Multi-channel digital oscilloscope and logical analyzer for the multi-event injection analysis of diesel engines

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The advanced common-rail diesel engines are capable of multi-event fuel injection with dynamic injection pressure control. The in-cylinder premixed burning can be effectively enhanced through the digital combustion control strategies on early pilot injection, injection rate moderating, and multi-shot scheduling. An embedded controller equipped with a field programmable gate array (FPGA) device has been programmed to produce up to 10 fuel injection events per cycle with crank-angle-resolve injection timing and time-resolved injection duration control. The control decisions need to be made deterministically and be executed through the FPGA card (40MHz) via the embedded real-time controller (2.4GHz). However, in addition to the physical thread speed of the FPGA card, the communication between the FPGA and RT hardware impose limitations on the speed of the control loop. It is critical to simultaneously measure the individual digital action of each section of the hardware and the software control algorithms. One device that can handle the complex interactions between these signals is a high speed digital oscilloscope with analog and logic input channels (also known as a mixed signal oscilloscope or MSO). The MSO also allows high speed timing resolution, fast state acquisition, and sophisticated triggering/monitoring to identify faults, find digital logic errors, and setup/hold variations. The proposed equipment will fundamentally help to improve the architecture of the current control code developed at the laboratory, which will help to significantly improve the combustion processes of the next generation clean diesel engines.