FORM 2
THE PATENT ACT 1970

The Patents Rules, 2003
COMPLETE SPECIFICATION
(See section 10 and rule 13)

1. TITLE OF THE INVENTION
Vehicle Tyre Deflating System

2. APPLICANT
(a) NAME MAHINDRA & MAHINDRA LIMITED

(b) NATIONALITY : An Indian Company registered under the Companies
Act, 1956
(c) ADDRESS R&D Center, Automotive Division,
Mahindra & Mahindra Limited,
89, M.I.D.C., Satpure, Nashik - 422 007, Maharashtra, India

3. PREAMBLE TO THE DESCRIPTION

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

Vehicle Tyre Deflating System

Field of Invention

The present invention is related to a vehicle tyre deflating system, more
particularly, the present invention is related to a vehicle tyre deflating system for
tyre deflation test as required by Federal Motor Vehicle Safety Standards
(FMVSS 110).

Background and Prior Art

To meet the FMVSS 110 standards for the deflated tyre retention test, tyre of the
vehicle need to be deflated at a random rate while the vehicle is driven at the high
speeds. The vehicle is loaded to the maximum loaded vehicle weight with the
vehicle travelling in straight line at high speed. Tyre is deflated to simulate the
rapid loss of inflation pressure. The FMVSS 1 10 standard does not talk about
how to simulate rapid deflating of a tyre. During the tyre deflating test, the
vehicle has to be stopped with controlled braking application and tyre bead should
not be separated from the rim flange when the tyre deflation takes place. Prior art
discloses some vehicle tyre deflating systems which meets with varying degrees
of success.

United States Patent US7,121,760 discloses method and apparatus for deflating
tyres of a trailing vehicle. In this, tyre deflating is deployed from a leading
vehicle to cause deflation of tyres of a trailing vehicle. The deflating device has
two primary components a deployable member, with a plurality of tyre piercing
spikes mounted thereon, and a launch assembly designed to deposit the deployable
member on a road surface in proper position for at least one of the tyres of a
trailing vehicle to expose at least some of the spikes which penetrate and deflate the tyres, the remaining spikes being released in a safe manner. The system is complex and requires at least two vehicles to deflate the tyre of a vehicle.

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German Patent No. GB2397114 describes a laser guided tire deflation system
having two or more permanently fixed rotating mountings, cylindrical in form and
loaded with tyre deflating darts. The system is used to deflate the tyres of vehicles
during pursuit, the dart puncturing the tyre and causing it to deflate. The dart made
of impact breakable plastic is fitted with a brightly coloured dye or powder to
visually allow the operator to monitor the success of the aim. The rotating cylinder arrangement allows consecutive darts to be fired aligning each one in sequence with the positioned laser guide.

It is a complex system and external power source such as battery or compressed
air source is required to operate the system. The darts are the recurring
requirements to operate the system.

United States patent US5,611,408 talks about a device for remotely disabling a
vehicle by deflation of the vehicle tyres. The device is mounted on an underside
of a chase vehicle. A laser light in the device indicates to the agent where a
projectile expelled by the device will pass. The device is operated by directing the
laser light at an underside of a chased vehicle and causing the device to expel the
projectile. When the projectile is so expelled, it extends numerous spikes which destroy and deflate the chased vehicle's tyres thereby disabling the chased vehicle and preventing harm to innocent by-standards.

The system is complex and requires at least two vehicles to deflate the tyre of a
vehicle being chased. To deflate the tyres of a vehicle being chased, the vehicle
should be certain range. This system may also lead to deflation of tyres of a
chasing vehicle if proper care is not taken.

The entire prior art concepts talks about deflating the tyres of a vehicle but none
of the concept deflates the tyres at a particular/defined rate. All the systems in
prior art damage the tyres to be deflated. Moreover, these prior art systems are

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complex and costly. Also, the prior art tyre deflating systems are not safe and may
lead to accident. Therefore, there is a need to provide a simple but novel tyre
deflating system. Most of the prior art systems are for deflating tyres of a fleeing
vehicle.

