Driving assistance method and driving assistance device

A driving assistance device comprising:

• a sensor configured to detect a plurality of malfunctions in devices mounted on a vehicle;
• a traveling restriction detection circuit configured to detect a traveling restriction of the vehicle;
• a candidate selection circuit configured to select candidates for a plurality of actions urged to the driver in accordance with the plurality of malfunctions;
• a priority determination circuit configured to choose a candidate having a higher priority as an action to be urged to the driver from the candidates for the plurality of actions;
• and
• an information circuit configured to inform the driver of the traveling restriction detected by the traveling restriction detection circuit and the action to be urged to the driver,
• wherein, when the traveling restriction detection circuit detects a plurality of traveling restrictions based on the plurality of malfunctions detected by the sensor, the information circuit informs the driver of a traveling restriction having a higher priority chosen from the plurality of traveling restrictions,
• the plurality of traveling restrictions include a state in which traveling of the vehicle is restricted and a state in which the vehicle cannot start up next,
• in the state in which traveling of the vehicle is restricted, the driver is informed that the vehicle is under traveling restrictions,
• in the state in which the vehicle cannot start up next, the driver is informed for urging the driver to have the vehicle serviced at a dealer,
• the state in which the traveling of the vehicle is restricted is defined as a maximum speed and a maximum drive force of the vehicle are restricted,
• the traveling restriction detection circuit calculates the maximum speed and the maximum drive force derived from a first malfunction of the plurality of malfunctions, and calculates the maximum speed and maximum drive force derived from a second malfunction of the plurality of malfunctions, and
• the priority determination circuit chooses, as the candidate having the higher priority, the action corresponding to the first malfunction having a lower maximum speed and a lower maximum drive force than the second malfunction.

A driving assistance method comprising:

• a step of detecting a plurality of malfunctions in devices mounted on a vehicle;
• a step of detecting a traveling restriction of the vehicle;
• a step of selecting candidates for a plurality of actions urged to the driver in accordance with the plurality of malfunctions;
• a step of choosing a candidate having a higher priority as an action to be urged to the driver from the candidates for the plurality of actions;
• and
• a step of informing a driver of the traveling restriction and the action to be urged to the driver,
• wherein, when a plurality of traveling restrictions are detected in association with the plurality of malfunctions, the informing step includes informing the driver of a traveling restriction having a higher priority chosen from the plurality of traveling restrictions,
• the plurality of traveling restrictions include a state in which traveling of the vehicle is restricted and a state in which the vehicle cannot start up next,
• in the state in which traveling of the vehicle is restricted, the driver is informed that the vehicle is under traveling restrictions,
• in the state in which the vehicle cannot start up next, the driver is urged the driver to have the vehicle serviced at a dealer,
• the state in which the traveling of the vehicle is restricted is defined as a state in which a maximum speed and a maximum drive force of the vehicle are restricted,
• the maximum speed and the maximum drive force derived from a first malfunction of the plurality of malfunctions are calculated, and the maximum speed and maximum drive force derived from a second malfunction of the plurality of malfunctions are calculated, the first malfunction being different from the second malfunction, and
• upon the calculated maximum speed and the calculated maximum drive force derived from the first malfunction being lower than the calculated maximum speed and the calculated maximum drive force derived from the second malfunction, the action corresponding to the first malfunction is chosen as the candidate having the higher priority.