Electric current control circuit for switches
First Claim
1. An electric current control circuit for automotive vehicles having a plurality of switching circuits each comprising a switch, said circuit controlling the cutting off of all current flow to the switching circuits, comprising:
- a common switching device connected with the respective switching circuits so as to switch on and off an electric current flowing into each switching circuit to indicate the state of the switch thereof,detector means connected to the switching circuits'"'"' switches for detecting the on and off states thereof and for producing indicative outputs while detecting the states, andcontroller means having an input connected with the detector means for receiving said indicative outputs and having an output connected with the common switching device for controlling the common switching device in accordance with said indicative outputs from the detector means and switching off said common switching device to cut off all current flow to the switching circuits when a selected combination of switches of said switching circuits is detected to be in the off state.
1 Assignment
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Accused Products
Abstract
In a device for detecting the operative states of switches, a common switching device 17 is connected in series with input resistors 16, and currents flowing into switching circuits are cut off when it is judged based on the states of switches 10 to 15 that a vehicle is being parked. Further, a detector 19 is so set as to perform its detection only at specified intervals. The switching device 17 is turned on at the detection timing of the detector 19 and is, when the detector 19 performs no detection, turned off so as to prevent the currents from flowing into the respective switching circuits. With the above construction, the currents flowing into the switching circuits can perfectly be cut off while the vehicle is being parked, and the input resistors in use are less than in the prior art. Further, since the currents flow through the input resistors at specified intervals, an average power consumption of each input resistor can be reduced, enabling the use of input resistors having a low rated power.
19 Citations
20 Claims
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1. An electric current control circuit for automotive vehicles having a plurality of switching circuits each comprising a switch, said circuit controlling the cutting off of all current flow to the switching circuits, comprising:
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a common switching device connected with the respective switching circuits so as to switch on and off an electric current flowing into each switching circuit to indicate the state of the switch thereof, detector means connected to the switching circuits'"'"' switches for detecting the on and off states thereof and for producing indicative outputs while detecting the states, and controller means having an input connected with the detector means for receiving said indicative outputs and having an output connected with the common switching device for controlling the common switching device in accordance with said indicative outputs from the detector means and switching off said common switching device to cut off all current flow to the switching circuits when a selected combination of switches of said switching circuits is detected to be in the off state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. Apparatus for cutting off all current flow to a set of operating switches in an automotive vehicle when the vehicle is parked, comprising:
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a plurality of switching circuits each comprising a respective switch of said set; a common switching device connected with the respective switching circuits so as to switch on and off an electric current flowing into each switching circuit to indicate the ON and OFF state of the switch thereof; detector means connected to the switches for detecting the ON and OFF states thereof and for producing respective indicative signals of said states; and controller means having a connection to said detector means for receiving said state indicative signals and a connection with the common switching device for controlling the common switching device in accordance with said state indicative signals to cut off all current flow to the switching circuits when a selected combination of switches of said switching circuits is indicated to be in the OFF state. - View Dependent Claims (18)
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19. A method for cutting off all electric current flow to a set of switching circuits in an automotive vehicle having a plurality of switching circuits each comprising a switch, a common switching device connected with the respective switching circuits so as to switch on and off an electric current flowing into each switching circuit to indicate the state of the switch thereof, and a detector system connected to the switches for detecting the ON and OFF states thereof and producing indicative signals of the states, comprising the steps of:
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providing said state indicative signals to a controller; outputting signals from said controller to said common switching device in accordance with said state indicative signals; and causing said common switching device to switch off all current flow to the switching circuits when a selected combination of switches of said switching circuits is indicated to be in the OFF state by said state indicative signals. - View Dependent Claims (20)
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Specification