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


COMPLETE SPECIFICATION
(See Section 10; rule 13)
TITLE OF THE INVNTION Automated Hydraulic Tipper System And Method Of Testing Thereof
APPLICANTS
TATA MOTORS LIMITED, an Indian company
Having its registered office at Bombay House,
24 Homi Mody Street, Hutatnia Chowk,
Mumbai 400 001 Maharashtra, India
INVENTORS
Dhinaharan Ramalingam, Upendra Kumar Mishra,
Dilip Ghosh and Ravindra Babhulkar
AH are 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
The present invention relates to the test set up for tipping of automobile and more particularly it relates to automated hydraulic tipper system for automobile and method of testing thereof.
BACKGROUND OF INVENTION
Generally Hydraulic tipping system is used on dumper truck and trailer for operating a load body. The load body is connected to the frame of the vehicle by way of two articulated joint, enabling it to tip, and it is designed to be moved between a lowered position and a raised tipping position. The existing hydraulic tipping system is located behind the drivers cab. Hydraulic power is supplied by the transfer of energy from power take off (PTO) to the pump. PTO engagement with vehicle gear box is controlled pneumatically from the driver cab.
Input air which is required for valve supplied by drier and distribution unit (DDU), air supply is given to the axial piston pump by three position pneumatic valve which is controlled from the driver cab. Axial piston pump used to pump the oil inside the telescopic type of cylinder.
In the existing hydraulic tipping system the load body can be tipping and lowering down by telescopic type of cylinder by manually operating the three position pneumatic valve which is controlled from the driver cab.
Existing test method normally takes more time, manpower and fuel consumption to complete the test. Micro PLC controlled test set up using existing hydraulic cylinder can complete the tipping/lowering down mechanism test in lesser time, manpower and fuel consumption.

OBJECTS OF INVENTION
The main object of the present invention is to provide an automated hydraulic tipping system for automobile for tipping and lowering test setup.
Another object of the present invention is to provide a novel method of testing hydraulic tipping and lowering down.
Another object of the present invention is to provide an automated hydraulic tipping and lowering down test set up which is simple in construction and cost effective.
Yet another object of the present invention is to provide an automated hydraulic tipping and lowering down test set up which reduce the testing time, manpower and fuel consumption.
BRIEF DESCRIPTION OF INVENTION
The Automated hydraulic tipper test set up in accordance with the present invention comprises; at least three piece of payloads (1) which are mounted on the vehicle load body to provide load on the vehicle, angles/channel are welded with load body over the payload to hold the load during testing, a temperature sensing element, preferably a thermocouple (2), which is connected with the data logger (3) to measure the hydraulic oil temperature dipped inside the hydraulic oil tank, water sprayed on the hydraulic oil reservoir having water pipeline (4), blower (5) for supplying cool air for cooling the hydraulic oil, at least two limit switches (6,7) which are mounted with the limit switch mounting bracket (8,9) below the front part of the load body with the battery bracket and rear part of the load body on the long member are connected with micro PLC, three position pneumatic (13)

valve is interface with compressed air reservoir (12) and said two electro pneumatic solenoid valves (14,15) and said an axial piston pump (21).
At least two solenoid valve (14,15) are interfaced with said flow control valve (16,17) for supplying control air to the said spool valve connectors (18,19) through the connection line and said micro PLC's (26,27) is interfaced with power supply sources (24,25) and said at least two solenoid valves (14,15) through said connection lines.
The said automated hydraulic tipper system is basically a pneumatic assisted hydraulic controlled system shown in figure 1. The said test setup is controlled by micro PLC's (26, 27), giving electrical power supply to said micro PLC's (26, 27) start the automated hydraulic tipper test setup. The said micro PLC (27) first output electrical signal triggers the solenoid valve (14) for supplying the air to pneumatic connection of air control spool valve connector (19) for tipping operation for the predetermined duration before that said PLC (27) checks the input signal from both limit switches (6, 7). If said limit switch (6) is in normally closed condition then tipping operation takes place. The said micro PLC (27) output electrical signal triggers the pneumatic solenoid valve (15) for supplying the air to pneumatic connection of air control spool valve connector (18) for lowering operation before that said micro PLC (27) checks the input signal from limit switch (7), If said limit switch (7) is in normally closed condition load body will hold for the predetermine duration and then stop the output electrical signal for solenoid valve (6) which will stop the air supply to pneumatic connection of air control spool valve connector (19) for tipping and give air supply to air controlled spool valve connector (18) for lowering down, which completes one cycle. Likewise the test cycle continues till the test target cycle completes.

