Showing papers on "Prime mover published in 1990"

Stirling cycle heat pump for heating and/or cooling systems

Abstract: Stirling cycle heat engine adapted for use as space heating and/or air conditioners. One embodiment features a Stirling engine prime mover providing a hybrid Stirling machine. Another embodiment utilizes an electric drive motor as a prime mover and a final embodiment is an open drive Stirling thermal engine particularly adapted for automotive belt driven applications. Enhancements in performance are provided by using pressure ratios significantly lower than that ordinarily provided for Stirling cycle engines. Decreases in pressure ratios are provided by intentionally adding dead volume to the cycle and particularly adding this dead volume strategically in the regenerator of the device which has been found to provide performance benefits. The systems according to this invention can be used either as space heaters or air conditioners by appropriately directing heat absorbed and rejected from the heat exchangers of the device to the approrpriate environment.

Engine driven heat pump with auxiliary generator

Abstract: The heating and cooling of structures is accomplished by driving a compressor of an air conditioning system with an internal combustion engine. The engine also drives an electrical generator to provide electrical power to the various components of the heating and cooling subsystem such as fans, motors, pumps, and controls. A constantly variable transmission apparatus and a differential power transmission are cooperatively connected to the engine to provide substantially constant speed operation of the generator.

Apparatus with a throttle device determining the output of a prime mover

Abstract: A throttle valve apparatus, including a throttle valve shaft that is actuated in an axial direction with the aid of a magnet toward a housing stop. The magnet is necessary in any case to actuate a clutch. The location of the throttle valve shaft is defined exactly and without play, without requiring a separate component for this purpose.

Well pumping systems

Abstract: The present invention provides a method and apparatus for eliminating at least a portion of the energy losses in a well pumping system which are due to "regeneration" (i.e. those periods during the pumping cycle in which the pumping system experiences negative net torque). This is accomplished by positioning a clutch means in the driving connection between the prime mover and the pumping unit of the well pumping system so that the clutch means forms a driving connection between said prime mover and said pumping unit during periods when said pumping unit experiences positive net torque and effectively disengages the driving connection between said prime mover and said pumping unit to allow freewheeling therebetween during periods when said pumping unit experiences negative net torque.

Propeller unit with controlled cyclic and collective blade pitch

Abstract: An improved integral marine propulsion unit is disclosed that can generate a thrust vector in any of three degrees of motion. The unit utilizes both collective and cyclic propeller blade pitch angle variation to generate these thrust. This unit obviates the need for control surfaces and rudders for motion control of a marine vessel. Additionally, this unit provides flexibility in external propulsor arrangements on a marine hull. The unit integrates the swash plate mechanism and actuators within the central bore of a ring type prime mover.

Compact power supply with gas engine

Abstract: A compact portable power supply including an internal combustion engine that drives a generator and which engine is fueled by a pressurized source of gaseous fuel. The outer housing and control structure is configured in such a way that the source of gaseous fuel will always be oriented so that liquid fuel will not be delivered to the engine when the power supply is in use.

Air-cycle air conditioning system

Abstract: An air-cycle air conditioning system comprises a first turbine disposed in an exhaust passage of a prime mover and driven by the energy of exhaust gases, a first compressor placed in coaxial relation to the first turbine and rotatable in response to the operation of the first turbine so as to intake and compress an air, a second turbine coupled to an outlet end of the first compressor through a first line and rotatable by the energy of a compressed air from the first compressor so as to expand and cool the compressed air, a first heat exchanger disposed in the first line and effecting heat exchange between the compressed air and an outside air, a second heat exchanger connected to the second turbine through a second line and effecting heat exchange between the air supplied from the second turbine and an air supplied from a fan, a second compressor placed in coaxial relation to the second turbine and rotatable in response to the operation of the second turbine so as to intake and compress an air, an auxiliary burner capable of burning the air supplied from the second compressor and feeding the resultant exhaust gases to the first turbine, a load sensor for detecting load condition of the prime mover, and a controller for permitting the auxiliary burner to feed the exhaust gases to the first turbine when the load sensor detects that the prime mover runs on low load.

