OT2106A Electronic Engine Governor Speed Controller
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figure 5-1 Speed control system structure
The controller includes speed signal processing circuit, the reference setting circuit, PID error processing
circuit, the correction amplifier circuit, signal loss protection and output protection circuit. Its principle of
work is that: first it receives speed signal from magneto electric sensor. After processing and transform, it
compares with reference signal and then generate error signal. After PID operation on this error signal,
regulation voltage is formed. After being amplified, this regulation voltage is used to drive actuator for
achieving control.
Besides, inside the controller there is speed signal loss protection circuitry to monitor the speed signal
input. Once the signal is not detected, the controller immediately reduce outputs control signal to the minimum
fuel supply amount, then the actuator response the signal and turn the fuel supply flow rate to minimum
position, forcing the engine to stop.
To protect the controller from being shorted or overloaded, a automatic circuit breaker is set in the output
circuit. After the short circuit or overload is repaired, circuit breaker automatically recover. During the open
circuit protection, the overheating circuit will be cooled so that the output position signal is 0, forcing the
engine to stop.
六、
Common malfunction and troubleshooting
6.1 Common malfunction
Improper operation is usually the main reason of various engine malfunction. When a malfunction occurs,
you should first check whether the engine itself is in a good state. Therefore, you should first separate control
system from the engine, and then determine the real cause of the malfunction.
Based on the using time, the cause of the controller malfunction can be divided into following two
situations:
1, use for the first time, following reasons are tipical:
(1) Power supply: The system is not receiving power or reverse polarity or the power does not meet the
requirements;
(2) Installation and connection: improper mechanical installation or incorrect electrical connections; bad
