FORM – 2
THE PATENTS ACT, 1970
(39 of 1970)
&
THE PATENTS RULES, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)
MICRO LUBRICATION SYSTEM FOR HYDROGEN INTERNAL COMBUSTION
ENGINE INJECTORS
Applicant(s):
VE COMMERCIAL VEHICLES LTD
102, INDUSTRIAL AREA 1, PITHAMPUR- 454775, DIST. DHAR, MP, INDIA
Inventors:
(1) Anup Kundu
(2) Saurav Roy
(3) P Kumar
The following specification particularly describes the invention and the manner in which it
is to be performed.
2
MICRO LUBRICATION SYSTEM FOR HYDROGEN INTERNAL
COMBUSTION ENGINE INJECTORS
FIELD OF THE DISCLOSURE
[0001] This invention generally relates to a field of a lubrication system for
vehicles, and in particular, to a micro lubrication system for hydrogen internal5
combustion engine injectors and method thereof.
BACKGROUND
[0002] The subject matter discussed in the background section should not be
assumed to be prior art merely as a result of its mention in the background section.
Similarly, a problem mentioned in the background section or associated with the10
subject matter of the background section should not be assumed to have been
previously recognized in the prior art. The subject matter in the background section
merely represents different approaches, which in and of themselves may also
correspond to implementations of the claimed technology.
[0003] Hydrogen internal combustion engines are increasingly being explored as an15
alternative propulsion technology due to their potential for reducing carbon-based
emissions while utilizing existing internal combustion engine architectures. In such
engines, hydrogen fuel is supplied to combustion chambers through dedicated
hydrogen injectors operating under high-pressure and high-frequency conditions.
[0004] Unlike conventional liquid hydrocarbon fuels, hydrogen is a dry and highly20
reactive fuel that lacks inherent lubricating properties. As a result, moving
components within hydrogen internal combustion engine injectors, such as needle
valves, sealing elements, and guiding surfaces, are exposed to increased friction
during repeated actuation cycles.
[0005] In hydrogen injector assemblies, the absence of sufficient lubrication leads25
to accelerated wear of internal components. Continuous high-pressure operation
combined with the dry nature of hydrogen fuel exacerbates mechanical contact
between mating parts, thereby shortening injector service life and increasing the
likelihood of premature failure.
3
[0006] Increased friction within injector mechanisms adversely affects injector
responsiveness, opening and closing precision, and overall fuel delivery accuracy.
Such friction-related degradation can negatively impact engine efficiency,
combustion stability, and emission performance, particularly in hydrogen internal
combustion engines operating under varying load and speed conditions.5
[0007] Additionally, hydrogen fuel environments may promote the accumulation of
contaminants or deposits within injector components over extended periods of
operation. These deposits can interfere with injector needle movement and spray
characteristics, leading to inconsistent fuel atomization and reduced combustion
efficiency.10
[0008] Hydrogen internal combustion engine injectors are also subjected to
significant thermal stresses, especially during high-load or high-performance
operating conditions. Elevated temperatures, when combined with increased friction
and inadequate lubrication, can contribute to thermal degradation of injector
components and sealing interfaces.15
[0009] Thermal build-up and friction-induced wear collectively reduce injector
durability and reliability, increasing maintenance requirements and operational
costs. These challenges are particularly pronounced in hydrogen engines due to the
demanding operating environment and the sensitivity of injector performance to
mechanical and thermal variations.20
[0010] Another the patent application, “US20250263625A1,” titled “Lubricant
composition and use thereof for improving pre-ignition in hydrogen internal
combustion engine,” describes A method for mitigating preignition events in a
hydrogen internal combustion engine. The method includes providing a dosing
system in fluid communication with a dosing cylinder of a cylinder block of the25
hydrogen internal combustion engine; introducing a lubricant including a base oil,
a polymer, or mixtures thereof to an intake area of the dosing cylinder via the dosing
system; and initiating operating conditions for the hydrogen internal combustion
engine.
[0011] Another patent application, "CN222121654U," titled "Anti-backfire30
protection device for ejector of hydrogen internal combustion engine," describes an
4
anti-backfire protection device for an ejector of a hydrogen internal combustion
engine, belongs to the technical field of hydrogen engines, and solves the problems
that the ejector is damaged and the service life of the engine is influenced due to
backfire generated by the hydrogen internal combustion engine. The protection
device comprises a hydrogen inlet pipeline installed at the bottom of an intake5
manifold, the hydrogen inlet pipeline is arranged at the bottom of the intake
manifold, the hydrogen inlet pipeline is provided with a first pipe cavity, a second
pipe cavity and a third pipe cavity which are communicated in sequence, the first
pipe cavity is connected with a common rail pipe, one end of the common rail pipe
is connected with an ejector, and the other end of the common rail pipe is connected10
with an ejector. An anti-backfire structure is arranged in the third pipe cavity and
comprises a one-way valve and a metal net, and the one-way valve and the metal
net are sequentially installed in the third pipe cavity in the hydrogen gas flow
direction. According to the anti-backfire protection device for the ejector of the
hydrogen internal combustion engine, the ejector is prevented from being damaged15
by high-temperature and high-pressure gas generated by backfire.
