JPH11229923A - Control data switching circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control data switching circuit coping with changes in large controlled variables. SOLUTION: When a controlled data 1 is taken as a controlled data whose controlled value is small, a controlled data whose controlled value is further smaller is taken as a controlled data 4. When switching request (a) is entered, a switching timing generation section 5 generates a switching signal (b) to control a 4→1 selector 6. The 4→1 selector 6 outputs controlled data 1-4 to a switching controlled section. The 4→1 selector 6, when switching the controlled data 1 to a controlled data 2, selects a controlled data 3 for a constant time, and when switching the controlled data 2 to the controlled data 1, selects the controlled data 4 for a constant time. The switching timing generation section 5 transmits the switching signal (b) synchronized with the read-out timing of memories 1-4 in replay to the switching request from an external section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control data switching circuit, and more particularly to a control data switching circuit having improved response at the time of switching control data.

[0002]

2. Description of the Related Art Conventionally, for example, in the case of fuel control of an engine or the like, two different control data (for example, when the load is large and the rotational speed is high and when the load is small and the rotational speed is low) are stored in a memory. In some cases, a controlled part (for example, an engine or the like) is controlled by one of the data. FIG. 5 shows an example of such a case.

In the circuit shown in FIG. 5, when switching between two control data (for example, a fuel injection amount table corresponding to a rotation speed and a load) held in a memory (for example, a ROM; read only memory), control is performed. Data (memory; ROM) (elements) 1 and 2 store data for controlling the controlled part.

That is, as shown in FIG. 4, control data 1 and 2 for performing minute control are written in memories 1 and 2 at each unit time. Note that the control data 1 and 2 generally have different control contents.
In FIG. 5, the switching request a for the control data 1 and 2 is a switching signal for switching the control data itself which is generated when a large control (for example, engine output switching) is required that cannot be handled by a minute control.

The switching timing generator 5 generates a switching signal b synchronized with the timing of reading from the memories 1 and 2. The 2 → 1 selector 6 switches between the control data 1 and 2 by the switching signal b from the switching timing generator 5 and sends out the control data to the controlled unit (not shown).

[0006]

The operation when switching from control data 1 to control data 2 or from control data 2 to control data 1 in the conventional example shown in FIG. 5 will be described with reference to FIGS. FIG. 6 is a waveform diagram showing a switching state of the control data. While the controlled part is operating by the control data 1, a switching request a1 is generated at an irregular time from outside. On the other hand, at time A synchronized with the read timing of the memory, switching c from control data 1 to control data 2 occurs.

Next, the switching request a at an irregular time
2 occurs, and at the time D, a switch d from the control data 2 to the control data 1 occurs.
However, since the controlled part usually has a time constant, it cannot respond to a sudden change in control data, and a delay occurs in the response. That is, as shown in FIG. 7, at time A, the control data is switched from control data 1 to control data 2. However, the actual operation of the controlled part has a delay e with respect to the control input. .

[0008] Similarly, the switching operation f at time D is finally achieved at time F. Thus, there is a disadvantage that the actual operation shows a delayed response to a sudden change in the control value (data).

An object of the present invention is to provide a control data switching circuit that can respond to a large change in the control amount.

[0010]

A control data switching circuit according to the present invention is a control data switching circuit for switching a control data to control a controlled part, wherein the control data switching signal is supplied based on a switching request from outside. Switching timing generating means for generating the control data, control data selecting means for switching the control data based on the switching signal, and controlling the control data selecting means so as to emphasize the control data for a certain time after the switching timing of the control data. Control data enhancing means.

When the control data has a relatively large control value, the control data is paired with the control data having a larger control value. When the control data has a relatively small control value, the control data is smaller. It is characterized by being paired with control data having a value.

Still further, the control data enhancing means includes:
When the control data is selected, the control data having a larger or smaller control value in the pair for a certain period of time is first selected, and then the control data to be selected is selected.

Still further, the control data is data for controlling the engine, and the control data having a relatively large control value and the control data having a relatively small control value respectively have a large load and a high rotational speed. Is a fuel injection amount table corresponding to the rotation speed and the load corresponding to the control data when the rotation speed is high and the load is small and the rotation speed is low.

The operation of the present invention is as follows. Control data having a control value slightly larger than the control data having the larger control value is prepared. Similarly, control data having a control value slightly smaller than the control data 1 having a smaller control value is prepared. When switching from control data with a small control value to control data with a large control value, instead of directly switching to control data with a large control value,
Select control data slightly larger than large control data.

