Functional Scope Of Engine, PSM, Function - GF54.21-D-3007HA

MODEL 906 with CODE (ED5) Parameterizable special module (PSM) working speed control

MODEL 906 with CODE (ED8) Preinstallation for parameterizable special module (PSM) working speed control Engine functions

The PSM control unit provides the possibility of influencing functions in the engine control unit.

For this the parameterizable function module working speed control has been implemented which ensures the correct operation of the engine control unit.

Function "Working speed control"

The actual speed of the engine can be regulated via the working speed control function.

On the one hand several fixed rpm can be specified, on the other hand the rpm can also be freely adjusted via buttons.

For safety reasons, the working speed control function can only be used on a stationary vehicle with the hand brake applied.

Working speed control (including fixed speed and hand throttle actuator)

Courtesy of MERCEDES-BENZ USA

The PSM control unit can activate the output of rpm limits, torque limits and speed limits (GB) via discrete inputs or body manufacturer CAN signals.

The following conditions must be fulfilled for this function:

Function module "Limits" active (parameter)
Circuit 15 ON
Working speed control not active

Once these conditions are met, then the output of limits can be activated with the discrete or body manufacturer CAN outputs. Working speed control enables the body manufacturer (ABH) to adjust the motor speed.

Adjustment can be performed in the following ways:

Selection of a fixed speed
Analog specification of the motor speed via a hand throttle actuator
Connection of a 2-stage switch (ADR button) to increase or reduce rpm
Use of a cruise control switch to increase, reduce or resume rpm
Use of body manufacturer CAN for direct specification of rpm
Use of body manufacturer CAN to increase, reduce or resume rpm

The working speed controls ensure that sudden changes in rpm or exceeding the parameterized minimum and maximum rpm are not possible. In the event of a fault, the system attempts to set the lowest possible motor speed (idle speed) or to completely deactivate working speed control.

With working speed control, the following input conditions can be parameterized for internal function enable:

Signal settings
- "Tml. 15 ON" and normal voltage (fixed)
- Transmission in neutral
- Engine at idle speed
- Hand brake applied (querying of this condition cannot be deactivated)
- Brake operated
- Clutch depressed or fully depressed
- Freely parameterizable Controller Area Network (data bus/CAN bus) (CAN) signal is valid
Properties to be parameterized
- Function module "Working speed control" activated
- Vehicle speed = 0 km/h (querying of this condition cannot be deactivated)
- Waiting time after "Clutch depressed" expired
- Waiting time for function enable expired

Once these conditions are met, the internal function enable can be activated discretely with the outputs of the working speed control request or via the body manufacturer CAN.

If the internal function enable has been activated, the motor speed specification in the PSM control unit can be output and changed. The possibilities for changing the motor speed are listed below in the order corresponding to their priority (fixed speed, hand throttle actuator, increase, reduction or resumption).

Fixed speed specification

3 different fixed speeds can be output by means of outputs (discretely or via body manufacturer CAN). Each fixed speed can be assigned a run-on time of up to 25.5 s. If a fixed speed is selected, it is approached using a ramp. If no fixed speed is selected then the lower rpm limit of the working speed control is approached with a ramp when none of the other rpm changes is active.

Hand throttle actuator

The hand throttle actuator can either be operated via an analog input (input 07 or 08) of the PSM control unit or via the body manufacturer CAN (output "Hand throttle actuator value from the body CAN bus"). In both cases, the motor speed is bounded by the parameterized limits (minimum and maximum) of the hand throttle actuator.

To activate the hand throttle actuator the accelerator pedal module must be in a rest position and the motor speed must be in a stable condition.

If an analog input is used, it is possible to activate and deactivate the hand throttle actuator via the signal setting "Input signal for activation of hand throttle actuator".

When the hand throttle actuator is activated, a ramp is initially used to approach the set motor speed. When this motor speed has been reached, the changes made at the hand throttle actuator are forwarded directly.

Use commercially available hand throttle actuators, like those used for Mercedes-Benz trucks. Use a high-side output of the PSM control unit as a power supply for this hand throttle actuator. Failure to do so may result in severe fluctuations in motor speed.

SOR

This operating mode has the lowest priority and can therefore only be used when neither the fixed speed nor the hand throttle actuator are active.

The input sources are either the cruise control switch, discrete inputs at the PSM control unit or signals from the body manufacturer CAN. The functions are "Increase motor speed", "Reduce motor speed" and "Resume motor speed".

The rpm changes know 2 operating modes, the step mode and the ramp mode.

