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Home >> Mercedes Benz Truck >> 2011 >> Sprinter 3500 Cab (906.155) V6-3.0L DSL Turbo (642.898) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Relays and Modules - Computers and Control Systems >> Body Control Module >> Description and Operation >> GF54.21-D-3010H Functional Scope of PWM Functions, PSM, Function

GF54.21-D-3010H Functional Scope of PWM Functions, PSM, Function




GF54.21-D-3010H Functional Scope Of PWM Functions, PSM, Function

- with CODE (ED5) Parameterizable special module (PSM)


- with CODE (ED8) Preinstallation for parameterizable special module (PSM)

Pulse width modulation (PWM) functions (PWM output)

Signal "Tml. 58d (PWM)"
The signal "circuit 58d (PWM)" from the instrument cluster can be output as a PWM signal on the PWM-capable output 09 or output 10.
If no signal is received, 0 % is output.

Signal ID 3006
Value range 0 to 100 %
Output frequency 500 Hz

Signal "Display dimming (PWM)"
The "Display dimming (PWM)" signal from the instrument cluster can be output as a PWM signal at the PWM-capable output 09 or output 10.
If the "Display dimming (PWM)" signal from the instrument cluster is invalid, 70 % is output.
If the "Display dimming (PWM)" signal changes, the new percentage is set using a ramp in order to prevent a sudden change in the display dimming. The parameters of the ramp are set in the parameter set "Discrete outputs - Default PWM signals - Property parameterization".
There are 2 parameters:
- Ramp time:
- Time in 10-ms-steps which determines the duration of the ramp.

- Ramp amplitude:
- Change in percent per ramp step

Output of the signal depends on the status of tml. 15R.
With "Tml. 15R ON", the output value is determined by the status of the standing lights. If the standing lights are ON, the previously set value is retained. If the standing lights are OFF, 70 % is set.

Signal ID 301A
Value range 0 to 100 %
Output frequency 500 Hz

Signal "Vehicle speed (PWM)"
The "Vehicle speed (PWM)" signal from the instrument cluster can be output as a PWM signal at the PWM-capable output 09 or output 10.
If no signal is received, no pulses are output.
Output of the signal depends on the state of tml. 15.
With "Tml. 15 OFF", no pulses are output.
The following formula applies for converting the vehicle speed into pulses:
- Pulses (1/s) = [Speed (km/h) x 4 (pulses/m)] ÷3.6

The following settings apply:

Signal ID 3007
Value range (speed) 4 to 254 km/h
Value range (PWM signal) 4.4 to 282.22 pulses/s
Pulse cycles 4 ms up to 112.5 km/h, then reduced to 1.77 ms

Signal "motor speed (PWM)"
The signal "motor speed (PWM)" from the EZS control unit can be output as a PWM [pulse width modulation] signal on the PWM-capable output 09 or output 10.
If no signal is received, no pulses are output.
Output of the pulses can be adjusted using the "K-factor" in the parameter set "Discrete outputs - PWM - Settings for default PWM signals". This parameter determines how many pulses are output per revolution. The default value is one pulse per revolution.
The following formula applies for converting the motor speed into pulses:
- Pulses (1/s) = K-Faktor x motor speed (rpm) ÷60

The following settings apply:

Signal ID 3002
Value range (K-factor) 1 to 10
Value range (motor speed) 400 to 12.000 1 rpm
Value range (PWM signal) 6.7 to 2000 pulses/s
Pulse cycles Fixed at 400 micro s

Signal "Inside temperature (PWM)"
The "Inside temperature (PWM)" signal from the air conditioning system can be output as a PWM signal at the PWM-capable output 09 or output 10.
If no signal is received, 0 % is output.
Output of the signal depends on whether the air conditioning system is installed. If no air conditioning system is installed, 100 % is output. The following formula applies for converting the inside temperature into the percentage (duty cycle) for PWM output:
- Duty cycle = [Inside temperature (°C) x 4] ÷232 (°C)

