EN15194 compliance

[hoppy]

I've read recently that much more powerful motors can be certified to comply with EN15194 by using the acceleration test . How can this be done when they are pas only with no throttle?

 

[Old_Dave]

How can this be done when they are pas only with no throttle?

Maybe someone sits on the bike and pedals whilst going along the test track ?

 

[flecc]

It is a timed actual riding test, but of course the flaw with torque sensing bikes is that the outcome can depend on the degree of rider input. Here's the test details:

In this test, starting from a standstill one accelerates the bike, and times how long it takes to cover 20 metres. According to EN19154 the power is to be calculated from the formula,

P = 2 x D x D x M/(T x T x T)

where P= power watts, D= 20 metres, M= mass of rider plus bike Kg, T = time secs to cover distance D.

For a bike and me weighing together 100 kilos, a time of 6.9 seconds to cover that 20 metres from a standstill means 244 watts.

 

[Deleted member 4366]

I've read recently that much more powerful motors can be certified to comply with EN15194 by using the acceleration test . How can this be done when they are pas only with no throttle?

You can get a load cell that goes on the pedals and records how much work the rider does, so you can subtract his/her power from the total to calculate the motor power. Extra Energy used these devices in their tests that they used to publish, but I think you have to pay for the test results now as I didn't see the results of the last two group tests.

 

[trex]

Interesting reading from this test report for the Tonaro:


http://www.elebike.cz/down/certificates/PRINCESS.pdf

and another test report for the Moustache:

http://www.moustachebikes.com/dl/test_lundi_26_nuvinci.pdf

For motor power, the report simply says:

Bosch certificate 11/01/2011. No need for real test.