Arrangement for operating a consumer in a motor vehicle

Details Arrangement for operating a consumer in a motor vehicle Arrangement for operating a consumer in a motor vehicle

1996-03-04

1998-03-03

Ro, Bentsu

Electricity: motive power systems

Constant motor current, load and/or torque control

318433, 318434, 318293, 388909, H02P 729

Patent

active

057239584

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

U.S. Pat. No. 4,951,188 discloses an arrangement for operating a consumer in a vehicle. There, an output stage is a bridge circuit having four switching elements is suggested. The current passing through the consumer, which is connected in the bridge diagonal branch, is detected and compared to pregiven threshold values. If the current through the consumer exceeds a pregiven maximum value, then a short circuit is assumed in the region of the consumer and the output stage is switched off in such a manner that a switch-on pulse-duty factor of 1% results for carrying out an emergency operation. Short-term disturbances can occur, for example, by disturbing radiation. Even for these short-term disturbances, the output stage can be switched off with this procedure and an emergency operation initiated. In this way, the availability of the arrangement is limited.


SUMMARY OF THE INVENTION

It is therefore an object of the invention to provide an arrangement for operating a consumer wherein the availability is improved especially in connection with short-term disturbances without affecting the operational reliability of the arrangement.
According to a second aspect of the invention, the arrangement for operating the consumer is to be configured in such a manner that an integration of the entire arrangement in one component is made possible. The coupling of this component to a microcomputer for driving an electric positioning motor in combination with the adjustment of a power adjusting element of an internal combustion engine such as a throttle flap or a diesel injection pump is made possible.
Short disturbances in the area of an arrangement for operating a consumer are detected with the procedure according to the invention. However, these disturbances do not necessarily lead to an unwanted effect on the operation so that the availability of the arrangement is considerably improved.
It is especially advantageous that the current through each switching element of the arrangement is detected and is checked as to whether the current exceeds a pregiven maximum value.
A time component is started when the maximum current is exceeded and a fault is only then detected when the maximum current is exceeded for a pregiven time. In this way, short-term disturbances do not lead to a switch-off of the arrangement. The fault detection takes place independently of the clocked driving signal.
In this way, errors are also detected when the drive signal continuously exhibits a high level or a low level.
It is further advantageous that the operational reliability of the arrangement is not affected by counting the detected short disturbances and by a fault reaction when there is a pregiven number of detected disturbances.
In this context, it is further advantageous that current-limiting means are provided which limit the current through the particular switching element to a pregiven maximum value so that a rapid reaction even for short-term disturbances takes place which avoids unwanted operating conditions and yet does not limit the availability of the arrangement; whereas, a long-term check ensures operational reliability by detecting the disturbances and by counting the detected disturbances during a longer continuous fault case and/or by means of the time condition.
For a clocked drive, it is especially advantageous that the switch element, which is detected as being defective during a drive pulse, is again switched on with the next drive pulse when the fault counter has not yet reached the predetermined counter position.
Decrementing the fault counter for correctly operating switch elements leads in an advantageous manner to the situation that distributed faults do not lead to a switch-off. These distributed faults occur at different time points during the operating duration of the system.
An integration into a standard IC-housing is made possible by the advantageous assembly of the drive arrangement without undertaking restrictions with respect to the extent of operation. This leads to a very economi

REFERENCES:
patent: 4439806 (1984-03-01), Brajder
patent: 4528486 (1985-07-01), Flaig et al.
patent: 4951188 (1990-08-01), Peter et al.
patent: 4972133 (1990-11-01), Hirota et al.
patent: 5218339 (1993-06-01), Schrumpf et al.
"Direkter Relais-Ersatz" by Walter Bucksch et al, Elektronik, vol. 42, No. 13, Jun. 1993, Munchen, DE, pp. 86 to 90.

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