A vaporized-fuel treating apparatus is configured to perform purge control in which a purge valve is placed in an open state while a purge pump is being driven to introduce purge gas from a canister to an intake passage through a purge passage. When an actual value of a flow rate of the purge gas during execution of the purge control is defined as an actual purge flow rate, and an upper-limit value of the purge flow rate to prevent the occurrence of A/F disturbance where A/F in a combustion chamber of an engine excessively fluctuates, as an upper-limit purge flow rate, the number of rotations of the purge pump is controlled during execution of the purge control to adjust the actual purge flow rate to a value equal to or lower than the upper-limit purge flow rate.

In a control apparatus for an internal combustion engine, a vapor concentration learned value learned as a concentration of fuel in purge gas is reflected in an injection amount command value used for fuel injection amount control. An electronic control unit changes a reflection mode of reflecting the vapor concentration learned value in the injection amount command value depending on a pattern of switching an inlet through which the purge gas flows into an intake passage, between a first inlet and a second inlet upstream of the first inlet, and executes the reflection in the changed reflection mode during a period from a start of an intake of intermediate gas into a cylinder to completion of the intake of the intermediate gas. The intermediate gas is present in a portion of the intake passage between the first inlet and the second inlet when switching of the inlet is performed.

An evaporated fuel processing device is installed to a vehicle having an internal combustion engine and a fuel tank and is configured to process evaporated fuel generated through evaporation of fuel in the fuel tank. A control device of the evaporated fuel processing device is configured to adjust an opening degree of a sealing valve based on a pressure of vapor-phase gas sensed with a pressure sensor and a concentration of evaporated fuel in the vapor-phase gas sensed with a concentration sensor and thereby adjust a supply amount of the evaporated fuel supplied to an air intake pipe at a time of executing a purge operation, in which the vapor-phase gas is purged from the fuel tank to the air intake pipe of the internal combustion engine.

The present disclosure relates to an active purge system and an active purge method for a hybrid vehicle, and changes a control method for the throughput of the evaporation gas according to the engine torque according to a change in an optimal operating line, the system efficiency, or the state of charge (SOC) condition of a battery using an active purge unit for pressing the evaporation gas generated by a fuel tank and supplying the pressed evaporation gas to an intake pipe, thereby efficiently purging the evaporation gas.

An evaporative emissions (EVAP) system for an engine of a vehicle includes an ion sensing system configured to measure a fuel/air ratio (FAR) within cylinders of the engine and a controller configured to, during an engine cold start period, perform open-loop lambda control of the engine including obtaining, from the ion sensing system, the measured FAR within the cylinders of the engine, comparing the measured FAR within the cylinders of the engine to a target FAR within cylinders of the engine, and based on the comparing, adjusting operation of at least one of the EVAP system and fuel injectors of the engine to maintain a stoichiometric operation of the engine, wherein the use of the ion sensing system for open-loop lambda control of the engine eliminates the need for a hydrocarbon (HC) sensor in the EVAP system.

Fuel injection control of an engine is executed by setting a required injection amount and an air-fuel ratio correction amount. When setting conditions are met, the air-fuel ratio correction amount is set for a corresponding region to which a current intake air amount or load ratio belongs among a plurality of regions into which the range of the intake air amount or the load ratio is divided such that a region of a larger intake air amount or a higher load ratio becomes wider than a region of a smaller intake air amount or a lower load ratio. When purge conditions are met, a purge control valve is controlled such that purge of supplying an evaporated fuel gas to an intake pipe is executed based on a required purge ratio.

A method for determining the load of a fuel vapor retention filter in a fuel evaporation retention system of an internal combustion engine. The fuel evaporation retention system includes: a fuel supply container for storing fuel, a connection line which couples the fuel supply container to the fuel vapor retention filter, a regeneration line which couples the fuel vapor retention filter to an intake tract of the internal combustion engine and in which an electrically controllable flow control valve is arranged, a ventilation line which couples the fuel vapor retention filter to the atmosphere, an electrically controllable purging air pump arranged in the regeneration line, such that purging air can be directed through the fuel vapor retention filter and supplied to the intake tract in order to regenerate the fuel vapor retention filter.

A purge control unit opens the purge control valve to supply, as purge gas to an intake passage, the evaporative fuel together with air in response to a predetermined purge request. An air-fuel ratio detection unit detects an air-fuel ratio of the internal combustion engine. A concentration learning unit estimates a fuel concentration in the purge gas based on a change in the air-fuel ratio when the purge control unit causes the purge gas to be supplied to the intake passage and to perform a fuel concentration learning to update a concentration learning value, which is a learning value of the fuel concentration in the purge gas, based on the estimated fuel concentration. An injection control unit corrects a fuel injection amount based on the concentration learning value in a period in which the concentration learning unit performs the fuel concentration learning in the lean combustion operation.

A method controls an opening speed of a purge valve according to the purge gas concentration implemented by an active purge system (APS). A purge controller varies, when a valve opening speed of a purge control solenoid valve (PCSV) is controlled, the valve opening speed of the PCSV using any one among a low concentration rate coefficient, a high concentration rate coefficient, a coolant temperature rate coefficient, and an ambient air temperature rate coefficient, and performs the purge control using a difference between the valve opening speeds, and thus dualizes the valve opening speed of the PCSV according to a hydrocarbon (HC) concentration, thereby stably controlling the air-fuel ratio, and simultaneously, securing the purge rate and relatively stably control an air-fuel ratio in a state of high concentration purge execution.

A fuel injection valve is controlled by setting a required injection amount using a required load factor of an engine and a purge correction amount. A purge control valve is controlled using a driving duty based on a required purge ratio when a purge of supplying the evaporated fuel gas to an intake pipe is being executed. During execution of the purge, the purge concentration-related value is learned based on an air-fuel ratio deviation that is a deviation of an air-fuel ratio from a required air-fuel ratio. The certainty of the purge concentration-related value is estimated using a first counter that reflects a number of times of learning of the purge concentration-related value during a first purge and that does not reflect a number of times of learning of the purge concentration-related value during a second purge.