P10221: Baja 1 (Baja Driveline Test Development)

Future Recommendations

To Purchase:

The current one in use is borrowed from John Wellin of ME Department. Purchasing a new one is highly recommended. A F333 or F900 series from Degree C Inc. cost about $310 (has high lead time).

This is recommended to run the TFX analysis software for pressure measurements. The current PC in the dyne cell has NI DAQ driver conflict issues which prevents the TFX analysis software from running correctly. More importantly, the new PC must meet display resolution requirements of 1028x768 for TFX analysis software to display properly. An external monitor is also recommended. In addition, installation of a copy of NI LabVIEW and MATLAB software is adviced but not required.

To Replace:

These SCXI-1001 chassis has intermittent configuration issues and may not acquire correct data sometimes. See Troubleshooting on how-to resolve this issue. The module also has a high warm-up time of about 20 minutes which could increase setup time as this is a shared resource. In addition, the BNC/TC-2095 rack connected to the SCXI-1102 module has 2 Hz bandwidth filters on each input. This is fine for temperature measurement since thermocouples typically have slow response rate. However, this is undesirable for analog measurements. Furthermore, the SCXI-1102 module is operated in multiplexed mode which means that all input channels of the SCXI module are multiplexed into a single analog input channel i.e. for each 32 channels on each rack. Multiplexed mode scanning acquisition rates have limitations that are determined based on the hardware in the system, and the mode of operation. The maximum multiplexing rate of SCXI is 333 kHz.

Due to the scale of the engine (9-10 hp) compared to the DC motor (120 hp), precise control is mandatory to avoid "chugging". While the dyno-loc IV could be be easily configured for different linear-acceleration (LAC) rates - with minimum of 40 RPM per step; the feedback rate (i.e. the rate at which the system acquires torque/RPM data needed for closed-loop control) is hard to configure. The feedback rate increases control precision and smoothens out "chugging". Easy reconfiguration of the feedback rate is featured in newer dyno controllers. The dyno controller should be replaced. To minimize effects on acquired value, software-solution to "chugging" is discussed in Sensor Integration

The current arrangement of all electronic devices and wirings increases electrical noise. For instance, thermocouple wires carry signals in mV range and run parallel with other signals with higher voltage range. This increase noise susceptibility in acquired signals. This arrangement should be changed!

This is mainly an issue for RIT Facilities but should be addressed as soon as possible.

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