CONTROL DEVICE, CONTROL METHOD, CONTROL DEVICE OF VEHICLE, AND CONTROL SYSTEM OF VEHICLE

• US 20090240392A1
• Filed: 03/13/2009
• Published: 09/24/2009
• Est. Priority Date: 03/18/2008
• Status: Active Grant

• Current Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Original Assignee: Fujitsu Ten Limited (DENSO Corporation)
• Inventors: IWANAGA, Takehito, YAMASHITA, Shinji, UMEYAMA, Shigeto
• Granted Patent: US 8,321,084 B2
• Time in Patent Office: Days
• US Class Current: 701/33
• CPC Class Codes: H03M 7/46 Conversion to or from run-length codes, i.e. by representing the number of consecutive digits, or groups of digits, of the same kind by a code word and a digit indicative of that kind

Abstract

Provided is a control device including: a storage portion for storing binary data transmitted from outside and received successively; and a control portion for carrying out processing including: production processing of producing a frame where of the stored binary data, pieces of data expressing events occurring in a predetermined period are placed into a group among which pieces of data expressing events each having a small degree of variation are arranged so as to be close to each other; difference computing processing of arranging the frames produced at intervals of the predetermined time in a predetermined order and of computing a difference between two adjacent frames; compression processing of compressing a result of the computation by a run length method; and recording processing of recording, to a recording portion, a first frame in the difference computing processing, a number of difference computations, and the compressed data.

Claims

1. A control device that compresses binary data expressing an external varying event and records the compressed binary data, the control device comprising:

a storage portion for accumulating and storing the binary data received successively from outside; and

a control portion for carrying out processing including;

production processing of producing a frame in which of a plurality of pieces of binary data accumulated and stored in the storage portion, pieces of data expressing events occurring in a predetermined period are placed into a group among which pieces of data expressing events each having a small degree of variation are arranged so as to be close to each other;

difference computing processing of arranging a plurality of frames produced at intervals of the predetermined time by the production processing in a predetermined order and of computing a difference between two adjacent frames;

compression processing of compressing a computation result of the difference computing processing by a run length method; and

recording processing of recording, to a recording portion, a first frame in the difference computing processing, a number of difference computations, and the data compressed by the compression processing.

2. The control device according to claim 1, wherein the control portion carries out error detection data adding processing for adding data for detecting an error with respect to the data compressed by the compression processing on a predetermined data basis different from the frame.

3. The control device according to claim 2, wherein the production processing includes arranging pieces of binary data each expressing an event having a small degree of variation while having a high degree of importance separately from each other in the produced frame so as to have error detection data added thereto by the error detection data adding processing.

4. The control device according to claim 1, wherein the compression processing includes compressing binary data other than binary data each expressing an event having a large degree of variation in a frame serving as a compression target.

7. A control system of a vehicle, wherein:

a plurality of electronic control units each controlling a controlled portion of the vehicle and a control device according to claim 1 are connected to each other through a network; and

the control device receives binary data transmitted successively from the electronic control units through the network and accumulates and stores the binary data in the storage portion.

8. The control system of a vehicle according to claim 7, wherein the production processing includes producing a frame in which pieces of binary data each expressing an event having a small degree of variation are dynamically arranged so as to be close to each other according to a state of the vehicle.

5. A control device that compresses binary data input from an electronic control unit mounted in a vehicle and expressing an external varying event and records the compressed binary data, the control device comprising:

a storage portion for accumulating and storing the binary data received successively from outside; and

a control portion for carrying out processing including;

production processing of producing a frame in which of a plurality of pieces of binary data accumulated and stored in the storage portion, pieces of data expressing events occurring in a predetermined period are placed into a group among which pieces of data expressing events each having a small degree of variation in vehicle control are arranged so as to be close to each other;

difference computing processing of arranging a plurality of frames produced at intervals of the predetermined time by the production processing in a predetermined order and of computing a difference between two adjacent frames;

compression processing of compressing a computation result of the difference computing processing by a run length method; and

recording processing of recording, to a recording portion, a first frame in the difference computing processing, a number of difference computations, and the data compressed by the compression processing.

6. The control device according to claim 5, wherein the production processing includes producing a frame in which pieces of binary data each expressing an event having a small degree of variation are dynamically arranged so as to be close to each other according to a state of the vehicle.

9. A control method for compressing binary data expressing an external varying event and for recording the compressed binary data, the control method comprising the steps of:

a production step of producing a frame in which of a plurality of pieces of binary data transmitted successively from outside and accumulated and stored in the storage portion, pieces of data expressing events occurring in a predetermined period are placed into a group among which pieces of data expressing events each having a small degree of variation are arranged so as to be close to each other;

a difference computing step of arranging a plurality of frames produced at intervals of the predetermined time in the production step in a predetermined order and of computing a difference between two adjacent frames;

a compression step of compressing a computation result of the difference computing step by a run length method; and

a recording step of recording, to a recording portion, a first frame in the difference computing step, a number of difference computations, and the data compressed in the compression step.