A vehicle power control system includes a driving force control unit configured to limit a driving force during acceleration of a vehicle when the vehicle is in a predetermined power control driving state. The driving force control unit includes a notification unit configured to tactilely notify a driver via a throttle manipulator that a driving force limit state occurs during the acceleration of the vehicle.

A vehicle power control system includes a driving force control unit configured to limit a driving force during acceleration of a vehicle when the vehicle is in a predetermined power control driving state. The driving force control unit includes a notification unit configured to tactilely notify a driver via a throttle manipulator that a driving force limit state occurs during the acceleration of the vehicle.

A vehicle drive system includes a slip acquisition unit that acquires occurrence of excessive slip, an addition slip point calculating unit that calculates addition slip points in a time-discrete manner, based on having acquired that the excessive slip has occurred, a cumulative slip point calculating unit that accumulates the addition slip points and calculates a cumulative slip point over time, a drive state switching unit that switches between 2WD and AWD based on cumulative slip points and a drive state switching threshold value, and a cumulative slip point resetting unit triggered by a lateral acceleration correlation value of the vehicle reaching a lateral acceleration threshold value or higher, or a drive force correlation value of the drive wheels reaching a drive force correlation threshold value or higher, to reset the cumulative slip point to a value smaller than the drive state switching threshold value.

A vehicle drive system includes a slip acquisition unit that acquires occurrence of excessive slip, an addition slip point calculating unit that calculates addition slip points in a time-discrete manner, based on having acquired that the excessive slip has occurred, a cumulative slip point calculating unit that accumulates the addition slip points and calculates a cumulative slip point over time, a drive state switching unit that switches between 2WD and AWD based on cumulative slip points and a drive state switching threshold value, and a cumulative slip point resetting unit triggered by a lateral acceleration correlation value of the vehicle reaching a lateral acceleration threshold value or higher, or a drive force correlation value of the drive wheels reaching a drive force correlation threshold value or higher, to reset the cumulative slip point to a value smaller than the drive state switching threshold value.

A method for determining a maximum adhesion limit between a tire and a substrate on which the tire is running in a longitudinal direction. The method includes detecting an instantaneous slip of the tire; detecting an instantaneous longitudinal force on the tire; determining an instantaneous coefficient of adhesion; forming a tuple from the detected slip and determined instantaneous coefficient of adhesion; and determining the adhesion limit. The adhesion limit is determined on the basis of the slope of a straight line passing through the origin and the tuple, if the slip is less than a first threshold value, or on the basis of the slope of a tangent passing through the tuple, if the slip is between the first threshold value and a second threshold value, or directly on the basis of the instantaneous coefficient of adhesion, if the slip is greater than the second threshold value.

A method for determining a maximum adhesion limit between a tire and a substrate on which the tire is running in a longitudinal direction. The method includes detecting an instantaneous slip of the tire; detecting an instantaneous longitudinal force on the tire; determining an instantaneous coefficient of adhesion; forming a tuple from the detected slip and determined instantaneous coefficient of adhesion; and determining the adhesion limit. The adhesion limit is determined on the basis of the slope of a straight line passing through the origin and the tuple, if the slip is less than a first threshold value, or on the basis of the slope of a tangent passing through the tuple, if the slip is between the first threshold value and a second threshold value, or directly on the basis of the instantaneous coefficient of adhesion, if the slip is greater than the second threshold value.

A control method for a motor-driven vehicle is provided. The method includes calculating a correction torque of a drive motor through a difference between speeds of wheels or a variance rate of the difference between speeds of the wheels and comparing a calculated correction torque with a current required torque of the drive motor. When the calculated correction torque is greater than the current required torque, the drive motor is operated based on the current required torque. When the calculated correction torque is less than or equal to the current required torque, the drive motor is operated based on the calculated correction torque, or the required torque of the drive motor is corrected to correspond to the calculated correction torque and the drive motor is operated based on a corrected required torque of the drive motor.

A computer system including a processor device configured to adjust a torque applies to a first wheel to a vehicle is provided. The processor device is configured to estimate, a variation in rotational speed of a first drive shaft. The first drive shaft is driven by a second drive shaft by rotating a mechanical joint. The mechanical joint is drivingly connected to both the first drive shaft and the second drive shaft. The processor device is configured to, based on the variation in rotational speed of the first drive shaft and a current speed of the vehicle, estimate a target slip for the first wheel. The processor device is further configured to, based on the estimated target slip for the first wheel, adjust the torque applied to the first wheel.

A method for the drive control of actuators of at least one wheel of a vehicle. The method includes: sensing a desired acceleration; sensing a vehicle velocity of the vehicle; sensing a wheel velocity of the wheel determining a status description of the wheel from the wheel velocity and a wheel acceleration; determining a first value of a target wheel acceleration from the status description, a slip of the wheel, and the desired acceleration; determining a second value of the target wheel acceleration from the wheel velocity, the wheel acceleration and the slip, wherein the second value is a function of correction factors of at least one matrix; and determining a third value of the target wheel acceleration, which value controls the actuators of the at least one wheel, wherein the third value is a function of the first value and of the second value.

A method is provided for determining whether or not ground contact loss is imminent for a wheel of a vehicle, the vehicle including a vehicle body having a vertical extension in a vertical direction, the wheel being allowed to be subjected to a relative vertical displacement, in the vertical direction, in relation to the vehicle body, the vehicle further being such that a maximum value of a vertical displacement of the wheel relative to the vehicle body is limited to a relative vertical displacement limit, the method including determining an actual relative vertical displacement of the wheel relative to the vehicle body, determining a limit margin as the difference between the actual relative vertical displacement and the relative vertical position limit, and determining that ground contact loss is imminent for a wheel if the limit margin is within a predetermined vertical threshold range.