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EP-3673159-B1 - HYDROCARBON DOSING SYSTEM

EP3673159B1EP 3673159 B1EP3673159 B1EP 3673159B1EP-3673159-B1

Inventors

  • SHAH, NIRAV

Dates

Publication Date
20260506
Application Date
20191108

Claims (9)

  1. A hydrocarbon dosing system, the system comprising: a housing (120) comprising a first inlet (102) to facilitate inflow of a first fluid into the housing (120), a second inlet (104) to facilitate inflow of a second fluid into the housing (120), and an outlet (116) to facilitate outflow of any or a combination of the first fluid and the second fluid from the housing, wherein the first inlet (102), the second inlet (104), and the outlet (116) are fluidically coupled to each other through a first conduit (110); at least one fluid flow enabler (106, 112, 802) disposed at least partially inside the housing (120) and operatively coupled to the first inlet (102) and the second inlet (104), the at least one fluid flow enabler (106, 112, 802) configured to control flow of any or a combination of the first fluid, and the second fluid from the first inlet and the second inlet to the outlet (116); and a common fluid flow enabler (108) disposed at least partially inside the housing (120), the common fluid flow enabler (108) configured to control flow of the first fluid and the second fluid inside the housing (120) to facilitate dosing of the first fluid and the second fluid to provide a dosed fluid; characterized in that the at least one fluid flow enabler (106, 112, 802) comprises a first plunger (602) configured to seal a first orifice (604) of the at least one fluid flow enabler (106, 112, 802) due to pressure applied by the second fluid, thereby providing an intrinsic non-return check valve mechanism to restrict flow of the first fluid towards the second inlet (104), and restrict flow of the second fluid towards the first inlet (102).
  2. The system (100) as claimed in claim 1, wherein the system (100) comprises at least one pressure sensor (114) to monitor pressure of any or a combination of the first fluid and the second fluid inside the housing (120).
  3. The system (100) as claimed in claim 2, wherein the system (100) is configured to provide an intrinsic pressure relief valve mechanism to control pressure of the second fluid inside the housing (120) and enable controlled discharge of the second fluid from the housing (120) when the pressure of the second fluid inside the housing (120) exceeds a predefined pressure.
  4. The system (100) as claimed in claim 2, wherein the system (100) comprises a control unit (118) operatively coupled to the at least one fluid flow enabler (106, 112, 802), the common fluid flow enabler (108), and the at last one pressure sensor (114), and wherein the control unit (118) is configured to control the at least one fluid flow enabler (106, 112, 802), and the common fluid flow enabler (108) to regulate the flow of any or a combination of the first fluid and the second fluid through the system (100).
  5. The system (100) as claimed in claim 1, wherein the at least one fluid flow enabler (106, 112, 802) and the common fluid flow enabler (108) are solenoid valves, and wherein the at least one fluid flow enabler (106, 112) comprises: a first fluid flow enabler (106) operatively coupled to the first inlet (102) and configured to control flow of the first fluid in the housing (120); and a second fluid flow enabler (112) operatively coupled to the second inlet (104) and configured to control flow of the second fluid in the housing (120).
  6. The system (100) as claimed in claim 1, wherein the at least one fluid flow enabler is a 3/2 solenoid valve (802) provided with a valve outlet (808), and two valve inlets (804, 806) comprising a first valve inlet (804) and a second valve inlet (806), and wherein the first valve inlet (804) is fluidically coupled to the first inlet (102), the second valve inlet (806) is fluidically coupled to the second inlet (104), and the valve outlet (808) is fluidic ally coupled to the outlet (116).
  7. The system (100) as claimed in claim 1, wherein the housing (120) is configured to accommodate at least one check valve (208), and wherein the at least one check valve (208) is configured to restrict flow of the first fluid towards the second inlet (104), and flow of the second fluid towards the first inlet (102), when the system is in operating condition.
  8. The system (100) as claimed in claim 1, wherein the system (100) comprises a nozzle coupled to the outlet (116) through a dosing conduit to regulate outflow of any or a combination of the first fluid, the second fluid, and the dosed fluid from the outlet (116).
  9. The system (100) as claimed in claim 1, wherein the at least one fluid flow enabler (106, 112, 802) is configured to allow flow of the first fluid from the first inlet (102) to the outlet (116) to facilitate purging of any or a combination of the first conduit (110), the outlet (116), the dosing conduit, and the nozzle.

