Driving assistance apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasaaki Yamaoka
Life of this patent
Estimating the term…
Abstract
A driving assistance apparatus includes: an estimation unit configured to estimate a brake-on vehicle speed as a vehicle speed at which a driver of a vehicle starts a brake operation, based on information related to deceleration of the vehicle and vehicle-speed information; a deceleration-operation-point calculation unit configured to calculate location information of a deceleration-operation point where the driver of the vehicle starts a deceleration operation, based on the brake-on vehicle speed; and an information presentation unit configured to present driving assistance information for prompting the driver of the vehicle to perform the deceleration operation, corresponding to the calculated location information of the deceleration-operation point and a running position of the vehicle.
Claims5
A driving assistance apparatus of a road vehicle, comprising:
- a state detection device configured to detect a stop point located ahead of a present location of the vehicle while the vehicle travels on a road along a predetermined running route, wherein the stop point is detected based on information obtained by a map-information storage unit and an inter-road/vehicle communication unit, and wherein the state detection device is further configured to obtain information along the predetermined running route from the present location of the vehicle up to a location of the stop point, wherein the information includes a road surface gradient;
- an electronic control unit (ECU) programmed to:
- obtain a current speed of the vehicle at a predetermined distance before the stop point;
- estimate a vehicle speed at which a driver of the vehicle should start a brake operation in order to stop the vehicle at the stop point based on the speed of the vehicle obtained at the predetermined distance before the stop point and the road surface gradient obtained from the state detection device;
- and
- calculate location information of a deceleration-operation point where the driver of the vehicle should start a deceleration operation, based on the estimated vehicle speed for starting the brake operation and the information along the predetermined running route that was obtained by the state detection device;
- determine whether a current location of the vehicle that is acquired from the state detection device has reached the calculated location information of the deceleration-operation point;
- an information presentation unit configured to, when the vehicle reaches the deceleration-operation-point, present driving assistance information for prompting the driver of the vehicle to perform the deceleration operation.
A driving assistance apparatus of a road vehicle, comprising:
- a state detection device configured to detect a stop point located ahead of a present location of the vehicle while the vehicle travels on a road along a predetermined running route, wherein the stop point is detected based on information obtained by a map-information storage unit and an inter-road/vehicle communication unit, and wherein the state detection device is further configured to obtain a road surface gradient along the predetermined running route from the present location of the vehicle up to a location of the stop point;
- an HMI device that presents information to a driver of the road vehicle;
- and
- an electronic control unit (ECU) programmed to:
- determine that the stop point is located ahead of the present location of the vehicle while the vehicle travels;
- upon determination that the stop point is located ahead of the present location of the vehicle, acquire the road surface gradient from the state detection device and acquire an approaching vehicle speed of the vehicle;
- estimate a vehicle speed at which a driver of the vehicle should start a brake operation in order to stop the vehicle at the stop point based on the approaching vehicle speed and the road surface gradient;
- calculate a location on the road where the driver of the vehicle should start a brake on operation at the estimated vehicle speed in order to stop the vehicle at the stop point;
- calculate a location on the road where the driver of the vehicle should start an accelerator off operation in order to reach the location of the brake on operation at the estimated vehicle speed based on a deceleration to be generated by an engine brake during freewheeling after the accelerator off operation is started;
- when a current location of the vehicle reaches the calculated location for the accelerator off position, control the HMI device to notify the driver to execute the accelerator off operation;
- and
- when a current location of the vehicle reaches the calculated location for the brake on operation, control the HMI device to notify the driver to execute the brake on operation.
Dependencies are inferred from the claim text.