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2014 Accord Sport SQ Build keep_hope_alive
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<blockquote data-quote="keep_hope_alive" data-source="post: 8309922" data-attributes="member: 576029"><p>the PCM controls the alternator behavior (voltage output and field current). when braking or slowing the PCM turns the alt on and lets it charge the battery - this means the alternator is now a heavier load on the engine and when slowing without brakes will slow the car faster. granted, this is not the same regenerative braking that a true hybrid does - where the motors become generators. but when braking the PCM turns the alt on. both situations (slowing or braking) don't hurt fuel economy - which is the entire reason for this charging scheme.</p><p></p><p>headlights are also a load so we'd rather not have them on just to maintain a higher voltage. i thought a bit about just "faking" the headlight signal or adding a toggle switch in front of the headlights - but that could be a safety issue and i haven't verified the PCM is controlling the lighting. i'm still not sure what role the ELD is playing in this scheme - maybe it's monitoring more than just ignition load and it's actually responsible for the increase in voltage when i senses the additional load from the lighting. if that is the case, my old ELD bypass would work fine. a quick test could be unplugging the lights and seeing if the lack of load prevents the voltage from increasing.</p><p></p><p>i'm personally not too concerned about it. i was happy to see voltage stability - thought i would rather the base voltage was 12.8V or 12.9V so the battery would float a bit higher and hold a charge longer.</p></blockquote><p></p>
[QUOTE="keep_hope_alive, post: 8309922, member: 576029"] the PCM controls the alternator behavior (voltage output and field current). when braking or slowing the PCM turns the alt on and lets it charge the battery - this means the alternator is now a heavier load on the engine and when slowing without brakes will slow the car faster. granted, this is not the same regenerative braking that a true hybrid does - where the motors become generators. but when braking the PCM turns the alt on. both situations (slowing or braking) don't hurt fuel economy - which is the entire reason for this charging scheme. headlights are also a load so we'd rather not have them on just to maintain a higher voltage. i thought a bit about just "faking" the headlight signal or adding a toggle switch in front of the headlights - but that could be a safety issue and i haven't verified the PCM is controlling the lighting. i'm still not sure what role the ELD is playing in this scheme - maybe it's monitoring more than just ignition load and it's actually responsible for the increase in voltage when i senses the additional load from the lighting. if that is the case, my old ELD bypass would work fine. a quick test could be unplugging the lights and seeing if the lack of load prevents the voltage from increasing. i'm personally not too concerned about it. i was happy to see voltage stability - thought i would rather the base voltage was 12.8V or 12.9V so the battery would float a bit higher and hold a charge longer. [/QUOTE]
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