Hunter MAVERICK MV500, Owner'S Manual

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The engine EFI system controls and adjusts various control objects according to engine operating conditions. Such as: fuel
quantity, ignition timing, excessive working condition compensation, idle speed and so on.Engine operating conditions are
generally divided into: starting conditions, idle conditions, stable operating conditions, excessive operating conditions and
heavy load conditions.
When the engine is in the starting condition, the basic fuel injection amount required by the engine is calculated by
sampling the engine block temperature, the intake air temperature and the pressure, etc., and the driving circuit drives the
injector and the idle speed control valve to operate, and according to the battery Signals such as voltage, atmospheric
pressure, and start-up duration are constantly being corrected.
When the engine is in idling condition, according to the engine temperature, different idle target speeds are set, and the
intake air amount is controlled and adjusted by the idle speed control valve, and then the current speed is corrected by
controlling the ignition advance angle and the idle speed control valve. Target speed deviation.
When the engine is in stable condition (ie, normal working condition), the current engine speed and current load are
calculated by sampling the crank position sensor and the intake pressure sensor, and the basic fuel injection amount and
basic are obtained according to the speed and load information. Ignition advance angle, and then by sampling each sensor
signal and obtaining information such as oxygen sensor voltage, cylinder temperature, intake air temperature, battery
voltage, etc., to correct the basic fuel injection amount and ignition advance angle to obtain the final fuel injection amount
and ignition. The advance angle data is then used to command the drive circuit to drive the injector and the ignition coil to
control the operation of the engine. When the engine is in excessive working condition, the current working condition
information, such as sudden acceleration, sudden deceleration, slow acceleration, etc., is calculated by sampling the
engine load and the throttle position, and the basic quantity and correction calculated in the steady state condition are
determined. Increase the excessive working condition compensation after the quantity.
When the engine is under heavy load conditions, the current speed, load, throttle position, catalyst temperature, etc. are
sampled, and the mixture is enriched according to the calculation to meet the performance requirements and the three-
way catalytic converter protection.
19
EFI Principles