An internal combustion engine control method controls an internal combustion engine equipped with an exhaust gas temperature variation factor unit that varies the temperature of an exhaust gas of the internal combustion engine, an exhaust heat recovery device disposed in an exhaust passage downstream of the exhaust gas temperature variation factor unit and that recovers the heat from the exhaust gas into a refrigerant that cools the internal combustion engine, and a refrigerant flow rate adjustment unit that adjusts a flow rate of the refrigerant that passes through the exhaust heat recovery device. The internal combustion engine control method estimates a boiling margin, which is a parameter related to a thermal margin when the refrigerant boils in the exhaust heat recovery device, and determines whether to execute a boiling avoidance process in accordance with the boiling margin.

An internal combustion engine control method controls an internal combustion engine equipped with an exhaust gas temperature variation factor unit that varies the temperature of an exhaust gas of the internal combustion engine, an exhaust heat recovery device disposed in an exhaust passage downstream of the exhaust gas temperature variation factor unit and that recovers the heat from the exhaust gas into a refrigerant that cools the internal combustion engine, and a refrigerant flow rate adjustment unit that adjusts a flow rate of the refrigerant that passes through the exhaust heat recovery device. The internal combustion engine control method estimates a boiling margin, which is a parameter related to a thermal margin when the refrigerant boils in the exhaust heat recovery device, and determines whether to execute a boiling avoidance process in accordance with the boiling margin.

A cooling system is for cooling a marine engine having an engine block and a cylinder head, and a supercharger configured to provide charge air for combustion in the marine engine. The cooling system has a charge air cooler configured to cool the charge air prior to combustion in the marine engine. The cooling system is configured to circulate cooling water from a body of water in which the marine engine is operating to the marine engine and then back to the body of water. The cooling system is further configured to convey the cooling water in parallel to the marine engine and the charge air cooler. A sprayer is configured to spray the cooling water into exhaust gas discharged from the marine engine. The cooling system is configured to convey the cooling water in series to the charge air cooler and then to the sprayer.

A vehicular thermal management system is provided that includes an internal combustion engine, a heat recoverer, an engine oil heat exchanger, a drivetrain oil heat exchanger, a coolant pump, and a coolant circuit that fluidly connects the preceding components. The drivetrain oil heat exchanger and the engine oil heat exchanger are arranged in series within the coolant circuit.

A tube-pin assembly for a heat exchanger of a vehicle includes a housing having an inlet into which exhaust gas flows; a plurality of tubes arranged inside the housing to provide a passage through which the exhaust gas flows; and cooling pins provided between the tubes to provide a coolant passage through which coolant flows, where a foamed metal made of a porous material is provided inside at least one of the tubes.

A humid air system (HAS) for reducing NOx emissions of an LPG-powered forklift and other heavy equipment is disclosed. A humid air system (HAS) uses distilled water and heat of exhaust to generate steam, injected at the intake air of the engine to increase humidity and reduce temperature and NOx emission. The system includes a pipe with a coiled-tube insert that is attached to the exhaust. A water pump connected to a solenoid valve supplies distilled water from a container to the exhaust coil, generating steam that is fed to a mixing box at the engine air intake in order to increase intake air humidity. A feedback control system controls the solenoid valve opening to adjust the water flow rate for maintaining humidity level between 90% to saturation.

Operating a machine system for co-production of electrical power and filtered potable water includes operating an electrical generator by way of rotation of an engine output shaft to produce electrical power, and collecting water condensed from cooled treated exhaust from the engine for delivery to an outgoing water conduit. Operating the machine system further includes supplying electrical power produced by the electrical generator to an in situ electrical load, and to at least one ex situ electrical load such as a power grid. The in situ electrical load is produced by at least one of an exhaust conveyance device, an air conveyance device, or a water conveyance device in a water subsystem.

A humid air system (HAS) for reducing NOx emissions of an LPG-powered forklift and other heavy equipment is disclosed. A humid air system (HAS) uses distilled water and heat of exhaust to generate steam, injected at the intake air of the engine to increase humidity and reduce temperature and NOx emission. The system includes a pipe with a coiled-tube insert that is attached to the exhaust. A water pump connected to a solenoid valve supplies distilled water from a container to the exhaust coil, generating steam that is fed to a mixing box at the engine air intake in order to increase intake air humidity. A feedback control system controls the solenoid valve opening to adjust the water flow rate for maintaining humidity level between 90% to saturation.

Improved processes and systems for removing CO.sub.2 from exhaust gas to substantially prevent such greenhouse gas from being released to the atmosphere. The systems and processes use a) staged cooling of an exhaust gas stream, b) addition of an antifreeze, and c) a combination of non-scraped heat exchangers and scraped heat exchangers to separate CO.sub.2 from an exhaust stream while reducing or minimizing accumulation of ice on surfaces within the system.

An internal combustion engine, ICE, system for a vehicle includes an ICE operable on a main fuel component containing hydrogen gas or hydrogen liquid, said ICE having at least one combustion chamber; an exhaust gas aftertreatment system, EATS, arranged in an exhaust gas circuit downstream the ICE, said EATS having at least one NOx reduction device and/or a particulate filter, and an exhaust gas water recovery, EWR, system arranged at least partly downstream the NOx reduction device in the exhaust gas circuit, said EWR system having at least a primary exhaust cooler and a water separator; a waste heat recovery, WHR, system for providing a rankine cycle, said WHR system being arranged to transport a working fluid, WF, through the primary exhaust cooler of the EWR system; a low temperature coolant circuit in fluid communication an exhaust condenser of the EWR system; and a water management system arranged in fluid communication with the water separator of the EWR system, said water management system being arranged to collect water from the EWR system and transport water in a liquid fluid circuit to the at least one combustion chamber.