DESC:FORM 2

THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENT RULES, 2003

COMPLETE SPECIFICATION
(See Section 10 and Rule 13)

Title of invention:
TWIN AIR FILTER SYSTEM FOR HEAVY DUTY VEHICLE ENGINE

Applicant:
BEML Limited
A company Incorporated in India under the Companies Act, 1956
Having address:
BEML Soudha, 23/1, 4th Main,
Sampangirama Nagar, Bengaluru - 560 027,
Karnataka, India

The following specification particularly describes the invention and the manner in which it is to be performed

CROSS-REFERENCE TO RELATED APPLICATIONS AND PRIORITY
[001] The present invention claims priority from Indian patent application numbered IN 202041009142 filed on 03 March 2020.

TECHNICAL FIELD
[002] The present subject matter described herein, in general, relates to air filter system. More specifically, the present subject matter relates to the twin air filter system for a heavy duty vehicle engine.

BACKGROUND OF THE INVENTION
[003] The hydraulic excavator is the heavy duty vehicle operating for a long duration in heavy dusty environment. Generally, increasing air filtration capacity reduces the exhaust temperature, thereby reducing overall operating temperature. Due to global warming ambient temperature is increased by 5-6 ºC and the existing design of filters are not suited to the current ambient temperature. The existing system makes use of a single air filter per turbocharger to filter air. In some heavy-duty vehicle engines the two air filters are used as there are two turbochargers.
[004] Now referring to figure 1, (prior art) the conventional air filter system (100) for the heavy duty vehicle engine is disclosed. The conventional air filter system (100) for the heavy duty vehicle engine comprises a turbo pre-cleaner (110), an air filter (120), a turbocharger (130), an intercooler (140), an engine intake manifold (150) and an engine combustion chamber (160). The conventional air filter system (100) uses the single air filter (120)for the turbocharger (130).The turbo pre-cleaner (110) is connected to the air filter (120)with the pipes through the hoses and separates dust, dirt, suspended particles from the ambient air. The air filter (120) cleans micro particles from the precleaned air received from the turbo pre-cleaner (110). The outlet of the air filter (120) transfers clean air to the inlet of the compressor housing part of the turbocharger (130) through the pipe. To get more air into the engine combustion chamber (160), a turbocharger system (130) starts with engine exhaust gases. The exhaust gases from outlet of engine combustion chamber (160) drives the turbine wheel of the turbocharger (130) through the pipes. In the turbocharger (130), the compressor wheel is attached at one end and the turbine wheel attached at other end of forged steel shaft of the turbocharger (130). This two wheels turns together and rapid spinning allows the compressor to suck the ambient air from the air filter (120). In the turbocharger (130), due to compression, air temperature increases. This compressed air then transfers to an intercooler (charge air cooler or aftercooler) (140) that reduces air temperature and increase the density of air. The cool air from an intercooler (charge air cooler or aftercooler) (140) then transfers to the engine combustion chamber (160) through the engine intake manifold (150) and allowing an engine to burn fuel to produce the power.
[005] With the increased ambient temperature, the engine operating temperature increases and mass flow rate of air (density of air) decreases. Hence, there is a need to devise the twin air filter system that increases the mass flow rate of air and reduce the overall engine operating temperature and thereby enhancing engine durability and life.

OBJECTS OF THE INVENTION
[006] Main object of the present invention is to lower engine operating temperature and improve engine reliability by increasing the air filtration capacity.
[007] Another object of the present invention is to improve air flow rate and improves specific fuel consumption.
[008] Another object of the present invention is to lower intake air depression.

