Vehicular Deceleration Aiding Device

• US 20110087415A1
• Filed: 07/28/2009
• Published: 04/14/2011
• Est. Priority Date: 09/25/2008
• Status: Abandoned Application

• Current Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Original Assignee: Hitachi Automotive Systems Limited (Hitachi, Ltd.)
• Inventors: Saito, Shinjiro, Yokoyama, Atsushi, Yoshida, Tatsuya
• Application Number:
  US12/920,255
• Publication Number:
  US 20110087415A1
• Time in Patent Office: Days
• US Class Current: 701/71
• CPC Class Codes: B60T 2201/16 Curve braking control, e.g. turn control within ABS control algorithm
• CPC Class Codes: B60T 2210/24 Curve radius
• CPC Class Codes: B60T 2210/36 Global Positioning System [GPS]
• CPC Class Codes: B60T 7/22 initiated by contact of vehicle, e.g. bumper, with an external object, e.g. another vehicle , or by means of contactless obstacle detectors mounted on the vehicle
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2552/20 Road profile, i.e. the change in elevation or curvature of a plurality of continuous road segments
• CPC Class Codes: B60W 2552/30 Road curve radius
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: B60W 30/18009 related to particular drive situations
• CPC Class Codes: B60W 30/18145 Cornering
• CPC Class Codes: B60W 50/0097 Predicting future conditions

Abstract

A deceleration aiding device capable of achieving deceleration control which reflects a driver'"'"'s intention more accurately according to a driver'"'"'s intention to decelerate a vehicle, and by which the acceleration of the vehicle is difficult to exceed a road surface friction coefficient is provided. The deceleration aiding device includes: a road information acquisition unit (51) for acquiring information of a curved road in front of a vehicle; a curve information calculation unit (52) for calculating a section length from the vehicle to an entrance position of the curved road based on the information of the curved road; a start timing determination unit (54) for determining a start timing for starting deceleration control of the vehicle according to a driving state of the vehicle; a target deceleration calculation unit (55) for calculating a target deceleration in the deceleration control; and a deceleration control unit (56) for performing deceleration control on the vehicle based on the target deceleration, wherein the target deceleration calculation unit (55) calculates the target deceleration based on the section length and a vehicle speed at the start timing such that a deceleration of the vehicle in the deceleration control and a lateral acceleration of the vehicle when traveling along the curved road are larger as the section length is shorter.

Claims

1. A vehicular deceleration aiding device comprising:

a road information acquisition unit for acquiring information of a curved road in front of a vehicle;

a curve information calculation unit for calculating a section length from the vehicle to an entrance position of the curved road based on the information of the curved road;

a start timing determination unit for determining a start timing for starting deceleration control of the vehicle according to a driving state of the vehicle;

a target deceleration calculation unit for calculating a target deceleration in the deceleration control; and

a deceleration control unit for performing deceleration control on the vehicle based on the target deceleration,

wherein the target deceleration calculation unit calculates the target deceleration based on the section length and a vehicle speed at the start timing such that a deceleration of the vehicle in the deceleration control is larger as the section length is shorter.

3. The vehicular deceleration aiding device according to claim 1, wherein the deceleration control unit performs the deceleration control until the vehicle reaches the entrance position of the curved road.

4. The vehicular deceleration aiding device according to claim 1, wherein the curve information calculation unit calculates radii of curvature of a plurality of continuous arc portions constituting the curved road based on the information of the curved road, and calculates the section length by employing an entrance position of the curved road in an arc portion having a smallest radius of curvature as the entrance position of the curved road.

5. The vehicular deceleration aiding device according to claim 1, wherein the start timing determination unit determines the start timing according to a timing when an operating angle of an accelerator pedal is zero as the driving state of the vehicle.

8. The vehicular deceleration aiding device according to claim 1, wherein the curve information calculation unit calculates radii of curvature of a plurality of continuous arc portions constituting the curved road based on the information of the curved road, sets curved road positions where the radii of curvature are respectively calculated, as the entrance position of the curved road, and calculates a section length from the vehicle to each of the curved road positions as the section length,

the target deceleration calculation unit calculates the target deceleration with respect to each of the section lengths, and

the deceleration control unit performs the deceleration control on the vehicle based on a largest target deceleration among the target decelerations.

2. A vehicular deceleration aiding device comprising:

a road information acquisition unit for acquiring information of a curved road in front of a vehicle;

a curve information calculation unit for calculating a section length from the vehicle to an entrance position of the curved road based on the information of the curved road;

a start timing determination unit for determining a start timing for starting deceleration control of the vehicle according to a driving state of the vehicle;

a target deceleration calculation unit for calculating a target deceleration in the deceleration control; and

a deceleration control unit for performing deceleration control on the vehicle based on the target deceleration,

wherein the target deceleration calculation unit calculates the target deceleration based on the section length and a vehicle speed at the start timing such that a deceleration of the vehicle in the deceleration control and a lateral acceleration of the vehicle when traveling along the curved road are larger as the section length is shorter.

6. The vehicular deceleration aiding device according to claim 2, wherein the target deceleration is calculated such that a largest value of the lateral acceleration and a largest value of the deceleration before the vehicle enters the curved road have a predetermined ratio.

7. The vehicular deceleration aiding device according to claim 6, wherein the target deceleration calculation unit comprises a ratio change unit for changing the ratio.

9. The vehicular deceleration aiding device according to claim 2, wherein the deceleration control unit performs the deceleration control until the vehicle reaches the entrance position of the curved road.

10. The vehicular deceleration aiding device according to claim 2, wherein the curve information calculation unit calculates radii of curvature of a plurality of continuous arc portions constituting the curved road based on the information of the curved road, and calculates the section length by employing an entrance position of the curved road in an arc portion having a smallest radius of curvature as the entrance position of the curved road.

11. The vehicular deceleration aiding device according to claim 2, wherein the start timing determination unit determines the start timing according to a timing when an operating angle of an accelerator pedal is zero as the driving state of the vehicle.

12. The vehicular deceleration aiding device according to claim 2, wherein the curve information calculation unit calculates radii of curvature of a plurality of continuous arc portions constituting the curved road based on the information of the curved road, sets curved road positions where the radii of curvature are respectively calculated, as the entrance position of the curved road, and calculates a section length from the vehicle to each of the curved road positions as the section length,

the target deceleration calculation unit calculates the target deceleration with respect to each of the section lengths, and

the deceleration control unit performs the deceleration control on the vehicle based on a largest target deceleration among the target decelerations.