Abstract: An engine includes a variable geometry turbocharger, an EGR valve device, a hydraulic servo drive device that drives the variable geometry turbocharger, a hydraulic servo drive device that drives the EGR valve device, an electronic proportional control valve (EPC valve) that supplies pilot pressure oil to the hydraulic servo drive device, and an electronic proportional control valve (EPC valve) that supplies pilot pressure oil to the hydraulic servo drive device, the EPC valves being attached to the EGR valve device.

Abstract: An engine fuel supply system is provided at a reduced cost by using a HC dosing pump that supplies fuel into an exhaust pipe also as a pump for a cylinder fuel supply device. When a signal is generated to command air removal from a cylinder fuel supply passage, the dual-purpose pump is activated, a first on-off valve assumes an open state, and a second on-off valve assumes a close state, so that the fuel is supplied from the dual-purpose pump to the cylinder fuel supply passage via an air-removal fuel supply passage. When a signal is generated to command fuel supply into the exhaust pipe, the dual-purpose pump is activated, the second on-off valve assumes the open state, and the first on-off valve assumes the close state, so that the fuel is supplied from the dual-purpose pump to the exhaust pipe via the exhaust-pipe fuel supply passage.

Abstract: An engine includes a variable geometry turbocharger, an EGR valve device, a hydraulic servo drive device that drives the variable geometry turbocharger, a hydraulic servo drive device that drives the EGR valve device, an electronic proportional control valve (EPC valve) that supplies pilot pressure oil to the hydraulic servo drive device, and an electronic proportional control valve (EPC valve) that supplies pilot pressure oil to the hydraulic servo drive device, the EPC valves being attached to the EGR valve device.

Abstract: An engine fuel supply system is provided at a reduced cost by using a HC dosing pump that supplies fuel into an exhaust pipe also as a pump for a cylinder fuel supply device. When a signal is generated to command air removal from a cylinder fuel supply passage, the dual-purpose pump is activated, a first on-off valve assumes an open state, and a second on-off valve assumes a close state, so that the fuel is supplied from the dual-purpose pump to the cylinder fuel supply passage via an air-removal fuel supply passage. When a signal is generated to command fuel supply into the exhaust pipe, the dual-purpose pump is activated, the second on-off valve assumes the open state, and the first on-off valve assumes the close state, so that the fuel is supplied from the dual-purpose pump to the exhaust pipe via the exhaust-pipe fuel supply passage.

Abstract: The present invention provides an apparatus for cooling an internal combustion engine having a supercharger attached thereto, wherein the apparatus includes communication passages and by way of which the upper end of a coolant flow passage for circulating coolant through the internal combustion engine and a coolant flow passage for circulating coolant through the supercharger communicates with an upper tank installed on a radiator so that cooling of the supercharge and separating of air from coolant can simultaneously be accomplished by arranged of the communication passages.

Abstract: A fluid lubricating circuit for an internal combustion engine which can effectively damp or reduce fluid pressure pulsation in the circuit. To this end, the circuit includes a pressure damper connected between a hydraulic pump and an oil cooler. The pressure damper has formed therein a pair of orifices disposed in a spaced relation from each other in a direction of fluid flow and a damping chamber between the orifices.