NATURALLY ASPIRATED COMMON RAIL DIESEL ENGINE MEETING ULTRA LOW PM EMISSION BY PASSIVE EXHAUST AFTER TREATMENT

• US 20160169164A1
• Filed: 07/23/2014
• Published: 06/16/2016
• Est. Priority Date: 07/23/2013
• Status: Abandoned Application

• Current Assignee: Mahindra & Mahindra Limited
• Original Assignee: Mahindra & Mahindra Limited
• Inventors: VELUSAMY, R, Ray, Dipankar, SADANAND, BHOSALE, PRAVESH, HIRANANDANI, SANTOSH, RANE, SURESH, R, ATMARAM, DALVI, DEEPAK, S
• Application Number:
  US14/907,234
• Publication Number:
  US 20160169164A1
• Time in Patent Office: Days
• CPC Class Codes: F01N 13/10 of exhaust manifolds with cooling jacket F01N3/046
• CPC Class Codes: F01N 2340/02 characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
• CPC Class Codes: F01N 3/10 by thermal or catalytic conversion of noxious components of exhaust by using other chemical processes, chemical aspects of catalytic conversion, e.g. using specified catalysts, B01D53/34
• CPC Class Codes: F01N 3/20 specially adapted for catalytic conversion F01N3/22 takes precedence; Methods of operation or control of catalytic converters
• CPC Class Codes: F02D 21/08 the other gas being the exhaust gas of engine
• CPC Class Codes: F02D 2200/021 Engine temperature
• CPC Class Codes: F02D 2200/0404 Throttle position
• CPC Class Codes: F02D 2200/703 Atmospheric pressure
• CPC Class Codes: F02D 41/0077 Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position EGR valve position sensor F02M26/48
• CPC Class Codes: F02D 41/029 the exhaust gas treating apparatus being a particulate filter
• CPC Class Codes: F02M 26/15 in relation to engine exhaust purifying apparatus
• CPC Class Codes: F02M 26/19 Means for improving the mixing of air and recirculated exhaust gases, e.g. venturis or multiple openings to the intake system
• CPC Class Codes: F02M 26/29 Constructional details of the coolers, e.g. pipes, plates, ribs, insulation or materials
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A system (100) for controlling emissions of exhaust gases in said naturally aspirated engine is disclosed. The system includes an open loop exhaust gas recirculation flow. The system (100) further includes a catalyst (102) mounted at exhaust manifold (106) of the engine. Furthermore the system (100) includes an exhaust gas mixing tube inserted into intake elbow (104) (mixing tube). The system (100) further includes an exhaust gas recirculation valve (110) mounted on cold side of EGR cooler. Furthermore, the system (100) includes an electronic control unit to control exhaust gas recirculation valve (110) along with various other engine calibration parameters.

Claims

1. A system (100) for controlling emissions of exhaust gases in an internal combustion engine having an open loop control of exhaust gas recirculation flow, said system (100) comprising:

a catalyst (102) closely coupled to exhaust manifold (106) of the engine having a passive Particulate Matter filter;

an exhaust gas mixing tube inserted into an intake elbow (104) (mixing pipe) for mixing exhaust gas with fresh air uniformly; and

an exhaust gas recirculation valve (110) integrated on cold side of EGR circuit;

wherein

said exhaust gas recirculation valve (110) consists of a position control mechanism to calculate required EGR rate depending on engine speed, throttle position and ambient pressure and coolant temperature conditions.

2. The system (100) as claimed in claim 1, wherein said catalyst (102) is selected from a group comprising of possible combination and loading of precious metal.

3. The system (100) as claimed in claim 1, wherein a common rail fuel injection system is used for injecting fuel.

4. The system (100) as claimed in claim 1, wherein an EGR cooler (115) is mounted upstream of the exhaust gas recirculation valve (110) for cooling the engine exhaust gases before it reach air intake elbow.

5. The system (100) as claimed in claim 1, wherein said system (100) meets Off High Way US EPA TIER-4(F) emission norms.

6. A method for controlling emissions of exhaust gases in a naturally aspirated engine having an open loop EGR comprising:

mapping an injected fuel quantity and demanded EGR valve position as function of engine speed &

Throttle Demand; and

controlling EEGR valve position by a position feedback mechanism;

wherein

said system works with an open loop EGR system where emission control is done based on calibrated base or corrections maps;

said correction maps are selected based on engine coolant temperature.