Communications: electrical – Selective – Having indication or alarm
Patent
1982-12-07
1985-11-05
Myracle, Jerry W.
Communications: electrical
Selective
Having indication or alarm
34030915, 340522, B60Q 100
Patent
active
045517037
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a service interval signaling device for prime movers driving additional appliances by way of an output shaft, with a signal generator yielding a signal when a threshold value for a characteristic magnitude or operating parameter, such as engine operating hours for example, has been reached. The prime movers can be, for example, internal combustion engines or electric motors. Driven appliances can be, for example, compressors, heat pumps, automotive vehicles, or hydraulic installations.
In such a conventional signal device, the total number of operating hours is considered as a characteristic magnitude. However, no consideration is given to the actual load exerted on the prime mover. As a consequence, servicing is frequently performed much too early since the limit or threshold value for the characteristic magnitude or operating parameter, for example operating hours, must be dimensioned so that servicing is executed in time even under extreme loads on the prime mover. Otherwise, service would be performed too late in case of extremely stressed prime movers. This means unnecessarily high operating costs for the plurality of users or the prime movers. This procedure is likewise disadvantageous from the viewpoint of economy, since frequently parts must be exchanged for precautionary purposes even though such parts would still work perfectly for a certain operating period and thus could remain in the prime mover or in the driven appliances.
The invention is based on the object of providing a signaling device of the type discussed above which, in most cases, will draw attention to a necessary service only if indeed necessary.
This object has been attained by making the characteristic magnitude, operating parameter, dependent on the total number of revolutions of the output shaft or of another rotating part.
The invention makes it possible to adapt the service interval to the actual requirements. In case of a gentle operating mode, for example with avoidance of extreme numbers of revolutions, the service interval can be expanded to be longer than the interval employed in the case of considering the operating hours exclusively, or in case of a predominantly extreme stressing of the prime mover.
It is possible to utilize as the characteristic magnitude solely, or operating parameter, the total number of revolutions of the output shaft. In contrast thereto, an even further improved adaptation of the signal transmitted by the signal generator to the actual necessity of servicing is obtained if the characteristic magnitude is composed of the actual total number of revolutions and an additional component formed in correspondence with the load on the prime mover.
Consideration of the load can be effected in various ways. Thus, it is possible to introduce the additional component by addition in correspondence with such load. However, the additional component can be taken into account especially simply from the viewpoint of circuit technology and with great accuracy by multiplying the load in the form of a factor applied to the number of revolutions before recording thereof. Such a multiplication can be achieved, for example, by the introduction of input attenuators which are fed with pulses in correspondence with the revolutions and which are actuated, for example, in case of an extreme load on the prime mover so that evaluation of the number of revolutions takes place in correspondence with the load.
This factor can be introduced in various ways. Thus, it is possible, for example, to make the factor effective and/or ineffective only at an extreme value of an operating parameter. The factor can be activated and/or inactivated as long as the extreme value prevails, or alternatively until a given number of revolutions has been reached.
However, the factor can also be effective and/or ineffective only as long as the value of the operating parameter ranges above or below a predetermined limit value, respectively. In this case, the factor becomes effective also merely during an extreme load on the pr
REFERENCES:
patent: 2261770 (1941-11-01), Kusinitz
patent: 3603880 (1971-09-01), Brecker et al.
patent: 3903736 (1975-09-01), Bissett et al.
patent: 3925754 (1975-12-01), Ota et al.
patent: 4129037 (1978-12-01), Toalson
Bourauel Fritz
Weishaupt Walter
Bayerische Motoren Werke AG
Myracle Jerry W.
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