Abstract: A torque security system for a vehicle is provided. The system receives a signal from a sensor coupled to a motor shaft of an electric motor and determines an acceleration of the electric motor, based on the signal from the sensor that indicates an amount of rotation of the motor shaft. The system determines an internal torque between the motor shaft and an input gear coupled to the motor shaft, based on the acceleration of the electric motor and an inertia of the electric motor and a gearbox. The powertrain of the vehicle comprises the gearbox and the electric motor, and the input gear couples the electric motor to the gearbox. The system determines whether the internal torque exceeds a threshold torque, and in response to determining that the internal torque exceeds the threshold torque, the system reduces power output to the electric motor. The system also diagnoses the health of the gearbox.

Abstract: Systems and methods are provided herein for controlling the speed on each wheel of a vehicle, possibly operating a vehicle in a speed control mode. In response to receiving input to engage speed control mode and receiving an accelerator pedal input, the system determines a target wheel speed based on the accelerator pedal input, monitors wheel speed of each of a plurality of wheels and determines, for each monitored wheel, a difference based on the monitored wheel speed and the target wheel speed. A torque is provided to each of the plurality of wheels based on the respective difference to achieve the target wheel speed.

Abstract: High voltage discharge is provided. A system can include an electric motor of an electric vehicle electrically connected to a capacitor. A switching component can be connected with and intermediary to the electric motor and the capacitor. A controller can cause the switching component to enter a first state to cause the electric motor to convert electrical power of the capacitor to mechanical power to propel the electric vehicle, or convert mechanical power from a drive system of the electric vehicle to electrical power to charge the capacitor. The controller can cause the switching component to enter, in response to detection by the controller of an indication to discharge the capacitor, a second state to isolate the electric motor from the capacitor.

Abstract: Systems and methods for controlling a dual active bridge converter are disclosed herein. An output voltage of a dual active bridge converter is sensed. Based at least in part on the output voltage, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter is computed. A plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, are caused to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in the output voltage.

Abstract: Systems and methods for estimating input current are provided, particularly when input currents are applied to an electric motor of a motor system. An Electric Control Unit (ECU), according to one implementation, is configured to control the motor system. The ECU is configured to store computer logic having instructions that, when executed, cause one or more processing devices to obtain a duty cycle parameter at an output of the ECU. The duty cycle parameter, for example, relates to control actions enforced on one or more switches of a power electronics circuit of the motor system. Based on the duty cycle parameter, the instructions further cause the one or more processing devices to estimate an input current provided to the electric motor of the motor system. A more accurate input current estimation may thereby be used to better estimate torque.

Abstract: A system is configured to manage motor engagement in a vehicle by determining to engage a disengaged motor shaft with a drivetrain, and in response, activating a feedback controller based on a speed of the motor shaft and activating a feedforward controller. The system determines at least one metric for modifying an output of the feedforward controller. The at least one metric is based on the speed of the motor shaft and the desired speed, and may be applied as a gain to the output of the feedforward controller. The system generates a command based on the feedback controller, the feedforward controller, and the at least one metric, and causes the motor shaft and the drivetrain to be engaged based on the speed of the motor shaft and the desired speed. The system nulls output of the feedforward controller as the speed of the motor shaft approaches the desired speed.

Abstract: A system is configured to manage motor engagement in a vehicle by determining to engage a disengaged motor shaft with a drivetrain, and in response, activating a feedback controller based on a speed of the motor shaft and activating a feedforward controller. The system determines at least one metric for modifying an output of the feedforward controller. The at least one metric is based on the speed of the motor shaft and the desired speed, and may be applied as a gain to the output of the feedforward controller. The system generates a command based on the feedback controller, the feedforward controller, and the at least one metric, and causes the motor shaft and the drivetrain to be engaged based on the speed of the motor shaft and the desired speed. The system nulls output of the feedforward controller as the speed of the motor shaft approaches the desired speed.

Abstract: Testing connections to phase windings of an electric motor upon startup includes, prior to entering a RUN state in which motor power commands are accepted from a user to perform work, applying to each respective phase of the electric motor a respective test voltage signal, measuring in each respective phase a respective current induced by the respective test voltage signal, and preventing entry into the RUN state when at least one values representative of a respective current is below the respective predetermined threshold.

Abstract: A system is configured to manage motor engagement in a vehicle by determining to engage a disengaged motor shaft with a drivetrain, and in response, activating a feedback controller based on a speed of the motor shaft and activating a feedforward controller. The system determines at least one metric for modifying an output of the feedforward controller. The at least one metric is based on the speed of the motor shaft and the desired speed, and may be applied as a gain to the output of the feedforward controller. The system generates a command based on the feedback controller, the feedforward controller, and the at least one metric, and causes the motor shaft and the drivetrain to be engaged based on the speed of the motor shaft and the desired speed. The system nulls output of the feedforward controller as the speed of the motor shaft approaches the desired speed.

