Internal-combustion engines – Accessories – Covers – trays – vibrators – corrosion inhibitors – air filters
Patent
1993-09-16
1995-07-04
Kamen, Noah P.
Internal-combustion engines
Accessories
Covers, trays, vibrators, corrosion inhibitors, air filters
290 40C, F02B 7700
Patent
active
054290821
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to a method and arrangement for operating a drive for a plurality of auxiliary devices arranged on an internal-combustion engine in a motor vehicle, having a differential gear arranged between the internal-combustion engine and the auxiliary devices.
In order to meet the current or voltage requirement of electrical consumers in a motor vehicle, a timed exciting current is fed to a rotary current generator. When there is, for example, a first low rotational generator speed, the exciting current is switched on and off by a regulator at predetermined intervals in such a manner that a specific first medium exciting current is adjusted in the case of a constant wiring voltage. So that the wiring voltage which is permissible for the wiring of the motor vehicle is regulated to its desired value when a second higher rotational generator speed occurs, the regulator changes the timing signal in such a manner that the switched-off time fractions increase and a second medium exciting current is adjusted which is lower than the first. As a result, the wiring voltage, which is a function of the exciting current and the rotational speed and is induced in the generator, remains constant.
It is known to arrange a transmission between an output of an internal-combustion engine and a drive of auxiliary devices. The transmission, as a function of parameters, carries out an adaptation of the rotational driving speed of the auxiliary devices to the rotational output speed of the internal-combustion engine. For example, in the German Patent Document DE-PS 31 24 102, a consumer-current-dependent change-over between a higher and a lower rotational driving speed of an electric generator is disclosed. The transmission connected in front of the electric generator has a clutch actuated by a control device. The clutch carries out the rotational speed change-over in such a manner that the higher rotational driving speed will be maintained only when a low rotational speed of the internal-combustion engine and at the same time a high current requirement, is present at the electric generator. The current requirement is fed to a regulator for the exciting current which, in turn, is fed to the control device.
In the German Patent Document DE-OS 28 01 812, a planetary transmission is arranged coaxially on a crankshaft end. The sun gear of the planetary transmission is provided with an electromagnetically stallable clutch disk. The ring gear of the planetary transmission drives auxiliary devices. When the sun gear is free, all auxiliary devices are driven at a low rotational speed. When the sun gear is fixed, the rotational output speed of the ring gear will increase so that all auxiliary devices are driven at a joint higher rotational speed. The change-over of the clutch disk takes place as a function of several parameters, for example, of the battery charging current or the cooling water temperature of the internal-combustion engine.
From the above-mentioned prior art, it is known to change over the rotational speed of the drive of the auxiliary devices as a function of parameters between a low and a higher rotational speed. A continuous adaptation or a disconnecting of one or several auxiliary devices is not possible.
It is an object of the invention to provide a method and arrangement for operating a drive for auxiliary devices of an internal-combustion engine which permits a controlled drive of individual auxiliary devices according to the requirements.
This and other objects are achieved by the present invention which provides a method of operating a drive for a plurality of auxiliary devices arranged on an internal-combustion engine in a motor vehicle, having a differential gear arranged between the internal-combustion engine and the auxiliary devices. The method includes switching on and off with a regulator in a timed manner an exciting current. The exciting current is supplied to a first auxiliary device as a function of a rotational speed of the generator such th
Dr. Ing. h.c.F. Porsche AG
Kamen Noah P.
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