Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Reexamination Certificate
1999-05-24
2001-08-07
Zanelli, Michael J. (Department: 3661)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
Reexamination Certificate
active
06272419
ABSTRACT:
TECHNICAL FIELD
This invention relates to a method for controlling the behaviour of an automotive vehicle during cornering and to a braking system for implementing such a method.
More particularly, the present invention concerns a method wherein, using the wheel speed of the vehicle, the hydraulic brake pressure available to the wheel brakes is modified according to intended road-holding qualities.
BACKGROUND OF THE INVENTION
Some widely known types of vehicles are provided with an Anti-Lock Braking System (ABS), and with a Dynamic Rear Proportioning System (DRP) integrated within the ABS to perform the function of brake pressure proportioning between the front and rear brakes in order to provide the optimum brake force balance throughout the brake manoeuvre to enhance the performance of the braking system and to optimise the vehicle stability.
This type of braking system is quite efficient while the vehicle is moving in a substantial linear pathway, but is prone to be less accurate during cornering, due to the fact that the regulation of the braking balance is carried out using the front and rear wheel speed differential value which may not be high enough, during cornering, to generate a consistent data.
SUMMARY OF THE INVENTION
In view of the above problem, it is an object of the invention to provide a method for controlling the behaviour of a vehicle during cornering, capable, on the one hand, to enhance the braking performance, and on the other hand, to optimise the vehicle stability.
Another object of the invention is to provide a braking system carrying out the above method.
For this purpose, the present invention provide a method for controlling the behaviour of an automotive vehicle during cornering consisting in measuring the rotational wheel speed of the front and rear wheels of the vehicle, establishing the wheel speed difference between the front and rear wheels and modifying the brake pressure applied to the rear wheel brakes of the vehicle according to a vehicle behaviour to be obtained, comprising the steps of:
elaborating a function of the absolute value of the wheel speed difference between the inner front wheel and the outer rear wheel, considering the cornering direction, and
using said function to determine the brake pressure variations to be applied to the rear wheel brakes.
Further, the invention provides a braking system intended to implement the above method, said system including Dynamic Rear Proportioning means and further comprises:
measuring means for measuring the inner front wheel speed and the outer rear wheel speed, considering the cornering direction,
means for establishing the absolute value of the difference between the inner front wheel speed and the outer rear wheel speed,
control means for controlling the brake pressure applied to the vehicle rear wheel brakes, and
computing means for calculating a function of the absolute value of the difference between the inner front wheel speed and the outer rear wheel speed, said computing means being connected to said measuring means and said control means in order to modify the brake pressure applied to the rear wheel brakes using said function, according to the vehicle behaviour to be obtained.
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Delplace Remy
Groult Xavier Marie
Delphi Technologies INC
Sigler Robert M.
Zanelli Michael J.
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