JP3498802B2 - Control device for data communication - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitably implemented in various electronic control units mounted on a vehicle, and communicates control data common to a plurality of control units. And a control device for performing individual control using the control data. 2. Description of the Related Art FIG. 3 is a block diagram for explaining a typical prior art. In the plurality of control devices c1 and c2 mounted on the automobile, the control device c1 is, for example, a control device of the automatic transmission 1, and the control device c2 is a control device of the fuel injection valve 2 and the igniter 3. Therefore, the detection results of, for example, the vehicle speed detector s1 and the throttle valve opening detector s2 are input to the control device c1, and the detection results of the intake pressure detector s3 and the rotation speed detector s4 are input to the control device c2. Is entered. Control device c1
Are a vehicle speed detector s1 and a throttle valve opening detector s2
The automatic transmission 1 is controlled so as to attain the optimal gear position in response to the detection result from the control unit. The control device c2 includes an intake pressure detector s3, a rotational speed detector s4, and a line k.
The fuel injection amount and the ignition timing are calculated in response to a shift instruction from the control device c1 input through the control device c1.
And controls the ignition timing of the ignition plug 4 via the igniter 3. Accordingly, in the control device c1, in the processing circuit ua realized by a microcomputer or the like,
When the shift instruction data is generated as indicated by reference numeral a1, the line k is transmitted to the communication circuit t as indicated by reference numeral a2.
2, a transmission request is output. In response to the transmission request, the communication circuit t implemented by an integrated circuit or the like transmits the speed change instruction data to the communication circuit r in the control device c2 via the line k1 as indicated by reference numeral t1. Send. In the communication circuit r realized by an integrated circuit or the like, when the shift instruction data is received as indicated by reference numeral r1, the data is stored in the memory as indicated by reference numeral b1 in the processing circuit ub via the line k3. Is stored in The processing circuit ub is realized by a microcomputer or the like, similarly to the processing circuit ua, and performs internal combustion based on the detection results of the detectors s3 and s4 and the shift instruction data transmitted from the control device c1 as described above. The fuel injection valve 2 and the igniter 3 are controlled so as to be optimal for the load state of the engine and the gear position of the automatic transmission. In the prior art described above, the shift instruction data generated as indicated by reference numeral a1 is stored in a memory as indicated by reference numeral a10 in the processing circuit ua. The automatic transmission 1 is speed-controlled. On the other hand, before the shift instruction data is used for controlling the fuel injection valve 2 and the igniter 3 in the control device c2, the control devices c1 and c
A shift occurs due to a data transmission delay between the two. [0005] The transmission delay becomes remarkable when another control device, for example, c3, c4 is connected to the line k1, and these control devices c3, c4 also receive data from the control device c1. . The control device c3 includes:
For example, a device that controls the hydraulic pressure of a suspension,
The control device c4 is a traction control device that controls the torque distribution to each wheel. As described above, the plurality of control devices c2 to c4
When receiving the control data from the control device c1, the data transmitted via the line k1 includes the address data designating each of the control devices c2 to c4 and the control device c
And control data individually corresponding to 2 to c4. When such data is transmitted while sequentially specifying the control devices c2 to c4, for example, even if a transmission request to the control device c2 occurs, the control device c2
At the point in time when data transmission to is completed, it is necessary to wait for the next transmission timing again, and the above-described transmission delay occurs. In particular, when a priority is assigned to each of the control devices c2 to c4, the frequency of occurrence of the transmission delay increases in a control device with a lower priority. When each of the control devices c2 to c4 performs bidirectional communication, for example, the control devices c1 to c4
2. When a transmission request is issued to the control device c2 at that time,
During transmission of data from the control device c1 to the control device c1,
It must wait until the transmission is finished. As described above, when a data transmission delay occurs, for example, when the shift instruction for increasing the reduction ratio is output from the control device c1, the shift is delayed from the timing at which the shift speed of the automatic transmission 1 is switched. And the control device c2
Starts the retard control of the ignition timing, which causes a deceleration shock. Thus, each control device c1
To c4 perform multiplex communication and attempt to perform control using common control data.
