Engine interlocking device
First Claim
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1. An engine interlocking device, which comprises:
- a starter switch coil connected through an ignition switch to a power source, a first inverter circuIt whose input terminal is connected through said ignition switch to said power source and is connected through a switch which responds to the starting or stopping of said engine to ground;
a flip-flop circuit comprising a first NAND circuit having an input terminal connected through said ignition switch to said power source and second NAND circuit having an input terminal connected to the output terminal of said first inverter circuit;
a timing circuit comprising a condenser connected to the output terminal of said second NAND circuit of said flip-flop circuit;
a second inverter circuit whose input terminal is connected to the output terminal of said timing circuit;
a third NAND circuit having one input terminal for receiving a signal in response to the condition of connection of a seat belt and whose other input terminal is connected to the output terminal of said second inverter circuit;
a third inverter circuit connected to the output terminal of said third NAND circuit;
a switching element controlled by the output of said third inverter circuit; and
a relay for opening an excitation circuit of said starter switch coil by actuating at the time said switching element is turned on said relay being connected through said ignition switch to said power source;
whereby said engine may be started after it stops provided said ignition switch is turned off and then on after a predetermined interval.
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Abstract
An engine interlocking device for preventing the starting of an engine when the driver does not use a safety seat belt under normal conditions by detecting the proper use of the seat belt provided at each seat. The engine interlocking device however allows the engine to be started without the proper use of the seat belt only during an emergency when for example, the engine stops while the key switch in ON. This is provided by means of a unique yet simple structure comprising a timing circuit and a logic circuit.
12 Citations
2 Claims
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1. An engine interlocking device, which comprises:
- a starter switch coil connected through an ignition switch to a power source, a first inverter circuIt whose input terminal is connected through said ignition switch to said power source and is connected through a switch which responds to the starting or stopping of said engine to ground;
a flip-flop circuit comprising a first NAND circuit having an input terminal connected through said ignition switch to said power source and second NAND circuit having an input terminal connected to the output terminal of said first inverter circuit;
a timing circuit comprising a condenser connected to the output terminal of said second NAND circuit of said flip-flop circuit;
a second inverter circuit whose input terminal is connected to the output terminal of said timing circuit;
a third NAND circuit having one input terminal for receiving a signal in response to the condition of connection of a seat belt and whose other input terminal is connected to the output terminal of said second inverter circuit;
a third inverter circuit connected to the output terminal of said third NAND circuit;
a switching element controlled by the output of said third inverter circuit; and
a relay for opening an excitation circuit of said starter switch coil by actuating at the time said switching element is turned on said relay being connected through said ignition switch to said power source;
whereby said engine may be started after it stops provided said ignition switch is turned off and then on after a predetermined interval.
- a starter switch coil connected through an ignition switch to a power source, a first inverter circuIt whose input terminal is connected through said ignition switch to said power source and is connected through a switch which responds to the starting or stopping of said engine to ground;
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2. An engine ignition switch interlocking device for preventing the starting of the engine of a vehicle under normal conditions when a seat belt is unfastened which comprises:
- a flip-flop circuit having two inputs for receiving a first signal in response to the turning on or off of said ignition switch and a second signal in response to the starting or stopping of said engine, said flip-flop circuit including a first NAND circuit having an input terminal connected through said ignition switch to a power source and a second NAND circuit having one input terminal connected to an inverter circuit, wherein the input terminal of said inverter circuit is connected through said ignition switch to said power source and is also connected to ground through a switch that responds to starting or stopping of said engine, a timing circuit connected to an output of said flip-flop circuit, a logic circuit having two inputs connected to an output of said timing circuit and an output responsive to the condition of said seat belt;
a switching element controlled by the output of said logic circuit; and
a relay for opening an excitation circuit of a starter switch coil actuated at the time said switching element is turned on.
- a flip-flop circuit having two inputs for receiving a first signal in response to the turning on or off of said ignition switch and a second signal in response to the starting or stopping of said engine, said flip-flop circuit including a first NAND circuit having an input terminal connected through said ignition switch to a power source and a second NAND circuit having one input terminal connected to an inverter circuit, wherein the input terminal of said inverter circuit is connected through said ignition switch to said power source and is also connected to ground through a switch that responds to starting or stopping of said engine, a timing circuit connected to an output of said flip-flop circuit, a logic circuit having two inputs connected to an output of said timing circuit and an output responsive to the condition of said seat belt;
Specification
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Current AssigneeKosaku Uota
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Original AssigneeKosaku Uota
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InventorsUota, Kosaku
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Primary Examiner(s)Hohauser, Herman
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Application NumberUS05/426,080Time in Patent Office615 DaysField of Search340/52E,52R,278 307/2SB 180/82CUS Class Current180/270CPC Class CodesB60R 2022/4816 for sensing locking of buckleB60R 2022/4891 preventing use of the vehic...B60R 22/48 Control systems, alarms, or...
