FIELD: engines and pumps.
SUBSTANCE: invention relates to internal combustion engines, in particular to controlling the fuel injection volume according to the intake air volume. Disclosed is heat-ray-type airflow meter (14), comprising: signal processor (14a) for converting a detected air quantity to a frequency signal, engine controller (10) has conversion table (10a) for converting the frequency signal to an air quantity. Signal processor (14a) and conversion table (10a) have features such that the frequency increases in correspondence with increases in the magnitude of a positive air quantity and the frequency decreases in correspondence with increases in the absolute value of a negative air quantity. In conversion table (10a), prescribed positive air quantity value (Qa1) is assigned as a dummy output for frequencies lower than prescribed threshold value (Frsh). Under normal circumstances, frequencies lower than minimum value (Frmin) are not used. Frequency decreases to near 0 Hz when there is a disconnection or a short circuit, dummy output (Qa1) is therefore output, and an injection quantity equal to or greater than a misfire limit is ensured.
EFFECT: technical result consists in reducing ignition misfire before switching to fail-safe mode.
8 cl, 4 dwg
