Virtual Instruments are new instrument type that combining hardware and software together. A virtual instrument system includes instrument hardware, concerned software and a computer. It can control a machine and get the operating parameter of a machine. An engine test bench was developed with VC++ basing on Virtual Instruments technology. The system can control an engine and a chassis dynamometer. It can get the signal of engine torque, the speed of the engine and the position of the gas pedal. And a signal generator was developed to produce signal to debug the system as a virtual source of signal. It can work properly after we have an experiment in our lab.
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