A shift occurs in the handling timing of the control data, and a cooperative operation cannot be performed. SUMMARY OF THE INVENTION It is an object of the present invention to provide a control device for performing data communication in which control data handling timing can be matched. According to the present invention, there is provided a transmitting means for transmitting processed first control data in response to a detection result of a first detecting means, and a transmitting means for transmitting the first control data. A first control unit configured to perform first control using the first control data received by the first reception unit, the first control unit including: a first reception unit configured to receive the first control data; A second reception unit for receiving the first control data transmitted from the transmission unit of the control device, wherein the first control data received by the second reception unit and a detection result of the second detection unit And a second control device that performs a second control using the second control data processed in response to the second control data. The transmitting device of the first control device includes:
The first control data is simultaneously transmitted to the first receiving means and the second receiving means, and the first control device performs control independently of the second control device, thereby performing data communication. It is a control device. According to the present invention, the first control device and the second control device which perform mutually different controls such as various electronic control devices of an automobile use common control data, respectively. The control amount is calculated, and the actuator and the like are controlled. For this reason, the first control device on the transmission side of the control data is provided with a transmission means for transmitting the control data to the second control device, and the control data once transmitted from the transmission means to a transmission line or the like is provided. First receiving means for receiving, first storing means for storing the control data received by the first receiving means, and first storing means for performing first control using the control data stored in the first storing means. 1 control means and the like are provided. On the other hand, the second control device comprises a second receiving means for receiving control data from the first control device;
A second storage means for storing the control data received by the receiving means, and a second control means for performing a second control using the control data stored in the second storage means. Therefore, during data transmission from the second control device to the first control device, or during data communication between the first control device and another control device other than the second control device, the second control device transmits the second control device to the second control device. After the communication request to the control device is generated and the data communication from the first control device to the second control device is performed after the communication of the first control device is completed, the first control device may perform data communication. The control data handled by one control means is the same data with no time lag because it is control data once transmitted from the transmission means to the second control device. In this way, even if a transmission delay occurs in the control data between the transmitting side and the receiving side, the handling timing can be matched, and the first control device and the second control device can perform the control operation in cooperation. it can. FIG. 1 is a block diagram for explaining an embodiment of the present invention. In the plurality of control devices C1 and C2 mounted on the automobile, the control device C1 is, for example, a control device of the automatic transmission 11, and the control device C2 is a fuel injection valve 1
2 and a control device of the igniter 13. Therefore, the detection results of the vehicle speed detector S1 and the throttle valve opening detector S2 are input to the control device C1, for example.
Further, the detection results of the intake pressure detector S3 and the rotation speed detector S4 are input to the control device C2. Control device C
1 is a vehicle speed detector S1 and a throttle valve opening detector S
The automatic transmission 11 is controlled in response to the detection result from the control unit 2 so as to attain the optimum gear position. The control device C2 calculates a fuel injection amount and an ignition timing in response to a shift instruction from the control device C1 input via the intake pressure detector S3, the rotational speed detector S4, and the line K1. The fuel injection amount from the valve 12 is controlled, and the ignition timing of the ignition plug 14 is controlled via the igniter 13. Therefore, in the control device C1, in the processing circuit Ua realized by a microcomputer or the like,
When the speed change instruction data is generated as indicated by reference numeral A1, the line K is transmitted to the communication circuit T as indicated by reference numeral A2.
2, a transmission request is output. In response to the transmission request, the communication circuit T implemented by an integrated circuit or the like transmits the shift instruction data to the communication circuit R in the control device C2 via the line K1 as indicated by reference numeral T1. Send. In the communication circuit R implemented by an integrated circuit or the like, when the shift instruction data is received as indicated by reference numeral R1, the processing circuit Ub receives the data in the memory as indicated by reference numeral B1 via the line K3. Is stored in The processing circuit Ub is realized by a microcomputer or the like, similarly to the processing circuit Ua, and performs internal combustion based on the detection results of the detectors S3 and S4 and the shift instruction data transmitted from the control device C1 as described above. The fuel injection valve 12 and the igniter 13 are controlled so as to be optimal for the load state of the engine and the gear position of the automatic transmission. The control device C1 transmits the shift instruction data once sent to the line K1 as described above to the line K4.
