New Holland 667TA/EBF, Руководство по ремонту

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2-39
87519804 NA Issued 11-06 Bur
CHAPTER 2 - 667TA ENGINE OVERHAUL
ENGINE REPAIR MANUAL
RECOVER STRATEGIES
•
Control of fuel leaks.
In the case of fuel supply problems, the system
controls the engine with suitable constant power
values obtained with a low number of rev and high
torque values in order to inject the maximum quantity
of fuel.
•
Control of pressure in the rail.
When the pressure in the rail exceeds safety values,
the engine reduces power.
•
Synchronism problems
In the case of synchronism problems, faulty rev
s e n s o r s , t h e s y s t e m c o n t r o l s t h e e n g i n e by
increasing the number of revs in order to improve
interpretation of the signals.
•
Power restrictions as operating temperature
increases.
When the temperature of the supercharging air rises
above 88° C (190° F), power reduction is started,
when a temperature of 120° C (248° F) is reached,
performance is further reduced and is comparable to
that of the same engine if it were aspirated.
•
Reduction of power as reference temperature
varies
In normal operating conditions, the system knows the
supercharging air, oil and water temperatures.
If th e te mpe ratu re of th e engine water is no t
available, the system takes the temperature of the oil
as reference and when this reaches the threshold of
103° C (217° F), it star ts to reduce the power
available. On reaching 113° C (235° F), power is
reduced to 50%.