Citroen C Zero Traction Currents
Description
This research investigates the characteristics of traction currents of a Citroën C-Zero. The battery pack consists of 88 cells connected in series with a nominal cell capacity of 50Ah. We characterized the amplitude variations, the frequency content, and temporal patterns of traction currents during six driving scenarios: 1. Parking mode: Vehicle stationary with auxiliary systems active 2. Acceleration: High acceleration from standstill to approximately 50km/h 3. Regenerative braking: Controlled deceleration from approximately 50km/h to standstill 4. Constant velocity: Steady--state driving at approximately 25km/h 5. Urban driving: Moderate acceleration and deceleration patterns 6. Dynamic driving: High-performance driving with rapid acceleration and deceleration A Hioki 3275 current clamp, featuring a bandwidth of 2MHz, was connected to the high-voltage cable near to the traction inverter input to record the current. The output signal from the current clamp was measured using a PicoScope 5444D oscilloscope at sample frequencies ranging from 50kHz to 20MHz. Positive currents indicate battery discharge (acceleration), while negative currents represent battery charge (recuperation). Battery-powered traction applications convert electrical energy into mechanical energy for propulsion, e.g. electric vehicles (EVs). A critical component of this systems is the traction inverter, which converts the dc battery voltage into an ac control signal, generating the rotating magnetic field into the electric motor. In EVs, traction inverters operate at switching frequencies ranging from 5 to 20kHz. The frequency of the electric motor control signal depends on the velocity of the EV. As the velocity increases, the motor's mechanical rotational frequency also increases, requiring a higher motor control frequency. Short-time Fourier transform (STFT) analysis revealed the temporal evolution of electrical frequencies below 1 kHz, corresponding to motor control signals that vary with vehicle velocity. The fundamental pulse width modulation (PWM) switching frequency was identified at 7.1 kHz, with associated harmonics and intermodulation products clearly visible in the frequency spectra. For detailed information about data structure, experimental protocols, and data processing methodologies, refer to the README.md file included with the dataset.
Files
Institutions
- Universitat Bayreuth Fakultat fur Ingenieurwissenschaften
- Infineon Technologies AG
- Virtual Vehicle Research GmbH