A riding lawn mower includes: a seat; a chassis; a walking assembly including a left second walking wheel, a right second walking wheel, a left walking motor and a right walking motor; and a walking control system for controlling the left walking motor and the right walking motor. The walking control system includes two current detection modules respectively configured to obtain sampled currents of the left walking motor and the right walking motor; the walking control system is configured to obtain a first feedback current of the left walking motor and a first feedback current of the right walking motor, and when a difference of the first feedback current of the left walking motor and the first feedback current of the right walking motor is greater than or equal to a predefined current threshold, reduce a first target voltage of the walking motor with a higher first feedback current.

Systems and methods relate to electric propulsor fault detection. An exemplary system includes at least a first inverter configured to accept a direct current and produce an alternating current, a first propulsor, a first motor operatively connected with the first propulsor and powered by the alternating current, and at least a noise monitoring circuit electrically connected with the direct current and configured to detect electromagnetic noise and disengage the at least an inverter as a function of the electromagnetic noise.

According to one aspect of the present disclosure, there is provided a power converter apparatus that includes at least two switching bridges connected to a Direct Current (DC) bus and both generating pulse-width-modulated (PWM) voltages to non-isolated outputs, and an isolation transformer having a primary winding connected across the outputs of the two switching bridges and a secondary winding connected to isolated outputs. In a non-isolated mode, the two switching bridges are configured to operate in a parallel mode, and power is transferred between the DC bus and the non-isolated outputs. In an isolated mode, the two switching bridges are configured to operate in a full bridge mode, and power is transferred between the DC bus and the isolated outputs through the transformer.

Methods and systems are provided for controlling a high power output direct current to alternating current converter for a vehicle. In one example, a method may include at a vehicle-on event, automatically operating the converter in a first power output mode, and transitioning to a different mode of operation in response to a transition request being received at a controller of the vehicle. In this way, the different mode of operation may be subject to confirmation via an operator of the vehicle, which may improve operational performance of the direct current to alternating current converter.

A safety charging system includes: a motor and an inverter which boost a voltage charged from a high-speed battery charger to a high voltage battery; a current variation amount sensor configured to detect variation amount of a current flowing in a motor coil from the high-speed battery charger; and a controller configured to determine that a rotor of the motor rotates when the variation amount of the current detected in the current variation amount sensor is greater than a reference value and perform control of interrupting a charging process.

A vehicle control apparatus mounted on a vehicle including a DC-DC converter that supplies electric power from a first battery to a second battery and an auxiliary load includes an electronic control unit configured to control an operation of the converter, determine a state of a starter switch of the vehicle, detect a user operation to the vehicle, and acquire charging status information of the second battery. The electronic control unit is configured to, when the electronic control unit detects a first operation by the user and determines that the starter switch is off, drive the converter such that the converter charges the second battery, and, when an electric power amount charged in the second battery reaches a target amount of charge set based on an amount of electric power to be consumed by the auxiliary load while the starter switch is off, stop the converter.

An inverter control device 200 includes a current control unit 210 that outputs a voltage commands (Vd*, Vq*), a modulation wave control unit 220 that generates a modulation wave based on the voltage commands (Vd*, Vq*), a pulse generation unit 230 that generates a PWM pulse for controlling an inverter 100 using a modulation wave and a carrier wave of a predetermined frequency, and a pulse shift unit 250 that corrects the phase of the PWM pulse such that the PWM pulse is output in a phase corresponding to a harmonic of a predetermined order of the modulation wave in the near-zero-cross region including the zero-cross point at which the modulation wave changes across 0.

A control method includes sequentially updating a next cycle pulse width modulation command for each of an upper switch and lower switch of a phase leg of a power converter according to an order defined by timing of a rising edge of the next cycle pulse width command for one of the switches relative to a rising edge of a previous cycle pulse width command for the one of the switches.

A vehicle may include a motor including first, second, and third windings connected to the neutral node; an inverter including first switching elements, second switching elements, third switching elements; a battery configured to receive the boosted voltage; a first current sensor; a second current sensor; a third current sensor; and a controller may determine an average duty ratio of a pulse width modulated signal based on the charging voltage and battery voltage of the battery, and determine a duty ratio of a pulse width modulated signal, and the controller may determine the duty ratio of the pulse width modulated signal provided to the first switching elements based on the average duty ratio of the pulse width modulated signal provided to the inverter, to the second switching elements, and to the third switching elements when the first current sensor fails.

A vehicle includes a high-voltage system circuit including a high-voltage battery, a low-voltage system circuit including an updater and a low-voltage battery having a lower output voltage than the high-voltage battery, a DC-DC converter coupled between the two circuits, a controller that controls the two circuits and the DC-DC converter, and a wireless communication device. The updater updates a program of an update-target device. The wireless communication device wirelessly receives update data for the program. The controller calculates time taken for updating the program, based on information on the update data. The controller causes the DC-DC converter to reduce in voltage output electric power of the high-voltage battery and then supply the electric power to the low-voltage system circuit, and thus charges the low-voltage battery in accordance with the calculated time. The updater updates the program using output electric power of the charged low-voltage battery.