Patent ID: 8631785

Claim:
A method for detecting injection quantity deviations in injectors, comprising: monitoring a series of injections performed by a particular injector, each injection in the series of injections having a corresponding cycle time; measuring a first value of a variable associated with an actuator of the injector at a particular point in time during the cycle time of a first injection of the series of injections, wherein the variable controls the actuator or indicates a state of the actuator; measuring a second value of the variable at a point in time during the cycle time of a second injection of the series of injections, wherein the point in time is equivalent to the particular point in time during the cycle time of the first injection; comparing the first value with the second value to determine a deviation of the second value from the first value, and calculating a deviation of an injection quantity between the first injection and the second injection based at least in part on the determined deviation of the second value from the first value.