{TAIL ~ A device} 2, wherein {HEAD ~ the reference value} becomes smaller when the engine speed is increased and the ignition timing is advanced 
{ TAIL ~ A device } 2 , wherein { HEAD ~ the reference value } becomes smaller when the engine speed is increased and the ignition timing is advanced
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH