Arithmetic device
An arithmetic device includes a first arithmetic chip configured to perform arithmetic processing for realizing driving assistance functions of a vehicle, and a second arithmetic chip configured to perform arithmetic processing for realizing the driving assistance functions of the vehicle, wherein, among the driving assistance functions, second functions realized by the first arithmetic chip along with the second arithmetic chip includes a function of providing at least some of first functions realized without depending on arithmetic processing of the second arithmetic chip in a state in which a task imposed on a driver has been reduced, as compared to the first functions.
1 . An arithmetic device comprising:
a first arithmetic chip, comprising a first group of processors, configured to execute instructions to perform first arithmetic processing for providing driving assistance functions of a vehicle; and
a second arithmetic chip, comprising a second group of processors, configured to execute instructions to perform second arithmetic processing for providing the driving assistance functions of the vehicle,
a board on which the first arithmetic chip is mounted and that is provided with a free area for mounting the second arithmetic chip,
wherein, the driving assistance functions include first functions and second functions,
the first functions are functions provided in a first state in which the steering wheel is being gripped by a driver and provided by the first arithmetic processing of the first arithmetic chip without the second arithmetic processing of the second arithmetic chip,
the second functions are functions provided in a second state in which the steering wheel is not being gripped by the driver and provided by the first arithmetic processing of the first arithmetic chip and the second arithmetic processing of the second arithmetic chip, the second functions including a function of providing at least one function of the first functions in a state in which a task imposed on a driver has been reduced as compared to the first functions,
the first functions are provided by the first arithmetic chip in a third state in which the second arithmetic chip is not mounted in the free area,
the second functions are provided by both the second arithmetic chip and the first arithmetic chip in a third state in which the second arithmetic chip is mounted in the free area, and
controlling at least a speed or a steering force of the vehicle based on at least one function of the first functions or the second functions.
2 . The arithmetic device according to claim 1 , further comprising a third arithmetic chip, comprising at least one processor, configured to receive a result of the first arithmetic processing of the first arithmetic chip and a result of the second arithmetic processing of the second arithmetic chip and to determine whether or not the driving assistance functions are executable,
wherein the third arithmetic chip has a higher functional safety level than the first arithmetic chip and the second arithmetic chip.
3 . The arithmetic device according to claim 1 ,
wherein the first functions include at least an inter-vehicle distance keeping function, a track keeping function, and a deceleration-for-obstacle function, and the second arithmetic chip performs the second arithmetic processing for determining whether or not the task can be reduced.
4 . The arithmetic device according to claim 3 ,
wherein a result of matching between a position of the vehicle and map information is input to the second arithmetic chip, and the second arithmetic chip performs the second arithmetic processing for determining whether or not the task can be reduced on the basis of the matching result.
5 . The arithmetic device according to claim 1 ,
wherein the second arithmetic chip performs the second arithmetic processing for alternative control when a driver's physical condition deteriorates or when soundness of a system including the arithmetic device deteriorates.
6 . An arithmetic device comprising:
a first arithmetic chip, representing a first multi-core processor, configured to execute instructions to perform first arithmetic processing for providing driving assistance functions of a vehicle; and
a board on which the first arithmetic chip is mounted,
wherein the board is provided with a free area for mounting a second arithmetic chip, representing a second multi-core processor, configured to perform second arithmetic processing for providing the driving assistance functions of the vehicle,
wherein, the driving assistance functions include first functions and second functions,
the first functions are functions provided in a first state in which the steering wheel is being gripped by a driver and provided by the first arithmetic processing of the first arithmetic chip without the second arithmetic processing of the second arithmetic chip,
the second functions are functions provided in a second state in which the steering wheel is not being gripped by the driver and provided by the first arithmetic processing of the first arithmetic chip and the second arithmetic processing of the second arithmetic chip when the second arithmetic chip is mounted in the free area on the board, the second functions include a function of providing at least one function of the first functions in a state in which a task is imposed on a driver has been reduced as compared to the first function,
the first functions are provided by the first arithmetic chip in a third state in which the second arithmetic chip is not mounted in the free area,
the second functions are provided by both the second arithmetic chip and the first arithmetic chip in a third state in which the second arithmetic chip is mounted in the free area, and
controlling at least a speed or a steering force of the vehicle based on at least one function of the first functions or the second functions.