초록 ▼

The invention is directed to a method for determining a load signal of an internal combustion engine having an intake pipe with a pressure sensor, external exhaust-gas recirculation (EGR) and an EGR valve. A load signal (tl) is computed in a circuit arrangement which is proportional to the mass indu

The invention is directed to a method for determining a load signal of an internal combustion engine having an intake pipe with a pressure sensor, external exhaust-gas recirculation (EGR) and an EGR valve. A load signal (tl) is computed in a circuit arrangement which is proportional to the mass inducted per revolution of the engine. The computation is made in dependence upon measured intake-pipe pressure (ps) and the speed (n) of the engine in rpm. On the one hand, the method makes a simple adaptation possible, while, on the other hand, a correct load signal is formed also in steady-state operation and, in this way, reduced exhaust-gas emissions of the engine are made possible. The exhaust-gas mass flow flowing through the EGR valve is determined by converting the exhaust-gas mass flow into an rpm-dependent signal. The rpm-dependent signal is filtered in a filter simulating charging operations in the intake pipe. A corrective signal (scorr) proportional to the exhaust-gas mass inducted by the engine per revolution thereof is determined and this corrective signal (scorr) is subtracted from the load signal (tl) to generate and output the corrected load signal (tlcorr).

대표청구항 ▼

[ What is claimed is:] [1.] A method for determining a load signal of an internal combustion engine having an intake pipe and operating at a speed (n), an external exhaust-gas recirculation (EGR) and an EGR valve through which an exhaust gas mass flow flows from the engine, the engine inducting a ma

[ What is claimed is:] [1.] A method for determining a load signal of an internal combustion engine having an intake pipe and operating at a speed (n), an external exhaust-gas recirculation (EGR) and an EGR valve through which an exhaust gas mass flow flows from the engine, the engine inducting a mass of fresh gas and exhaust ass per revolution thereof, and said EGR valve assuming a position between fully shut and fully open, the method comprising the steps of:measuring an intake-pipe pressure (ps) in said intake pipe utilizing a pressure sensor;measuring said speed (n) of said engine in rpm;supplying said intake-pipe pressure (ps) and said speed (n) to a circuit arrangement and computing a load signal (tl) therein proportional to said mass inducted per revolution of said engine;determining said exhaust-gas mass flow flowing through said EGR valve;converting said exhaust-gas mass flow into an rpm-dependent signal;filtering said rpm-dependent signal in a filter simulating charging operations in said intake pipe;determining a corrective signal (scorr) proportional to the exhaust-gas mass inducted by said engine per revolution thereof; and,subtracting said corrective signal (scorr) from said load signal (tl) to generate and output a corrected load signal (tlcorr).