Electrical control unit and control system comprising plural electrical control units
First Claim
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1. An electrical control unit for use in a motor driven vehicle, said electrical control unit comprising:
- a communication frame creating unit for creating first communication frames to be transmitted on an external communication bus in response to a request;
a storage unit for temporarily storing second communication frames received from a second electrical control unit, the second communication frames being subjected to gateway processing by said first-mentioned electrical control unit for transmission to said external communication bus; and
a transmission mediating unit for transmitting the first and second communication frames to said external communication bus with transmission priority being assigned alternately to first and second frames currently ready for transmission.
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Abstract
When ENG frames created in an ENG transceiver unit and ECT frames subjected to gateway processing in an ECT gateway processor are transmitted around the same time, a transmission mediating unit alternately transmits each of the ENG frames and the ECT frames. Therefore, as compared with a case where one type of frames are preferentially transmitted, transmission of both types of frames can be started at the earliest timing.
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Citations
13 Claims
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1. An electrical control unit for use in a motor driven vehicle, said electrical control unit comprising:
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a communication frame creating unit for creating first communication frames to be transmitted on an external communication bus in response to a request; a storage unit for temporarily storing second communication frames received from a second electrical control unit, the second communication frames being subjected to gateway processing by said first-mentioned electrical control unit for transmission to said external communication bus; and a transmission mediating unit for transmitting the first and second communication frames to said external communication bus with transmission priority being assigned alternately to first and second frames currently ready for transmission. - View Dependent Claims (2, 3, 4)
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5. A control system for use in a motor driven vehicle, said system comprising:
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a first electrical control unit for creating first communication frames to be transmitted upon receiving respectively corresponding external requests and for transmitting the first communication frames through a first bus; and a second electrical control unit connected to the first electrical control unit through a second bus, wherein the second electrical control unit creates second communication frames to be transmitted in response to respectively corresponding requests from an exterior unit and also transmitted through the first bus via said first electrical control unit, wherein the first electrical control unit includes a transmission mediating unit for transmitting the first and second communication frames to said external communication bus with transmission priority being assigned alternately to first and second frames currently ready for transmission. - View Dependent Claims (6, 7, 8, 9, 10)
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11. A method for mediating transmission of data frames from two direct bus-connected vehicular electronic control units onto a common bus connected to only one of said electronic control units, requested data being provided from both of said vehicular electronic control units to another vehicular electronic unit over said common bus, said method comprising:
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responding to requests for data received on said common bus by generating responsive first and second frames respectively generated by said two directly connected vehicular electronic control units; buffering said first and second frames of data at the vehicular electronic control unit that is connected to said common bus; transmitting said first and second frames of data with transmission priority being assigned alternately to first and second frames currently ready for transmission. - View Dependent Claims (12, 13)
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Specification