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

“VENTURI TUBE BASED CLOSED CRANKCASE VENTILATION SYSTEM FOR REDUCING ENGINE CRANKCASE PRESSURE”

APPLICANT:

Name Nationality Address
Mahindra & Mahindra Limited Indian Mahindra & Mahindra Ltd.,
MRV, Mahindra World City (MWC),
Plot No. 41/1, Anjur Post, Chengalpattu,
Kanchipuram District – 603004 (TN) INDIA

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 closed crankcase ventilation systems for internal combustion engines and more particularly but not exclusively, to a closed crankcase ventilation system having a venturi tube for reducing engine crankcase pressure.

BACKGROUND
[002] Generally, a crankcase ventilation system is used for venting the blow-by gases occurring inside the crankcase to atmosphere and thereby results in reducing an engine crankcase pressure. The blow by gases vented to the atmosphere is undesirable. However, owing to stringent emission norms manufacturers have opted for closed crankcase ventilation systems. In closed crankcase ventilation systems (CCV), blow-by gases escaping from crankcase will carry oil into intake system, which increases emission as well as oil consumption level.
[003] Hence, in order to separate the oil from the blow-by gases, high efficiency oil separator is introduced in the closed crankcase ventilation system to separate the oil from the blow-by gases. However, the high efficiency oil separator increases the restriction to the flow of blow-by gases and results in increased engine crankcase pressure thereby leading to decreased engine efficiency.
[004] Therefore, there exists a need for a closed crankcase ventilation system that can reduce the engine crankcase pressure while achieving the emission norms. Further, there exists a need for a system that can eliminate the aforementioned drawbacks.

OBJECTS
[006] The principal object of an embodiment of this invention is to provide a system having a venturi tube for reducing an engine crankcase pressure.
[007] 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 preferred 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
[008] 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:
[009] Fig. 1 depicts a schematic of a system, according to an embodiment of the invention as disclosed herein; and
[0010] Fig. 2 depicts a front view of a venturi tube of the system, according to an embodiment of the invention as disclosed herein.

DETAILED DESCRIPTION
[0011] 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.
[0012] The embodiments herein achieve a system having a venturi tube for reducing an engine crankcase pressure. 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.
[0013] Fig. 1 depicts a schematic of a system 100, according to an embodiment of the invention as disclosed herein and Fig. 2 depicts a front view of a venturi tube 106 of the system 100, according to an embodiment of the invention as disclosed herein. The system 100 includes an engine 102, a filter 104, a venturi tube 106, a turbocharger 108 and an intercooler 110.
[0014] In an embodiment, the engine 102 is provided in fluid communication with the filter 104. However, it is also within the scope of the invention to provide the engine 102 in fluid communication with the venturi tube 106 to reduce a crankcase pressure of the engine 102 without otherwise deterring the intended function of the engine 102 and the venturi tube 106 as can be deduced from the description.
[0015] The filter 104 is used to separate oil from fluid received from the engine 102. In an embodiment, the filter 104 includes an inlet (not shown) and an outlet (not shown). In, an embodiment, the filter 104 is provided in fluid communication with the engine 102 via inlet (not shown) of the filter 104. The inlet (not shown) of the filter 104 is configured to receive fluid from the engine 102. In an embodiment, the outlet (not shown) of the filter 104 is configured to discharge fluid to the venturi tube 106.
[0016] In an embodiment, the venturi tube 106 includes a throat 106a, an inlet 106b and an outlet 106c. In an embodiment, the throat 106a of the venturi tube 106 defines an opening (not shown) provided therein to receive fluid from the outlet (not shown) of the filter 104. In an embodiment, the venturi tube 106 is used to reduce the crankcase pressure of the engine 102 by allowing fluid flow from the engine 102 to the filter 104, due to low pressure in throat 106a of the venturi tube 106. The opening (not shown) of the throat 106a of the venturi tube 106 is configured to receive an arm 106d therein. In an embodiment, the inlet 106b of the venturi tube 106 is configured to receive air from an air filter (not shown). In an embodiment, the outlet 106c of the venturi tube 106 is provided in fluid communication with the engine 102 via turbocharger 108.
[0017] The working of the system 100 is as follows. During the operation of the engine 102, blow by gases occurring inside the crankcase (not shown) of the engine 102 is vented to the filter 104. The filter 104 separates the oil from the blow by gases and returns oil back to the crankcase (not shown) of the engine 102. The outlet (not shown) of the filter 104 discharges oil free blow by gases to the throat 106a of the venturi tube 106. The venturi tube 106 reduces the crankcase pressure of the engine 102 by allowing blow by gas flow from the engine 102 to the filter 104, due to low pressure developed in throat 106a of the venturi tube 106 i.e., the venturi tube 106 works on the principle of venturi effect such that a reduction in fluid pressure is achieved as and when the fluid flows through the constricted section of the venturi tube 106.

