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2.8.2 body controller (BCM)
(1) Overview of the body controller (BCM), also known as the body computer. In vehicle engineering, it refers to the electronic control unit (ECU) for controlling the body's electrical system. It is one of the important part of the car.
Common functions of body controller include controlling electric windows, electric rearview mirrors, air conditioners, headlights, steering lights, anti -theft lock systems, central control locks, frost devices, etc. The body controller can be connected to other vehicle ECUs through the bus .
(2) The important task of the body controller is to simplify the operation and reduce the manual operation of the driver, so as not to disperse the attention of the occupant. The car body control system includes car safety, comfort control and information communication system, which is mainly used to enhance the safety, comfort and convenience of the car.
① Enhance car safety: airbags, safety belts, central anti -theft door locks;
② Enhance car comfort: adaptive air conditioners, seat control;
③ Enhance the convenience of automobiles: automatic car windows, electric door locks, electric rearview mirrors, electric vehicle roofs (sunroof), etc., and power management systems that meet the needs of various electricity equipment. The body controller also has the functions of connecting with the vehicle and coordinating the electronic control units of each part of the car. The comprehensive display system, driver information system, navigation system, computer network of driver information systems, driver information systems, navigation systems, and computer networks that connect a large number of computers, sensors and traffic management service systems Systems, status monitoring and fault diagnosis systems.
(3) Function
① Receive the information input of the sensor or other devices, and transform the input information to the signal that the input can be received.
② Storage, computing, analysis processing information. Analyze the program used for the output value, store the characteristics of the characteristics of the model, the data in the operation (with the deposit), and the storage fault information.
③ Computing analysis. Find the execution command data according to the information parameters, compare the input information with the standard value, and investigate the failure.
④ Output execution command. Transform the weak signal into the execution command, output failure information, and self -correct.
(4) Component part
① Enter the circuit. There are two types of sensor signals entering the body controller: one is an analog signal; the other is a digital signal. The type of signal is different, and the processing methods after entering the body controller are not the same. After input the body controller from the signal output of the sensor, first input the circuit, the input circuit converts the analog signal and digital signal into a suitable level signal and input the microcompet.
② Micro controller. The main function of the microcontroller is to calculate the signal and data sent by various sensors according to the needs of the body control, and send the processing results to the output circuit;
③ Output circuit. Because the microcontroller outputs a digital signal with low voltage, this signal generally cannot directly drive the execution of the component, and the function of the output circuit is to transform the digital signal output by the microcontroller into an input signal of executable components.
There are many electric equipment in the automotive circuit connecting the wires of different colors, and the most indispensable is the fuse. The fuse is a habit name, which is called melting wire in the national standard. The role of fuse is to protect the circuit (line) and electric equipment, and install it in the fuse.
Automotive fuse is a type of current fuse. When the circuit current exceeds 2 times the rated current of the fuse, it will melt in a few seconds to protect the circuit. 

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