Data transmission method and system therefor

• US 5,764,919 A
• Filed: 05/31/1995
• Issued: 06/09/1998
• Est. Priority Date: 02/15/1993
• Status: Expired due to Fees

• Current Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Original Assignee: Honda Giken Kogyo Kabushiki Kaisha (Honda Motor Company)
• Inventors: Hashimoto, Hiroshi
• Primary Examiner(s): Rinehart, Mark H.
• Application Number:
  US08/455,512
• Time in Patent Office: 1,105 Days
• Field of Search: 395/200.13, 395/200.14, 395/200.16, 395/200.21, 395/200.11, 395/200.15, 395/200.06, 395/200.17, 395/200.1, 395/183.12, 395/184.01, 395/183.19, 340/825.07, 340/825.16, 340/825.5, 340/825.52, 379/106, 379/107, 364/241.8, 364/440.8, 370/85.1, 370/85.2, 370/85.3, 370/85.4, 370/85.5, 370/85.6, 370/94.1, 370/13, 370/14, 370/15, 370/450, 370/451, 370/452, 178/4.1 C
• US Class Current: 709/236
• 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: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 1/16 in which the return channel carries supervisory signals, e.g. repetition request signals
• CPC Class Codes: H04L 1/1657 Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
• CPC Class Codes: H04L 1/1664 the supervisory signal being transmitted together with payload signals; piggybacking
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1685 the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
• CPC Class Codes: H04L 1/18 Automatic repetition systems, e.g. Van Duuren systems
• CPC Class Codes: H04L 1/1825 Adaptation of specific ARQ protocol parameters according to transmission conditions
• CPC Class Codes: H04L 1/189 Transmission or retransmission of more than one copy of a message
• CPC Class Codes: H04L 12/40013 Details regarding a bus controller
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]
• CPC Class Codes: H04L 12/4135 using bit-wise arbitration
• CPC Class Codes: H04L 12/417 with deterministic access, e.g. token passing
• CPC Class Codes: H04L 2001/0094 Bus
• CPC Class Codes: H04L 2001/0098 Unequal error protection
• CPC Class Codes: H04L 2012/40273 the transportation system being a vehicle
• CPC Class Codes: H04L 67/12 specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks

Abstract

A data transmission system for a vehicle includes a plurality of control systems installed on the vehicle, and a network bus connecting the plurality of control systems with each other for circulating a transmission right through the plurality of control systems to thereby perform transmission of a message between the plurality of control systems. According to a first aspect, each of the control systems starts transmitting data when it is detected that the transmission right is not generated or lost from the system, and continues transmitting the data when no collision of data transmitted from the present control system with data transmitted from the rest of the plurality of control systems, or when by mediation for avoiding the collision is detected, it is determined to continue data transmission. According to another aspect, the maximum number of times of retransmission to be permitted is determined according to a type of failure in transmission identified, and the retransmission is performed so long as the number times of retransmission of the data does not exceed the maximum number of times of retransmission to be permitted. According to still another aspect, the message comprises a first response field for receiving a first acknowledging response output from a control system having received the transmission right, and a second response field for receiving a second acknowledging response output from a control system having received data.

Claims

1. A data transmission method comprising:

connecting a plurality of control systems installed on a vehicle by at least one common signal line, and

transmitting a message between said plurality of control systems over said at least one common signal line while circulating a transmission right through said plurality of control systems,

wherein said message comprises a first response field for receiving a first acknowledging response output from one of said plurality of control systems which has received said transmission right, and a second response field for receiving a second acknowledging response output from one of said plurality of control systems which has received data.

2. A data transmission method according to claim 1, wherein a processing corresponding to said first acknowledging response is performed in preference to a processing corresponding to an absence of said second acknowledging response.

3. A data transmission method according to claim 2, wherein:

said processing corresponding to said first acknowledging response comprises one of waiting for a next reception of said transmission right and a continuation of transfer of said transmission right, and

said processing corresponding to said absence of said second acknowledging response comprises retransmission of said data.

4. A data transmission method comprising:

connecting a plurality of control systems installed on a vehicle by at least one common signal line, and

transmitting a message between said plurality of control systems over said at least one common signal line while circulating a transmission right through said plurality of control systems,

wherein said message comprises a first message having a first response field for receiving a first acknowledging response output from one of said plurality of control systems which has received said transmission right, and a second message having a second response field for receiving a second acknowledging response output from one of said plurality of control systems which has received data,

wherein if said first acknowledging response is detected after said second message is sent, each of said plurality of control systems judges that transfer of said transmission right is completed irrespective of whether or not said second acknowledging response is detected, so that retransmission of said second message is not performed until said transmission right is next acquired, and

wherein if said first acknowledging response is not detected, each of said plurality of control systems sends out said first message to continue transfer of said transmission right.