Circuit for protecting against shorts in starter motor and battery charging cables
First Claim
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1. A motor vehicle comprising:
- an engine that is started by cranking; and
an electrical system that comprises a D.C. voltage source, an electric motor for cranking the engine, a first switch that is selectively positionable to plural positions, one of which is a start position for cranking the engine, a second switch that is controlled by the first switch, a first input feed, comprising a circuit protection device, from the D.C. voltage source to a first terminal of the second switch, a second input feed, that is free of any circuit protection device, from the D.C. voltage source to a second terminal of the second switch, an output feed from a third terminal of the second switch to an input terminal of a fourth switch that has an output terminal connected to the electric motor, wherein when the first switch is in any position other than the start position, the second switch connects the first input feed to the output feed, and when the first switch is in the start position, the second switch connects the second input feed to the output feed.
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Accused Products
Abstract
When an ignition switch (22) is operated to other than a start position for cranking an engine (20), a switch (relay 28) places a megafuse (30) in circuit with protecting cables to the electric starter motor (18) and alternator (16) to protect against shorts. When ignition switch (22) is operated to start position for cranking the engine (20), switch (28) removes the megafuse (30) from protecting the cables. If a short blew the megafuse (30) before starting, the ignition switch (22) cannot operate the switch (28) and the engine cannot be cranked.
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Citations
9 Claims
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1. A motor vehicle comprising:
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an engine that is started by cranking; and an electrical system that comprises a D.C. voltage source, an electric motor for cranking the engine, a first switch that is selectively positionable to plural positions, one of which is a start position for cranking the engine, a second switch that is controlled by the first switch, a first input feed, comprising a circuit protection device, from the D.C. voltage source to a first terminal of the second switch, a second input feed, that is free of any circuit protection device, from the D.C. voltage source to a second terminal of the second switch, an output feed from a third terminal of the second switch to an input terminal of a fourth switch that has an output terminal connected to the electric motor, wherein when the first switch is in any position other than the start position, the second switch connects the first input feed to the output feed, and when the first switch is in the start position, the second switch connects the second input feed to the output feed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification