Hybrid Drive Systems for Vehicles ion - LTH ht17/Lectures/EHS_L3_2017_conv.pdf · Hybrid Drive...
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Industrial Electrical Engineering and Automation © Mats Alaküla EHS Hybrid Drive Systems for Vehicles • L3 – Non ideal vehicle components – The conventional vehicle
Transcript of Hybrid Drive Systems for Vehicles ion - LTH ht17/Lectures/EHS_L3_2017_conv.pdf · Hybrid Drive...
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Hybrid Drive Systems for Vehicles
• L3
– Non ideal vehicle components
– The conventional vehicle
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So far
• No ICE efficiency and limitation model
• No transmission efficiency model
• Modelling needed !
– Today the ICE and the transmission
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ICE combustion principles
• Otto
– Balanced fuel/air ratio
– Injection, ignition and throttle controlled
• Diesel
– No throttle
– Direct diesel injection
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Primary energy converters – The
ICE
• Reciprocating or rotating
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ICE – combustion cycles
• Four stroke
• Two stroke
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ICE modelling
• Efficiency in stationary operation
OTTO DIESEL
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ICE Optimal working point
P = mechanical power
RPMNm
RPMNm
RPMNm
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ICE Dynamics
• Look up tables only true in stationary operation
• In a transient, several phenomena cause deviations: – Wall wetting
– Air flow dynamics
– …
• Quasi stationary OK, slower than e.g. 0.5…1 second time constant.
• Possible in Hybrid Vehicles. Not really in conventional vehicles.
• Soot att to high fuel/air mixtures, especially diesel. – ”Getting up through the soot-map”
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Transmissions (Manual)
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Transmissions (Dual Clutch)
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Transmissions (CVT)
• Continuously Variable Transmission
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Transmissions (Aut w torque conv)
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Generator load
• Apart from the
drivers torque
requirement:
– The Aux Power is
recalculated into a
torque and added to
the torque reference
– The corresponding
load torque is
subtracted from the
ICE output torque
© Mats Alaküla EHS
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Modelling of the transmission in the
Simulation program
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Manual transmission gear shift
strategy
1. The desired ICE power is calculated
2. The corresponding ICE Torque and
Speed is picked
3. Based on vehicle speed and desired ICE
speed, the best operating point for the
ICE is determined.
4. The real (available) gear position with
closest gear ration is selected
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To Simulink
