Electricity: electrical systems and devices – Safety and protection of systems and devices – Motor protective condition responsive circuits
Patent
1978-07-07
1980-06-24
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Motor protective condition responsive circuits
361241, 290 37A, 123179BG, 290 38R, 123102, 307 10BP, H02H 718, H02H 314
Patent
active
042098165
ABSTRACT:
A protective control for the starter and electrical systems of a motor vehicle, including a main relay for controlling the electrical system, and a starter relay for controlling the starter system. Electronic logic is provided for the electrical system which: (1) prevents energization of the main relay if the battery polarity is reversed; (2) if the battery polarity is correct, turns on the main relay when a master switch is closed; and (3) maintains the main relay in an ON condition when an AC signal from the alternator is sensed even if the masterswitch is subsequently opened. The latter prevents disconnection of the battery from the electrical system while the engine is running. Electronic logic is also provided for the starter relay which: (1) after the main relay is closed, turns on the starter relay when a starter switch is closed, to thus permit cranking of the engine; (2) automatically deenergizes the starter relay when the AC signal from the alternator attains a designated threshold frequency, which corresponds to a pre-determined engine RPM at which it is desired to disengage the starter; and (3) has a hysteresis network to prevent subsequent re-energization of the starter relay until the AC signal from the alternator drops to a value substantially below the original threshold frequency, preferably when the engine is stopped or almost stopped, whereby the starter switch will re-energize the starter relay only if the master switch is closed and the engine is not running.
REFERENCES:
patent: 2668247 (1954-02-01), Short et al.
patent: 3365614 (1968-01-01), Lvongo et al.
patent: 3440433 (1969-04-01), Coman
patent: 3577001 (1971-05-01), Cummins
patent: 3857043 (1974-12-01), Habasch
patent: 3893007 (1975-07-01), Mori
Autio William A.
Eaton Corporation
Rather Hugh R.
Salce Patrick R.
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