초록 ▼

The invention is directed to a method for checking the operability of a variable valve control in an internal combustion engine having an intake manifold and wherein the state of the variable valve control contributes to determining the combustion chamber charge. A first signal is provided and is in

The invention is directed to a method for checking the operability of a variable valve control in an internal combustion engine having an intake manifold and wherein the state of the variable valve control contributes to determining the combustion chamber charge. A first signal is provided and is indicative of the air mass actually drawn in by the engine via the intake manifold. A primary signal (HLS) for the combustion chamber charge is formed from the first signal. A second signal is formed from a desired value for the state of the variable valve control and at least one of the following: the position of a throttle flap, the pressure in the intake manifold and the rpm of the engine. An ancillary signal (NLS) for the combustion chamber charge is formed from the second signal. The primary and ancillary signals (HLS, NLS) are compared and an index is formed for the deviation of the primary and ancillary signals (HLS, NLS) from each other. A fault signal is outputted and/or stored when the index exceeds a predetermined value.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method for checking the operability of a variable valve control in an internal combustion engine having an intake manifold and wherein the state of the variable valve control contributes to determining the combustion chamber charge, the method comprising the steps of:

[ What is claimed is:] [1.]1. A method for checking the operability of a variable valve control in an internal combustion engine having an intake manifold and wherein the state of the variable valve control contributes to determining the combustion chamber charge, the method comprising the steps of:providing a first signal indicative of the air mass actually drawn in by said engine via said intake manifold;forming a primary signal (HLS) for the combustion chamber charge from said first signal;providing a second signal formed from a desired value for the state of said variable valve control and at least one of the following: the position of a throttle flap, the pressure in said intake manifold and the rpm of said engine;forming an ancillary signal (NLS) for the combustion chamber charge from said second signal;comparing said primary and ancillary signals (HLS, NLS) and forming an index for the deviation of said primary and ancillary signals (HLS, NLS) from each other; and,outputting and/or storing a fault signal when said index exceeds a predetermined value.