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<imgvspace="5" hspace="5" src="BatteryElectricVehicleModelOverview_04.png" alt=""><p><h3>Table based battery</h3></p>
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<p>The table based battery model tabulates battery characteristics as functions of state of charge (SOC) and temperature and scales the characteristics upto the capacity of the pack. For quick deployment the Battery block has a selection of predefined battery characteristics.</p>
<p>The battery management system (BMS) manages all the battery operations and keeps the battery within operational limits. The BMS maintains the current, voltage, and temperature of the pack within safe limits during the charging and discharging operations. In this example, the BMS controls the circuit breakers to protect the battery pack based on the pack sensor data and on estimated parameters such as the state of charge (SOC) and the current limits for charging and discharging.</p>
<ahref="matlab:open_system(%22BEVsystemModel%22);open_system('BEVsystemModel/Vehicle/Rear%20Motor%20(EM2)');">Open Rear Motor Subsystem</a>
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</p>
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<imgvspace="5" hspace="5" src="BatteryElectricVehicleModelOverview_07.png" alt=""><p>The electric motors are connected to the battery high voltage bus. The Emotors are connected or disconnected from the battery based on relay signal from the BMS which is connected to the fault port of the Motor & Drive block. The plant model tracks a torque demand generated by the vehicle controller in close loop to reach a speed setpoint. You can load tabulated data of the speed and time to track a speed profile. This tabulated profile can be a standard drive cycle in the Drive Cycle Source block or a real drive cycle data from test runs. Output from the Emotor block goes to a gearbox and then to the wheel. The signals are passed to other components via Simscape Bus.</p>
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<p>The electric motor loss map is generated using the PMSM test bench, as described in <ahref="matlab:open('PMSMmotorTestBench.mlx');">PMSM Thermal Test Bench for Battery Electric Vehicle.</a>
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<p>The electric motor loss map is generated using the PMSM test bench, as described in <ahref="matlab:open('generateDULossMap.mlx');">PMSM Thermal Test Bench for Battery Electric Vehicle.</a>
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</p>
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<p>
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<ahref="matlab:open_system(%22BEVsystemModel%22);open_system('BEVsystemModel/Vehicle/Front%20Motor%20(EM1)');">Open Front Motor Subsystem</a>
<imgvspace="5" hspace="5" src="BatteryElectricVehicleModelOverview_11.png" alt=""><p>The heater adds a fixed amount of heat to the coolant in the circuit.</p>
<imgvspace="5" hspace="5" src="BatteryElectricVehicleModelOverview_12.png" alt=""><p>The pump and the valves are actuated based on the coolant temperature and whether battery requires cooling or heating. When the temperature of the coolant in the Emotor is low, then the coolant bypasses the radiator and keeps recirculating to increase the temperature. If the temperature is above a threshold value, coolant passes through the radiator. Similarly, when the battery temperature is above a threshold value the coolant passes through the chiller to cool the battery quickly. A positive temperature coefficient (PTC) heater increases the temperature of the battery in low ambient temperature conditions. Once the battery temperature is high, the heater is switched off as the battery can sustain the temperature.</p>
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<p>
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<ahref="matlab:load_system(%22Controller_HVAC%22);open_system('Controller_HVAC/Cabin%20Control/Cabin%20Air%20Control');">Open Thermal Control Subsystem</a>
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<ahref="matlab:load_system(%22Controller%22);open_system('Controller/Cabin%20Control/Cabin%20Air%20Control');">Open Thermal Control Subsystem</a>
<p>The battery powers the cooling or heating of the cabin. In near zero ambient temperature conditions, heating the cabin consumes 10-15% of the battery capacity. The PTC heater, cooler, and the blower are in loop. The blower circulates the air from the vent through the cabin to heat or cool the cabin.</p>
<imgvspace="5" hspace="5" src="BatteryElectricVehicleModelOverview_14.png" alt=""><p>The cabin loses heat to the environment through the vehicle door, windows, and roof.</p>
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<p>The Scenarios subsystem sets the cabin setpoint temperature and the AC on/off control. The HVAC controller modulates the air flow in the cabin through the vent. The heater and cooler draw the required power from the main battery high voltage bus.</p>
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