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FJR Motorcycle Forums
Technical & Mechanical Problems
New cruise control get flaky with time/miles
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<blockquote data-quote="ionbeam" data-source="post: 238027" data-attributes="member: 277"><p>The problem with the tach signal starts to show up as the frequency of the signal increases = vehicle speed is getting faster. If the AVCC does not get a stable, clean pulse train it will have problems.</p><p></p><p>When you ‘set’ the cruise control it takes a snapshot of the frequency on the tach wire then it uses the servo cable to constantly adjust the throttle so that the frequency on the tach wire always remains the same. The correct name for this is an 'error amplifier'. If the vehicle speed starts to drop, the tach signal becomes lower than the set frequency so the AVCC pulls on the throttle cable to bring it back up. If the tach signal becomes faster than the set frequency it will release the throttle cable until there is zero error. The rate that the AVCC is allowed to pull and release the cable is determined by the DIP switch settings. Light vehicle with high HP setting tells the AVCC that any changes it makes will have a rapid and powerful change in vehicle speed so it pulls and releases the throttle cable very slowly. If the DIP switches were set for a heavy vehicle with low power the AVCC can aggressively pull on the cable will little detectable results in vehicle speed.</p><p></p><p>rfulcher and I posted at nearly the same time, I'm not sure if he saw my <a href="https://www.fjrforum.com/forum//index.php?showtopic=19890&view=findpost&p=237999" target="_blank">previous post.</a></p></blockquote><p></p>
[QUOTE="ionbeam, post: 238027, member: 277"] The problem with the tach signal starts to show up as the frequency of the signal increases = vehicle speed is getting faster. If the AVCC does not get a stable, clean pulse train it will have problems. When you ‘set’ the cruise control it takes a snapshot of the frequency on the tach wire then it uses the servo cable to constantly adjust the throttle so that the frequency on the tach wire always remains the same. The correct name for this is an 'error amplifier'. If the vehicle speed starts to drop, the tach signal becomes lower than the set frequency so the AVCC pulls on the throttle cable to bring it back up. If the tach signal becomes faster than the set frequency it will release the throttle cable until there is zero error. The rate that the AVCC is allowed to pull and release the cable is determined by the DIP switch settings. Light vehicle with high HP setting tells the AVCC that any changes it makes will have a rapid and powerful change in vehicle speed so it pulls and releases the throttle cable very slowly. If the DIP switches were set for a heavy vehicle with low power the AVCC can aggressively pull on the cable will little detectable results in vehicle speed. rfulcher and I posted at nearly the same time, I'm not sure if he saw my [URL="https://www.fjrforum.com/forum//index.php?showtopic=19890&view=findpost&p=237999"]previous post.[/URL] [/QUOTE]
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FJR Motorcycle Forums
Technical & Mechanical Problems
New cruise control get flaky with time/miles
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