SUMMARY OF THE INVENTION
[009] Before the present system is described, it is to be understood that this application is not limited to the particular machine or an apparatus, and methodologies described, as there can be multiple possible embodiments that are not expressly illustrated in the present disclosures. It is also to be understood that the terminology used in the description is for the purpose of describing the particular versions or embodiments only and is not intended to limit the scope of the present application. This summary is provided to introduce aspects related to the twin air filter system for heavy duty vehicle engine, and the aspects are further elaborated below in the detailed description. This summary is not intended to identify essential features of the proposed subject matter nor is it intended for use in determining or limiting the scope of the proposed subject matter.
[010] The present invention discloses the twin air filter system for the heavy-duty vehicle engine. The heavy-duty vehicle engine is configured with the two air filter on account of the single turbocharger that aids in reducing pressure drop and increase the mass flow rate of the ambient air in the system. Due to increased mass flow rate of ambient air, the temperature of air reduces below the air temperature in the intercooler and this will eliminate the use of intercooler that cools the air in the system. As incoming air temperature to combustion chamber is reduced, thereby allowing excess air ratio even at lower engine speeds. Thus, the engine always runs with higher excess air ratio. Due to which the engine operating temperature is also reduced (lower the engine air intake temperature, lower will be the exhaust gas temperature), resulting in improved engine reliability.

BRIEF DESCRIPTION OF THE DRAWINGS
[011] The foregoing summary, as well as the following detailed description of embodiments, is better understood when read in conjunction with the appended drawing. For the purpose of illustrating the disclosure, there is shown in the present document example constructions of the disclosure, however, the disclosure is not limited to the specific methods and apparatus disclosed in the document and the drawing:
[012] The detailed description is described with reference to the accompanying figure. In the figure, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the drawing to refer like features and components.
[013] Figure 1 illustrates the conventional air filter system for the heavy-duty vehicle engine. (Prior art)
[014] Figure 2 illustrates the twin air filter system for the heavy-duty vehicle engine, in accordance with one embodiment of the present subject matter.
[015] The figure depicts various embodiments of the present disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following discussion that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION OF THE INVENTION
[016] Some embodiments of this disclosure, illustrating all its features, will now be discussed in detail. The words "comprising", “having”, and "including," and other forms thereof, are intended to be equivalent in meaning and be open ended in that an item or items following any one of these words is not meant to be an exhaustive listing of such item or items, or meant to be limited to only the listed item or items. Although any systems and methods similar or equivalent to those described herein can be used in the practice or testing of embodiments of the present disclosure, the exemplary, systems and methods are now described. The disclosed embodiments are merely exemplary of the disclosure, which may be embodied in various forms.
[017] Various modifications to the embodiment will be readily apparent to those skilled in the art and the generic principles herein may be applied to other embodiments. However, one of ordinary skill in the art will readily recognize that the present disclosure is not intended to be limited to the embodiments illustrated but is to be accorded the widest scope consistent with the principles and features described herein.
[018] Referring now to figure 2, in accordance with one embodiment of the present subject matter, the twin air filter system (200) for the heavy duty vehicle engine is disclosed. The proposed twin air filter system(200) comprises two turbo pre-cleaners (110) (112), two air filters (120) (122), a turbocharger (130),an engine intake manifold (150),engine combustion chamber (160), hoses, clamps, piping, a connector and gaskets. The twin air filter system (200)is configured with two air filters (120) (122)on account of the single turbocharger (130).The present invention aids in reducing pressure drop and increase the mass flow rate of air.
[019] The two turbo pre-cleaners (110) (112) are configured to receive the dirty ambient air through the protective screen that repels stones, large debris and suspended particles from air. The carefully angled, compound vanes of the turbo pre-cleaners (110) (112) spins the incoming air causing centrifugal force to separate the dust and dirt from ambient air. The two turbo pre-cleaners (110) (112) are configured to connect with respective two air filters (120) (122) with the pipes through the hoses. The use of turbo pre-cleaners (110) (112) increases air filter life. All fuel burning engine require a constant supply of air in order to function properly. Air filters (120) (122) improves the quality and quantity of clean ambient air requires for engine and this improves engine performance and efficiency.