[0012] In conventional hydrogen internal combustion engine fuel injection systems,
injector operation is typically performed in an environment lacking inherent fuel
lubricity, with moving injector components such as needle valves and sealing
interfaces operating under high pressure and high actuation frequencies. However,20
such operating conditions present several limitations in ensuring long-term injector
reliability and consistent fuel delivery performance. In particular, existing hydrogen
injector designs are ineffective at mitigating friction-induced wear and thermal
stress over prolonged usage due to the dry and highly reactive nature of hydrogen
fuel. Additionally, sustained high-pressure operation and repeated mechanical25
contact between injector components can lead to accelerated wear, deposit
accumulation, and degradation of sealing performance, which are often detected
only after injector efficiency declines or malfunction occurs. As a result,
conventional hydrogen injector architectures are prone to reduced durability,
inconsistent atomization, increased maintenance requirements, and diminished30
5
operational reliability, especially in high-load or extended-duty hydrogen engine
application.
OBJECTIVES OF THE INVENTION
[0013] The objective of the present invention is to provide a micro lubrication
system for hydrogen internal combustion engine injectors to enhance durability and5
long-term reliability of injector operation.
[0014] The objective of the present invention is to mitigate accelerated wear of
hydrogen internal combustion engine injectors caused by the dry nature of hydrogen
fuel and high-pressure operating conditions.
[0015] The objective of the present invention is to provide a controlled lubrication10
architecture that supplies a precise and predefined amount of lubrication solution to
hydrogen internal combustion engine injectors.
[0016] The objective of the present invention is to manage lubrication flow
electronically using micro dozers, thereby enabling accurate and repeatable control
of lubrication delivery to each injector.15
[0017] The objective of the present invention is to provide a micro lubrication
system in which each injector receives an individually metered quantity of
lubrication solution through a respective micro dozer.
[0018] The objective of the present invention is to simplify system packaging by
integrating micro dozers directly with a delivery rail and positioning the plurality of20
micro dozers in close proximity to the hydrogen internal combustion engine
injectors.
[0019] The objective of the present invention is to reduce system complexity by
delivering lubrication solution directly to the injectors without requiring
intermediate lubrication distribution components.25
[0020] The objective of the present invention is to enhance operational reliability
of hydrogen internal combustion engine injectors by ensuring consistent lubrication
under varying engine operating conditions.
[0021] The objective of the present invention is to provide a compact, scalable, and
manufacturable micro lubrication system suitable for integration with hydrogen30
internal combustion engines.
6
[0022] The objective of the present invention is to improve injector service life and
reduce maintenance requirements in hydrogen internal combustion engine
applications through precise and controlled micro lubrication.
SUMMARY
[0023] The present invention relates to a micro lubrication system for hydrogen5
internal combustion engine injectors.
[0024] According to an aspect, a micro lubrication system for hydrogen internal
combustion engine injectors is disclosed. The micro lubrication system for hydrogen
internal combustion engine injectors comprises at least one delivery rail configured
to be operatively coupled to a plurality of hydrogen internal combustion engine10
injectors. The micro lubrication system further comprises a plurality of micro
dozers, each micro dozer being associated with a respective hydrogen internal
combustion engine injector, the plurality of micro dozers being fluidically coupled
to the at least one delivery rail and configured to deliver a predefined amount of
lubrication solution to the plurality of hydrogen internal combustion engine15
injectors. The micro lubrication system further comprises an oil delivery module
fluidically coupled to the at least one delivery rail via a supply line and configured
to deliver the lubrication solution to the at least one delivery rail. Further, the oil
delivery module comprises an electric pump configured to deliver a steady and
controlled flow of the lubrication solution to the at least one delivery rail. The micro20
lubrication system further comprises a microcontroller communicatively coupled to
the oil delivery module and the plurality of micro dozers. Further, the
microcontroller is configured to regulate a predefined pressure in the plurality of
micro dozers to atomize the lubrication solution, forming a thin lubricating film over
moving parts of the plurality of hydrogen internal combustion engine injectors. The25
micro lubrication system further comprises a control line fluidically coupled to the
plurality of micro dozers and configured to convey the predefined pressure to the
plurality of micro dozers.
