a side of the two wheeled vehicle (100).
  • the first edge (252) and the second edge (254) is positioned at a predefined angle of 90 Degree with respect to each other, giving an “L” shaped angular profile to the intermediate channel portion (250).
  • the first edge (252) and the second edge (254) is positioned at a predefined angle of 120 Degree with respect to each other.
  • the first edge (252) and the second edge (254) may be positioned at any angle ranging between of 90 Degree to 120 Degree with respect to each other.
  • the first edge (252) of the intermediate channel portion (250) is connected to the second end portion (208) of the body portion (210).
  • the second edge (254) of the intermediate channel portion (250) is connected to a second catalytic converter channel portion (260). Between the first edge (252) and the second edge (254) of the intermediate channel portion (250), the angular profiled channel is defined.
  • the exhaust gases from the second end portion (208) of the body portion (210) of the first catalytic converter channel portion (204), are received within the intermediate channel portion (250). Owing to the angular or bent profile of the intermediate channel portion (250), the exhaust gases entering the intermediate channel portion (250) are made to change directions. As a result proper mixing of the exhaust gases takes places.
  • the second catalytic converter channel portion (260) of the exhaust system (200) has a first end portion (262), and a second end portion (264) opposite to the first end portion (262), and a body portion (266) connecting the first end portion (262) and the second end portion (264).
  • the body portion (266) of the second catalytic converter channel portion (260) of the exhaust system (200) has a predetermined length L2.
  • the body portion (266) encloses an elongated channel having a predetermined diameter, and having catalytic material disposed circumferentially within the elongated channel.
  • the catalytic material also referred to as catalytic substrate, is deposited in a second density D2, within the body portion (222) of the second catalytic converter channel portion (260).
  • the catalytic material of the second catalytic converter channel portion (260) includes any material or“high temperature materials” capable of operating under exhaust system conditions, that is, temperatures up to about 1,000° C. and exposure to hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur.
  • the body portion (266) allows passage of exhaust gases therethrough. During such passage of exhaust gases, the exhaust gases comes in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (266), and owing to presence of the catalytic material along the elongated channel, absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs. Since the body portion (266) of the second catalytic converter channel portion (260) of the exhaust system (200) is positioned proximate to the intermediate channel portion (250), the exhaust gases entering the body portion (266) have been in the channel with a bent profile.
  • the exhaust gases entering the body portion (266) are mixed, and absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases takes place in the second catalytic converter channel portion (260).
  • the second end portion (264) has a conical section.
  • the conical section of the second end portion (264) has a maximum diameter at a portion where it is connected to the body portion (266).
  • the diameter gradually decreases along length thereof, and is minimum at a portion where it is connected to a second exhaust pipe (268). Accordingly, the exhaust gases from the second catalytic converter channel portion (260) are communicated outside the exhaust system (200) by the second exhaust pipe (268).
  • the first catalytic converter channel portion (204) has a first predetermined length along an axis L 1
  • the second catalytic converter channel portion (260) has a second predetermined length along an axis L2.
  • the first predetermined length is greater than the second predetermined length.
  • the axis LI is positioned at an angle between 90 degree and 120 degree from the axis L2.
  • the internal combustion engine (22) the combustion of fuel within combustion chamber takes place causing creation of various exhaust gases. These exhaust gases are expelled from the combustion chamber through the exhaust port to the first exhaust pipe portion (202).
  • the first exhaust pipe portion (202) is connected to the first catalytic converter channel portion (204), and therefore, the exhaust gases are communicated to the first catalytic converter channel portion (204). Subsequently, the exhaust gases pass through the first catalytic converter channel portion (204), and during such passage, the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (210) and absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc.
  • the body portion (210) of the first catalytic converter channel portion (204) of the exhaust system (200) is positioned proximate to the exhaust port of the internal combustion engine (22), the temperature at which exhaust gases enter the body portion (210) is higher, allowing for a more efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
  • the exhaust gases subsequently pass through the intermediate channel portion (250).
