Vehicle Electrification - April 18, 2012 - 10
A move to ‘more electric’ engines
Comparison of generator types.
At the same time, the input current in the U-phase of the “B” system is adjusted automatically. In the three-phase/dual winding motor system, current sensors detect the electric current flowing through each phase (U-, V-, and W-phases), and the detected current signals are fed back to the controller via an interface circuit. The feedback current signals in the “A” and “B” systems are combined in the interface circuit, whereupon the mean value of the feedback current is calculated and the difference between the mean value and current command value is input to the controller. Subsequently, the input currents for the “A” and “B” systems are automatically adjusted to maintain a mean value corresponding to the command. If a single failure occurs in the “A” system— i.e., its feedback current drops to zero—the input current for the “B” system is automatically doubled, keeping the mean value unchanged. The motor can generate the same torque for the pump, which therefore continues to function at the same speed and maintains a constant discharge flow. The MEE electric fuel pump system incorporating this active-active control architecture realizes a one-fail operational system with no change in engine speed or thrust.
Two fail-safe systems realized by MEE
The ability to continue operating an engine even after dual failures in the motor system offers clear advantages in engine safety and reliability. The proposed MEE system will incorporate an advanced fault-tolerant design for a redundant three-phase brushless motor system, allowing the motor-driven fuel pump to continue supplying a certain amount of fuel and thereby prevent engine shutdown, even in the event of dual failures. The active-active control architecture allows the motor system to continue functioning when a second failure occurs in another phase after an initial failure in one phase. However, if dual failures occur in the same phase of both “A” and “B” systems, motor rotation will halt or become unstable.
SAE Vehicle Electrification evsae.com
10
http://www.evsae.com
Vehicle Electrification - April 18, 2012
Table of Contents for the Digital Edition of Vehicle Electrification - April 18, 2012
Vehicle Electrification - April 18, 2012
Putting electrification to work
A move to ‘more electric’ engines
2012-13 Hybrid Vehicles Guide
Tech Report
What’s on evsae.com
Vehicle Electrification - April 18, 2012 - Vehicle Electrification - April 18, 2012
Vehicle Electrification - April 18, 2012 - 1
Vehicle Electrification - April 18, 2012 - 2
Vehicle Electrification - April 18, 2012 - 3
Vehicle Electrification - April 18, 2012 - Putting electrification to work
Vehicle Electrification - April 18, 2012 - 5
Vehicle Electrification - April 18, 2012 - A move to ‘more electric’ engines
Vehicle Electrification - April 18, 2012 - 7
Vehicle Electrification - April 18, 2012 - 8
Vehicle Electrification - April 18, 2012 - 9
Vehicle Electrification - April 18, 2012 - 10
Vehicle Electrification - April 18, 2012 - 11
Vehicle Electrification - April 18, 2012 - 12
Vehicle Electrification - April 18, 2012 - 13
Vehicle Electrification - April 18, 2012 - 2012-13 Hybrid Vehicles Guide
Vehicle Electrification - April 18, 2012 - 15
Vehicle Electrification - April 18, 2012 - 16
Vehicle Electrification - April 18, 2012 - 17
Vehicle Electrification - April 18, 2012 - 18
Vehicle Electrification - April 18, 2012 - 19
Vehicle Electrification - April 18, 2012 - Tech Report
Vehicle Electrification - April 18, 2012 - 21
Vehicle Electrification - April 18, 2012 - 22
Vehicle Electrification - April 18, 2012 - 23
Vehicle Electrification - April 18, 2012 - 24
Vehicle Electrification - April 18, 2012 - 25
Vehicle Electrification - April 18, 2012 - 26
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Vehicle Electrification - April 18, 2012 - 28
Vehicle Electrification - April 18, 2012 - 29
Vehicle Electrification - April 18, 2012 - What’s on evsae.com
Vehicle Electrification - April 18, 2012 - 31
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https://www.nxtbook.com/nxtbooks/sae/09AEMD1014
https://www.nxtbook.com/nxtbooks/sae/OFHOCT09
https://www.nxtbook.com/nxtbooks/sae/AUTOOCT09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0930
https://www.nxtbook.com/nxtbooks/sae/09AEMD0916
https://www.nxtbook.com/nxtbooks/sae/AUTOSEP09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0902
https://www.nxtbook.com/nxtbooks/sae/09AEMD0819
https://www.nxtbook.com/nxtbooks/sae/OFHAUG09
https://www.nxtbook.com/nxtbooks/sae/09AEMD0805
https://www.nxtbook.com/nxtbooks/sae/AUTOAUG09
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