A process for anti-lock control on a racing vehicle having an aerodynamic design which results, at high speeds, in a clear increase both of the front-axle load and the rear-axle load of the vehicle. On a wheel requiring control, the response of the anti-lock control is triggered in the direction of
A process for anti-lock control on a racing vehicle having an aerodynamic design which results, at high speeds, in a clear increase both of the front-axle load and the rear-axle load of the vehicle. On a wheel requiring control, the response of the anti-lock control is triggered in the direction of a brake-pressure reduction when an axle-related reference quantity Kh or Kv, formed as a sum of weighted amounts of the wheel-circumference deceleration Z and of the brake slip of the respective vehicle wheel related to a reference speed, exceeds a threshold value. At least during the formation of the reference quantity critical for the front axle, the reciprocal value of the locking limit, determined with inclusion of negative lift forces and air resistance, of the vehicle wheels, plus a safety value Do, is taken as a weighting factor Xv. Within the framework of an anti-lock system suitable for carrying out the process, a brake unit switchable to different values of the brake-force distribution under the control of its electronic control unit is provided.
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A process for anti-lock control on a high-speed aerodynamically-designed road vehicle in which, at high speeds, a clear increase both of the front-axle load and of the rear-axle load of the vehicle results, provided that Xv, Xh and Y are weighting factors, and mv is an adhesion coefficient on a fron
A process for anti-lock control on a high-speed aerodynamically-designed road vehicle in which, at high speeds, a clear increase both of the front-axle load and of the rear-axle load of the vehicle results, provided that Xv, Xh and Y are weighting factors, and mv is an adhesion coefficient on a front axle, mh is an adhesion coefficient on a rear-axle, cYFVA is a negative lift coefficient on the front axle, KNA is a negative lift coefficient on the rear axle, Kw is a coefficient of air resistance, G is the vehicle weight (N), lmaxv is the maximum possible brake slip on the front wheels lmaxh is the maximum permissible brake slip on the rear wheels, Do is a safety value of approximately 0.3, Zv is wheel-circumference deceleration of the front wheels, Zh is wheel-circumference deceleration of the rear wheels, lv is a brake slip of the front wheel, lh is a brake slip of the rear wheel, v is vehicle speed [Figure] [Figure] comprising the steps of comparing deceleration of front and rear wheels of the vehicle with a threshold value by generating axle-related reference quantities, Kv and Kh, of the front and rear axles, respectively, as a sum of weighted amounts of the wheel-circumference decelerations Zv and Zh, respectively, and the brake slip lv and lh, respectively, in relation to a reference speed in accordance with the relationship Kv=XvㆍZv-Yㆍlv and Kh=XnㆍZh-Yㆍlh, standardizing the weighting factors Xv, Xh and Y in such a way that Xv(Zmaxv+Do)=1 and Xhㆍ(Zmaxh+Do)=1, and Yㆍlmaxv=1 and Yㆍlmaxh=1, determining maximum values, Zmaxv and Zmaxh, of the wheel-circumference decelerations of the front and rear wheels, respectively, linked to the highest possible vehicle deceleration taking into account air force on the front and rear axles, according to the relationships [Figure] [Figure] reducing, as a function of the vehicle speed (v), the weighting factors of the deceleration Zv and ZE according to the following X=Xo-bㆍv, under the secondary conditions that [Figure] triggering response of the anti-lock control in a direction of a brake-pressure reduction on a wheel brake of a wheel requiring control when the axle-related reference quantities, Kv and Khexceed an axle-related threshold value which is compatible with a stable dynamic behavior of the vehicle while ensuring a high value of the wheel deceleration; and modulating the brake pressure to selectively increase and decrease the front-axle brake force and the rear axle brake force to effect controlled braking at high decelerations with the road vehicle at maximum speed.
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