In the rapidly changing global market and technology, my country's parking market faces a serious imbalance between the supply and demand of parking spaces, and the market for parking spaces continues to expand. Against this background, three-dimensional garages, which have obvious advantages in cost and space utilization compared with traditional parking spaces, have become the first choice for alternatives, and there is a huge alternative space in the industry. Three-dimensional garage is a kind of mechanical parking equipment. It provides an effective solution to solve the problem that the current dynamic traffic is developed, the static traffic is backward, and is limited by the rigid constraints of land resources, and the serious shortage of parking facilities. In the near future, the three-dimensional parking market will Ushered in a new round of outbreak. The requirements for smart parking lots are getting higher and higher. Sensors are used for data collection and monitoring of smart parking systems. They can measure the length and height of the vehicle, and select the appropriate parking space. It can also determine the vehicle is in the process of parking through distance comparison. Whether there are abnormal displacements, unnecessary collisions or scratches can also be avoided.

In developed countries, the three-dimensional garage has been a mature product with a history of more than 100 years of development, but in China, it is still a new thing and a new industry, with a low penetration rate, and the public does not know much about it. At present, there are 9 major types of three-dimensional garages on the market, including lifting and transversal type, vertical circulation type, simple lifting type, vertical lifting type, plane moving type, roadway stacking type, multi-layer circulation type and so on. Lifting and traversing parking equipment is the most common type. It is a three-dimensional garage where the car board is lifted or traversed to access the vehicle. Generally, it is a quasi-unmanned method, that is, a way to move the car after a person leaves the equipment. Hanliwell's optoelectronic, inductive, range-finding sensors, and vertical limit switches are used in three-dimensional garages to improve vehicle mobility and solve parking problems.