Stepless hydrostatic-mechanical transmission

Abstract: A stepless hydrostatic mechanical transmission between a prime mover and a power output train in which an epicyclic differential is incorporated in the transmission and includes at least four shafts, a large and a small sun wheel, two planet wheels in mesh with the sun wheels, a web supporting the planet wheels and an annulus. Two main shafts constituting input and output shafts are connected with respectively different shafts of the epicyclic differential. Two hydrostatic machines are connected to the epicyclic differential such that in at least one working range of the power transmission the hydrostatic machines are adapted to be connected to the epicyclic differential and operated as pumps and motors. The operation of at least one of the hydrostatic machines is changed over by a clutch, when the other hydrostatic machine is stationary and during transition from one working range to another, from connection with the output shaft to the small sun wheel and, during traction operation, from the motor function to the pump function. In the epicyclic differential, the large sun wheel is driven by the input shaft and is located between the small sun wheel and the prime mover.

Apparatus for controlling revolution speed of prime mover for hydraulically propelled work vehicle

Abstract: A prime mover revolution speed control system for a hydraulically propelled vehicle controls the revolution speed of a prime mover to optimize vehicle acceleration in a vehicle propelling mode, and to optimize engine output and economy in a working mode. A vehicle equipped with the control system may include a hydraulic pump for discharging hydraulic fluid, the amount of fluid discharged depending on the revolution speed of the prime mover, a hydraulic motor for vehicle propulsion that is driven by hydraulic fluid discharged from the hydraulic pump, and an actuator for performing work that is also driven by hydraulic fluid discharged from the hydraulic pump. The revolution speed of the prime mover may be controlled according to a depression amount of a revolution speed control pedal. When the control system is in the working mode, the revolution speed of the prime mover is controlled in accordance with revolution speed characteristics suitable for a working operation. When the control system is in the vehicle propelling mode, the revolution speed of the engine is controlled in accordance with revolution speed characteristics suitable for a vehicle propelling operation.

Gas turbine engine drive system

Abstract: In a gas turbine engine system the gas turbine (1) acts as a prime mover and includes an electrical generator/motor (2) in driving connection with the rotor (13) of the turbine. The generator supplies energy storage means (12 or 27) and control means (11) controls the operation of the system according to the power demand and the rate of increase of the power demand. The system allows for more rapid acceleration and rapid increase in the power demand.

Controller for non-linear position servo

Abstract: A servo control system (100) for controlling a prime mover (16) to position a load (12) to a commanded position in accordance with the invention includes a position sensor (14) for providing a load position signal representative of a position of the load; a controller for producing a control signal controlling activation of the prime mover to cause the load to be positioned at the commanded position including a first summer (20) for producing a first difference signal equal to a difference between a position command specifying the commanded position and the load position signal which is applied to a proportional amplifier (22) and an integrator (24), a second summer (26) for producing a sum of outputs from the proportional amplifier and the integrator and a third summer (104) for producing the control signal which is equal to a difference between the sum of the outputs and a signal proportional to the load position signal.

Predictors for application to real-time adaptive control of a diesel prime-mover

Abstract: Adaptive control of a power prime-mover requires effective modeling and identification techniques that have good disturbance rejection properties. Existing methods tend to avoid explicit modeling of input dead-time due to resulting computational complexity. Two different approaches of modeling the diesel power prime-mover are presented. The predictors are derived from the results of two different least-squares estimates of the plant. The derived predictors are compared with each other, and with their respective least-squares models, on the basis of disturbance rejection capability and computational complexity. It is shown by extensive simulation studies that the predictors obtained converge quickly and operate with very small prediction error under severe load disturbances and large speed reference changes. A comparative discussion of the two methods is presented. >

Rotary engine with rolling pistons

Abstract: The rotary rolling-piston engine including two types of external and internal combustion, can be used as a prime mover. Its basic structure comprises: a rotor in elliptic cylinder, at two sides of the rotor, two symmetrical pits are engaged with two pistons and power output is delivered by a main shaft at the center of the rotor. With no reciprocating mass of connecting rod crankshaft system and valve-actuating mechanism, and no restriction on variable angular-rate movement, the expansion process can be converted directly into rotary movement, and there are two expansion processes for each revolution, so that higher speed and better performance can be achieved. For the external combustion engine, any fuel can be used for indirectly heating the working medium, thus having higher effective efficiency and lower exhaust pollution.

Power working machine

Abstract: A power working machine having a main body case in which a prime mover is housed, a front handle and a rear handle which handles are gripped by the operator. The front handle has a flat cross-sectional shape reduced in thickness in a direction in which the front handle faces the main body case while being increased in width generally in the longitudinal direction of the machine body.

