FORM 2
THE PATENTS ACT 1970
(39 of 1970)
&
THE PATENTS RULES, 2003


COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVENTION UNIVERSAL TEST RIG
APPLICANTS
TATA MOTORS LIMITED, an Indian company
Having its registered office at Bombay House,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Chaskar Mithun Ravindra and Ghanwat Hemant Dattatray
All Indian Nationals of TATA MOTORS LIMITED,
An Indian company having its registered office
At Bombay House, 24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001 Maharashtra, India

PREAMBLE TO THE DESCRIPTION The following specification particularly describes the invention and the manner
in which it is to be performed.

FIELD OF INVENTION
This invention relates to universal test rig and more particularly it relates to test rig for the testing of various sensor used for measuring Acceleration, Strain, Temperature, voltage, current and Rotation per Minute of automobile Components.
BACKGROUND OF INVENTION
Generally various sensors are used with data acquisition systems to acquire data such as acceleration, strain, temperature, voltage, current and rpm of various components and parts of a vehicle. After completing one test, the setup needs to be removed and reconfigured for another test. This process involves lots of handling of the sensors and data acquisition systems which may result in malfunctioning of these equipments. These faulty equipments are used for another test and are detected as faulty after mounting and while calibrating. So it requires re-wiring and re-mounting of sensors which needs extra manpower, vehicle, fuel and time.
Also to check the outputs of different data acquisition systems and compare these outputs with standard data acquisition system, the full setup for both data acquisition system needs to be mounted on the vehicle. This will involve extra manpower, time, vehicle, fuel.
To address the above disadvantage, there was a need of test rig where wiring of sensors, functionality and correctness of the sensors can be checked. Also the output profiles of two different data acquisition systems can be compared to find out the fault and problems in data acquisition systems.

OBJECTS OF THE INVENTION
The main objective of the present invention is to provide the universal test rig for testing various sensors devices.
Another object of the present invention is to provide the universal test rig which facilitates to compare the result of two data acquisition system.
Yet another object of the present invention is to provide universal test rig which requires less time for testing various test device and also easy to handle.
STATEMENT OF INVENTION
Universal sensor testing arrangement comprising: a motor means coupled to a geared wheel through a coupling shaft, a geared wheel further coupled to the main shaft, end of said main shaft distal to geared wheel being connected to an elliptically shaped head cam; a cantilevered plate resiliently clamped on one end and placed proximal to said cam shaft, such that the elliptical cam pushes and bends said cantilevered plate in a downward direction upon rotation of said coupling shaft; and means for mounting required sensors and/or gauges provided in predetermined positions proximal to said motor means, geared wheel and/or cantilevered plate.
The arrangement containing said motor means clamped on a rigid base; said motor means is a DC motor with an operating voltage of 12 to 15V; a bending strain measurement guage is provided on said cantilevered plate to measure its bending strain when said plate is bent by said elliptical cam of said cam shaft; a full bridge and/or half bridge strain gauges are farther mounted on said cantilevered plate for

measuring the bending strain; said strain guages measuring torsional strain and axial strain are mounted on the coupling shaft of said motor means; a magnetic pick-up sensor means for measuring the rpm of said geared wheel is mounted proximal to said geared wheel; a gap of at least 5 mm is maintained between said magnetic pick¬up sensor and said geared wheel; a tri axial accelerometer and/or two axial accelerometer are mounted on said cantilevered plate for measuring vibrations of said plate; a thermocouple is connected to the outer body of said motor means or to said coupling shaft of the motor means for temperature measurement.
BRIEF DESCRIPTION OF INVENTION
According to the present invention, universal test rig for testing various sensor device comprises; motor (1), clamping means (2) for mounting said motor on base (3) , bracket (4) for mounting sensor for measuring the rpm of geared wheel (5), elliptically shaped cam (6) provided on shaft of the said motor, rectangular cantilevered plate(7) connected to spring arrangement clamping (8) for holding the said rectangular cantilevered plate(7) , strain gauge (9) mounted on the said rectangular cantilevered plate, main shaft (10) which is connected to the said wheel at one end and other end an elliptical cam is mounted.
A regulated dc power supply is required to drive the motor. This motor is directly coupled to a geared wheel with a shaft. This wheel (5) has 187 teeth and a bracket above it provided for mounting magnetic pick-up / proxy sensors. The shaft of the wheel has an elliptical cam (6) on one of the ends. Also there is one rectangular cantilevered plate (7) mounted with bolt and spring arrangement (8) parallel to the geared wheel.

BRIEF DESCRIPTION OF DRAWINGS
Figure-01 shows the block diagram of the present invention
Figure-02 shows the top view of the universal test rig in accordance with the present
invention
Figure-03 shows the side view of the universal test rig in accordance with the present
invention.
Figure-04 shows the line diagram of the universal test rig in accordance with the
present invention.
DETAILED DESCRIPTION OF THE INVENTION
Referring now to the drawings wherein the showings are for the purpose of illustrating a preferred embodiment of the invention only, and not for the purpose of limiting the same,
According to the present invention and referring figures 1 to 4, universal test rig for testing various sensor device comprises; motor, clamping means for mounting said motor on base , bracket (4) for mounting sensor for measuring the rpm of wheel (5), elliptical cam (6) provided on main shaft coupled to the said geared wheel, rectangular cantilevered plate(7) connected to spring arrangement clamping (8) for holding the said rectangular cantilevered plate(7) , strain gauge (9) mounted on the said rectangular cantilevered plate, main shaft (10) which is connected to the said wheel at one end and on other end elliptical cam is mounted.