[0025] According to another aspect, a method for operating a micro lubrication
system for hydrogen internal combustion engine injectors is disclosed. The method30
comprises steps of coupling at least one delivery rail operatively to a plurality of
7
hydrogen internal combustion engine injectors. The method further comprises steps
of fluidically coupling a plurality of micro dozers, each micro dozer being
associated with a respective hydrogen internal combustion engine injector, to the at
least one delivery rail and the plurality of micro dozers being configured to deliver
a predefined amount of lubrication solution to the plurality of hydrogen internal5
combustion engine injectors. The method further comprises steps of fluidically
coupling an oil delivery module to the at least one delivery rail via a supply line and
the oil delivery module being configured to deliver the lubrication solution to the at
least one delivery rail. Further, the oil delivery module comprises an electric pump
configured to deliver a steady and controlled flow of the lubrication solution to the10
at least one delivery rail. The method further comprises steps of regulating, via a
microcontroller communicatively coupled to the oil delivery module and the
plurality of micro dozers, a predefined pressure in the plurality of micro dozers to
atomize the lubrication solution, forming a thin lubricating film over moving parts
of the plurality of hydrogen internal combustion engine injectors. The method15
further comprises steps of fluidically coupling a control line to the plurality of micro
dozers and the control line being configured to convey the predefined pressure to
the plurality of micro dozers.
BRIEF DESCRIPTION OF THE DRAWINGS
[0026] The accompanying drawings illustrate various embodiments of systems,20
methods, and embodiments of various other aspects of the disclosure. Any person
with ordinary skills in the art will appreciate that the illustrated element boundaries
(e.g., boxes, groups of boxes, or other shapes) in the figures represent one example
of the boundaries. It may be that in some examples one element may be designed as
multiple elements or that multiple elements may be designed as one element. In25
some examples, an element shown as an internal component of one element may be
implemented as an external component in another, and vice versa. Furthermore,
elements may not be drawn to scale. Non-limiting and non-exhaustive descriptions
are described with reference to the following drawings. The components in the
figures are not necessarily to scale, emphasis instead being placed upon illustrating30
principles.
8
[0027] FIG. 1 illustrates an isometric view of a micro lubrication system for
hydrogen internal combustion engine injectors, according to an embodiment of the
present disclosure;
[0028] FIG. 2 illustrates a side view of the micro lubrication system, according to
an embodiment of the present disclosure;5
[0029] FIG. 3 illustrates an isometric view of the micro lubrication system,
according to an embodiment of the present disclosure; and
[0030] FIG. 4 illustrates a flowchart showing a method for operating a micro
lubrication system for hydrogen internal combustion engine injectors, according to
an embodiment of the present disclosure.10
DETAILED DESCRIPTION
[0031] Some embodiments of this disclosure, illustrating all its features, will now
be discussed in detail. The words “comprising,” “having,” “containing,” 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 meant15
to be an exhaustive listing of such item or items or meant to be limited to only the
listed item or items. It must also be noted that as used herein and in the appended
claims, the singular forms “a,” “an,” and “the” include plural references unless the
context clearly dictates otherwise.
[0032] Although any systems and methods similar or equivalent to those described20
herein can be used in the practice or testing of embodiments of the present
disclosure, the preferred, systems and methods are now described. Embodiments of
the present disclosure will be described more fully hereinafter with reference to the
accompanying drawings in which like numerals represent like elements throughout
the several figures, and in which example embodiments are shown. Embodiments25
of the claims may, however, be embodied in many different forms and should not
be construed as limited to the embodiments set forth herein. The examples set forth
herein are non-limiting examples and are merely examples among other possible
examples.
[0033] The present invention discloses various embodiments of a micro lubrication30
system for hydrogen internal combustion engine injectors. Embodiments of the
9
present invention comprises at least one delivery rail configured to be operatively
coupled to a plurality of hydrogen internal combustion engine injectors.
Embodiments of the present invention further comprises a plurality of micro dozers,
each micro dozer being associated with a respective hydrogen internal combustion
engine injector, the plurality of micro dozers being fluidically coupled to the at least5
one delivery rail and configured to deliver a predefined amount of lubrication
solution to the plurality of hydrogen internal combustion engine injectors.
Embodiments of the present invention further comprises an oil delivery module
fluidically coupled to the at least one delivery rail via a supply line and configured
to deliver the lubrication solution to the at least one delivery rail. Further, the oil10
delivery module comprises an electric pump configured to deliver a steady and
controlled flow of the lubrication solution to the at least one delivery rail.
