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Study on measurement technology of microengines

This paper describes the recent progresses of the measurement technology on micro thermal engines with displacement less than 1 cc. An integrative platform characterizing micro engines in terms of their torque, speed, power, temperature field and other properties has been developed and versatile tasks can be accomplishd with satisfactory precision. Applying a DC motor as dynamometers, the power of micro engines can be tested. The temperature field of cylinder wall is measured in this test platform using the IR thermography techniques. Transitional data produced by an incremental coder are captured as function of time by a fast reacting computer and software system. With frequency analysis and digital filter, the dynamic information of micro engines is calculated. Experiments demonstrate that both the temperature and thermal efficiency of micro engines are low as the result of small size. The torque of micro engines changes slightly with the speed at normal operation scope. The transient speed can be used to calculate the gas pressure inside the cylinder and other parameters. Experimental study testified these non-contact methods.