Control apparatus for vehicle and control program for vehicle

Patent metadata

Field	Value
Publication number	US-11912256-B2
Application number	US-202117455771-A
Country	US
Kind code	B2
Filing date	Nov 19, 2021
Priority date	Nov 27, 2020
Publication date	Feb 27, 2024
Grant date	Feb 27, 2024

Abstract

To suppress a sharp variation in the posture of a vehicle in a control apparatus that is configured to control the posture of the vehicle by adjusting a distribution ratio of a braking force between the front and rear during braking of the vehicle.The control apparatus includes a distribution setting unit that is configured to change the braking force distribution ratio from a basic braking force ratio during braking of the vehicle so that a posture of the vehicle follows a posture indicated by the target posture value. If the target posture value is varied when the braking force distribution ratio is different from the basic braking force ratio, the distribution setting unit sets the amount of change, by which the braking force distribution ratio is changed per unit time, equal to or smaller than a restriction amount.

First claim

The invention claimed is:

1. A control apparatus for a vehicle that is employed in a vehicle capable of adjusting a braking force distribution ratio which is a ratio for distributing a braking force to be applied on wheels at a time of braking the vehicle between a braking force to be applied on front wheels and a braking force to be applied on rear wheels, comprising:
a calculator that is configured to calculate, as a target posture value, a value indicating a target posture of the vehicle;
a distribution setting unit that is configured to change the braking force distribution ratio from a basic braking force ratio during braking of the vehicle so that a posture of the vehicle follows a posture indicated by the target posture value, the basic braking force ratio being a value of the braking force distribution ratio stored as a reference value for adjusting the braking force distribution ratio; and
a state judgment unit that is configured to judge whether or not the target posture value is varied, wherein
if the target posture value is varied when the braking force distribution ratio is different from the basic braking force ratio, the distribution setting unit sets an amount of change, by which the braking force distribution ratio is changed per unit time, equal to or smaller than a restriction amount, and
the state judgment unit divides an area of the target posture value into a first area of the target posture value, which indicates a target posture at the time when the vehicle is going straight, and a second area of the target posture value, which indicates a target posture at the time when the vehicle is turning, as areas of the target posture value for judging whether the target posture value is varied, and judges that the target posture value is varied if the target posture value moves from one of the first area and the second area to the other.

2. The control apparatus for the vehicle according to claim 1 , wherein the distribution setting unit sets the restriction amount to “0”.

3. The control apparatus for the vehicle according to claim 2 , wherein
the restriction amount is a first restriction amount,
the vehicle is capable of distributing a driving force of the vehicle to the front wheels and to the rear wheels, and
while a ratio for distributing the driving force of the vehicle between a driving force to be applied on the front wheels and a driving force to be applied on the rear wheels is set as a driving force distribution ratio, the distribution setting unit
changes, when the driving force is applied on the wheels, the driving force distribution ratio from a basic driving force ratio so that the posture of the vehicle follows the posture indicated by the target posture value, the basic driving force ratio being a value of the driving force distribution ratio stored as a reference value for adjusting the driving force distribution ratio, and
if the target posture value is varied when the driving force distribution ratio is different from the basic driving force ratio, the distribution setting unit sets the amount of change, by which the driving force distribution ratio is changed per unit time, equal to or smaller than a second restriction amount.

4. The control apparatus for the vehicle according to claim 3 , wherein the distribution setting unit sets the second restriction amount to “0”.

Assignees

• Advics Co Ltd

Inventors

• Muramatsu Sotaro
• Hashimoto Yosuke

Classifications

• B60T8/172 Primary

  Determining control parameters used in the regulation, e.g. by calculations involving measured or detected parameters {(B60T8/17551 takes precedence)} · CPC title

• B60T8/171

  Detecting parameters used in the regulation; Measuring values used in the regulation · CPC title

• B60T8/246

  Change of direction · CPC title

• B60T8/26

  characterised by producing differential braking between front and rear wheels {(using electrical circuitry or regulation means B60T8/17)} · CPC title

• B60T8/17551 Primary

  determining control parameters related to vehicle stability used in the regulation, e.g. by calculations involving measured or detected parameters · CPC title