  • the exhaust gases passing through the intermediate channel portion (250) are made to change directions, and tend to get a turbulent air flow. Resultantly, a proper mixing of the exhaust gases takes places takes place in the intermediate channel portion (250). Further, owing to the angular or bent profile of the intermediate channel portion (250), along with the absence of catalytic material within the intermediate channel portion (250), the exhaust gases passing through the intermediate channel portion (250), in addition to getting mixed, expand while and a small reduction in temperature thereof, takes place.
  • the second catalytic converter channel portion (260) connected to the intermediate channel portion (250) receive the exhaust gases.
  • the exhaust gases pass through the second catalytic converter channel portion (260), and come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (266). Due to the presence of the catalytic material along the elongated channel, absorption of a portion of remaining hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases takes place.
  • the second catalytic converter channel portion (260) of the exhaust system (200) is positioned proximate to the intermediate channel portion (250), the exhaust gases entering the body portion (266) have been in the channel with a bent profile and are properly mixed. Therefore, a remaining portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases is absorbed in the second catalytic converter channel portion (260).
  • the first catalytic converter channel portion (204) is proximate to the exhaust port of the engine (22), it receives exhaust gases at a higher temperature and absorption of substantial portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc.
  • the second catalytic converter channel portion (260) is positioned after the intermediate channel portion (250)
  • the second density D2 of catalytic material in the second catalytic converter channel portion (260) is allowed to be less that the first density D1 of catalytic material in the first catalytic converter channel portion (204). This results in substantial reduction of cost of the exhaust system (200).
  • a predetermined length L2 of the body portion (266) of the second catalytic converter channel portion (260) is substantially less as compared to the predetermined length LI of the body portion (210) of the first catalytic converter channel portion (204).
  • the reduction of length of the body portion (266) of the second catalytic converter channel portion (260) allows for easy packaging of the exhaust system (200) on the vehicle (100).
  • the reduction of length of the body portion (266) of the second catalytic converter channel portion (260) also reduces space occupied by the exhaust system (200).
  • the exhaust system (200) of the present invention facilitates packaging and placement of other components around the exhaust system (200).
  • the angular profile of the intermediate channel portion (250) causes proper mixing of the exhaust gases in the intermediate channel portion (250). Since the exhaust gases are allowed to mix and flow through the bent portion, the second catalytic converter channel portion (260) further absorbs the portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
  • the exhaust system (200) of the vehicle (100) achieves substantial reduction in levels of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases, allowing the vehicle (100) to meet stringent emission norms, in an economical manner.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

An internal combustion engine (22) is provided. The two wheeled vehicle (100) comprising: a frame (12); an internal combustion engine (22) carried by the frame (12); and an exhaust system (200) connected to the internal combustion engine (22). The exhaust system (200) comprises a first exhaust pipe portion (202) connected to an exhaust port of the internal combustion engine (22), a first catalytic converter channel portion (204), an intermediate channel portion (250), a second catalytic converter channel portion (260), and a second exhaust pipe (268). The first catalytic converter channel portion (204) includes catalytic substrate in a first density, and the second catalytic converter channel portion (260) includes catalytic substrate in a second density. The first catalytic converter channel portion (204) is at an angle with respect to the second catalytic converter channel portion (260).

Description

EXHAUST SYSTEM OF VEHICEE
FIEED OF INVENTION
[0001] The present invention relates to vehicles and, more particularly, to an exhaust system of a vehicle.
BACKGROUND
[0002] An exhaust system of an internal combustion engine of a saddle type vehicle is known where an exhaust gas purification device such as catalyst device is mounted on the downstream side of the exhaust port of the internal combustion engine to reduce the amount of pollutants from exhaust gases. Generally, the catalyst device is disposed in the exhaust path at a distance from the exhaust port of the internal combustion engine, as the exhaust pipe portion between the exhaust port of the engine and the catalyst device is directly exposed to the outside atmosphere there is a loss of heat from the exhaust gases. Hence, the temperature of the exhaust gases received at catalyst device may not be enough for efficient performance of the catalytic conversion. Thus, it is desired to dispose the catalyst device as close possible to the exhaust port.