The following settings apply:

Signal ID 300A
Value range 0 to 58 °C
Value range (PWM signal) 0 to 100 %
Pulse cycles 200 Hz

Signal "Outside temperature (PWM)"
The "Outside temperature (PWM)" signal from the instrument cluster can be output as a PWM signal at the PWM-capable output 09 or output 10.
If no signal is received, 0 % is output.
The signal output depends on the installation of the outside air temperature sensor. If the temperature sensor is not installed, 0 % is output.
The following formula applies for converting the outside temperature into the percentage (duty cycle) for PWM output:
- Duty cycle = [Outside temperature (°C) + 40 (°C)] ÷125 (°C)

The following settings apply:

Signal ID 3009
Value range (outside temperature) -40 to 85 °C
Value range (PWM signal) 0 to 100 %
Pulse cycles 200 Hz

Signal "Wheel speed (PWM)"
The wheel pulse counter can be output as a PWM signal at the PWM-capable output 09 or output 10.
The pulses to be output are calculated every 100 ms. The pulses already output and the current wheel speed are included in the calculation. Including the wheel speed results in more constant output of the pulses when the vehicle is being driven at a constant speed.
Via the backward counting implemented in the hardware of the output pulses it is ensured that no deviation of the output pulses from the specified value occurs. The deviation is limited to a maximum of one pulse per operating cycle.
The following formula applies for converting the current wheel speed into pulses:
- Pulse (1/s) = [wheel speed (rpm) x 48 (pulse/wheel revolution)] ÷60

The specified value calculated in this way is then compared with the actual number of pulses so far output and, if necessary, corrected slightly.

The following settings apply:

Signal ID 3000
Value range (Wheel Speed) 0 to 21171 rpm
Value range (PWM signal) 0 to 1694 pulses/s
Pulse cycles Fixed at 50 % duty cycle

Signal "PWM function test"
The PWM function test allows a PWM signal to be output at the PWM-capable output 09 or 10 for testing purposes. This enables the connected system to be tested.
The function is available in the Diagnosis Assistance System (DAS) menu "Actuations".

Freely parameterizable PWM signal for the discrete outputs 09 and 10
This function module is used to output a freely parameterizable PWM signal at the discrete output 09 or 10.
The freely configurable PWM signal 1 must be applied at output 9 and the freely configurable PWM signal 2 must be applied at output 10.
The function can be activated and the signal assigned via the parameters "activation" and "signal".
The parameter "Frequency" is used to set the output frequency of the PWM signal.
The value range is 40.0 to 2000.0 Hz in 0.1 Hz steps.
Via the parameter "100-% value" it is possible to determine the value of the PWM signal which corresponds to 100 % PWM [pulse width modulation]. If this value is exceeded by PWM signal 1, the PWM output stops at 100 %.
For all values which are below or equal to the 100-%-value, the duty-cycle the PWM-output is calculated as per the following formula:
- Duty-Cycle (%) = ["signal" x 100 %] ÷"100-%-value"

The output signal of the signal generator "Freely parameterizable PWM signal for output 09" (signal ID 3037) and "Freely parameterizable PWM signal for output 10" (signal ID 3038) must be parameterized for output at the PWM-capable discrete output 09 and 10.

The following settings apply:

Signal ID PWM signal 1, 3037
PWM signal 2, 3038
Value range (Signal 1) 0 to 65 535
Value range (PWM signal) 0 to 100 %
Output frequency Freely selectable

Example
A PWM output at a frequency of 550.0 Hz is required. The input signal has a value range of 0 to 2500. However, as of a value of 2400 a 100-% PWM should already be output.
The parameters of the signal generator are then as follows:
- Frequency_1 = (550, 0 Hz) x 10 (on account of 0.1 Hz resolution) = 5500
- 100 % value_1 = 2400

A PWM output takes place with 2400 steps from 0 to 100 %.





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