Verfahren zur Bestimmung von Fahrwegbedingungen bei ungebremster oder gebremster Fahrt eines Fahrzeugs

• Main Authors: Kerber, Henning, Burkhard, Dieter, Roszyk, Mario
• Format: Patent
• Language: German
• Published: 30.03.2023
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS INVEHICLES; ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OFTRANSMISSIONS IN VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GASEXHAUST OR FUEL SUPPLY OF PROPULSION UNITS, IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

Verfahren zur Bestimmung von Fahrwegbedingungen bei ungebremster oder gebremster Fahrt eines Fahrzeugs mittels einer radindividuellen Kenngröße, welche aus einer zeitlichen Änderung von an mindestens einem Fahrzeugrad erfassten Radgeschwindigkeit (φ̇) abgeleitet wird, dadurch gekennzeichnet, dassa) ein Rucksignal (j) durch zweifache Differentiation der Radgeschwindigkeit (φ̇) gebildet wird,b) zur Bildung der Kenngröße (SSchwing) die Differenz aus dem Absolutwert (|j|) des Rucksignals (j) und eines Toleranzwertes jToleranz) über die Zeit aufsummiert oder integriert wird, undc) durch Vergleich der Kenngröße (SSchwing) mit einem Schwingsignalschwellwert (Ggrenz) die Fahrwegbedingung ermittelt wird. A method for determining the conditions of an underlying surface during unbraked or braked travel of a vehicle by a wheel-specific characteristic variable which is derived from a change over time in the wheel speed detected at at least one vehicle wheel. According to invention there is provision that a) a jolt signal is formed by double differentiation of the wheel speed, b) in order to form the characteristic variable the difference between the absolute value of the jolt signal and a tolerance value is summed or integrated over time, and c) the condition of the underlying surface is determined by comparing the characteristic variable with an oscillation signal threshold value.