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Drivetrains Test > 8000 Series Tractors PST Electrical System > Flashcards

8000 Series Tractors PST Electrical System Flashcards

1
Q

What is the Chrysler Collision Detection (CCD) link?

A

The CCD link is the communication network used by the tractor controllers to ‘talk’ to each other.

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2
Q

What functions does the CCD link provide for the controllers?

A

The CCD link allows for monitoring electrical system components, controlling operations of a circuit, and displaying system information.

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3
Q

What type of wires make up the CCD line?

A

The CCD line consists of a pair of green and yellow twisted wires that connect all the control units together.

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4
Q

What components have a 120 ohm termination resistor in the CCD system?

A

The Central Control Unit (CCU) and Corner Post Display (CPD) each have a 120 ohm termination resistor connected across the pair of wires.

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5
Q

What are the PCU and CCU?

A

The PCU and CCU are considered one unit and cannot be purchased separately.

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6
Q

What is the primary purpose of the PCU?

A

The primary purpose of the PCU is to energize the solenoid shift valves to accurately control oil flow to the various clutch elements, ensuring a smooth shift.

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7
Q

How does the PCU control oil flow?

A

The PCU sends a PWM signal to the shift valve that ‘tells’ it how and when to send oil to the clutch for engagement or release the oil for disengagement.

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8
Q

What data does the PCU monitor?

A

The PCU monitors data broadcast on the CCD to adjust the shift based on conditions such as engine load, oil temperature, throttle position, PTO load, and SCV load.

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9
Q

What should be referred to when working with addresses and codes?

A

Refer to the appropriate Technical Manual when working with addresses and codes, as many of the addresses have changed slightly from version to version.

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10
Q

What is the role of system inputs to the Powershift Control Unit (PCU)?

A

System inputs to the PCU help provide safe operation and ensure consistent shifts while the PCU checks for any problems.

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11
Q

What happens when there are disagreements between inputs from various sources?

A

Disagreements between inputs will cause fault codes to be generated or may cause the transmission to default to neutral.

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12
Q

What types of inputs does the PCU receive?

A

Inputs to the PCU are both direct and indirect.

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13
Q

Where do some inputs to the PCU come from?

A

Some inputs come to the PCU directly from system components, such as switches and sensors.

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14
Q

How do other inputs reach the PCU?

A

Other inputs come via the CCD link from other controllers.

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15
Q

What does the Armrest Control Unit (ACU) contain?

A

The ACU contains two transmission related controls: the shift lever and the throttle position sensor.

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16
Q

What additional function does the ACU perform?

A

The ACU monitors the operator presence switch (seat switch).

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17
Q

Where is the ACU located?

A

The ACU is an electronic control module (circuit board) located in the armrest to the right of the operator.

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18
Q

What does the ACU sense?

A

The ACU senses signals from the throttle, shift lever, and operator presence switch.

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19
Q

How does the ACU communicate information?

A

The ACU communicates information via the CCD link for use by the PCU.

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20
Q

What is the transmission shift lever?

A

The transmission shift lever is the link between the operator and the transmission controls.

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21
Q

What is the purpose of the transmission shift lever?

A

It is used to command changes to the operating gear of the transmission.

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22
Q

What type of motion does a bump shift provide?

A

A bump shift motion provides an upshift or downshift.

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23
Q

How does the shift lever function in relation to electronic circuits?

A

The lever acts like a switch in an electronic circuit and does not use any mechanical linkages to send a message.

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24
Q

What happens when the shift lever is moved?

A

Shift lever movement activates a hall effect switch on a circuit board above the shift lever pivot point.

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25
Q

How are the outputs from the hall effect switch processed?

A

The switch outputs are sensed by the ACU and are sent to the PCU via the CCD link.

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26
Q

What is the throttle command?

A

The throttle command signal is a combined signal from the hand throttle, foot throttle (if equipped), and field cruise.

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27
Q

How does the ACU, ICU, and CCU/PCU interact with the throttle command?

A

The ACU senses the hand throttle command signal, the ICU senses the field cruise command signal, and the CCU/PCU senses the foot throttle command signal.

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28
Q

What does the PCU do with the throttle command signal?

A

The PCU uses the throttle command signal to make engine speed changes during shifting and to change engine speed for selected reverse gears.

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29
Q

What information does the PCU use to determine the throttle command signal?

A

The PCU determines the throttle command signal by knowing the engine speed, ground speed, current gear position, and requested gear position.

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30
Q

How does the PCU adjust the throttle command signal?

A

The PCU uses the information to adjust the throttle command signal to modify engine speed during shifts and may increase or decrease engine speed for some forward and reverse gears.

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31
Q

What is the operator presence switch?

A

The operator presence switch is a deflection sensing switch in the seat that sends a signal to the ACU, similar to switches used in lawnmower seats.

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32
Q

What does the ACU do with the information from the operator presence switch?

A

The ACU broadcasts the information onto the CCD for use by the PCU / CCU in determining whether or not a shift can be made.

33
Q

What is the state of the seat switch when the seat is unoccupied?

A

The seat switch should be open when the seat is unoccupied.

34
Q

What is the state of the seat switch when the seat is occupied?

A

The seat switch should be closed when the seat is occupied.

35
Q

What is the minimum weight required to close the operator presence switch?

A

A minimum weight of 80 lb (36 kg) in the middle of the seat is needed to close the operator presence switch.

36
Q

What is the Dtac solution regarding shifting gears?

A

The tractor will not shift to gear after returning to the seat if the shifter was not placed in Park prior to leaving the seat.

37
Q

What does the PCU monitor as an input for gear shifting decisions?

A

The PCU monitors engine speed.