Embodiments of the present invention further comprises a microcontroller
communicatively coupled to the oil delivery module and the plurality of micro
dozers. Further, the microcontroller is configured to regulate a predefined pressure15
in the plurality of micro dozers to atomize the lubrication solution, forming a thin
lubricating film over moving parts of the plurality of hydrogen internal combustion
engine injectors. Embodiments of the present invention further comprises a control
line fluidically coupled to the plurality of micro dozers and configured to convey
the predefined pressure to the plurality of micro dozers.20
[0034] FIG. 1 illustrates an isometric view of a micro lubrication system (100) for
hydrogen internal combustion engine injectors (102), according to an embodiment
of the present disclosure. FIG. 2 illustrates a side view of the micro lubrication
system (100), according to an embodiment of the present disclosure. FIG. 3
illustrates an isometric view of the micro lubrication system (100), according to an25
embodiment of the present disclosure.
[0035] In some embodiments, the micro lubrication system (100) comprises at least
one delivery rail (104) configured to be operatively coupled to a plurality of
hydrogen internal combustion engine injectors (102). The micro lubrication system
(100) is configured to supply a lubrication solution to moving components of the30
hydrogen internal combustion engine injectors (102) during engine operation. The
10
lubrication solution is delivered in a controlled and predefined manner to mitigate
friction and wear associated with high-pressure hydrogen injection. The micro
lubrication system (100) is designed to operate independently of hydrogen fuel
delivery while remaining coordinated with overall engine operation. The system
enables precise lubrication of injector components without adversely affecting5
hydrogen fuel atomization or combustion characteristics. The architecture of the
micro lubrication system (100) allows integration with existing hydrogen internal
combustion engine layouts. The system is particularly suited for engines operating
under high load, high pressure, or extended duty cycles. The micro lubrication
system (100) enhances injector durability and operational reliability over prolonged10
usage.
[0036] The at least one delivery rail (104) is configured to distribute the lubrication
solution to a plurality of micro dozers (106). The at least one delivery rail (104) is
fluidically coupled to the oil delivery module (108) via a supply line (112) and is
configured to receive a steady and controlled flow of the lubrication solution. In15
some embodiments, the at least one delivery rail (104) extends along a plurality of
hydrogen internal combustion engine injectors (102) such that lubrication solution
may be supplied in proximity to each injector. The at least one delivery rail (104)
serves as a common distribution conduit for the lubrication solution while
maintaining pressure stability along its length. The at least one delivery rail (104) is20
configured to withstand operating pressures associated with micro lubrication
delivery. The arrangement of the at least one delivery rail (104) enables compact
packaging and reduces routing complexity. The at least one delivery rail (104) may
be mounted adjacent to or integrated with an injector mounting structure of the
hydrogen internal combustion engine. The at least one delivery rail (104) facilitates25
equalized lubrication supply to multiple injectors. The at least one delivery rail (104)
contributes to uniform lubrication delivery across the injector array.
[0037] The plurality of micro dozers (106) are fluidically coupled to the at least one
delivery rail (104), with each micro dozer being associated with a respective
hydrogen internal combustion engine injector. Each micro dozer is configured to30
deliver a predefined amount of lubrication solution directly to the associated
11
injector. The plurality of micro dozers (106) meter the lubrication solution
independently, thereby enabling injector-specific lubrication control. In some
embodiments, the plurality of micro dozers (106) are positioned directly on or
adjacent to the at least one delivery rail (104) to minimize flow path length. The
plurality of micro dozers (106) are configured to deliver lubrication solution to5
moving components of the injectors including needle valves and sealing elements.
The plurality of micro dozers (106) operate under a predefined pressure to ensure
fine atomization of the lubrication solution. The independent operation of the
plurality of micro dozers (106) enables compensation for injector-to-injector
variation. The plurality of micro dozers (106) supports precise and repeatable10
lubrication delivery. The plurality of micro dozers (106) contributes to consistent
injector performance across the engine.
[0038] The oil delivery module (108) is fluidically coupled to the at least one
delivery rail (104) via the supply line (112) and is configured to deliver the
lubrication solution to the at least one delivery rail (104). The oil delivery module15
(108) comprises an electric pump configured to generate a steady and controlled
flow of the lubrication solution. The electric pump operates to maintain continuous
lubrication supply during engine operation. In some embodiments, the oil delivery
module (108) is configured as a dedicated lubrication module separate from a
hydrogen fuel supply system of the hydrogen internal combustion engine. This20
separation prevents contamination and functional interference between lubrication
and fuel delivery systems. The oil delivery module (108) may be mounted remotely
from the injectors while remaining fluidically connected through the supply line
(112). The oil delivery module (108) is configured to operate across a range of
engine speeds and loads. The electric pump enables precise control of lubrication25
flow rate. The oil delivery module (108) supports long-term lubrication stability.
