Alert apparatus for vehicle

1. An alert apparatus for a vehicle, comprising:

a power supply device mounted in the vehicle;

a switch, a connection state of the switch being changed from an off state to an on state when a driver of the vehicle drives the vehicle, and being changed from the on state to the off state when the driver stops driving the vehicle;

an information acquisition device connected to the power supply device via the switch,

wherein the information acquisition device is supplied with electric power from the power supply device when the connection state of the switch is the on state, the information acquisition device being configured to acquire vehicle peripheral information including information on a moving object which is present at least behind the vehicle through use of the supplied electric power;

a memory that stores the vehicle peripheral information acquired while the connection state of the switch is the on state;

an alerting device configured to be supplied with the electric power from the power supply device regardless of whether the connection state of the switch is the on state or the off state, the alerting device being further configured to perform an alerting operation for alerting an occupant of the vehicle through use of the supplied electric power; and

a controller configured to be supplied with the electric power from the power supply device regardless of whether the connection state of the switch is the on state or the off state, the controller being programmed to:

during a period of time when the connection state of the switch is the off state:

determine whether an alert-target object is present based on the vehicle peripheral information that was stored in the memory while the connection state of the switch was the on state, the alert-target object being a moving object to be alerted when the occupant gets out of the vehicle;

calculate a predicted time until the moving object reaches a predetermined area defined by an area surrounding a vehicle body of the vehicle;

determine that the moving object is the alert-target object based on the predicted time; and

cause the alerting device to perform the alerting operation when (i) the connection state of the switch is the off state and (ii) the predicted time is equal to or shorter than a predetermined second time threshold, wherein the predetermined second time threshold is longer than the predetermined first time threshold.

2. An alert apparatus for a vehicle, comprising:

a power supply device mounted in the vehicle;

a switch, a connection state of the switch being changed from an off state to an on state when a driver of the vehicle drives the vehicle, and being changed from the on state to the off state when the driver stops driving the vehicle;

an information acquisition device connected to the power supply device via the switch,

wherein the information acquisition device is supplied with electric power from the power supply device when the connection state of the switch is the on state, the information acquisition device being configured to acquire vehicle peripheral information including information on a moving object which is present at least behind the vehicle through use of the supplied electric power;

a memory that stores the vehicle peripheral information acquired while the connection state of the switch is the on state;

an alerting device configured to be supplied with the electric power from the power supply device regardless of whether the connection state of the switch is the on state or the off state, the alerting device being further configured to perform an alerting operation for alerting an occupant of the vehicle through use of the supplied electric power; and

a controller configured to be supplied with the electric power from the power supply device regardless of whether the connection state of the switch is the on state or the off state, the controller being programmed to:

during a period of time when the connection state of the switch is the off state:

determine whether an alert-target object is present based on the vehicle peripheral information that was stored in the memory while the connection state of the switch was the on state, the alert-target object being a moving object to be alerted when the occupant gets out of the vehicle;

calculate a relative distance between the moving object and a predetermined area defined by an area surrounding a vehicle body of the vehicle;

determine that the moving object is the alert-target object based on the relative distance; and

cause the alerting device to perform the alerting operation when (i) the connection state of the switch is the off state and (ii) the relative distance is equal to or shorter than a predetermined second distance threshold, wherein the predetermined second distance threshold is longer than the predetermined first distance threshold.

3. The alert apparatus according to claim 1 ,

wherein the alert device includes a lighting device, a display device, and a sound production device,

wherein the controller is further programmed to:

when determining that the alert-target object is present in the case where the connection state of the switch is the on state, cause the alert device to perform a first alerting operation as the alerting operation; and

when determining that the alert-target object is present in the case where the connection state of the switch is the off state, cause the alert device to perform a second alerting operation as the alerting operation,

wherein the first alerting operation includes lighting of the lighting device, displaying on the display device, and sounding of the sound production device, and the second alerting operation includes lighting of the lighting device and displaying of the display device without sounding of the sound production device.

4. The alert apparatus according to claim 2 ,

wherein the alert device includes a lighting device, a display device, and a sound production device,

wherein the controller is further programmed to:

when determining that the alert-target object is present in the case where the connection state of the switch is the on state, cause the alert device to perform a first alerting operation as the alerting operation; and

when determining that the alert-target object is present in the case where the connection state of the switch is the off state, cause the alert device to perform a second alerting operation as the alerting operation,

wherein the first alerting operation includes lighting of the lighting device, displaying on the display device, and sounding of the sound production device, and the second alerting operation includes lighting of the lighting device and displaying of the display device, without sounding of the sound production device.