FORM-2
THE PATENTS ACT, 1970
(39 of 1970)
& THE PATENTS RULES, 2003
PROVISIONAL
Specification
(See Section 10 and rule 13)

DRIVE SYSTEM
SPRYLOGIC TECHNOLOGIES LTD.
an Indian Company of A/1, Aplab House, Wagle Estate, Thane 400 604, Maharashtra, India
THE FOLLOWING SPECIFICATION DESCRIBES THE INVENTION


Field of Invention
This invention relates to the field of Drive System.
What is envisaged is an improved system of variable frequency drives that enhances the energy efficiency of pump based systems by adjustment of the speed ratio of the motive device (pump motor) to suit the current load conditions balanced with the need to adjust the speed ratio in anticipation of future load conditions.
The present invention provides an improved system for maximizing efficiency in the operation of pump based systems. The improved drive system is advantageously adapted for use in controlling the operation of pump based systems and, thus, is uniquely adapted for improving the efficiency of fuel dispenser and other liquid and gas dispenser systems.
In one form, the drive system utilizes means for adjusting the variable transmission of the system in accordance with a determination of load power, load speed, and necessary adjusted speed ratio of the transmission to cause the motive device speed to be a minimum in providing the desired
load power and speed.
In another form, where the driven motive device comprises a pump based system, the adjustment of the motive device is effected by adjusting the speed ratio of the drive that eventually controls the speed with which the pump dispenses based on anticipated pump load.
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The determination of the load parameters that determine the control and speed ratio of the drive is directly correlated with information relative to the operating characteristics of the pump based system or other motive device such that the control of the drive system is effected by bringing the operation thereof to the point of optimum energy efficiency dictated by the determined characteristics. The drive system is adapted for use with loads wherein the power requirements vary as well as where speed requirements vary.
An intelligent processor based estimator is used for estimating future load requirements and can proactively balance power needs with the need to maximize energy efficiency. The system estimates load requirements on prior load and power requirement patterns and uses a load and power estimation feedback loop to provide the required parameters. These parameters could be temporal and spatial based parameters, in addition to physical environment based parameters.
The drive system of the present invention is extremely simple and economical of construction while yet providing highly improved energy efficient operation of such systems in a novel and simple manner.
Current systems driving motive devices like an induction motor on single phase power lines have severely restrictive power characteristics. Initial surge current on the mains of 7 to 10 times the full load current of the motor have been observed. Current systems also present a phase shifted load to mains depending on the load of the motive device. Many electrically powered motive devices are designed for high load currents despite having significantly lower operating loads.
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Present claim is for an increase of the energy efficiency and a decrease of power consumption requirements of drive based systems for motive devices. Claim is for a system that improves the energy and operational characteristics of drive based systems, along with a reduction of the load and power factor of load of the motive device under all conditions of torque and power requirements. As a result of the improvements, increases in the longevity of motive device's operational life are consequent.
One of such applications is for fuel dispenser systems. Traditional Operation of fuel dispenser is indicated in Figure 1.
The Block Schematic of the pump shown if Figure 1, explains the status of the dispenser power requirements.
Status 1.
Fuel is dispensed through the fuel dispensing nozzle. . The pump starts filling up the pipeline from the sump of the fuel. After the fuel fills up the pipe line and builds up pressure, the fuel is diverted through a bypass path within the pump.
In this status power consumed by motor is almost 110% of power required for maximum speed delivery power. As soon as the Nozzle is lifted from its cradle the cradle switch operates and induction motors starts with a surge of 5 to 6 times the full load current rating lasting for 4 to 5cycles.
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Status 2.
Operator then inserts the nozzle in fuel tank of the vehicle and starts delivery. He has three positions for regulating the flow of the fuel. Fuel is delivered at low, middle and high speeds.
If operator chooses lowest delivery rate for smaller vehicle, the Power consumption in low delivery state is 110% and in middle position 105% of that required in maximum delivery rate.
Status 3.
Operator then raises the speed of delivery by increasing the nozzle opening
gradually to full opening.
Power requirement is the lowest when nozzle is opened for maximum
delivery.
Status 4.
Delivery comes closer to the end value (tank may be approaching full status). Operator starts reducing the speed in order to prevent foaming and spilling of fuel. He finally comes to a complete halt. At this point he will be in status 1 position. He returns the nozzle to the cradle and the motor stops. In this status almost 110% of status 3 power is consumed.
Description of block schematic diagram of the fuel dispenser in accordance with this invention is shown in Figure 2.
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Referring to Figure 2, the system consists of lphase input VFD (Variable Frequency Drive) with a built in power factor correction scheme and a standard three phase Induction motor. The motor runs according to a program controlled by a microprocessor controlling the VFD (Variable Frequency Drive). VFD is on as soon as nozzle is lifted.
The microprocessor has built-in intelligence for estimating future load requirements and can proactively balance power needs with the need to maximize energy efficiency. The system estimates load requirements on prior load and power requirement patterns and uses a load and power estimation feedback loop to provide the required parameters. These parameters could be temporal and spatial based parameters, in addition to physical environment based parameters.
Operation of the modified Pump in similar status are as given below.
Status 1.
As soon as the nozzle is lifted from the cradle VFD is ON the Line power is connected to the pump. A half cycle surge will be observed during the charging of the capacitors within the drive. Then motor speed is ramped up (soft start) till it reaches optimum speed and fuel is drawn from the sump at this speed. The special micro-controller based intelligence which controls the drive speed sets raises the speed of the drive initially and later reduces the speed so that minimum power is consumed when the fuel is running in bypass path within the pump after the incoming pipe line fills up.
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In this status consumption of power is only quarter of the Power required in
similar Status 1 in a traditional fuel pump.
The starting power surge created by the drive is negligible.
Status 2
As soon as the delivery starts the fuel delivery indication starts. The speed of the Pump is raised till it reaches optimum speed of the Pump. Speed of the pump is adjusted according to nozzle opening and it is also based on rate of delivery seen on the fuel delivery indicator provided with the dispenser. The optimum delivery speed is adjusted for all the three positions of the nozzle opening. Operator could deliver to smaller vehicles at lower power when he delivers with low delivery position on the nozzle.
The consumption of power is adjusted always for optimum value for low delivery position of the nozzle.
Status 3
If operator demands higher delivery speed by. setting larger opening on the nozzle then the speed of the pump is adjusted according to his choice.
The power consumption rises according to the rate at which the fuel is being
delivered.
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Status 4.
If operator wants to top up the vehicle fuel tank, the speed of the motor is adjusted to reduce the speed of the fuel so that no foaming during delivery of the fuel thus reducing the burden of the operator during topping up operation.
Advantages of the modified Fuel dispenser over the traditional Fuel
dispenser.
In traditional Fuel dispenser
a. As soon as you lift nozzle induction motor draws a large surge current
lasting for 4 to 5 cycles.
b. In the idle mode (cradle off the nozzle no delivery) the motor is
running at full dispensing speed simply circulating the fuel in bypass
path at full speed power consumption in this status is higher than that
required while delivering the fuel.
c. When operator sets three different openings for the nozzle the power
for the pump does not reduce. In fact it remains higher for lower
opening of the fuel delivery nozzle. Excess fuel circulates through
bypass path.
d. Delivering the preset fuel quantity manually and topping up operation
of the fuel tank are difficult as there are only three discrete fuel nozzle
positions. Since fuel is dispensed under full speed even with reduced
nozzle opening foaming of fuel makes operators life difficult.