In the stage mode, the motor speed is reduced or increased by the parameterized stage height each time an input is actuated. If the input remains actuated, the system changes to ramp mode. A ramp with the parameterized ramp slope is then output. This ramp stops either when a motor speed limit is reached or when actuation of the input is canceled.

Pulse-mode and ramp-mode resumption

The rpm resume functions similar to a cruise control. If this input is actuated, a previously stored motor speed is approached again.

This is done using a ramp.

The motor speed is stored each time an input used for increasing or reducing the motor speed (in stage or ramp mode) is actuated. If working speed control is deactivated and reactivated, the current motor speed is adopted as the new start value. Actuating the resumption function sets the original motor speed again.

The value for resume is only stored until the PSM control unit changes to rest mode (e.g. if the vehicle is parked for a longer period). The value is stored for as long as the state "Tml. 15 ON" exists.

Parameters for "Working speed control" function

Working speed control request from discrete input

Discrete request for activation of the working speed control enable. If an unfulfilled condition for activation of working speed control is detected when this input is actuated, an event entry is made (950D).

The freeze frame data for the event contains the information indicating which conditions are not yet fulfilled.

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Working speed control request from body manufacturer CAN

Request for activation of the working speed control enable via the body manufacturer CAN. The setting of the event "950D" with its freeze frame data takes place as in the case of the discrete request.

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Working speed control request from power take-off (PRO)

Request from PTO for activation of the working speed control enable.

Parameterization possibilities:

Request for working speed control

Function module "PTO" (signal ID 10ED)

For activation of working speed control, the request from the "Power take-off" function is taken into consideration.

Inquiry deactivated (signal ID 300B)

Querying of this condition is deactivated

Brake

Activation input (bit signal) as condition for working speed control enable.

Parameterization possibilities:

Brake lights actuated (signal ID 107F)

Querying of the brake for activation of working speed control

Permanent LOW (signal ID 1000)

Querying of this condition is deactivated

Hand brake

Querying of this condition cannot be deactivated.

Activation input (bit signal) as condition for working speed control enable.

Parameterization possibilities:

Hand brake applied (signal ID 1055)

Querying of the hand brake for activation of working speed control

Selector lever in position "N", with transmission 722.6

The availability of the signal depends on the vehicle equipment.

Activation input (bit signal) as condition for working speed control enable.

Parameterization possibilities:

Selector lever in position "N" (signal ID 10F2)

Querying of the neutral position for activation of working speed control

Inquiry deactivated (signal ID 300B)

Querying of this condition is deactivated

Engine at idle

Activation input (bit signal) as condition for working speed control enable.

Parameterization possibilities:

Engine at idle (signal ID 113D)

Querying of the engine idle for activation of working speed control

Inquiry deactivated (signal ID 300B)

Querying of this condition is deactivated

Clutch pedal depressed or fully depressed

The availability of the signal "Clutch pedal fully depressed" depends on the vehicle equipment.

Activation input (bit signal) as condition for working speed control enable.

Parameterization possibilities:

Clutch pedal depressed (signal ID 11C4)

Query whether the clutch pedal is depressed for activation of the working speed control

Clutch pedal fully depressed for (signal ID 10F1)

Query whether the clutch pedal is fully depressed for activation of working speed control

Inquiry deactivated (signal ID 300B)

Querying of this condition is deactivated

The transmission neutral position switch is fitted on vehicles with the following equipment:

with code (MJ6) Engine start/stop system
With code (E07) Starting-off aid
with code (ZG1) Engageable all-wheel drive, with code (ZG2) Permanent all-wheel drive, with code (ZG3) Gear reduction for all-wheel drive or with code (ZG4) Permanent all-wheel drive with gear reduction

The clutch pedal switch for the inquiry "Clutch pedal fully depressed" is fitted on vehicles with code (MJ6) Engine start and stop system.

Freely parameterizable CAN signal

Activation input as condition for working speed control enable.

The procedure is as follows:

Signal = Any signal
Type of signal = Bit or other signal
Type of evaluation
- With bit signal = Signal inverted or non-inverted
- With other signals = Threshold and whether signal must be above or below threshold

Parameterization possibilities:

Any signal

Any signal can be used here.

Inquiry deactivated (signal ID 300B)

Querying of this condition is deactivated.

Further parameters for freely parameterizable CAN signal "working speed control"

These must be parameterized in the working speed control properties:

Threshold (value range = 0 to 65 535)
Threshold evaluation, selection = Value must be higher or lower than threshold
Invert (with bit signals only), selection = Yes or no

Waiting time after "Clutch depressed"

For the time which is stored in the parameter working speed control clutch waiting time, the clutch status must be "clutch pedal depressed/fully depressed" (depending on the parameterization), in order to consider this condition as met in the function module working speed control.

