Patent ID: 7974210

Claim:
A multi-signal analyzer for analyzing an engine, the analyzer providing data for an engine control unit to control engine performance, comprising: an AD converter for simultaneously receiving a plurality of time series signals representing physical and chemical phenomena pertaining to the engine and subjecting the signals to AD conversion; a delay time calculation unit for calculating delay time between an arbitrary two time series signals from among the plurality of time series signals input to the AD converter; a time axis adjustment unit for advancing or delaying a time axis of one signal of the arbitrary two time series signals according to the delay time calculated by the delay time calculation unit, to thereby correlate the two time series signals to the same time axis; and a data analyzer for performing analysis such as determining a mutual correlation coefficient by comparing the two time series signals made to have the same time axis, wherein the plurality of time series signals comprise signals which represent an engine fuel flow rate having a transient state, an amount of generated torque, an engine rotation speed, and an exhaust gas amount, wherein the plurality of time series signals include at least one time series signal that has at least a 10 second delay time relative to another of the plurality of time series signals, and wherein the delay time calculation unit performs one of either: finding a time point when a mutual correlation coefficient of each of the arbitrary two time series signals is maximum, wherein said time point is set as the delay time, or obtaining an impulse response output representing the correlation coefficient of the two time series signals, wherein peak impulse response output is set as the delay time.