[0003] Generally, the exhaust pipe extends horizontally from the exhaust port of the engine and then is bent to form a vertical section, the catalyst device is disposed in the vertical section of the exhaust pipe. Many times, the vertical section available is not sufficient to dispose the catalyst device. Catalyst device being a straight cylindrical shape, it has always been a challenge to dispose it in a curved portion of the exhaust pipe.
SUMMARY OF INVENTION
[0004] In one aspect of the present invention, a two wheeled vehicle is provided. The vehicle comprises a frame; an internal combustion engine carried by the frame; and an exhaust system connected to the internal combustion engine. The exhaust system comprises a first exhaust pipe portion connected to an exhaust port of the internal combustion engine , a first catalytic converter channel portion connected to the first exhaust pipe portion , an intermediate channel portion connected to the first catalytic converter channel portion , a second catalytic converter channel portion connected to the intermediate channel portion , and a second exhaust pipe connected to the second catalytic converter channel portion . The first catalytic converter channel portion includes catalytic substrate in a first density, and the second catalytic converter channel portion includes catalytic substrate in a second density. The first catalytic converter channel portion is at an angle with respect to the second catalytic converter channel portion. The first density of catalytic substrate is different from the second density of catalytic substrate. The first density of catalytic substrate is greater than the second density of catalytic substrate. In an embodiment, the first density of catalytic substrate is same as the second density of catalytic substrate.
[0005] Aforementioned configuration helps to reduce emission from the internal combustion engine. More specifically, as the exhaust gases pass through the first catalytic converter channel portion, during such passage, the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion and absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs. Further, since the body portion of the first catalytic converter channel portion of the exhaust system is positioned proximate to the exhaust port of the internal combustion engine, the temperature at which exhaust gases enter the body portion is higher, allowing for a more efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases. Moreover, since the first catalytic converter channel portion is connected to the intermediate channel portion, the exhaust gases subsequently pass through the intermediate channel portion. Owing to the angular or bent profile of the intermediate channel portion, the exhaust gases passing through the intermediate channel portion are made to change directions, and tend to get a turbulent air flow. Resultantly, a proper mixing of the exhaust gases takes places takes place in the intermediate channel portion. Further, the second catalytic converter channel portion is connected to the intermediate channel portion receive the exhaust gases. The exhaust gases pass through the second catalytic converter channel portion, and come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion.
[0006] In an embodiment of the present invention, the intermediate channel portion comprises, a first edge connected to the second end portion of the first catalytic converter channel portion , a second edge connected to the first end portion of the second catalytic converter channel portion , a third edge , and a fourth edge , wherein the third edge and the fourth edge are connected with the first edge and the second edge . The first edge is positioned non-parallel with respect to the second edge. The first edge, the second edge, the third edge and the fourth edge form a trapezoidal profile when viewed from a side of the two wheeled vehicle. The intermediate channel portion connects the first catalytic converter channel portion with the second catalytic converter channel portion at an angle between 90 degree and 120 degree. A first end portion of the first catalytic converter channel portion is connected to the first exhaust pipe portion, and a second end portion of the second catalytic converter channel portion is connected to the second exhaust pipe. The intermediate channel portion connects the first catalytic converter channel portion with the second catalytic converter channel portion at an angle between 90 degree and 120 degree.
[0007] Owing to such connection of the first catalytic converter channel portion with the second catalytic converter channel portion at an angle between 90 degree and 120 degree, i.e., the angular or bent profile of the intermediate channel portion , coupled with the fact that there is absence of catalytic material within the intermediate channel portion , the exhaust gases passing through the intermediate channel portion , in addition to getting mixed, expand and a small reduction in temperature thereof, takes place.
[0008] In another embodiment, the first catalytic converter channel portion has a first predetermined length along an axis LI, and the second catalytic converter channel portion has a second predetermined length along an axis L2. The first predetermined length is greater than the second predetermined length. The axis LI is positioned at an angle between 90 degree and 120 degree from the axis L2.
[0009] Since the present invention allows for having different lengths of catalytic substrate portion, the present invention allows for saving of cost associated with the catalytic substrate. This also tends to result in substantial reduction of cost of the exhaust system.
