casainho said:
Proposal for validating measured human power
1. by now, I think we trust well on the measurements done by TSDZ2 for battery(motor) current and battery voltage. I did calibrate with a good multimeter that measurements and other did validate after.
2. we could try to compare the battery power usage VERSUS human power usage to move a bicycle on the same external conditions: same ground inclination, same wind, same speed, same gear, etc.
Can anyone do some repetitive measurements like this:
1. pedal in medium inclination hill to achieve a constant wheel speed of like 10 kms/h (with TSDZ2 motor disabled) and take note of the measured human power on LCD3.
2. using walk assist and not pedaling, configure a PWM duty-cycle value in a way to achieve a constant wheel speed of 10 kms/h. Take note of the measured battery(motor) power on LCD3.
3. Repeat for different motor power values like: 100, 200, 400, 600 and 800 watts.
As you said, it is best to wait with further testing until we have improved the code. But just wanted to mention that your proposal to validate the human power calculation is very good. For anyone wondering, this is a relative test and the absolute values do not matter. What matters is the relative value of human power and motor power during the same conditions.
* Replicate all runs at same start and end points
* Same inclination throughout the testing track
* Same speed, all tests
* Low and preferably no steering input
* Same user, all tests
* Same bike, all tests
* Needs to be tested at certain motor power levels!
* Needs to be tested at different user inputs but same human power: one test using high torque with low cadence, another using medium torque with medium cadence and lastly using low torque with high cadence
* Special development firmware that can maybe use constant PWM motor control at higher speeds during validation
Walk Assist only works at speeds below 8 km/h or around 5 mph. Above this speed it is disabled and if trying to enable Walk Assist over this speed Cruise will be activated, if it is enabled in the Configuration Menu.
thineight said:
In case you need to collect sensor data under defined load from the users (as buba started about a week ago), please try to sketch a procedure/guideline for a standard test (that can be repeatable) and we will collect our measurements. :wink:
Great support! When it is time to do some testing and validation a procedure/guideline will be made! The more data we get the better it usually gets!