By Joerg Schaeuffele, Thomas Zurawka

Because the early seventies, the improvement of the car has been characterised via a gradual bring up within the deployment of onboard digital structures and software program. This pattern keeps unabated and is pushed via emerging end-user calls for and more and more stringent environmental standards. this day, virtually each functionality onboard the trendy automobile is electronically managed or monitored. The software-based implementation of auto capabilities presents for unheard of freedoms of suggestion and layout. besides the fact that, vehicle improvement demands the lodging of contrasting necessities reminiscent of larger calls for on safeguard and reliability as opposed to cheaper price ceilings, longer product existence cycles as opposed to shorter improvement occasions in addition to a starting to be proliferation of version editions. targeted emphasis is given to the digital structures in powertrain, chassis, and physique. The contents of the driver-vehicle-environment process crucial process fundamentals improvement approaches for digital platforms and software program tools and instruments utilized in the improvement, manufacture, and repair of digital platforms, should be priceless to somebody operating with automobile digital structures and/or software program within the car production and provide undefined.

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Any variables being processed as input variables for a program being executed on the microcontroller of an ECU represent time- and value-discrete signals. The microprocessor may be drawn as a block in the closed control loop or open control loop, as shown in Fig. 2-7. Here, the normally time- and value-continuous input signals W and R are mapped onto the time- and value-discrete signals Wk and Rk. From these, a program calculates the time- and value-discrete output signals Uk which, in turn, are mapped onto the time- and value-continuous signals U.

However, the attendant rise in cost, as well as limitations to installation space in smaller vehicles, will require a reduction in the number of ECUs. For this reason, the number of ECUs may be expected to drop, or at least there will be no further increase in that number. For example, a variety of software functions currently implemented in separate ECUs may be implemented in the future in a single ECU, if available installation space is limited. This is another reason for the continuing increase in the number of software functions per ECU.

Therefore, to simplify the discussion that follows, the text will no longer differentiate between internal and external signals. Unless explicitly stated otherwise, the internal signals discussed in the following text will be termed W, R, and U. 1 Time-Discrete Systems and Signals In analog systems, all occurring signals comprise continuous functions of time. Therefore, when observing signal X for the duration of interval (time) t, the unambiguous state X(t) may be assigned to the signal (Fig. 2-6(a) ).

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