Given a partial knowledge acquisition dialogue (KE: Knowledge Engineer, DE: Doma

Question

Given a partial knowledge acquisition dialogue (KE: Knowledge Engineer, DE: Domain Expert):   

KE: What issues do you consider to determine if the pump needs to be replaced?

DE: If the pump’s pressure is low, or its temperature is hot, or its age is old, then I would replace it.

KE: How do you determine if the pump is bad?

DE: I first check the pump’s pressure and temperature. If the pump’s pressure is only slightly high, but its temperature is high, then it is probably bad. Also, if it’s always running hot and it’s old then it is likely bad.

KE: Can you explain why the pump’s temperature is important?

DE: I am always concerned about the temperature because if the bearings are going bad, then the temperature may rise. This is a real problem for the older pumps.

Suppose the KE is building a specific ES on the area of pump diagnostics. With this in mind list possible rules that may be incorporated into such an ES.

Explanation / Answer

DESCRIPTION:

Q1KE: What issues do you consider to determine if the pump needs to be replaced?

Answer : For Fuel Pump

A Fuel pump must be replaced if it undergoes any one of the following faults :

1.Clanking Noise : The Engine gives a Clanking Noise.

2.Engine seeming to miss at highway speeds

3.Push down on the accelerator, and the car starts to go and suddenly seems like it is going to die.

4.Your car cranks when trying to start it, but it does not start.

5.Check the temperature gauge : The temperature gauge will illuminate if the engine is running hot.

6.Check the air temperature : Not only does the coolant cool your engine, but it also plays a part in keeping your heater blowing hot.

7.Check water pump pulley: With the engine off, open your hood and locate the water pump pulley.With gloves on, grab it and wiggle it back and forth. There should be no movement, if there is, this along with the noise is a good indication you may have a water pump problem.

8.Check for leaks : It is possible to see signs of coolant leaking before you experience your vehicle’s engine overheating.

Q2.DE: If the pump’s pressure is low, or its temperature is hot, or its age is old, then I would replace it.

Answer : Yes, the pump can be replaced in that case.As mentioned in the above reasons.A pump can be replaced if it is old,or its temperature is too hot,or low pressure.

Q3 KE: How do you determine if the pump is bad?

Answer:

1. Whining noise from the fuel tank

One of the first symptoms of a problem with the fuel pump is a loud whining sound. An old or worn fuel pump may produce a noticeably loud whine or howl when it is running. Most fuel pumps will produce a quiet hum during their normal operation, however an excessively loud whine coming from the fuel tank is usually a sign that there is an issue.

2. Difficulty starting

Another symptom that is commonly associated with a problematic fuel pump is difficulty starting. Because of how they operate (constantly running whenever the ignition is turned on) over time fuel pumps can eventually wear out and weaken. A weak fuel pump may still pump fuel, however the vehicle may experience difficulty starting as a result of the lack in pressure. A weakened fuel pump can cause the vehicle to take more cranks to start than normal, and in more serious cases may even cause the vehicle to require multiple turns of the key before it will start.

3. Misfires and a decrease in power, acceleration, and fuel efficiency

Another symptom of a problem with the fuel pump is engine performance issues. As the fuel pump is what supplies the vehicle with the fuel required for combustion to occur, any issues with it can affect the engine’s fuel supply and cause issues. A faulty pump with low pressure will disturb the engine’s air-fuel ratio, which can cause all sorts of performance problems. Aside from hard starting, the vehicle may experience misfires, a loss in power and acceleration, a decrease in fuel efficiency, and even engine stalling.

4. Car is not starting

Another symptom of a problem with the fuel pump is engine performance issues. As the fuel pump is what supplies the vehicle with the fuel required for combustion to occur, any issues with it can affect the engine’s fuel supply and cause issues. A faulty pump with low pressure will disturb the engine’s air-fuel ratio, which can cause all sorts of performance problems. Aside from hard starting, the vehicle may experience misfires, a loss in power and acceleration, a decrease in fuel efficiency, and even engine stalling.

Q4 DE: I first check the pump’s pressure and temperature. If the pump’s pressure is only slightly high, but its temperature is high, then it is probably bad. Also, if it’s always running hot and it’s old then it is likely bad.

Answer:

The Domain Expert is correct as the pump is bad if it's temperature is too high.And also it is running hot and it's old.

So,it is to be replaced.

Q5. DE: I first check the pump’s pressure and temperature. If the pump’s pressure is only slightly high, but its temperature is high, then it is probably bad. Also, if it’s always running hot and it’s old then it is likely bad.

Answer:

The pump's temperature is so important because ,

The pumps accurately measure volume, no difference hot or cold - but the fuel expands as it gets warmer so a litre of cold fuel will weigh more than a litre of warm fuel and contain more energy.

As fuel tanks are underground at filling stations, the effect of climate is small but it is better to refuel in the morning, theoretically at least.

Due to friction of bad ball bearings,temperature may rise which leads to pump failure.

The thermal expansion coefficient of petroleum is about 0.001 per degree C. So the 5 degree difference would make about 0.5% difference to volume.

So, the petorl or diesel (fuel) expands on hogh temperature leading to explosion.

That's why,

The pump's temperature is important

Q6. DE: I am always concerned about the temperature because if the bearings are going bad, then the temperature may rise. This is a real problem for the older pumps.

Answer:

It is true.Since, if the bearings are going bad,then due to expansion of fuel,and due to friction, heat is generated.So, temperature may rise.

FINALLY,

The Knowledge Engineer can build a specific ES on the area of pump diagnostics with this in mind list.

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