Automobile engines, the history of the development of electronic control systems have gone through what stages, they are?

Probably can be divided into four stages, the first stage for the use of electronic ignition devices before 1971, the second stage for the 1974 ~ 1982, to integrated circuits and 16-bit microprocessors used in the car, the third stage for the 1982 ~ 1990, microprocessors in the automotive applications are becoming increasingly reliable and mature, and to the direction of the development of the fourth stage for the development of the fourth stage for the development of automobile electronics from the 2005 began to enter the automotive electronics technology, there are communication systems, multiplexing systems, etc. began to be applied