Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1985-08-12
1987-01-20
Shoop, Jr., William M.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
340347DA, G05B 1918
Patent
active
046382283
ABSTRACT:
To increase the resolution of digital words, for example eight-bit words, being supplied via a digital/analog (D/A) converter (2) to a closed control loop, the lowest-order bit (2a) is chopped with a duty cycle, that is, controlled pulse duration/pulse gap ratio, for accurate resolution of the entire word being transmitted. The D/A converter will provide an output of undulating or wavy form, which undulations or waves are averaged or integrated by a low-pass filter (5) or low-pass transmission characteristics of a controller (6) or the overall control loop (4-6-7-8-9-10-11-4) to which the analog signal is applied as a command signal. The system is particularly suitable for accurate control of a fuel supply control element, such as a throttle (9), in the induction pipe of an internal combustion engine using only eight-bit command words, by not transmitting the lowest-order bit in steady-state form but, rather, chopped with controlled duty cycle for conversion of the chopping effect into analog form in the D/A converter (2). The repetition frequency of the pulse duration modulation is suppressed by the low-pass filter or filter characteristics of the control loop.
REFERENCES:
patent: 3987436 (1976-10-01), Candy et al.
Seitzer et al., "Electronic Analog-to-Digital Converter", pp. 58-61; 105, John Wiley and Sons.
Junginger Erich
Schnaibel Eberhard
Schneider Erich
Bergmann Saul M.
Robert & Bosch GmbH
Shoop Jr. William M.
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