Abstract: A computer system is provided. The computer system comprises processing circuitry configured to: for each one of a pre-set positive speed value and a pre-set negative speed value: controlling the speed of an electrical machine to the pre-set speed value, short circuiting the electrical machine, and determining d,q currents and angular velocity of a rotor of the electrical machine during deceleration from the pre-set speed value, and wherein the processing circuitry is further configured to: determining a resolver offset based on the determined d, q currents and the determined angular velocity of the rotor.

Abstract: A computer system includes processing circuitry configured to: determine a first average of a measured current load angle of an electrical machine and a first average of a correct current load angle of the electrical machine for a plurality of positive speed values within a positive speed interval, determine a second average of the measured current load angle of the electrical machine and a second average of the correct current load angle of the electrical machine for a plurality of negative speed values within a negative speed interval, determine a resolver offset error of the electrical machine from the first and second average of the measured current load angle, and determine a resolver delay error of the electrical machine from the first and second average of the measured current load angle, from the first and second average of the correct current load angle, and from the rotor speed.

Abstract: A computer system comprising a processor device configured to switch between switching modes of a load is presented. The switching modes are a complementary switching mode and a non-complementary switching mode of an upper switch and a lower switch of a first half-bridge converter configured to provide a wanted power to a load. The processor device is configured to provide a first upper control signal to the upper switch and a first lower control signal to the lower switch as center aligned PWM-signals at a first PWM period. Responsive to determining that a current switching mode is to be changed at a second PWM period, the processor device is further configured to determine a time-shift for shifting the first upper control signal and the first lower control signal, and to provide the first upper control signal shifted by the time-shift to the upper switch and the first lower control signal shifted by the time-shift to the lower switch at the second PWM period.

Abstract: A system for controlling capacitors comprised in an at least partly electrical driven vehicle. The system comprises a converter comprising a first capacitor connected to a first side of a three-phase bridge. The system comprises a third capacitor adapted to be controlled, via a first switch, to be either connected in parallel to or disconnected from the first capacitor. The system is adapted such that, when the converter is activated and is initiated to start operating or is currently operating, the first switch is in a closed position such that the third capacitor is connected. The system is further adapted such that, when the converter is inactivated and is not in operation, the first switch is in an open position such that the third capacitor is disconnected.

Abstract: A fastening system or apparatus for securing a rail to the underlying railroad tie includes a pad, two insulators attached to the pads and two shoulders attached to the ties. An interference fit is formed between the insulators and the shoulders to capture the pad between the shoulders. The insulators are pre-attached to the pad. The mating protrusions of the shoulders and pad allows for ease of insertion such that the pad assembly can be shipped together with the underlying tie.

Abstract: A fastening system or apparatus for securing a rail to the underlying railroad tie includes a pad, two insulators attached to the pads and two shoulders attached to the ties. An interference fit is formed between the insulators and the shoulders to capture the pad between the shoulders. The insulators are pre-attached to the pad. The mating protrusions of the shoulders and pad allows for ease of insertion such that the pad assembly can be shipped together with the underlying tie.