Embedded front and back system and its control method

Abstract

The invention discloses an embedded foreground / background system. The embedded foreground / background system comprises an input module, an output module and a control module, wherein the input module is used for receiving an input signal of an Nth cycle period; the output module is used for outputting an output signal generated by the control module in an (N-1)th cycle period in the Nth cycle period; the control module is used for calculating an output signal of the Nth cycle period according to the input signal of the Nth cycle period; in the first cycle period, the input module is controlled to receive an input signal of a first cycle period, and the output module is controlled to stop outputting; in an (N+1)th cycle period, the output module is controlled to output the output signal of the Nth cycle period, and the input module is controlled to receive an input signal of the (N+1)th cycle period and generate an output signal of the (N+1)th cycle period. By adopting the embedded foreground / background system, the stability of the running time of the output module can be effectively ensured, and the accuracy of the CAN (Controller Area Network) bus communication time is ensured. The invention further discloses a control method of the embedded foreground / background system.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to an embedded front and back system and a control method for the embedded front and back system. Background technique [0002] In the control system that does not use the operating system, the embedded front and back system is a commonly used real-time control system. Embedded front-end and back-end systems are usually composed of input modules, control algorithm modules, and output modules. In related technologies, each module is cyclically executed in a sequence from the input module to the control algorithm module and then to the output module within a certain clock cycle. External asynchronous events run in the background through interrupts, while other main tasks run in the foreground. When an external event occurs, the main task leaves the controller to the background interrupt processing function to run. After the interrupt processing function finishes running, the pr...

AI Technical Summary

Problems solved by technology

However, the disadvantage of the related technology is that the execution time uncertainty in the embedded front-end and back-end systems, that is, the timing and number of calls of a large number of interrupt processing functions are uncertain, which leads to the stability of the operating clock cycle of the output module in the cycle sex is difficult to be guaranteed

However, in the real-time control system in the automotive field, the accuracy of the clock cycle of the output module is very important. The uncertainty of the clock cycle of the output module will lead to a deviation between the CAN bus communication cycle and the designed cycle, which will lead to CAN bus question on

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