New energy vehicles are not equipped with fuel engines, so how do they achieve vacuum-assisted braking during braking? New energy vehicles mainly achieve brake assist through two methods:
The first method is to use an electric vacuum booster braking system. This system uses an electric vacuum pump to generate a vacuum source to assist braking. This method is not only widely used in new energy vehicles, but also in hybrid and traditional power vehicles.
The second method is the electronic power-assisted braking system. This system directly drives the brake pump through the operation of the motor without the need for vacuum assistance. Although this type of brake assist method is currently less used and the technology is not yet mature, it can effectively avoid the safety hazard of the vacuum-assisted braking system failing after the engine is turned off. This undoubtedly points the way for future technological development and is also the most suitable brake assist system for new energy vehicles.
In new energy vehicles, the electric vacuum boost system is the mainstream brake boost method. It is mainly composed of a vacuum pump, a vacuum tank, a vacuum pump controller (later integrated into the VCU vehicle controller), and the same vacuum booster and 12V power supply as traditional vehicles.
【1】Electric vacuum pump
A vacuum pump is a device or equipment that extracts air from a container through mechanical, physical or chemical methods to create a vacuum. Simply put, it is a device used to improve, generate and maintain a vacuum in a closed space. In automobiles, an electric vacuum pump as shown in the figure below is usually used to achieve this function.
【2】Vacuum tank
The vacuum tank is used to store vacuum, sense the vacuum degree through the vacuum pressure sensor and send the signal to the vacuum pump controller, as shown in the figure below.
【3】 Vacuum pump controller
The vacuum pump controller is the core component of the electric vacuum system. The vacuum pump controller controls the operation of the vacuum pump according to the signal sent by the vacuum pressure sensor of the vacuum tank, as shown in the figure below.
When the driver starts the car, the vehicle power is turned on and the controller starts to perform a system self-check. If the vacuum degree in the vacuum tank is detected to be lower than the set value, the vacuum pressure sensor in the vacuum tank will send the corresponding voltage signal to the controller. Then, the controller will control the electric vacuum pump to start working to increase the vacuum degree in the tank. When the vacuum degree in the tank reaches the set value, the sensor will send a signal to the controller again, and the controller will control the vacuum pump to stop working. If the vacuum degree in the tank drops below the set value due to braking operation, the electric vacuum pump will start again and work in a cycle to ensure the normal operation of the brake booster system.
Post time: Dec-18-2024