Methods and systems are provided for controlling an aspirator shut-off valve in an engine of a hybrid vehicle. One example method includes opening the aspirator shut-off valve following a shut-down command to the engine when engine speed is between a first engine speed and a second engine speed, the first engine speed being lower than an idle speed and the second engine speed occurring before an imminent engine stop. The example method further includes not opening the aspirator shut-off valve between the first engine speed and the second engine speed if an oxygen content of an emission control device is at or near a threshold.

A compressed air supply installation for the operation of a pneumatic system includes a compressed air feed, a compressed air connection to a pneumatic unit, a venting connection, a main pneumatic line disposed between the compressed air feed and the compressed air connection, and a first venting line disposed between the compressed air connection and the venting connection, the first venting line including a venting valve including a first venting valve connection, a second venting valve connection, and a control connection pneumatically connected to a control valve by a pneumatic control relay line. The venting valve is closed between the first venting valve connection and the second venting valve connection to the venting connection in a first switching state of the venting valve and is opened between the first venting valve connection and the second venting valve connection to the venting connection in a second switching state.

An exemplary brake booster device includes, among other things, a brake booster mounted on a vehicle component, and an actuator that, in response to a force applied to the actuator by a gearbox housing, pivots to move the brake booster upward. The actuator includes at least two pivot elements spaced from each other, and a displacement mounted in a jointed manner between the at least two pivot elements.

A brake booster is mounted on a forward bulkhead of a motor vehicle having two elements, a first element being securely connected to the brake booster whilst a second element is securely connected to the bulkhead. The two elements are restrained against vertical movement relative to one another by at least one connector which is deformed or fails upon a movement of the brake booster upward relative to the bulkhead. An actuator is movably mounted to the bulkhead below the brake booster and rearward of a gearbox housing such that rearward movement of the gearbox housing during a frontal collision presses against the actuator and moves the actuator upward to apply pressure to the brake booster, the pressure causing the brake booster to move upward relative to the bulkhead.

A compressed air system for a motor vehicle with an air supply system, including: an electric drive motor, which can be controlled for variable speed, an air compressor coupled to be driven by the electric drive motor, an electric power supply for supplying electric power to the electric drive motor, at least one air reservoir connected with the air compressor to receive air from the air compressor, an air utilization system connected to the at least one air reservoir to receive air from the at least one air reservoir, a controller to control the speed of the electric drive motor. The controller controls the electric drive motor to determine the speed of the electric drive motor so that during filling of the air reservoir, when the pressure level in the air reservoir passes a setpoint that is between a minimum level and a higher cut off pressure level, the controller changes the compressor speed so that specific power consumption per unit mass of air compressed is decreased.

A compressed air system for a motor vehicle with an air supply system, including: an electric drive motor, which can be controlled for variable speed, an air compressor coupled to be driven by the electric drive motor, an electric power supply for supplying electric power to the electric drive motor, at least one air reservoir connected with the air compressor to receive air from the air compressor, an air utilization system connected to the at least one air reservoir to receive air from the at least one air reservoir, a controller to control the speed of the electric drive motor. The controller controls the electric drive motor to determine the speed of the electric drive motor so that during filling of the air reservoir, when the pressure level in the air reservoir passes a setpoint that is between a minimum level and a higher cut off pressure level, the controller changes the compressor speed so that specific power consumption per unit mass of air compressed is decreased.

Method and system for determining a pressure/volume characteristic curve of a wheel brake in a motor vehicle brake system having an electrically controllable pressure supply device connected hydraulically to wheel brakes and can output a pressure medium volume for activating the wheel brakes. The pressure medium volume which is output by the pressure supply device can be determined. An electrically actuable inlet valve per wheel brake disconnects the connection between the wheel brake and the pressure supply device. During one or more service brake operations of the motor vehicle wheel brakes are activated by the pressure supply device, the pressure medium volume output by the pressure supply device in order to activate the wheel brakes is determined and the pressure/volume characteristic curves of the wheel brakes are determined on the basis of pressure medium volumes output by the pressure supply device during one or more service braking operations are determined.

Method and system for determining a pressure/volume characteristic curve of a wheel brake in a motor vehicle brake system having an electrically controllable pressure supply device connected hydraulically to wheel brakes and can output a pressure medium volume for activating the wheel brakes. The pressure medium volume which is output by the pressure supply device can be determined. An electrically actuable inlet valve per wheel brake disconnects the connection between the wheel brake and the pressure supply device. During one or more service brake operations of the motor vehicle wheel brakes are activated by the pressure supply device, the pressure medium volume output by the pressure supply device in order to activate the wheel brakes is determined and the pressure/volume characteristic curves of the wheel brakes are determined on the basis of pressure medium volumes output by the pressure supply device during one or more service braking operations are determined.

A method for a hybrid-electric vehicle may comprise, while the hybrid-electric vehicle is moving and in an absence of fuel being directed to an engine, directing engine intake air through an ejector to supply vacuum to a brake booster independent of a brake booster vacuum.

A method for a hybrid-electric vehicle may comprise, while the hybrid-electric vehicle is moving and in an absence of fuel being directed to an engine, directing engine intake air through an ejector to supply vacuum to a brake booster independent of a brake booster vacuum.