JPH05268664A - Controller implementing data communication - Google Patents

Abstract

PURPOSE:To attain cooperative control by making data processing timing coinci dent between controllers implementing control through the use of common control data by means of communication. CONSTITUTION:A controller C1 at a data transmission side again fetches data which are once sent to a controller C2 through a line K1 and stores the data to control an automatic variable speed device 11. Then the data processing timing of the controller C1 and that of a controller C2 receiving variable speed command data via the line K1 and storing the data for the control are made coincident and the controllers C1, C2 are operated in cooperation. Thus, when a transmission request of the variable speed command data is generated from the controller C1 to the controller C2 and even when the communication with controllers C3, C4 or the communication from the controller C2 to the controller C1 is implemented and a transmission delay of the variable speed command data due to the communication takes place, the data processing timing between the controllers C1 and C2 is made coincident.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is preferably implemented in various electronic control devices mounted on an automobile, and performs common control data communication among a plurality of control devices, and individually uses the control data. The present invention relates to a control device that controls the.

[0002]

2. Description of the Related Art FIG. 4 is a block diagram for explaining a typical prior art. In a plurality of control devices c1 and c2 mounted on an 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 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. Has been entered. Control device c1
Is a vehicle speed detector s1 and a throttle valve opening detector s2
In response to the detection result from the automatic transmission 1, the automatic transmission 1 is controlled so that the optimum shift speed is achieved. Further, the control device c2 controls the intake pressure detector s3, the rotation speed detector s4, and the line k.
The fuel injection amount and the ignition timing are calculated in response to a shift instruction from the control device c1 input via the fuel injection valve 2
The fuel injection amount from the fuel cell is controlled, and the ignition timing of the spark plug 4 is controlled via the igniter 3.

Therefore, in the control device c1, in the processing circuit ua realized by a microcomputer or the like,
When the gear 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.
A transmission request is output via 2. In response to the transmission request, the communication circuit t realized by an integrated circuit or the like sends 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 realized by an integrated circuit or the like, when the gear shift instruction data is received as indicated by reference numeral r1, the processing circuit ub stores the same in the memory as indicated by reference numeral b1 via the line k3. Memorized in. The processing circuit ub is realized by a microcomputer or the like like the processing circuit ua, and based on the detection results of the detectors s3, s4 and the shift instruction data transmitted from the control device c1 as described above, the internal combustion engine The fuel injection valve 2 and the igniter 3 are controlled so as to be optimum for the load condition of the engine and the gear stage of the automatic transmission.

[0004]

In the prior art as described above, the gear shift instruction data generated as indicated by reference numeral a1 is immediately stored in the memory in the processing circuit ua as indicated by reference numeral a10. After being taken in, the automatic transmission 1 is shift-controlled. On the other hand, in order to control the fuel injection valve 2 and the igniter 3 in the control device c2, the control device c1, c will be used before the shift instruction data is used.
A data transmission delay between the two causes a shift.

The transmission delay becomes significant when another control device such as c3 and c4 is connected to the line k1 and these control devices c3 and c4 also receive data from the control device c1. .. The control device c3 is
For example, a device that controls the hydraulic pressure of the suspension,
The control device c4 is a traction control device that controls the torque distribution to each wheel.

In this way, the plurality of control devices c2 to c4 are
When the control data from the control device c1 is received, the data transmitted via the line k1 includes the address data designating each of the control devices c2 to c4 and each control device c.
2 to c4 and the control data individually corresponding to each other. When such data is sequentially designated and transmitted to the control devices c2 to c4, for example, even if a transmission request to the control device c2 is made, the control device c2 will be transmitted.
When the data transmission to the terminal is finished, it is necessary to wait until the next transmission timing again, which causes the above-mentioned transmission delay. In particular, when priority is assigned to each of the control devices c2 to c4, the frequency of occurrence of the transmission delay becomes high in the control device having a lower priority.

When the control devices c2 to c4 perform bidirectional communication, for example, the control devices c1 to c
Even if a transmission request to the control device 2 occurs, the control device c2
When data is being transmitted from the control device to the control device c1,
You have to wait until the transmission is finished.

