Electronic control device
The present invention achieves, using simple circuits, timing synchronization among ECUs of an electronic control device which is configured from a driver ECU, a sensor ECU, and an integrated ECU which are connected over a network. This electronic control device is provided with a driver ECU for driving various loads for vehicular control, a sensor ECU for sampling various sensor signals, and an integrated ECU which is connected to the driver ECU and sensor ECU over a network and calculates command values to the various loads in accordance with various sensor data, the electronic control device being characterized in that the driver ECU has timer D for generating internal timing, the sensor ECU has timer S for generating internal timing, and the integrated ECU has timer M serving as a reference for timer D and timer S.
1. An electronic control device, comprising:
a driver ECU that drives various loads for vehicular control;
a sensor ECU that samples various sensor signals; and
an integrated ECU that is connected to the driver ECU and the sensor ECU via a network and calculates command values for various loads from various sensor data,
wherein the driver ECU includes a timer D for generating internal timing,
the sensor ECU includes a timer S for generating internal timing, and
the integrated ECU includes a timer M that is a reference of the timer D and the timer S,
wherein the driver ECU includes a threshold value register D for generating internal timing and a capture register D that holds a value of the timer D at a certain timing,
the integrated ECU includes:
a capture register M that holds a value of the timer M at a certain timing;
a threshold value register MD* whose value is synchronized with a value of the threshold value register D via the network;
a capture register MD whose value is synchronized with a value of the capture register D via the network; and
a threshold value register MD for generating internal timing of the driver,
the timer D and the timer M are reset at the same timing,
values of the timer D and the timer M are captured at the same timing,
the captured value of the timer D is stored in the capture register D and the captured value of the timer M is stored in the capture register M respectively, and
a value that is stored in the threshold value register MD* is calculated based on a value stored in each of the threshold value register MD, the capture register MD, and the capture register M.
2. The electronic control device according to claim 1 , wherein the driver ECU compares the values of the timer D and the threshold value register D to generate pulses that drive various loads.
3. An electronic control device, comprising:
a driver ECU that drives various loads for vehicular control;
a sensor ECU that samples various sensor signals; and
an integrated ECU that is connected to the driver ECU and the sensor ECU via a network and calculates command values for various loads from various sensor data,
wherein the driver ECU includes a timer D for generating internal timing,
the sensor ECU includes a timer S for generating internal timing, and
the integrated ECU includes a timer M that is a reference of the timer D and the timer S,
wherein the sensor ECU includes a threshold value register S for generating internal timing and a capture register S that holds a value of the timer S at a certain timing,
the integrated ECU includes:
a capture register M that holds a value of the timer M at a certain timing;
a threshold value register MS* whose value is synchronized with a value of the threshold value register S via the network;
a capture register MS whose value is synchronized with a value of the capture register S via the network; and
a threshold value register MS for generating internal timing of the driver,
the timer S and the timer M are reset at the same timing,
values of the timer S and the timer M are captured at the same timing,
the captured value of the timer S is stored in the capture register S and the captured value of the timer M is stored in the capture register M respectively, and
a value that is stored in the threshold value register MS* is calculated based on a value stored in each of the threshold value register MS, the capture register MS, and the capture register M respectively.
4. The electronic control device according to claim 3 , wherein the sensor ECU compares the values of the timer S and the threshold value register S to generate sampling timings of various sensor data.
5. The electronic control device according to claim 3 , wherein the sensor ECU compares the values of the timer S and the threshold value register S to generate timing at which the sensor ECU transmits data on the network.