A speed limiting device may include a communicator configured to communicate with a tire air pressure monitor, a steering angle detector, a yaw rate detector and an engine controller of a vehicle; a storage configured to store limited speed information corresponding to slip information, in a form of a table; and a controller configured to acquire slip information based on a steering angle detected by the steering angle detector and a yaw rate detected by the yaw rate detector when abnormality information is received from the tire air pressure monitor, to check a limited speed corresponding to the acquired slip information, and to output the checked limited speed to the engine controller.

A system and method of controlling engine clutch engagement during TCS operation of a hybrid vehicle are provided. The method includes determining whether a TCS is operating and upon determining that the TCS is operating, determining a compensation value for early engagement of an engine clutch during the TCS operation based on a difference between a front wheel speed and a rear wheel speed and a slip amount of front wheels. Additionally, the method includes determining whether engagement of the engine clutch is capable of being started based on the compensation value and starting the engine clutch engagement. Since the engagement of the engine clutch is controlled based on the speed of non-drive wheels during TCS operation, the engagement stability of the engine clutch is improved and the amount of time required to engage the engine clutch is decreased.

A sliding feedback control system of a vehicle is provided. The system includes: an electric motor; a power battery; a battery manager connected with the power battery, and configured to obtain a maximum charging power of the power battery; and a motor controller connected with the electric motor, and configured to obtain maximum feedback torque values of the motor controller and the electric motor, to convert the maximum charging power of the power battery into a maximum feedback torque value of the power battery, to determine a minimum of the maximum feedback torque values as a first feedback torque value, to obtain a second feedback torque value, and to determine a final feedback torque value of the electric motor as a minimum of the first and second feedback torque values, such that the electric motor controls the vehicle to perform the sliding feedback operation according to the final feedback torque value.

A method of controlling an engine driving force during operation of a traction control system (TCS) of a hybrid vehicle includes: calculating a driver-demanded torque based on a detection signal of an accelerator position sensor (APS), determining whether the TCS is operating, and, upon determining that the TCS is operating, determining engine driving force based on a TCS-demanded torque according to operation of the TCS. Accordingly, the engine driving force (i.e., an engine operating point) is determined based on the TCS-demanded torque requested in order to reduce the torque of the hybrid vehicle during the TCS operation, so as to improve fuel efficiency by reducing fuel consumption during the TCS operation.

A drive control system for a work vehicle is provided with a power transmission device that drives front wheels and rear wheels, a request determination unit, and a drive mode control unit. The power transmission device has a drive mode switching mechanism that performs drive mode switching between a four-wheel drive mode in which drive power is transmitted to front wheels and rear wheels and a two-wheel drive mode in which drive power is transmitted to only the rear wheels. The request determination unit determines a necessity for an increase in drive power on a contact area of the work vehicle, and outputs an increase request based on the determination result. The drive mode control unit outputs a drive mode switching request for switching to the four-wheel drive mode to the drive mode switching mechanism, in response to output of the increase request.

A method for controlling torque reduction of a hybrid electric vehicle including a motor and an engine as a power source includes: determining whether a request for a driving torque limit by a traction control system (TCS) is generated; calculating a motor torque command when the request for the driving torque limit by the TCS is generated; calculating an engine torque command based on the calculated motor torque command; calculating an available amount of charging of the motor according to a state of charge (SOC) of a battery of the hybrid electric vehicle; and determining a final motor torque command and a final engine torque command based on the calculated available amount of charging of the motor.

A method for controlling torque reduction of a hybrid electric vehicle including a motor and an engine as a power source includes: determining whether a request for a driving torque limit by a traction control system (TCS) is generated; calculating a motor torque command when the request for the driving torque limit by the TCS is generated; calculating an engine torque command based on the calculated motor torque command; calculating an available amount of charging of the motor according to a state of charge (SOC) of a battery of the hybrid electric vehicle; and determining a final motor torque command and a final engine torque command based on the calculated available amount of charging of the motor.

An electronic control unit is configured to, when the electronic control unit determines that any one of a first condition and a second condition is satisfied, preferentially execute lower limit speed ratio control. The first condition is a condition that, after the electronic control unit starts shift prohibition control, a wheel lock has occurred before a condition for cancelling the shift prohibition control is satisfied. The second condition is a condition that, after the electronic control unit starts the lower limit speed ratio control, a wheel spin has occurred before a condition for cancelling the lower limit speed ratio control is satisfied.

A device for operating an all-wheel-drive agricultural commercial vehicle with a driven rear axle and a front axle that can be engaged for performing an all-wheel-drive mode. A control unit determines, during the all-wheel-drive mode, a front wheel slip parameter that characterizes a drive wheel slip occurring on the front axle of the agricultural commercial vehicle. The control unit deactivates the all-wheel-drive mode independent of the driver if this unit detects that the determined front wheel slip parameter is greater than a specified threshold value.