[0039] The supply line (112) extends between the oil delivery module (108) and the
at least one delivery rail (104) and is configured to convey the lubrication solution
during operation of the hydrogen internal combustion engine. In some
embodiments, the supply line (112) is configured to continuously deliver the30
lubrication solution during engine operation. The supply line (112) is dimensioned
12
to maintain stable flow characteristics while minimizing pressure losses. The supply
line (112) may be routed to accommodate engine packaging constraints. The supply
line (112) is configured to withstand temperature variations encountered during
engine operation. The continuous delivery of lubrication solution ensures consistent
availability at the at least one delivery rail (104). The supply line (112) supports5
steady-state and transient lubrication demands. The configuration of the supply line
(112) contributes to overall system robustness. The supply line (112) enables
uninterrupted lubrication under varying operating conditions.
[0040] The micro lubrication system (100) further comprises a microcontroller
(110) communicatively coupled to the oil delivery module (108) and the plurality10
of micro dozers (106). The microcontroller (110) is configured to regulate a
predefined pressure in the plurality of micro dozers (106). The microcontroller (110)
controls operation of the electric pump and associated control elements to establish
the predefined pressure. In some embodiments, the microcontroller (110) regulates
the predefined pressure based on operating conditions of the hydrogen internal15
combustion engine. Such operating conditions may include engine speed, load,
temperature, or injector actuation frequency. The microcontroller (110) enables
adaptive lubrication control to suit dynamic engine conditions. The microcontroller
(110) ensures that lubrication delivery remains within predefined operating limits.
The microcontroller (110) contributes to precise pressure regulation for atomization.20
The microcontroller (110) enhances reliability of lubrication delivery.
[0041] A control line (114) is fluidically coupled to the plurality of micro dozers
(106) and is configured to convey the predefined pressure to the plurality of micro
dozers (106). The control line (114) serves as a pressure transmission path between
the pressure-regulating elements and the plurality of micro dozers (106). The control25
line (114) is configured to maintain the predefined pressure within the plurality of
micro dozers (106) to prevent over-lubrication and under-lubrication. The control
line (114) ensures that pressure variations are minimized across the plurality of
micro dozers (106). The control line (114) supports consistent atomization of the
lubrication solution. In some embodiments, the control line (114) extends along the30
at least one delivery rail (104) to supply pressure uniformly. The control line (114)
13
contributes to stable lubrication delivery during transient engine operation. The
control line (114) enhances repeatability of micro dozer operation. The control line
(114) supports coordinated pressure control across multiple injectors.
[0042] In operation, the predefined pressure regulated within the plurality of micro
dozers (106) causes the lubrication solution to be atomized as it is delivered to the5
hydrogen internal combustion engine injectors (102). The atomized lubrication
solution forms a thin lubricating film over moving parts of the injectors. The thin
lubricating film reduces friction-induced wear of injector components caused by
high-pressure hydrogen operation. The lubrication film is configured to remain
localized to injector components without interfering with hydrogen fuel flow. The10
atomized lubrication solution enables effective lubrication without excessive
accumulation. The lubrication film supports smooth movement of needle valves and
sealing elements. The controlled atomization maintains injector response
characteristics. The lubrication film contributes to consistent injector performance.
The lubrication delivery improves injector service life.15
[0043] In some embodiments, the micro lubrication system (100) operates in
coordination with a hydrogen fuel system of the hydrogen internal combustion
engine. The coordination ensures that lubrication delivery does not interfere with
hydrogen fuel atomization or combustion efficiency. The lubrication solution is
delivered in quantities selected to avoid adverse effects on fuel-air mixing. The20
system maintains separation between lubrication and fuel delivery paths. The
coordination enables simultaneous fuel injection and lubrication. The micro
lubrication system (100) is compatible with existing hydrogen injector designs. The
system maintains combustion stability while enhancing injector durability. The
coordination supports efficient engine operation. The system ensures reliable25
injector function under varying conditions.
