Abstract: The invention provides a controller of an engine and a variable capacity pump which can perform a speedy work even under a heavy load and a strong work at the critical moment. Accordingly, there is provided control means (30) which outputs commands to a fuel injection pump (2), relief control means (19, 21) and variable capacity pump output control means (27, 29) so that when a signal for an on operation of an active mode switch (7) is inputted, the product of a pump discharge pressure P by a pump discharge amount Q is expressed by a P-Q constant horsepower curve Ha in an active mode in which the product of P and Q is higher than a predetermined value in the normal operation, and when a signal for an on operation of a power mode switch (9) is inputted, the product of the pump discharge pressure P by the pump discharge amount Q is expressed by a P-Q constant horsepower curve Hap in a power active mode in which the product of P and Q is higher than that in the active mode by one stage.

Abstract: The pump controller 40 determines pump load torques T.sub.r1, T.sub.r2 from tilting signals .theta..sub.1, .theta..sub.2 of hydraulic pumps 1, 2 and delivery pressure signals P.sub.D1, P.sub.D2 of the hydraulic pumps 1, 2 based on T.sub.r1 =K.multidot..theta..sub.1 .multidot.P.sub.D1 and T.sub.r2 =K.multidot..theta..sub.2 .multidot.P.sub.D2 (K: constant), and adds these pump load torques to provide a resulting value as an engine load torque signal T. Using the signal T, an engine controller 50 calculates fuel injecting timing depending on the engine load torque to control a timer actuator 55. This makes it possible to control the fuel injection timing with good response and high accuracy following load fluctuation, achieve optimum combustion, and prevent such a deterioration of exhaust gas as caused by the generation of No.sub.x.

Abstract: The pump controller determines pump load torques (T.sub.r1, T.sub.r2) from tilting signals (.theta..sub.1, .theta..sub.2) of hydraulic pumps and delivery pressure signals ( P.sub.D1, P.sub.D2) of the hydraulic pumps based on T.sub.r1 =K.multidot..theta..sub.1 .multidot.P.sub.D1 and T.sub.r2 =K.multidot..theta..sub.2 .multidot.P.sub.D2 (K: constant), and adds these pump load torques to provide a resulting value as an engine load torque signal (T). Using the signal (T) and an engine revolution speed signal, an engine controller determines a fuel injecting rate to control a pre-stroke actuator. Simultaneously, the engine controller calculates target injection timing not to change fuel injection start timing, thereby controlling a timer actuator. This makes it possible to control the fuel injection rate with good response and high accuracy following load fluctuation, achieve improved combustion, and hold a fuel injection period within an optimum angle range.

Abstract: Large work vehicles include hydraulic implement control systems having an hydraulic pump being driven by an internal combustion engine. The subject invention provides a method and apparatus for controlling such an hydraulic system to control engine lug while the hydraulic system is operating. The apparatus includes one or more sensors for producing parameter signals in response to the level of one or more hydraulic system operating parameters. A control receives the parameter signals and responsively produces a supplemental control signal which is used to control engine lug.

Abstract: The present invention provides a very simple structure to delay high fuel delivery to a turbocharged engine until a sufficient turbocharger boost pressure is available for adequate combustion, by providing a simple dashpot to limit movement of the throttle shaft. A brea-away throttle lever is used so that the operator can position the control lever at any position, even though the position of the throttle shaft itself is being limited by the dashpot. Preferably, the damping structure is entirely housed within the fuel injector pump, where it will be safe from debris, and constantly flushed with clean fuel.

Abstract: A hydraulic-controlled electronic governor employed in a fuel injection system is provided with a proportional pressure-reducing solenoid valve (10) capable of conducting a self-regulation of an input hydraulic pressure supplied from a hydraulic pressure source (30). Such pressure-reducing solenoid valve (10) is connected with a control rack (25) for controlling an amount of fuel injection, while interposed between the hydraulic pressure source (30) and a pressure input chamber (28) of a power piston/cylinder mechanism (22) for controlling the control rack (25), so that the input hydraulic force acting on one side of the piston (24) of the power piston/cylinder mechanism (22) balances the resilient force of a return spring (27) acting on the other side of such piston (24) so as to control the control rack (25) in its position.

Abstract: The invention is based on a fuel injection pump in which an adjuster, which may also be an injection onset adjuster, is actuated via an adjusting mechanism, and the adjusting mechanism has an adjusting piston, which is displaceable in a cylinder and is adjustable counter to a restoring force by a pressure fluid. The delivery of pressure fluid to the adjusting piston is controlled via electric valves, making a graduated, geometrically defined adjustment of the adjusting piston possible, but no feedback sensors for the actual status of the adjusting mechanism at a given time are required.

