Full analysis of Baolai Automobile CAN Bus
The Baolai car uses two CAN buses, namely the CAN bus of the drive system and the CAN bus of the body system. These two buses can fully meet the definition of ISO. The drive system CAN bus, with a communication rate of 500 kbps, is called high-speed CAN, and its connection target is the control unit of the vehicle power and transmission mechanism. Automotive engine control unit, automatic transmission control unit, ABS control unit, airbag control unit, etc. The body system CAN bus, which has a communication speed of 100 kbps, is called a low-speed CAN or a comfort system CAN, and its connection object is a central controller, four door controllers, and the like. In addition, an important feature of the Baolai car is the introduction of the concept of network management in the CAN of the body system. This is very suitable for event-triggered data communication. This article refers to the address: http:// The high-speed CAN for the drive system and the low-speed CAN for the body system are two independent buses, but from a resource sharing point of view, it is better to have a bridge between them so that the body system can also be driven. System information. Of course, considering the traditional way of thinking, just adding a few wires seems to solve the problem. However, from the actual development, that is, on the existing controller hardware, adding even a signal pin will lead to hardware redesign, often cost and progress are not allowed to do so. In order to obtain the information of the other system without any changes in the hardware, the Baolai car used the gateway-J533 to complete this task, and the gateway of the Baolai car was “parasitic†in the instrument cluster. The typical control systems associated with the drive system on the Polaris are electronically controlled fuel injection systems, automatic transmission systems, anti-lock braking systems (ABS), and airbag systems. Since the real-time requirements of each control unit are different due to different data update rates and control cycles, in order to meet the real-time requirements of each subsystem, sharing with common data, such as engine speed, wheel speed, and accelerator pedal Position, etc. If the 4-cylinder gasoline engine of the Baolai car is running at 4000r/min, the electronic control unit controls the interval between the two injections to be 6ms, wherein the injection duration is 30 degrees crank angle (1ms), within the remaining 5ms. A series of processes such as speed measurement, oil quantity measurement, A/D conversion, working condition calculation, and actuator control must be completed. This means that data transmission and reception must be completed within 1ms to meet the real-time requirements of gasoline electrical control. This requires that the data exchange network is based on the priority competition mode, and has a very high communication rate. The Baolai car adopts the CAN bus to meet these requirements. In addition to the drive system, the body system CAN is also a major controller area network. Its main connection objects are: central controller, 4 door controllers, memory modules and other components. The control objects of the body system are mainly the centralized control locks on the four doors, the window, the trunk lock, the rear view mirror and the interior ceiling light. In the case of a remote control function, it also includes control of the reception of remote control signals and other anti-theft systems.
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