The solution is based on a module system called CRONOS flex by imc Berlin. The system consists of modules communicating over a bus very similar to CANbus. The system is modular. It is possible to “assemble” the instrument from individual modules for each specific measurement so that it contains all the necessary technology and at the same time it is as small as possible. The mechanical concept is illustrated by the figure. By simply snapping the modules to the base unit, a complete system is created, with the number of channels required, in the form of a single device.
On the above principle, it is possible to build a device that will contain a maximum of 128 channels. However, the customer wanted to measure part of the channels directly in the engine compartment, ie. in a corrosive environment where the CRONOS flex system does not fit. That is why part of the system is realized by separate CANSAS modules, which communicate with the control unit ising CANbus and are also powered by this bus. In the vehicle, “ordinary” fuses are replaced with a fuse with a measuring resistor. A small voltage proportional to the flowing current is sensed on the resistor. Carrying case with foam filling was delivered for storage of modules, adapted to accommodate individual modules, cabling, measuring fuses, etc.
The basic measuring module is equipped with four CANbus interfaces and its connection to the computer is via LAN cable and WiFi. The system must be connected to the notebook via GB Ethernet in order to achieve full sampling rate however. The module is equipped with 32 GB memory, sufficient for autonomous measurement, but it is possible to record to USB and external storage media, too. The total achievable sample rate is 2 MSa / s.
The HV2-4U four-channel modules are used in the system to collect high-voltage analog signals, ie. voltages up to 400V, and shunt currents on voltages up to 400V. Each module measures 4 voltage channels in the range of 2.5V to 1000V with a resolution of 24 bits. The maximum sampling frequency is 100 kHz, the bandwidth is up to 48 kHz.
Four channel HVCI8 modules are used to collect high voltage analog signals, ie. voltages up to 400V, and shunt currents on voltages up to 400V, in the engine compartment. Each module measures 4 voltage channels in the 100V to 800V range, plus 4 additional channels in the 20mV to 60V range, each with 24 bit resolution. The maximum sampling frequency is 1 kHz, the transmission bandwidth is up to 440 Hz. At low-voltage inputs it is also possible to measure currents in the range of 0-20 mA and temperature by common types of thermocouples. For use in harsh environments of the engine, these modules are in a version designed for use in the temperature range -20 to + 80 °C. These modules are controlled by the CRONOS flex control unit, which also provides data collection.
System configuration is provided by the customer. It is configured and operated via the imcStudio software package. Data evaluation is performed by Famos professional. Our company has provided detailed training in the operation of the system and in the operation of individual software packages and we also provide on-demand support.
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