Abstract: The invention is based on a fuel injection pump having an adjuster, actuatable via an adjusting mechanism; the adjusting mechanism has an adjusting piston which is displaceable in a cylinder and is adjustable counter to a restoring force by a pressure fluid. The delivery of pressure fluid to the adjusting piston is controlled via electric valves, and by means of various geometrically defined adjusting piston positions, exact injection adjustment is possible without requiring technically complicated feedback sensors on the adjuster.

Abstract: The governor of the invention consists of an output solenoid having a plunger operatively connected to the mechanism to be controlled. The output solenoid is a "bang-bang" type such that full power or no power is delivered to the solenoid even for small errors between the desired operating condition and actual condition of the mechanism to be controlled. The output solenoid is connected in a hydraulic circuit with a control solenoid having a control valve such that the movement of the fluid through this circuit is regulated by the control solenoid. The control solenoid is of the proportional type such that the control valve's position is directly related to the difference between the actual operating condition and the desired operating condition of the mechanism to be controlled.

Abstract: In a construction machine having an engine speed setting device, a throttle lever for instructing a set number of revolutions to the engine speed setting device, and plural operating levers each for instructing the operation of an actuator, an engine speed controlling system including a lever neutral detector for detecting a neutral condition of the operating levers and outputting a lever neutral signal. A positive action switch outputs a deceleration command signal when operated by an operator. A control device outputs to the engine speed setting device either a normal operation command at the set number of revolution provided by the throttle lever or a deceleration command at a small number of revolutions in accordance with the signals provided from the lever neutral detector and the switch.

Abstract: A servocylinder unit for adjusting an amount of fuel fed to a vehicle drive engine and comprising a piston displaceable in a cylinder, a first pre-stressed spring for biasing the piston to its initial position, a first stop for supporting the first spring and displaceable along the longitudinal axis of the cylinder, a second pre-stressed spring extending between the first stop and a base of the cylinder, and a second stop fixed to the cylinder and engageable by the first stop under bias of the second spring. The first spring enables regulation of a number of revolutions of the vehicle engine, and the second spring, which has a larger pre-stress than the first spring and is less rigid than the first spring, is compressible to enable switching off of fuel feeding.

Abstract: An engine protection device which has a valve assembly supplying engine oil to an hydraulic cylinder which in turn is attached to the throttle of an internal combustion engine or governor of a stationary engine. If the oil pressure drops below a predetermined level, a sensor in the valve unit will cause the oil to drain from the hydraulic cylinder so as to slow down or stop the operation of the engine. In addition to using the oil of the engine itself, air or gas can also be used.

Abstract: The lever (13) cooperates on the one hand with a rotatable part (12) and, on the other, is coupled with a to-and-fro movable adjusting member (14). The lever (13) consists of a housing (15) traversed by the rotatable part (12), of a piston-like spring plate (16) and of a return spring (19) clamped-in between housing (15) and sping plate (16). Spring plate (16) and rotatable part (12) form in the mutually cooperating area a torque-limiting driving device. The hollow space (25) underneath the spring plate (16) is adapted to be acted upon with oil pressure by bores (21, 22) in the rotatable part (12) which are controllably connected to a pressure oil source (24). The oil pressure displaces the spring plate (16) so that the driving device is disengaged. The lever (13) is then displaced by the spring (27) of the to-and-fro movable part into an end position independently of the position of the rotatable part (12) which corresponds to the zero delivery of the fuel injection pump (11).

Abstract: A method of controlling the quantity of intake air being supplied to an internal combustion engine equipped with means for increasing the intake air quantity by a required amount in response to operating conditions of the engine. The intake air quantity increasing means is actuated for a limited period of time to increase the quantity of intake air when it is determined that a predetermined condition is satisfied for terminating interruption of the fuel supply to the engine, which is carried out at deceleration of the engine. Preferably, the intake air quantity increasing means is actuated when the rate of decrease in the rotational speed of the engine is larger than a predetermined value, while the predetermined condition is determined to be satisfied.

