| 摘要 |
A fail safe control unit comprising a plurality of detecting means, for parameters, abnormal detecting means, correcting means for correcting a basic control value, and controlling means for controlling a controlled means, e.g. an engine in which a first parameter detected by any one of the detecting means is compared with a predetermined first target value when an abnormal signal is not produced from the abnormal detecting means and the basic control value is corrected in accordance with the difference therebetween, while a second parameter is compared with a predetermined second target value which is set on a more safe side than the first target value when the abnormal signal is produced and a control value is calculated in accordance with the difference therebetween, so as to control the engine. With this construction, when any one of the detecting means for detecting the parameters becomes defective, the controlled means, e.g. an engine is kept on operating on the safe side. A method of performing a fail safe control for an engine is also disclosed.
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