A method for determining a position of a hydraulic pump includes determining the position and/or change of position of the hydraulic pump based on a current and/or voltage measurement signal as well as a frequency of the measurement signal. The method also includes utilizing the determined position and/or changing of position of the hydraulic pump for actuating the electrical machine.

A method for determining a position of a hydraulic pump includes determining the position and/or change of position of the hydraulic pump based on a current and/or voltage measurement signal as well as a frequency of the measurement signal. The method also includes utilizing the determined position and/or changing of position of the hydraulic pump for actuating the electrical machine.

A transportation vehicle with a brake system designed for rapid deceleration of a moving vehicle, which enhances the effectiveness of vehicular braking in emergency situations, and increases the safety of automobile traffic on roads, which results in greater road-traffic safety due to enhanced reliability and higher effectiveness of braking under emergency situations.

A vehicular hydraulic brake system having a master brake cylinder with a hydraulic reservoir supplying a brake fluid, a control foot pedal and a vacuum booster connected to an operating brake cylinder of each wheel. The brake system has emergency braking assemblies mounted before the operating brake cylinders of at least rear wheels. The emergency braking assembly includes an electric mechanism operating in a reciprocating manner and has a rod attached to a piston of a hydraulic cylinder. An inlet hole of the hydraulic cylinder is connected to a pipeline in communication with the master braking cylinder. An outlet hole of the hydraulic cylinder is in communication with the operating brake cylinder. A top portion of the hydraulic cylinder has a compensation port in the close proximity to the electric mechanism, said compensation port being connected to the pipeline in communication with the master braking cylinder. A bottom portion of the hydraulic cylinder of the emergency braking assembly is disposed not lower than a top level of the operating brake cylinder.

The invention provides a vehicle brake system including a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system includes a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly.

The invention provides a vehicle brake system including a brake assembly providing a service brake and a parking brake having a brake disc assembly in common, a service brake circuit, a parking brake circuit, and a brake control arrangement adapted to control the service brake by selectively providing a fluid communication between a pressurising arrangement and the service brake via the service brake circuit, the brake control arrangement further being adapted to control the parking brake by selectively providing a fluid communication between the pressurising arrangement and the parking brake via the parking brake circuit, and by selectively draining the parking brake circuit, wherein the vehicle brake system includes a draining circuit adapted to drain the service brake circuit to avoid overload of the brake disc assembly.

Check valves are disclosed and include a housing defining an internal cavity having a first seat and a second seat, and a seal member within the internal cavity translatable between a closed position against the first seat and an open position against the second seat. The second seat has a middle axis transverse to a plane of a longitudinal cross-section of the housing and has a shortest finger positioned to either the left or to the right of the middle axis. The seal member is seatable against the second seat at an angle or in a deflected position against the plurality of fingers, thereby defining a longer distance of travel to reach the closed position for a portion of the check valve disc that is associated with the position of the shortest finger relative to other portions of the check valve disc.

Check valves are disclosed and include a housing defining an internal cavity having a first seat and a second seat, and a seal member within the internal cavity translatable between a closed position against the first seat and an open position against the second seat. The second seat has a middle axis transverse to a plane of a longitudinal cross-section of the housing and has a shortest finger positioned to either the left or to the right of the middle axis. The seal member is seatable against the second seat at an angle or in a deflected position against the plurality of fingers, thereby defining a longer distance of travel to reach the closed position for a portion of the check valve disc that is associated with the position of the shortest finger relative to other portions of the check valve disc.

System for suctioning braking particles from a friction braking system, the suction system including a negative-pressure source, a suction mouth, a pneumatic circuit connecting the suction mouth and the negative-pressure source, and a control unit, the suction system further including a closure unit arranged on the pneumatic circuit, the closure unit being able to isolate at least a first portion of the pneumatic circuit, the control unit being configured to control the closure means according to a predetermined logic in order to isolate the first portion of the pneumatic circuit during certain phases between two actual uses of the negative-pressure source.

Assembly in a compressed air system of a vehicle provided with an air ride suspension, the assembly being configured to lift the vehicle body by filling at least one air spring, the solenoid valves being switchable in cooperation with an electronic control device, and the assembly including a pressure line for filling the air springs, and the pressure line including a first branch line connectable to the pressure line via a pilot-controlled solenoid valve for filling the air springs and including first supply pipes and pilot-controlled solenoid valves for each air spring as well as a second branch line for providing a control pressure which includes second supply pipes for the pilot-controlled solenoid valves, wherein the second branch line is connected to the pressure line via a check valve, the check valve providing a block position against venting or pressure drop in the second branch line.

Disclosed is an acoustic attenuation device for an electromechanical device through which a gas stream passes which is capable of propagating acoustic waves. The device includes inlet ports and outlet ports for a gas stream, in particular for the purpose of releasing the gas stream into the atmosphere. The device includes a generally annular channel defining a substantially circular flow path for the gas stream about a main axis between the inlet and outlet ports, and a plurality of acoustic attenuator elements which are tuned to an attenuation resonance frequency with an associated attenuation frequency band and are distributed in series circularly along the channel so as to interact with the gas stream flowing in the channel, the acoustic attenuator elements being formed by cavities of quarter-wave resonators.