Motor vehicle battery disconnect switch circuits

a technology of battery disconnect and switch circuit, which is applied in the direction of safety/protection circuit, engine starter, machine/engine, etc., can solve the problems of non-trivial voltage drop, attendant heating, and the possibility of operation of cranking motor, so as to avoid inadvertent battery drain
US20050001587A1Active Publication Date: 2005-01-06INT TRUCK INTPROP LLC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
INT TRUCK INTPROP LLC
Publication Date
2005-01-06

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Abstract

A disconnect switch (30, 30SA) is placed in circuit between a battery bank (12) and a distribution point (30B) for the entire electrical system load except the engine cranking motor (24). This allows the circuit between the battery bank and a cranking motor solenoid (22) that operates the cranking motor to be switch-free. A switch-free circuit allows a continuous cable to connect the battery bank to the cranking motor solenoid, significantly reducing the electrical resistance between the battery bank and the cranking motor solenoid.
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Description

FIELD OF THE INVENTION

[0001] This invention relates generally to electrical systems of motor vehicles. More particularly, the invention relates to battery disconnect circuits for preventing battery drain when the engine does not run for extended periods of time. BACKGROUND OF THE INVENTION

[0002] Certain motor vehicles, heavy trucks that are powered by diesel engines for example, may be parked for extended periods of time. If its engine is allowed to keep running after a vehicle has been parked, the alternator should be effective to keep the battery bank charged. If the engine is shut down, either intentionally by the driver, or automatically by a device such as an idle shutdown timer, while the circuits for electric devices remain on, the battery bank will begin to drain. For example, an ignition switch will typically remain on after an idle shutdown timer has timed out, and certain circuits that are left on may continue to draw current.

[0003] Because the battery bank must be abl...

Claims

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