Abstract: A method to estimate real-time exhaust pressure in a compression ignition engine with variable geometry turbocharger and an EGR by adding the turbocharger RPM, the engine RPM, EGR value position and intake manifold pressure to determine a final turbocharger turbine inlet pressure to control NOx emissions.

Abstract: Disclosed is a method for diagnosing the function of a level control system (1) of a motor vehicle, comprising at least one valve (2a, 2b, 14, 26) and a control unit (10). An exchange of pressure medium from one side of the valve to the other side of the valve is possible when the valve is open, and an exchange of pressure medium is prevented when the valve is closed. The valve carries out a change of state, a variable (4, I) influencing the valve output is measured during the change of state, the measured variable influencing the output of the valve is compared with a reference curve, a family of characteristics or a limit value in the control unit (10), and based on the comparison in the control unit (10) it can be established if the valve has carried out the change of state.

Abstract: An method of synchronizing a signal coming from at least one sensor positioned on an engine with a periodic event of the engine such as the crankshaft rotation is disclosed having application for engine control. A crankshaft rotation signal indicative of a reference time (TR), with which the engine signal(s) is to be synchronized, is acquired. The effective time difference (D) between the reference time and the time that is the closest to each temporally acquired engine signal is measured. Then the coefficients of a fractional digital compensation filter (FSDF) for compensating for the fractional part (d) of the measured effective time difference are determined. Finally, this digital compensation filter is applied to each temporally sampled engine signal, allowing obtaining of a series of digitized samples resealed from reference time (TR) for each engine signal.

Abstract: One aspect of the invention is directed to a suspension and weigh system for use with a vehicle having weight bearing members. The system has a support connectable to the weight bearing members of the vehicle. The support has a length and a neutral axis along at least a portion of the length. A weigh system is coupled to the support and configured to measure and/or determine weight carried by the weight bearing members. The weigh system has a load sensor attached to the support and positioned substantially adjacent to the neutral axis. A data processor is coupled to the load sensor and configured to receive the output signal from the load sensor for determining the weight carried by the axles. In one embodiment, a display is coupled to the data processor and configured to display data related to the weight carried by the axles.

Abstract: The invention relates to a suspension system for a vehicle wheel suspension having a first spring element (1) in the end clamped between the vehicle body (11) and a vehicle wheel (12,12?) and a second or additional spring element (2,3) which in the end can be clamped between the vehicle body (11) and the vehicle wheel (12,12?) by the introduction of a tensile force by means of a mechanical tensioning element (4,5,6,20), which spring element (2,3) can thereby be connected parallel to the first spring element (1), while this additional spring element (2,3) is not active without tensile force introduced into the system, and furthermore having a pressure addition spring element (29) which, in the case of large spring excursions of the first spring element (1), becomes active by way of an end stop. In this case, the pressure addition spring element (29) is not activated with the introduction of the tensile force for activating the second or additional spring element (2).

Abstract: An apparatus for testing a vehicle. The apparatus includes an actuator and a stand assembly supported by the actuator. The stand assembly includes a coupling device configured to attach to a vehicle, and the actuator is configured to move the vehicle in response to a computer-generated signal.

Abstract: Disclosed is a method for detecting leaks in an air spring arrangement (1) in a motor vehicle, having a ride level control device which has a plurality of air springs (2a, 2b, 2c, 2d), devices (5a, 5b, 5c, 5d, 6, 12, 14a, 14b, 14c, 14d) for determining the total quantity of air in the air spring arrangement (1), and devices (15a, 15b, 15c, 15d, 16, 17) for sensing the temperature, and a device for carrying out the method.

Abstract: A vehicle testing system includes a wheel plate constructed and arranged to support a vehicle wheel. A linear electromagnetic actuator has a moving magnet mechanically coupled to the wheel plate constructed and arranged to impart a controlled substantially vertical force to the wheel plate. A spring may be mechanically coupled to the wheel plate to support at least a portion of a static mass of the vehicle.