Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Indication or control of braking – acceleration – or deceleration
Patent
1998-05-04
2000-01-04
Louis-Jacques, Jacques H.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Indication or control of braking, acceleration, or deceleration
701 83, 701 91, 701 70, 303186, 303189, 303901, G06F 700
Patent
active
06012010&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a method of improving the control behavior of an anti-lock control system, more particularly, the steerability of a vehicle and its drivability during cornering, wherein the rotational behavior of the vehicle wheels is measured and evaluated to determine a vehicle reference speed which is used as a reference value for ascertaining the wheel slip and for braking pressure modulation, and wherein criteria for cornering identification and for identification of the direction of cornering are derived from the wheel slip of the individual wheels.
German patent No. 34 13 738 discloses an anti-lock control system (ABS) including a cornering identification circuit which is also based on measuring the wheel slip. For cornering identification, the slip values on the wheels of one vehicle side are added and compared with the slip sum of the wheels of the other vehicle side. A cornering identification signal is produced as soon as the difference of the slip sums exceeds a predetermined limit value. When cornering is identified, selection criteria, such as "select-low" or "select-high", by which the pressure variation in the individual braking pressure control channels of the brake system is controlled, and limit values for activation of the selection criteria are varied. The objective is to adapt the control to the different conditions during straight travel and cornering.
The older German patent application No. 21 19 590 teaches producing a cornering identification signal by means of a transverse acceleration measuring device, for example, a mercury switch.
The object of the present invention is also to provide an improved control of an anti-lock control system (ABS) or a brake slip control system by adapting the control to the different conditions during straight travel and cornering. A special objective is to improve the steerability of the vehicle and its driving stability during cornering.
SUMMARY OF THE INVENTION
It has been found that this object can be achieved by a method of the type described hereinabove, the special features of which involve that, when cornering is identified, the normal control mode which is intended for straight travel and is configured for an individual control of all wheels or an individual control of the front wheels in conjunction with a select-low control of the rear wheels is changed to a cornering control mode, wherein in comparison to the normal control mode, the average pressure level of the curve-inward front wheel is decreased by a predetermined value and the average pressure level of the curve-outward front wheel is increased by a predetermined value. In general (even though not in all cases), the amount of decrease on the curve-inward wheel should correspond to the amount of increase on the second wheel of this axle.
The concept underlying the present invention is that the desired improvement of the control behavior which equally ensures enhanced steerability and driving stability and a high braking effect, namely the attaining of a minimum short stopping distance, can be achieved by taking into account the interaction of the longitudinal and cornering forces on all wheels. Taking into account the longitudinal and cornering forces for each individual wheel is not successful. Instead, according to the present invention, influencing the longitudinal and cornering forces on the wheels is utilized to develop an understeering yawing torque which counteracts oversteering of the vehicle caused by cornering. Oversteering is due to the fact that the centrifugal force--due to an insufficient axle load or due to drive effects and brake slip--cannot be supported by the sum of all lateral forces. Therefore, according to the present invention, a special control mode is activated when cornering is identified to correct the average pressure level on the curve-inward and the curve-outward wheels (or only of the front wheels) in the described fashion.
In a preferred aspect of the method of the present invention, the amount of decre
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Batistic Ivica
Buttner Hans-Joachim
Fennel Helmut
Arthur Gertrude
ITT Manufacturing Enterprises Inc.
Louis-Jacques Jacques H.
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