Method and device for water wire sawing

Abstract: PURPOSE:To easily cut a cutting object from water without rupturing a cutting wire even if a base vessel is rocked by operating a wire driver on the base vessel and driving via a cushion pulley the cutting wire spread on the wire driver and cutting object. CONSTITUTION:When a wire driver 5 is operated by a prime mover 9, a driving pulley 8 is rotated, a truck 7 is moved to the front part as well and a cutting wire 25 travels by circulation under the necessary tension, so a cutting object 1 is gradually out. When a base vessel 3 is rocked upward, the cutting wire 25 is tightened, the pressure adjusting valves 17, 18 of each air pressure cylinder 13, 14 are opened when the tension thereof reaches the limited set value, a rod 23 is contracted in a pneumatic cylinder 13 of the front part and a cushion pulley 21 is displaced in the head direction as shown by a dashed line as well, simultaneously a rod 24 is stretched in the pneumatic cylinder 14 of the rear part, the cushion pulley 21 is displaced in the head direction as well, simultaneously a cushion pulley 22 is displaced in the reverse direction and the tension of the wire 25 is eased.

Linear motor type prime mover for cableway

Abstract: PURPOSE:To correct a floating displacement nearby the circumferential edge of a prime moving pulley so as to prevent the generation of vibration and noise by keeping a required gap between the secondary side conductor of a linear motor for driving the prime moving pulley and the first side stator by a posture correcting device. CONSTITUTION:A prime moving pulley 1 is rotated round an axis by the thrust of a linear motor 10 to drive a cable 5 wound on the circumferential edge 3 for operating a cable equipment. Gaps 13a, 13b between the first side stator 11a..., 11b... and the secondary side conductors 12a, 12b of the linear motor 10 is kept constant by guiding rollers 24a..., 24b... pivoted to the shaft pins 23a, 23b of a posture connection device with rolling and touching to the rolling faces 6a, 6b of the prime moving pulley 1. Like this way, the required valve of the important gap of the linear motor drive is accurately kept so that vibration and noise reduction can be achieved without the floating rotation.

Continuously variable transmission

Abstract: PURPOSE:To permit the continuous speed change by a pure mechanical gear mechanism by permitting the turning moment to be offset by the meshing of an outer peripheral side gear with the internal gear of a both planetary gear mechanism for dividing the power of an input shaft and reversely setting the revolution direction of the both output shafts by connecting an electric motor for control with one and connecting the other output shaft with the sun gear of the third planetary gear mechanism and taking out the power onto one output shaft CONSTITUTION:An input shaft 1 is connected with the input shafts 5 and 5' of the planetary gear mechanisms 20 and 20' through gears 3, 4, and 4', and the power is divided into two parts and inputted into sun gears 6 and 6' Then, the gear 9 of a prime mover 11 for control is meshed with the gear 8 of the mechanism 20, and the torque is made equal, and then each number of revolution of the output shafts 13 and 13' is increased/decreased according to the number of revolution of internal gears 7 and 7' Then, a gear 16 is fixed onto the shaft 13', and after a reversing machine 40 is interposed, a gear 21 is fixed onto the shaft 13, and meshed with a gear 18, and then a gear 22 receives a force in an equal quantity from the gears 16 and 17, and the turning moments of the shafts 13 and 13' are integrated and transmitted to the output shaft Therefore, when the number of revolution of the prime mover 11 varies, the power of the input shaft 1 is speed-changed in continuous form for the output shaft 2

Prime mover speed control device of construction machine

Abstract: PURPOSE:To realize the simplification of structure in the whole device and the simplification of operation by feeding the driving signal from an up and down instruction operating device to a driving device through a signal delivery device, so as to drive a prime mover output control device CONSTITUTION:While the output of a prime mover 1 is controlled by a device 1a, the device 1a is driven by a device 3 On the other hand, an up/down instruction operating device 6 to output the up signal and the down signal at respective positions as well as to operate the rotation speed of the prime mover to the up position and to the down position is provided And a signal detecting device 101 to feed the driving signal to a driving device 3 so as to raise and drop the rotation speed of the prime mover 1 by the up and the down signal is provided And when the rotation speed up and down of the prime mover 1 is instructed by the operation of the device 6, the driving signal responding to the instruction is fed to the device 3 through the device 101, and the rotation speed of the prime mover 1 is increased or decreased through the device 1a

Integral control device for reducing speed change shock in power

Abstract: PURPOSE:To positively prevent the occurrence of speed change shock resulted from erroneous learning, and thereby assume proper control in line pressure at all times by prohibiting learning control in line pressure during the shifting operation of an automatic transmission when the output torque of a prime mover is changed. CONSTITUTION:An automatic transmission B connected with an engine A selects a specified each step of gear shifting by letting every kind of frictional element C of a speed change gear mechanism be hydraulically actuated selectively by line pressure D. And the line pressure D during the shifting operation of the automatic transmission B is controlled in learning by a means E in such a way that the actually measured time of inertia phase time is consistent with a target value. And the output torque of the engine A during the shifting operation is changed by a means F. In the constitution set forth herein above, a change in output torque by the means F is detected by a means G. And when the change in output torque is detected, the learning control in line pressure assumed by the means E is prohibited by a means H.

