Abstract: To enable control of vehicle speed according to the intentions of a driver by a simpler operation. When a vehicle body speed rapidly decreases and becomes lower than a brake target threshold speed, the brake target threshold speed is decreased in conformity with the vehicle body speed. This prevents the increase of the vehicle body speed toward the brake target threshold speed such that a vehicle accelerates regardless of a brake being in operation because the brake target threshold speed is set at a higher value than the vehicle body speed. Accordingly, the vehicle body speed decelerates by a simpler operation while being able to prevent the vehicle from accelerating against the intentions of a driver and being able to control the speed of the vehicle according to the intentions of the driver.

Abstract: This brake ECU executes vehicle downhill control for adjusting the braking force to be applied to a vehicle by actuating a brake actuator such that the vehicle body speed does not exceed a target speed. Also, in cases where the accelerator pedal is being operated in a state where the vehicle downhill control is being executed, the brake ECU changes the target speed such that, the longer the operation duration which is the duration for which the accelerator is operated, the higher the target speed.

Abstract: A hydraulic braking system includes: a master cylinder including: a pressurizing piston fluid-tightly and slidably fitted in a housing; a front pressure chamber located in front of the pressurizing piston and connected to a brake cylinder; and a rear chamber located behind the pressurizing piston; a rear-hydraulic-pressure control device connected to the rear chamber of the master cylinder and configured to supply control hydraulic pressure to the rear chamber; and an air bleeding device configured to perform air bleeding for an air bleeding target portion as at least a portion of the rear-hydraulic-pressure control device, in a state in which working fluid is prevented from being supplied to the rear chamber.

Abstract: When driving of a motor is on and W/C pressure of a low-pressure-side wheel is increased, the driving of the motor is continued until the actual W/C pressure of a high-pressure-side wheel in the same system reaches a predetermined range relative to a target pressure. Specifically, if the target pressure of the low-pressure-side wheel is greater than a predetermined value, the braking hydraulic pressure of the low-pressure-side wheel is increased, the motor is driven, and to account for a resulting decrease in the W/C pressure of the high-pressure-side wheel, the driving of the motor is continued until the W/C pressure of the high-pressure-side wheel is restored. Temperature increases in the motor can thereby be prevented and durability can be improved by shortening the drive time of the motor as much as possible.

Abstract: A vehicle brake device is provided with: an acquisition unit that acquires travel resistance force produced between a vehicle wheel and a road surface touched by the wheel when, for example, a vehicle having the wheel travels, on the basis of driving force of the vehicle and acceleration of the vehicle; and a control unit that starts a control for supplying braking force to the wheel of the vehicle when a difference between the travel resistance force and a predetermined value exceeds a first threshold value and a differential value of the travel resistance force exceeds a second threshold value.

Abstract: A vehicle control device corrects the amount of brake control according to the degree of stall prevention requests such that the brake control amount is matched to a travel state. For example, when the vehicle body speed is low, the vehicle body is often traveling a road surface that is difficult to travel, and the degree of stall prevention requests is small. In such cases, the vehicle control device exhibits LSD effects and increases ground-covering properties by executing vehicle wheel slip control based on stronger brake control, while increasing safety properties by better enabling generation of deceleration. Then, as the vehicle body speed increases, because it is conceivable that the vehicle body is leaving a place that is difficult to travel and the degree of stall prevention requests is high, the vehicle control device executes switching such that brake control is lowered.

Abstract: To enable control of vehicle speed according to the intentions of a driver by a simpler operation. When a vehicle body speed rapidly decreases and becomes lower than a brake target threshold speed, the brake target threshold speed is decreased in conformity with the vehicle body speed. This prevents the increase of the vehicle body speed toward the brake target threshold speed such that a vehicle accelerates regardless of a brake being in operation because the brake target threshold speed is set at a higher value than the vehicle body speed. Accordingly, the vehicle body speed decelerates by a simpler operation while being able to prevent the vehicle from accelerating against the intentions of a driver and being able to control the speed of the vehicle according to the intentions of the driver.

