The invention relates to a method for modeling a compressor intake temperature and/or a compressor discharge temperature of a compressor taking into account a compressor surge, wherein the method comprises: Identifying a pressure gradient across the compressor Identifying a mass flow gradient across the compressor Establishing that the compressor surge is present when the pressure gradient exceeds an upper pressure gradient limit and the mass flow gradient falls below a lower mass flow gradient limit; and Identifying the compressor intake temperature with a temperature correction factor that is dependent on the compressor surge and/or identifying the compressor discharge temperature on the basis of a corrected compressor discharge pressure that is dependent on the compressor surge.

A system and method for controlling a hybrid vehicle having an engine, first and second electric machines coupled to a traction battery and configured to operate primarily as a motor and a generator, respectively, and a controller in communication with the engine and the first and second electric machines include increasing target engine speed from a sea level speed to deliver a demanded engine power at altitude up to an NVH engine speed limit. The system and method may reduce the demanded engine power based on an attainable engine power associated with the NVH engine speed limit. A demanded wheel power may be reduced in response to the reduced engine power.

A system according to the present disclosure includes a valve control module, a purge fraction module, and a diagnostic module. The valve control module opens a purge valve in an evaporative emissions system to allow purge vapor to flow to an intake system of an engine. The purge fraction module determines first and second fractions of purge vapor delivered to the engine relative to a total amount of air and purge vapor delivered to the engine based on first and second inputs, respectively. The first input is from a hydrocarbon sensor disposed in the evaporative emissions system of the engine. The second input is from an oxygen sensor disposed in an exhaust system of the engine. The diagnostic module selectively diagnoses a fault in at least one of the evaporative emissions system and the hydrocarbon sensor based on the first and second purge fractions when the purge valve is open.

Methods and systems are provided for controlling boost pressure in a staged engine system comprising a turbocharger and an upstream electric supercharger based on altitude. During vehicle operation at higher altitudes, where vacuum availability for wastegate actuation is limited, boost pressure may be provided by operating the electric supercharger more aggressively. The wastegate may be used for boost control once the vacuum reserve is replenished.

Disclosed is a method for acquiring an altitude correction coefficient, comprising: acquiring an initial value of an altitude correction coefficient self-learning filter when a preset event occurs to a vehicle engine, the preset event includes a power-off event, a power-on event, and an unexpected power-down event; evaluating whether the vehicle satisfies a preset self-learning enabling condition, in accordance with an engine rotation speed, a vehicle speed, and status information of designated devices; enabling the altitude correction coefficient self-learning filter when the vehicle satisfies the preset self-learning enabling condition; determining an input of the altitude correction coefficient self-learning filter at least in accordance with operating states of a manifold pressure sensor and a stepping motor; and obtaining a current altitude correction coefficient by self-learning the altitude correction coefficient applying the altitude correction coefficient self-learning filter in accordance with the initial value of the altitude correction coefficient self-learning filter and the input of the altitude correction coefficient self-learning filter. An apparatus for acquiring an altitude correction coefficient is also disclosed. The above method and apparatus improve the accuracy of the altitude correction coefficient and enhance the idling satiability.

Methods and systems are provided for controlling a boosted engine system, having a turbocharger and a charge air cooler, to limit overheating of a compressor outlet. In one example, a method includes predicting an engine torque profile based on current and future engine operating conditions. The method then models a compressor outlet temperature profile and reduces engine torque output to limit overheating of the compressor outlet.

The present invention provides a novel combination of devices to measure and transmit to an electronic controller data pertaining to differential pressures, temperatures, regeneration status, exhaust content, accumulated gas consumption and substitute fuel consumption. The electronic controller compares the data to thresholds; when the controller receives signals indicating these thresholds or limits are met, the controller causes the gas substitution rate to be diminished or set to zero until after-treatments elements are fully regenerated thereby facilitating integration of a mixed fuel system with an application internal combustion engine.

Various methods and systems are provided for a multi-fuel capable engine. In one example, a system comprises an engine having at least one cylinder controlled via an intake valve, a first fuel system to deliver liquid fuel and a second fuel system to deliver gaseous fuel to the at least one cylinder, a variable valve timing actuation system to adjust one or more of an opening or a closing timing of the intake valve, and a controller. The controller is configured to, during a liquid fuel only mode, adjust the variable valve timing actuation system to close the intake valve at a first timing based at least on engine load, and during a multi-fuel mode, adjust the variable valve timing actuation system to close the intake valve at a second timing.

An internal combustion engine management system includes: a plurality of internal combustion engine units of which each includes an internal combustion engine, a first communicator configured to communicate with a server device, and a communication controller configured to transmit at least estimation information out of the estimation information which is used to estimate an environment in which the internal combustion engine is placed and information of a control map which is used to control the internal combustion engine to the server device using the first communicator; and the server device that includes a second communicator configured to communicate with the first communicator, and a processor configured to extract a second internal combustion engine unit having transmitted estimation information which is similar to the estimation information received from a first internal combustion engine unit out of the plurality of internal combustion engine units from the plurality of internal combustion engine units and to transmit the information of a control map received from the second internal combustion engine unit to the first internal combustion engine unit using the second communicator.

Methods and systems are provided for opportunistically conducting an evaporative emissions test diagnostic procedure in order to indicate the presence or absence of undesired evaporative emissions in a vehicle evaporative emissions control system and fuel system. In one example, tire pressure and barometric pressure are monitored, and responsive to a tire pressure decrease in the absence of a barometric pressure increase, along with an indication that the vehicle transmission is in neutral and that the vehicle is not traveling downhill, the evaporative emissions system and fuel system may be sealed and the presence or absence of undesired evaporative emissions indicated based on a vacuum-build. In this way, an opportunistic evaporative emissions test may be conducted based on conditions favorable to conducting an emissions test procedure, and may thus increase test completion rates and reduce undesired evaporative emissions.