_____
 |__  /
   / / 
  / /_ 
 /____|
       

______ 
| ___ \
| |_/ /
|    / 
| |\ \ 
\_| \_|
       
       

     _    
    / \   
   / _ \  
  / ___ \ 
 /_/   \_\
          

         
         
 #####   
 ##  ##  
 ##  ##  
 ##  ##  
 ##  ##  
         

  ____  
 |  _ \ 
 | | | |
 | |_| |
 |____/ 
        

IMPORTANT: enter the case-INsensitive alphabetic (no numbers) code AND WRITE SOME SHORT summary of changes (below) if you are saving changes. (not required for previewing changes). Wiki-spamming is not tolerated, will be removed, so it does NOT even show up in history. Spammers go away now.


Visit Preferences to set your user name
Summary of change:
'''Injector measurement''' I was interested in injector opening/closing time regarding to flyback setups. All of the below measurements made on a 12 Ohm Hi-Z injector dry -without fuel pressure-, and PowerFlyback installed inside the ECU. No PWM-ing was enabled, pulse width is ~14ms. Voltage was 12.1-12.2V, voltage/current measurements were made after a 0.3Ohms resistance, so test setup is like: +12.2V____[0.3Ohms]____*Measurement*____[injector]____INJ-OUT The results: http://quasar.dynaweb.hu/~lezsi/vems/3flyback.gif Red channel means measurement voltage (or current). Blue channel means mechanical movement/noise. *1. graph is one open-hold-close pulse with '''no external flyback'''. Closing time is '''1.7ms''' *2. graph is similar open-hold-close pulse with '''18V Zener flyback'''. Closing time is '''~0.95ms''' *3. graph is similar open-hold-close pulse with '''30V transient diode flyback'''. Closing time is '''0.9ms''' -all of them includes internal PowerFlyback- It's visible on the red channel that after opening (about 1ms later) current has a pulsation which shows the movement of injector iron core. At the same time mechanical noise started (blue channel). At closing phase there's not visible current-pulse in red channel but a spike goes well over starting (+12V) voltage which is the inductive "kick-back" or flyback current. Blue channel's mechanical noise shows here the exact position of mechanical injector closing. As my movement/noise detection (knock sensor) was nearly installed on the injector it's coil slightly picked up injector current, so on the blue channel it's also visible when injector current switched on/off (a single spike before noise). http://quasar.dynaweb.hu/~lezsi/vems/inj_knock3.jpg
Optional: Add document to category:
Wiki formatting: * is Bullet list ** Bullet list subentry ... '''Bold''', ---- is horizontal ruler, <code> preformatted text... </code> See wiki editing HELP for tables and other formatting tips and tricks.