Electric vehicles are a type of new energy vehicles.

Introduction: What is the role of the vacuum pump in electric vehicles? Introduction to the vacuum pump in electric vehicles

Electric vehicles are a type of new energy vehicle, and many netizens express that electric vehicles are the ultimate goal of automotive development, as they have significant advantages over other types of vehicles. Many consumers are aware of these performance aspects of electric vehicles, but few know about the internal working principles, such as what the vacuum pump in electric vehicles does. Today, I will introduce its role.

Introduction to the vacuum pump in electric vehicles: Electric vehicles

The vacuum assist effect of the braking system is related to the driving safety of the vehicle. In the automotive brake assist system, if the vacuum booster cannot obtain vacuum or the vacuum obtained is insufficient, it will lead to poor assist effect of the braking system. The electric vacuum pump can monitor the vacuum level changes in the booster through a vacuum sensor, ensuring that the driver can provide sufficient assist effect under various working conditions.

Electric vehicles are driven by motors, eliminating the traditional engine, thus losing the vacuum source, which means they cannot provide vacuum assistance to the vehicle's brake master cylinder. The electric vacuum assist pump was created to compensate for this deficiency. It uses the onboard power supply to drive the motor on the pump body to create piston movement, thereby generating vacuum, providing a unique and reliable vacuum source for the hydraulic brake systems of various models such as electric vehicles, hybrid vehicles, electric sightseeing cars, and electric utility vehicles, effectively improving the overall braking performance of the vehicle.

Introduction to the vacuum pump in electric vehicles: Function

The function of the vacuum pump is to generate negative pressure, thereby increasing braking force.       The automotive generator vacuum pump, also known as the booster pump, is an assist device for the brake system and steering system. A vacuum pump, as the name suggests, is used to create vacuum. Generally, small cars use hydraulic assisted brakes, while large trucks or buses typically use pneumatic assisted brakes.  

The vacuum pump of the automotive generator is generally an oil pump, meaning that the vacuum pump core rotates together with the generator shaft, continuously sucking and pumping oil to create negative pressure inside the vacuum pump housing, which is vacuum.  

Introduction to the vacuum pump in electric vehicles: Principle

1. The vacuum assist effect depends on the relative vacuum level, that is, the ratio of the negative pressure value inside the assist cylinder to the external atmospheric pressure value. It is recommended to simultaneously collect the pressure value inside the cylinder and the external atmospheric pressure, with the start-stop threshold calibrated to two relative vacuum values;

2. The vacuum pump's ability to create vacuum is also based on relative vacuum level, that is, the maximum vacuum level is a percentage of the external atmospheric pressure. The external atmospheric pressure decreases with increasing altitude, and correspondingly, the absolute vacuum level inside the cylinder also decreases, which will weaken the assist effect;

3. In terms of control strategy, if the assist cylinder is small, it is recommended that the vacuum pump's startup trigger be directly associated with the brake signal, and only stop using the calibrated threshold trigger to improve the assist effect during continuous braking;

4. When applying electric vacuum pumps in electric vehicles, it should be considered that there may be frequent start-stop applications, and there may be backflow phenomena at the exhaust port during the moment of shutdown. Measures should be taken to prevent water and dust from being sucked in.