A=D converter for monitored parameters in IC engine control system - has different groups of registers corresponding to different switching factors selected via control circuit depending on entered switching factor

摘要

The A/D converter has a channel selector for selecting one of several analogue signal input channels, the voltage of the analogue input signal compared with successive reference voltages. Different registers hold the results of these comparisons, the channel selection information and operating mode information (1A,1B; 2A,2B; 3A,3B), arranged in groups corresponding to the different switching factors, selected via a control circuit (51). An interrupt request signal generator contains logic circuits providing interrupt request signals dependent on the comparison results. ADVANTAGE - Improved real-time processing rate for analogue/digital conversion of monitored parameter signals, without central processing unit.