Vehicle control system

• US 9,290,175 B2
• Filed: 09/06/2013
• Issued: 03/22/2016
• Est. Priority Date: 09/19/2012
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Matsunaga, Hitoshi, Yoshikawa, Hayato
• Primary Examiner(s): PANG, ROGER L
• Application Number:
  US14/428,676
• Publication Number:
  US 20150239469A1
• Time in Patent Office: 928 Days
• Field of Search: 701/55, 701/56, 701/62, 477/115, 477/125
• US Class Current: 1/1
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/115 with planetary gears
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2710/1005 Transmission ratio engaged
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: B60W 30/045 Improving turning performance
• CPC Class Codes: F16H 2061/0223 Generating of new shift maps, i.e. methods for determining shift points for a schedule by taking into account driveline and vehicle conditions
• CPC Class Codes: F16H 2061/0225 Modifying of shift maps by manual control, e.g. by learning values from the driver during manual shift mode
• CPC Class Codes: F16H 2061/0227 Shift map selection, i.e. methods for controlling selection between different shift maps, e.g. to initiate switch to a map for up-hill driving
• CPC Class Codes: F16H 2061/0234 Adapting the ratios to special vehicle conditions
• CPC Class Codes: F16H 2061/163 Holding the gear for delaying gear shifts under unfavorable conditions, e.g. during cornering
• CPC Class Codes: F16H 59/18 dependent on the position of the accelerator pedal
• CPC Class Codes: F16H 59/54 dependent on signals from the brakes, e.g. parking brakes
• CPC Class Codes: F16H 59/58 dependent on signals from the steering
• CPC Class Codes: F16H 61/02 characterised by the signals used for shift actuators F16H61/28, for continuously variable gearings F16H61/66
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 61/10 Controlling shift hysteresis

Abstract

A vehicle control system is provided to control driving force to improve turning performance in a vehicle having an automatic transmission without causing conflict with a shifting control of the transmission. The vehicle control system comprises: a shifting means that carries out a shifting operation of the transmission based on an execution condition including an execution threshold governed by a vehicle speed and an operating amount of an accelerator performed by a driver; a driving force controlling means that carries out a turning performance improving control for stabilizing a vehicle behavior by controlling a driving force during turning; and a shifting condition correcting means that corrects a value of the operating amount of the accelerator as the execution condition during execution of the turning performance improving control.

Claims

1. A vehicle control system that is applied to a vehicle having an automatic transmission disposed between a prime mover and drive wheels, comprising:

a shifting means that carries out a shifting operation of the transmission based on an execution condition including an execution threshold governed by a vehicle speed and an operating amount of an accelerator performed by a driver;

a driving force controlling means that carries out a turning performance improving control for stabilizing a vehicle behavior by controlling a driving force during turning;

a shifting condition correcting means that corrects a value of the operating amount of the accelerator as the execution condition during execution of the turning performance improving control;

a shifting probability determining means that determines a threshold of an amount of change in the driving force or the operating amount of the accelerator corresponding to the amount of change in the driving force resulting from executing the turning performance improving control, for determining probability that the shifting operation of the transmission will be caused when an operating condition of the vehicle satisfies the execution condition of the shifting operation; and

wherein the shifting condition correcting means includes a means configured to inhibit the correction of the value of the operating amount of the accelerator if the amount of change in the driving force or the operating amount of the accelerator corresponding thereto is smaller than the threshold.

2. The vehicle control system as claimed in claim 1, wherein the shifting probability determining means includes a means configured to determine the threshold based on an amount of change in the driving force required for the operating condition of the vehicle to satisfy the execution condition of the shifting operation.

3. The vehicle control system as claimed in claim 1, wherein the shifting condition correcting means includes a means configured to increase the value of the operating amount of the accelerator if the driving force is reduced by the turning performance improving control.

4. The vehicle control system as claimed in claim 1, wherein the shifting condition correcting means includes a means configured to decrease the value of the operating amount of the accelerator if the driving force is increased by the turning performance improving control.

5. The vehicle control system as claimed in claim 1,

wherein the shifting means includes a means configured to determine another execution threshold of the operating amount of the accelerator or an operating rate of the accelerator for carrying out the shifting operation in addition to said execution threshold, and to carry out a downshifting of the transmission if the operating amount of the accelerator or the operating rate of the accelerator is larger than said another execution threshold;

and

wherein the shifting condition correcting means includes a means configured to correct said another execution threshold in a manner such that the downshifting is prevented during execution of the turning performance improving control.