A method allows piloting a braking system of a vehicle, the braking system including at least a pair of coupled brake actuators, that includes a pneumatic actuator supplied with a compressed air tank pressurized by a compressor, and an electric actuator. The method includes steps including a) measuring the air pressure of the air tank, b) if the air pressure measured at step a) is inferior to a first threshold value, assessing whether the compressor is able to build up the air pressure of the air tank, c) if the result of the assessment performed at step b) is that the compressor is unable to build up the air pressure of the air tank, operating the braking system in a degraded mode wherein at least the electric actuator is used in case of braking, and d) if the air pressure measured at step a) is inferior to a second threshold value, that is lower than the first threshold value, and if the compressor is unable to build up the air pressure of the air tank, using only the electric actuator in case of new braking actions.

A method allows piloting a braking system of a vehicle, the braking system including at least a pair of coupled brake actuators, that includes a pneumatic actuator supplied with a compressed air tank pressurized by a compressor, and an electric actuator. The method includes steps including a) measuring the air pressure of the air tank, b) if the air pressure measured at step a) is inferior to a first threshold value, assessing whether the compressor is able to build up the air pressure of the air tank, c) if the result of the assessment performed at step b) is that the compressor is unable to build up the air pressure of the air tank, operating the braking system in a degraded mode wherein at least the electric actuator is used in case of braking, and d) if the air pressure measured at step a) is inferior to a second threshold value, that is lower than the first threshold value, and if the compressor is unable to build up the air pressure of the air tank, using only the electric actuator in case of new braking actions.

A method for operating a hydraulic brake system of a motor vehicle, comprising a pressure generating device used to build up additional brake pressure in a master brake cylinder or in addition to a master brake cylinder and in opposition to further pedal actuation wherein the additional pressure is a function of the pedal actuation travel distance. A method that reduces the limitations of a braking system's physical parameters on the build-up of additional braking pressure.

A method for operating a hydraulic brake system of a motor vehicle, comprising a pressure generating device used to build up additional brake pressure in a master brake cylinder or in addition to a master brake cylinder and in opposition to further pedal actuation wherein the additional pressure is a function of the pedal actuation travel distance. A method that reduces the limitations of a braking system's physical parameters on the build-up of additional braking pressure.

A running control device of a vehicle includes an engine and a brake booster amplifying a brake force by forming a negative pressure in a negative pressure tank by rotation of the engine. The running control device is configured to execute an engine brake running mode performed with the engine coupled to wheels such that an engine brake is applied by driven rotation of the engine and an inertia running mode performed with an engine brake force made lower than that of the engine brake running mode. The running control device executes a first inertia running mode performed with the rotation of the engine stopped and a second inertia running mode performed with the engine kept rotating as the inertia running mode in accordance with predefined respective execution conditions. The running control device comprises a prediction portion configured to predict a necessity of the negative pressure.

A running control device of a vehicle includes an engine and a brake booster amplifying a brake force by forming a negative pressure in a negative pressure tank by rotation of the engine. The running control device is configured to execute an engine brake running mode performed with the engine coupled to wheels such that an engine brake is applied by driven rotation of the engine and an inertia running mode performed with an engine brake force made lower than that of the engine brake running mode. The running control device executes a first inertia running mode performed with the rotation of the engine stopped and a second inertia running mode performed with the engine kept rotating as the inertia running mode in accordance with predefined respective execution conditions. The running control device comprises a prediction portion configured to predict a necessity of the negative pressure.

An aspirator for a brake system is provided having the integrated functions of a flow bypass and a check valve for automotive applications to achieve various suction flow openings in response to different engine operating condition to enhance brake boost performance. The brake system includes a brake vacuum booster, an engine having an intake manifold, an aspirator having a movable total flow divergence nozzle, the aspirator being connected to the manifold, and a vacuum line connecting the booster to the aspirator. The aspirator includes a body having an internal end wall. A biasing element such as a spring is provided between the movable total flow divergence nozzle and the internal end wall of the aspirator body. The body of the aspirator includes an air flow path having an upstream area and a downstream area. The movable motive flow nozzle is positioned in the downstream area of the flow path.

A control device calculates an estimate of negative intake pressure based on the relationship between the rotation speed of a crankshaft and a throttle opening degree (Step S24). Then, the control device sets the estimate PE of the negative intake pressure, which is calculated in Step S24, to a greater value as combustion efficiency of CNG used in engine operation becomes higher (Step S25). When the corrected estimate PE of the negative intake pressure becomes smaller than or equal to a reference value PTh (Step S26: YES), the control device starts a negative pressure recovery procedure (Step S27).

An internal gear pump, in particular a hydraulic pump for a slip-controlled vehicle braking system, is configured to be pre-assembled. The internal gear pump includes a cartridge configured as a casing, which is configured to be inserted in a receptacle in a hydraulic block of a vehicle braking system.

An internal gear pump, in particular a hydraulic pump for a slip-controlled vehicle braking system, is configured to be pre-assembled. The internal gear pump includes a cartridge configured as a casing, which is configured to be inserted in a receptacle in a hydraulic block of a vehicle braking system.