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Installation and Operation Guide
ED-DT318B
Drive Train Systems with Traction Control, Inverter/Controller, and Motor with 2 Speed Transmission
BC353060341319en-000101
Revision D
© Danfoss | November 2020 | 56
Classified as Business
7
VCU to TCU CAN Bus
7.1
CAN Messages
CAN Messages are of two types.
•
VCU to TCU Command Messages
•
TCU to VCU Status Message
VCU to TCU Command Messages are messages that the VCU sends to the TCU to command operations. These
messages are documented in
Section 7.2
In so far as is possible, these commands will be followed. However, there are limits to how closely these
commands control the system. Some exceptions are:
•
Torque production will not exceed the limits communicated by the status message.
•
Speed in Low Gear or Reverse will not exceed 1360 rpm and may be lower depending on the limits of
the selected MCU system.
•
Speed in High Gear will not exceed 4800 rpm and may be lower depending on the limits of the selected
MCU system.
•
The TCU will have total control of torque and MCU speed during High/Low and Low/High gear shifts.
Control will be returned to the VCU once the shift is complete
•
The TCU will only respond to Forward/Reverse shift commands at very low speeds and will only allow a
shift to Reverse Gear while in High Gear if it encounters a shift failure in Low Gear.
•
Drive Torque commands will produce Regen torque if the vehicle is moving in reverse while in Forward
gear or forward while in Reverse gear.
TCU to VCU Status Messages are messages the TCU sends to the VCU to communicate the status of the TCU and
MCU. These messages are documented in
Section 7
The documentation both VCU to TCU Command Messages and TCU to VCU Status Messages use the following
conventions:
7.1.1
Abbreviations
kbps: kilobits per second
Nm:
Newton meters
mb:
millibars
rpm:
revolutions per minute
rpm/s: revolutions per minute per second (rate of acceleration)
˚C:
degrees Celsius
VDC:
Volts DC
A:
Amperes
lsb:
least significant bit
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