[0044] The micro lubrication system (100) provides improved durability and
reliability of hydrogen internal combustion engine injectors (102) by addressing
lubrication deficiencies associated with hydrogen fuel. The system reduces
maintenance requirements by minimizing wear-related injector degradation. The30
micro lubrication system (100) supports long-term engine operation in high-duty
14
applications. The architecture enables scalable implementation across different
engine configurations. The system provides precise, controlled, and repeatable
lubrication delivery. The micro lubrication system (100) enhances injector
performance consistency over time. The system mitigates operational risks
associated with dry fuel environments. The overall design provides a robust and5
manufacturable solution. The micro lubrication system (100) is well suited for real-
world hydrogen engine applications.
[0045] FIG. 4 illustrates a flowchart showing a method (400) for operating a micro
lubrication system (100) for hydrogen internal combustion engine injectors (102),
according to an embodiment of the present disclosure.10
[0046] At operation 402, the at least one delivery rail (104) is operatively coupled
to the plurality of hydrogen internal combustion engine injectors (102). The micro
lubrication system (100) is configured to supply a lubrication solution to moving
components of the hydrogen internal combustion engine injectors (102) during
engine operation. The lubrication solution is delivered in a controlled and15
predefined manner to mitigate friction and wear associated with high-pressure
hydrogen injection. The micro lubrication system (100) is designed to operate
independently of hydrogen fuel delivery while remaining coordinated with overall
engine operation. The system enables precise lubrication of injector components
without adversely affecting hydrogen fuel atomization or combustion20
characteristics. The architecture of the micro lubrication system (100) allows
integration with existing hydrogen internal combustion engine layouts. The system
is particularly suited for engines operating under high load, high pressure, or
extended duty cycles. The micro lubrication system (100) enhances injector
durability and operational reliability over prolonged usage.25
[0047] The at least one delivery rail (104) serves as a common distribution conduit
for the lubrication solution while maintaining pressure stability along its length. The
at least one delivery rail (104) is configured to withstand operating pressures
associated with micro lubrication delivery. The arrangement of the at least one
delivery rail (104) enables compact packaging and reduces routing complexity. The30
at least one delivery rail (104) may be mounted adjacent to or integrated with an
15
injector mounting structure of the hydrogen internal combustion engine. The at least
one delivery rail (104) facilitates equalized lubrication supply to multiple injectors.
The at least one delivery rail (104) contributes to uniform lubrication delivery across
the injector array.
[0048] At operation 404, the plurality of micro dozers (106), each micro dozer being5
associated with a respective hydrogen internal combustion engine injector, is
fluidically coupled to the at least one delivery rail (104) and the plurality of micro
dozers (106) being configured to deliver the predefined amount of lubrication
solution to the plurality of hydrogen internal combustion engine injectors (102).
[0049] The plurality of micro dozers (106) meter the lubrication solution10
independently, thereby enabling injector-specific lubrication control. In some
embodiments, the plurality of micro dozers (106) are positioned directly on or
adjacent to the at least one delivery rail (104) to minimize flow path length. The
plurality of micro dozers (106) are configured to deliver lubrication solution to
moving components of the injectors including needle valves and sealing elements.15
The plurality of micro dozers (106) operate under a predefined pressure to ensure
fine atomization of the lubrication solution. The independent operation of the
plurality of micro dozers (106) enables compensation for injector-to-injector
variation. The plurality of micro dozers (106) support precise and repeatable
lubrication delivery. The plurality of micro dozers (106) contribute to consistent20
injector performance across the engine.
[0050] At operation 406, the oil delivery module (108) is fluidically coupled to the
at least one delivery rail (104) via the supply line (112) and the oil delivery module
(108) being configured to deliver the lubrication solution to the at least one delivery
rail (104). Further, the oil delivery module (108) comprises the electric pump25
configured to deliver a steady and controlled flow of the lubrication solution to the
at least one delivery rail (104). In some embodiments, the oil delivery module (108)
is configured as a dedicated lubrication module separate from a hydrogen fuel
supply system of the hydrogen internal combustion engine. This separation prevents
contamination and functional interference between lubrication and fuel delivery30
systems. The oil delivery module (108) may be mounted remotely from the injectors
16
while remaining fluidically connected through the supply line (112). The oil
delivery module (108) is configured to operate across a range of engine speeds and
loads. The electric pump enables precise control of lubrication flow rate. The oil
delivery module (108) supports long-term lubrication stability.
