| Tester for Engine Control Unit |
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This system was designed to test engine control units for a major automotive component supplier. The picture shows the engine control unit with a set of electronic injector solenoids acting as loads on top, the interface unit simulating the input transducers, output loads and indicators and the cabling, with current transducers, connecting the two. The interface connects to analogue and digital control boards in an industrial computer. A test program, written in C++ under Windows®, controls the unit functionality. The program uses counter timers and dedicated hardware to simulate engine and wheel speed sensor outputs, digital outputs to simulate switches and digital to analogue converters to simulate linear transducers such as the throttle pedal, air pressure and temperature transducers. Front panel lamps give immediate visual indication of output states and BNC connectors are provided to allow various waveforms to be seen on an oscilloscope.
This screen capture shows the initial control and indication functions for basic manual testing. The interface unit and the industrial computer are designed for full automatic testing of the engine controller. In addition, a CAN controller card in the computer allows access to all test and diagnostic functions within the engine control unit.
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