Vehicle control system

• US 8,676,464 B2
• Filed: 03/18/2011
• Issued: 03/18/2014
• Est. Priority Date: 09/29/2010
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Shimura, Soichiro, Matsunaga, Hitoshi, Okumura, Kazuya
• Primary Examiner(s): Trammell, James
• Assistant Examiner(s): SMITH-STEWART, DEMETRA R
• Application Number:
  US13/579,659
• Publication Number:
  US 20120316744A1
• Time in Patent Office: 1,096 Days
• Field of Search: None
• US Class Current: 701/72
• CPC Class Codes: B60T 2201/16 Curve braking control, e.g. turn control within ABS control algorithm
• CPC Class Codes: B60T 2270/303 Stability control with active acceleration
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 2520/125 Lateral acceleration
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: B60W 30/02 Control of vehicle driving stability
• CPC Class Codes: F02D 29/02 peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers

Abstract

A vehicle control system configured to stabilize a behavior of a vehicle during turning by correcting a driving force or a braking force. The vehicle control system comprises a lateral acceleration detecting means detecting longitudinal acceleration acting in an axle direction of the vehicle Ve (step S102); and a driving/braking force correcting means determining a changing amount Fctrl and a changing rate DFctrl of the correction based on the lateral acceleration Gy in case the running vehicle Ve is turned.

Claims

1. A vehicle control system, which is configured to stabilize a behavior of a vehicle during turning by carrying out a correction to change a driving force or a braking force, comprising:

at least one of a lateral acceleration detecting means, which is configured to detect a lateral acceleration acting in an axle direction of the vehicle, and a lateral jerk detecting means, which is configured to detect a lateral jerk acting in an axle direction of the vehicle; and

a driving/braking force correcting means, which is configured to determine a maximum changing rate of the correction with respect to a changing amount of the correction based on the lateral acceleration or the lateral jerk in case of turning the vehicle, within a region determined in advance where a driver does not feel an uncomfortable feeling,

wherein the driving/braking force correcting means includes a means configured to increase upper limit values of the changing amount and the changing rate in accordance with an increase in the lateral acceleration or the lateral jerk.

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

wherein the driving/braking force correcting means includes a means configured to revise the changing amount and the changing rate to limit those values within a predetermined target region determined taking into consideration a control response to carry out the correction.

3. The vehicle control system as claimed in claim 2,

wherein the driving/braking force correcting means includes a means configured to revise the changing amount to reduce while revising the changing rate to increase.

4. The vehicle control system as claimed in claim 1, further comprising:

a longitudinal acceleration detecting means, which detects a longitudinal acceleration of the vehicle;

a differential threshold determining means, which is configured to determine a differential threshold to judge whether or not the driver feels an uncomfortable feeling when carrying out the correction, by approximating the differential threshold to a predetermined continuous curve on a coordinate system composed of coordinate axes representing a changing amount of the longitudinal acceleration of the correction and a changing rate of the longitudinal acceleration of the correction; and

the driving/braking force correcting means includes a means configured to determine the changing amount of the longitudinal acceleration and the changing rate of the longitudinal acceleration in a manner to limit those values within the region where the driver does not feel an uncomfortable feeling by the differential threshold.

5. The vehicle control system as claimed in claim 4,

wherein the curve includes a hyperbolic curve extending along a linear asymptotic line representing the predetermined changing amount of the longitudinal acceleration and a linear asymptotic line representing the predetermined changing rate of the longitudinal acceleration.

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

wherein the differential threshold determining means includes a means configured to calculate the predetermined changing amount of the longitudinal acceleration and the predetermined changing rate of the longitudinal acceleration of the asymptotic lines based on the lateral acceleration and/or lateral jerk.

7. A vehicle control system, which is configured to stabilize a behavior of a vehicle during turning by carrying out a correction to change a driving force or a braking force, comprising:

one of a lateral acceleration detector, which is configured to detect a lateral acceleration acting in an axle direction of the vehicle and a lateral jerk detector, which is configured to detect a lateral jerk acting in an axle direction of the vehicle; and

a driving/braking force corrector, which is configured to determine a maximum changing rate of the correction with respect to a changing amount of the correction based on the lateral acceleration or the lateral jerk in case of turning the vehicle, within a region determined in advance where a driver does not feel an uncomfortable feeling;

wherein the driving/braking force corrector includes a corrector configured to increase upper limit values of the changing amount and the changing rate in accordance with an increase in the lateral acceleration or the lateral jerk.