[0051] The supply line (112) extends between the oil delivery module (108) and the5
at least one delivery rail (104) and is configured to convey the lubrication solution
during operation of the hydrogen internal combustion engine. In some
embodiments, the supply line (112) is configured to continuously deliver the
lubrication solution during engine operation. The supply line (112) is dimensioned
to maintain stable flow characteristics while minimizing pressure losses. The supply10
line (112) may be routed to accommodate engine packaging constraints. The supply
line (112) is configured to withstand temperature variations encountered during
engine operation. The continuous delivery of lubrication solution ensures consistent
availability at the at least one delivery rail (104). The supply line (112) supports
steady-state and transient lubrication demands. The configuration of the supply line15
(112) contributes to overall system robustness. The supply line (112) enables
uninterrupted lubrication under varying operating conditions.
[0052] At operation 408, the microcontroller (110) communicatively coupled to the
oil delivery module (108) and the plurality of micro dozers (106), is configured to
regulate a predefined pressure in the plurality of micro dozers (106) to atomize the20
lubrication solution, forming a thin lubricating film over moving parts of the
plurality of hydrogen internal combustion engine injectors (102). The
microcontroller (110) controls operation of the electric pump and associated control
elements to establish the predefined pressure. In some embodiments, the
microcontroller (110) regulates the predefined pressure based on operating25
conditions of the hydrogen internal combustion engine. Such operating conditions
may include engine speed, load, temperature, or injector actuation frequency. The
microcontroller (110) enables adaptive lubrication control to suit dynamic engine
conditions. The microcontroller (110) ensures that lubrication delivery remains
within predefined operating limits. The microcontroller (110) contributes to precise30
17
pressure regulation for atomization. The microcontroller (110) enhances reliability
of lubrication delivery.
[0053] At operation 410, the control line (114) is fluidically coupled to the plurality
of micro dozers (106) and the control line (114) being configured to convey the
predefined pressure to the plurality of micro dozers (106). The control line (114)5
serves as a pressure transmission path between the pressure-regulating elements and
the plurality of micro dozers (106). The control line (114) is configured to maintain
the predefined pressure within the plurality of micro dozers (106) to prevent over-
lubrication and under-lubrication. The control line (114) ensures that pressure
variations are minimized across the plurality of micro dozers (106). The control line10
(114) supports consistent atomization of the lubrication solution. In some
embodiments, the control line (114) extends along the at least one delivery rail (104)
to supply pressure uniformly. The control line (114) contributes to stable lubrication
delivery during transient engine operation. The control line (114) enhances
repeatability of micro dozer operation. The control line (114) supports coordinated15
pressure control across multiple injectors.
[0054] Various embodiments of the present invention provide notable advantages
through a micro lubrication system (100) for hydrogen internal combustion engine
injectors (102) incorporating an oil delivery module (108), a delivery rail, a plurality
of micro dozers (106), a microcontroller (110), and a control line (114) configured20
to operate as an integrated lubrication architecture. The micro lubrication system
(100) is designed specifically to enhance durability and reliability of injectors used
in hydrogen internal combustion engines by supplying a controlled lubrication
solution directly to injector moving components. Electronic flow control through
the plurality of micro dozers (106) enables precise and repeatable delivery of oil to25
each injector, thereby eliminating a need for disassembly or manual cleaning
throughout an operational lifetime of the engine. The micro dozers are attached to
the delivery rail and deliver lubrication directly to the injectors, which simplifies
packaging and reduces overall system complexity. Gradual wear of an oil coating
on injector components is compensated by continuous and metered replenishment30
of the lubrication solution, ensuring sustained protection over time. The controlled
18
delivery prevents over-lubrication and under-lubrication, thereby maintaining
injector responsiveness and operational stability. By avoiding fuel-borne additives,
the micro lubrication system (100) reduces cost and complexity associated with
constant replenishment and optimization of additives for safe combustion. The
microcontroller (110) regulates pressure and flow conditions to ensure effective5
atomization of the lubrication solution, forming a thin and uniform lubricating film
on injector components. Stable lubrication conditions reduce friction-induced wear
caused by high-pressure hydrogen operation. Coordinated operation of the oil
delivery module (108) and control line (114) maintains consistent lubrication
performance across varying engine operating conditions. Overall, the electronically10
controlled and rail-mounted micro lubrication system (100) improves long-term
injector reliability and supports sustained engine performance in demanding
hydrogen engine applications.
[0055] It has thus been seen the micro lubrication system (100) for hydrogen
internal combustion engine injectors (102), as described. The micro lubrication15
system (100) in any case could undergo numerous modifications and variants, all of
which are covered by the same innovative concept; moreover, all of the details can
be replaced by technically equivalent elements. In practice, the components used,
as well as the numbers, shapes, and sizes of the components can be whatever
according to the technical requirements. The scope of protection of the invention is20
therefore defined by the attached claims.

