In-vehicle control system and abnormality diagnosis method

An abnormality diagnosis method in an in-vehicle control system in which a plurality of control devices controlling in-vehicle devices are connected to be able to communicate with each other, the abnormality diagnosis method comprising:

• an original information storage step of storing original information related to either a program to implement a control function or operation specifications in the control function when each of the plurality of control devices is sound;
• an information set setting step of setting information set to be used as an argument of a function by combining information targeting different control devices from among the original information;
• an information collecting step of collecting present information corresponding to the original information as present information from each of the control devices targeted in the information set;
• and
• an abnormality detection step of detecting any one of the targeted control devices to be abnormal when a degree of coincidence between a correct answer value calculated by the function with the information set as an argument and an evaluation value calculated by the function with the present information corresponding to the information set as an argument is lower than a criterion.

An in-vehicle control system in which a plurality of control devices controlling in-vehicle devices are connected to be able to communicate with each other, the in-vehicle control system comprising:

• an original information storage circuitry to store original information related to either a program to implement a control function or operation specifications in the control function when each of the plurality of control devices is sound;
• an information set setting circuitry to set information set to be used as an argument of a function by combining information targeting different control devices from among the original information;
• an information collector to collect present information corresponding to the original information as present information from each of the control devices targeted in the information set;
• and
• an abnormality detector to detect any one of the targeted control devices to be abnormal when a degree of coincidence between a correct answer value calculated by the function with the information set as an argument and an evaluation value calculated by the function with the present information corresponding to the information set as an argument is lower than a criterion.