BRIEF DESCRIPTION OF DRAWINGS
[00010] The invention itself, together with further features and attended advantages, will become apparent from consideration of the following detailed description, taken in conjunction with the accompanying drawings. One or more embodiments of the present invention are now described, by way of example only wherein like reference numerals represent like elements and in which:
[00011] Figure 1 illustrates a side view of an exemplary two wheeled vehicle, according to an embodiment of the present invention;
[00012] Figure 2 illustrates a view of a portion of the exemplary two wheeled vehicle, according to an embodiment of the present invention
[00013] Figure 3 illustrates a view of an exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention; [00014] Figure 4 illustrates view of a portion of the exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention; and
[00015] Figure 5 illustrates view of a portion of the exhaust system of the exemplary two wheeled vehicle, in accordance with an embodiment of the present invention.
[00016] The drawings referred to in this description are not to be understood as being drawn to scale except if specifically noted, and such drawings are only exemplary in nature. DETAILED DESCRIPTION
[00017] While the invention is susceptible to various modifications and alternative forms, an embodiment thereof has been shown by way of example in the drawings and will be described here below. It should be understood, however that it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the invention is to cover all modifications, equivalents, and alternative falling within the spirit and the scope of the invention.
[00018] The term“comprises”, comprising, or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a setup, structure or method that comprises a list of components or steps does not include only those components or steps but may include other components or steps not expressly listed or inherent to such setup or structure or method. In other words, one or more elements in a system or apparatus proceeded by“comprises... a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or apparatus.
[00019] For better understanding of this invention, reference would now be made to the embodiment illustrated in the accompanying Figures and description here below, further, in the following Figures, the same reference numerals are used to identify the same components in various views. [00020] While the present invention is illustrated in the context of a vehicle, however, exhaust systems, and aspects and features thereof can be used with other type of vehicles as well. The terms “vehicle”, “two wheeled vehicle” and “motorcycle” have been interchangeably used throughout the description. The term “vehicle” comprises vehicles such as motorcycles, scooters, bicycles, mopeds, scooter type vehicle, All-Terrain Vehicles (ATV) and the like.
[00021] The terms“front / forward”,“rear / rearward / back / backward”,“up / upper / top”,“down / lower / lower ward / downward, bottom”,“left / leftward”,“right / rightward” used therein represents the directions as seen from a vehicle driver sitting astride and these directions are referred by arrows Fr, Rr, U, Lr, L, R in the Figures.
[00022] Referring to Figures 1, a vehicle (100) according to an embodiment of the present invention is illustrated. The vehicle (100) referred to herein, embodies a two wheeled motorcycle. Alternatively, the vehicle (100) may embody any other ridden vehicles such as scooters, three-wheeled vehicles, All-Terrain Vehicles (ATV) etc. without limiting the scope of the invention.
[00023] The vehicle (100) comprises one or more body parts, such as a frame (12), a handle bar (14), a front wheel (16), a seat (18), a rear wheel (20), an engine (22), a headlight (24), and a fuel tank (26). The frame (12) supports the engine (22) in middle portion of the vehicle (100). In the illustrated example, the engine (22) provides necessary power required to drive the rear wheel (20) of the vehicle (100). Alternatively, the engine (22) may provide necessary power to the drive the front wheel (16), or both the front wheel (16) and the rear wheel (20) simultaneously, without limiting the scope of the invention. The rear wheel (20) is linked to the engine
(22) through a transmission mechanism (not numbered).
[00024] The frame (12) supports the seat (18) which extends from middle portion towards rear portion of the vehicle (100). The seat (18) provides seating for a rider and / or a passenger of the vehicle (100). The fuel tank (26) provides necessary fuel to the engine (22) to generate power within the vehicle (100).
