Deceleration control system, method, and computer-readable medium

• US 9,714,035 B2
• Filed: 12/15/2015
• Issued: 07/25/2017
• Est. Priority Date: 12/16/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Matsuda, Akira, Oguri, Haruki
• Primary Examiner(s): Kiswanto, Nicholas
• Assistant Examiner(s): TAVERAS, KENNY ABEL
• Application Number:
  US14/969,892
• Publication Number:
  US 20160167656A1
• Time in Patent Office: 588 Days
• Field of Search: None
• CPC Class Codes: B60W 2030/1809 Without torque flow between driveshaft and engine, e.g. with clutch disengaged or transmission in neutral
• CPC Class Codes: B60W 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 30/18072 Coasting
• CPC Class Codes: B60W 50/0097 Predicting future conditions

Abstract

A deceleration control system includes: a travel distance acquisition unit configured to acquire a travel distance measured by a sensor of a vehicle; a measured distance recording unit configured to record a measured distance in a recording medium for each travel road segment through which the vehicle travels, the measured distance being the travel distance from a predetermined measurement start position; a reference position setting unit configured to set a reference position based on the measured distance and a deceleration position in which the vehicle decelerates, the reference position being a position located on the near side of the deceleration position by a predetermined reference distance; and a deceleration control unit configured to perform deceleration control based on the travel distance from the reference position.

Claims

1. A deceleration control system for use with a vehicle having a sensor, the deceleration control system comprising:

a memory, and

a processor programmed to;

acquire a travel distance measured by the sensor of the vehicle;

record a measured distance in the memory for each travel road segment through which the vehicle travels, the measured distance being the travel distance from a predetermined measurement start position that is determined based on an actual travel distance of the vehicle;

set a reference position based on the measured distance and a deceleration position in which the vehicle decelerates, the reference position being a position located on a near side of the deceleration position by a predetermined reference distance; and

perform deceleration control in response to the vehicle reaching the reference position.

2. The deceleration control system according to claim 1, wherein

the processor sets the reference position to a position in which the measured distance is smaller than the measured distance in the deceleration position by the reference distance.

3. The deceleration control system according to claim 1, wherein

the travel road segment is specified based on a travel locus of the vehicle and map information, and

the processor records the measured distance in a change position in the memory, the change position being a position where the travel road segment changes.

4. The deceleration control system according to claim 3, wherein

the processor records a distance-remaining-to-change in the memory, the distance-remaining-to-change being a distance from the change position to an end point of the travel road segment that includes the change position, and

the processor determines the measured distance in the deceleration position to be a distance obtained by subtracting:

(A) a distance-remaining-to-deceleration from (B) a distance obtained by adding the distance-remaining-to-change relating to a change-position-immediately-preceding-deceleration to the measured distance in the change-position-immediately-preceding-deceleration, and

the distance-remaining-to-deceleration is a distance from the deceleration position to the end point of a travel road segment that includes a change-position-immediately-preceding-deceleration, which is the change position through which the vehicle travels immediately before reaching the deceleration position.

5. The deceleration control system according to claim 3, wherein,

when the change position that is closest to the deceleration position, among change positions in which a difference relative to the measured distance in the deceleration position is greater than the reference distance, is set as a reference change position, the processor sets:

a position advanced toward a deceleration position side from the reference change position by a subtracted distance as the reference position, the subtracted distance being a distance obtained by subtracting the reference distance from a distance obtained by subtracting the measured distance in the reference change position from the measured distance in the deceleration position.

6. The deceleration control system according to claim 5, wherein

the processor sets, as the reference position, a position advanced toward the deceleration position side from a start point of the travel road segment that includes the reference change position by a distance obtained by adding together the subtracted distance and a distance obtained by subtracting the distance-remaining-to-change relating to the reference change position from a segment length of the travel road segment that includes the reference change position.

7. A deceleration control method for use with a vehicle having a sensor, the deceleration control method comprising:

acquiring a travel distance measured by the sensor of the vehicle;

recording a measured distance in a memory for each travel road segment through which the vehicle travels, the measured distance being the travel distance from a predetermined measurement start position that is determined based on an actual travel distance of the vehicle;

setting a reference position based on the measured distance and a deceleration position in which the vehicle decelerates, the reference position being a position located on a near side of the deceleration position by a predetermined reference distance; and

performing deceleration control in response to the vehicle reaching the reference position.

8. A non-transitory computer-readable medium that stores a deceleration control program for use with a vehicle having a sensor, the deceleration control program comprising:

acquiring, by a computer, a travel distance measured by the sensor of the vehicle;

recording, by the computer, a measured distance in a memory for each travel road segment through which the vehicle travels, the measured distance being the travel distance from a predetermined measurement start position that is determined based on an actual travel distance of the vehicle;

setting, by the computer, a reference position based on the measured distance and a deceleration position in which the vehicle decelerates, the reference position being a position located on a near side of the deceleration position by a predetermined reference distance; and

performing, by the computer, deceleration control in response to the vehicle reaching the reference position.