Control system for and control method of autonomous driving vehicle

1. A control system for an autonomous driving vehicle, comprising:

a notification device configured to give notification to a driver;

an operation device configured to be operated by the driver; and

an electronic control unit comprising:

a driving control part configured to perform autonomous driving, the driving control part being configured to terminate autonomous driving and switch vehicle operation to manual driving when the driver operates the operation device during autonomous driving;

a reliability value calculation part configured to calculate an autonomous driving reliability value expressing a degree of reliability of autonomous driving during autonomous driving; and

a notification control part configured to control the notification device to notify a request for preparing for manual driving to the driver when the autonomous driving reliability value is equal to or smaller than a predetermined preparation request value during autonomous driving, the request for preparing for manual driving being one which requests the driver to establish conditions for preparing for manual driving while the driver is continuing with autonomous driving, and

to control the notification device to stop notification of the request for preparing for manual driving and notify a request for terminating autonomous driving to the driver when the autonomous driving reliability value is equal to or smaller than a termination request value which is set smaller than the preparation request value during autonomous driving, the request for terminating autonomous driving being one which requests the driver to operate the operation device to terminate autonomous driving.

2. The control system for an autonomous driving vehicle according to claim 1 , wherein the notification control part is configured to control the notification device to stop notification of the request for preparing for manual driving when the autonomous driving reliability value becomes larger than the preparation request value during notification of the request for preparing for manual driving.

3. The control system for an autonomous driving vehicle according to claim 1 , wherein the reliability value calculation part is configured to calculate the autonomous driving reliability value based on density of surrounding vehicles expressing a degree of density of other vehicles around the vehicle.

4. The control system for an autonomous driving vehicle according to claim 1 , wherein the reliability value calculation part is configured to calculate the autonomous driving reliability value based on precision of localization of the vehicle.

5. The control system for an autonomous driving vehicle according to claim 1 , wherein the reliability value calculation part is configured to calculate the autonomous driving reliability value based on weather around the vehicle.

6. A control method of an autonomous driving vehicle comprising:

a notification device configured to give notification to a driver;

an operation device configured to be operated by the driver; and

an electronic control unit,

the control method including steps of, using the electronic control unit:

performing autonomous driving;

terminating autonomous driving and switching vehicle operation to manual driving when the driver operates the operation device during autonomous driving;

calculating an autonomous driving reliability value expressing a degree of reliability of autonomous driving during autonomous driving;

controlling the notification device to notify a request for preparing for manual driving to the driver when the autonomous driving reliability value is equal to or smaller than a predetermined preparation request value during autonomous driving, the request for preparing for manual driving being one which requests the driver to establish conditions for preparing for manual driving while the driver is continuing with autonomous driving; and

controlling the notification device to stop notification of the request for preparing for manual driving and notify a request for terminating autonomous driving to the driver when the autonomous driving reliability value is equal to or smaller than a termination request value which is set smaller than the preparation request value during autonomous driving, the request for terminating autonomous driving being one which requests the driver to operate the operation device to terminate autonomous driving.

7. The control method of an autonomous driving vehicle according to claim 6 , further including the steps of, using the electronic control unit, controlling the notification device to stop notification of the request for preparing for manual driving when the autonomous driving reliability value becomes larger than the preparation request value during notification of the request for preparing for manual driving.

8. The control method of an autonomous driving vehicle according to claim 6 , further including the steps of, using the electronic control unit, calculating the autonomous driving reliability value based on density of surrounding vehicles expressing a degree of density of other vehicles around the vehicle.

9. The control method of an autonomous driving vehicle according to claim 6 , further including the steps of, using the electronic control unit, calculating the autonomous driving reliability value based on precision of localization of the vehicle.

10. The control method of an autonomous driving vehicle according to claim 6 , further including the steps of, using the electronic control unit, calculating the autonomous driving reliability value based on weather around the vehicle.