A regulated dc power supply is required to drive the said motor. The said motor is directly coupled to a geared wheel (5) with a main shaft. The said wheel (5) has plurality of teeth and shaft, above it a bracket is provided for mounting proxy sensors for measuring the rpm of the geared wheel (5). The distal end of main shaft (10) has an eUiptically shaped cam (6). Also there is one rectangular cantilevered plate (7) mounted with bolt and spring arrangement clamping (8) parallel to the said geared wheel (5).
The Test Rig is small and compact in size; it contains a small DC-Motor (1) which is directly coupled to Gear Wheel (5) through the coupling shaft (10). The operating Voltage of the DC-Motor is 12v-15v, and the rated current is 0-3Amps. One end of the Shaft is permanently connected to the said Motor whereas another end of the Shaft is threaded and this is used for connecting geared wheel (5)
The said geared wheel contains threading on the opposite side of the shaft for connecting the eUiptically shaped head cam shaft. The said cam shaft comprises an elliptical cam (6) at the distal end. So when said wheel (5) rotates the cam shaft also rotates which in turn rotates the said elliptical cam enabling to press one end of the rectangular cantilevered plate(7). The other end of the rectangular cantilevered plate is bolted to base on the metal sheet. Said spring arrangement clamping (8) is placed below the said cantilevered plate (7) while bolting to reduce the noise generated while pressing the said cantilevered plate. The said cantilevered plate is used to measure the bending strain with the help of strain gauge (9) mounted on the said rectangular cantilevered plate (7). A full bridge and half bridge strain gauges can also be pasted or mounted on the said rectangular cantilevered plate (7) for measuring the bending strain. When the said geared wheel (5) rotates enabling the said cam shaft to rotate, the said elliptical cam of the said cam shaft presses the said rectangular cantilevered plate (7) in downward direction and releases it once in every revolution.
**

This causes plate to bend and bending strain can be measured on the plate through said strain gauge (9). By varying the RPM of said motor, different profiles for bending strain can be observed/plotted.
The torsional strain and axial strain can also be measured by mounting the strain gauges on the coupling shaft (10) of the said Motor.
The rectangular cantilevered plate can be used for measuring the vibrations. A tri axial accelerometer or two axis accelerometer can be mounted on the said rectangular cantilevered plate for measuring the vibrations of said cantilevered plate (7) so that the said accelerometer can be tested by plotting the profile of said accelerometer data. The said cantilevered plate moves up and down to generate vibrations which can be measured using accelerometer. The speed of the motor can be varied to observe different frequencies of vibration.
For measuring the speed (rpm) of said wheel (5) a Magnetic Pickup is mounted on top of the Geared wheel with the help of bracket (4). There should be 5 mm gap between the Magnetic Pickup and said Geared wheel (5). The excitation voltage to the Magnetic Pickup is 6volts. By varying the input supply to the said motor, speed of the said motor can be changed.
For Temperature measurement, a Thermocouple is connected to the outer body of the said Motor or to the coupling shaft (10) of the motor and run the motor for few minutes. For collecting data the said thermocouple is connected to the Data Acquisition system.
On this Test rig, several parameters like Vibration or Acceleration, Strain, Temperature, torque and Speed can be measured.

ADVANTAGES OF TEST RIG
• With this setup we can measure speed, torque, strain, acceleration, temperature, and voltage, current and digital pulses which cater to 90 % of sensors used for automotive measurements.
• We can test the various sensors, instruments and data acquisition systems for its validation and troubleshooting purpose.
• Due to in lab simulation of all such parameters it saves lots of time being spent over actual test setups.
• Due to trouble shooting, damages and in-correct data the actual test setup validation time was very high. Due to this test setup this time is being saved and data quality has improved during test measurements.
The foregoing description is a specific embodiment of the present invention. It should be appreciated that this embodiment is described for purpose of illustration only, and that numerous alterations and modifications may be practiced by those skilled in the art without departing from the spirit and scope of the invention. It is intended that all such modifications and alterations be included insofar as they come within the scope of the invention as claimed or the equivalents thereof

WE CLAIM
1. A universal sensor testing arrangement comprising:
a geared wheel coupled to a motor through a coupling shaft,
a geared wheel coupled to a main shaft at the distal end of said main shaft a
cam head is mounted;,
a cantilevered plate resiliently clamped on one end and placed proximal to
said cam, such that the cam head pushes and bends said cantilevered plate in a
downward direction upon rotation of said main shaft;
means for mounting sensors provided to mount sensor to measure speed of said
geared wheel;
gauges provided on said cantilevered plate at predetermined positions for measuring
bending strain of said cantilevered plate.
2. The arrangement as claimed in claim 1, wherein said motor is clamped on a
rigid base.
3. The arrangement as claimed in claim 1, wherein said motor is a DC motor
with an operating voltage of 12 to 15V.
4. The arrangement as claimed in claim 1, wherein said gauge provided on said cantilevered plate is a full bridge and/or half bridge Strain gauges for measuring the bending strain.
5. The arrangement as claimed in claim 1, wherein said coupling shaft comprises strain guages for measuring torsional strain and axial strain.

6. The arrangement as claimed in claim 1, wherein said sensor for measuring the speed of said geared wheel is a magnetic pick-up sensor.
7. The arrangement as claimed in claim 6, wherein a gap of at least 5 mm is maintained between said magnetic pick-up sensor and said geared wheel.
8. The arrangement as claimed in claim 1, wherein said cantilevered plate comprises tri axial accelerometer and/or two axial accelerometer for measuring vibrations of said plate.
9. The arrangement as claimed in claim 1, wherein outer body of said motor or said coupling shaft of said motor comprises a thermocouple for measuring temperature.
10. A universal sensor testing arrangement as hereinabove described with reference to the accompanying drawings.
Dated this 19th day of January 2009