Abstract: Testing connections to phase windings of an electric motor upon startup includes, prior to entering a RUN state in which motor power commands are accepted from a user to perform work, applying to each respective phase of the electric motor a respective test voltage signal, measuring in each respective phase a respective current induced by the respective test voltage signal, and preventing entry into the RUN state when at least one values representative of a respective current is below the respective predetermined threshold.

Abstract: Testing connections to phase windings of an electric motor upon startup includes, prior to entering a RUN state in which motor power commands are accepted from a user to perform work, applying to each respective phase of the electric motor a respective test voltage signal, measuring in each respective phase a respective current induced by the respective test voltage signal, and preventing entry into the RUN state when at least one values representative of a respective current is below the respective predetermined threshold.

Abstract: Systems and methods for controlling a dual active bridge converter are disclosed herein. An output voltage of a dual active bridge converter is sensed. Based at least in part on the output voltage, a target intra-bridge phase shift amount between two bridges of the dual active bridge converter is computed. A plurality of switch control signals, which are provided to respective switches of the dual active bridge converter, are caused to switch according to a time-based switching sequence based on the target intra-bridge phase shift amount to compensate for variations in the output voltage.

Abstract: Various disclosed embodiments include illustrative controller modules, direct current (DC) fast charging devices, and methods. In an illustrative embodiment, a controller module for a DC-DC converter includes a controller and computer-readable media configured to store computer-executable instructions configured to cause the controller to: receive an input voltage, an output voltage, and a requested power value.

Abstract: Systems and methods are provided herein for controlling the speed on each wheel of a vehicle, possibly operating a vehicle in a speed control mode. In response to receiving input to engage speed control mode and receiving an accelerator pedal input, the system determines a target wheel speed based on the accelerator pedal input, monitors wheel speed of each of a plurality of wheels and determines, for each monitored wheel, a difference based on the monitored wheel speed and the target wheel speed. A torque is provided to each of the plurality of wheels based on the respective difference to achieve the target wheel speed.

Abstract: A torque security system for a vehicle is provided. The system receives a signal from a sensor coupled to a motor shaft of an electric motor and determines an acceleration of the electric motor, based on the signal from the sensor that indicates an amount of rotation of the motor shaft. The system determines an internal torque between the motor shaft and an input gear coupled to the motor shaft, based on the acceleration of the electric motor and an inertia of the electric motor and a gearbox. The powertrain of the vehicle comprises the gearbox and the electric motor, and the input gear couples the electric motor to the gearbox. The system determines whether the internal torque exceeds a threshold torque, and in response to determining that the internal torque exceeds the threshold torque, the system reduces power output to the electric motor. The system also diagnoses the health of the gearbox.

Abstract: A system is configured to manage motor engagement in a vehicle by determining to engage a disengaged motor shaft with a drivetrain, and in response, activating a feedback controller based on a speed of the motor shaft and activating a feedforward controller. The system determines at least one metric for modifying an output of the feedforward controller. The at least one metric is based on the speed of the motor shaft and the desired speed, and may be applied as a gain to the output of the feedforward controller. The system generates a command based on the feedback controller, the feedforward controller, and the at least one metric, and causes the motor shaft and the drivetrain to be engaged based on the speed of the motor shaft and the desired speed. The system nulls output of the feedforward controller as the speed of the motor shaft approaches the desired speed.

Abstract: Various disclosed embodiments include illustrative drive unit controllers, drive units, and vehicles. In an illustrative embodiment, a drive unit controller includes a first component configured to receive heat request and vehicle status information. A second component is configured to initiate a battery heat generation mode responsive to the received heat request and the vehicle status information.

Abstract: Various disclosed embodiments include illustrative systems for performing hill stall/start assist functions. An illustrative drive unit controller receives a zero-speed command and electric motor information, generates a torque command based on the received zero-speed command and the electric motor information, and instructs a drive unit inverter for an electric motor in response to the generated torque command.

Abstract: A modified alloy powder includes a powdered alloy; and a carbide powder, mixed in the powdered alloy; wherein the carbide powder has a particle size smaller than that of the powdered alloy, and the carbide powder is dedicated to powder bed selective laser melting and laser metal deposition technology. Being used as a grain refiner and a grain growth inhibitor, the effect of refinement in the grain size of final products and improvement of the workpiece strength can be achieved.

Abstract: Methods, apparatuses, and computer program products for overlaying multisource media in VRAM are described. The primary media source is rendered in VRAM by an application program, and then the secondary media source(s) are rendered and blended to the primary source in VRAM at the same location of the primary source in VRAM, so no extra buffer is needed. This improves system performance and reduces power consumption, through reduced system bus, system memory, and CPU usage.