Safety device for work truck

Abstract: PURPOSE:To contrive the improvement of safety by providing a sensor which detects an operator not to be present in a driving position in a drive handle part stopping running of a truck body, in the case of a truck whose body is driven and steered by a drive handle behind the truck body. CONSTITUTION:In case of the invention being applied to a snowplow truck which mounts onto an under carriage, having a running gear 5, a prime mover so as to drive by its power a snowrake auger 8 provided in the front part of a truck body 1 and a snow lifting fan 9 springing up snow, raked in by the auger 8, toward a release cylinder 10, a sensor 3 is provided in a control panel 18 in the front part of a drive handle 2 provided behind the truck body 1. This sensor 3 is formed by combining a light emitting element with a light receiving element, serving as the photosensor directed toward the rear, and an operator can be detected to disappear in a driving position in the drive handle part 2. And being based on a detecting result of this sensor 3, a power unit of the prime mover is cut off so as to perform an emergency stop of running.

Propelling system for ship

Abstract: PURPOSE:To make a prime mover miniature and lighten by constituting the prime mover for rotating an underwater rotary wing with a superconductive electromagnetic propelling device or a superconductive electric propelling device of which power is supplied by a high temperature type solid electrolyte fuel sell. CONSTITUTION:A liquid helium reserving vessel 27 helium refrigerating and liquefying machine 24 storing liquefied helium manufactured via a heat exchanger 25 is provided, in an LNG ship equipped with plural number of LNG tanks 21. Moreover, the ship is equipped with a high temperature type solid electrolyte fuel cell 31 generating dc electric current by reaction of ordinary temperature natural gas cold recovered and high temperature oxidizer (air and the like), and dc electric current generated here is applied to a superconductive magnet 43 to generate a magnetic field in sea water. Further, a plus side electrode 45 an a minus side electrode 46 are set up in sea water, and propelling force designated with a fat arrow mark in the figure is obtained by leading dc electric current to them, according to the Lorentz's lefthand rule. The superconductive magnet 43 is housed into a liquid helium vessel 40 and kept in a cooled state.

Co-generation plant

Abstract: PURPOSE:To improve a plant availability factor, in a plant in which exhaust heat of a power generating plant is utilized as a heat source of air-conditioning, hot water supply and the like, by providing such a constitution that a bleeder condensing turbine is used for the prime mover of a power generator, and the turbine bleed is supplied as the heat source of an absorption refrigerating machine. CONSTITUTION:A power generator 1 is arranged to be driven by a bleeder condensing turbine 2, and turbine bleed 3 is utilized as heat source of the concentrator 4a of an absorption refrigerating machine 4, while output cooling water 5 of the absorption refrigerating machine 4 is delivered to a turbine condenser 6. The bleeder condensing turbine 2 is driven by means of the recovery steam of an exhaust heat boiler 9 which utilizes exhaust gas of a gas turbine 7 for driving a main power generator 8. In the absorption refrigerating machine 4, an absorber 4d and a condenser 4b are forced to make heat radiation and cooling by circulating outside cooling water 20, 20', so that the cooling water is heated by itself to be utilized as hot water, while, cooling water 19 for air conditioning can be extracted from an evaporator 4c.

Device for controlling revolution speed of prime mover for hydraulic construction machine

Abstract: PURPOSE:To prevent noises and to improve fuel consumption by discerning traveling mode and work-handling mode of a hydraulically operated car by signaling means, and by controlling the revolution speed of a prime mover to each of revolution speed characteristics required respectively by the traveling mode and by the work-handling mode. CONSTITUTION:An oil-hydraulic pump 1, an oil-hydraulic motor 4 for traveling and an actuator 52 for work-handling are connected to a controller 33 controlling the revolution speed of a prime mover so that operation of a travel pedal 6a can be changed to one under maximum revolution speed characteristics of the prime mover 21 in accordance with the degree of operation of the pedal. By means of a detecting device 37 detecting the degree of operation of the travel pedal 6a, signaling means 35 and 36 showing traveling mode and work-handling mode and the controller 33, the degree of operation of the pedal 6a and the revolution speed of the prime mover 21 are respectively sorted out to meet the revolution speed characteristics required by each of the traveling and the work-handling modes and are set therefor. Thereby a car can select revolution speed characteristics respectively for the traveling mode and for the work-handling mode, and the revolution speed of the prime mover 21 can be controlled by the degree of operation of the travel pedal 6a.

