A Wireless Microwave Telemetry Data Transfer Technique for Reciprocating and Rotating Components

Abstract

Wireless microwave telemetry addresses the difficult issue of obtaining transducer outputs from reciprocating and rotating components through the use of advanced electronic components. This eliminates the requirements of a direct link between the transducer and the acquisition system. Accuracy of the transducer signal is maintained through the use of a double frequency modulation technique which provides temperature stability and a 20 point calibration of the complete system. Multiple transmitters can be used for larger applications and multiple antennas can be used to improve the signal strength and reduce the possibility of dropouts. Examples of automotive torque converter and piston temperature measurements are provided, showing the effectiveness of the wireless measuring technique.

Influence of spray and combustion processes on piston temperatures and engine heat transfer in a high-output diesel engine

“…The piston was instrumented with 15 J-type thermocouples (TCs) with 0.4 mm diameter junctions embedded nominally 1 mm below the combustion surface, for which the temperature data was transmitted to a receiver by a wireless telemetry system. 21 The instrumentation design was very similar to the previous work using fast-response, surface-mounted TCs, 1,2 such that 13 of the 15 total subsurface TCs were aligned at the same basic locations on the piston except for the depth. The subsurface TCs had a durability advantage compared to the surface TCs, but only measured the steady-state temperature, which does not allow calculation of transient heat flux.…”

Thermal Characterization of a Gasoline Turbocharged Direct Injection (Gtdi) Engine Utilizing Lean Operation and Exhaust Gas Recirculation (Egr)

“…In the last twenty years, there have been numerous advancements in wireless telemetry techniques for internal combustion engines. Researchers have used electromagnetic induction [4,40], Bluetooth network [5], and microwave [39,41,42] wireless telemetry systems to measure piston temperatures.…”

“…Miers et al [41] documented a wireless microwave telemetry data transmission technique in 2008. The telemetry system was developed by IR Telemetrics (IRT).…”

“…The receiver also performs a frequency-to-voltage conversion and outputs an analog voltage. This conversion process also uses amplifiers and filters to reduce noise and improve signal quality [41]. The conversion process is shown in Fig.…”