[020] A turbocharger (130) is a component composed of a shaft with a turbine wheel on one end and a compressor wheel on the other. This assembly is covered bya snail shaped housing. The turbine consists of the turbine wheel and turbine housing. The turbine housing guides the engine exhaust gases into turbine wheel. The energy from exhaust gas drive the turbine wheel and the gas then exits the turbine housing through an exhaust outlet area. The compressor also consists of compressor wheel and compressor housing. The compressor’s mode of action is opposite to that of the turbine. As the turbine rotates, the compressor wheel also rotates, and the high velocity spinning action of the compressor draws air inside the compressor housing and compresses it. The compressor housing then converts high velocity, low pressure air stream into high pressure and low velocity air stream through a process called diffusion. This compressed air is then pushed into the engine combustion chamber (160) through engine intake manifold (150).
[021] The two turbo pre-cleaners (110) (112) are configured to connect with two respective air filters (120) (122) with the pipes through the hoses and separates dust, dirt, suspended particles from the ambient air. The two air filters (120) (122) are configured to clean micro particles from the precleaned air received from the respective turbo pre-cleaners (110) (112).The outlets of two air filters(120) (122) are configured to transfer clean air to the inlet of the compressor housing part of the turbocharger (130) through the single pipe. To get more air into the engine combustion chamber (160), a turbocharger system(130) starts with engine exhaust gases. The exhaust gases from outlet of engine combustion chamber (160) drives the turbine wheel of the turbocharger (130) through the pipes. In the turbocharger (130), the compressor wheel is attached at one end and the turbine wheel attached at other end of forged steel shaft of the turbocharger (130). These two wheels turns together and rapid spinning allows the compressor to suck the large amount of ambient air from the two air filters (120) (122). Here, single turbocharger (130) is configured to deliver large amount of highly dense and cool air to the engine combustion chamber (160) by compressing clean air from the two air filters (120) (122). This will result in highly dense air quality and thus the temperature of air reduces in the engine intake manifold (150). Due to the use of the two air filters (120) (122) and the single turbocharger (130) the operating temperature of air reduces below the intercooler air temperature and this will eliminate the use of intercooler that cools the air in the system. The compressed cool air from the turbocharger (130) with increased mass flow rate is then pushed into the engine combustion chamber (160) through the engine intake manifold (150) and allowing engine to burn more fuel to produce more power.
[022] As the mass flow rate of air is increased due to the use of the two air filters (120) (122), this highly dense air reduces the air temperature from the single turbocharger (130). Thus, incoming air temperature to the combustion chamber of engine (160) is reduced, and thereby allowing excess air ratio even at lower engine speeds. Thus, the engine always runs with higher excess air ratio. Due to which engine operating temperature is reduced, resulting in improved engine reliability. The present invention lowers the intake air depression and restriction values, increases air flow rate, better SFC (specific fuel consumption) and lowers engine operating temperature (as exhaust temperature decreased due to excess air ratio).
[023] REFERRAL NUMERALS:
Element Description Reference Numeral
Conventional air filter system (Prior art) 100
Proposed twin air filter system 200
Turbo Pre-cleaner-1 110
Turbo Pre-cleaner-2 112
Air Filter-1 120
Air Filter-2 122
Turbocharger 130
Intercooler (charge air cooler or aftercooler ) 140
Engine Intake Manifold 150
Engine Combustion Chamber 160

,CLAIMS:
1. A twin air filter system (200) for a heavy duty vehicle engine comprising:
at least two turbo pre-cleaners (110) (112) configured to remove the suspended particles from ambient air;
at least two air filters (120) (122) configured to clean micro particles from the precleaned air received from the respective turbo pre-cleaners (110) (112);
a turbocharger (130) configured to compress clean ambient air received from the two air filters (120) (122) through a single pipe and increases density of compressed air; and
an engine intake manifold (150) configured to receive dense and cool air from the turbocharger (130) and to transfer the cool air in an engine combustion chamber (160).

2. The twin air filter system (200) for the heavy duty vehicle engine as claimed in claim 1, wherein the two air filters (120) (122) are configured to increase mass flow rate of ambient air to said turbocharger (130) to reduce temperature of compressed air.

3. The twin air filter system (200) for the heavy duty vehicle engine as claimed in claim 1, wherein the air supply through the two turbo pre-cleaners (110) (112), the two air filters (120) (122) and the turbocharger (130) are configured to provide cool compressed air charge from the turbocharger (130).