Kinetic energy recovery is a familiar term in new energy vehicles. Currently, almost all electric vehicles and plug-in hybrid vehicles on the market have kinetic energy recovery systems. Kinetic energy recovery has become a standard feature of electric vehicles.
What is kinetic energy recovery?
Kinetic energy recovery refers primarily to the process of regenerative braking (Regenerative Brakes) in electric vehicles, where electric motors are used to recover kinetic energy for slowing down and stopping.
Traditional hydraulic braking systems (typically disc brakes or drum brakes) waste energy by converting the car's kinetic energy into heat energy through friction during braking. While effective in reducing the vehicle's speed, the heat generated is dissipated as waste.
In contrast, regenerative braking allows the braking system to capture kinetic energy and transfer it back to the car's battery. It is estimated that most hybrid vehicles can recover up to 90% of the energy during regenerative braking, effectively charging the battery in reverse through the motor. This capability helps to extend the range of electric vehicles and plug-in hybrid vehicles.
How the kinetic energy recovery system works?
The principle of regenerative braking involves harnessing the kinetic energy from the vehicle's coasting motion to drive the motor in reverse. Similar to a generator, it converts kinetic energy into electrical energy, which is then transferred to the battery to extend the vehicle's range.
Some hybrid and electric vehicles feature paddles on the steering wheel that activate regenerative braking. However, in most vehicles equipped with regenerative braking systems, this process starts automatically.
Single-pedal mode
Some car systems can engage regenerative braking during coasting, known as single-pedal mode. The principle is that when the vehicle releases the accelerator pedal, the regenerative braking system activates, recovering kinetic energy while gradually reducing speed. During this phase, the drive motor primarily completes energy recovery. Its forward rotation propels the vehicle, while its reverse rotation functions as a generator to store energy. This approach enables the vehicle to maximize energy recovery while driving, thereby enhancing range, minimizing the need for frequent and intense braking, reducing hydraulic braking strain and driver workload, and potentially extending the lifespan of brake pads.
Advantages of regenerative braking
Improving fuel economy and electric vehicle range: Hydraulic brakes dissipate kinetic energy as heat, resulting in energy loss. Regenerative braking channels this energy into the car's battery, thereby increasing mileage. In hybrid models, directing more power to the battery pack can extend pure electric driving time and reduce reliance on the internal combustion engine.
Reducing brake wear: By using regenerative braking more frequently, there's less need for traditional friction brakes. This reduces the frequency of visits to the service center for brake pad replacements.
Enabling one-pedal driving and reducing driver effort: Regenerative braking systems enable one-pedal driving, particularly beneficial in urban settings. Drivers no longer need to alternate between the accelerator and brake pedals repeatedly, simplifying the driving experience.
Disadvantages of regenerative braking
Driving habits need to adapt: Regenerative braking takes time for drivers to adapt and may cause road traffic risks. Related news has been reported many times before.
Weaken the driver's vigilance and sense of responsibility: Regenerative braking is an automatic driving assistance system. One of its persistent negative effects is that when drivers begin to rely more and more on technology to do the braking for them, they lose their sense of responsibility, which can eventually lead to dangerous situations.
Less reliable at high speeds: Friction braking can stop the vehicle quickly and reliably. In emergency situations, when the car must stop quickly and completely, regenerative braking is not as good as friction braking. This is why hybrid and electric vehicles often use both braking systems.
Not much benefit at low speeds: When using regenerative braking at low speeds in the city, the energy generated is not enough to have any meaningful impact on the car's range.
Overall, it can be said that the benefits of regenerative braking outweigh these disadvantages. We should embrace it, this technology will become more and more mature, and continue to bring convenience to people's travel life!