VEHICLE-MOUNTED CONTROL DEVICE

摘要

A vehicle-mounted control device, which communicates with a vehicle-mounted node via a common bus and follows a communication protocol that the lower the priority of a data frame output from the vehicle-mounted node, the longer a waiting time, includes: an arbitration device that suspends transmission of the transmission target frame to the bus when the priority of a transmission target frame is lower than an output data frame from the vehicle-mounted node, and continues transmission of the transmission target frame to the bus when the priority of the transmission target frame is higher than the output data frame; and a change device that changes the priority of the transmission target frame to be the highest of all data frames when the transmission of the transmission target frame is suspended for a prescribed time or longer as a result of arbitration control by the arbitration device.

主权项

1. A vehicle-mounted control device which communicates with at least one vehicle-mounted node via a common bus, sets a priority to a data frame that is outputted from the at least one vehicle-mounted node, and follows a communication protocol defined in such a manner that the lower the priority, the longer a waiting time until transmission to the bus, the vehicle-mounted control device comprising:
an arbitration device that performs arbitration control to arbitrates transmission of a transmission target frame in such a manner that:
a data frame to be transmitted to the bus is defined as the transmission target frame;when the transmission target frame collides with an output data frame from the vehicle-mounted node, and the priority of the transmission target frame is lower than the priority of the output data frame from the vehicle-mounted node, the arbitration device suspends the transmission of the transmission target frame to the bus; andwhen the transmission target frame collides with the output data frame from the vehicle-mounted node, and the priority of the transmission target frame is higher than the priority of the output data frame from the vehicle-mounted node, the arbitration device continues the transmission of the transmission target frame to the bus; a change device that performs a change control to change the priority of the transmission target frame so as to be the highest of all data frames when the transmission of the transmission target frame is suspended for a time equal to or longer than a preliminary defined prescribed time as a result of the arbitration control by the arbitration device; the data frame represents identification information of a content of data in the data frame and information of the vehicle-mounted node or the vehicle-mounted control device which has transmitted the data frame, and has a standard ID being a region that includes data information functioning as the priority; and when the transmission of the transmission target frame is suspended for a time equal to or longer than the prescribed time as a result of the arbitration by the arbitration device, the change device performs the change control in such a manner that the priority represented by the standard ID of the transmission target frame is changed to the highest of all data frames, and an extended ID as a region including the data information of the priority being changed to the highest is added to the transmission target frame.