On-board apparatus, on-board system, control method, and computer program

A control method for controlling an on-board apparatus that is connected to a plurality of ECUs via a communication bus, wherein the plurality of ECUs include:

• a first ECU;
• and a second ECU that is connected to the first ECU via a communication line that is different from the communication bus, the first ECU includes:
• a first transceiver that is a transceiver connected to the communication bus, the first transceiver, upon receiving a control message corresponding to a matching pattern recorded in a register of the first transceiver, switching the first ECU to a normal mode from a sleep mode in which functions are limited and power consumption is reduced compared to in the normal mode;
• and
• a second transceiver that is a transceiver connected to the communication line, the second transceiver switching the first ECU from the sleep mode to the normal mode upon receiving a predetermined activation signal, and
• the control method comprises:
• a first step of receiving, from the communication bus, a control message corresponding to a wake-up pattern for switching the first ECU from the sleep mode to the normal mode;
• a second step of determining whether or not a first activation notification indicating that the first ECU has switched to the normal mode is received within a predetermined amount of time after the first step;
• and
• a third step of transmitting the activation signal to the first ECU via the communication bus, the second ECU, and the communication line in response to a determining, after predetermined time has elapsed, that the first activation notification has not been received.

A non-transitory computer readable medium storing instruction executed to perform a method for controlling an on-board system having a plurality of ECUs connected to an on board apparatus via a communication bus, wherein the plurality of ECUs include:

• a first ECU;
• and a second ECU that is connected to the first ECU via a communication line that is different from the communication bus,
• the first ECU includes:
• a first transceiver that is a transceiver connected to the communication bus, the first transceiver, upon receiving a control message corresponding to a matching pattern recorded in a register of the first transceiver, switching the first ECU to a normal mode from a sleep mode in which functions are limited and power consumption is reduced compared to in the normal mode;
• and a second transceiver that is a transceiver connected to the communication line, the second transceiver switching the first ECU from the sleep mode to the normal mode upon receiving a predetermined activation signal, and
• the method includes:
• a first step of receiving, from the communication bus, a control message corresponding to a wake-up pattern for switching the first ECU from the sleep mode to the normal mode;
• a
• second step of determining whether or not a first activation notification indicating that the first ECU has switched to the normal mode is received within a predetermined amount of time after the first step;
• and
• a third step of transmitting the activation signal to the first ECU via the communication bus, the second ECU, and the communication line if the first activation notification in the second step has not been received within a predetermined amount of time.