Objectives of the Present Invention:

An object of the present invention is to provide a tyre deflating system, which deflates tyre with a prescribed rate of air expelled out therethrough.
Another object of the present invention is to provide a tyre deflating system in which tyre deflation is achieved by unplugging the valve.

Yet another object of the present invention is to provide a tyre deflating system
that can be mounted without requiring major modifications to a wheel rim or the
tyre.

Still another object of the present invention is to provide a tyre deflating system
for deflating tyre of a vehicle without causing irreversible damage to the tyre and
the rim.

Further object of the present invention is to provide a tyre deflating system
operated by a remote or by external trigger.

Summary of the invention

Accordingly, the present invention provides a tyre deflating system for a vehicle, the tyre comprising a first valve to fill air in the tyre wrapped around a metal rim, the tyre deflating system comprising:
an air pressure release port to release air from the tyre; a mounting plate secured to the metal rim;

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a central processing unit secured to the mounting plate, the central processing unit capable of operating the air release port by operating a second valve, the central processing unit comprises,
a processor,
a receiver for receiving radio frequency waves, and
a battery for providing power thereof;
a remote switch capable of transmitting the radio frequency waves to the receiver of the central processing unit,
wherein upon receiving radio frequency waves from the remote switch, the
processor operates to activate the second valve from closed position to open
position and thereby activating air pressure release port causing pressurized air
inside the tyre to escape at a pre-defined rate therethrough, thereby simulating a
puncture condition of the tyre.

Typically, wherein the mounting plate is secured on the metal rim by mounting
studs.

Typically, wherein the second valve is a pneumatic valve.

Typically, wherein the second valve is a pneumatic solenoid valve.

Brief description of drawings
The objectives and advantages of the present invention will become apparent from
the following description read in accordance with the accompanying drawings
wherein,

Figure 1 shows the schematic side view of a tyre deflating system along with a
tyre in accordance with the present invention; and

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Figure 2 shows a front view of the tyre deflating system along with the tyre in accordance with the present invention.

Detail description of the present invention
The foregoing objects of the present invention are accomplished and the problems
and shortcomings associated with the prior art, techniques and approaches are
overcome by the present invention as described below in the preferred
embodiment.

Accordingly, the present invention provides a tyre deflating system which deflates
tyre at a prescribed rate with a prescribed rate of air expelled out therethrough.
Further, the tyre deflating system provides the tyre deflation by unplugging the
valve. Furthermore, the tyre deflating system can be mounted without requiring
major modifications to a wheel rim or the tyre. Moreover, the tyre deflating
system deflates the tyre of a vehicle without causing irreversible damage to the
tyre and the rim and the tyre deflating system can be operated by a remote or by
external trigger.

This present invention is illustrated with reference to the accompanying drawings,
throughout which reference numbers indicate corresponding parts in the various
figures. These reference numbers are shown in bracket in the following
description.

Referring now to figures I and 2, various views of tyre deflating system for a
vehicle in accordance with the present invention is illustrated. Specially, the figure
I shows the tyre deflating system (100) mounted on a tyre (200). The tyre (200) is
wrapped around a metal rim (120). Further, the tyre (200) has a first valve (130) to
fill up the air in the tyre (200).

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The tyre deflating system (100) includes a mounting plate (10), a central
processing unit (20), an air pressure release port (22), a second valve (30) and a
remote switch (40). The mounting plate (10) is secured to a metal rim (120). For
example, the present invention shows the mounting plate (10) secured on the
metal rim (120) by at least two mounting studs (8). The central processing unit
(20) is secured over the mounting plate (10). The tyre deflating system (100)
rotates along with the metal rim (120) as the vehicle moves forward or backward.
In an embodiment, the mounting plate (10) is made of metal alloy or fibre
reinforced plastic or any suitable material having predefined hardness.

