An autonomous traveling vehicle, equipped with autonomous traveling function on a standard machine, has a high-pressure selector valve placed on a flow path in which pressure-oil is supplied from a standard brake valve (SBV) installed in the standard machine to a hydraulic brake. A flow path is installed to connect the high-pressure selector valve and an autonomous brake control valve (ABCV) that is supplied with pressure-oil delivered by a hydraulic pump. Further, an autonomous traveling controller is installed to perform control for autonomous travel, and an autonomous brake controller is installed to perform open or close control on the ABCV in response to a braking instruction from the autonomous traveling controller. When the brake pedal is stepped on, the pressure-oil flows from the SBV to the hydraulic brake, and when the autonomous traveling controller outputs a stop instruction, the pressure-oil flows from the ABCV to the hydraulic brake.

Provided is a hydraulic control apparatus and a brake system capable of improving responsiveness in terms of increasing a pressure in a wheel cylinder. The hydraulic control apparatus includes a connection fluid passage connected to a wheel cylinder of a wheel, a first hydraulic source, and a second hydraulic source. The first hydraulic source includes a first discharge port connected to the connection fluid passage and a first intake port connected to a reservoir storing brake fluid therein. The second hydraulic source includes a second discharge port connected to the connection fluid passage and a second intake port connected to the reservoir.

Provided is a hydraulic control apparatus and a brake system capable of improving responsiveness in terms of increasing a pressure in a wheel cylinder. The hydraulic control apparatus includes a connection fluid passage connected to a wheel cylinder of a wheel, a first hydraulic source, and a second hydraulic source. The first hydraulic source includes a first discharge port connected to the connection fluid passage and a first intake port connected to a reservoir storing brake fluid therein. The second hydraulic source includes a second discharge port connected to the connection fluid passage and a second intake port connected to the reservoir.

There is provided a hydraulic control device that improves the reliability. The hydraulic control device includes a rear-side connection fluid path, a front-side connection fluid path, a first discharge fluid path, a first hydraulic source, a second discharge fluid path, a second hydraulic source, and a shutoff valve. The rear-side connection fluid path connects a master cylinder with a rear-side wheel cylinder. The front-side connection fluid path connects the master cylinder with a front-side wheel cylinder. The first discharge fluid path is connected to the rear-side connection fluid path and to the front-side connection fluid path. The first hydraulic source is configured to discharge a brake fluid to the first discharge fluid path. The second discharge fluid path is connected to the front-side connection fluid path at a position between a connecting position of the first discharge fluid path and the front-side wheel cylinder. The second hydraulic source is configured to discharge the brake fluid to the second discharge fluid path. The shutoff valve is placed between the connecting position of the first discharge fluid path and a connecting position of the second discharge fluid path in the front-side connection fluid path.

There is provided a hydraulic control device that improves the reliability. The hydraulic control device includes a rear-side connection fluid path, a front-side connection fluid path, a first discharge fluid path, a first hydraulic source, a second discharge fluid path, a second hydraulic source, and a shutoff valve. The rear-side connection fluid path connects a master cylinder with a rear-side wheel cylinder. The front-side connection fluid path connects the master cylinder with a front-side wheel cylinder. The first discharge fluid path is connected to the rear-side connection fluid path and to the front-side connection fluid path. The first hydraulic source is configured to discharge a brake fluid to the first discharge fluid path. The second discharge fluid path is connected to the front-side connection fluid path at a position between a connecting position of the first discharge fluid path and the front-side wheel cylinder. The second hydraulic source is configured to discharge the brake fluid to the second discharge fluid path. The shutoff valve is placed between the connecting position of the first discharge fluid path and a connecting position of the second discharge fluid path in the front-side connection fluid path.

An agricultural machine such as a high clearance sprayer is provided with a hydraulic warm-up system for warming multiple hydraulic circuits. The sprayer includes a parking brake system, a hydraulic system including a parking brake hydraulic circuit and at least one ancillary hydraulic circuit, and a hydraulic warm-up system. The warm-up system includes a warm-up circuit defined by the parking brake hydraulic circuit and the at least one ancillary hydraulic circuit so that oil flows through the parking brake hydraulic circuit into the at least one ancillary hydraulic circuit. As a result of this oil flow, the at least one ancillary hydraulic circuit is warmed to improve functionality of the ancillary hydraulic circuit. Where the parking brake is activated and the sprayer is stationary, oil may be diverted to the ancillary hydraulic circuit.

An agricultural machine such as a high clearance sprayer is provided with a hydraulic warm-up system for warming multiple hydraulic circuits. The sprayer includes a parking brake system, a hydraulic system including a parking brake hydraulic circuit and at least one ancillary hydraulic circuit, and a hydraulic warm-up system. The warm-up system includes a warm-up circuit defined by the parking brake hydraulic circuit and the at least one ancillary hydraulic circuit so that oil flows through the parking brake hydraulic circuit into the at least one ancillary hydraulic circuit. As a result of this oil flow, the at least one ancillary hydraulic circuit is warmed to improve functionality of the ancillary hydraulic circuit. Where the parking brake is activated and the sprayer is stationary, oil may be diverted to the ancillary hydraulic circuit.

Method and apparatus are disclosed for adjustment of maximum brake pump speed based on rate of change of target deceleration. An example vehicle includes a brake pump having a maximum pump speed. The example vehicle also includes a vehicle decelerator to determine a target deceleration for autonomous deceleration and send a signal to the brake pump to decelerate the vehicle at the target deceleration. The example vehicle also includes a maximum speed regulator to determine a rate of change of the target deceleration and adjust the maximum pump speed based on the rate of change.

Method and apparatus are disclosed for adjustment of maximum brake pump speed based on rate of change of target deceleration. An example vehicle includes a brake pump having a maximum pump speed. The example vehicle also includes a vehicle decelerator to determine a target deceleration for autonomous deceleration and send a signal to the brake pump to decelerate the vehicle at the target deceleration. The example vehicle also includes a maximum speed regulator to determine a rate of change of the target deceleration and adjust the maximum pump speed based on the rate of change.

A brake system for a vehicle may include a brake input device configured to apply a brake input of a driver; a brake actuator including a first pump device and a second pump device for supplying a brake hydraulic pressure; a brake adjusting device, which includes a first chamber and a second chamber, and is operated so that the first chamber and the second chamber are connected to or blocked from each other; and wheel cylinders configured to generate brake power for each wheel by the brake hydraulic pressure generated in the brake actuator, wherein the brake adjusting device blocks the first chamber and the second chamber so that a brake hydraulic pressure supplied from the first pump device and a brake hydraulic pressure supplied from the second pump device are blocked from each other.