Automotive Electronic Systems by Trevor Mellard

By Trevor Mellard

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Extra resources for Automotive Electronic Systems

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When the fluid is below this level, the capacitance element will be partially or totally uncovered and surrounded in part or total by air, so producing a change in capacitance. 26 shows the construction of such a sensor. 24 shows the principle and typical construction of a resistive sensor for measuring the linear deflection of a vehicle, which may be used as input data for a headlamp levelling system useful if the vehicle is loaded. 25 shows the principle and construction of a resistive sensor designed to measure angular position.

The electronic regulator is usually small enough to be alternator-mounted: Bodymounted regulators are now only used with alter­ nators having high excitation currents or where special requirements are demanded. The most important electronic components in the regulator are transistors and a Zener diode. The transistor has the function of switching the A B power switching control (B+ve) Condition at speed n, | Condition at speed Regulator ifflffl lllliniillll Off ! IIIMIII Off win ilidll ifcliP I max lm,^ / / / sü / -~"-—''\ | h Off on Off on Imax ΤθΠ2 ♦J o f f l* τ\γ Toff, | Ton, (from auxiliary * **«»..

The auxiliary field exciter diodes carry a relatively small current hence the exciter diodes are smaller and need dissipate only about 1W. Filtering The output waveform of the three-phase full wave rectifier is fairly smooth in appearance and the average DC value closely approaches the optimum. Further smoothing can be effected by filtering, and capacitive and/or inductive circuits may be used for this purpose. In automotive sys­ tems the battery creates an inherent smoothing effect; as current is supplied from the battery into the system during times when the rectifier output would otherwise be below the battery voltage.

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