DESC:FORM 2
The Patent Act 1970
(39 of 1970)
&
The Patent Rules, 2005

COMPLETE SPECIFICATION
(SEE SECTION 10 AND RULE 13)

TITLE OF THE INVENTION

“SYSTEM AND METHOD FOR CONTROLLING EGR VALVE OF AN ENGINE IN A GENSET”

APPLICANTS:
Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra Research Valley, Mahindra World, City Plot No. 41/1, Anjur P.O. Chengalpattu, Kancheepuram Dist, Tamilnadu.- 603204

The following specification particularly describes and ascertains the nature of this invention and the manner in which it is to be performed:-

TECHNICAL FIELD
[001] The embodiments herein generally relate to emission control systems in internal combustion engines, and more particularly but not exclusively to exhaust gas recirculation systems in engines of gensets.

BACKGROUND
[002] During the operation of an internal combustion engine certain pollutants are emitted out in the exhaust gases. These gases generally consist of oxides of nitrogen (NOx), carbon monoxide (CO) and un-burnt particulate matter (PM). Emissions of such pollutants are very harmful to the environment.
[003] Exhaust gas recirculation (EGR) is one type of emission control system in which a part of engine’s exhaust is recirculated back to the engine. Due to the inert nature of exhaust gases, the formation of NOx is limited. However, during starting of the engine and during transient loading or unloading a huge amount of smoke is produced by the engine due to exhaust gas recirculation.
[004] Further, when the engine is in over heated condition the exhaust gas recirculation may be detrimental to the engine as the exhaust gases are at high temperature they add more heat to the overheated engine.
[005] Conventionally to control the exhaust gas recirculation valve, the engine control unit is provided with input from manifold absolute pressure sensor and throttle position sensor of the engine. These sensors incur additional cost and complexity for engines used in gensets.
[006] Therefore, there exists a need for a simple and a cost effective system and a method for controlling an exhaust gas recirculation valve of an engine in a genset. Further, there exists a need for a system and method that can eliminate the aforementioned drawbacks.

OBJECTS
[007] The principle object of an embodiment of this invention is to provide a system and a method for controlling exhaust gas recirculation valve of an engine in a genset.
[008] Another object of an embodiment of this invention is provide a system and a method for controlling exhaust gas recirculation valve of an engine in a genset using existing sensor and component of the genset.
[009] These and other objects of the embodiments herein will be better appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF FIGURES
[0010] The embodiments of this invention is illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0011] FIG. 1 depicts the schematic of the system according to an embodiment of the invention as disclosed herein; and
[0012] FIG. 2 depicts the flow chart of the method according to an embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0013] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0014] The embodiments herein achieve a system and a method for controlling exhaust gas recirculation valve of an engine in a genset. Referring now to the drawings, and more particularly to FIGS. 1 through 2, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0015] FIG. 1 depicts the schematic of the system according to an embodiment of the invention as disclosed herein. In an embodiment the genset (not shown) includes an engine (not shown) and an alternator 300. In an embodiment the engine (not shown) includes a coolant temperature sensor 202 and an exhaust gas recirculation valve 204. In an embodiment the system 100 includes a control unit 102.
[0016] In an embodiment, the alternator 300 is used for generating electricity. The alternator 300 is driven by the engine (not shown). In an embodiment the control unit 102 is provided in communication with the W terminal (not shown) of the alternator 300. The alternator 300 provides information about the speed of the alternator (not shown) to the control unit 102.
[0017] In an embodiment the coolant temperature sensor 202 is used for measuring the temperature of the coolant (not shown) used for cooling the engine (not shown). The coolant temperature sensor 202 is provided in communication with the control unit 102. The coolant temperature sensor 202 provides information about the temperature of the coolant (not shown) to the control unit 102.
[0018] In an embodiment the control unit 102 is used for controlling the exhaust gas recirculation valve 204. The control unit 102 is provided in communication with the exhaust gas recirculation valve 204. In an embodiment the control unit 102 receives information from the alternator 300 and the coolant temperature sensor 202. In an embodiment the control unit 102 is at least one of microcontroller, microprocessor or a programmable logic controller.
[0019] The working of the system 100 is as follows. During starting of the engine (not shown) or during transient loading or unloading of the engine (not shown) or when the engine is in overheated condition the exhaust gas recirculation valve 204 is closed for a predetermined amount of time by the control unit 102 to prevent the flow of exhaust gas into the engine (not shown), until the engine gets stabilized in terms of speed or temperature.
[0020] During starting of the engine (not shown) or during transient loading or unloading of the engine (not shown), the control unit 102 determines the rate of change of speed of the alternator from the information provided by the alternator 300 (as alternator speed is proportional to engine speed) and compares the detected value with a predetermined value of rate of change of speed of the alternator and closes the exhaust gas recirculation valve 204 for a predetermined amount of time to prevent the flow of exhaust gases into the engine if the detected value is greater than or equal to the predetermined value.
[0021] When the engine is in overheated condition, the control unit 102 determines the temperature of the coolant of the engine from the information provided by the coolant temperature sensor 202 (as coolant temperature is proportional to engine temperature) and compares the detected value with a predetermined value of temperature of the coolant of the engine and closes the exhaust gas recirculation valve 204 for a predetermined amount of time to prevent the flow of exhaust gases into the engine if the detected value is greater than or equal to the predetermined value.
[0022] FIG. 2 depicts the flow chart of the method according to an embodiment of the invention as disclosed herein. A method 400 for controlling an exhaust gas recirculation valve of an engine in a genset includes, providing a control unit configured to communicate with the exhaust gas recirculation valve, an alternator of the genset and a coolant temperature sensor of the engine to control the exhaust gas recirculation valve. The controlling of the exhaust gas recirculation valve includes, closing of the exhaust gas recirculation valve if a rate of change of speed of the alternator exceeds or equals a predetermined value of rate of change of speed of the alternator and/or if a temperature of a coolant of the engine exceeds or equals a predetermined value of temperature of the coolant of the engine.
[0023] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

