Vehicle control apparatus

Patent metadata

Field	Value
Publication number	US-10310508-B2
Application number	US-201715680838-A
Country	US
Kind code	B2
Filing date	Aug 18, 2017
Priority date	Aug 25, 2016
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

To control a speed at a time of entering a curved road a vehicle to autonomously travel within a travelling lane even in a case where there is an error in an estimated longitudinal position of the vehicle.
A curve travel speed calculation unit 15 b calculates a curve travel speed for a vehicle to autonomously travelling in a travelling lane based on a curve radius and an estimated error in longitudinal position. A speed planning unit 15 c and a travel control unit 17 decelerate the vehicle M such that the speed of the vehicle M becomes the curve travel speed at the time of entering the curved road in front of the vehicle M in a case where the speed of the vehicle M is equal to or higher than the curve travel speed and the curve travel speed is equal to or higher than the reference speed.

First claim

What is claimed is:

1. A vehicle control apparatus configured to cause a vehicle to autonomously travel, comprising:
a longitudinal position collation unit configured to recognize a longitudinal position which is a position of the vehicle in an extending direction of a travelling road in which the vehicle travels, based on image information from a camera and position information of a landmark on a map;
a longitudinal position estimation unit configured to estimate the longitudinal position based on a result of detection by an internal sensor that detects a state of the vehicle and a result of recognition by the longitudinal position collation unit;
an error estimation unit configured to estimate an error in longitudinal position estimated by the longitudinal position estimation unit, based on accuracy of detection by the internal sensor;
a radius acquisition unit configured to acquire a curve radius of a curved road in front of the vehicle using the estimated longitudinal position and the map information;
a curve travel speed calculation unit configured to calculate a curve travel speed for the vehicle to autonomously travel in a travelling lane on the curved road having the acquired curve radius based on the acquired curve radius and the estimated error in longitudinal position;
a speed control unit configured to decelerate the vehicle such that vehicle speed becomes the curve travel speed at the time of entering the curved road in front of the vehicle in a case where the vehicle speed is equal to or higher than the curve travel speed and the curve travel speed is equal to or higher than a preset reference speed, and configured to decelerate the vehicle such that the current speed is maintained or the vehicle speed becomes the reference speed at the time of entering the curved road in front of the vehicle in a case where the vehicle speed is equal to or higher than the curve travel speed and the curve travel speed is lower than the reference speed; and
a request unit configured to perform a hands-on request to switch a control of the vehicle to a manual driving by a driver in a case where the vehicle speed is equal to or higher than the curve travel speed and the curve travel speed is lower than the reference speed,
wherein, the curve travel speed calculation unit is configured to make the curve travel speed be low in a case where the curve radius is short compared to a case where the curve radius is long, and configured to make the curve travel speed be low in a case where the error in longitudinal position is large compared to a case where the error in longitudinal position is small.

2. The vehicle control apparatus according to claim 1 ,
wherein the request unit is configured to calculate a reference distance which is a travel distance in a case of travelling during reference time at the current speed of the vehicle based on the reference time preset as a time for switching a driving state of the vehicle to a manual driving state from an autonomous driving state and the current speed of the vehicle, and configured to perform the hands-on request at the position before the curved road in front of the vehicle as much as the reference distance.

Assignees

• Toyota Motor Co Ltd

Inventors

• Kunisa Akiomi
• Matsui Toshiki
• Nemoto Yusuke
• Takahashi Norihiro

Classifications

• B60W30/18145

  Cornering · CPC title

• B60W30/143

  Speed control (B60W30/16 takes precedence) · CPC title

• B60W50/082

  Selecting or switching between different modes of propelling · CPC title

• B60W50/14

  Means for informing the driver, warning the driver or prompting a driver intervention · CPC title

• B60W2552/30

  Road curve radius · CPC title