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In an engine capable of continuously controlling an intake air quantity by varying an intake valve operating characteristic, an intake valve lift is sensed as well as an engine speed. Then, an intake air quantity is calculated in accordance with the engine speed and intake valve lift when an engine

In an engine capable of continuously controlling an intake air quantity by varying an intake valve operating characteristic, an intake valve lift is sensed as well as an engine speed. Then, an intake air quantity is calculated in accordance with the engine speed and intake valve lift when an engine operating point is in a very low lift state.

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In an engine capable of continuously controlling an intake air quantity by varying an intake valve operating characteristic, an intake valve lift is sensed as well as an engine speed. Then, an intake air quantity is calculated in accordance with the engine speed and intake valve lift when an engine

In an engine capable of continuously controlling an intake air quantity by varying an intake valve operating characteristic, an intake valve lift is sensed as well as an engine speed. Then, an intake air quantity is calculated in accordance with the engine speed and intake valve lift when an engine operating point is in a very low lift state. e probabilities and the states. 13. The method of state estimation according to claim 8, wherein the determined state of the system is entered into a control unit which triggers a cleaning device for the sensor. 14. The method of state estimation according to claim 13, wherein the cleaning device is at least one of a device which works with water, a mechanical cleaning device and a heater for the sensor. 15. A device for state estimation in a system for performing at least one of automatic longitudinal regulation and transverse regulation in a motor vehicle, operating according to at least one of the radar principle and the lidar principle, for the detection of at least one of soiling and blindness of a sensor, comprising: means for forming at least two indicators from at least one of signals received and transmitted by the sensor; means for weighting the at least two indicators using weighting factors; and means for performing the state estimation by taking into account the at least two indicators.