ERS - PAD : Pedal Assistance Bicycles
ERS development : Twisting system for electric assistance bicycles ERS allows an effort profit when starting of 25%.
Every rider knows it, the first pedal turn is often the hardest, because two physical phenomena come to thwart his efforts. First, the friction exerted between the bicycle and the ground. Then, the inertia opposed to any body which wants to move it. Pedal assistance bicycles currently sold look like more to a motorcycle than a bicycle. 95% of the electric bikes are made in China (2005 production : 15 million bikes, 2010 forecasts : 30 million), 80% are without assistance, and are equipped with a motorcycle frame. The weight corresponds to the specifications, and is generally the double of a standard bicycle. On PAS bikes, the effort required (taking into consideration the difference in weight) when starting is 25% superior to a bicycle. System ERS allows an effort profit of 25% when starting your bicycle. When you pedal, the pedal assistance causes jolts transmitted by the system when you start the motor. This is accentuated when you rise a hill. Indeed, the motor only helps you when you press on the pedals, since its starts after the couple sensor has informed the calculator of the effort produced by the rider. Therefore, when the pedals are close to the vertical position, the motor does not help you any more, you then feel very awkward jolts, which break the pedalling rythm, and request inoppotunately the motor assistance.
Combination between ERS and Twisting brings : - more pedalling fluidity (reduction of the dead point) - a better distribution of the effort, optimizing the work of the sensor (number of turns and couple sensor).
Couple Sensor Development in cooperation with WHEELTOP company Twisting type produced by Wheeltop When pedalling, this intelligent system detects any movement (from the first crank turn), and measures the number of rotations. It starts the motor according to a progressive assistance : the more you press on the pedals, the more you request the assistance. The sensor perceives information emitted on the opening/closing levels of the two notched parts. The couple transmitted by the effort of pedalling compresses the springs leading to a small move between the notched parts creating the opening or closing of the lights. The more the couple of transmission is important, The more the springs are compressed, The more the luminous passing over is reduced TThe sensor requires more or less the motor energy.
Comparison between ERS and traditional system.
Concretely, it means that, instead of providing a series of efforts with jolts, ERS makes it possible to start more easily and then simply ride your PAS bicycle providing a flexible and regular effort. Couple Sensor
The PAS standard imposes a whole turn of the crank before starting the motor, that is to say, a high couple requiring a strong electric assistance reducing autonomy. The combination of ERS ant Twisting system smoothes the couple, thus requires less assistance, leads to an improvement in comfort, thanks to a better variation of the request for electric output, and increases autonomy. |
Electrical Assistance 
