Wednesday April 11th, 2018

Question 1

Managing air-fuel ratio controls

Answer 1

Minimizes the production of PM emissions or black smoke during acceleration.

Question 2

What is “Droop” ?

Answer 2

The change or difference in engine speed caused by a change in load.

Question 3

Definition of “Hunting” ?

Answer 3

A rhythmic change in engine rpm at idle speed caused by uneven feeling of cylinders.

Question 4

What are Mechanical Governors ?

Answer 4

Regulates the quantity of fuel I injected by the high pressure injection pump using fly weights and spring

Question 5

Governor Spring Force

Answer 5

A throttle lever connected to the governor adds or removes tension.

Question 6

What is “Torque Control” ?

Answer 6

Regulation fuel that enters the cylinders to produce an appropriate amount of torque for engine speed.

Question 7

What is “Effective Stroke” ?

Answer 7

The distance the plunger moves between port opening and port closure.

Question 8

What are “Timing Pins” ?

Answer 8

Locks injection pump or engine in position to obtain correct pump to engine timing.

Question 9

What is “Sleeve Metering” ?

Answer 9

Sliding control sleeve.

Sleeve position determines when injection period ends by spilling fuel from the plunger.

Question 10

Reference Voltage (Vref)

Answer 10

Precise voltage supplied to ECM sensors.

Typically 5 volts.

Question 11

Piezoresistive Sensors

Answer 11

Measures vibration and dynamic or continuous pressure changes.

Question 12

Variable Reluctance Sensors

Answer 12

Measures rotational speed; wheels, Vehicle speed, engine speed, camshaft and crankshaft speed.

Question 13

Hall Effect Sensors

Answer 13

Measures the rotational speed of a shaft.
Produces digital signal square waveform.
strong signal at low shaft rotational speed.

Question 14

Control Sleeve Position Sensor

Answer 14

Sensor used in electronic governors.

Provides close loop feedback about control sleeve position.