Speed Crankcase pressure (mbar)
RPM Base With Venturi tube
2100 28.5 10.5
2000 28 10.5
1900 28 9
1800 28 8.5
1700 28 6.5
1600 28 6.5
1500 29 7.5
1400 29.5 9.5
1300 30 9.5
1200 30 10

[0018] The aforementioned table shows the values of the crankcase pressure of the engine 102 of the system 100. As can be deduced from the table, it is clearly evident that the crankcase pressure of the engine 100 is lower than the predetermined values of the standard system.
[0019] 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.

CLAIMS
We claim,
1. A system for reducing a crankcase pressure of an engine, said system comprising:
a venturi tube having a throat, an inlet and an outlet, wherein said throat defines an opening; and
a filter having an inlet and an outlet, said filter being in fluid communication with said engine via said inlet of said filter, said outlet of said filter is adapted to discharge fluid to said throat of said venturi tube via said opening of said throat of said venturi tube,
wherein
said venturi tube is adapted to reduce said crankcase pressure of said engine by allowing fluid flow from said engine to said filter; and
said filter is adapted to separate oil from fluid received from said engine.
2. The system as claimed in claim 1, further comprising a turbocharger.
3. The system as claimed in claim 1, further comprising an intercooler.
4. The system as claimed in claim 1, wherein said inlet of said venturi tube is configured to receive air from an air filter.
5. The system as claimed in claim 1, wherein said outlet of said venturi tube is provided in fluid communication with said engine via a turbocharger.
6. A system for reducing a crankcase pressure of an engine, said system comprising:
a venturi tube having a throat defining an opening, an inlet and an outlet, said venturi tube is provided in fluid communication with said engine via said opening of said throat of said venturi tube,
wherein
said venturi tube is adapted to reduce said crankcase pressure of said engine by allowing fluid flow from said engine to said venturi tube.
7. The system as claimed in claim 6, further comprising a turbocharger.
8. The system as claimed in claim 6, further comprising an intercooler.
9. The system as claimed in claim 6, wherein said inlet of said venturi tube is configured to receive air from an air filter.
10. The system as claimed in claim 6, wherein said outlet of said venturi tube is provided in fluid communication with said engine via a turbocharger.

Date: January 29th, 2016 Signature:
Dr..Kalyan Chakravarthy

ABSTRACT
Venturi tube based closed crankcase ventilation system for reducing engine crankcase pressure includes an engine, a filter, a venturi tube, a turbocharger and an intercooler. The venturi tube is used to reduce engine crankcase pressure by allowing flow of blow by gases from the engine to the filter, due to low pressure in a throat of the venturi tube.
Fig. 1

,CLAIMS:CLAIMS
We claim,
1. A system for reducing a crankcase pressure of an engine, said system comprising:
a venturi tube having a throat, an inlet and an outlet, wherein said throat defines an opening; and
a filter having an inlet and an outlet, said filter being in fluid communication with said engine via said inlet of said filter, said outlet of said filter is adapted to discharge fluid to said throat of said venturi tube via said opening of said throat of said venturi tube,
wherein
said venturi tube is adapted to reduce said crankcase pressure of said engine by allowing fluid flow from said engine to said filter; and
said filter is adapted to separate oil from fluid received from said engine.
2. The system as claimed in claim 1, further comprising a turbocharger.
3. The system as claimed in claim 1, further comprising an intercooler.
4. The system as claimed in claim 1, wherein said inlet of said venturi tube is configured to receive air from an air filter.
5. The system as claimed in claim 1, wherein said outlet of said venturi tube is provided in fluid communication with said engine via a turbocharger.
6. A system for reducing a crankcase pressure of an engine, said system comprising:
a venturi tube having a throat defining an opening, an inlet and an outlet, said venturi tube is provided in fluid communication with said engine via said opening of said throat of said venturi tube,
wherein
said venturi tube is adapted to reduce said crankcase pressure of said engine by allowing fluid flow from said engine to said venturi tube.
7. The system as claimed in claim 6, further comprising a turbocharger.
8. The system as claimed in claim 6, further comprising an intercooler.
9. The system as claimed in claim 6, wherein said inlet of said venturi tube is configured to receive air from an air filter.
10. The system as claimed in claim 6, wherein said outlet of said venturi tube is provided in fluid communication with said engine via a turbocharger.