[00025] The frame ( 12) of the vehicle ( 100) also supports an exhaust system (200) of the internal combustion engine (22). The fuel is supplied to the internal combustion engine (22) from the fuel tank (26) through a fuel inlet system (not illustrated). The combustion of fuel takes place in a combustion chamber (not illustrated) of the internal combustion engine (22). As will be apparent to those skilled in the art that the combustion of fuel within combustion chamber of the internal combustion engine (22) causes creation of various gases, called exhaust gases. The exhaust gases are expelled from the combustion chamber through an exhaust port (not illustrated). The exhaust system (200) of the internal combustion engine (22) is connected to the exhaust port of the combustion chamber.
[00026] As shown in Figure. 2 and Figure 3, in accordance to an embodiment of the present invention, the exhaust system (200) includes a first exhaust pipe portion (202) connected to the exhaust port of the internal combustion engine (22). The exhaust gases, expelled by the internal combustion engine (22) are collected by the first exhaust pipe portion (202) through the exhaust port, therefore temperature at which the exhaust gases are received is high. Specifically, the first exhaust pipe portion (202), also referred to as a front exhaust pipe portion, has a first end portion (not numbered) connected to the exhaust port, and a second end portion (not numbered) connected to a first catalytic converter channel portion (204).
[00027] As shown in Figure. 4, the first catalytic converter channel portion (204) of the exhaust system (200) has a first end portion (206), and a second end portion (208) opposite to the first end portion (206), and a body portion (210) connecting the first end portion (206) and the second end portion (208). In an embodiment, the first end portion (206) has a conical section. Specifically, the conical section of the first end portion (206) has a minimum diameter at a portion where it is connected to the first exhaust pipe portion (202). The diameter gradually increases along length thereof, and is maximum at a portion where the first end portion (206) is connected to the body portion (210). The converging section of the first end portion (206) is provided to allow for expansion of the exhaust gases therewithin. Although, in the present embodiment, the second end portion (208) is shown to be straight, in alternative embodiments, the second end portion (208) may also have a conical section, without deviating from the spirit of the present invention. [00028] The body portion (210) of the first catalytic converter channel portion
(204) of the exhaust system (200) has a predetermined length LI. The body portion (210) encloses an elongated channel having a predetermined diameter. The body portion (210) also includes catalytic material disposed circumferentially within the elongated channel. The catalytic material refers to materials such as palladium, platinum, and aluminum oxide etc., and all such materials that are adapted to catalytically oxidize the hydrocarbons and carbon monoxide with oxygen to form carbon dioxide and water. The catalytic material includes any material or“high temperature materials” capable of operating under exhaust system conditions, that is, temperatures up to about 1,000° C. and exposure to hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur. In an embodiment, the catalytic material, also referred to as catalytic substrate, is deposited in a first density Dl, within the body portion (210) of the first catalytic converter channel portion (204). The density of catalytic substrate refers to the amount of catalytic materials, present per unit volume of the elongated channel within the body portion (210).
[00029] The body portion (210) of the first catalytic converter channel portion (204) allows passage of exhaust gases therethrough. During such passage of exhaust gases, the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (210), and owing to presence of the catalytic material along the elongated channel, absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs. Since the body portion (210) of the first catalytic converter channel portion (204) of the exhaust system (200) is positioned proximate to the exhaust port of the internal combustion engine (22), the temperature at which exhaust gases enter the body portion (210) is higher, allowing for efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
[00030] In an embodiment of the present disclosure, the second end portion (208) is connected to an intermediate channel portion (250). Specifically, the intermediate channel portion (250) includes a first edge (252), a second edge (254) positioned at a predefined angle with respect to the first edge (252), a third edge (250a), and a fourth edge (250b). The first edge (252) is connected to the second end portion (208) of the first catalytic converter channel portion (204). The second edge (254) is connected to the first end portion (262) of the second catalytic converter channel portion (260). The third edge (250a) and the fourth edge (250b) are connected with the first edge (252) and the second edge (254). The first edge (252) is positioned non-parallel with respect to the second edge (254). In an embodiment, the first edge (252), the second edge (254), the third edge (250a) and the fourth edge (250b) form a trapezoidal profile when viewed from a side of the two wheeled vehicle (100).
