DETONATION SENSOR
A) The knock sensor detects potentially harmful detonation and
sends this information electrically to the ECU. B) The vibration
caused by detonation compresses the crystal inside the knock sensor,
resulting in a momentary voltage. In Motronic, the ECU uses this
signal to retard the timing as necessary. AKA) Detonation Sensor
DIRT
BIKE
Motorcycles that are designed to be ridden on rough
terrain. They are known as Dirt Bikes or trail bikes. Dirt bikes
will typically have suspension with more travel than a street
bike, higher ground clearance, and a small (less than 500cc)
engine.
Related to dirt bikes are dual-sport bikes which are street-legal
versions of dirt bikes with more suspension travel than a standard
bike but having all the other equipment usually found on street
bikes.
DOHC
Dual Over Head Cams. Two camshafts found in the head or top of
the engine that open and close the valves. Two cams allow
more precise control than one.
DRIVING CYCLES
To ensure that test remain mutually comparable , the speeds used
on the dynamometer must accurately reflect actual highway operation
. Testing is based on a standardized driving cycle in which shift
points, breaking manoeuuvres, idling and atationary phases have
all been selected to reflect the traffic conditions typically encountered
in large urban areas.Seven different test cycles are in use at
the international level.
DUAL-SENSOR LAMBDA CLOSED-LOOP CONTROL
Installing the Lambda oxygen sensor downstream of the catalytic
converter provides better protection agaisnt contamination from
the exhaust gas.This type of backup sensor can provide a second
control signal to augment the one from the main sensor upstream
of hte converter.
The second signal is super-imposed on the first to provide stable
mixture composition over an extended period.
DUCATI
A brand of motorcycle produced in Italy.
DWELL-ANGLE CLOSED-LOOP CONTROL
High-perdormance ignition systems operate with ignition coils which
charge very rapidly. For this purpose, the ohmic resistance of
the primary winding is reduced to less than 1(omega). The information
content of the signal of a hall vane switch in the ignition disbtributor
corresponds to the signal of an ignition contact breaker. In one
case, the swell angle is determined by the distributor cam and,
in the other, the pulse duty factor is determined by the rotor
vane. A rapidly chargeable ignition coil cannot operate with a
fixed dwell angle. This is why two measures must be taken to protect
the ignition coil: a primary-current regulation system and a dwell-angle
closed-loop control system.
DYNAMOMETER
An instrument for measuring force or power; especially, the power
developed by a motor.
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