Abstract: A start control apparatus of an internal combustion engine includes: a gas sensor configured to detect a gas concentration of the liquefied gas fuel in a gasified state at a position near a combustion chamber; a scavenging pump configured to perform scavenging from a position upstream of the combustion chamber to a position downstream of the combustion chamber; and a control unit configured to prohibit a start of the internal combustion engine and operate the scavenging pump when the gas concentration detected by the gas sensor before the start of the internal combustion engine is equal to or greater than a predetermined threshold value.

Abstract: A mixed fuel supply system includes a dimethyl ether (“DME”) tank which stores DME, a DME supply path which supplies the DME and a light oil supply system. The DME supply path is connected to a transfer path between a feed pump and a fuel injection pump. The DME supply path includes a flow regulating valve, in which a supply amount QDME of the DME is approximately 10% of a total supply amount Qfuel of a fuel in weight ratio. The fuel is mixed in the transfer path and transferred to the fuel injection pump, and then injected from injectors.

Abstract: A first vapor phase valve including a housing, a flow passage in the housing, a main valve to block or open the flow passage, and an excess flow valve to block the flow passage when vapor phase dimethyl ether flows through the flow passage. The first vapor phase valve includes: a pressure chamber communicating with a pressure opening portion of the housing and a fixed shaft connected to the excess flow valve to maintain the excess flow valve in an open state by using pressure of liquid phase dimethyl ether flowing into the pressure chamber from the pressure opening portion. The excess flow valve, in order to prevent fluid from flowing out at a specified flow rate or more, can be forcedly opened.

Abstract: To provide a variable valve driving device which can accurately control the lift amount of valves and can be manufactured at a low cost. The device has: valves (10) serving as intake valves or exhaust valves of an engine; springs (11) for biasing the valves (10) in the valve closing direction; a cam (12) for pressing the valves (10) in the valve opening direction against a biasing force of the springs; a piston (19) joined to the valves (10); a control chamber (21) configured by a piston insertion hole (20) into which the piston (19) is inserted; and a control mechanism (24) for changing the valve closing timing of the valves (10) by controlling the introduction and discharge of a working fluid into and from the control chamber (21).

Abstract: To provide a variable valve driving device which can accurately control the lift amount of valves and can be manufactured at a low cost. The device has: valves (10) serving as intake valves or exhaust valves of an engine; springs (11) for biasing the valves (10) in the valve closing direction; a cam (12) for pressing the valves (10) in the valve opening direction against a biasing force of the springs; a piston (19) joined to the valves (10); a control chamber (21) configured by a piston insertion hole (20) into which the piston (19) is inserted; and a control mechanism (24) for changing the valve closing timing of the valves (10) by controlling the introduction and discharge of a working fluid into and from the control chamber (21).

Abstract: The object of the present invention is to provide a fuel return device whereby the residual amounts of fuel in a plurality of fuel tanks can be made approximately equal. According to one preferred mode of the present invention, the fuel return device comprises: residual amount detecting means for detecting the residual amount of fuel in respective fuel tanks; and fuel return distribution adjusting means for adjusting the distribution of the fuel returning to the respective fuel tanks, in accordance with the values detected by the residual amount detecting means, in such a manner that the residual amounts of fuel inside each of the fuel tanks are approximately equal.

Abstract: The object of the present invention is to provide a fuel return device whereby the residual amounts of fuel in a plurality of fuel tanks can be made approximately equal. According to one preferred mode of the present invention, the fuel return device comprises: residual amount detecting means for detecting the residual amount of fuel in respective fuel tanks; and fuel return distribution adjusting means for adjusting the distribution of the fuel returning to the respective fuel tanks, in accordance with the values detected by the residual amount detecting means, in such a manner that the residual amounts of fuel inside each of the fuel tanks are approximately equal.

Abstract: This invention concerns a turbo-charged engine with EGR comprising an EGR passage connecting an exhaust passage upstream of a turbine of a turbocharger and an intake passage downstream of a compressor to each other for returning some of exhaust gas in the exhaust passage to the intake passage, and an EGR valve provided in the EGR passage for adjusting a passage area of the EGR passage. Capacity of the turbine is set such that in a high speed and high load region of the engine operating state, if the exhaust gas is supplied to the turbine with the EGR valve closed, the turbocharger overruns beyond a maximum speed limit, and if the EGR valve is opened to return some of the exhaust gas to the intake passage, the turbocharger rotates at less speed than the maximum speed limit. EGR can be performed in the high speed and high load region of the engine operating state without reducing power output and worsening fuel consumption.

Abstract: This invention concerns a turbo-charged engine with EGR comprising an EGR passage connecting an exhaust passage upstream of a turbine of a turbocharger and an intake passage downstream of a compressor to each other for returning some of exhaust gas in the exhaust passage to the intake passage, and an EGR valve provided in the EGR passage for adjusting a passage area of the EGR passage. Capacity of the turbine is set such that in a high speed and high load region of the engine operating state, if the exhaust gas is supplied to the turbine with the EGR valve closed, the turbocharger overruns beyond a maximum speed limit, and if the EGR valve is opened to return some of the exhaust gas to the intake passage, the turbocharger rotates at less speed than the maximum speed limit. EGR can be performed in the high speed and high load region of the engine operating state without reducing power output and worsening fuel consumption.

Abstract: The fuel injection device of this invention utilizes the fuel pressure in the balance chamber for closing the open-close valve to prevent fuel leakage from the open-close portion. When the open-close valve is opened, the valve stem of the open-close valve piercing through the exhaust passage in the control member moves toward the balance chamber. The valve head opens the port of the exhaust passage on the balance chamber side to lower the fuel pressure in the balance chamber, with the result that the needle valve lifts injecting the fuel. When the open-close valve is closed by the return spring, the fuel pressure in the balance chamber acts on the valve head to urge the open-close valve in the valve closing direction, preventing the leakage of fuel through the open-close valve.

Abstract: This fuel injector for internal combustion engines makes the best use of the responsiveness of a piezoelectric element and the leakage resistance and fixing easiness of a solenoid type fuel injection nozzle, and secures a sufficient lift of a control piston. In this fuel injector, a control piston is connected to and controls a sliding movement of a needle valve, and a return spring provided in a fuel chamber urges the needle valve in the injection port closing direction, the lift of the control piston being controlled by a piezoelectric element which is adapted to be displaced in accordance with voltage variation. The displacement of the piezoelectric element is increased by the effect of lever and fulcrum of a displacement increasing mechanism, and the resultant displacement is transmitted to the control piston, whereby the lift of the control piston and needle valve is secured.