Method for detecting a vehicle skidding
AssigneeJtekt Europe
InventorsYoann BAUDIN, Quentin FRAISON
Life of this patent
Estimating the term…
Abstract
Method (100) for detecting a loss of grip in a vehicle equipped comprising a power steering system, the method (100) comprising: at least one first measurement (101) by a first sensor configured to measure a first physical quantity representative of a driving direction defined by a driver 5 of the vehicle; at least one second measurement (102) by a second sensor configured to measure a second physical quantity representative of a vehicle response to the driving direction; a determination (103) of vehicle oversteer (SURV) or a vehicle understeer (SOUV) based on a criterion that is a function of at least one first measurement and at least one second measurement.
Claims8
A method for detecting a loss of grip in a vehicle comprising a power steering system, the method comprising:
- at least one first measurement by a first sensor configured to measure a first physical quantity representative of a driving direction defined by a driver of the vehicle;
- at least one second measurement by a second sensor configured to measure a second physical quantity representative of a vehicle response to the driving direction;
- a determination of vehicle oversteer or a vehicle understeer based on a criterion that is a function of the at least one first measurement and the at least one second measurement;
- in which the first physical quantity is a steering wheel rotation angle θsteering wheel of the vehicle;
- in which the second physical quantity is a lateral acceleration of the vehicle or a yaw rate {dot over (ψ)} of the vehicle;
- in which an equivalent steering wheel rotation θeq of the vehicle is determined based on the at least one second measurement;
- in which the criterion comprises the following conditions (1) and (2):
- (
- θ
- eq
- >
- 0
- )
- and
- (
- θ
- eq
- >
- θ
- steering
-
- wheel
- )
- ;
- (
- θ
- eq
- <
- 0
- )
- and
- (
- θ
- eq
- <
- θ
- steering
-
- wheel
- )
- ;
- the vehicle being determined to be oversteering if one of the conditions of the criterion is met, the vehicle being determined to be understeering if none of the conditions of the criterion are met;
- in which an oversteer rate is defined as the product of a maximum oversteer and an oversteer coefficient that is a function of the equivalent steering wheel rotation θeq and the steering wheel rotation angle θsteering wheel,
- in which the oversteer coefficient is a minimum of a first value and a second value, the first value being a first function K1 with an absolute value of the equivalent steering wheel rotation θeq, the second value being a second function K2 with an absolute value of the difference between the steering wheel rotation angle θsteering wheel and the equivalent steering wheel rotation θeq.
A method for detecting a loss of grip of a vehicle comprising a power steering system, the method comprising:
- at least one first measurement by a first sensor configured to measure a first physical quantity representative of a driving direction defined by a driver of the vehicle;
- at least one second measurement by a second sensor configured to measure a second physical quantity representative of a vehicle response to the driving direction;
- a determination of a vehicle oversteer or a vehicle understeer based on a criterion that is a function of the at least one first measurement and the at least one second measurement;
- in which the first physical quantity is a steering wheel rotation angle steering wheel of the vehicle;
- in which the second physical quantity is a lateral acceleration of the vehicle or a yaw rate {dot over (ψ)} of the vehicle;
- in which an equivalent steering wheel rotation θeq of the vehicle is determined based on the at least one second measurement;
- the criterion comprises the following conditions (1) and (2):
- (
- θ
- eq
- >
- 0
- )
- and
- (
- θ
- eq
- >
- θ
- steering
-
- wheel
- )
- ;
- (
- θ
- eq
- <
- 0
- )
- and
- (
- θ
- eq
- <
- θ
- steering
-
- wheel
- )
- ;
- the vehicle being determined to be oversteering if one of the conditions of the criterion is met, the vehicle being determined to be understeering if none of the conditions of the criterion are met;
- in which an understeer rate is defined as the product of a maximum understeer and an understeer coefficient that is a function of the equivalent steering wheel rotation θ eq and the steering wheel rotation angle θsteering wheel,
- in which the understeer coefficient is a minimum of a third and a fourth value, the third value being a third function K3 with an absolute value of the equivalent steering wheel rotation θeq, the fourth value being a fourth function K4 with an absolute value of a difference between the steering wheel rotation angle θsteering wheel and the equivalent steering wheel rotation θeq.
Dependencies are inferred from the claim text.