As described above, when the data transmission delay occurs, for example, when the control device c1 outputs a gear shift instruction for increasing the speed reduction ratio, the shift timing of the automatic transmission 1 is delayed. Control device c2
Will start the ignition timing retard control, resulting in a deceleration shock. In this way, each control device c1
When c4 performs multiplex communication and tries to control using common control data, due to the transmission delay as described above,
The handling timing of the control data is deviated, and the coordinated operation cannot be performed.

An object of the present invention is to provide a control device for performing data communication that can match the control data handling timings.

[0010]

SUMMARY OF THE INVENTION The present invention includes a first control device for performing a first control, and a second control device for performing a second control using control data transmitted from the first control device. In the first control device, the first control device transmits the control data to the second control device, the first reception device receives the control data transmitted from the transmission device, and the first reception device receives the control data. First storage means for storing control data;
A first control means for performing the first control using control data stored in the first storage means;
The control device stores second control means for receiving the control data from the first control device, second storage means for storing the control data received by the second reception means, and second storage means for storing the control data in the second storage means. And a second control means for performing the second control by using the control data stored therein.

According to the present invention, the first control device for performing the first control and the second control device for performing the second control by using the control data transmitted from the first control device include the first control device. The control device transmits the control data in response to the detection result of the detection device, the transmission device transmitting the control data to the second control device, the detection device detecting the transmission of the control data from the transmission device. When detected, first storage means for storing control data to be transmitted from the transmission means, and first control means for performing the first control using the control data stored in the first storage means The second control device includes a receiving unit that receives control data from the first control unit, a second storage unit that stores the control data received by the receiving unit, and a storage unit that stores the control data in the second storage unit. Use control data A controller for data communication, characterized in that it comprises a second control means for said second control Te.

[0012]

According to the present invention, the first control device and the second control device, which perform different controls from each other, such as various electronic control devices of an automobile, calculate control amounts using common control data, Controls actuators, etc. For this reason, the first control device, which is 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 transmitted. First receiving means for receiving, first storage means for storing control data received by the first receiving means, and first control using the control data stored in the first storage means 1 control means and the like are provided.

On the other hand, the second control device includes second receiving means for receiving control data from the first control device, and the second receiving device.
It is configured to include second storage means for storing the control data received by the receiving means and second control means for performing the second control by using the control data stored in the second storage means.

Therefore, during the data transmission from the second control device to the first control device or during the data communication between the first control device and the other control devices other than the second control device, the first control device can perform the second control. Even if data communication is performed from the first control device to the second control device after a communication request to the control device is generated and the communication of the first control device is completed, The control data handled by one control means is the control data once transmitted from the transmission means to the second control device, and is therefore the same data with no time lag. In this manner, even if the transmission delay occurs in the control data on 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 with each other. it can.

In the first control device, instead of the first receiving means, a detecting means for detecting the transmission of the control data from the transmitting means is provided, and the first storing means is arranged to transmit the control data by the detecting means. When detected, the control data transmitted from the transmission means may be stored.

[0016]

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 the fuel injection valve 1.
2 and an igniter 13 control device. Therefore, for example, the detection results of the vehicle speed detector S1 and the throttle valve opening detector S2 are input to the control device C1,
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
In response to the detection result from No. 2, the automatic transmission 11 is controlled so that the optimum shift speed is achieved. In addition, the control device C2 calculates the fuel injection amount and the ignition timing in response to the shift instruction from the control device C1 input via the intake pressure detector S3, the rotation speed detector S4, and the line K1, and the fuel injection is performed. The fuel injection amount from the valve 12 is controlled, and the ignition timing of the spark 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 gear 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.
A transmission request is output via 2. In response to the transmission request, the communication circuit T realized by an integrated circuit or the like sends 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 realized by an integrated circuit or the like, when the gear shift instruction data is received as indicated by reference numeral R1, the processing circuit Ub stores the data in the memory as indicated by reference numeral B1 through the line K3. Memorized in. Like the processing circuit Ua, the processing circuit Ub is realized by a microcomputer or the like, and based on the detection results of the detectors S3 and S4 and the gear shift instruction data transmitted from the control device C1 as described above, the internal combustion engine is operated. The fuel injection valve 12 and the igniter 13 are controlled so as to be optimum for the load condition of the engine and the gear stage of the automatic transmission.

Further, the control device C1 sends the speed change instruction data once sent to the line K1 as described above to the line K4.
Capture as indicated by reference numeral T2. The shift instruction data thus fetched is stored in the memory in the processing circuit Ua as indicated by reference numeral A10 via the line K5. The processing circuit Ua switches the shift stage of the automatic transmission 11 in accordance with the shift instruction data thus stored.