BRIEF DESCRIPTION OF DRAWINGS
Figure 1 - Shows the schematic diagram of hydraulic tipping set up of vehicle. Figure 2 - Shows the hydro-pneumatic circuit diagram. Figure 3 - Shows the electrical circuit block diagram.
DETAILED DESCRIPTION OF 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,
Now referring to figure 1, hydraulic tipping test setup of vehicle comprises; at least three piece of payload (1) to provide load on the vehicle mounted on the vehicle load body which is restricted by the welding of angles to avoid abnormal movement of load during testing of hydraulic tipping system, At least five angle/channel are provided by welding over the load body of vehicle to restrict said pay loads. Said payloads are made up of concrete block.
Thermocouple (2) for measuring the temperature of hydraulic tank oil, said thermocouple is disposed inside the hydraulic oil tank and is connected through data logger (3), Water pipe line (4) which is mounted over the said hydraulic oil tank with water supply source for supplying water, blower (5) with power supply source for supplying air to the hydraulic oil tank to control the hydraulic tank oil temperature,
First Limit switch (6) for controlling the lowering movement of the load body and is mounted on bracket (8) provided on the vehicle battery fixture.
Second limit switch (7) for controlling the tipping movement of the load body and is mounted on bracket (9) provided at the rear end of the long member and below the load body of vehicle.

Wheel chock (10) placed with the tyre to avoid abnormal movement of vehicle during testing..
Support (11) is provided at the rear end of the vehicle below the long member for preventing the abnormal toggling of vehicle during tipping operation.
Now referring to figure-02, which shows the hydro-pneumatic circuit diagram and electrical circuit block diagram respectively,
Said hydro-pneumatic circuit diagram comprises; drier and distribution unit (or a compressed air reservoir) (12), three position pneumatic valve (13), first solenoid valve (14), second solenoid valve (15), unidirectional flow control valves (16,17) for supplying air, spool valve connectors (18,19), hydraulic sump (20) for collecting the oil, axial piston pump (21) for supplying air to pump the oil inside the cylinder (22), T- connector (23).
The input air supply required to run the test is taken from the drier and distribution unit (12) of vehicles. The connection line is provided between said drier and distribution unit (12) and said three position pneumatic valve (13). The connection line is provided between the delivery port of the said three position pneumatic valve (13) and the inlet port of the said axial piston pump (21) which is used to supply the air to pump the oil inside the said cylinder (22). Air supply line is connected between the input port of the said three position pneumatic valve (13) and delivery port of the solenoid valve (14) which is actuated by electrical signal through electrical line received from said micro PLC (27).
Flow control valve (17) which supplies the regulated air is connected between the said solenoid valve (14) and pneumatic connection of said air control spool valve connector (19) for tip. Said spool valve connector (19) is mounted on the said hydraulic sump (20) through said flow control valves (16, 17). The tipping stroke

or tipping cycle rate is controlled with the help of the said unidirectional flow control valves (16, 17). The air controlled spool valve (19) gets the input air signal during upward stroke from solenoid valve (14).
Air supply line is connected between the said input port of the three position pneumatic valve (13) and delivery port of the solenoid valve (15) through T-connector (23) which is actuated by electrical signal through electrical line received from said micro PLC (27) . Flow control valve (16) which supply the regulated air, is connected between the solenoid valve (15) and spool valve connector (18) for lowering operation. The spool valve connector (18) gets the input air signal during downward stroke from solenoid valve (15).
The spool valve gives the direction to the oil. During upward stroke of the said cylinder (22), the spool valve allows the oil to flow from said hydraulic sump (20) to said axial piston pump (21) and from said axial piston pump (21) to the said cylinder (22). During downward motion of the said cylinder (22) the spool valve blocks the supply of oil from said axial piston pump (21) to said cylinder (22) and allows the oil from the said cylinder (22) to flow in to the sump (20). The position of load body of vehicle is controlled by roller type first limit switch (6) and second limit switch (7) which are fitted below the front and rear portion of the load body of vehicles. Said limits switches (6, 7) communicate the position of said cylinder (22) with said micro PLC's (26, 27). The output from each limit switches is given to the said micro PLC. With the help of these output signals the PLC gives the signal to the said first solenoid valves (14) and second solenoid valve (15).
Now referring to figure-03, which shows the electrical circuit block diagram which comprises ; at least two electrical power supply (24,25) which is drawn by said micro PLC's (26,27) through the electrical line, at least two programmable logic controllers (PLC), first PLC (26) is provided for starting the program and

another PLC (27) is provided for running the program . Both said PLC's are is connected with said first limit switches (6) and second limit switch (7) and said first solenoid valve (14) and second solenoid valve (15).
Initially said PLC (26) checks the input signal from both said limit switches (6, 7). If said limit switch (6) is in normally closed condition, the output electrical signal of said micro PLC (27) triggers the first solenoid valve (14) for supplying the air to first spool valve connectors (19) for tipping operation.
The first output electrical signal from said Micro PLC (27) to solenoid valve (14) is stopped to prevent the air supply for tipping operation after getting the normally closed condition of limit switch (7). The said PLC (27) gives the output electrical signal to the said solenoid valve (15) for triggering after predetermined duration after getting the normally closed condition of said limit switch (7). This will give the holding position of the load body for predetermine duration, after predetermine duration lowering of the load body starts.
Stopping the electrical output signal from said Micro PLC (27) to solenoid valve (15) to stop the air supply for lowering operation after getting the normally closed condition of limit switch (6).
The said PLC (27) gives the electrical output signal to said solenoid valve (15)
after predetermine duration after getting normally closed condition of said limit
switch (6).Like wise the test cycle continues till the test target cycles completes.
The automated hydraulic tipping system is simple in construction and cost
effective.
Said automated hydraulic tipping system also reduces the testing time, manpower
and fuel consumption.