Abstract: For traction control, different filters, i.e., a hydraulic-pressure-increase filter and a hydraulic-pressure-decrease filter, are provided for increasing and decreasing target pressure, respectively. The inhibiting effect that the hydraulic-pressure-increase filter exhibits with respect to target pressure changes is made less than the inhibiting effect that the hydraulic-pressure-decrease filter exhibits with respect to changes in the target pressure, and so the target pressure is increased quickly but decreased slowly. As such, even if the wheel-cylinder pressure decreases subsequent to the actual wheel-cylinder pressure having increased to follow the target pressure, the wheel-cylinder pressure decreases only gradually, reducing the amount of pressure increase needed to reach the target pressure when the wheel-cylinder pressure is next increased.

Abstract: A hydraulic braking system includes: a master cylinder including: a pressurizing piston fluid-tightly and slidably fitted in a housing; a front pressure chamber located in front of the pressurizing piston and connected to a brake cylinder; and a rear chamber located behind the pressurizing piston; a rear-hydraulic-pressure control device connected to the rear chamber of the master cylinder and configured to supply control hydraulic pressure to the rear chamber; and an air bleeding device configured to perform air bleeding for an air bleeding target portion as at least a portion of the rear-hydraulic-pressure control device, in a state in which working fluid is prevented from being supplied to the rear chamber.

Abstract: When driving of a motor is on and W/C pressure of a low-pressure-side wheel is increased, the driving of the motor is continued until the actual W/C pressure of a high-pressure-side wheel in the same system reaches a predetermined range relative to a target pressure. Specifically, if the target pressure of the low-pressure-side wheel is greater than a predetermined value, the braking hydraulic pressure of the low-pressure-side wheel is increased, the motor is driven, and to account for a resulting decrease in the W/C pressure of the high-pressure-side wheel, the driving of the motor is continued until the W/C pressure of the high-pressure-side wheel is restored. Temperature increases in the motor can thereby be prevented and durability can be improved by shortening the drive time of the motor as much as possible.

Abstract: A road slope determining apparatus for a vehicle includes a slope measuring device that measures a slope of a road on which the vehicle is traveling; a distance measuring device that measures a distance traveled by the vehicle; and a determining apparatus that determines, based on the measured slope and the measured distance traveled, whether the vehicle is traveling on a gradient in which the slope is continuous or on a rough road in which the slope is discontinuous. This road slope determining apparatus is able to appropriately determine whether the road has a slope when the vehicle is traveling at slow speeds such as when running off-road, for example.

Abstract: In a vehicle travel controlling apparatus including an automatic travel controlling ECU that controls a vehicle in a predetermined travel state by cooperation control of a vehicle driving amount and a vehicle braking amount, the automatic travel controlling ECU is provided with an automatic travel termination controlling unit. The automatic travel termination controlling unit obtains a brake fluid pressure during the cooperation control according to the vehicle driving amount during the cooperation control and a gradient of a road surface on which a vehicle is travelling. When the brake fluid pressure corresponding to a braking operation of a driver is more than the brake fluid pressure during the cooperation control, the automatic travel termination controlling unit terminates the cooperation control to switch operation to a braking operation according to the brake fluid pressure corresponding to the braking operation.

Abstract: If a condition for finishing speed limit control is satisfied, a gradient of a slope of the road is estimated based on a steady component of the longitudinal acceleration of the vehicle, and a correction factor is computed based on the slope gradient of the road, while a target acceleration of the vehicle is computed based on the vehicle speed. Then, a target vehicle speed is computed by adding the target vehicle speed of the last cycle to the product of the correction factor, target acceleration and the cycle time of the control, and the braking or driving force of each wheel is controlled so that the vehicle speed becomes equal to the target vehicle speed. In this manner, a passenger of the vehicle is prevented from feeling uncomfortable about the speed increase after the completion of the vehicle speed limit control.

