Method and apparatus for the evaluation of wheel speed data in a motor vehicle

• Main Authors: BERNHARD MILLER, EBERHARDT SCHUNCK
• Format: Patent
• Language: English
• Published: 02.03.1994
• Edition: 5
• 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 FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS; 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; DEVICES OR ARRANGEMENTS RELATED TO TYRES; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; MEASURING; MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER,MECHANICAL EFFICIENCY, OR FLUID PRESSURE; MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION,OR SHOCK; MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR; MOTOR VEHICLES; PERFORMING OPERATIONS; PHYSICS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; REPAIRING, OR CONNECTING VALVES TO, INFLATABLE ELASTIC BODIESIN GENERAL; TARIFF METERING APPARATUS; TESTING; TRAILERS; TRANSPORTING; TYRE CHANGING OR REPAIRING; TYRE INFLATION; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLE SUSPENSION ARRANGEMENTS; VEHICLE TYRES; VEHICLES IN GENERAL

A method of evaluating wheel speed data in a two-axle motor vehicle comprises detecting first signals (nvl, nvr, nhl, nhr) representing the rotational speed of the wheels and determining, from the first signals, second signals (delta nv) and third signals (delta nh) representing the difference between the wheel speeds of the vehicle axles. Fourth signals (Zarvl, Zarvr, Zarhl, Zarhr) representing the relative movements between the vehicle chassis and the wheels (spring stroke travels) are also detected and are processed, preferably by means of characteristic value fields (1001v, 1001h) into correction values (Corv, Corh) for the second and third signals or for values (delta nv', delta nh') obtained by low-pass filtering thereof. By this method, different states of loading of the vehicle and non-linearities in the suspension systems can be taken into consideration in further processing of the wheel speed signals, for example for the determination of tyre state or steering angle.