In accordance with the second embodiment of the present invention, Method of testing hydraulic tipper comprises;
a) Providing power supply to the said micro PLC through said connection lines,
b) checking input signal from said first and second limit switches (6 and 7),
c) triggering the first pneumatic solenoid valve (14) for supplying the air to first pneumatic connection of air control spool valve (19) for tipping operation,
d) Stopping the first output electrical signal from said Micro PLC (27) to solenoid valve (14) to stop the air supply for tipping operation after getting the normally closed condition of second limit switch
(7),
e) Giving output electrical signal from said PLC (27) to the solenoid valve (15) for triggering after predetermine duration of getting the normally closed condition of limit switch (7),
f) holding position of the load body for predetermine duration,
g) lowering of the load body After predetermine duration,
h) Stopping the electrical output signal from said Micro PLC (27) to solenoid valve (15) to stop the air supply for lowering operation after getting the normally closed condition of limit switch (6),
i) Giving electrical output signal from said PLC (27) to solenoid valve (14) after predetermine duration of getting normally closed condition of said first limit switch (6),
j) Repeating the above steps until the test target cycles completes.
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. An automated hydraulic tipper test setup for vehicles comprising
plurality of payloads mounted on vehicle load body to provide
load on the vehicle;
a hydraulic oil sump;
a piston pump for supplying oil from said sump into a
hydraulically operated cylinder;
a temperature sensing element coupled with data logger, dipped inside said hydraulic oil sump for measuring oil temperature;
first and second limit switches mounted below said vehicle load body for controlling tipping and lowering action of said vehicle load body;
at least two unidirectional flow control valves connected with pneumatic valve, a first and second solenoid valves and a first and second spool valve connectors for supplying regulated air to control tipping and lowering operation;
means for checking the input signal from said first and second limit switches; and
means for triggering required solenoid valves and spool valve connectors to supply air for tipping or lowering operation depending upon the input signal from said limit switches.
2. Automated hydraulic tipper test setup as claimed in claim 1 wherein said
means for checking the input signal from said first and second limit
switches is a first Programmable Logic Controller (PLC) and said means
for triggering required solenoid valves and spool valve connectors is a
second Programmable Logic Controller (PLC) and said first and second
limit switches are interfaced with said first and second PLC.

3. Automated hydraulic tipper test set up as claimed in claim 2, wherein said solenoid valves are interfaced with said first and second PLC.
4. Automated hydraulic tipper test set up as claimed in claim 1, wherein said pneumatic valve is a three position pneumatic valve interfaced with a compressed air reservoir, said first and second solenoid valves and said piston pump.
5. Automated hydraulic tipper test set up claimed in claim 1, wherein said flow control valve is interfaced between said first and second spool valve connectors and said first and second solenoid valves.
6. Automated hydraulic tipper test set up claimed in claim 1, wherein said first and second spool valve connectors are mounted on said hydraulic oil sump; wherein, during tipping operation, said first spool valve connector is configured to allow oil to flow from said hydraulic oil sump to said piston pump and from said piston pump to said hydraulically operated cylinder; and during lowering operation the second spool valve connector is configured to block supply of oil from said piston pump to said cylinder and to allow oil from said cylinder to flow into said sump.
7. Automated hydraulic tipper test set up claimed in claim 1 and 2, wherein said second PLC is configured to trigger said first solenoid valve to supply air to said first spool valve connectors for tipping operation after detecting normally closed condition of said first limit switch by said first PLC.
8. Automated hydraulic tipper test set up claimed in claim 1, 2 and 7, wherein said second PLC is configured to stop triggering said first

solenoid valve to prevent air supply for tipping operation and to hold said load body for a predetermined duration after detecting normally closed condition of said second limit switch by said first PLC.
9. Automated hydrauh'c tipper test set up ciaimed in claim I, 2, 7 and 8, wherein said second PLC is configured to trigger said second solenoid valve to supply air to said second spool valve connector for lowering operation after detecting normally closed condition of said second limit switch and the load body has been in hold position for a predetermined duration by said first PLC .
10. A Method of testing hydraulic tipper test setup as claimed inc claims 1 to 9 comprising the steps of;

a) providing power supply to said PLC;;
b) checking input signal from said limit switches;
c) triggering the first solenoid valve to supply air to pneumatic connection of air control spool valve connector for tipping operation after detecting normally closed condition of said first limit switch by said first PLC;
d) stopping electrical output signal from the second PLC to solenoid valve to stop the air supply for tipping operation after detecting normally closed condition of said second limit switch by said first PLC;
e) giving output electrical signal from said second PLC to said second solenoid valve to supply air to said second spool valve connector for lowering operation after detecting normally closed condition of said second limit switch and the load body has been in hold position for a predetermined duration by said first PLC ;
f) Repeating the above steps until the test target cycles completes.

11. Automated hydraulic tipper test set up and method of testing hydraulic tipper as herein described with reference to accompanying drawings.
Dated this 31st day of December 2008