Electronic control device and determination method

1. An electronic control device comprising:

a receiving unit that receives a data signal from an external device via a transmission line;

a transmission characteristic extraction unit that uses an eye pattern at a first sampling number N 1 and an eye pattern at a second sampling number N 2 to estimate a characteristic of an eye pattern at a third sampling number N 3 and calculate transition information of a waveform, wherein N 3 is greater than N 1 and N 2 ;

a determination criterion selection unit that determines a determination criterion based on the transition information of the waveform in the data signal; and

a condition determination unit that determines a condition of a communication system including the external device, the receiving unit, and the transmission line based on a transmission waveform characteristic in the data signal and the determination criterion.

2. The electronic control device according to claim 1 , wherein

the transmission waveform characteristic in the data signal is a waveform adjustment setting value of an equalizer or pre-emphasis that adjusts a waveform of the data signal, and

the condition determination unit determines a condition of a communication unit based on the transmission waveform characteristic and the determination criterion.

3. The electronic control device according to claim 1 , further comprising

a recording unit that stores log data of the transmission waveform characteristic related to the data signal.

4. The electronic control device according to claim 1 , wherein

the determination criterion selection unit determines the determination criterion based on power supply voltages and temperature information of the external device and the electronic control device.

5. The electronic control device according to claim 1 , further comprising:

a second receiving unit that receives a second data signal from a second external device via a second transmission line;

a second determination criterion selection unit that determines a second determination criterion based on transition information of a waveform in the second data signal; and

a second condition determination unit that determines a condition of a second communication system including the second external device, the second receiving unit, and the second transmission line based on a transmission waveform characteristic in the second data signal and the second determination criterion.

6. A determination method performed by a computer including a receiving unit that receives a data signal from an external device via a transmission line, the determination method comprising:

using an eye pattern at a first sampling number N 1 and an eye pattern at a second sampling number N 2 to estimate a characteristic of an eye pattern at a third sampling number N 3 and calculate transition information of a waveform, wherein N 3 is greater than N 1 and N 2 ;

determining a determination criterion based on the transition information of the waveform in the data signal; and

determining a condition of a communication system including the external device, the receiving unit, and the transmission line based on a transmission waveform characteristic in the data signal and the determination criterion.

7. An electronic control device comprising:

a receiver that receives a data signal from an external device via a transmission line; and

a controller configured to

determine a determination criterion based on transition information of a waveform in the data signal, and based on power supply voltages and temperature information of each of the external device and the electronic control device; and

determine a condition of a communication system including the external device, the receiver, and the transmission line based on a transmission waveform characteristic in the data signal and the determination criterion.