An electric automobile braking device includes a master cylinder that has no vacuum booster and a hydraulic booster device that can increase a brake fluid pressure generated by the master cylinder. Switching is possible between a normal braking mode in which hydraulic braking and regenerative braking are used in combination when a percentage charge of a battery is less than a threshold value and a regenerative braking restriction mode in which hydraulic braking is permitted and regenerative braking is restricted when the percentage charge is a threshold value or greater. In the regenerative braking restriction mode, when a depressing force of a brake pedal by a driver exceeds a first depressing force over a predetermined period of time, an operation of the hydraulic booster device is suppressed.

Example hydraulic brake actuators and related methods are disclosed herein. An example hydraulic brake actuator includes a rotary valve disposed in a bore of a housing. The rotary valve includes a shaft rotatably disposed within a sleeve. The sleeve and the shaft have ports that align at certain rotational positions to create a flow path between the bore and an inner chamber of the shaft. The example hydraulic brake actuator also includes a pump coupled to the shaft to increase and decrease a pressure within the inner chamber of the shaft.

Example hydraulic brake actuators and related methods are disclosed herein. An example hydraulic brake actuator includes a rotary valve disposed in a bore of a housing. The rotary valve includes a shaft rotatably disposed within a sleeve. The sleeve and the shaft have ports that align at certain rotational positions to create a flow path between the bore and an inner chamber of the shaft. The example hydraulic brake actuator also includes a pump coupled to the shaft to increase and decrease a pressure within the inner chamber of the shaft.

A Brake-By-Wire (BBW) system for a vehicle includes a brake rotor, a caliper, a master cylinder, and a controller. The caliper is adapted to exert a hydraulic force upon the brake rotor during a braking action. The master cylinder includes a housing, a piston, an actuator, and a hydraulic fluid reservoir. The housing defines a piston cavity. The actuator is adapted to controllably move the piston within the piston cavity. A compensation opening is defined by the housing, and is in fluid communication between the reservoir and the piston cavity. A fluid opening is defined by the housing, and is in fluid communication between the caliper and the piston cavity. The controller is configured to receive a vehicle condition signal and send a command signal to the actuator that effects closure of the compensation opening based on the vehicle condition signal to prevent hydraulic fluid flowback to the hydraulic fluid reservoir.

A Brake-By-Wire (BBW) system for a vehicle includes a brake rotor, a caliper, a master cylinder, and a controller. The caliper is adapted to exert a hydraulic force upon the brake rotor during a braking action. The master cylinder includes a housing, a piston, an actuator, and a hydraulic fluid reservoir. The housing defines a piston cavity. The actuator is adapted to controllably move the piston within the piston cavity. A compensation opening is defined by the housing, and is in fluid communication between the reservoir and the piston cavity. A fluid opening is defined by the housing, and is in fluid communication between the caliper and the piston cavity. The controller is configured to receive a vehicle condition signal and send a command signal to the actuator that effects closure of the compensation opening based on the vehicle condition signal to prevent hydraulic fluid flowback to the hydraulic fluid reservoir.

A system is provided having a normal operational mode and a modulated operational mode. The system includes an input device configured to generate a command signal. The system further includes a brake controller configured to generate a brake actuation signal in response to the command signal. The system further includes a fluid source configured to provide fluid in response to the brake actuation signal. The fluid has a first portion and a second portion. The system further includes a return valve in fluid communication with the fluid source, and configured to return the first portion of the fluid to the fluid source when the system is in the modulated operational mode. The system further includes a wheel brake in fluid communication with the fluid source and configured to engage a wheel of the aircraft in response to at least the second portion of the fluid.

A system is provided having a normal operational mode and a modulated operational mode. The system includes an input device configured to generate a command signal. The system further includes a brake controller configured to generate a brake actuation signal in response to the command signal. The system further includes a fluid source configured to provide fluid in response to the brake actuation signal. The fluid has a first portion and a second portion. The system further includes a return valve in fluid communication with the fluid source, and configured to return the first portion of the fluid to the fluid source when the system is in the modulated operational mode. The system further includes a wheel brake in fluid communication with the fluid source and configured to engage a wheel of the aircraft in response to at least the second portion of the fluid.

A vehicle control apparatus is a vehicle control apparatus controlling a vehicle and provided with a regenerative device generating electric power while applying a regenerative braking force by performing regenerative electric power generation, an electric power supply capable of exchanging electric power with the regenerative device, and a hydraulic device applying a hydraulic braking force attributable to a hydraulic pressure, and is provided with an electronic control device controlling the regenerative device and the hydraulic device so as to adjust the ratios of the regenerative braking force and the hydraulic braking force to a required braking force required for the braking of the vehicle based on an input electric power value input into the electric power supply.

A vehicle control apparatus is a vehicle control apparatus controlling a vehicle and provided with a regenerative device generating electric power while applying a regenerative braking force by performing regenerative electric power generation, an electric power supply capable of exchanging electric power with the regenerative device, and a hydraulic device applying a hydraulic braking force attributable to a hydraulic pressure, and is provided with an electronic control device controlling the regenerative device and the hydraulic device so as to adjust the ratios of the regenerative braking force and the hydraulic braking force to a required braking force required for the braking of the vehicle based on an input electric power value input into the electric power supply.

A service brake device for vehicles is provided which permits rapid venting of a service brake pressure chamber. The service brake device includes at least one pneumatic service brake device with at least one piston and/or a diaphragm. The piston and/or diaphragm delimits the service brake pressure chamber on one side which can be supplied with compressed air from a brake line for applying the service brake and can be purged of compressed air for releasing the service brake, delimits a spring chamber on the other side which receives a spring that prestresses the piston and/or the diaphragm in the release position of the service brake. The pressure chamber includes a pressure connection communicating with the brake line. A quick air release valve between the brake line and the pressure chamber is arranged to connect the brake line to the pressure chamber when the pressure in the brake chamber is greater than in the pressure chamber, and to connect the pressure chamber to the spring chamber when the pressure in the pressure chamber is greater than the brake line pressure.