[00031] In an embodiment, the first edge (252) and the second edge (254) is positioned at a predefined angle of 90 Degree with respect to each other, giving an “L” shaped angular profile to the intermediate channel portion (250). In another embodiment, the first edge (252) and the second edge (254) is positioned at a predefined angle of 120 Degree with respect to each other. In further examples, the first edge (252) and the second edge (254) may be positioned at any angle ranging between of 90 Degree to 120 Degree with respect to each other.
[00032] The first edge (252) of the intermediate channel portion (250) is connected to the second end portion (208) of the body portion (210). The second edge (254) of the intermediate channel portion (250) is connected to a second catalytic converter channel portion (260). Between the first edge (252) and the second edge (254) of the intermediate channel portion (250), the angular profiled channel is defined. The exhaust gases from the second end portion (208) of the body portion (210) of the first catalytic converter channel portion (204), are received within the intermediate channel portion (250). Owing to the angular or bent profile of the intermediate channel portion (250), the exhaust gases entering the intermediate channel portion (250) are made to change directions. As a result proper mixing of the exhaust gases takes places. Further, owing to the angular or bent profile of the intermediate channel portion (250), along with the absence of catalytic material within the intermediate channel portion (250), the exhaust gases entering the intermediate channel portion (250), in addition to getting mixed, expand while a small reduction in temperature thereof, also takes place.
[00033] The second catalytic converter channel portion (260) of the exhaust system (200) has a first end portion (262), and a second end portion (264) opposite to the first end portion (262), and a body portion (266) connecting the first end portion (262) and the second end portion (264). The body portion (266) of the second catalytic converter channel portion (260) of the exhaust system (200) has a predetermined length L2. The body portion (266) encloses an elongated channel having a predetermined diameter, and having catalytic material disposed circumferentially within the elongated channel. In an embodiment, the catalytic material, also referred to as catalytic substrate, is deposited in a second density D2, within the body portion (222) of the second catalytic converter channel portion (260). The catalytic material of the second catalytic converter channel portion (260) includes any material or“high temperature materials” capable of operating under exhaust system conditions, that is, temperatures up to about 1,000° C. and exposure to hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur.
[00034] The body portion (266) allows passage of exhaust gases therethrough. During such passage of exhaust gases, the exhaust gases comes in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (266), and owing to presence of the catalytic material along the elongated channel, absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs. Since the body portion (266) of the second catalytic converter channel portion (260) of the exhaust system (200) is positioned proximate to the intermediate channel portion (250), the exhaust gases entering the body portion (266) have been in the channel with a bent profile. Resultantly, the exhaust gases entering the body portion (266) are mixed, and absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases takes place in the second catalytic converter channel portion (260).
[00035] In an embodiment, the second end portion (264) has a conical section. Specifically, the conical section of the second end portion (264) has a maximum diameter at a portion where it is connected to the body portion (266). The diameter gradually decreases along length thereof, and is minimum at a portion where it is connected to a second exhaust pipe (268). Accordingly, the exhaust gases from the second catalytic converter channel portion (260) are communicated outside the exhaust system (200) by the second exhaust pipe (268).
[00036] The first catalytic converter channel portion (204) has a first predetermined length along an axis L 1 , and the second catalytic converter channel portion (260) has a second predetermined length along an axis L2. The first predetermined length is greater than the second predetermined length. The axis LI is positioned at an angle between 90 degree and 120 degree from the axis L2.
[00037] During operation of the vehicle (100), the internal combustion engine (22) the combustion of fuel within combustion chamber takes place causing creation of various exhaust gases. These exhaust gases are expelled from the combustion chamber through the exhaust port to the first exhaust pipe portion (202). The first exhaust pipe portion (202) is connected to the first catalytic converter channel portion (204), and therefore, the exhaust gases are communicated to the first catalytic converter channel portion (204). Subsequently, the exhaust gases pass through the first catalytic converter channel portion (204), and during such passage, the exhaust gases come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (210) and absorption of at least a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases occurs. Further, since the body portion (210) of the first catalytic converter channel portion (204) of the exhaust system (200) is positioned proximate to the exhaust port of the internal combustion engine (22), the temperature at which exhaust gases enter the body portion (210) is higher, allowing for a more efficient absorption of a portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases.
