By Trevor Mellard
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Extra resources for Automotive Electronic Systems
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.