Abstract: An excavator has a number of different hydraulically powered functions that are controlled by a closed center hydraulic system that features a pair of variable displacement, engine driven hydraulic pumps, the displacement of which is responsive to the demands of the system. The flow to the various hydraulic motors is controlled by pilot operated load sensing control valves that direct fluid pressure to a load sensing line when one of the hydraulic motors in the system is being operated. The load sensing line is connected to the control system of the pumps to place the pumps in stroke when a flow of pressurized fluid is required. The flow of the load sensing pressure to the controls for one of the pumps can be optionally disconnected to place said pump in a standby condition and thereby reduce the flow capacity of the hydraulic system at the option of the operator.

Abstract: The present invention is concerned with an apparatus for controlling an engine mounted on a wheeled type construction machine. This engine controlling apparatus is adapted to set first and second torque performances conformable to a time of working of the wheeled type construction machine and a time of moving of the same and control an output torque of the engine in accordance with the aforesaid first and second torque performances at a time of working and a time of moving. Accordingly, by employing this controlling apparatus, working ability and moving ability of the wheeled type construction machine can be improved compaired with conventional apparatuses which control the engine on the basis of a single kind of torque performance.

Abstract: An inertia governor mechanism applicable to a power unit providing a uniform preselected RPM when the power unit is subjected to variable loads. A pump means provides a constant supply of fluid at a constant pressure to a fluid circuit. A rotary disc valve in the circuit, having one or more axial openings therethrough and driven by the power unit to be regulated, varies the pressure of the fluid in the circuit inversely proportional to the speed, to provide a regulatory fluid pressure which acts on an expandable actuating cylinder to regulate the power unit with a constant speed.

Abstract: A governor (11) for providing at least two different regulation factors for an internal combustion engine (10) including a fuel injection system (12). The governor (11) includes a rotatable flyweight assembly (18,20,22) adapted to be mechanically connected (24) to the engine (10) to be driven thereby. A first spring (28) may be compressed by the flyweight assembly (18,20,22) proportional to engine speed. The flyweight assembly (18,20,22) is adapted to be connected to the engine fuel injection system (12) by a rack (14) and a control level (34) abuts the first spring (28), in opposition to the flyweight assembly (18,20,22). The governor (11) includes a second compressible spring (70) along with an actuator (56,58) for selectively engaging and disengaging the control lever (34).

Abstract: An engine of a construction vehicle is controlled by a system which includes an engine control operation transmitting mechanism having a loose spring means and connecting a fuel control lever and a governor control lever; a decelerator cylinder accommodating a piston therein and having a spring for biasing always the piston on the opposite side of a pressure chamber defined thereby and on the side of the spring a piston rod connected through a york having an elongated hole formed therein to said transmitting mechanism; a solenoid valve adapted to supply the fluid under pressure delivered by a hydraulic pump driven by the engine for exclusive use in control of the system into the pressure chamber of the decelerator cylinder, and cut off the fluid supply; and an electric circuit for controlling the solenoid valve.

Abstract: A method of controlling an output of an internal combustion engine having an electronic governor device and/or that of at least one variable displacement hydraulic pump driven by the engine in which, when the engine is operated in a range of high speed revolutions approximately equal to or exceeding the number of revolutions of the engine at a rated point on a governor control curve specific to the engine, the engine is operated by the action of the electonic governor device at a given point of a curve of equal horsepower of the engine where an engine output torque is higher than that in the high speed revolution range and where fuel consumption is lower than that in the range.

Abstract: A fuel pumping apparatus for supplying fuel to an internal combustion engine includes a spring loaded fuel quantity control member which is moved by increasing fluid pressure in a chamber to reduce the amount of fuel supplied. The pressure in the chamber is controlled by a pair of ON/OFF valves, the first valve admitting fluid to the chamber and the second valve allowing fluid to escape from the chamber. When the valves are closed an hydraulic lock is created to prevent movement of the member by mechanical forces applied to it during operation of the apparatus.

Abstract: In a diesel for a hydraulic excavator or the like, the speed regulator of the injection pump is set by a lever which is pivoted by a piston-cylinder unit against the force of a return spring. Before or during operation under load, the piston-cylinder unit brings the setting lever to a preselected load position and, after terminating or interrupting operation under load, moves it to its idling position. At least one handle of the control levers for the hydraulically movable implements of the excavator is provided with a switch which, on first actuation, so operates a magnetic valve that the piston cylinder unit or the return spring moves the setting lever to the load position and, on being actuated again, returns the setting lever to the idling position.

