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were discussed and determined. The hybrid transmission controls, engine controls,
and motor controls activities were carried out by different groups and were not the
scope of this chapter.
The following were the requirements:
1. Engine Control Unit
Software interfaces with hybrid controls—part of scope
Typical engine controls software and hardware work—out of scope
Software interfaces with transmission controls—out of scope
2. Hybrid Control Unit for vehicle hybrid functionality (in scope)
Sensor(s) interfaces with hybrid control unit—This section details the re-
quirement, related to interfacing of high-voltage sensors, temperature sen-
sors, and current sensors with the electronic control unit.
High-Voltage Sensor(s)—type, operating range, resolution, supply volt-
ages, number of sensors required, interface, placement, environment oper-
ating temperature range, and enclosure requirements
Current Sensor(s)—type, operating range, resolution, supply voltages,
number of sensors required, interface, placement, environment operating
temperature range, and enclosure requirements
Temperature Sensors (s)—type, operating range, resolution, supply volt-
ages, number of sensors required, interface, placement, environment oper-
ating temperature range, and enclosure requirements
Redundant sensing—part of scope
The detailed software interface requirements document was prepared for
software variables related to sensor(s) measurement, resolution, accuracy,
error diagnostics, and local/global information handling. Also, a detailed
algorithm and controls document was prepared for controls related to local
and global software variables, error diagnostics, and software interfaces with
other software modules.
Control interfaces with hybrid control unit—in scope
Software interfaces with engine control unit—in scope
Software interfaces with transmission control unit—in scope
Embedded controls for hybrid control unit (application layer)—in scope
Algorithm for arbitration of power between internal combustion engine
and alternative energy source—in scope
Safety controls—part of scope
The following are the high-level software variables that were further de-
tailed in either the sensor interface or algorithm and controls requirements
document.
Minimum torque limit
Maximum torque limit
Torque demanded
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