Single conductor multi-frequency electric wiring system for vehicles

• US 4,463,341 A
• Filed: 06/01/1981
• Issued: 07/31/1984
• Est. Priority Date: 06/01/1981
• Status: Expired due to Fees

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Iwasaki, Shinichiro
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US06/268,904
• Time in Patent Office: 1,156 Days
• Field of Search: 340/310 A, 340/52 F, 340/825.76, 340/825.71, 340/825.05, 307/10 LS, 307/10 R, 307/40
• US Class Current: 340/13.36
• CPC Class Codes: B60R 16/0315 using multiplexing techniques multiplexing for transmission of signals G08C15/00; multiplexing for electrical communication in general H04J
• CPC Class Codes: G08C 15/02 simultaneously, i.e. using frequency division

Abstract

A wiring system for use in vehicles wherein a common single conductor bus is utilized for both power and control function transmission. A plurality of transmitters attached to the bus receive power from the bus and supply control signals to the bus as required. A plurality of receivers, attached to the bus, receive power and the control signals from the bus. Each receiver is tuned to respond only to the particular control signal produced by a single transmitter. Upon receipt of the appropriate control signals, the receivers couple power from the bus to various loads.

Claims

1. A wiring system comprising:

a source of electrical power;

at least one electrically conductive bus coupled to said source of power;

transmitting means coupled to receive a control input from a control source and coupled to said at least one conductive bus for receiving said power from said bus and for superimposing at least one control signal on said bus in response to said control input; and

receiver means coupled to said at least one conductive bus for receiving said power and said control signal from said bus and for coupling said power from said bus to a load in response to said control signal;

wherein said receiver means comprises;

bandpass filter means coupled to said at least one bus for receiving said control signal from said bus and for rejecting any other signals appearing on said bus, comprising,

input transformer means coupled to said at least one bus for stepping up the voltage levels of signals appearing on said bus, and crystal filter means coupled to the output of said input transformer means for filtering said signals appearing on said bus,

said crystal filter means coupling said received control signal to an output of said filter means;

detector means coupled to said output of said crystal filter means for generating a switching signal upon the detection of the presence of said received control signal at the output of said filter means; and

power switch means coupled between said at least one bus and said load and coupled to receive said switching signal from said detector means for coupling said power from said at least one bus to said load in response to said switching signal.

6. The wiring system as recited in claim 1 or claim 2, which further comprises:

filter means coupled between said electric power source and said at least one bus for preventing AC signals appearing on said bus from reaching said power source.

2. A wiring system comprising:

a source of electric power;

at least one electrically conductive bus coupled to said source of power, said bus formed of a single conductor;

a plurality of transmitter means coupled to said at least one bus for receiving power from said at least one bus, each of said plurality of transmitter means being coupled to a particular one of a plurality of control sources for receiving a control input from said particular one control source, said each transmitter means including a crystal oscillator means for generating a control signal having a specific frequency in response to said control input and superimposing said control signal on said bus; and

a plurality of receiver means coupled to said at least one bus for receiving power and control signals from said bus, each of said receiver means including crystal filter means tuned to a respective frequency generated by one of said plurality of transmitter means and coupled to a respective load for supplying power from said bus to said load in response to the receipt of said particular control signal having a frequency to which said each crystal filter means is turned;

wherein said receiver means comprises;

said crystal filter means comprising crystal bandpass filter means coupled to said at least one bus for receiving said control signal from said bus and for rejecting any other signals appearing on said bus, said filter means coupling said received control signal to an output of said filter means;

detector means coupled to said output of said filter means for generating a switching signal upon the detection of the presence of said received control signal to the output of said filter means; and

power switch means coupled between said at least one bus and said load and coupled to receive said switching signal from said detector means for coupling said power from said at least one bus to said load in response to said switching signal;

wherein said crystal bandpass filter means comprises;

input transformer means coupled to said at least one bus for stepping up the voltage levels of signals appearing on said bus; and

a crystal bandpass filter coupled to the output of said input transformer means for filtering said signals appearing on said bus.

3. The wiring system as recited in claim 2, wherein said transmitter means comprises:

switch means coupled to receive said control signal from said crystal oscillator means and coupled to receive said control input from said control source for coupling said control signal to an output of said switch means in response to said control input; and

output transformer means coupled between said output of said switch means and said at least one bus for supplying said control signal received from said switch means to said at least one bus.

4. The wiring system as recited in claim 3, wherein said output transformer means includes a toroidal-shaped core, said core including a plurality of turns of a magnetically soft high permeability amorphous metal tape.

5. The wiring system as recited in claim 2, wherein said input transformer means includes a toroidal-shaped core, said core including a plurality of turns of a magnetically soft high permeability amorphous metal tape.