Data transmission method and system therefor

• US 5,586,118 A
• Filed: 05/31/1995
• Issued: 12/17/1996
• 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: Nagatani, Yuji, Hashimoto, Hiroshi, Ishii, Jun
• Primary Examiner(s): MARCELO, MELVIN C
• Application Number:
  US08/455,247
• Time in Patent Office: 566 Days
• Field of Search: 370/13, 370/14, 370/15, 370/85.1, 370/85.2, 370/85.4, 340/825.16, 340/825.5
• US Class Current: 370/451
• 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 a 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. In a data transmission system for a vehicle, including a plurality of control systems installed on said vehicle, and a network bus connecting said plurality of control systems with each other for circulating a transmission right through said plurality of control systems to thereby perform transmission of a message between said plurality of control systems,

the improvement wherein each one of said plurality of control systems comprises:

transmitter-receiver means for transmitting data to or receiving data from other ones of said plurality of control systems via said network bus;

transmission failure-detecting means for detecting a failure in transmission of said data;

failure type-identifying means for identifying a type of said failure in transmission of said data;

retransmission control means for determining a maximum number of times of retransmission to be permitted according to said type of failure in transmission identified by said failure type-identifying means, and for causing said transmitter-receiver means to retransmit said data so long as the number of times of retransmission of said data does not exceed the maximum number of times of retransmission to be permitted;

wherein said transmitter-receiver means includes means for transferring the transmission right to another control system when the number of times of failure to retransmit said data exceeds the maximum number of times of retransmission to be permitted;

wherein the failure type-identifying means comprises means for detecting whether an acknowledging response is present, and whether an error in transmission has occurred; and

wherein said transmission failure-detecting means comprises monitoring means for determining that said error in transmission has occurred when data being transmitted does not coincide with data loaded on said network bus.

2. A data transmission system according to claim 1, wherein said retransmission control means sets the maximum number of times of retransmission to be permitted to a larger number when said error in transmission is detected than when no acknowledging response is detected.

3. In a data transmission system for a vehicle, including a plurality of control systems installed on said vehicle, and a network bus connecting said plurality of control systems with each other for circulating a transmission right through said plurality of control systems to thereby perform transmission of a message between said plurality of control systems,

the improvement wherein each one of said plurality of control systems comprises:

transmitter-receiver means for transmitting data to or receiving data from other ones of said plurality of control systems via said network bus;

transmission failure-detecting means for detecting a failure in transmission of said data;

failure type-identifying means for identifying a type of said failure in transmission of said data;

retransmission control means for determining a maximum number of times of retransmission to be permitted according to said type of failure in transmission identified by said failure type-identifying means, and for causing said transmitter-receiver means to retransmit said data so long as the number of times of retransmission of said data does not exceed the maximum number of times of retransmission to be permitted; and

wherein;

the failure type-identifying means comprises means for detecting whether an acknowledging response is present, and whether an error in transmission has occurred; and

said retransmission control means sets the maximum number of times of retransmission to be permitted to a larger number when said error in transmission is detected than when no acknowledging response is detected;

wherein said transmission failure-detecting means includes monitoring means for determining that said error in transmission has occurred when data being transmitted does not coincide with data loaded on said network bus.