What does PCM mean in cars?

ECU body computer (on-board computer) PCM engine control module, in which all other modules in the car communicate with ECU.

PCM will receive sensor signals, control fuel supply, gas distribution (electronic throttle), fuel injection and ignition timing, and intake pressure adjustment through complex calculation, and determine the compensation control coefficient of the engine according to temperature, load, knock and combustion conditions.

Introduction to PCM

Nowadays, digital transmission systems all adopt pulse code modulation system.

PCM was not originally used to transmit computer data, but to establish a trunk between switches, not just to transmit telephone signals. There are two standards for PCM, E 1 and T 1.

China adopts the European E 1 standard. The rate of T 1 is 1.544mbit/s, and the rate of e 1 is 2.048mbit/s?

PCM: Phase change memory (PCM) is a new memory chip developed by IBM, which is expected to replace flash memory and HDD.

In optical fiber communication system, binary optical pulse "0" code and "1" code are transmitted in optical fiber, which are generated by switching modulation of light source by binary digital signal. Digital signals are generated by sampling, quantizing and coding continuously changing analog signals, which is called PCM (pulse code modulation), that is, pulse code modulation. This electrical digital signal is called digital baseband signal, which is generated by PCM electrical terminal.

PCM can provide users with a variety of services, from 2M to 155M, as well as voice, image transmission, distance education and other services. It is especially suitable for users who need higher data transmission rate and higher bandwidth. ?