Cruise Safety Circuit
Is it possible to have the killer switch sync with the brake pedal and lever...just like our cars, when we depress the brake pedal cruise control get disengage..
The purple wire will disengage the Cruise Control instantly if it looses it's connection to ground. Back in the old days (before LED brake lights) this ground was provided by (thru) the filament of the brake lamp bulb (one side of the bulb was connected to ground, the purple wire was connected to the other (ungrounded) side of the of the filament. The instant the brake was applied 12 volts would be applied to the bulb and the ground would be lost at the purple wire causing the cruise to disengage. Now we have a LED as a brake lamp bulb and the ground signal will not work on the purple wire. We therefore have to use a relay to interrupt the ground on the purple wire. The way it works is the normally closed contacts of the relay provide a ground to the purple wire. As soon as the brake is applied (either hand or foot lever) the 12 volts going to the LED is used to also energize the coil of the brake relay, causing the contacts of the brake relay to open. This causes the purple wire to lose its ground. In my circuit design there is also another set of relay contacts in series with the purple wire provided by the CLUTCH relay. This relay is energized the instant the clutch lever begins to move. If the cruise should malfunction you can also turn it off with the power switch for the cruise.
The next level of safety would be the engine KILL switch. In the (UNLIKELY) event of cruise control runaway you could stop the engine with the kill switch. I think most riders would have pulled in the clutch lever so you aren't going to be accelerating anyway. With the clutch in and the engine howling at WOT the computer electronics would protect the engine from catastrophic damage while you figured out what to do next
You can also (possibly) overpower the cruise by twisting the throttle HARD in the "slow down" direction. I "think" the beaded chain would break if you did this (I haven't tried it and don't intend to
2015 V1K Orange
Givi Crash Bars
LED amber fog/driving lights
Panel mounted digital voltmeter
Garmin 2610 GPS (ancient like me)
Audiovox CCS-100 Cruise Control
Last edited by AuroraTom; 01-02-2019 at 09:44 AM.