CLAIMS
We claim
1. A system for controlling an exhaust gas recirculation valve of an engine in a genset, said system comprising:
a control unit configured to communicate with said exhaust gas recirculation valve, an alternator of said genset and a coolant temperature sensor of said engine to control said exhaust gas recirculation valve.
2. The system as claimed in claim 1, wherein said control unit is at least one of microcontroller, microprocessor and a programmable logic controller.
3. The system as claimed in claim 1, wherein said control unit is provided in communication with a W terminal of said alternator.
4. The system as claimed in claim 1, wherein said control unit is configured to close said exhaust gas recirculation valve if a rate of change of speed of said alternator exceeds or equals a predetermined value of rate of change of speed of said alternator.
5. The system as claimed in claim 1, wherein said control unit is configured to close said exhaust gas recirculation valve if a temperature of a coolant of said engine exceeds or equals a predetermined value of temperature of said coolant of said engine.
6. A method for controlling an exhaust gas recirculation valve of an engine in a genset, said method comprising:
providing a control unit configured to communicate with the exhaust gas recirculation valve, an alternator of the genset and a coolant temperature sensor of the engine to control the exhaust gas recirculation valve.
7. The method as claimed in claim 6, wherein controlling of the exhaust gas recirculation valve includes closing of the exhaust gas recirculation valve if a rate of change of speed of the alternator exceeds or equals a predetermined value of rate of change of speed of the alternator.
8. The method as claimed in claim 6, wherein controlling of the exhaust gas recirculation valve includes closing of the exhaust gas recirculation valve if a temperature of a coolant of the engine exceeds or equals a predetermined value of temperature of the coolant of the engine.

Dated this 24th November 2015

Signatures:
Name of the Signatory: Dr. Kalyan Chakravarthy

ABSTRACT
System and method for controlling egr valve in an engine of a genset includes, a control unit configured to communicate with the exhaust gas recirculation valve, an alternator of the genset and a coolant temperature sensor of the engine to control the exhaust gas recirculation valve.
Fig. 1

,CLAIMS:CLAIMS
We claim
1. A system for controlling an exhaust gas recirculation valve of an engine in a genset, said system comprising:
a control unit configured to communicate with said exhaust gas recirculation valve, an alternator of said genset and a coolant temperature sensor of said engine to control said exhaust gas recirculation valve.
2. The system as claimed in claim 1, wherein said control unit is at least one of microcontroller, microprocessor and a programmable logic controller.
3. The system as claimed in claim 1, wherein said control unit is provided in communication with a W terminal of said alternator.
4. The system as claimed in claim 1, wherein said control unit is configured to close said exhaust gas recirculation valve if a rate of change of speed of said alternator exceeds or equals a predetermined value of rate of change of speed of said alternator.
5. The system as claimed in claim 1, wherein said control unit is configured to close said exhaust gas recirculation valve if a temperature of a coolant of said engine exceeds or equals a predetermined value of temperature of said coolant of said engine.
6. A method for controlling an exhaust gas recirculation valve of an engine in a genset, said method comprising:
providing a control unit configured to communicate with the exhaust gas recirculation valve, an alternator of the genset and a coolant temperature sensor of the engine to control the exhaust gas recirculation valve.
7. The method as claimed in claim 6, wherein controlling of the exhaust gas recirculation valve includes closing of the exhaust gas recirculation valve if a rate of change of speed of the alternator exceeds or equals a predetermined value of rate of change of speed of the alternator.
8. The method as claimed in claim 6, wherein controlling of the exhaust gas recirculation valve includes closing of the exhaust gas recirculation valve if a temperature of a coolant of the engine exceeds or equals a predetermined value of temperature of the coolant of the engine.