[00038] Since the first catalytic converter channel portion (204) is connected to the intermediate channel portion (250), the exhaust gases subsequently pass through the intermediate channel portion (250). Owing to the angular or bent profile of the intermediate channel portion (250), the exhaust gases passing through the intermediate channel portion (250) are made to change directions, and tend to get a turbulent air flow. Resultantly, a proper mixing of the exhaust gases takes places takes place in the intermediate channel portion (250). Further, owing to the angular or bent profile of the intermediate channel portion (250), along with the absence of catalytic material within the intermediate channel portion (250), the exhaust gases passing through the intermediate channel portion (250), in addition to getting mixed, expand while and a small reduction in temperature thereof, takes place.
[00039] Thereafter, the second catalytic converter channel portion (260) connected to the intermediate channel portion (250) receive the exhaust gases. The exhaust gases pass through the second catalytic converter channel portion (260), and come in contact with the catalytic material disposed circumferentially within the elongated channel of the body portion (266). Due to the presence of the catalytic material along the elongated channel, absorption of a portion of remaining hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. present in the exhaust gases takes place. Further, since the second catalytic converter channel portion (260) of the exhaust system (200) is positioned proximate to the intermediate channel portion (250), the exhaust gases entering the body portion (266) have been in the channel with a bent profile and are properly mixed. Therefore, a remaining portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases is absorbed in the second catalytic converter channel portion (260).
[00040] Since the first catalytic converter channel portion (204) is proximate to the exhaust port of the engine (22), it receives exhaust gases at a higher temperature and absorption of substantial portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc., whereas the second catalytic converter channel portion (260) is positioned after the intermediate channel portion (250), the second density D2 of catalytic material in the second catalytic converter channel portion (260) is allowed to be less that the first density D1 of catalytic material in the first catalytic converter channel portion (204). This results in substantial reduction of cost of the exhaust system (200).
[00041] Further, since the absorption of substantial portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. occurs in the first catalytic converter channel portion (204), a predetermined length L2 of the body portion (266) of the second catalytic converter channel portion (260) is substantially less as compared to the predetermined length LI of the body portion (210) of the first catalytic converter channel portion (204). The reduction of length of the body portion (266) of the second catalytic converter channel portion (260) allows for easy packaging of the exhaust system (200) on the vehicle (100). Moreover, the reduction of length of the body portion (266) of the second catalytic converter channel portion (260), also reduces space occupied by the exhaust system (200). Advantageously, the exhaust system (200) of the present invention facilitates packaging and placement of other components around the exhaust system (200). [00042] In addition, the angular profile of the intermediate channel portion (250) causes proper mixing of the exhaust gases in the intermediate channel portion (250). Since the exhaust gases are allowed to mix and flow through the bent portion, the second catalytic converter channel portion (260) further absorbs the portion of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases. Resultantly, the exhaust system (200) of the vehicle (100) achieves substantial reduction in levels of hydrocarbons, nitrous oxides, carbon monoxide, carbon dioxide and/or sulfur etc. from the exhaust gases, allowing the vehicle (100) to meet stringent emission norms, in an economical manner.
[00043] While few embodiments of the present invention have been described above, it is to be understood that the invention is not limited to the above embodiments and modifications may be appropriately made thereto within the spirit and scope of the invention. [00044] While considerable emphasis has been placed herein on the particular features of this invention, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiments without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.

Claims

We claim:
1. A two wheeled vehicle ( 100) comprising:
a frame (12);
an internal combustion engine (22) carried by the frame (12); and
an exhaust system (200) connected to the internal combustion engine (22), the exhaust system (200) comprising,
a first exhaust pipe portion (202) connected to an exhaust port of the internal combustion engine (22),
a first catalytic converter channel portion (204) connected to the first exhaust pipe portion (202),
an intermediate channel portion (250) connected to the first catalytic converter channel portion (204),
a second catalytic converter channel portion (260) connected to the intermediate channel portion (250), and
a second exhaust pipe (268) connected to the second catalytic converter channel portion (260),
wherein the first catalytic converter channel portion (204) includes catalytic substrate in a first density, and the second catalytic converter channel portion (260) includes catalytic substrate in a second density, and
wherein the first catalytic converter channel portion (204) is at an angle with respect to the second catalytic converter channel portion (260).
