Vehicle driving-torque control device

Patent metadata

Field	Value
Publication number	US-2016185336-A1
Application number	US-201314650752-A
Country	US
Kind code	A1
Filing date	Nov 26, 2013
Priority date	Dec 12, 2012
Publication date	Jun 30, 2016
Grant date	—

Abstract

A vehicular driving torque control apparatus, comprising: a limitation variation rate setting section included in a driving torque control section and configured to set, in a form of a limitation variation rate, a low torque side limitation variation rate used in a low torque side until the target driving torque reaches to a torque variation rate switching threshold value and a high torque side limitation variation rate used in a high torque side exceeding the torque variation rate switching threshold value and to execute a limitation suppression variation rate setting process in which the low torque side limitation variation rate is set to be larger than the high torque side limitation variation rate until the target driving torque reaches to the torque variation rate switching threshold value.

First claim

1 .- 8 . (canceled)

9 . A vehicular driving torque control apparatus, comprising:
a driving torque control section configured to control a driving torque of a vehicular power source in accordance with a target driving torque in a traveling state; a variation rate limiting section included in the driving torque control section and configured to execute an increase variation rate limiting process in which a variation rate of the target driving torque at a time of an increase in the target driving torque is limited not to exceed a limitation variation rate; and a limitation variation rate setting section included in the driving torque control section and configured to set, in a form of the limitation variation rate, a low torque side limitation variation rate used in a low torque side until the target driving torque reaches to a torque variation rate switching threshold value and a high torque side limitation variation rate used in a high torque side exceeding the torque variation rate switching threshold value and to execute a limitation suppression variation rate setting process in which the low torque side limitation variation rate is set to be larger than the high torque side limitation variation rate until the target driving torque reaches to the torque variation rate switching threshold value.

10 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the limitation variation rate setting section sets the low torque side limitation variation rate in a case where an accelerator opening angle is larger than a preset accelerator opening angle threshold value to be larger than the low torque side limitation variation rate in a case where the accelerator opening angle is smaller than the accelerator opening angle threshold value on a basis of the limitation suppression variation rate setting process.

11 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the torque variation rate switching threshold value is set in accordance with at least one of a gear ratio of a transmission and a vehicle speed and is set to be larger as a higher gear stage or a higher vehicle speed.

12 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the low torque side limitation variation rate is set in accordance with at least one of a gear ratio of a transmission and a vehicle speed and is set to be larger as a higher gear stage or a higher vehicle speed.

13 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the limitation variation rate setting section sets the low torque side limitation variation rate in a case where an accelerator opening angle variation quantity is larger than a preset variation quantity threshold value to be larger than the low torque side limitation variation rate in a case where the accelerator opening angle variation quantity is smaller than the variation quantity threshold value on a basis of the limitation suppression variation rate setting process.

14 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the limitation variation rate setting section sets the low torque side limitation variation rate in a case where the target driving torque is larger than a preset target driving torque threshold value to be larger than the low torque side limitation variation rate in a case where the target driving torque is smaller than the target driving torque threshold value on a basis of the limitation suppression variation rate setting process.

15 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the driving torque control section comprises a gear backlash eliminating torque limitation control section configured to execute a gear backlash eliminating torque limitation process in which an input torque to a transmission is limited to a gear backlash eliminating torque set to be smaller than the target driving torque but set to be larger than zero torque during a measurement end of a preset gear backlash eliminating time required for a driving force transmission system of a driving wheel side from the transmission to be switched from a negative drive state to a positive drive state, when the target driving torque is switched from a negative torque to a positive torque, and the gear backlash eliminating torque limitation control section sets the gear backlash eliminating time to be varied in accordance with either one of the accelerator opening angle and the target driving torque and to be shorter as either one of the accelerator opening angle and the target driving torque becomes larger.

16 . The vehicular driving torque control apparatus as claimed in claim 9 , wherein the vehicular driving torque control apparatus comprises the gear backlash eliminating torque limitation control section described in claim 7 and the driving torque control section sets one of values of the target driving torque set by the variation rate limiting section and the gear backlash eliminating torque set by the gear backlash eliminating torque limitation control section which is smaller than the other to be the target driving torque.

17 . A vehicular driving torque control apparatus, comprising:
driving torque control means for controlling a driving torque of a vehicular power source in accordance with a target driving torque in a traveling state; variation rate limiting means included in the driving torque control means for executing an increase variation rate limiting process in which a variation rate of the target driving torque at a time of an increase in the target driving torque is limited not to exceed a limitation variation rate; and limitation variation rate setting means included in the driving torque control means for setting, in a form of the limitation variation rate, a low torque side limitation variation rate used in a low torque side until the target driving torque reaches to a torque variation rate switching threshold value and a high torque side limitation variation rate used in a high torque side exceeding the torque variation rate switching threshold value and for executing a limitation suppression variation rate setting process in which the low torque side limitation variation rate is set to be larger than the high torque side limitation variation rate until the target driving torque reaches to the torque variation rate switching threshold value.

18 . A vehicular driving torque control method, comprising:
controlling a driving torque of a vehicular power source in accordance with a target driving torque in a traveling state; executing an increase variation rate limiting process in which a variation rate of the target driving torque at a time of an increase in the target driving torque is limited not to exceed a limitation variation rate; setting, in a form of the limitation variation rate, a low torque side limitation variation rate used in a low torque side until the target driving torque reaches to a torque variation rate switching threshold value and a high torque side limitation variation rate used in a high torque side exceeding the torque variation rate switching threshold value; and executing a limitation suppression variation rate setting process in which the low torque side limitation variation rate is set to be larger than the high torque side limitation variation rate until the target driving torque reaches to the torque variation rate switching threshold value.

Assignees

• Nissan Motor

Inventors

• Ueno Munetoshi
• Amemiya Jun
• Kudo Noboru

Classifications

• B60W2520/10

  Longitudinal speed · CPC title

• F02D11/105

  characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque · CPC title

• F02N11/0822

  related to action of the driver · CPC title

• B60W10/115

  with planetary gears · CPC title

• B60L15/20

  for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed · CPC title