When an internal combustion engine operates in a stoichiometric mode, a control apparatus operates a cooling system so that the temperature of intake air becomes 45° C. When the internal combustion engine operates in a lean mode, the control apparatus operates the cooling system so that the temperature of intake air becomes 35° C. Also, the control apparatus calculates a crank angle period from an ignition timing until a crank angle at which a mass fraction burned becomes 10% and adjusts a fuel injection amount so that the SA-CA10 coincides with a target SA-CA10. Then, the control apparatus sets the target SA-CA10 short immediately after switching from the stoichiometric mode to the lean mode and extends the target SA-CA10 in accordance with a decrease in the temperature of intake air.

A fluid control system for an engine may include an air pathway to carry air to the engine, a fuel pathway to carry a fuel to the engine, and at least one temperature control device to control temperatures of the air and the fuel. The temperature control device maintains the air and the fuel at a temperature based on a target air-fuel ratio and a target volume of the air and the fuel.

The high pressure compressor wheel of a two stage turbocharger assembly is cooled by charge air bled from the charge air flowpath downstream of the aftercooler. A wastegate may be arranged across the high pressure stage and operated by an actuator which in turn is operable by the static or dynamic pressure of the charge air in the cooling flowpath. The cooling airflow may be blocked to open the wastegate and released or resumed to close the wastegate so that cooling air is supplied only while the high pressure compressor wheel is under load.

An intake-air cooling system configured to cool intake air of a vehicle engine is provided, which includes an intake passage, a compressor, an evaporator, and a controller. The intake passage branches to first and second intake passages and is provided with a damper configured to change a ratio between air flow rates flowing into the first and second intake passages. The evaporator is provided to the second intake passage and cools the air flowing therethrough. When the controller does not determine that the engine driving state belongs to a knock occurring range, the controller controls the compressor so that a flow rate of refrigerant supplied to the evaporator becomes smaller within a range larger than zero, and controls the damper so that the ratio of the flow rate of the air flowing into the second intake passage becomes smaller, than a case the state belongs to the knock occurring range.

Systems and methods for thermal management of a direct injection propane fuel system are disclosed that include control a temperature of the fuel tank at or below a desired operating temperature to avoid venting of fuel to atmosphere.

A fluid control system for an engine may include an air pathway to carry air to the engine, a fuel pathway to carry a fuel to the engine, and at least one temperature control device to control temperatures of the air and the fuel. The temperature control device maintains the air and the fuel at a temperature based on a target air-fuel ratio and a target volume of the air and the fuel.

Systems and methods for thermal management of a direct injection propane fuel system are disclosed that include control a temperature of the fuel tank at or below a desired operating temperature to avoid venting of fuel to atmosphere.

A battery temperature adjusting device for a vehicle on which a battery is mounted, the battery being a lithium ion battery disposed near a powertrain unit inside an engine bay, is provided. The device includes a first air duct provided to an intake passage configured to lead intake air to a combustion chamber of an engine, a second air duct provided to the intake passage and provided with an intake opening that opens toward a space between the powertrain unit and the battery, an intake-air-amount adjusting part, and a controller configured to acquire an ambient temperature of the powertrain unit. The controller increases a ratio of the second intake air amount relative to the sum of the first intake air amount and the second intake air amount, when the ambient temperature exceeds a first threshold temperature, compared with when the ambient temperature is below the first threshold temperature.

Methods and systems are provided for cooling fuel in an engine. In one example, a fuel temperature is reduced by transferring heat from the fuel to a cooling fluid. The heat exchange may occur in an unpressurized region of a fuel system.

The high pressure compressor wheel of a two stage turbocharger assembly is cooled by charge air bled from the charge air flowpath downstream of the aftercooler. A wastegate may be arranged across the high pressure stage and operated by an actuator which in turn is operable by the static or dynamic pressure of the charge air in the cooling flowpath. The cooling airflow may be blocked to open the wastegate and released or resumed to close the wastegate so that cooling air is supplied only while the high pressure compressor wheel is under load.