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The key components of the design are: A microcontroller. One of the various AVR-based Arduino kits is typically used for this, although one of several Atmel AVR microcontrollers may be used directly in a custom OBDuino circuit. An interface to the car's management system, using the On-Board Diagnostics (OBD) connector found in most modern cars.
GM's ALDL (Assembly Line Diagnostic Link) is sometimes referred to as a predecessor to, or a manufacturer's proprietary version of, an OBD-I diagnostic starting in 1981. This interface was made in different varieties and changed with power train control modules (aka PCM, ECM, ECU). Different versions had slight differences in pin-outs and baud ...
The development of an ECU involves both hardware and software required to perform the functions expected from that particular module. Automotive ECU's are being developed following the V-model. [ 1 ] Recently the trend is to dedicate a significant amount of time and effort to develop safe modules by following standards like ISO 26262 . [ 5 ]
The first generation of engine management controller for CART racing used a modified production ECM, but performed poorly in the race car due to the harsh EMI (Electromagnetic Interference) environment. This version was never used in racing, but the experience gained enabled the engineers to design a more successful Generation 2 controller for ...
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It is generally a combined controller consisting of the engine control unit (ECU) and the transmission control unit (TCU). On some cars, such as many Chryslers, there are multiple computers: the PCM, the TCU, and the Body Control Module (BCM), for a total of three separate computers. These automotive computers are generally very reliable.
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