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The fuel heating system has completed a decade of operation in flex fuel vehicles to enable engine start in cold start conditions. Besides its proven-in-use benefits to reliable engine start, some recent studies have shown advantages of heating fuel also with respect to emission reduction, drivability enhancement and fuel economy. These benefits make this system a potential candidate to meet the increasingly demanding requirements of the new Brazilian emission legislation PROCONVE L7/L8. To allow system operation, not only to cold starts but whenever required, it is necessary to evaluate the system behavior under different use cases to determine the new system’s mission profile. Therefore, a multitude of tests is required to collect this data for analysis. However, performing such tests with the actual system can be very costly and time-consuming, due to the high variance of test parameters, such as engine sizes, fuel blends, emission driving cycles, ambient temperature, etc.

In some engine measuring systems, the signal acquisition is synchronized with crank angle, rather than time. This technique is particularly beneficial when dealing with parameters such as incylinder pressure and other combustion analysis data that are closely linked to the engine working cycle. In such system, the crankshaft’s top dead center triggers the start of an acquisition with periods of varying time duration, which depends on engine speed [1]. However, there are scenarios where these very signals must be analyzed along with signals acquired with time synchronization. This is the case, for example, of engine knocking calibration, in which combustion data should be linked with injection, ignition, and other engine parameters, which are time-based. Moreover, most used signal processing algorithms are conceived for uniform sampling.