Specified Speed on the Electronic Engine Control Unit ECU-7 (ADEC/ MTU Engine)

1060 - Specified Speed

Figure 1.1 - Single Parameter (2.1060)

#Specified Speed Functional 

The Specified Speed is the setpoint value for the speed control loop of the Engine governor. This value is calculated from a speed setpoint raw value.

#Selection of the Speed Setpoint Source

Depending on the application, different sources can be selected for specifying the speed setpoint raw value. This is carried out via the process variable 2.1060.052 (remote/normal operation). There are seven different options for selecting the speed setpoint source:

a). Analog speed setpoint via CAN (Analog CAN)

→As with the analog, absolute speed setpoint on an analog or frequency input, the analog value is assigned a speed setpoint raw value. This is transferred, however, on the CAN bus.

b). Up/Down button on the Engine governor (Up/Down But)

c). Up/Down button signals on the CAN bus (Up/Down CAN)

→The current speed setpoint value is increased or reduced via the corresponding signal. If the signal is pending for a long time, the setpoint is changed along a ramp. With genset applications, the speed setpoint is made about the fixed rated speed. The Up/Down buttons are used to make speed changes around the rated speed (within defined limits). 

d). Analog absolute speed setpoint at one analog input of the governor (Analog abs.)

e). Analog absolute speed setpoint at one frequency input of the governor (Frequency)

→A speed setpoint raw value is assigned to one analog signal (current, voltage or frequency).

f). Analog relative speed setpoint at one analog input of the governor (Analog rel.)

 →A speed difference is added to (or subtracted from) a fixed rated speed. This speed difference is calculated from the analog signal (current, voltage or frequency).

g). Control lever positions via CAN (CAN Pedal)

→ A speed value is assigned to a specific control lever position. The control lever position value is transferred on the CAN bus.

Figure 1.2 - Analog CAN (2.1060.150-153)

2.1060.150 - Source for local (normal operation)

2.1060.151 - Source for local (emergency operation) 

2.1060.152 - Source for remote (normal operation)

2.1060.153 - Source for remote (emergency operation)

#Speed Limits

The speed setpoint can have an upper and lower limit. If the calculated specified speed is outside these limits, the setpoint is set to the limit value:

2.1060.042 (Engine Speed Demand Min) - Minimum permissible speed setpoint (600-800 rpm)

2.1060.043 (Engine Speed Demand Max) - Maximum permissible speed setpoint (limit max. 2000 rpm)

#Limitation of the Effective Speed Setpoint

2.1060.044 (Engine Speed Demand Min Eff) - Minimum permissible speed setpoint (600-800 rpm)

2.1060.045 (Engine Speed Demand Max Eff) - Maximum permissible speed setpoint (limit max. 2000 rpm). Refer to the Figure 1.1 above.

#Specified Speed Limitation

The Protection module can be used to limit the specified speed to a maximum speed (e.g. if the max. coolant temperature is exceeded or a turbocharger speed sensor fails, further conditions are also possible):

2.1060.430 (Speed Demand Limitation Value) - Limited specified speed (limit max. 2000 rpm) 

Figure 1.3 - Speed Demand Limitation Value

#Idle Speed Increase

A binary signal (binary input of the ECU or CAN) can be used to increase the minimum effective specified speed (and thus the idle speed) by an adjustable value. The specified speed is changed along two adjustable ramps:

2.1060.147 (Increase Idle Limit Value) - Value of the increased speed (rpm)

2.1060.148 (Increase Idle Ramp) - Gradient of the ramp for the speed increase after activation of the binary signal (rpm/s)

2.1060.149 (Increase Idle Ramp Down - Gradient of the ramp for the speed decrease after activation of the binary signal (rpm/s)

2.1060.143 (CAN Increase Idle Limit)

2.1060.144 (CAN Increase Idle Ramp Down)

2.1060.145 (CAN Increase Idle Ramp Up)

Figure 1.4 - Increase Idle Limit

#Speed Drop

The speed droop influences the specified speed as a function of the Engine power. It is possible to switch between two different (adjustable) speed droops. Refer to Figure 1.4 above.

2.1060.202 - Speed droop 1 (Value in %)

2.1060.204 - Speed droop 2 (Value in %)

2.1060.205 - Dynamic speed droop

Read More:

Program Startup with the Dialog System DiaSys (MTU Engine/ ECU-7 ADEC)

Start Data Recording using the Dialog System DiaSys (MTU Engine/ ECU-7 ADEC)

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