摘要:
A control device for Diesel engines with which a rapid shutoff of the latter is possible by emptying the suction chamber of the injection pump by aspiration. The control device includes a control valve, which in the operating position (I) opens up the feed line of the feed pump toward the suction chamber and in the reversed shutoff position (II) blocks this feed line between the compression side (D) of the feed pump and the suction chamber. The control valve is an electromagnetic shutoff valve. A further part of the control device is an electric fuel pump, which as a special aspirating pump is disposed in an aspiration line leading from the suction chamber back to the fuel tank. For emergency engine shutoff, the control valve, displaced into its blocking position (II), blocks the flow of fuel between the feed pump and the suction chamber, while the aspirating fuel pump that has been turned on at the same time empties the suction chamber by aspiration. The emergency shutoff takes place rapidly, thereby reliably preventing engine damage and accidents.
摘要:
The invention is directed to a method for assuring emergency driving functions with a diesel engine when the fuel temperature sensor fails, the diesel engine having a charging-air blower and a charging-air temperature sensor. The method includes performing a fuel temperature dependent correction of specific operating functions by taking the charging air temperature as a basis such that all functions corresponding to a fuel temperature of T.sub.K =+20.degree. C. are fulfilled at a charging air temperature of T.sub.L .gtoreq.0.degree. C. and all functions corresponding to a fuel temperature of T.sub.K =-10.degree. C. are fulfilled at a charging air temperature of T.sub.L
摘要:
A thread wiper assembly mountable to the side of a sewing machine. The thread wiper assembly is particularly advantageous with sewing machines that are equipped with a walking foot. The thread wiper is mounted sidewardly relative to the needle and includes a picker arm, that while in a retracted position, is disposed sidewardly relative to the needle and out of its path of travel. Because the thread wiper is mounted to the side of the sewing machine and sidewardly relative to the needle, the picker arm is able to traverse along a path between the needle and the walking foot without interference. An actuating member: (i) lowers the picker arm in a direction substantially parallel to the needle until a free end of the picker arm is at a level between the needle and the walking foot; (ii) sidewardly thrusts the picker arm at a first angle, relative to a vertical axis, towards the needle along a path between the needle and the walking foot without interference; (iii) advances further sideways the picker arm at a second angle, relative to the vertical axis, greater than the first angle; and (iv) retracts away while raising the picker member in a reverse movement to complete the cycle. The thread wiper may include a microprocessor that is programmed to intelligently disable/enable the thread wiper depending on such factors as the adjustment in rise of the walking foot and/or whether the turn back operation of the sewing machine is activated. The thread wiper assembly is also suitable for use with a sewing machine that does not have a walking foot.
摘要:
A fuel injection system in which, by means of a controlled zero-feed throttle or by the elimination of the zero-feed throttle and by a suitable control of the pressure valve of a common rail, the starting performance of the internal combustion engine can be improved, and at the same time it is assured that in the overrunning mode of the engine, an excessively high pressure is not built up in the common rail.
摘要:
A control device for Diesel engines is proposed in which a rapid shutoff of the engine can be effected by evacuating the suction chamber of the injection pump. The control device includes a supply pump and a reversal valve, which in a stop position connects the suction chamber with the intake side of the supply pump and connects the compression side of the supply pump with the fuel tank. A check valve is provided in the supply line between the supply pump and the fuel filter which, when closed, is vacuum-tight; this check valve is disposed to open toward the filter, counter to the force of a valve closing spring. Another check valve, comprising an overflow valve determining the suction chamber pressure, is provided in an overflow line leading from the suction chamber to the fuel tank; this overflow valve is also vacuum-tight when closed. When the reversal valve is actuated by an electromagnet, a similar key-actuated shutoff to that known in gasoline engines can also be effected in Diesel engines. The circuitry of this embodiment also enables an involuntary "rolling start" to be blocked, and allows for a fail-safe shutoff of the engine in case of a malfunction in the governor shutoff device.
摘要:
The invention proposes a fuel supply system for internal combustion engines, having a fuel tank (1) and a fuel reservoir (5) disposed therein, having a fuel pump (11), which drives one or more jet pumps (13), each by means of a supply line (21), the jet pumps (13) in turn filling the fuel reservoir (5) with fuel from the fuel tank (1). There is also a fuel line (7), which hydraulically connects the fuel reservoir (5) to the engine. During the starting of the engine, the fuel pump (11) feeds fuel into the fuel line (7), thus improving the starting behavior of the engine.
摘要:
A common rail fuel injection system in which the pressure in the return line is controlled as a function of the delivery pressure of the presupply pump. This improves the operating behavior of a high-pressure fuel pump and the injectors which are supplied with fuel by means of a common rail. The pressure in the return line is controlled by means of a pressure control valve.
摘要:
A fuel system is disclosed in which high-pressure fuel pump with a prefeed pump is proposed, in which the fuel quantity pumped by the prefeed pump is distributed for cooling and lubrication purposes, via a continuously adjustable multiposition valve, to the pump elements of the high-pressure fuel pump or to the low-pressure region of the high-pressure fuel pump. The multiposition valve is controlled by the control unit of the engine. An advantageous feature of the high-pressure fuel pump of the invention is that depending on the operating state of the engine and of the high-pressure fuel pump, an optimal distribution of the fuel quantity pumped by the prefeed pump can always be accomplished. Moreover, the energy demand by the prefeed pump is reduced and its service life is lengthened.
摘要:
A fuel injection system having a prefeed pump, through which fuel from a fuel supply container is pumped to a high-pressure pump, and by means of the high-pressure pump, fuel is pumped into a reservoir. Communicating with the reservoir is at least one injector, through which fuel is injected to the engine. A fuel filter is disposed between the prefeed pump and the high-pressure pump. A return line for uninjected fuel leads back from at least one injector into a region upstream of the high-pressure pump. A valve is provided, by which the return line, in a first switching position, at a low fuel temperature, leads to upstream of the fuel filter, between it and the prefeed pump, and by which the return line, in a second switching position, at a high fuel temperature, leads to downstream of the fuel filter, between it and the high-pressure pump.