What is the pedal assist system?
The pedal assist system, or Pedal Assist System (PAS), is the technology that allows electric bicycles to provide support to the cyclist while pedaling. Unlike electric motorcycles, where pedaling is not necessary, e-bikes require the cyclist to pedal for the motor to provide assistance. This system is designed to make pedaling smoother and less demanding, especially on hilly terrain or long journeys. The electric motor of the bike does not completely replace the cyclist's effort but complements it, reducing the force you need to apply while pedaling and making the ride easier and more comfortable.Main components of the pedal assist system
To understand how a pedal assist system works in an electric bike, it is important to know the main components that make it up. These are:Electric motor
It is the heart of the electric bike, and its function is to provide the additional boost when needed. Depending on the type of bike, the motor can be located in the rear wheel, front wheel, or the bottom bracket (central motor). The motor activates when it detects that the cyclist is pedaling and adjusts the level of assistance based on the set configuration.Pedal sensor
This sensor is crucial for the functioning of the assistance system. There are two main types: cadence sensors and torque sensors. Cadence sensors detect if the cyclist is pedaling and activate the motor when the pedals start moving. In contrast, torque sensors measure the force being applied while pedaling, allowing for a more precise adjustment of the assistance level based on the effort the cyclist is making.Battery
The battery provides the necessary energy for the motor to function. Electric bike batteries are usually lithium-ion and can have different capacities, which determine the bike's range. The location of the battery can also vary, but it is typically found in the frame or at the rear of the bike.Control unit or display
Through this unit, the cyclist can select the level of assistance they want. Most electric bikes have several levels of assistance, ranging from minimal support to maximum boost. This allows the cyclist to adjust the motor according to the terrain conditions or their level of fatigue.How do pedal assist systems work?
The operation of the pedal assist system in an electric bike is relatively simple, but it is based on advanced technology that coordinates the motor, sensors, and battery to provide an optimal pedaling experience.1. Motor activation
When the cyclist starts pedaling, the pedal sensor detects the movement or the force applied (depending on whether it is a cadence or torque sensor) and sends a signal to the control unit to activate the motor. This motor provides automatic and proportional assistance, making pedaling smoother and less exhausting.2. Selection of assistance level
The cyclist has the option to choose the level of assistance via the control unit located on the handlebars. The lower levels offer a light boost, ideal for flat terrain or when wanting to exercise more, while the higher levels provide greater assistance, perfect for climbing steep hills or covering long distances with less effort.3. Distribution of assistance
The motor automatically adjusts the amount of assistance based on the selected level and the information it receives from the sensors. For example, if the bike is equipped with a torque sensor, the motor will provide more assistance when it detects that the cyclist is pedaling harder, such as when climbing a hill. In this way, the pedal assistance adapts to the terrain conditions and the cyclist's needs.4. Motor deactivation
When the cyclist stops pedaling or reaches the maximum speed allowed for the motor (generally between 25 km/h and 28 km/h, depending on the legislation of each country), the motor automatically deactivates. Thus, the bike relies solely on the cyclist's effort again.Advantages of the pedal assist system
The pedal assist system of electric bikes offers multiple advantages, which have made these bikes a very popular option for both urban commuting and recreational cyclists. Some of the main advantages are:- Less physical effort: The pedal assistance reduces the amount of effort you need to apply, making electric bikes ideal for people of all ages and fitness levels.
- Greater range on long trips: Thanks to the motor's support, you can cover longer distances without getting as fatigued as on a traditional bike.
- Ideal for difficult terrains: Climbing hills or facing strong winds is much easier with the additional boost provided by the motor.
- Personalized adjustment: The different levels of assistance allow the cyclist to customize their pedaling experience based on their needs and the terrain they are traveling on.