1) the first stage: single heating stage 1925, the United States first used the cooling water of automobile engines to provide heat through heaters. It was not until 1927 that a relatively complete heating system consisting of heaters, fans and air filters appeared.
2) The second stage: single refrigeration stage 1939, in which Packard Automobile Company of the United States installed mechanical refrigeration and cooling air conditioning devices on automobiles for the first time. This single refrigeration device only has the function of refrigeration. After World War II, the rapid development of American economy promoted the rapid development of this kind of automobile with single refrigeration device.
3) The third stage: heating and cooling integration stage. 1954, General Motors Corporation of the United States took the lead in installing an integrated air conditioner with cooling and heating functions on cars. With the development of air conditioning technology, integrated air conditioning basically has the functions of refrigeration, heating, dehumidification, ventilation, filtration, defrosting and so on. At present, this kind of air conditioner is still widely used in economical cars.
4) The fourth stage: automatic control stage. The automobile air conditioner with integrated cooling and heating needs manual operation, which obviously increases the workload of the driver and the control quality is not ideal. Therefore, since the appearance of automobile air conditioning with integrated cooling and heating, people have begun to study automatic control of automobile air conditioning.
5) The fifth stage: microcomputer control stage: 1973, General Motors Corporation of the United States and Isuzu Automobile Company of Japan jointly developed microcomputer-controlled automobile air conditioners. 1977, microcomputer-controlled automobile air conditioners were installed in their own cars.
Compared with the automatic air conditioner controlled by analog controller, the automobile air conditioner controlled by microcomputer has the functions of digital display, refrigeration, heating and ventilation, intelligent fault diagnosis and so on. The automatic air conditioning system of luxury car and the body computer system form a local area network, and the computer can automatically control the air conditioning system according to the environmental conditions inside and outside the car.
Extended data
The development of automobile air conditioning technology in China has roughly gone through three stages:
The first stage is from the early 1960s to the late 1970s, which mainly uses the heat generated by exhaust gas from automobile engines or cooling circulating water to heat the interior of automobiles.
The second stage was from the early 1980s to the early 1990s. In the early 1980s, China purchased automobile air conditioning systems with refrigeration function from Japan and assembled them on cars and luxury buses such as Hongqi and Shanghai.
In the middle and late 1980s, FAW in China and automobile factories in Shanghai, Beijing, Guangzhou and Foshan introduced advanced air-conditioning production lines and technologies from Japan and Germany to produce air-conditioning systems for large and medium-sized buses, light cars and cars.
In the third stage, since the mid-1990s, a number of domestic automobile air-conditioning manufacturers have introduced advanced production technologies and production lines such as compressors, condensers and evaporators from abroad, and China's automobile air-conditioning technology is close to the world's advanced level.