38
Q

Where is the engine speed sensor located?

A

The engine speed sensor is located on the timing gear cover on the front of the engine.

39
Q

What does the engine speed sensor read?

A

The engine speed sensor reads the teeth on the camshaft drive gear.

40
Q

What does the engine speed sensor send a signal to?

A

The engine speed sensor sends a signal directly to the Engine Control Unit (ECU).

41
Q

How is the signal from the engine speed sensor transmitted?

A

It moves on to the CCU / PCU as a 0.0-5.0 volt signal across the CAN network.

42
Q

What provides the calibration for measuring engine speed?

A

The number of engine pulses per revolution provides the calibration for measuring engine speed.

43
Q

At which CCU address can calibration for engine speed be made?

A

Calibration for engine speed can be made at CCU address 20.

44
Q

What is the only acceptable value for the calibration at CCU address 20?

A

‘027’ is the only acceptable value for this calibration.

45
Q

What is the purpose of the wheel speed sensor in the PCU?

A

The wheel speed sensor is used to adjust commands to the solenoid valves during a shift, to improve shift quality.

46
Q

Where is the wheel speed sensor located on wheel tractors?

A

On wheel tractors, the wheel speed sensor is located behind the Hitch SCV valve stack on the rear differential case.

47
Q

Where is the wheel speed sensor located on track tractors?

A

On track tractors, it is located on the front of the pump drive housing.

48
Q

What type of sensor is the wheel speed sensor?

A

It is a hall effect sensor that sends a voltage pulse every time a tooth on the differential ring gear passes by.

49
Q

How many pulses represent one revolution of the axle?

A

The CCU knows that 372.9 pulses represent one revolution of the axle (if correct value is entered).

50
Q

How does the CCU/PCU calculate wheel speed?

A

The CCU/PCU measures the time between voltage pulses and calculates wheel speed.

51
Q

Where can wheel speed as the number of pulses per revolution be entered?

A

Wheel speed can be entered at CCU address 58 & 59.

52
Q

What is the relationship between the strength of an electromagnet and the number of turns and current?

A

The strength of an electromagnet is directly proportional to the number of turns and the amount of current flowing through it.

53
Q

Is the resistance of all solenoids the same?

A

No.

54
Q

Will system voltage always be the same?

A

No.

55
Q

Does resistance change with temperature?

A

Yes.

56
Q

What is Pulse Width Modulation (PWM)?

A

PWM is a type of signal that provides accurate control of the electrohydraulic shift valves.

57
Q

How is the electronic pulse sent in PWM?

A

An electronic pulse is sent from the PCU to the E/H valve at a predetermined frequency, which depends on the style of valve used.

58
Q

What does the pulse width regulate in PWM?

A

The pulse width regulates the effective, or average rate of current to the shift valve.

59
Q

What happens to power within each cycle of PWM?

A

The power is turned on and off within each cycle.

60
Q

How is oil flow controlled in PWM?

A

The percent of ON time is varied to control the oil flow through the valve.

61
Q

What is the duty cycle command in PWM?

A

The ratio of ON time to cycle time is called the duty cycle command.

62
Q

What does the diagram in PWM illustrate?

A

The diagram shows how the pulse width is used to accurately control the valve movement and therefore, oil flow to the various elements.

63
Q

How many outputs does the Powershift Control Unit (PCU) have?

A

The PCU has only 2 outputs.

64
Q

What is the first output of the PCU?

A

The first output is the CCD network, where information on shifting and gear selection is sent to the rest of the tractor.

Diagnostic information is also sent across the CCD link for recalling codes and performing calibration.

65
Q

What is the primary purpose of the second output of the PCU?

A

The primary purpose of the second output is to provide shift commands for the solenoid shift valves.

66
Q

How does the PCU determine the movement of the solenoid shift valves?

A

The PCU decides the best way to move the solenoid shift valves based on all the input information to obtain the smoothest shift possible under a variety of operating conditions.

67
Q

What is Automatic Power Shift (APS)?

A

Automatic Power Shift (APS) shifts the transmission to maintain engine speed up to a maximum gear selected by the operator.

68
Q

When was APS first introduced?

A

APS was first introduced with the 8010 series.

69
Q

What switches are inputs to the PCU for APS operation?

A

The APS Set Switch and the APS Resume Switch are inputs to the PCU for APS operation.

70
Q

What is the function of the APS Set Switch?

A

The APS Set Switch commands the transmission to shift gears to maintain engine speed and allows the operator to choose a maximum gear.

71
Q

What is the function of the APS Resume Switch?

A

The APS Resume Switch is a two-position rocker switch that is momentarily in the RESUME position.

72
Q

How can APS be cancelled?

A

APS can be cancelled by manually shifting the transmission into another gear, neutral, or reverse.

73
Q

What is the function of the rack position sensor?

A

The rack position sensor provides feedback information to the ECU about the actual position of the rack.

74
Q

Where is the rack position sensor located?

A

The rack position sensor is located inside the injection pump.

75
Q

What components make up the rack position sensor?

A

It consists of two inductive coils: the rack position coil and the rack reference coil.

76
Q

What does each coil in the rack position sensor provide?

A

Each coil provides a voltage input to the ECU.

77
Q

What does the ECU calculate using the rack position sensor data?

A

The ECU calculates the fuel flow and sends a percent fuel delivery signal to the CCU / PCU via the CAN bus.

78
Q

How does the CCU / PCU utilize the information from the ECU?

A

The CCU / PCU uses this information to determine if a modified shift pattern should be used, based on engine load.

79
Q

What do newer tractors measure in relation to the rack position sensor?

A

Newer tractors measure rail pressure.

Drivetrains Test (4 decks)

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