A method for diagnosing a fault situation of a negative-pressure generation line using a fuel tank pressure sensor that detects the pressure of a fuel tank is provided. The method detects pressure in a fuel tank measured by a fuel tank pressure sensor when a turbocharger is operated for boosting and a purge valve is operated and diagnoses a current situation as a fault situation in which an engine negative-pressure generation line remains open when a pressure change value calculated based on the pressure difference of the fuel tank exceeds a reference value. A warning of a fault situation is then output when a fault is determined.

An electronic compressor bypass valve (eCBV) module includes a pedestal housing, and a compressor bypass valve mounted to the pedestal housing. An inlet port, a first outlet port, and a second outlet port are integrally formed as part of the pedestal housing, where pressurized air flows into the inlet port. The eCBV module also includes a venturi device at least partially disposed in the second outlet port. When the compressor bypass valve is in an open position, a portion of the pressurized air flows through the first outlet port, and a portion of the pressurized air flows from the inlet port through the venturi device and through the second outlet port. When the compressor bypass valve is in the closed position the pressurized air is prevented from flowing into the first outlet port, and all of the pressurized air flows through the venturi device and through the second outlet port.

A method of securing brake booster negative pressure is provided. The method includes operating a purge pump that is connected to a canister having evaporation gas absorbed thereon and a brake booster and determining whether the evaporation gas is injected into an intake pipe by the operation of the purge pump. Whether a negative pressure of the brake booster is insufficient is determined and when the evaporation gas is being injected into the intake pipe and the negative pressure is insufficient, a degree of opening of a valve provided in a line connecting the canister and the purge pump is adjusted.

A method for diagnosing a fault situation of a negative-pressure generation line using a fuel tank pressure sensor that detects the pressure of a fuel tank is provided. The method detects pressure in a fuel tank measured by a fuel tank pressure sensor when a turbocharger is operated for boosting and a purge valve is operated and diagnoses a current situation as a fault situation in which an engine negative-pressure generation line remains open when a pressure change value calculated based on the pressure difference of the fuel tank exceeds a reference value. A warning of a fault situation is then output when a fault is determined.

Methods and systems are provided for increasing an efficiency of a purging operation of a fuel vapor storage canister of a vehicle, the fuel vapor storage canister configured to capture and store fuel vapors stemming from a fuel tank of the vehicle. As one example, a method comprises reactivating one or more cylinders of an engine during a purging operation, in response to an indication that the purging of stored fuel vapors from the fuel vapor storage canister is compromised as a result of fuel vaporization stemming from the fuel tank. In this way, the canister may be effectively cleaned even under high fuel vaporization circumstances, which may improve fuel economy and may reduce release of undesired evaporative emissions to atmosphere.

An electronic compressor bypass valve (eCBV) module includes a pedestal housing, and a compressor bypass valve mounted to the pedestal housing. An inlet port, a first outlet port, and a second outlet port are integrally formed as part of the pedestal housing, where pressurized air flows into the inlet port. The eCBV module also includes a venturi device at least partially disposed in the second outlet port. When the compressor bypass valve is in an open position, a portion of the pressurized air flows through the first outlet port, and a portion of the pressurized air flows from the inlet port through the venturi device and through the second outlet port. When the compressor bypass valve is in the closed position the pressurized air is prevented from flowing into the first outlet port, and all of the pressurized air flows through the venturi device and through the second outlet port.

A vehicle braking system includes an assistance device, having a vacuum pump driven by an engine for communicating vacuum to a chamber of the assistance device. A control valve is interposed along a fluid line between the pump and the chamber. The control valve is in its first operative condition, where the inlet side of the vacuum pump communicates with the chamber, when the pressure within the chamber is above a predetermined value; and is in its second operative condition, where the inlet side of the vacuum pump communicates with the atmosphere, when pressure within the chamber is below a predetermined value. In this second condition the pump intakes air from and feeds air into the atmosphere, thereby reducing the energy consumption by the engine required for driving the pump during stages where, within the chamber there is a vacuum sufficient for the regular operation of the braking system.

A hybrid vehicle includes an engine, a first MG, a second MG, a planetary gear mechanism, and an HV-ECU. The engine includes a supercharger and a purge device. The purge device introduces fuel vapor into an intake passage of the engine. Upon request for fuel purge, when an operating point of the engine is included in an area A, the HV-ECU controls the engine and the first MG to move the operating point to outside of the area A.

Systems and methods for detecting a clogged intake air filter in a turbocharged engine system are provided. In one example a method for an engine coupled to an air filter and to a fuel tank includes indicating air filter clogging responsive to a measured fuel tank pressure during boosted engine operation. In this way, clogging of the air filter may be determined using existing engine system components.

Methods and systems are provided for reducing degradation and issues related to noise, vibration and harshness (NVH) for a fuel tank pressure control valve configured to seal a fuel tank from atmosphere. In one example, a method may include depressurizing the fuel tank of a vehicle by duty cycling a tank pressure control valve and routing fuel vapors from the fuel tank to an engine, while controlling a timing of opening and closing events of the tank pressure control valve to coincide with pressure differences across the tank pressure control valve less than a threshold pressure difference in terms of pressure oscillations across the tank pressure control valve. In this way, higher loads and stress on the tank pressure control valve may be avoided, thus reducing degradation and NVH issues.