Electricity: motive power systems – Positional servo systems
Patent
1987-10-09
1989-09-05
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
318563, 318565, 307 101, 280735, G05B 902, G05B 2302
Patent
active
048642029
ABSTRACT:
To prevent spurious operation of a controlled operating element (12), typically a safety element which can be irreversibly triggered, such as a trigger or firing cartridge of a passenger restraint airbag, while providing for reliable operation in case of a crash of a vehicle in which the airbag is installed, a control signal is derived from a computer (10) processing input signals. The transmission of the control signals from the computer (10) to the operating element (12) is through a time delay stage (30) which has a time delay of sufficient length to permit the computer to correct, if necessary, signals from its output (16) and to carry out tests on the output signals from the computer apparatus. An evaluation circuit (18) continuously compares the output signals with check values. The check values may be derived from, for example a second computer similar to the computer, or from stored representative values. If the comparison indicates coincidence, the operating control signal from the computer is transmitted to the operating element (12). If, however, e.g. due to extraneous disturbances, a deviation between the test samples and the signals derived from the output (16) of the computer indicates a deviation, transmission of the control signals from the computer (10) to the operating element (12) is prevented, and the computer is controlled to repeat its computation, or part of a computation cycle.
REFERENCES:
patent: 4059822 (1977-11-01), Toshioka et al.
patent: 4359715 (1982-11-01), Langer et al.
patent: 4672223 (1987-06-01), Badge et al.
patent: 4674049 (1987-06-01), Kubo
patent: 4700304 (1987-10-01), Byrne et al.
patent: 4701854 (1987-10-01), Matsuda
patent: 4745542 (1988-05-01), Baba et al.
Drobny Wolfgang
Jeenicke Edmund
Nitschke Werner
Taufer Peter
Weller Hugo
Ro Bentsu
Robert & Bosch GmbH
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