Hitachi Automotive Systems, Ltd.

Hitachi Astemo Ltd.

Toshihisa Arai

Koji Yuasa

Yusuke Abe

Motoki Tatsumi

Toshifumi Miyake

Takuya Kobayashi

Mayumi Maeda

Yohei Takahashi

An electronic control device includes a nonvolatile memory having allocated two storage areas that are exclusively switchable between an active state and an inactive state, the two storage areas being set such that in a state in which a program is written in the storage area in the active state, a program is written for updating to the storage area in the inactive state in response to an instruction from an external device, followed by switching the storage area in the active state to the inactive state and switching the storage area in the inactive state to the active state. In the electronic control device, when the program written in the storage area in the active state differs from the program written in the storage area in the inactive state, the program written in the storage area switched to the active state is copied to the storage area in the inactive state.

Electronic control device and program-update method

An electronic control unit for vehicle capable of receiving a program by communication expands the received program in a volatile memory and executes the expanded program. As an example of this program, there is a program for changing a communication environment for communicating with another unit.

Electronic control unit for vehicle and method of executing program

An electronic control unit for a vehicle including a nonvolatile memory capable of erasing and writing data electrically and two buffers to acquire, by communication, divided data obtained by dividing a program by predetermined size. Then, in parallel with using the two buffers alternately to receive divided data, the electronic control unit for a vehicle uses one buffer that is not used to receive divided data to write the received divided data into the nonvolatile memory.

Electronic control unit for vehicle and method of writing data

A vehicle control apparatus according to the present invention includes a main electronic control unit, and a sub electronic control unit capable of mutual communication with the main electronic control unit. The main electronic control unit outputs a signal for preventing timeout to at least one of the external device and the sub electronic control unit, when mediating data communication between the external device and the sub electronic control unit.

Vehicle control apparatus and method for rewriting program therefor

An electronic control unit includes: a nonvolatile memory capable of erasing data in units of erasure blocks and also writing data in units of write blocks smaller than the erasure blocks; and a processor. In response to a data rewrite request from outside, the processor of the electronic control unit erases data in a portion of the nonvolatile memory in units of erasure blocks and writes data into the portion of the nonvolatile memory in units of write blocks. The amount of data sent to the electronic control unit from outside is thereby decreased and the time needed to rewrite data in the nonvolatile memory is reduced.

Electronic control unit and method for rewriting data

An electronic control unit for a vehicle includes a nonvolatile memory that is capable of erasing and writing data electrically, and capable of receiving a program to be written into the nonvolatile memory in units of a predetermined size by means of communication using a communication buffer. The electronic control unit for the vehicle uses communication buffers, the number of which is greater than the number of communication buffers used in an in-vehicle communication environment, to receive the program.

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Isesaki, Japan

Toshihisa Arai