Electrical transmission or interconnection systems – Vehicle mounted systems – Automobile
Patent
1996-05-10
1998-04-07
Elms, Richard T.
Electrical transmission or interconnection systems
Vehicle mounted systems
Automobile
315 82, B60L 114
Patent
active
057367949
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Prior Art
The invention is based on a circuit arrangement for affecting signals including a first circuit section in which at least one signal to be processed occurs, and a second circuit section containing a signal processing unit as well as a device for correcting the signal. Such a circuit arrangement is known from EP-A 0 263 305, wherein the measured values detected by sensors are supplied to amplifiers whose amplification factors and offset errors are corrected. The appropriate correction signals are derived from the output signals of the sensors in a correction signal path and, if required, from further sensors which detect the environmental parameters. The output signals of all sensors are supplied via a multiplexer disposed in the correction signal path to an analog/digital converter, whose digital output signal forms at least a portion of the address area of a memory. The digital correction values stored at defined memory locations are read out and converted back into analog signals via a digital/analog converter and are divided via a demultiplexer into the correction signals for the amplification factor and for the offset. The known circuit arrangement allows both the correction of errors which were detected during a calibration of the circuit arrangements at first start-up and also a correction of measurement signals as a function of environmental conditions present at that time. The correction values stored in the memory normally remain unchanged during the entire operating time of the known circuit arrangements. A possibly occurring long-time drift, in particular a long-time drift of an amplification factor or of an offset error of the amplifier cannot be detected and corrected under these circumstances.
SUMMARY OF THE INVENTION
It is the object of the invention to provide a circuit arrangement for affecting signals which make possible a correction of a signal by simple means.
The above object is attained according to the present invention by a circuit arrangement including a first circuit section in which at least one signal to be processed occurs, and a second circuit section containing a signal processing unit as well as a device for correcting the signal, with a memory, which stores an idle level occurring at an output of the signal processing unit contained in the device for correcting the signal, with the stored idle level being provided for correcting the processed signal, and wherein a switch-on delay unit is provided in the second circuit section which switch-on delay unit, following start-up of the two circuit sections, maintains the first circuit section in the switched-off state for the time (T) predetermined by the switch-on delay unit, the memory stores the occurring idle level during the predetermined time (T), and the signal correction is provided at the end of the predetermined time (T).
ADVANTAGES OF THE INVENTION
The circuit arrangement in accordance with the invention for affecting signals has the advantage that a long-time drift during processing of at least one signal can be corrected with a low outlay in switching technology. In particular, an offset error of an amplifier can be corrected. The circuit arrangement in accordance with the invention is divided into two circuit sections. A switch-on delay unit is provided in the second circuit section which keeps the first circuit section in the switched-off state for a predetermined time after start-up of both circuit sections. During the time predetermined by the switch-on delay unit, an idle level occurring at an output of a signal processing unit is stored in a memory and is used as the correction value for obtaining the correct signal at the end of the predetermined time at which the first circuit section is being placed into operation.
Advantageous developments and embodiments of the circuit arrangement for affecting signals in accordance with the invention ensue from the description.
An advantageous embodiment provides that the signal processing unit contains an operational amplifi
REFERENCES:
patent: 5015921 (1991-05-01), Carlson et al.
Pressure Measurement Using "Smart" Transducers, C. John Easton, Advances in Instrumentation, Oct. 21-24, 1985, Research Triangle Park, NC, USA, pp. 1153-1165.
Elms Richard T.
Robert & Bosch GmbH
LandOfFree
Circuit arrangement for providing signal correction including a does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Circuit arrangement for providing signal correction including a , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit arrangement for providing signal correction including a will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-15674