Abstract: An apparatus for controlling the engine of a hydraulically driven vehicle includes a transmission mechanism having a loose spring and connecting a fuel control lever operationally to a governor control lever, a decelerator cylinder including a spring having a slightly larger spring force than the loose spring and disposed on the opposite side of a piston from a hydraulic fluid chamber and a piston rod connected to the transmission mechanism by a yoke having a slot, an electromagnetic valve for supplying a hydraulic fluid from a hydraulic pump driven by the engine to the hydraulic fluid chamber in the decelerator cylinder or interrupting its supply, and an electric circuit for opening or closing the electromagnetic valve.

Abstract: An adjustable hydraulically operated stop for pulsed loading is proposed, which is particularly applicable for the metering piston of a fuel injection system. The stroke of this metering piston can be varied by adjusting a stop body by means of a metering converter. The supply chamber communicating with a fuel source or with the pump work chamber of one of the pump/nozzles of the fuel injection system, whose size is dependent on the stroke of the metering piston, determines the injected fuel quantity. The adjustable hydraulically operated stop encompasses a mechanical stop body, which is movably supported with respect to its adjusting member embodied by a sheath and communicates therewith via fluid, which also surrounds the adjusting member.

Abstract: A fuel flow regulation device for a supercharged engine of the type having an injection pump whose piston's bottom position is determined by a moving stop, is disclosed. The fuel flow regulation device consists of a tridimensional cam contacting the stop and movable in an axial and a rotational direction. The axial movement of the cam is provided by a piston rod connected to a pair of pistons, one of which has a smaller diameter than the other by a predetermined amount, in which the pistons are oppositely subjected to engine intake pressure and engine exhaust pressure. The rotational movement of the cam is controlled by a jack subject to the output of a volumetric hydraulic pump actuated by the engine and pumping fluid from the engine cooling system.

Abstract: A device for regulating a diesel motor driven feed pump which includes an injection pump associated with the diesel motor to control its operating speed, comprises a load, a variable pressure resistance connected by a feed line in series in series to the feed pump and a sump for the feed pump connected to the pressure resistance. In addition a control circuit is connected to the feed line and it includes a pressure scale portion and a limiting device portion each of which includes a respective pressure scale cylinder and limiting device cylinder portion for their respective coaxially arranged pressure scale piston and limiting piston slidable therein. A differential manometer is connected between the pressure scale portion and the limiting portion and it is admitted with the flow medium of respective differential pressures of the associated cylinders of these portions.

Abstract: In an internal combustion engine equipped with a fuel injection pump which has a movable fuel amount determining element, the position of which determines the amount of fuel provided for injection by the fuel injection pump, a pressure regulating valve is disclosed which is coupled to the movement of the movable fuel amount determining element and which provides an output fluid pressure which represents the position of this element, and therefore represents the load on the engine. The valve comprises a fixed orifice supplied with a constant fluid pressure, a fluid passage downstream of the fixed orifice, a pressure takeoff passage branching from the fluid passage, and a variable orifice downstream of the fluid passage whose effective opening area is varied according to the movement of the fuel amount determining element.

Abstract: In an rpm limit shut-off regulation effected by a piston which is displaceable by the rpm-dependent pressure of a regulator fluid and which limits the injection quantity, it is proposed to influence the shut-off curve via a pressure roller which engages a contact surface of the piston. The shut-off curve can be selected to be steeper or flatter over the entire range or a partial range. However, without requiring additional means, the full-load injection quantity can also be influenced in accordance with the rpm. To this end, rapidly rotating parts with necessarily resulting high wear are not required.

Abstract: An electronically controlled, hydraulically actuated precision governor controls the operating RPM of an internal combustion engine by repositioning the engine throttle in response to changes in engine RPM. The piston of a hydraulic actuator is coupled to the throttle. The flow of hydraulic fluid to the actuator is controlled by a specially designed hydraulic valve which includes a piston the displacement of which is regulated by controlling the pressure in a pressurized control chamber. The fluid pressure in the pressurized control chamber is regulated by a pair of electronically controlled fuel injector nozzles. The electronic circuitry which controls the two electronic fuel injector nozzles receives electronic inputs corresponding to the operating RPM of the engine, the desired engine operating RPM and engine throttle position.

Abstract: An internal combustion engine is provided with a device for automatically preventing thermal and mechanical stress during overload periods, and to power the engine with the most economical fuel consumption rate possible. In a preferred embodiment, the device is associated with the variable speed governor of the main diesel engine of a ship. The device includes a system actuated by significant movements of the governor to regulate the fuel pump or pumps or reduce the engine speed to a more economical and safe level. Means for overriding the system in emergency situations may be provided.