Vehicle electronic control system, and method for updating program used therein

An electronic control device comprising:

• a second detection unit that detects a state of a vehicle;
• a notification unit that notifies completion of rewrite when program rewrite is completed;
• an activation determination unit that determines whether or not to activate the program rewritten;
• and
• an activation execution unit that activates the program rewritten,
• the activation execution unit activating the program rewritten according to an instruction from an activation instruction unit of a master device, the activation instruction unit instructing the activation execution unit to activate the program rewritten when the master device acquires notification of the completion of rewrite from the notification unit and determines that the vehicle is parked using a first detection unit, the first detection unit detecting the state of the vehicle, the first detection unit being different from the second detection unit,
• the activation determination unit determining whether or not the vehicle is parked using the second detection unit when the activation execution unit activates the program rewritten according to the instruction from the activation instruction unit,
• the activation execution unit activating the program rewritten when the activation determination unit determines that the vehicle is parked using the second detection unit,
• wherein the electronic control device comprises at least two or more groups of electronic control devices and the at least two or more groups of electronic control devices connect to the master device, and
• the second detection unit acquires the state of the vehicle from the group of electronic control devices selected from the at least two or more groups of electronic control devices.

A master device that gives an instruction to an electronic control device, the master device comprising:

• a first detection unit that detects a state of a vehicle, the first detection unit being different from a second detection unit that is included in the electronic control device and detects the state of the vehicle;
• and
• an activation instruction unit that instructs an activation execution unit of the electronic control device to activate the program rewritten when acquiring notification of completion of rewrite from a notification unit and determining that the vehicle is parked using the first detection unit, the activation execution unit activating the program rewritten, the notification unit being included in the electronic control device and notifying the completion of rewrite when program rewrite is completed,
• the electronic control device including an activation determination unit that determines whether or not to activate the program rewritten,
• the activation determination unit determining whether or not the vehicle is parked using the second detection unit when the activation execution unit activates the program rewritten according to the instruction from the activation instruction unit,
• the activation execution unit activating the program rewritten when the activation determination unit determines that the vehicle is parked using the second detection unit,
• the master device is connected to at least two or more groups of electronic control devices, a group of electronic control devices being composed of the electronic control device,
• the first detection unit acquires the state of the vehicle from the electronic control device, and
• the second detection unit acquires the state of the vehicle from the group of electronic control devices selected from the at least two or more groups of electronic control devices.