The communication line K1 also includes a line K.
Control devices C3 and C4 are connected via 6 and K7, respectively. The control device C3 is, for example, a suspension hydraulic pressure control device for an automobile, and the control device C4 is a traction control device that controls 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 control device C2 to C4 is transmitted to 2 to C4.

FIG. 2 is a flow chart 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 stage of the automatic transmission 11 should be changed, and when gear shift instruction data is generated, the gear shift instruction data is generated in step n2. Request is generated. At step n3, the control device C1 and the control device C
3, it is determined whether or not it is a timing at which data can be transmitted, depending on whether data communication is not being performed with C4 or whether data is being transmitted from the control device C2 to the control device C1. Otherwise, this step n3 is repeated, and when it becomes the transmittable timing, the process moves to step n4 and the shift instruction data is changed to the line K.
1 to the control device C2.

When the data is transmitted in this way, the transmitted gear shift instruction data is received by the control device C1 in step n5 and stored in step n6. In step n7, the automatic transmission 11 is actually controlled according to the stored gear shift instruction data.

Therefore, the control device C1 does not control the automatic transmission 11 at the time when the gear shift command data is generated, but takes in the gear shift command data actually transmitted to the control device C2 again and the automatic transmission Since the control of No. 11 is performed, the data acquisition timings of the control device C1 and the control device C2 can be matched. This allows the control devices C1 and C2 to operate in cooperation.

FIG. 3 is a block diagram for explaining the structure of another embodiment of the present invention, which is similar to the above-mentioned embodiment and the same reference numerals are given to corresponding parts. In this example,
In the communication circuit Tc, as indicated by reference numeral T2c,
When it is detected that the shift instruction data is output to the line K1 via the line K4c, a trigger signal is output to the memory of the processing circuit Uc via the line K5c. As a result, the memory stores the gear change instruction data generated as indicated by reference numeral A1 through the line K6c and the reference numeral C10.
Capture as indicated by. Also in this case, the data handling timings of the control devices C1 and C2 can be matched.

[0024]

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 detects the data transmission. At that time, the control data is fetched and the first control is performed. Therefore, for example, during data transmission from the second control device to the first control device, or other control devices other than the first control device and the second control device. The first control and the control without being affected by a transmission delay that occurs when a request for transmission of control data from the first control device to the second control device occurs during data communication with It is possible to match the data handling timing with the second control of the second control device performed by receiving the data. As a result, the first control device and the second control device can be operated in cooperation with each other.

[Brief description of 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.

FIG. 3 is a block diagram for explaining another embodiment of the present invention.

FIG. 4 is a block diagram for explaining a typical conventional technique.

[Explanation of symbols]

 11 automatic transmission 12 fuel injection valve 13 igniter C1 to C4 control device K1 to K7; K4c, K5c, K6c line R, T; Tc communication circuit S1 vehicle speed detector S2 throttle valve opening detector S3 intake pressure detector S4 rotation Speed detector Ua, Ub; Uc processing circuit

Claims (2)

[Claims] 1. A first control device for performing first control, and a second control device for performing second control using control data transmitted from the first control device, wherein the first control device comprises: A first storage unit for storing the control data received by the first receiving unit; a first receiving unit for receiving the control data transmitted from the transmitting unit; Means and a first control means for performing the first control using the control data stored in the first storage means, wherein the second control device receives the control data from the first control device. Second receiving means for receiving, second storage means for storing control data received by the second receiving means, and second control for performing the second control using the control data stored in the second storage means 2 control means are included. Control device for data communication. 2. A first control device for performing first control, and a second control device for performing second control using control data transmitted from the first control device, wherein the first control device is Transmitting means for transmitting the control data to the second control device, detecting means for detecting transmission of the control data from the transmitting means, and transmission of the control data is detected in response to a detection result of the detecting means. And a first storage unit for storing control data to be transmitted from the transmission unit, and a first control unit for performing the first control using the control data stored in the first storage unit, The second control device is stored in the receiving means for receiving the control data from the first control device, the second storing means for storing the control data received by the receiving means, and the second storing means. Using the control data A control device for performing data communication, comprising a second control means for performing second control.