Patent ID: 7987041
Filing Date: 2011-07-26
Classification: F02D,Y02T

Abstract:
1. A monitoring system for an internal combustion engine including a fuel injection control means for outputting a fuel injection signal to an injector based on a target fuel injection quantity and a target fuel injection timing according to a driving condition of the engine, the monitoring system comprising: a computation means for computing an actual fuel injection quantity and an actual fuel injection start timing based on the fuel injection signal; and a determination means for determining whether a fuel injection malfunction exists by comparing the actual fuel injection quantity and the target fuel injection quantity and comparing the actual fuel injection start timing and the target fuel injection timing; wherein the determination means determines that the fuel injection malfunction exists when a difference between the actual fuel injection quantity and the target fuel injection quantity is larger than a first specified value and when a difference between the actual fuel injection start timing and the target fuel injection timing is larger than a second specified value, and the determination means determines that no fuel injection malfunction exists when at least one of (i) the difference between the actual fuel injection quantity and the target fuel injection quantity is less than or equal to the first specified value, and (ii) the difference between the actual fuel injection start timing and the target fuel injection timing is less than or equal to the second specified value.