2. The two wheeled vehicle (100) as claimed in claim 1, wherein the first density of catalytic substrate is different from the second density of catalytic substrate.
3. The two wheeled vehicle (100) as claimed in claim 2, wherein the first density of catalytic substrate is greater than the second density of catalytic substrate.
4. The two wheeled vehicle (100) as claimed in claim 1, wherein the first density of catalytic substrate is same as the second density of catalytic substrate.
5. The two wheeled vehicle (100) as claimed in claim 1, wherein the intermediate channel portion (250) comprises,
a first edge (252) connected to the second end portion (208) of the first catalytic converter channel portion (204),
a second edge (254) connected to the first end portion (262) of the second catalytic converter channel portion (260),
a third edge (250a), and
a fourth edge (250b), wherein the third edge (250a) and the fourth edge (250b) are connected with the first edge (252) and the second edge (254), wherein the first edge (252) is positioned non-parallel with respect to the second edge (254).
6. The two wheeled vehicle (100) as claimed in claim 5, wherein the first edge (252), the second edge (254), the third edge (250a) and the fourth edge (250b) form a trapezoidal profile when viewed from a side of the two wheeled vehicle (100).
7. The two wheeled vehicle (100) as claimed in claim 5, wherein the intermediate channel portion (250) connects the first catalytic converter channel portion (204) with the second catalytic converter channel portion (260) at an angle between 90 degree and 120 degree,
wherein a first end portion (206) of the first catalytic converter channel portion (204) is connected to the first exhaust pipe portion (202), and a second end portion (264) of the second catalytic converter channel portion (260) is connected to the second exhaust pipe (268).
8. The two wheeled vehicle (100) as claimed in claim 1, wherein the intermediate channel portion (250) connects the first catalytic converter channel portion (204) with the second catalytic converter channel portion (260) at an angle between 90 degree and 120 degree.
9. The two wheeled vehicle (100) as claimed in claim 8, wherein the first catalytic converter channel portion (204) has a first predetermined length along an axis LI, and the second catalytic converter channel portion (260) has a second predetermined length along an axis L2,
wherein the first predetermined length is greater than the second predetermined length, and
wherein the axis LI is positioned at an angle between 90 degree and 120 degree from the axis L2.
10. The two wheeled vehicle (100) as claimed in claim 1, wherein the intermediate channel portion (250) forms a hollow cavity free from catalytic substrate.
~ i7 ~
PCT/IN2019/050948 2018-12-26 2019-12-23 Exhaust system of vehicle WO2020136676A1 (en)

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CONC2021/0008255A CO2021008255A2 (en) 2018-12-26 2021-06-24 Vehicle exhaust system

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IN201811049096 2018-12-26

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EP4026993A1 (en) * 2021-01-08 2022-07-13 Suzuki Motor Corporation Exhaust device

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EP2871341A1 (en) * 2013-11-07 2015-05-13 Toyota Jidosha Kabushiki Kaisha Catalytic converter
EP2960457B1 (en) * 2013-02-20 2017-10-18 Honda Motor Co., Ltd. Exhaust purification device

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WO2006020211A2 (en) * 2004-08-02 2006-02-23 Arvin Technologies, Inc. Catalytic converter and associated method of assembly
EP2960457B1 (en) * 2013-02-20 2017-10-18 Honda Motor Co., Ltd. Exhaust purification device
EP2871341A1 (en) * 2013-11-07 2015-05-13 Toyota Jidosha Kabushiki Kaisha Catalytic converter

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4026993A1 (en) * 2021-01-08 2022-07-13 Suzuki Motor Corporation Exhaust device
US11686238B2 (en) 2021-01-08 2023-06-27 Suzuki Motor Corporation Exhaust device

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