Domov Aktualno Obvestila Development and testing of the cargo bike with electrically assisted drive system

Development and testing of the cargo bike with electrically assisted drive system

The development of the cargo PEDELEC was aimed at the following three main targets:
A – High cargo capability teamed with save driving;
B – Good usability in all circumstances regarding pedalling and push operation;
C – Sufficient electric assistance (gradeability, range)

A: High cargo capability teamed with save driving
The load fixture should be as low as possible in order to give a low centre of gravity (COG). Test riding with the tilting cargo trike developed in the former project enPorter has shown that steering gets difficult with high cargo fixtures and also with steered loads in front of the vehicle. Based on existing experiences and questionnaire results of online surveys the CESLA cargo bike was constructed.

B: Good usability in all circumstances regarding pedalling and push operation
Most responsible for the usability of the bicycle is the geometry. A balanced COG is of prime importance. The CESLA cargo bike has realised it with the two racks – on front and rear. The frame fixed racks are ensuring good stability.
The 20 inch wheels offer an optimum suitability for carrying loads. The stability is very high and the load fixture is situated on a low position with an optimal COG. Due to the small wheels the transmission of propulsion power is higher for moving a bicycle with heavy loads. A long wheel base ensures enough space while carrying loads and pedalling.

C: Sufficient electric assistance without discriminating the first two targets
The use of a front hub motor built for larger tires (26 inch) in the 20 inch front wheel reducing the top speed is beneficial regarding the gradeability. This is important especially while carrying heavy loads. An internal synchronisation helps to reduce the number of leads to the motor. We chose a 20” direct drive in the beginning avoiding gears and costly multi pole solutions. Using a DIY-solution also allows the use of a 20 Ah 36V LiFePO4 battery.

 

CESLA_D-3_1_cargo_bike_design

 

CESLA_D-3_1_cargo_bike_testing

 

 

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