Abstract: An internal combustion engine especially for a motor vehicle is described which is provided with a combustion chamber into which fuel can be injected in at least two operating modes. A control apparatus is provided with which a switchover can be made between the operating modes in dependence upon a desired operating mode. The desired operating mode can be determined from a plurality of operating mode requests by the control apparatus.

Abstract: The invention is directed to an internal combustion engine, especially for a motor vehicle. The engine has a combustion chamber into which fuel can be injected in at least two operating modes. A control apparatus is provided with which a switchover between the operating modes can be effected. A desired value (rlmd$s) can be determined with the control apparatus for the air charge in the combustion chamber. The desired value (rlmd$s) defines a maximum value for the air charge in the combustion chamber which is not exceeded.

Abstract: The invention is directed to a method of avoiding an erroneous fault announcement when diagnosing a tank-venting system for a motor vehicle having an internal combustion engine. In the method a change in elevation is determined at which the motor vehicle is operated during the diagnosis and this change in elevation is considered in the determination of the diagnostic result.

Abstract: The invention is directed to a method for computing a fuel-metering signal for adjusting a pregiven lambda value for the composition of the air/fuel mixture of an internal combustion engine. In the method, a first signal is formed which represents the air quantity flowing into the engine and a second signal is formed on the basis of the first signal so that a first lambda desired value adjusts when using its second signal as a fuel-metering signal. Various additional second lambda desired values are formed as a function of operating parameters of the engine. A selection is made of those second lambda desired values having the highest priority and the fuel-metering signal is formed by weighting the second signal with the second lambda desired value of the highest priority.

Abstract: A device for load detection with altitude adaptation is described, wherein the load is determined based on an altitude-dependent main load signal and a collateral load signal not dependent on the altitude. In connection with defined driving conditions it is possible to detect an altitude deviation by comparison of the main load signal with the collateral load signal. The result of the comparison is integrated in an integrator with a variable time constant to form an adaptation factor, by means of which the collateral load signal is then corrected. The time constant of the integrator is changed in such a way that an altitude adaptation takes place as a function of the maximally possible altitude error.

Abstract: In a method and a system for the ventilation of a fuel tank of a motor vehicle having an internal-combustion engine which has a suction pipe with a bypass containing, in particular, an idling adjuster, the fuel tank being capable of being ventilated into the open by way of a ventilation conduit having an adsorption filter and having a first valve located between the latter and a ventilation orifice, and the adsorption filter being capable of being scavenged with scavenging air which is supplied to the suction pipe by way of a scavenging-air conduit containing a second valve, to avoid disturbances of the operating conditions of the internal-combustion engine the scavenging air for the adsorption filter is branched off from the airstream flowing by way of the bypass.

Abstract: The invention is directed to a connecting circuit for a potential-free lambda probe having a ground line and a signal line and having an offset voltage source which is connected to the ground line. This offset voltage source raises the potential of the ground line to a pregiven value relative to ground. A ground short is directly detectable in the connecting circuit of the invention in that the potential measured at the signal line drops below the offset voltage. In this way, it is no longer required as in conventional circuits to check for a ground short by enriching the mixture of an engine and to monitor the exhaust gas with the lambda probe.

Abstract: The invention is directed to a method of checking a tank-venting apparatus for a motor vehicle equipped with a fuel tank and an internal combustion engine having an intake pipe. The apparatus includes an adsorption filter having a venting end and an intake end, a supply line connecting the intake end to the tank and a connecting line interconnecting the intake pipe of the engine and the intake end of the adsorption filter. A tank-venting valve is mounted in the connecting line between the intake pipe and the intake end of the adsorption filter and a drive unit for actuating the tank-venting valve.