Decision system of periodic CAN message loss fault

The utility model provides a decision system of periodic CAN message loss fault, comprising a message reception module, a first timer module used for circularly starting a first timer, wherein the value of the first timer is the period of receiving a CAN message; a second timer module used for starting a second timer when a first timer time arrives and the message reception module does not receive a message; a counter module used for setting a counter. The counter carries out statistics when the message is received within the setting times of the first and second timers, and carries out the reverse statistics when the message is not received within the setting time of the second timer, so that a message loss fault is decided whether to happen according to that whether the statistical value of the counter reaches the set upper limit value or lower limit value of the counter. The decision system of periodic CAN message loss fault of the utility model enables not only the message continuous loss fault to be dete