A brake negative pressure control device for a vehicle includes an ECU. The ECU is configured to (i) control a first fuel injection valve and a second fuel injection valve, when the ECU determines that a negative pressure in a negative pressure chamber is insufficient, such that a ratio of a fuel injection amount by the first fuel injection valve is decreased and a ratio of a fuel injection amount by the second fuel injection valve is increased; and (ii) control an opening degree of the throttle valve, when the ECU determines that the negative pressure in the negative pressure chamber is insufficient, such that the opening degree of the throttle valve at the time when the ECU determines that the negative pressure is insufficient is smaller than an opening degree of the throttle valve at the time when the ECU determines that the negative pressure is not insufficient.

An engine system including a first flowpath between a first component and a second component where a first aspirator forms a portion of the first flowpath, and a second flowpath between the first component and the second component, where a second aspirator forms a portion of the second flowpath. A shut-off valve forms a portion of the second flowpath. The first aspirator and the second aspirator each have a suction inlet, and the suction inlet of the first aspirator is in fluid communication with the suction inlet of the second aspirator.

An engine system including a first flowpath between a first component and a second component where a first aspirator forms a portion of the first flowpath, and a second flowpath between the first component and the second component, where a second aspirator forms a portion of the second flowpath. A shut-off valve forms a portion of the second flowpath. The first aspirator and the second aspirator each have a suction inlet, and the suction inlet of the first aspirator is in fluid communication with the suction inlet of the second aspirator.

Methods and systems are provided for detecting a fault within a brake booster system of a vehicle. In one example, a method may include measuring the pressure of a brake booster chamber and the pressure of an inlet manifold, comparing the booster chamber and inlet manifold pressures, determining the faulty source, and restricting the use of an electrical system in case of a fault. In this way, the pressure within the inlet manifold may be reduced or maintained in the event of a fault.

Methods and systems are provided for detecting a fault within a brake booster system of a vehicle. In one example, a method may include measuring the pressure of a brake booster chamber and the pressure of an inlet manifold, comparing the booster chamber and inlet manifold pressures, determining the faulty source, and restricting the use of an electrical system in case of a fault. In this way, the pressure within the inlet manifold may be reduced or maintained in the event of a fault.

A compressed air supply installation for operation of an air spring installation of a vehicle includes an air feed with an air compressor configured to supply a compressed air feed with compressed air, a pneumatic main line with an air dryer and a compressed air connection for supplying the pneumatic installation with compressed air, a purge line branching from the pneumatic main line to the compressed air feed and comprising a purge valve connected in the purge line and a purge connection for releasing air to the environment, wherein the purge valve is part of a controllable valve assembly. The controllable valve assembly with the purge valve can be pneumatically loaded with a control pressure derived from the air compressor.

A drive train arrangement includes an internal combustion engine with at least one cylinder having a combustion gas inlet, and an exhaust outlet; an exhaust gas pump having a pump inlet coupled to the exhaust outlet, and a pump outlet coupled to a vehicle air tank and to the combustion gas inlet. A first flow control arrangement controls fluid flow from the pump outlet to the combustion gas inlet, and to the vehicle air tank. Control circuitry controls operation of the first flow control arrangement. The control circuitry is configured to: acquire a first indication of an air pressure in the vehicle air tank; and control, in response to the air pressure in the vehicle air tank being below a first threshold, the first flow control arrangement to allow fluid flow from the pump outlet to the vehicle air tank.

A drive train arrangement includes an internal combustion engine with at least one cylinder having a combustion gas inlet, and an exhaust outlet; an exhaust gas pump having a pump inlet coupled to the exhaust outlet, and a pump outlet coupled to a vehicle air tank and to the combustion gas inlet. A first flow control arrangement controls fluid flow from the pump outlet to the combustion gas inlet, and to the vehicle air tank. Control circuitry controls operation of the first flow control arrangement. The control circuitry is configured to: acquire a first indication of an air pressure in the vehicle air tank; and control, in response to the air pressure in the vehicle air tank being below a first threshold, the first flow control arrangement to allow fluid flow from the pump outlet to the vehicle air tank.

The present application relates to a brake actuating unit for a brake-by-wire motor vehicle brake system. The brake actuating unit comprises a housing, a first electrically controllable pressure supplying device, and a second electrically controllable pressure supplying device. The brake actuating unit further comprises a first connector for electrically connecting the brake actuating unit with a vehicle control unit and with a power network. The first connector is electrically connected with the first electrically controllable pressure supplying device. The brake actuating unit comprises a second connector for electrically connecting the brake actuating unit with the vehicle control unit and with the power network. The second connector is electrically connected with the second electrically controllable pressure supplying device. The brake actuating unit comprises a first cylinder and piston arrangement disposed within the housing and a piston rod for transmitting a displacement of a brake pedal to a piston.

The present application relates to a brake actuating unit for a brake-by-wire motor vehicle brake system. The brake actuating unit comprises a housing, a first electrically controllable pressure supplying device, and a second electrically controllable pressure supplying device. The brake actuating unit further comprises a first connector for electrically connecting the brake actuating unit with a vehicle control unit and with a power network. The first connector is electrically connected with the first electrically controllable pressure supplying device. The brake actuating unit comprises a second connector for electrically connecting the brake actuating unit with the vehicle control unit and with the power network. The second connector is electrically connected with the second electrically controllable pressure supplying device. The brake actuating unit comprises a first cylinder and piston arrangement disposed within the housing and a piston rod for transmitting a displacement of a brake pedal to a piston.