A novel two-stroke opposed piston engine with sleeve valves and T-scavenging breathing is provided. The two-stroke opposed piston engine has a unique uni-flow scavenging breathing that can deliver higher power density than the traditional uniflow-scavenging two-stroke opposed piston engine. Furthermore, a method of operating a two-stroke opposed piston engine is provided. The novel opposed piston engine can be a hybrid engine with one or more electric machines.

A novel two-stroke opposed piston engine with sleeve valves and T-scavenging breathing is provided. The two-stroke opposed piston engine has a unique uni-flow scavenging breathing that can deliver higher power density than the traditional uniflow-scavenging two-stroke opposed piston engine. Furthermore, a method of operating a two-stroke opposed piston engine is provided. The novel opposed piston engine can be a hybrid engine with one or more electric machines.

Two-stroke engine includes a cylinder having a peripheral wall defining an interior space, a crankshaft coupled to a piston movable in the cylinder and having a power stroke in which air/fuel in the interior space is ignited and the crankshaft is rotated and a compression stroke, two intake conduits leading to the cylinder, and intake valves in the intake conduits that regulate air flow into the interior space. An exhaust conduit leads from an opening in the peripheral wall between lowermost and uppermost positions of the piston. An exhaust valve is in the exhaust conduit. In an exhaust-intake stroke after the power stroke when the piston has moved such that its upper surface is below the opening, the outlet valve opens, and air is inlet into the interior space through the intake valve(s) and forces combustion products to exhaust the interior space into the exhaust conduit.

Two-stroke engine includes a cylinder having a peripheral wall defining an interior space, a crankshaft coupled to a piston movable in the cylinder and having a power stroke in which air/fuel in the interior space is ignited and the crankshaft is rotated and a compression stroke, two intake conduits leading to the cylinder, and intake valves in the intake conduits that regulate air flow into the interior space. An exhaust conduit leads from an opening in the peripheral wall between lowermost and uppermost positions of the piston. An exhaust valve is in the exhaust conduit. In an exhaust-intake stroke after the power stroke when the piston has moved such that its upper surface is below the opening, the outlet valve opens, and air is inlet into the interior space through the intake valve(s) and forces combustion products to exhaust the interior space into the exhaust conduit.

A split cycle internal combustion engine apparatus includes a combustion cylinder accommodating a combustion piston and a compression cylinder accommodating a compression piston. The apparatus is arranged to provide compressed fluid to the combustion cylinder. The compression cylinder is coupled to a first liquid coolant reservoir and a second liquid coolant reservoir. A controller is arranged to receive an indication of at least one parameter associated with the engine, and control delivery of at least one of the first liquid coolant from the first liquid coolant reservoir and the second liquid coolant from the second liquid coolant reservoir to the compression cylinder based on the indication of the at least one parameter such that the at least one liquid coolant vaporises into a gaseous phase during a compression stroke.

A split cycle internal combustion engine apparatus includes a combustion cylinder accommodating a combustion piston and a compression cylinder accommodating a compression piston. The apparatus is arranged to provide compressed fluid to the combustion cylinder. The compression cylinder is coupled to a first liquid coolant reservoir and a second liquid coolant reservoir. A controller is arranged to receive an indication of at least one parameter associated with the engine, and control delivery of at least one of the first liquid coolant from the first liquid coolant reservoir and the second liquid coolant from the second liquid coolant reservoir to the compression cylinder based on the indication of the at least one parameter such that the at least one liquid coolant vaporises into a gaseous phase during a compression stroke.

The invention pertains to gas exchange in internal combustion engines using low to zero-emission fuels. The combustion engine has the ability to regulate the quantity of air/fuel mixture in the cylinder using one or more exhaust valve(s) (2) that can have adjustable opening times in order to control the gas exchange in the cylinder so that exhaust and alternatively also air can be expelled into the exhaust system. By reducing the quantity of air and thus the quantity of fuel for each cycle, that combined with reduced compression pressure means that engines can operate with a higher expansion ratio by leaving the exhaust valve(s) (2) open through a part of the compression stroke to reduce the amount of air to the combustion and reduce compression and then pressure rise before combustion. Air volume and gas exchange are regulated by compressor(s) (5) as well as opening and closing of exhaust valve(s) (2) with the exhaust valve control (4); alternatively, also intake valves for 4-stroke engines.

A radial compressor employs a compressor wheel having an inducer. An inlet air passage has a first region and a second region separated from the first region by a divider wall. The divider wall extends from an inlet plane of the inducer and connects the first region to a first air filter and said second region to a second air filter.

A radial compressor employs a compressor wheel having an inducer. An inlet air passage has a first region and a second region separated from the first region by a divider wall. The divider wall extends from an inlet plane of the inducer and connects the first region to a first air filter and said second region to a second air filter.

Aspects of the disclosure are directed to an engine crank. In accordance with one aspect, the engine crank includes a first web, wherein the first web includes a first plurality of air channels, and a second web coupled to the first web, wherein the second web includes a second plurality of air channels.