Abstract: In a method for detecting a deviation of a compression pressure of one cylinder from that of another cylinder of an internal combustion engine having at least two cylinders, the rotational speed of a crankshaft of the internal combustion engine is reduced from a starting rotational speed to a target rotational speed; the actual rotational speed is detected; a curve of a change of the actual rotational speed per angle unit of the crankshaft is determined as a curve of a rotational speed gradient; the curve of the rotational speed gradient is subjected to order analysis; and a deviation of the compression pressure of one cylinder from that of another cylinder is detected when an amplitude of a selected order lies above a permissible threshold value.

Abstract: A calibration device is described for calibrating a scatterometer, which is designed in particular for measuring a particle concentration in exhaust gases of motor vehicles. The calibration device has at least one scattering body which emits scattered light having a defined intensity and distribution when irradiated with a light beam, the scattering body having an emission surface for the scattered light, to which is assigned at least one light sensor for detecting the scattered light exiting the emission surface. A screening body having at least one screen opening through which the scattered light exits in the direction of the at least one light sensor is assigned to the emission surface of the scattering body.

Abstract: A method for detecting the shape or dimensions of a wheel on vehicle repair workshop machines comprises the stages of: projection of a line of light onto the surface of a portion of a wheel (3) mounted rotating on a vehicle repair workshop machine; acquisition of at least a two-dimensional image of the projected line of light; processing the acquired image to determine the profile of the portion of the wheel; at least two stages of complete rotation of the wheel; and a distributed detection stage, wherein the projection stage and acquisition stage are performed in correspondence to first angular positions of the wheel during the first rotation stage, and in correspondence to second angular positions of the wheel during the second rotation stages, the first angular positions and the second angular positions being at least partially distinct the one from the other.

Abstract: In a method for detecting a deviation of a compression pressure of one cylinder from that of another cylinder of an internal combustion engine having at least two cylinders, the rotational speed of a crankshaft of the internal combustion engine is reduced from a starting rotational speed to a target rotational speed; the actual rotational speed is detected; a curve of a change of the actual rotational speed per angle unit of the crankshaft is determined as a curve of a rotational speed gradient; the curve of the rotational speed gradient is subjected to order analysis; and a deviation of the compression pressure of one cylinder from that of another cylinder is detected when an amplitude of a selected order lies above a permissible threshold value.

Abstract: A calibration device is described for calibrating a scatterometer, which is designed in particular for measuring a particle concentration in exhaust gases of motor vehicles. The calibration device has at least one scattering body which emits scattered light having a defined intensity and distribution when irradiated with a light beam, the scattering body having an emission surface for the scattered light, to which is assigned at least one light sensor for detecting the scattered light exiting the emission surface. A screening body having at least one screen opening through which the scattered light exits in the direction of the at least one light sensor is assigned to the emission surface of the scattering body.

Abstract: A device for measuring the particle concentration in an aerosol using a flow tube includes a cavity in which there is a sleeve, the cavity branching off from the flow tube. The sleeve includes, at its end facing away from the flow tube, a collar. The collar encircles the periphery of the sleeve and is fastened at the periphery of the cavity. There is one or more inflow openings in the collar. At least one outflow opening is in an end of the sleeve, which end extends into the flow tube. A measuring chamber is also included in the cavity on the side of the sleeve facing away from the flow tube.

Abstract: The method (M) for detecting the shape and/or dimensions of a wheel (3) on vehicle repair workshop machines or the like comprises the stages of: projection (B1, B2) of a line of light (6) onto the surface of a portion of a wheel (3) mounted rotating on a vehicle repair workshop machine (1) or the like; acquisition (C1, C2) of at least a two-dimensional image (Ii) of the projected line of light (6); processing (F) of the acquired image (Ii) to determine the profile (Pi) of the portion of the wheel (3); at least two stages (D1, D2) of complete rotation of the wheel (3); and a distributed detection stage (A), wherein the projection stage (B1, B2) and acquisition stage (C1, C2) are performed in correspondence to first angular positions (?j) of the wheel (3) during the first rotation stage (D1), and in correspondence to second angular positions (?k) of the wheel (3) during the second rotation stages (D2), at least some of the first angular positions (?j) and the second angular positions (?k) being non-coincident.

Abstract: The tire-changing machine for fitting and removing vehicle wheels comprises a base frame for supporting gripping and rotating means for a vehicle wheel with a rim and a tire to be fitted/removed, an operating head operatively associated with the base frame and having at least a fitting/removal tool, operating means or actuators suitable for positioning the operating head in a work configuration in which the tool is arranged in contact against the tire substantially near the flange of the rim. The actuators are responsive to a processing and control unit which positions the operating head in the work configuration, so that the fitting/removal tools can fit, and/or remove, a tire from the rim of a vehicle wheel.

Abstract: The method for correcting the eccentricity of a vehicle wheel in balancing machines or the like, comprises: a reading phase for reading the radial eccentricity deviation of the rim of a wheel to be balanced and the radial eccentricity deviation of the tire of the wheel, read at a plurality of predetermined angular positions along the entire outer perimeter of the rim and of the tire; a processing phase of the total radial eccentricity deviation values of the wheel, starting with the radial eccentricity deviations of the rim and of the tire read and according to the angular coupling positions between the rim and the tire; a definition phase for defining a geometric irregularity index of the wheel, determined according to the total radial eccentricity deviation values of the wheel and according to the angular coupling position between the rim and the tire; a determination phase for determining an optimal coupling angular position between the tire and the rim, selected among all the possible angular coupling pos

Abstract: The tire-changing machine for fitting and removing vehicle wheels comprises a base frame for supporting gripping and rotating means for a vehicle wheel with a rim and a tire to be fitted/removed, an operating head operatively associated with the base frame and having at least a fitting/removal tool, operating means or actuators suitable for positioning the operating head in a work configuration in which the tool is arranged in contact against the tire substantially near the flange of the rim. The actuators are responsive to a processing and control unit which positions the operating head in the work configuration, so that the fitting/removal tools can fit, and/or remove, a tire from the rim of a vehicle wheel.

Abstract: The method for correcting the eccentricity of a vehicle wheel in balancing machines or the like, comprises: a reading phase for reading the radial eccentricity deviation of the rim of a wheel to be balanced and the radial eccentricity deviation of the tire of the wheel, read at a plurality of predetermined angular positions along the entire outer perimeter of the rim and of the tire; a processing phase of the total radial eccentricity deviation values of the wheel, starting with the radial eccentricity deviations of the rim and of the tire read and according to the angular coupling positions between the rim and the tire; a definition phase for defining a geometric irregularity index of the wheel, determined according to the total radial eccentricity deviation values of the wheel and according to the angular coupling position between the rim and the tire; a determination phase for determining an optimal coupling angular position between the tire and the rim, selected among all the possible angular coupling pos