A brake fluid pressure control device for a includes a wheel speed acquisition device that acquires a wheel speed, a slippage amount calculation device that calculates a wheel slippage amount, and a bad road determination device that determines whether a road surface of travel is a bad road. The bad road determination device determines whether the road surface of travel is a bad road using a bad road determination threshold value, and a value that relates to wheel behavior that is calculated based at least upon the wheel speed. The bad road determination threshold value is modified according to the wheel slippage amount. The present invention can appropriately set a bad road determination threshold value that is in accordance with a slippage amount, which corresponds to braking power, and can improve bad road determination precision without depending on variation in change of wheel speed.

A drag braking system and method for a model vehicle are provided. The drag braking system may include a transmitter comprising a throttle input and a motor control device. The motor control device may include a user activated operation set selector and a memory storing at least two braking profiles. A first or second braking profile is selected via operation of the operation set selector and a braking force is applied by a motor of the model vehicle according to the braking profile selected. The method may include activating a user activated operation set selector and selecting a program setup mode or a profile selection mode. The method may further include setting a neutral position for a throttle input and selecting a braking profile. Wherein the braking profile applies a braking force via a model vehicle motor when the throttle input is in the neutral position.

A vehicle speed control system for a vehicle having a plurality of wheels, the vehicle speed control system comprising one or more electronic control units configured to carry out a method that includes applying torque to at least one of the plurality of wheels, detecting a slip event between any one or more of the wheels and the ground over which the vehicle is travelling when the vehicle is in motion and providing a slip detection output signal in the event thereof. The method carried out by the one or more electronic control units further includes receiving a user input of a target speed at which the vehicle is intended to travel and maintaining the vehicle at the target speed independently of the slip detection output signal by adjusting the amount of torque applied to the at least one of the plurality of wheels.

A brake control system has an electronic control unit such that, when the motor vehicle is at a standstill, an automatic parking brake function can be activated by the control unit. In the presence of an activation condition for the parking brake function, the brake pressure required for this purpose can be determined at least in a manner dependent on the longitudinal inclination and in a manner dependent on an estimated normal force distribution of all of the wheels and/or an estimated capability of all of the wheels to transmit braking and/or drive torque to the underlying surface. Here, the brake pressure can be predefined to be higher the more wheels have a reduced normal force.

A method for operating a speed control system of a vehicle is provided. The method comprises detecting an occurrence of a slip event, of a step encounter event, or of both events at a leading wheel of the vehicle. The method also comprises predicting that the occurrence of the detected event(s) will occur at a following wheel of the vehicle. The method yet further comprises automatically controlling vehicle speed, vehicle acceleration, or both vehicle speed and acceleration in response to the detection, the prediction, or both the detection and prediction. A speed control system comprising an electronic control unit (ECU) configured to perform the above-described methodology is also provided.

A method of controlling the brake system of a vehicle. The method includes receiving one or more electrical signals each indicative of a value of a respective vehicle-related parameter. The method further includes detecting that the vehicle is traveling across a slope based on the value(s) of one or more of the vehicle-related parameters. The method still further includes automatically modifying the amount of brake torque being applied to at least certain of the wheels of the vehicle in response to the detection of the vehicle traveling across a slope by increasing the amount of brake torque being applied to one or more wheels on one side of the vehicle, and decreasing the amount of brake torque being applied to one or more wheels on the other side of the vehicle.

A method of controlling the braking of a vehicle descending a slope. The method includes receiving one or more electrical signals each indicative of a value of a respective vehicle-related parameter. The method further includes detecting that the vehicle is descending a slope based on the value(s) of one or more of the vehicle-related parameters. The method still further includes automatically modifying an amount of brake torque being applied to at least certain of the wheels of the vehicle in response to the detection of the vehicle descending a slope by increasing the amount of brake torque being applied to one or more trailing wheels of the vehicle, and decreasing the amount of brake torque being applied to one or more leading wheels of the vehicle.

A method for operating an off-road speed control system of a vehicle is provided. The method comprises identifying a pattern or change in at least one component of vehicle drag. The method further comprises monitoring vehicle speed to predict where a change in the at least one component of vehicle drag may result in a speed overshoot event or a speed undershoot event. The method still further comprises, in response to the predicted speed overshoot event or speed undershoot event, automatically commanding the application of an appropriate opposing torque to one or more wheels of the vehicle to counteract the predicted speed overshoot or undershoot. An off-road speed control system for a vehicle comprising an electronic control unit (ECU) configured to perform the above-described methodology is also provided.

Terrain assist apparatus and related methods for use with vehicles are disclosed. An example apparatus includes a vehicle controller configured to determine, based on vehicle sensor data, a condition of a vehicle associated with driving on sand. The vehicle controller is also to generate, via an output device, information instructing a vehicle occupant to configure a driving mode of the vehicle that is associated with controlling vehicle speed. The vehicle controller is also to control a parameter of the vehicle based on a setting of the driving mode to resolve the condition.

An all terrain vehicle may include a frame and a plurality of ground-engaging members supporting the frame. Each of the plurality of ground-engaging members may be configured to rotate about an axle. The all terrain vehicle may further include a powertrain assembly supported by the frame and a braking system (e.g., an anti-lock braking system (ABS)) including a hydraulic and electric controller unit (HECU) operably coupled to the plurality of ground-engaging members and configured to generate yaw to reduce a turning radius of the all terrain vehicle. The HECU may be configured to control brake pressure to the plurality of ground-engaging members independent of a driver input indicating a braking event.