I.c. engine in-cylinder ionization detection system with ionization detection circuit and ignition coil driver circuit integrated into a single package

摘要

This invention is related to the field of automobile ignition control and diagnosis systems. More particularly, it is related to the field of integrating multiple electronic devices into a single package, electronics package or Application Specific Integrated Circuit (ASIC), to reduce part count and package size. The present invention comprises two embodiments of an integrated ionization detection circuit 80 and ignition on coil driver 75 according to the present invention, an ASIC (fig 52) and a single package (fig 53). The apparatuses reduce the cost and complexity of an in-cylinder ionization detection system by combining like functionality into one ASIC or electronic module easing packaging constraints. In both embodiments, a current sink 94 is used. The current sink 94 removes noise in the form of voltage spikes. The voltage spikes are high voltage, but of short duration. The current sink prevents these spikes from turning on the IGBT 22. However, the current sink 94 allows the IGBT command signal to pass. This feature of the present invention also comprises a switch whereby ionization current and coil primary current are multiplexed.