If the parameter "Waiting time after "Clutch depressed"" is set to 0, checking of the clutch status is deactivated in the function module "Working speed control".

Waiting time for function enable

After all other input conditions have been fulfilled, the time which is stored in the parameter "ADR function enable waiting time" must expire in order for this condition to be regarded as fulfilled in the function module "Working speed control".

If the parameter "ADR function enable waiting time" is set to 0, checking of this waiting time is deactivated in the function module "Working speed control".

Further parameters for working speed control:

Maximum motor speed
Maximum torque
Maximum speed

Parameters for "Change of motor speed" function

Request "Rpm increase" from discrete input, activation input (bit signal) for rpm increase in function module "Change of motor speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request for rpm increase from body manufacturer CAN

Activation input (bit signal) for rpm increase in function module "Change of motor speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Rpm reduction" from discrete input

Activation input (bit signal) for rpm reduction in function module "Change of motor speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request for rpm reduction from body manufacturer CAN

Activation input (bit signal) for rpm reduction in function module "Change of motor speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Rpm resumption" from discrete input

Activation input (bit signal) for rpm resumption in function module "Change of motor speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request for rpm resume from body manufacturer CAN

Activation input (bit signal) for rpm resumption in function module "Change of motor speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Further parameters for changing motor speed

The following parameters are available for changing motor speed:

Ramp slope (in ramp mode)
- Value range = 0 up to 255 rpm per second
Jump height (in stage mode)
- Value range = 0 to 255 rpm
Switchover time from stage to ramp mode
- Value range = 0 to 25.5 s, in 100 ms steps

Parameters for "Rpm limitation" function

Request "Maximum rpm 1" from discrete input

Activation input (bit signal) for selection of maximum rpm limit 1. Triggers output of the parameter "Maximum rpm 1" or output of limit set 1 (in the case of parameterization of the function "Output of limits without working speed control") at the output of the function module "Rpm limitation".

Limit set 1 consists of the following parameters:

Maximum rpm 1 (rpm limitation without working speed control)
Maximum vehicle speed 1 (rpm limitation without working speed control)
Maximum torque 1 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Maximum rpm 2" from discrete input

Activation input (bit signal) for selection of maximum rpm limit 2.

Triggers output of the parameter "Maximum rpm 2" or output of limit set 2 (in the case of parameterization of the function "Output of limits without working speed control") at the output of the function module "Rpm limitation". Limit set 2 consists of the following parameters:

Maximum rpm 2 (rpm limitation without working speed control)
Maximum vehicle speed 2 (rpm limitation without working speed control)
Maximum torque 2 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Maximum rpm 3" from discrete input

Activation input (bit signal) for selection of maximum rpm limit 3.

Triggers output of the parameter "Maximum rpm 3" or output of limit set 3 (in the case of parameterization of the function "Output of limits without working speed control") at the output of the function module "Rpm limitation". Limit set 3 consists of the following parameters:

Maximum rpm 3 (rpm limitation without working speed control)
Maximum vehicle speed 3 (rpm limitation without working speed control)
Maximum torque 3 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request for maximum rpm 1 from body manufacturer CAN

Activation input (bit signal) for selection of maximum rpm limit 1.

Triggers output of the parameter "Maximum rpm 1" or output of limit set 1 (in the case of parameterization of the function "Output of limits without working speed control") at the output of the function module "Rpm limitation". Limit set 1 consists of the following parameters:

Maximum rpm 1 (rpm limitation without working speed control)
Maximum vehicle speed 1 (rpm limitation without working speed control)
Maximum torque 1 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request for maximum rpm 2 from body manufacturer CAN

Activation input (bit signal) for selection of maximum rpm limit 2.

Limit set 2 consists of the following parameters:

Maximum rpm 2 (rpm limitation without working speed control)
Maximum vehicle speed 2 (rpm limitation without working speed control)
Maximum torque 2 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request for maximum rpm 3 from body manufacturer CAN

Activation input (bit signal) for selection of maximum rpm limit 3.

Maximum rpm 3 (rpm limitation without working speed control)
Maximum vehicle speed 3 (rpm limitation without working speed control)
Maximum torque 3 (rpm limitation without working speed control)

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Enabling of function "Fixed speed" and "Rpm limitation" by discrete input

Activation input (bit signal) for motor speed enable in function module "Fixed speed" and "Rpm limitation".