Description

PRIORITY TECHNICAL FIELD The present disclosure relates to the field of hydrocarbon dosing system. More particularly, the present disclosure relates to a hydrocarbon dosing system to control dosingof diesel fuel into an exhaust upstream of a vehicle's oxidation catalyst. BACKGROUND Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art. Exhaust gases emitted from motor vehicles have been the major source of air pollution. This has forced government and federal bodies all over the world to institute stringent norms and standards to regulate the output of air pollutants from motor vehicle's engine. Automobile and engine manufacturers are bound to follow these stringent norms and develop emission improvement strategies and technologies for motor vehicle's engine. Efforts have been made around reducing air pollutants such as particulate matters, hydrocarbon and carbon monoxide, nitrogen oxide, etc. from the exhaust gases emitted by the engine. Diesel oxidation catalyst (DOC) is one of the aftermath components used in diesel engines that are designed to convert highly toxic air pollutants such as carbon monoxide and unburned hydrocarbons into carbon dioxide and water. DOC is being implemented in all diesel engine vehicles to meet these vehicle norms and standard. Diesel engine vehicle incorporates a hydrocarbon dosing system to provide controlled dosing of diesel fuel and air into an exhaust upstream of vehicle's DOC. Various hydrocarbon dosing systems are available in the automobile industry to provide dosing of diesel fuel and air into vehicle's DOC. Present hydrocarbon dosing systems incorporate separate inlets for diesel fuel and air to enter into a dosing channel. The dosing channel is connected to a nozzle to purge out the diesel fuel. The available dosing systems have several drawbacks such as reverse flow of diesel fuel into the air inlet line, and vice versa, which increases malfunction possibilities in the dosing system. Another drawback of currently available dosing system is increased resistance to the flow of fluids in the inside the dosing system. Patent document US2006101810A1 discloses a system for dispensing fuel into a transient flow of an exhaust system to control exhaust emissions, having a controller that initiates the delivery of fuel into the exhaust when an emissions control device, such as a diesel particulate filter, requires increased exhaust temperatures for regeneration. In operation, pressurized fuel and pressurized air are supplied to a fuel delivery device, wherein a fuel injector pre-mixes fuel with air. The fuel-air mixture is then dispensed into the exhaust flow through a nozzle, causing a rapid pressure drop in the mixture that results in the pressurized air expanding rapidly, breaking the fuel spray into fine particles. US2008302089A1 discloses a system for dispensing a mixture of a reactant and pressurized air into the exhaust stream. This system includes a mixing manifold that mounts to an exhaust pipe that carries the exhaust stream. The system also includes a metering device remotely mounted from the mixing manifold. WO2007091969A1 discloses a device for injection of a fuel or reducing agent into exhaust line from a combustion engine comprising a nozzle arrangement having a nozzle head from which the liquid agent is injectable into the exhaust line. The nozzle arrangement comprises a first conduit leading to the nozzle head for supply of compressed gas, preferably in the form of compressed air, to the nozzle head, and a second conduit leading to the nozzle head for supply of said liquid agent to the nozzle head. The nozzle head is provided with at least one outlet opening connected to the first conduit and to the second conduit, through which outlet opening said liquid agent is injectable into the exhaust line under atomization thereof after mixing with compressed gas in a mixing zone inside the nozzle head. WO2009026327A1 discloses a diesel dosing module having a diesel fuel shut-off valve, a diesel fuel dosing valve to provide dosing fuel to the inlet of a diesel oxidation catalyst and an air purge valve to purge fuel from a dosing line attached to the diesel dosing module and from a nozzle attached to a distal end of the dosing line. The valves are attached to a housing manifold, which is remotely positioned from the nozzle and the high heat areas of the vehicle. Dosing systems available in the market incorporate multiple valves such as a check valve or non-return valve (NRV) to restrict the flow of diesel fuel in the channel of the dosing system, and vice versa. Another set of pressure relief valve are incorporated in dosing systems for releasing pressure of the dosing system in case the pressure inside the dosing system