Information processing device
An execution device is configured to execute a detection process for detecting a state that a preceding vehicle is approaching a host vehicle, an acquisition process for acquiring a deceleration of the host vehicle and a deceleration of the preceding vehicle when the preceding vehicle is approaching the host vehicle, and a calculation process for calculating, based on the deceleration of the host vehicle and the deceleration of the preceding vehicle, an index value indicating a tendency of a brake operation force of a driver of the host vehicle.
1 . A host vehicle comprising:
a brake system;
a plurality of wheels, a vehicle wheel speed sensor provided on at least one of the plurality of wheels;
a plurality of sensors configured to detect a preceding vehicle that is located in front of the host vehicle in a traveling direction of the host vehicle, the plurality of sensory including a camera that captures an image in front of the host vehicle, a radar sensor and a light detection and ranging (LiDAR) sensor; and
an information processing device mounted on the host vehicle, the information processing device including a processor and memory storing a program that is executed by the processor to:
acquire an inter-vehicle distance between the host vehicle and the preceding vehicle that is determined based on information output by one or more of the plurality of sensors;
calculate a speed of the host vehicle based on information output by the vehicle wheel speed sensor of the host vehicle;
acquire a relative speed of the preceding vehicle with respect to the host vehicle, the relative speed being determined by time-differentiating the inter-vehicle distance between the host vehicle and the preceding vehicle;
determine that the preceding vehicle is approaching the host vehicle when the relative speed that has been acquired remains negative for at least a predetermined time period;
when the processor has determined that the preceding vehicle is approaching the host vehicle, calculate a first deceleration value which is a deceleration of the host vehicle and calculate a second deceleration value which is a deceleration of the preceding vehicle, the first deceleration value being calculated by time-differentiating the speed of the host vehicle that was calculated based on the information output by the vehicle wheel speed sensor of the host vehicle, the second deceleration value being calculated by time-differentiating a sum of the relative speed and the speed of the host vehicle; and
calculate an index value indicating a tendency of a brake operation force of the brake system of the host vehicle by a driver of the host vehicle, the index value being calculated from the first deceleration value of the host vehicle and the second deceleration value of the preceding vehicle and being indicative of a frequency by which the driver of the host vehicle performed a weaker brake operation than the preceding vehicle.
2 . The host vehicle according to claim 1 , wherein the index value is calculated from a number of times that a maximum absolute value of the first deceleration value of the host vehicle is smaller than a maximum absolute value of the second deceleration value of the preceding vehicle.
3 . The host vehicle according to claim 1 , wherein the index value is acquired by dividing (1) a number of times that a maximum absolute value of the first deceleration value of the host vehicle is smaller than a maximum absolute value of the second deceleration value of the preceding vehicle by (2) a number of times that the preceding vehicle decelerates.