"Enabling of function "Fixed speed" and "Rpm limitation" by discrete input" or "Enabling of function "Fixed speed" and "Rpm limitation" by body manufacturer CAN" must be set so that activation of a fixed speed or rpm limit (i.e. activation of a limit set) is possible. At one of these inputs it must be possible to apply a logical 1, either by means of bit information in the signal pool or by means of parameterization to "Permanent HIGH" (signal ID 1001).

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Enable function fixed speed and rpm from the body manufacturer CAN

Activation input (bit signal) for motor speed enable in "Fixed speed" and "Rpm limitation".

"Enabling of function "Fixed speed" and "Rpm limitation" by body manufacturer CAN" or "Enabling of function "Fixed speed" and "Rpm limitation" by discrete input" must be set so that activation of a fixed speed or rpm limit (i.e. activation of a limit set) is possible. At one of these inputs it must be possible to apply a logical 1, either by means of bit information in the signal pool or by means of parameterization to "Permanent HIGH" (signal ID 1001).

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Further parameters for rpm limitation

The following additional parameters are also available for rpm limitation:

Minimum and maximum rpm 1 to 3 (rpm limitation with working speed control)
Maximum torque 1 to 3 (rpm limitation without working speed control)
Maximum vehicle speed 1 to 3 (rpm limitation without working speed control)

Parameters for "Fixed speed" function

Request "Fixed speed specification 1" from discrete input

Activation input (bit signal) for selection of fixed speed 1. Triggers output of the parameter "Fixed speed specification 1" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Fixed speed specification 2" from discrete input

Activation input (bit signal) for selection of fixed speed 2. Triggers output of the parameter "Fixed speed specification 2" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request "Fixed speed specification 3" from discrete input

Activation input (bit signal) for selection of fixed speed 3. Triggers output of the parameter "Fixed speed specification 3" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Request of fixed speed requirement 1 from CAN-ABH

Activation input (bit signal) for selection of fixed speed 1. Triggers output of the parameter "Fixed speed specification 1" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request of fixed speed requirement 2 from body manufacturer CAN

Activation input (bit signal) for selection of fixed speed 2. Triggers output of the parameter "Fixed speed specification 2" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Request of fixed speed requirement 3 from body manufacturer CAN

Activation input (bit signal) for selection of fixed speed 3. Triggers output of the parameter "Fixed speed specification 2" at the output of the function module "Fixed speed".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Enabling of function "Fixed speed" and "Rpm limitation" by discrete input

Activation input (bit signal) for motor speed enable in function module "Fixed speed" and "Rpm limitation".

"Enabling of function "Fixed speed" and "Rpm limitation" by discrete input" or "Enabling of function "Fixed speed" and "Rpm limitation" by body manufacturer (ABH) CAN" must be set so that activation of a fixed speed or rpm limit (i.e. activation of a limit set) is possible. At one of these inputs it must be possible to apply a logical 1, either by means of bit information in the signal pool or by means of parameterization to "Permanent HIGH" (signal ID 1001).

Parameterization possibilities:

Any signal

Any signal can be used here.

Permanent LOW (signal ID 1000)

Function deactivated

Enable function fixed speed and rpm from the body manufacturer CAN

Activation input (bit signal) for motor speed enable in function module "Fixed speed" and "Rpm limitation".

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Permanent LOW (signal ID 1000)

Function deactivated

Waiting time after "Clutch depressed"

Depending on the parameterization the clutch status must be "clutch depressed" or "clutch fully depressed" and for the time which is stored in the parameter "clutch waiting time". This condition is thus fulfilled in the function module "Fixed speed" and "Rpm limitation". If the clutch waiting time is set to 0, checking of the clutch status is deactivated in the function module "Fixed speed" and "Rpm limitation".

Waiting time for function enable

After all other input conditions have been fulfilled, the time which is stored in the parameter "Function enable waiting time" must expire in order for this condition to be regarded as fulfilled in the function module "Fixed speed" and "Rpm limitation".

If the function enable waiting time is set to 0, checking of this waiting time is deactivated in the function module "Fixed speed" and "Rpm limitation".

Further parameters for "Fixed speed" function

The following additional parameters are also available for fixed speed:

Fixed speed specification 1 to 3
Cutout delay 1 to 3

Parameters for "Hand throttle actuator" function

Activation of hand throttle actuator

Depending on the parameterization of this output the function module hand throttle actuator uses the results of the input 07 or 08 to calculate the hand throttle actuator rpm (active) or not (inactive).

It is also possible for you to use an arbitrary signal for the activation. For example, you could use a discrete input so that it would then be possible to deactivate the hand throttle actuator.

