Deceleration control system and deceleration control method for vehicle

• US 20050267665A1
• Filed: 03/31/2005
• Published: 12/01/2005
• Est. Priority Date: 05/12/2004
• Status: Abandoned Application

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Shiiba, Kazuyuki, Iwatsuki, Kunihiro
• Application Number:
  US11/094,216
• Publication Number:
  US 20050267665A1
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/165 Rate of change
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/18136 Engine braking
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: F16H 61/21 Providing engine brake control

Abstract

There is provided a deceleration control system for a vehicle, in which a braking force is applied to a vehicle by a braking device when a determination that a shift speed or a gear ratio of a transmission of a vehicle is changed to a shift speed or a gear ratio for a relatively low vehicle speed is made. Control is performed such that a deceleration (Gt), which is applied to the vehicle by activating the braking device and performing a shift operation for changing the shift speed or the gear ratio of the transmission of the vehicle to the shift speed or the gear ratio for the relatively low vehicle speed, becomes larger than a deceleration (402max), which is applied to the vehicle by only performing the shift operation.

Claims

1. A deceleration control system for a vehicle, comprising:

a braking device which applies a braking force to a vehicle when a determination that a shift speed or a gear ratio of a transmission of a vehicle is changed to a shift speed or a gear ratio for a relatively low vehicle speed is made; and

a control device which controls a deceleration that is applied to the vehicle by the braking device, the deceleration being applied to a deceleration that is applied to the vehicle by performing a shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed.

2. The deceleration control system according to claim 1, wherein the deceleration added by the braking device is decided based on at least one of the shift speed or the gear ratio obtained after shifting performed by the shift operation, a type of shifting performed by the shift operation, whether jump shifting has been performed by the shift operation, and a speed of the vehicle.

3. The deceleration control system according to claim 1, wherein the control device performs control such that the deceleration that is applied to the vehicle by activating the braking device and performing the shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed becomes larger than the deceleration that is applied to the vehicle by only performing the shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed.

4. The deceleration control system according to claim 3, wherein the deceleration that is applied to the vehicle by activating the braking device and performing the shift operation is decided based on at least one of the shift speed or the gear ratio obtained after shifting performed by the shift operation, a type of shifting performed by the shift operation, whether jump shifting has been performed by the shift operation, and a speed of the vehicle.

5. The deceleration control system according to claim 1, wherein an application of the braking force, which is generated by the braking device, to the vehicle is controlled to be maintained even after the shift operation ends.

6. The deceleration control system according to claim 5, wherein the application of the braking force, which is generated by the braking device, to the vehicle is controlled to be maintained for a predetermined period after the shift operation ends, and the predetermined period is decided based on a running environment of the vehicle.

7. The deceleration control system according to claim 1, wherein the deceleration applied to the vehicle is decided based on a running environment of the vehicle.

8. A deceleration control method for a vehicle, comprising the steps of:

applying a braking force to a vehicle when a determination that a shift speed or a gear ratio of a transmission of a vehicle is changed to a shift speed or a gear ratio for a relatively low vehicle speed is made; and

controlling a deceleration that is applied to the vehicle by a braking device, the deceleration being added to a deceleration that is applied to the vehicle by performing a shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed.

9. The deceleration control method according to claim 8, wherein the deceleration added by the braking device is decided based on at least one of the shift speed or the gear ratio obtained after shifting performed by the shift operation, a type of shifting performed by the shift operation, whether jump shifting has been performed by the shift operation, and a speed of the vehicle.

10. The deceleration control method according to claim 8, wherein the deceleration that is applied to the vehicle by activating the braking device and performing the shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed is controlled such that the deceleration becomes larger than the deceleration that is applied to the vehicle by only performing the shift operation for changing the shift speed or the gear ratio of the transmission to the shift speed or the gear ratio for the relatively low vehicle speed.

11. The deceleration control method according to claim 10, wherein the deceleration that is applied to the vehicle by activating the braking device and performing the shift operation is decided based on at least one of the shift speed or the gear ratio obtained after shifting performed by the shift operation, a type of shifting performed by the shift operation, whether jump shifting has been performed by the shift operation, and a speed of the vehicle.

12. The deceleration control method according to claim 8, wherein an application of the braking force, which is generated by the braking device, to the vehicle is controlled to be maintained even after the shift operation ends.

13. The deceleration control method according to claim 12, wherein the application of the braking force, which is generated by the braking device, to the vehicle is controlled to be maintained for a predetermined period after the shift operation ends, and the predetermined period is decided based on a running environment of the vehicle.

14. The deceleration control method according to claim 8, wherein the deceleration applied to the vehicle is decided based on a running environment of the vehicle.