As shown by the reference numeral T2. The shift instruction data thus captured is stored in a memory in the processing circuit Ua as indicated by reference numeral A10 via the line K5. The processing circuit Ua switches the shift speed of the automatic transmission 11 according to the shift instruction data thus stored. The communication line K1 also has a line K
Control devices C3 and C4 are connected to the control devices C3 and C4, respectively. The control device C3 is, for example, a control device for a suspension hydraulic pressure of an automobile, and the control device C4 is a traction control device for controlling torque distribution to each wheel. The control devices C1 to C4 communicate with each other via the line K1. From the control device C1 to each control device C
Control data corresponding to the control content of each of the control devices C2 to C4 is transmitted to 2 to C4. FIG. 2 is a flowchart for explaining the data transmission operation from the control device C1 to the control device C2. In response to the detection results of the detection circuits S1 and S2, it is determined in step n1 that the gear position of the automatic transmission 11 should be switched, and when shift instruction data is generated, in step n2, the shift instruction data is determined. Is sent. In step n3, the control device C1 and the control device C
It is determined whether or not it is time to transmit data depending on whether data communication is not performed with the control device C3 or C4, or whether data communication is performed from the control device C2 to the control device C1. If not, this step n3 is repeated, and when it is time to transmit, the process proceeds to step n4 where the speed change instruction data is stored in line K.
1 to the control device C2. When the data is transmitted in this manner, the transmitted shift instruction data is received by the control device C1 at step n5, and stored at step n6. At step n7, the automatic transmission 11 is actually controlled in accordance with the stored shift instruction data. Therefore, the control device C1 does not control the automatic transmission 11 at the time when the shift instruction data is generated, but fetches the shift instruction data actually transmitted to the control device C2 again. Since the control of No. 11 is performed, the data fetch timings of the control device C1 and the control device C2 can be matched. Thus, the control devices C1 and C2 can be operated in a coordinated manner. As described above, according to the present invention, the first control device, which is the transmission side of the control data, once receives the data actually transmitted from the transmission means, or When the data transmission is detected, the control data is taken in to perform the first control. For example, during the data transmission from the second control device to the first control device, or when the first control device and the second control device are transmitted. During the data communication with another control device other than the first control device, the first control device is not affected by the transmission delay as would be caused when a request for transmission of control data from the first control device to the second control device occurs. And the second control unit, which receives the control data and performs the second control, can match the data handling timing. Thus, the first control device and the second control device can operate in cooperation.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram for explaining an embodiment of the present invention. FIG. 2 is a flowchart for explaining the operation of the embodiment shown in FIG. 1; FIG. 3 is a block diagram for explaining a typical conventional technique. [Description of Signs] 11 Automatic transmission 12 Fuel injection valve 13 Igniters C1 to C4 Control devices K1 to K7 Line R, T Communication circuit S1 Vehicle speed detector S2 Throttle valve opening detector S3 Intake pressure detector S4 Rotation speed detector Ua, Ub processing circuit

Claims (1)

(57) [Claim 1] A transmitting means for transmitting first control data processed in response to a detection result of the first detecting means, and the second control data transmitted from the transmitting means. A first receiving unit for receiving the first control data, and performing a first control using the first control data received by the first receiving unit.
A control unit; and a second reception unit that receives the first control data transmitted from the transmission unit of the first control unit. The first control data received by the second reception unit and the second reception unit receive the first control data. A second control device performing a second control using the second control data processed in response to a detection result of the second detection means, the control device performing a data communication, wherein the first control The transmitting means of the device transmits the first control data to the first receiving means and the second receiving means at the same time, and the first control device performs control independently of the second control device. A control device that performs data communication.