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Functional Model for Electric Drives and HV Systems in Vehicles
Order-№: 31960  
Price on request
 

The functional model for electric drives and HV systems in vehicles consists of a drive module and an energy supply and control module. The HV system works with an operating voltage of 96 V. It includes a complete energy supply unit with an electronic battery management system (BMS), an integrated charger for the HV battery, a control unit with an engine management system, all of the necessary safety components, a Mennekes charging connection and an extra robust service disconnect. The HV battery, with a nominal voltage of 96 V, is equipped with 32 LiFePO4/40 Ah cells. The battery management system features a Bluetooth interface. A corresponding app (Android) can be used to display the condition (voltage, temperature, balancing rate during the charging process) of each individual battery cell.

Drive module
The drive module consists of a complete rear-axle powertrain with the gearbox from the Smart 450, 15 kW asynchronous motor, a control unit with controller (E-Car-Box), DC/DC converter, fuses, contactors and control software, and a hydraulic brake for load simulation (uphill driving).

E-Car-Box
The E-Car-Box is the core element of the drive. It houses all key components for actuating the motor in a space-saving, secure and EMC-compliant manner; these are cabled in accordance with the most stringent safety standards. In addition to the air-cooled Curtis controller for actuating the motor, it also contains the main contactor, a DC/DC converter and all necessary high- and low-voltage fuses.

Battery management system (BMS)
The battery management system monitors the lithium iron phosphate battery cells installed in the HV trainer and the extent to which they are protected against overvoltage and undervoltage during the charging process and while driving. As such, the central control unit communicates with the connected charger and motor controller via CAN interface. The battery management system features a Bluetooth module for communication between the BMS and a display instrument such as a smartphone, tablet or Bluetooth-compatible Windows PC. Apps for Windows Mobile and Android are available for download. This module enables the state of charge of the batteries and various other parameters to be monitored.

  • Observing accident prevention regulations
  • Avoiding dangers when working with electrical current and hazardous substances
  • Selecting suitable and safe testing and measuring instruments
  • Handling and using safety equipment
  • Applying manufacturer-specific test routines
  • Disconnecting high-voltage components, securing them against being switched back on, disconnecting from the voltage supply
  • Identifying the dangers of electric storage (capacitors, high-voltage batteries)
  • Identifying the general principles of electrical engineering
  • Creating system and block diagrams
  • Identifying electrical variables and their effect on the human organism
  • Troubleshooting and interpreting the diagnostics of affected systems
  • Analysing the function and interaction of components, taking into account the exchange of information between participating control units
  • Identifying system relationships using circuit diagrams and function plans
  • Analysing time-dependent variables and evaluating signal patterns
  • Applying knowledge of the principles of voltage generation (induction), rectification (half-wave and full-wave rectification), the electromotive principle and storing electrical energy
  • Assessing hazards when performing live measurements, deriving protective measures and testing the effectiveness of the electronic protective measures of the high-voltage system
  • Performing live measurements (insulation, potential equalisation and voltage drop measurements, battery cell voltages, temperature measurement)
  • Performing function testing on high-voltage systems (actuation signals of the electric motor while driving)
  • Assessing measured values and signals for plausibility and creating test records
  • Planning the diagnostics and repair of the high-voltage system and its components
  • Automotive mechatronics engineer
  • Automotive mechatronics engineer specialising in systems and high-voltage technology

Activities that can be performed on the HV functional model

  • Disconnect from the voltage supply with service disconnect
  • Ascertain disconnection from the voltage
  • Secure against switching on again
  • Measure the intermediate circuit capacitor charge and discharge curve
  • Localise defective battery cells using measurement technology
  • Replace battery modules
  • Check the connector between the cells for contact resistance
  • Perform function testing on the contactors
  • Check the safety line (interlock circuit)
  • Check the insulation monitor
  • Check the motor encoder and motor temperature sensor
  • Clearly present the load simulation (uphill driving) visually and in such a way that it can be measured
  • Program the HV controller with manual programmer or PC interface

Possible measurements

  • Phase voltage and phase signal (U, V, W) to the electric motor
  • 12 V on-board supply voltage
  • HV battery voltage
  • Potential equalisation measurement
  • Insulation resistance measurement
  • Insulation monitor signal (PWM signal)
  • Inverter intermediate circuit voltage
  • CP signal at the charging socket (communication with charging station)
  • Safety line (interlock circuit and interlock signal voltage)
  • DC/DC converter input (positive and negative)
  • DC/DC converter output (positive and negative)
  • Temperature and voltage of an individual battery cell (via BMS)
  • Current sensor signal
  • Electric motor speed and temperature sensor signal

Fathi Jamal
Maiken Kayser
Nadja Parcsami
Sheng Wang