Electronic control unit

Abstract

The present invention provides, as one aspect, an electronic control unit, including a plurality of control circuits having a communication function, the control circuits including a main control circuit and a sub-control circuit, and a signal conversion circuit which is connected to an external bus to acquire a transmission signal passing through the bus and output a transmission signal produced in each of the control circuits to the bus. The main control circuit outputs a power-on signal to the signal conversion circuit to turn on the signal conversion circuit. The sub-control circuit starts communication using the communication function when a predetermined power-on condition is met, the power-on condition indicating power-on of the signal conversion circuit.

Dependencies are inferred from the claim text.