Internal-combustion engines – Engine speed regulator – Having condition responsive means with engine being part of...
Patent
1981-06-12
1983-10-18
Cuchlinski, Jr., William A.
Internal-combustion engines
Engine speed regulator
Having condition responsive means with engine being part of...
123501, 123502, F02D 104
Patent
active
044099410
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a control system for an internal combustion engine with fuel injection, comprising a mechanical centrifugal governor, the end support of whose spring mechanism is constructed to be axially movable.
A similar type of control system is described in Swiss Pat. No. 171,817. This known type of design does not include a rigid connection between the control device for the start of fuel injection and the device for adjusting the load of the governor, as for some engines it will be of advantage not to vary the timing of the beginning of injection in the lower speed ranges, or to set it at a slightly earlier point in time than a rigid coupling would do in order to ensure stable idling.
The object of the present invention is entirely different. In addition to the control of its load, the mechanical centrifugal governor is designed to control other functions and auxiliary devices of the internal combustion engine. For example, it can adjust the injection timing of the fuel injection pump or to control some complex process of adjustment. In such cases considerable additional activating forces will have to be supplied which the centrifugal governor cannot provide directly or which it can only generate after a considerable increase of its working capacity and thus of its dimensions and weight. Therefore servor mechanisms will have to be provided for operating these auxiliary assemblies of the internal combustion engine, which however will require a separate speed-dependent control signal.
Such signals are usually generated--e.g. in single piston fuels pumps--by using the fuel pump, whose output volume is determined by the engine speed, as a signal source. The pressure for a working piston is obtained by way of a reducing valve, the accuracy and working capacity of this control system being rather poor, however.
Another known method comprises the use of an additional speedometer, e.g., a mechanical centrifugal governor, which drives a hydraulic power amplifier. Although this set-up will guarantee a high degree of accuracy and its working capacity will depend on the dimensions of the power amplifier only, a considerable constructional effort is required in this case.
It is an object of the present invention to design a control system of the aforementioned type in such a way as to permit the derivation of additional speed-dependent signals from the centrifugal governor, without having to increase its dimensions and its weight.
The present invention achieves this first of all by means of a servomotor for auxiliary assemblies of the internal combustion engine, whose control mechanism is activated by the speed-dependent force of the spring mechanism which is exerted on the end support. The speed-dependent force fed into the spring mechanism by the flyweights of the governor is transmitted to the control mechanism of a servomotor. Thus the additional speed-dependent signal is derived from the centrifugal governor without affecting the proper function of the governor as a means for adjusting the regulating rods of the injection pumps and without reducing its service reliability.
According to a further aspect of the invention the movability of the end support can be limited to a very small range by means of stops or by the control mechanism itself. This will limit interference with the function of the governor, thereby increasing the operational safety of the entire control system even further.
In a preferred embodiment of the invention the spring mechanism of the mechanical centrifugal governor resembles that of a per se known idling and maximum speed governor, whose simple design is particularly well suited for the control system envisaged by the present invention. Further to the invention, the spring mechanism of the centrifugal governor, which is arranged in the end support, may contain an adapting device of a per se known type, which will eliminate the need for an additional adapting device driven by the servomotor.
Another version of the present invention suggests that the servomotor be driven by hy
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patent: 4109628 (1978-08-01), Miller et al.
patent: 4150650 (1979-04-01), Tsumura
patent: 4174694 (1979-11-01), Wessel et al.
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