High-Resolution Data Acquisition System Enables Reliable Engine Parameter Measurements

摘要

Data acquisition plays a critical role in improving vehicle component performance and overall system reliability. Measuring engine parameters, including engine cranking speed and the mechanical condition of the engine, requires high-resolution data acquisition equipment. To record engine speed, the tachometer output signal from the ignition system typically is connected to a data logger. This output signal provides four pulses per crank revolution, which is generally enough resolution for most applications. To check the mechanical condition of the engine, however, more detailed information is required. For this application, a speed pickup sensor is connected to the flywheel. The sensor detects the passing of the teeth on the flywheel, and outputs 168 pulses per crank revolution. The sampling rate was set at 200 samples per second.