Auto Electronics Projects. An Introduction to Your Car by Maplin (Auth.)

By Maplin (Auth.)

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T h e snag is t h a t a s m a l l e r r e p r e s e n t a t i o n of this a c t i v i t y a l s o a p p e a r s a c r o s s t h e primary, L I . T h e effect is an initial pulse of up t o s e v e r a l h u n d r e d v o l t s . At t h e point of breaking t h e c i r c u i t , t h e m e c h a n i c a l switch S I h a s a v e r y n a r r o w gap b e t w e e n its c o n t a c t s which might b e m e a s u r e d in m i c r o n s . S u c h a gap is e a s y for a c o u p l e of h u n d r e d v o l t s t o bridge; t h e coil e x p e n d s all its e n e r g y in producing an a r c b e t w e e n t h e s w i t c h c o n t a c t s , and t h e r e is n o n e left for t h e plug.

T h e c o n t a c t s u r f a c e s b e c o m e damaged, developing a h o l e or pit in t h e p o s i t i v e side and a r a i s e d pip on t h e n e g a t i v e surface, as t h e inevitable arcing c a u s e s metal t o migrate from o n e s u r f a c e to t h e o t h e r . T h e lumpy r e s u l t c a u s e s irregular timing and bad s e p a r a t i o n , but it may b e p o s s i b l e to rescue them with t h e skilful a p p l i c a t i o n of a fine s t o n e . T h e n t h e r e is t h e ( s o m e t i m e s b e t t e r than dreadful) mec h a n i c a l a u t o - a d v a n c e m e c h a n i s m , with its centrifugal b o b w e i g h t s , s p r i n g s , c a m c o n t o u r s and v a c u u m a s s i s t d e v i c e .

5 s h o w s how, from different output levels as p r o d u c e d by c o r r e s p o n d i n g r o t o r s p e e d s , t h e t r i g g e r level is n e a r t h e peak of t h e s l o p e if t h e output is low, and n e a r t h e beginning if it is high. At a s t r o k e , what we have h e r e is, by way of an added b o n u s , an a u t o m a t i c ignition a d v a n c e m e c h a n i s m , and this with j u s t o n e moving part — t h e rotor! 4 . coil Pickup (^) in // U \ J magnetic for Rotary ferromagnetic element Magnetic timing sensor il j / / / Narrow Gap Maximum narrow gap voltage ^ / Maximum wide gap voltage P e r m t t a n e n m Electronic ignition Wide air gap offers high reluctance and results in weak magnetic field for coil (b) ^^^S I + I/ **^e§> Π Η^-Ν « II / / —7/ II // Wide G a p I Rotor a r m key /^^^^^^^^^^^^^^^^^^^^^^^^^^\^^\ ' Re UCt0r a n t I /oV^^^T-| (ts.

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