Ground vehicle air data systems, and associated methods are disclosed herein. In one embodiment, a method for determining a drag coefficient of a vehicle includes the steps of: while the vehicle is at rest, opening a valve that connects an air tank with an outside atmosphere; while the vehicle is at rest, closing the valve that connects the air tank with the outside atmosphere; and while the vehicle is in motion, measuring a total pressure with a total pressure probe carried by the vehicle.

Provided is a brake apparatus capable of securing a braking force on a vehicle even at the time of a fluid leak. The brake apparatus performs control so as to continue generation of a brake hydraulic pressure to be supplied to a wheel cylinder with use of a second hydraulic source if a fluid leak of brake fluid is determined based on a preset relationship between a hydraulic pressure of a first hydraulic source and a stroke of a brake pedal.

A hydraulic brake system of a motor vehicle includes a linear actuator as a driver-independent pressure provision device and a hydraulic valve arrangement between the linear actuator and wheel brakes. In the case of a reduced availability of the linear actuator, a holding mode is carried out, in which the hydraulic pressure in the wheel brakes is shut in with the valve arrangement and a power output of the linear actuator is reduced, the system pressure gradient in the holding mode is measured, and a transition from the holding mode into an alternative mode is carried out based on the system pressure gradient.

Systems and methods for a vent interlock system to ensure vent cover closure prior to operation of a transportation vehicle. An embodiment of a system may include an interlock bar. The interlock bar may, in a lowered position, prevent a hydraulic valve handle of a hydraulic pump assembly from moving from an open position to a closed position, the hydraulic valve handle in the closed position to allow a vent cover of the trailer to be opened. The system may include a plunger valve connected to brakes of the transportation vehicle to lock the brakes of the transportation vehicle to prevent operation of the transportation vehicle when the interlock bar is raised. The system may include a spring operated latch attached to the transportation vehicle to hold the interlock bar in the lowered position via a notch or aperture in the interlock bar.

Systems and methods for a vent interlock system to ensure vent cover closure prior to operation of a transportation vehicle. An embodiment of a system may include an interlock bar. The interlock bar may, in a lowered position, prevent a hydraulic valve handle of a hydraulic pump assembly from moving from an open position to a closed position, the hydraulic valve handle in the closed position to allow a vent cover of the trailer to be opened. The system may include a plunger valve connected to brakes of the transportation vehicle to lock the brakes of the transportation vehicle to prevent operation of the transportation vehicle when the interlock bar is raised. The system may include a spring operated latch attached to the transportation vehicle to hold the interlock bar in the lowered position via a notch or aperture in the interlock bar.

Disclosed are a brake pedal assembly, a braking apparatus, and a control method, where the brake pedal assembly includes a pedal, a stroke sensor configured to detect a depression stroke of the pedal, Hall sensors spaced apart from each other in a direction parallel to an operation direction of the pedal, and a controller configured to determine the depression stroke of the pedal using any one or any combination of the stroke sensor and the Hall sensors and to determine a required braking force of a vehicle, in response to the depression stroke of the pedal.

A method for operating an electric parking brake includes determining a fault relating to a first control unit which in a normal operating mode operates the electric parking brake. The method further includes operating a second control unit in an emergency operating mode as a function of the determined fault and determining a state for an operator control element of the parking brake using the second control unit and operating the parking brake as a first function of the determined state of the operator control element using the second control unit in the emergency operating mode.

A method for operating an electric parking brake includes determining a fault relating to a first control unit which in a normal operating mode operates the electric parking brake. The method further includes operating a second control unit in an emergency operating mode as a function of the determined fault and determining a state for an operator control element of the parking brake using the second control unit and operating the parking brake as a first function of the determined state of the operator control element using the second control unit in the emergency operating mode.

A vehicle includes a plurality of brake assemblies and a plurality of electronic brake system (EBS) controllers. The brake assemblies each include an electro-mechanical actuator configured to adjust a torque force applied to a wheel of the vehicle. The EBS controllers are located remotely from one another. Each EBS controller has integrated therein an electronic actuator driver unit that includes an electronic power circuit configured to drive at least one of the electro-mechanical actuators. A first EBS controller is configured to drive a first group of electro-mechanical actuators, and a second EBS controller is configured to drive a second group of electro-mechanical actuators that exclude the electro-mechanical actuators of the first group.

A vehicle includes a plurality of brake assemblies and a plurality of electronic brake system (EBS) controllers. The brake assemblies each include an electro-mechanical actuator configured to adjust a torque force applied to a wheel of the vehicle. The EBS controllers are located remotely from one another. Each EBS controller has integrated therein an electronic actuator driver unit that includes an electronic power circuit configured to drive at least one of the electro-mechanical actuators. A first EBS controller is configured to drive a first group of electro-mechanical actuators, and a second EBS controller is configured to drive a second group of electro-mechanical actuators that exclude the electro-mechanical actuators of the first group.