Abstract: A variable power drivetrain engine control system for a heavy duty vehicle such as a tractor/trailer combination or truck is disclosed. The engine control system provides higher output capability for the engine of the vehicle in accordance with certain detected conditions. If the vehicle speed falls a predetermined DELTA miles/hour below a LEARNED SPEED of the vehicle, the engine is enabled to operate at a higher power output capability until the vehicle resumes the LEARNED SPEED. Further, high output capability is enabled when the vehicle deceleration is in excess of a predetermined deceleration rate. Again, the high output capability is disabled once the vehicle retains the LEARNED SPEED velocity. The quantity DELTA can be variable with respect to actual vehicle speed to provide more responsive operation of the variable power drivetrain system thereby providing improved responsiveness to road conditions in accordance with relative vehicle speed.

Abstract: A cylinder head gasket for an internal combustion engine is provided having a single first section of a hard gasket material, and a single second section of relatively soft gasket material which is disposed in spaced encompassing relation with the periphery of the first section. The first and second sections coact to form a narrow gap which substantially coincides with the peripheral configuration of the first section. At predetermined locations within the gap, the sections are interconnected whereby the sections will remain in assembled relation at least while the gasket is being positioned between the engine block and cylinder head of the internal combustion engine.

Abstract: A turbocharged internal combustion engine is provided in which the exterior of one side of the engine block has a cavity formed therein. A head is secured to the block and overlies the cylinders formed therein. The head is provided with an internal intake passageway and an internal exhaust passageway for each cylinder formed in the block. One end of each intake passageway communicates with the cavity and one end of each exhaust passageway terminates at the exterior of the head in proximity to the cavity formed in the block. A heat exchange assembly is disposed adjacent the cavity and is provided with a housing which is mounted on the block one side and in overlying relation with the cavity. The housing is provided with an inlet and an outlet spaced therefrom. A heat transfer means is disposed within the housing and is located between the inlet and outlet thereof. The housing outlet communicates with the cavity.

Abstract: An oil cooled system for an internal combustion engine (2 and 2') includes a cylinder liner (22 and 22') shaped to form an annular oil flow passage (36 and 36') by an inner flow control surface (52 and 52') and outer flow control surface (56 and 56') through which engine lubrication oil flows in a very thin film under laminar flow conditions to produce a very large convective heat transfer coefficient of 300-400 BTU's per hour-feet squared-degree Fahrenheit. To insure laminar flow conditions, the radial thickness of the annular flow passage (36 and 36') is held to less than 0.016 inches and is preferably in the range of 0.008 to 0.010 inches.

Abstract: An oil cooling system for an internal combustion engine (2) includes a cylinder liner (22) shaped to form an annular oil flow passage (36) by an inner flow control surface (52) and outer flow control surface (56) through which engine lubrication oil flows in a very thin film under laminar flow conditions to produce a very large convective heat transfer coefficient of 300-400 BTU's per hour-feet squared-degree Fehrenheit. To insure laminar flow conditions, the radial thickness of the annular flow passage 36 is held to less than 0.016 inches and is preferably in the range of 0.008 to 0.010 inches. The disclosed liner (22) is very accurately positioned within a cylinder bore (8) of the engine block (4) by liner stop means (68) for retaining the liner in a fixed axial position within the cylinder bore (8) and by inner and outer radial locating means (106 and 101) positioned, respectively, inwardly and outwardly of the inner flow control surface (52).

Abstract: A modified Stirling cycle type engine (10) includes a pair of cylinders (12,14) in which pistons (16,18) are reciprocably mounted to define a hot and cold side to the engine, a passageway (30) interconnecting the cylinders (12,14) and a regenerator (32) and a cooler (34) in the passageway (30). Exhaust and intake valves (50,54) permit exhaust of working fluid from and supply of fresh air to the hot side. A fuel injector (38) and fuel igniting means (36) are provided for injecting fuel into the passageway (30) adjacent the hot side for admixture with working fluid passing therethrough and ignition within the hot side cylinder (12).

Abstract: An exhaust passage 8 is provided for an internal combustion engine equipped with dual exhaust valves 18 and 19 for each cylinder 12 wherein the passage 8 directs the combination of the two streams formed by the exhaust valve ports 16 into a single stream in a manner to conserve the maximum available energy. Fluid flowing through exhaust ports 16 is directed by a guide vane 54 which has been cast in the exhaust passage 8 wherein vane 54 is formed to contain a keyhole shaped slot 57 to provide clearance for downstream valve stem 21 and to eliminate the disrupting effects which would otherwise result from an oversize clearance hole due to the leading edge effect. Keyhole shaped slot 57 permits unconstrained expansion and contraction of the exhaust passage in response to thermal cycling caused by normal engine operation thereby avoiding the effects of thermal fatigue.

Abstract: This disclosure relates to a coolant system for an internal combustion engine including a turbocharger and an aftercooler. The coolant system comprises an engine loop and an aftercooler loop both loops utilizing a single pump. The engine loop includes the pump, the engine block and head, a first radiator, and a radiator bypass branch. The aftercooler loop includes the pump, the aftercooler, a second radiator, and a radiator bypass branch. Each loop further includes a temperature responsive flow control thermostat for regulating the coolant flow through the associated radiator and/or bypass branch. The thermostat in the aftercooler loop is mounted in the coolant intake line leading to the aftercooler, but it responds to the temperature of the coolant leaving the aftercooler.

Abstract: The disclosure illustrates an insulated composite piston comprising a crown of ceramic or other heat resistant material secured to an aluminum piston body by a bolt of temperature resistant alloy. A low conductivity interface between the crown and the body is provided by a series of stacked discs having low effective thermal conductivity. The relative thermal expansion of the parts is compensated for by bellville washers on the bolt. The above arrangement insulates the crown from the piston body thereby minimizing the temperature gradient across the crown so that its temperature can be maintained as high as necessary to increase efficiency and minimize noxious emissions.