In modified Fuel dispenser
e. When the operator lifts the cradle no surge current is drawn by motor.
Motor speed is ramped up slowly and kept at optimum level to
prevent excess power during idle mode.
f. When the cradle remains with operator for a long time the drive drops
operating speed. This reduces idle power considerably.
g. Speed of delivery of fuel is decided by the nozzle opening and
intelligence of the processor
h. During topping up of fuel tank, the speed of the motor rises gradually to final speed thus requiring less effort on the part of the operator and reduces consumptions of Power.
Impact of modified fuel dispenser
Significant impact will be seen when the system is working from solar
power or from battery when mains has failed. The intelligence of the pump
senses failure of mains and adjusts speed when large volume delivery is
required to and optimum level such that energy consumed from the battery is
kept at minimum.
Significant reduction in the size of the DC to AC and DC to DC converters
takes place when modified dispenser is used. The traditional induction motor
demands a drive 6 to 7 times the rating otherwise it will stall. lkVA system
requires a rating of 6kVA typically.
Modified drive operates from a lkVA system requires lkVA Inverter or
Converter.
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Typical Power consumption of the system for operating and delivering 200 deliveries in a day from fuel dispenser alone with an average delivery time of 1.5 minute idle time l.Ominutes delivery and 1.5minute idle and 1 minute off time is 15kWHr. The modified system reduces the consumption to 6kWHr and in special circumstances to 2.75kW or lower. The saving per pump is 9kWHr to 12kWHr per day.
The above calculation assumes delivery of 70 liters every 5 minutes on a single pump and total of 14000 liters will delivered during the day.
The system utilizes essentially the same system as the normal pump. Only modifications in the system are electrical in nature therefore can be implemented with ease. The advantages of the system of this invention are
1. Use 208V ac.± 10% 3 phase ac induction motor 60 Hz motor (typically used in USA) is suitable for operating from VFD operating from 230V source. Cost of induction motor essentially does not go up.
2. Intelligent use of drive saves considerable amount of power the reasons for which are given in further part.
3. The cost of UPS system reduces considerably. lkW UPS with adequate back up depending on the power failure duration can support single pump. Battery for the same back time reduces considerably.
4. Even the busiest pump requires 3kWHr solar Panel. If there are 6 best Hrs of Sun 500W panel will support one pump. If pump is delivering only 7000 liters per day then the panel of half the Power will work.
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While considerable emphasis has been placed herein on the particular features of Drive system; the improvisation with regards to it, it will be appreciated that various modifications can be made, and that many changes can be made in the preferred embodiment without departing from the principles of the invention. These and other modifications in the nature of the invention or the preferred embodiments will be apparent to those skilled in the art from the disclosures herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the invention and not as a limitation.
Dated this 23rd day of July 2008.

Mohan Dewan Of R.K.Dewan&Co.
Applicants' Patent Attorney
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