Self-monitor system for automotive digital control system insens

Details Self-monitor system for automotive digital control system insens Self-monitor system for automotive digital control system insens

1987-11-30

1989-08-29

Lall, Parshotam S.

Boots, shoes, and leggings

123491, 73116, 3644311, 364550, G06F 1122

Patent

active

048623644

ABSTRACT:
A self-monitor system has a delay circuit active in response to the end of engine cranking to enforce a predetermined time delay which is long enough for battery voltage to recover to normal levels. The delay circuit outputs a command for execution of self-monitoring operations by the digital control system after the predetermined time delay. The self-monitor system in the digital control system is responsive to the command from the delay circuit to check the battery voltage and to apply dummy loads to system elements at levels sufficient to simulate actuation of the elements to be checked, such as sensors, actuators and/or indicators. By enforcing the time delay time, the influence of temporary drops in battery voltage due to overloading during engine cranking can be fully avoided.

REFERENCES:
patent: 4282574 (1981-08-01), Yoshida et al.
patent: 4310888 (1982-01-01), Furuhashi et al.
patent: 4397281 (1983-08-01), Nakano et al.
patent: 4401949 (1983-08-01), Gold
patent: 4517952 (1985-05-01), Hosoya
patent: 4709341 (1987-11-01), Matsuda

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