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The eco marathon is a competition of the mileage.
It manufactures the mileage car of the oneseater and it is a competing race in the mileage in the circuit and so on.
Generally, the running distance is about 20 - 30 km and the specified time is set for the average speed to become 25 - 30 km/h.
It converts a record from consumed fuel and the mileage to the 1 liter mileage.
For example, it is 2000km/L.
It introduces some points which influence mileage.
These are management of driving, air resistance, rolling resistance of the tire and thermal efficiency of the engine.
| About management of driving |
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When running, to be at high speed more than necessary,
the air resistance becomes big and the mileage becomes bad.
Also, the steering control, is important, too.The mileage becomes bad
because the braking operation increases when doing steering control more
than necessary. |
| About air resistance |
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The driving speed, the car-body shape, the area of the
front and so on influence roughly.
Therefore, the car-body shape is desirable to make a smooth shape like
the streamline shape. And to make the area of the front small boundlessly
is an ideal.
The body of Fancy Carroll Team ( Japan ) is small area of the front and
smooth. I always admire one. |
| About rolling resistance of the tire |
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As for the eco marathon, the driving speed is lower
than usual car. Therefore, the rolling resistance tends to become bigger
than the air resistance. But, it depends on the mileage car.
The rolling resistance influences the material and the structure, the
air pressure of the tire and the vehicle weight.
It is difficult for us to improve the basic performance of the tire.
Howevere are trying to be able to utilize the basic performance of the
tire to the full.
For example, it is the management of the air pre, wssure, the adjustment
of the wheel balance, the selection of rim and the tube and so on.
Also, the weight to become light as much as possible, the drivers are
managing weight. |
| About thermal efficiency |
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The engine changes heat energy into the work.The big
work can be gotten by little fuel if the thermal efficiency is high.
The thermal efficiency influences compression ratio, excess air ratio,
fuel-injection-timing or ignition-timing, engine speed and so on roughly.
Test, adjustment and improvement are very important. Also, it is important
to adjust a gear atio to utilize the engine speed of the high efficiency
actively, too. |
These 4 points are not only eco marathon. It is common to all vehicles.
- It checks the air pressure of the tire.
- It doesn't load with the luggage which doesn't have need.
- It is careful of the acceleration, the braking, the handle ring.
- It removes the roof carrier not to use.
How is it? The mileage may possibly improve. |
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