Parameterization possibilities:

Permanent HIGH (signal ID 1001)

Hand throttle actuator activated

Permanent LOW (signal ID 1000)

Hand throttle actuator deactivated

Any signal

Any signal can be used here.

Hand throttle actuator value from body manufacturer CAN

16-bit value from body manufacturer CAN. The function module hand throttle actuator thus calculates the requirement of the hand throttle actuator rpm.

The value is interpreted as the desired motor speed.

Valid range = 0 to 65 535, resolution 1 rpm.

Parameterization possibilities:

Any signal from body manufacturer CAN

Any signal from Use signal from the body manufacturer CAN.

Inquiry deactivated (signal ID 300B)

Function deactivated

Further parameters for "Hand throttle actuator" function

The following additional parameters are also available for the hand throttle actuator:

Minimum and maximum hand throttle actuator speed
Selection of analog input for hand throttle actuator, selection option = Input 07 or 08

Signals of function working speed control which are stored in the signal pool

Enabling of working speed control

This bit signal is used as an enable signal for further "working speed control" function modules. It is set by the function module "Working speed control".

This signal is set when the inputs of the function module working speed control are valid, the times for the function enable and the clutch waiting time have elapsed and one of the working speed control requests (discrete, body manufacturer CAN, power take-off) is active.

Specified value of rpm (Function module speed change)

This 16-bit value is calculated by the function module rpm change and is the rpm requirement which is passed on to the Controller Area Network bus Class B (interior) (CAN B). This motor speed is bounded by the current rpm limits and is calculated using the inputs at the function module "Change of motor speed".

This value is valid, when the inputs of the function module rpm change and the signal "Enabling of working speed control" is active.

Current maximum rpm limit (function module "Rpm limitation")

This 16-bit value is selected by the function module rpm limitation based on the parameterization for the maximum rpm from the inputs. If more than one input is active at the same time, the lowest maximum motor speed is selected in each case.

Depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control (module "Power take-off")", further bounds are defined, this time on the basis of the parameters "Maximum rpm limit of working speed control" and "Maximum rpm limit of power take-off".

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Current minimum rpm limit (function module "Rpm limitation")

This 16-bit value is selected by the function module rpm limitation based on the parameterization for the minimum rpm. If more than one input is active at the same time, the highest minimum motor speed is selected in each case.

This value is determined depending on the status of the bit signals "Enabling of working speed control" and "Request for working speed control ("Power take-off" module)" based on the following parameters:

Maximum rpm limit of working speed control
Maximum rpm limit from PTO

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Current maximum torque (function module "Rpm limitation")

This 16-bit value is selected by the function module rpm limitation based on the parameterization for the maximum torques. If more than one input is active at the same time, the lowest torque is selected in each case.

Maximum torque of working speed control
Maximum torque from PTO

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Current maximum vehicle speed (function module "Rpm limitation")

This 8-bit value is selected from the function module rpm limitation based on the parameterization for the maximal vehicle speeds. If more than one input is active at the same time, the lowest maximum vehicle speed is selected in each case.

Maximum vehicle speed of working speed control
Maximum vehicle speed from PTO

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Rpm specified value (function module "Fixed speed")

This 16-bit value is selected by the function module fixed speed based on the parameterization for the fixed speed from the inputs.

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Enabling of fixed speed

This bit signal is used as an enable signal for further "working speed control" function modules. It is set by the function module "Fixed speed" and "Rpm limitation".

This signal is set if the inputs of the function module "Fixed speed" are valid, the times for the function enable and the clutch waiting time have expired and either the "Enabling of working speed control" signal or the "Request for working speed control (module "Power take-off")" signal is active.

Rpm specified value (function module "Hand throttle actuator")

This 16-bit value is calculated by the function module hand throttle actuator from the inputs. Here the motor speed is converted linearly between the parameterizable limits "Minimum hand throttle actuator speed" and "Maximum hand throttle actuator speed".

This value is valid if the inputs of the function module "Hand throttle actuator" are valid and the signal "Enabling of working speed control" is active.

Stage and ramp mode

This bit signal is used by the function module "Change of motor speed" in order to switch from stage mode to ramp mode. For this purpose, the function module "Pulse and ramp mode" evaluates the actuation duration of the inputs for change of motor speed and sets this signal as soon as the actuation duration exceeds the time stored in the parameter "Ramp switchover time (stage or ramp mode)".

This value is valid if the inputs of the function module "Rpm limitation" are valid and the signal "Enabling of fixed speed" is active.

Description of associated function modules

Function module "Working speed control"

Working speed control enable and accelerator pedal lock