Exam 10: Governors and Electronic Control Systems

Technician A says that a diesel engine needs a governor to prevent a commercial vehicle from wasting fuel. Technician B says that a diesel engine needs a governor to regulate fuel delivery because diesels are very sensitive to slight changes in the amount of fuel injected and can overspeed. Who is correct?

Two technicians are describing a low power concern on a mechanical fuel injection pump. Technician A says that you should check the linkage with the accelerator pedal pressed to the floor to see if it reaches full throttle. Technician B says that weak governor spring can cause this concern. Who is right?

While discussing possible causes of a low-power problem in an engine that uses a mechanical governor, Technician A says that weak governor springs can cause the problem. Technician B says that a leaking tube connecting the intake manifold and air-fuel ratio control device can cause the problem. Who is correct?

Technician A says that the units on a scanner for a fuel pressure regulator energized by a PWM signal will be reported in volts and amps of electrical current. Technician B says that the units for a PWM signal may be reported as a percentage or in milliseconds Who is correct?

What is more commonly referred to as electronic engine management in a diesel engine?

On mechanical governors with centrifugal flyweights, what can become weak because of age and heat and fatigue from constant compression and release cycling?

Technician A says that horsepower (kilowatts), maximum torque output, and torque rise are adjustable without factory authorization. Technician B says that chassis manufacturer-specific parameters include calibrations for the tachometer and integration of chassis controllers to the onboard vehicle networks. Who is right?

Which of the following is a temporary storage place for information that needs to be quickly accessed?

Which of the following torque rise and transmission configurations is best used in an automobile?

Controlling an output device by using feedback from a single sensor is referred to as _________.

The model predictive engine control (MPC) calibration strategy makes a decision about a particular future control step or sequence based on:

During which one of the following conditions will the tension of the starting spring or governor spring of a mechanical governor usually be greater than flyweight force?

Technician A says that any type of governor will work well when pulling heavy loads in off-road conditions without surging and causing driveline damage. Technician B says that an automotive governor is best suited to those operating conditions. Who is correct?

Technician A says that smoke, low power, hunting, engine stalling, poor acceleration, and excessive engine speed are some of the problems that indicate a governor may require evaluation. Technician B says that wire ties sealed with lead tags cover critical governor adjustments to prevent tampering, and imprint on the lead seal identifies the manufacturer or repair shop. Who is right?

Air-fuel ratio devices have two adjustments, one adjustment is for controlling the initial starting point where:

Two technicians are describing mechanical governor service. Technician A says that governor mechanisms are designed for wear and deterioration to increase engine speed and torque, not decrease it. Technician B says that air-fuel ratio devices are pressure tested to check for diaphragm leaks. Who is right?

Limiting maximum engine speed and acceleration rate is also critical to:

What is the most commonly used engine calibration and control strategy used by today's ECMs?

Technician A says that PID control involves using control loops that use fixed lookup tables to continually adjust engine actuator output. Technician B says that when the lookup table is uploaded to an ECM, it is used to help solve mathematical problems such as how much fuel the ECM commands for injection. Who is right?

What is the most commonly used engine calibration and control strategy in today's ECMs?