Synthetic controller for power train

Abstract: PURPOSE:To suppress the new generation of speed change shock due to the excessive increase of the torque reduction of a prime mover by suspending the operation of a torque down means when an accelerator pedal is operated in the reduction direction during speed change. CONSTITUTION:An automatic transmission 2 selects a prescribed speed change stage from the selective hydraulic operation of each frictional element, and transmits the power of an engine 1 which is adjusted by an accelerator pedal with the gear ratio corresponding to the selected speed change stage. During the speed change in which the automatic transmission 2 selects the selected speed change stage, a torque down means lowers the output torque of the engine 1 and lightens the speed change shock. At this time, an accelerator return detecting circuit 23 detects the return operation of the accelerator pedal in the speed change on the basis of the throttle opening degree information supplied from a throttle opening degree sensor 9 and the speed change signal supplied from a speed change determining circuit 16, the torque reduction control for lightening the speed change shock is prohibited by suspending the operation of a torque down means. Therefore, the cause of the new generation of the speed change shock can be removed.

Velocity Control of a Manipulator Joint Driven Through a Worm Gear Transmission

Abstract: The design of an individual joint of a robot manipulator typically includes some form of transmission between the prime mover and the joint itself. From a geometric point of view, employing a worm gearset can, in many situations, be a desirable way to realize this function. However, for some robot configurations, the manipulator and the worm gearset give rise to unstable behavior characterized by a growing oscillatory motion. A stabilizing controller for this type of system is necessary. Presented here is a synopsis of such a feedback control design which achieves stabilization. The system differential equations are linearized about a desired trajectory and averaged to obtain a set of linear time invariant equations. These linearized equations are then used as the plant-model for controller synthesis. The design synthesis is accomplished by classical lead-lag compensation. In a physical experiment, velocity feedback from the motor tachometer and digital control are used to implement and verify the control schemes.

Commodity lift device for automatic vending machine

Abstract: PURPOSE:To simplify the constitution of the rising or falling of a commodity mounting stage and to facilitate the maintenance of a prime mover by connecting freely and selectively the mounting stage to the rising or falling side of an endless belt which is driven only in one way by a connection means and therefore moving up and down the mounting stage without revolving the prime mover forward and reversely. CONSTITUTION:An endless belt 5 having the hook projecting parts (a) formed with the necessary pitch is driven only in one way by a prime mover set at a lower position. Then a joint part 11A or 11B of a connection device A which is controlled by an actuator like a solenoid 12 of a commodity mounting stage 3, etc., interlocks the parts (a) of the rise or fall side of the belt 5. Thus the rise and the fall of the stage 3 are controlled with no forward or reverse revolution of the prime mover. As a result, the constitution of the lift device is simplified and at the same time the maintenance of the prime mover is facilitated.

Multiple accessory drive gearbox with alternative inputs

Abstract: A gearbox to drive six accessory units from a vehicle prime mover or alternatively from an auxiliary engine. A continuously variable ratio unit in the drive line from the prime mover provides a constant speed at a first input to the power transmission gears over the operating range of the prime mover. The auxiliary engine operates at a constant speed, driving a second input to the gearbox and by-passing the variable ratio unit to drive the accessories at the same constant speed as that provided by the prime mover. Over-running clutches permit the change-over to drive from one power unit to the other to take place while both are in operation.

Control method for binary generator

Abstract: PURPOSE: To ensure a stable power control range by combining generator load with the self-load as a base load at the beginning of a power generation, and controlling the power generation in a range of 0-100% of the self-load. CONSTITUTION: Assuming a demand load (max. output) to be 455kW, a house usage of 104.6kW is about 23% of the demand load. The house usage is used as self-load for the generator load, so that the self-load may be considered an uncontrolled base load. In the power facility, therefore, the prime mover 4 of a generator is controlled within the excess of 23 to 100%, by which the base load is exceeded. COPYRIGHT: (C)1991,JPO&Japio