Further, the central processing unit (20) in secured on the mounting plate (10).
The central processing unit (20) is capable of operating the air pressure release
port (22) by operating a second valve (30). In an embodiment, the second valve
(30) is a pneumatic valve. In another embodiment, the second valve (30) is a
pneumatic solenoid valve.The central processing unit (20) comprises a processor
(12), a receiver (not shown) for receiving radio frequency waves, and a battery
(14) for providing power thereto. The central processing unit (20) is capable of
receiving the radio frequency waves from the remote switch (40).

Specifically, the remote switch (40) is capable of transmitting the radio frequency
waves to the receiver of the central processing unit (20). In an embodiment, the
remote switch (40) is operated by co-driver/occupant of the vehicle or by an
electrical actuator which is triggered by data acquisition system, to activate the tyre deflating system (100).

In an embodiment of the present invention the tyre (200) is a tubeless tyre. In
another embodiment, the tyre (200) includes a tube to fill air therein.

During the operation, the tyre (200) is inflated by filling the air through the first
valve (130) as the normal practice followed and the vehicle is made to run on the

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ground. The second valve (30) is kept in close position when the test is not being
conducted or when the vehicle is in running condition.

Further, when the vehicle achieves desired speed, a button for deflating the tyre
(not numbered) on the remote switch (40) is pressed by the co-driver or occupant
of the vehicle. A transmitter (not shown) fitted within the remote switch (40)
transmits radio frequency (RF) signal to the receiver of central processing unit
(20). Thereafter , the processor (12) inside the central processing unit (20)
operates the solid state relay embedded within its circuit which subsequently triggers the second valve (361 to change its position from `closed' to `open' state. As the second valve (30) reaches to its open position, pressurized air inside the tyre (200) escapes to the atmosphere at a pre-defined rate through the air pressure release port (22) simulating the puncture condition of the tyre (200).

Advantages of the present invention;

• Air pressure release port for discharge of air does not get damaged during
the test and it can be reused number of times.
• The system is very easy to oJ)erate.
• The system is quick and easy to install on the rim of a test vehicle.
• The system is light weight and handy to carry at any test location.
• The system does not destroy / tear the rubber tyre.
• Driver and co-driver remain alert / informed about the consequences of
tyre puncture condition, as co-driver himself activates the system with
remote.
• The system is cost effective.
• The system has versatility to be mounted on any vehicle.

It is to be understood that the present invention is not limited in its application to
the details of the construction and to the arrangement of the components as
mentioned in the above description or illustrated in the drawings. However, it is

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to be taken as the preferred example of the invention and that various changes in
the shape, size and arrangement of parts considering the space constraint may be
resorted to without departing from the spirit of the invention. The invention is
capable of other embodiments and of being practised and carried out in various
ways. Also, the terminologies used herein are for the purpose of description and
should not be regarded as limiting.

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We Claim:
I A tyre deflating system for a vehicle, the tyre comprising a first
valve to fill air in the tyre wrapped around a metal rim, the tyre deflating system
comprising:
an air pressure release port to release air from the tyre; a mounting plate secured to the metal rim;
a central processing unit secured to the mounting plate, the central
processing unit capable of operating the air release port by operating a second
valve, the central processing unit comprises,
a processor,
a receiver for receiving radio frequency waves, and a battery for providing power thereof;
a remote switch capable of transmitting the radio frequency waves to the
receiver of the central processing unit,
wherein upon receiving radio frequency waves from the remote switch, the
processor operates to activate the second valve from closed position to open
position and thereby activating air pressure release port causing pressurized air
inside the tyre to escape at a pre-defined rate therethrough, thereby simulating a puncture condition of the tyre.

2. The tyre deflating system of claim 1, wherein the mounting plate is
secured on the metal rim by mounting studs.

3. The tyre deflating system of claim 1, wherein the second valve is a
pneumatic valve.

4. The tyre deflating system of claim 1, wherein the second valve is a pneumatic solenoid valve.