CLAIMS

1. A micro lubrication system (100) for hydrogen internal combustion engine
injectors (102), the micro lubrication system (100):
at least one delivery rail (104) configured to be operatively coupled to5
a plurality of hydrogen internal combustion engine injectors (102);
a plurality of micro dozers (106), each micro dozer being associated
with a respective hydrogen internal combustion engine injector, the plurality
of micro dozers (106) being fluidically coupled to the at least one delivery rail
(104) and configured to deliver a predefined amount of lubrication solution to10
the plurality of hydrogen internal combustion engine injectors (102);
an oil delivery module (108) fluidically coupled to the at least one
delivery rail (104) via a supply line (112) and configured to deliver the
lubrication solution to the at least one delivery rail (104),
wherein the oil delivery module (108) comprises an electric pump15
configured to deliver a steady and controlled flow of the lubrication solution
to the at least one delivery rail (104);
a microcontroller (110) communicatively coupled to the oil delivery
module (108) and the plurality of micro dozers (106), wherein the
microcontroller (110) is configured to:20
regulate a predefined pressure in the plurality of micro dozers
(106) to atomize the lubrication solution, forming a thin lubricating
film over moving parts of the plurality of hydrogen internal
combustion engine injectors (102); and
a control line (114) fluidically coupled to the plurality of micro dozers25
(106) and configured to convey the predefined pressure to the plurality of
micro dozers (106)
2. The micro lubrication system (100) as claimed in claim 1, wherein the
lubrication solution is supplied in a quantity sufficient to lubricate moving30
components of the plurality of hydrogen internal combustion engine injectors
(102) including needle valves and sealing elements.
3. The micro lubrication system (100) as claimed in claim 1, wherein the oil
delivery module (108) is configured as a dedicated lubrication module
separate from a hydrogen fuel supply system of the hydrogen internal5
combustion engine.
4. The micro lubrication system (100) as claimed in claim 1, wherein each of
the plurality of micro dozers (106) is configured to meter the lubrication
solution independently such that each hydrogen internal combustion engine
injector receives an individually controlled amount of lubrication solution.10
5. The micro lubrication system (100) as claimed in claim 1, wherein the control
line (114) is configured to maintain the predefined pressure within the
plurality of micro dozers (106) to prevent over-lubrication and under-
lubrication of the plurality of hydrogen internal combustion engine injectors
(102).15
6. The micro lubrication system (100) as claimed in claim 1, wherein the
microcontroller (110) is configured to regulate the predefined pressure based
on operating conditions of the hydrogen internal combustion engine.
7. The micro lubrication system (100) as claimed in claim 1, wherein the
predefined pressure is selected such that the lubrication solution reduces20
friction-induced wear of injector components caused by high-pressure
hydrogen operation.
8. The micro lubrication system (100) as claimed in claim 1, wherein the micro
lubrication system (100) is configured to operate in coordination with a
hydrogen fuel system such that lubrication of the plurality of hydrogen25
internal combustion engine injectors (102) does not interfere with combustion
efficiency of hydrogen fuel.
9. The micro lubrication system (100) as claimed in claim 1, wherein the supply
line (112) is configured to continuously deliver the lubrication solution from
the oil delivery module (108) to the at least one delivery rail (104) during30
operation of the hydrogen internal combustion engine.
10. A method (400) for operating a micro lubrication system (100) for hydrogen
internal combustion engine injectors (102), the method (400) comprising:
coupling at least one delivery rail (104) operatively to a plurality of
hydrogen internal combustion engine injectors (102);
fluidically coupling a plurality of micro dozers (106), each micro5
dozer being associated with a respective hydrogen internal combustion engine
injector, to the at least one delivery rail (104) and the plurality of micro dozers
(106) being configured to deliver a predefined amount of lubrication solution
to the plurality of hydrogen internal combustion engine injectors (102);
fluidically coupling an oil delivery module (108) to the at least one10
delivery rail (104) via a supply line (112) and the oil delivery module (108)
being configured to deliver the lubrication solution to the at least one delivery
rail (104),
wherein the oil delivery module (108) comprises an electric pump
configured to deliver a steady and controlled flow of the lubrication solution15
to the at least one delivery rail (104);
regulating, via a microcontroller (110) communicatively coupled to
the oil delivery module (108) and the plurality of micro dozers (106), a
predefined pressure in the plurality of micro dozers (106) to atomize the
lubrication solution, forming a thin lubricating film over moving parts of the20
plurality of hydrogen internal combustion engine injectors (102); and
fluidically coupling a control line (114) to the plurality of micro
dozers (106) and the control line (114) being configured to convey the
predefined pressure to the plurality of micro dozers (106).