Time multiplexed electric wiring system for control and monitoring of field points

• US 3,952,286 A
• Filed: 07/26/1974
• Issued: 04/20/1976
• Est. Priority Date: 07/28/1973
• Status: Expired due to Term

• Current Assignee: Nippon Soken, Inc., Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Nippon Soken, Inc., Toyota Jidosha Kogyo Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Arai, Hiroshi, Kuno, Akira, Akita, Shigeyuki, Wakamatsu, Hisato
• Primary Examiner(s): Yusko, Donald J.
• Application Number:
  US05/492,204
• Time in Patent Office: 634 Days
• Field of Search: 340/147 LP, 340/163, 340/167 R
• US Class Current: 340/3.42
• 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 15/12 the signals being represented by pulse characteristics in transmission link

Abstract

There is provided an electric wiring system in which a plurality of electric components, a plurality of command switches for actuating the electric components and a plurality of sensors, etc., are provided at various points of an automotive vehicle, transmitting and receiving units of time-shared pulse transmission type which are arranged at the various points of the vehicle are interconnected through a plurality of electric wires or lines, the electric components or loads are divided into a plurality of locals each thereof including a group of the loads, and the transmission and reception of information between the respective locals and a command section is effected by a time-shared pulse transmission method, whereby reducing the hazard of short-circuit fault.

Claims

1. An electric wiring system for interconnecting a plurality of local blocks each thereof including a transmitter and receiver unit having transmitting and receiving functions and a plurality of terminals and a plurality of terminals means each thereof having an assigned address connected respectively to each of said terminals, wherein at least one of said plurality of local blocks further includes oscillator means for generating a reference signal and means for generating a synchronous signal having a period of desired cycle of said reference signal, and wherein each of said transmitter and receiver units includes a plurality of transmitting and receiving blocks commonly connected to said terminals, a plurality of selector terminals for applying selecting signals to select one of said transmitting and receiving blocks corresponding to the assigned address of said terminal means and a counting block for receiving said synchronous signal and reference signal and for time-dividing each period of said synchronous signal by said reference signal to designate the address in order and for making the designated address agree with said assigned address and for applying said designated address to said transmitting and receiving blocks, thereby accomplishing transmission and reception of signals among said local blocks corresponding to said assigned address by said transmitting and receiving blocks selected by said selecting signals.

2. A system according to claim 1, wherein said terminal means comprises a plurality of sensors.

3. A system according to claim 1, wherein said terminal means comprises a plurality of actuating means.

4. A system according to claim 1, wherein said selecting signals for selecting one of said transmitting and receiving blocks corresponding to the same specific address are added to a selector terminal of each transmitter and receiver unit in first and second local blocks, and a plurality of sensors are connected to the terminal means of said first local block and a plurality of driving means are connected to the terminal means of said second local block, thereby each of said driving means corresponding to each specific address of said sensors is driven.

5. An electric wiring system for interconnecting a plurality of local blocks each thereof including a transmitter and receiver unit, said transmitter and receiver unit including a plurality of detecting terminals respectively connected to a plurality of sensors each having an assigned address and a plurality of terminals respectively connected to a plurality of actuating means each having an assigned address, each said transmitter and receiver unit serving signal transmitting and receiving functions, wherein at least one of said plurality of local blocks further includes oscillator means for generating a reference signal and means for generating a synchronous signal, and wherein each said transmitter and receiver unit includes a plurality of transmitting and receiving blocks, a plurality of selector terminals for selecting and causing one of said plurality of transmitting and receiving blocks to perform the signal transmitting and receiving functions, a frequency dividing circuit for dividing the frequency of said reference signal, a reset circuit for receiving said synchronous signal to reset said frequency dividing circuit, and a logical circuit for receiving a plurality of frequency-divided output signals of said frequency dividing circuit and a signal from one of said detecting terminals to generate a level signal designating a corresponding one said assigned addresses, whereby accomplishing the transmission and reception of signals among said assigned addresses.

6. A system according to claim 5, wherein each said transmitter and receiver unit includes a counting block for dividing the frequency of said reference signal for every period of said synchronous signal to generate an address signal corresponding to each of said addresses, a plurality of transmitting and receiving blocks adapted to received said address signal from said counting block and operatively associated with the signal transmitting and receiving functions of said plurality of local blocks, and a plurality of selector terminals for selecting and causing one of said plurality of transmitting and receiving blocks to effect a time-shared multiplex signal transmission and reception according to said address signal, whereby to accomplish said signal transmission and reception among said addresses.

7. A system according to claim 5, wherein one of said plurality of local blocks further includes logical processing means for receiving and performing a logical operation such as a check on a signal transmitted from each of said plurality of local blocks and sending back thereto a resultant command signal.

8. A system according to claim 5, wherein each of said transmitting and receiving blocks serves multiplex signal transmission and receiving functions involving a number of addresses corresponding to the number of said terminals connected to said plurality of sensors and actuating means.

9. A system according to claim 5, wherein said reference signal and said synchronous signal are respectively transmitted along a separate transmission line.