A method for determining a contact force on a utility vehicle includes providing the utility vehicle with a first wheel axle and a second wheel axle, determining a drive slip of the second wheel axle, and a road surface-specific determination data set associated with a traction coefficient in dependence on the drive slip, and determining the contact force on the second wheel axle based on the drive slip of the second wheel axle and the road surface-specific determination data set.

A method for determining a contact force on a utility vehicle includes providing the utility vehicle with a first wheel axle and a second wheel axle, determining a drive slip of the second wheel axle, and a road surface-specific determination data set associated with a traction coefficient in dependence on the drive slip, and determining the contact force on the second wheel axle based on the drive slip of the second wheel axle and the road surface-specific determination data set.

The control device for a four-wheel drive vehicle includes a differential restriction control unit configured to cause the differential restriction device, which is enable a differential restriction degree between a front wheel rotary shaft and a rear wheel rotary shaft, to change the differential restriction degree and a braking control unit configured to cause the braking device to perform EBD control and ABS control. The braking control unit is configured to cause the braking device to suspend the EBD control when the ABS control is started while the EBD control is being performed, and the differential restriction control unit is configured to change the differential restriction degree to a third degree larger than a first degree and equal to or smaller than a second degree when the ABS control is started while the EBD control is being performed.

The control device for a four-wheel drive vehicle includes a differential restriction control unit configured to cause the differential restriction device, which is enable a differential restriction degree between a front wheel rotary shaft and a rear wheel rotary shaft, to change the differential restriction degree and a braking control unit configured to cause the braking device to perform EBD control and ABS control. The braking control unit is configured to cause the braking device to suspend the EBD control when the ABS control is started while the EBD control is being performed, and the differential restriction control unit is configured to change the differential restriction degree to a third degree larger than a first degree and equal to or smaller than a second degree when the ABS control is started while the EBD control is being performed.

The embodiments of the present application disclose a stability control system and a stability control method for a four-wheel drive electric vehicle and the four-wheel drive electric vehicle. In the stability control system, when the lateral acceleration is equal to or greater than an acceleration threshold, at least one of a first braking force signal, a second braking force signal, a first logic signal and a second logic signal is obtained. When the first logic signal is obtained, the body of the electric vehicle is controlled to keep stable. When the first braking force signal and the second logic signal are obtained, a motor is controlled to apply braking force to an outside front wheel. When the second braking force signal and the second logic signal are obtained, motors are controlled to apply braking force to the outside front wheel and an inside rear wheel.

Provided is a master cylinder unit including a communication path that causes a master cylinder and a stroke simulator to communicate with each other. The stroke simulator includes a bottomed tube-shaped simulator piston and a simulator cylinder in which a simulator piston slides. The simulator piston is such that a bottom portion of the simulator cylinder and an opening portion of the simulator piston face each other. The communication path is open over an outer circumferential portion and an inner circumferential portion of the opening portion of the simulator piston, is connected to the bottom portion of the simulator cylinder, and is provided such that the communication path extends upward in a vertical direction from the bottom portion of the simulator cylinder as approaching to a pressure chamber.

Provided is a master cylinder unit including a communication path that causes a master cylinder and a stroke simulator to communicate with each other. The stroke simulator includes a bottomed tube-shaped simulator piston and a simulator cylinder in which a simulator piston slides. The simulator piston is such that a bottom portion of the simulator cylinder and an opening portion of the simulator piston face each other. The communication path is open over an outer circumferential portion and an inner circumferential portion of the opening portion of the simulator piston, is connected to the bottom portion of the simulator cylinder, and is provided such that the communication path extends upward in a vertical direction from the bottom portion of the simulator cylinder as approaching to a pressure chamber.

A hill stop control method includes: when it is determined that a vehicle is in a park brake state, determining, by acquiring the current parameter of the vehicle, whether the vehicle is in a working condition of being prone to sliding; and when it is determined that the vehicle is in a working condition of being prone to sliding, controlling a mode switch of a transfer case to switch the current drive mode to a high-speed four-wheel drive mode having a stronger brake force or a low-speed drive mode. In this way, the automatic switching of a drive mode is realized without changing a brake system; and when stopped on a hill, friction forces between tires and the ground are increased, thereby effectively reducing the risk of sliding down a hill.

An acceleration/deceleration control apparatus includes a mode switching portion configured to switch a normal mode of performing acceleration control in response to an operation on an accelerator pedal and also performing deceleration control in response to an operation on a brake pedal, and a one-pedal mode of performing both the acceleration control and the deceleration control in response to the operation on the accelerator pedal according to a switching operation performed by a driver. Where a mode is switched from the normal mode to the one-pedal mode, one-pedal instruction switching portion (35B) of the acceleration/deceleration control apparatus outputs such one-pedal acceleration/deceleration instruction value A(Xa) that a result of adding a non-one-pedal acceleration instruction value B1(Xb) for the one-pedal mode and a one-pedal acceleration instruction value Ab(Xa) for the one-pedal mode after the mode is switched matches non-one-pedal deceleration instruction value Bn(xb) for the normal mode before the mode is switched.

An acceleration/deceleration control apparatus includes a mode switching portion configured to switch a normal mode of performing acceleration control in response to an operation on an accelerator pedal and also performing deceleration control in response to an operation on a brake pedal, and a one-pedal mode of performing both the acceleration control and the deceleration control in response to the operation on the accelerator pedal according to a switching operation performed by a driver. Where a mode is switched from the normal mode to the one-pedal mode, one-pedal instruction switching portion (35B) of the acceleration/deceleration control apparatus outputs such one-pedal acceleration/deceleration instruction value A(Xa) that a result of adding a non-one-pedal acceleration instruction value B1(Xb) for the one-pedal mode and a one-pedal acceleration instruction value Ab(Xa) for the one-pedal mode after the mode is switched matches non-one-pedal deceleration instruction value Bn(xb) for the normal mode before the mode is switched.