RECUPERATIVE POWER TRANSMISSION SYSTEM = SAVING FUEL SYSTEM

Energy saving can be provided by:

• CONVERTIBLE ACCUMULATING BRAKING ENERGY instead of nonconvertible change of moving energy into the heat lost to the surroundings by friction breaks

• USING ENGINE OF THE LOWEST POSSIBLE POWER WORKING IN OPTIMUM LOAD instead of using the engine of the highest possible power; it comes from the car maximum requirements; it works all the time in low load conditions because of high power.

Such possibilities are provided by hybrid drive if its technical parameters correspond to the requirements of car exploitation. It is necessary to make conceptions’ modification of the existing hybrid drive schemes. This modification consists of assurance of the possibility of transfer of high power energy stream between wheels and accumulator; small quantity of energy accumulation is allowed. Such system of recovery (recuperation) breaking energy - I have named RECUPERATIVE DRIVE.

Using the recuperative drive capacity of an accumulator is sufficient for realization of big instantaneous stream of giving up and consuming energy; complete braking using friction brakes is not needed (the friction brakes remain in the car as an emergency brake). The capacity of accumulators in the system allows for instantaneous compensation of power demand in the wheels so that while the combustion engine is working in constant conditions - in the area of its highest efficiency - power can be freely regulated. Based on analysis which has been carried through the years I infer that such possibilities can be assured only by a hybrid – diesel-hydraulic system.

Special software “Recuperative Drive” has been created for the verification and modelling of the operation of the recuperative hybrid – diesel-hydraulic drive.

Pre-prototype car, based on VW Polo motor – car body, has been built thanks to Tadeusz Szewczyk who financed the researches. Driving and pre-prototype tests have confirmed right assumptions of the project.

During the test drive the friction breaks were not used at all. The applied breaks were in recovery system with pump-engine of driving system.

We hope that you found this technical design interesting. The pre-prototype is at Tadeusz Szewczyk’s firm; its short specification you can find below and it is ready to be presented to you.

Leon M. Kołodziejczyk
Tadeusz Szewczyk

The modulus of energy recovery is a parameter which evaluates the system of recuperative drive. The modulus of energy recovery is to retrieve braking energy for reuse (L_ham) and to utilize energy produced by car drive system (L_nap) ratio: ρ = L_ham / L_nap.

The pictures below show driven distance of 2300m:

During highway ride – without any accelerations and braking;

stopping without using brakes:

L_ham = 0 kJ

In this case propulsion power was:

L_nap=2149 kJ

and the ratio of energy recovery was:

ρ=0

During driving in the city - with many stops, with acceleration and braking the advantages were as follows:

L_nap = 3238 kJ

L_ham = 1157 kJ

(the recovered braking energy L_ham is spent for acceleration of the car).

The ratio of energy recovery was

ρ=35%

Energy consumption for acceleration the car during “city” driving was:

- Without energy recovery: L_nap=3238kJ
- With energy recovery: L_nap=3238-1157=2082kJ, circa the same amount as during “highway ride” type driving, which is2149kJ

VW POLO CAR TESTS WITH RECUPERATIVE DRIVE

The tests were carried out on 13/06, 26/07 and 01/08/06 on the suburbs of Legionowo. Speed profile of city driving and road driving are shown in the next picture. The test car was equipped with a measurement system of fuel consumption.

<- Test car during test.

The results of tests are shown in a table below:

> THE FUEL CONSUMPTION OF THE VW Polo 1,4 comparative car has increased from 6,4 1/100km (factory data) in road running to 13,2 1/100km in city running

> THE FUEL CONSUMPTION IN THE CAR WITH RECUPERATIVE DRIVE is almost the same during highway and city driving (7…8, 5 1/100km); and is approximately the same as during road driving

During the test, FRICTION BRAKES WERE NOT USED. Braking was performed in recovery system with the support of pump-engine driving system
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Fuel consumption in pre-prototype tests DURING ROAD RUNNING AND MODELLED CITY RUNNING WAS ALMOST THE SAME
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During the city running pre-prototype VW Polo car consumes ALMOST 2 TIMES LESS fuel than the same car equipped with factory engine
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THE TEST RESULTS GIVE POSITIVE FEEDBACK OF PRE-PROTOTYPE RECUPERATIVE DRIVE SYSTEM although the method of the test was simplified and hence imprecise because of investing possibilities

The pre-prototype car with recuperative drive is in Tadeusz Szewczyk firm and it is ready to be presented to you. If you would like to see it and have more information concerning the tests and researches or practical realization, please contact us and attend our presentation.