Abstract: A vehicle control device for controlling the driving force and braking force that is applies to a vehicle to maintain a target wheel speed includes: a plurality of determination parts each of which determines the wheel speed of a corresponding one of a plurality of wheels of the vehicle; a calculation part that calculates the wheel speed validity threshold for each wheel based on the determined wheel speeds; a decision part that decides whether the wheel speed validity threshold calculated for each wheel is below a specific threshold speed; a setting part that resets the target wheel speed depending on the result of the decision by the decision part; and an estimation part that estimates the vehicle speed based on the determined wheel speeds.

Abstract: A slip control apparatus includes a driving torque calculating means calculating driving torque, a driving torque applying means applying the calculated driving torque to driving wheels, and a slip restraining means restraining slippage at each driving wheel when the slippage occurs at each driving wheel, wherein when the slippage occurs at each driving wheel, the driving torque calculating means calculates demanded torque and adds consumed driving torque, which corresponds to the driving torque consumed for restraining the slippage at each driving wheel by the slip restraining means, to the calculated demanded torque to calculate the driving torque.

Abstract: A system for controlling a vehicle that controls driving force and braking force such that a vehicle speed is maintained at a target vehicle speed. More specifically, when the vehicle speed exceeds the target vehicle speed, the system for controlling a vehicle maintains the driving force at or above a predetermined value, and applies braking force to the vehicle such that the vehicle speed is maintained at the target vehicle speed. This provides the vehicle with sufficient driving force for uphill driving following the downhill driving, and thus to travel uphill without significant speed loss. In other words, the vehicle ascends the uphill road smoothly at an approximately constant speed.

Abstract: A vehicle control device for controlling the driving force and the braking force that is applied to a vehicle to approach a target wheel speed includes a plurality of determination parts that determine the wheel speed at a corresponding wheel; and a calculation part that calculates a valid wheel speed threshold for each wheel based on determined wheel speeds. The vehicle control device also includes a decision part that decides whether wheel speed is valid depending on whether the valid wheel speed threshold calculated for each wheel is below a specific speed threshold value, which is below the target wheel speed, and an estimation part that estimates the vehicle speed using the wheel speeds that are determined as being valid.

Abstract: A vehicle drive control device includes a wheel speed detecting means for detecting a rotational speed of a plurality of wheels of a vehicle, a vehicle speed calculating means for calculating a vehicle speed on the basis of the rotational speed of the plurality of wheels detected by the wheel speed detecting means, and an automatic drive controlling means for performing an automatic drive control for controlling the vehicle speed to be a predetermined target speed by controlling a driving force generating means and a vehicle speed reducing means for the vehicle. The automatic drive controlling means further performs a driving force reducing control for reducing a driving force of the vehicle to be generated by the driving force generating means when the rotational speed of at least one of the plurality of wheels detected by the wheel speed detecting means exceeds a predetermined value.

Abstract: A vehicle travel control device has a engine that controls an engine based on a driving target controlled variable; a brake that controls a brake device based on a braking target controlled variable; and a automatic travel control that calculates the driving target controlled variable and/or braking target controlled variable so that a vehicle speed of a vehicle becomes a target vehicle speed, and outputs the driving target controlled variable to the engine and the braking target controlled variable to the brake, the vehicle travel control device being configured such that, upon detection of an acceleration operation during the vehicle travel control, the automatic travel control calculates a target vehicle speed for vehicle travel control by the brake device, so that the target vehicle speed becomes higher than a current vehicle speed of the vehicle.

Abstract: A vehicle running control apparatus, which performs automatic running control by controlling an engine for applying a driving torque to a vehicle C and a brake device for applying a braking torque to the vehicle C such that a vehicle speed of the vehicle C becomes equal to a preset target vehicle speed, determines, on the basis of a target driving torque ETo calculated to apply the driving torque to the vehicle C and a target braking torque BTo calculated to apply the braking torque to the vehicle C, whether or not the vehicle C is running on a road difficult to run on, when automatic running control is performed. When it is determined that the vehicle C is running on the road difficult to run on, automatic running control is terminated.