Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1986-07-07
1988-10-25
Argenbright, Tony M.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123339, 123357, F02D 2900, F02D 4100
Patent
active
047795913
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a speed setting device for setting the speed of a working machine and more particularly, for setting the speed in an excavator.
A diesel engine normally has a regulator for controlling, via a lever on the fuel injection pump, the amount of fuel supplied to the combustion chamber of the engine, to drive the engine at a predetermined speed. In an excavator, the engine usually is placed in the rear part of the hinged machine frame, and the above-mentioned speed control can be actuated manually and variably from the driver's seat by use of a hand-wheel, as well as by use of a pushbutton on the control lever, said hand-wheel and said push-button being adapted, via an electromechanical control system, to control the movement to the lever on the fuel injection pump.
During the excavating work, the engine should operate at a speed suitable for the type of work. Before or during excavation, the operator can set, for instance by use of the hand-wheel, an initial speed which, together with the speed control device, provides an operating speed suitable for the work. As soon as the operator actuates his controls to carry out excavation, the engine speed is increased automatically from resting speed to working speed. If required, the device permits manual stepwise increase/decrease of the engine speed during work and automatic return to resting speed when no work is carried out.
DESCRIPTION OF THE PRIOR ART
A prior art device for the above-mentioned speed control, Swedish Pat. No. 74 00 846-7, comprises a hydromechanical control means connected to the operating system of the work unit of the machine, where the system actuates the lever of the fuel injection pump. In this arrangement, the automatic engine control varies between a variably settable resting speed and the racing speed. This arrangement was intended to reduce automatically the engine speed when no excavating movement takes place, and to increase the motor speed when excavation is carried out. In this manner, fuel consumption is reduced and, at the same time, the direction of the high noise level period is also reduced. Other automatic idling systems in excavators utilise, in principle, a pneumatic cylinder, the piston rod of which is connected to the lever on the fuel injection pump of the engine. The cylinder is activated by means of a pressure control device in the hydraulic circuit, or by an electric switch on the control lever. These means provide for automatic control only between a resting speed/idling speed and a maximum speed.
SUMMARY OF THE INVENTION
The present invention affords completely different speed setting possibilities well suited to make excavation work more effective and to further minimise fuel consumption and to reduce the noise level of the machine. In addition, the present invention's electromechanical unit has few moving parts and may be readily adapted to different speed control patterns. The speed setting possibilities are realised by means of the arrangement as defined in the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will be described in more detail below, reference being had to the accompanying drawings illustrating an embodiment.
FIG. 1 provides, in the form of a block diagram, a basic functional description of the device, while
FIG. 2 describes the function in more detail. The manner in which the speed is varied by means of different factors is illustrated in FIGS. 3 and 4.
FIG. 5 shows possible engine speed settings.
DETAILED DESCRIPTION OF THE INVENTION
The speed setting device according to the invention, which has been designed for internal combustion engines, especially diesel engines, in earth-working machines, comprises a system which is actuated in a specific manner and sets the diesel engine speed by means of a d.c. servo motor, the output shaft of which is fixedly connected to the control lever of the fuel injection pump of the diesel engine. A basic functional description of the system is given in FIG. 1.
The system, and t
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patent: 4370961 (1983-02-01), Brown
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patent: 4373850 (1983-02-01), Durham
patent: 4422420 (1983-12-01), Cromas et al.
patent: 4638779 (1987-01-01), Kitada
patent: 4643146 (1987-02-01), Spriessler
Akermans Verkstad AB
Argenbright Tony M.
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