After a certain period of time, switching back to large control data is performed. Conversely, when switching from large control data to small control data, control data 4 having a control value a little smaller than the small control data for a certain time is selected, and after a certain time, the control data 4 is returned to the small control data.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of a control data switching circuit according to the present invention, and the same parts as those in FIG. 5 are denoted by the same reference numerals. In FIG. 1, control data 1 to 4 are memories (for example, ROM elements), and control data (for example, a fuel injection amount table corresponding to a rotation speed and a load) for controlling a controlled part (for example, an engine or the like; not shown). Etc.) 1 to 4 are stored. Assuming that the control data 2 is control data having a larger control value (when the load is large and the rotation speed is high), the control data having a slightly larger control value is set as the control data 3.

If the control data 1 is control data with a smaller control value (when the load is small and the number of revolutions is low), control data with a still smaller control value is set as control data 4. (Engine output state) When the switching request a is input, the switching timing generator 5 generates a switching signal b for controlling the 4 → 1 selector 6. 4 → 1
The selector 6 switches the control data 1 to 4 and outputs the control data to the controlled unit.

The 4 → 1 selector 6 selects the control data 3 for a certain time when switching from the control data 1 to the control data 2, and selects the control data 4 for a certain time when switching from the control data 2 to the control data 1. The switching timing generator 5 responds to a switching request a from outside by using a memory 1 to
4, the switching signal b synchronized with the read timing is transmitted.

The operation of the embodiment of the present invention will be described with reference to FIG. In FIG. 2, first, control data 3 having a slightly larger control value than control data 2 is prepared. Similarly, control data 4 having a control value slightly smaller than control data 1 is also prepared. When switching from control data 1 to control data 2 at time A, control data 3 having a control value slightly larger than control data 2 is selected from time A to time B, instead of directly switching to control data 2 g I do.

Thereafter, at time B, control data 2 is switched back to h. Conversely, at time D, when switching from control data 2 to control data 1 is performed, time D
From time t to time E, control data 4 having a control value slightly smaller than control data 1 is selected i, and then control data 1 is returned to control data 1 at time E j.

The switching timing in this case will be described in detail with reference to FIG. In FIG. 3, during control data operation (engine rotation control), a data transmission timing of a memory and an asynchronous switching request (engine output increase switching; from control data 1 to control data 2) a are generated from outside. In response, at time A, a control data 3 selection signal synchronized with the read timing is transmitted. After a predetermined time, at time B, the control data 2 selection signal is sent out to perform switching back.

When a switching request a in the reverse direction (engine output drop switching; from control data 2 to control data 1) a is generated, a control data 4 selection signal is transmitted at time D synchronized with the memory read timing. After a certain period of time, at time E, a control data 1 selection signal is sent out to perform switchback.

As described above, according to the present invention, when switching from control data 1 to control data 2 or switching from control data 2 to control data 1 (engine state switching), overshoot data or undershoot data , The response speed of the controlled unit can be increased, and the controlled unit can be quickly stabilized in a required state.

[0025]

As described above, the present invention provides, for example,
At the point where control data with a large difference between the two control amounts is switched, a control value larger than the expected operation value,
Alternatively, by inputting a control value smaller than the expected operation value, the response of the controlled unit can be made faster and the response speed can be adjusted by the inserted control value.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 2 is a waveform diagram illustrating an example of control data according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram illustrating an example of control data switching according to an embodiment of the present invention.

FIG. 4 is a waveform chart of an example of control data.

FIG. 5 is a block diagram of a conventional control data switching circuit.

FIG. 6 is a waveform diagram of an example of conventional control data.

FIG. 7 is a diagram illustrating an example of an operation of a conventional controlled unit.

[Explanation of symbols]

 1-4 control data 5 switching timing generator 6 4 → 1 selector

Claims (7)

[Claims] 1. A control data switching circuit for switching a control data to control a controlled part, comprising: a switching timing generating means for generating a switching signal for the control data based on a switching request from the outside; Control data switching means for switching the control data based on the control data, and control data emphasis means for controlling the control data selection means so as to emphasize the control data for a certain time after the timing of switching the control data. Data switching circuit. 2. The control data switching circuit according to claim 1, wherein said control data is stored in a recording device in a form of a control table. 3. The control data switching circuit according to claim 2, wherein said recording device is a read-only memory element. 4. When the control data has a relatively large control value, it is paired with control data having a larger control value, and when the control data has a relatively small control value, the control data is smaller. 4. The control data switching circuit according to claim 1, wherein said control data switching circuit is paired with control data having a value. 5. The control data emphasizing means, when the control data is selected, first selects control data having a larger or smaller control value in the pair for a certain period of time, and then selects the control data to be selected. 5. The control data switching circuit according to claim 1, wherein the control data switching circuit selects: 6. The control data switching circuit according to claim 1, wherein the controlled part is an engine, and the control data is control data for the engine. 7. The control data having a relatively large control value and a control data having a relatively small control value, respectively, when the load is large and the rotation speed is high, and when the load is small and the rotation speed is low. 7. The control data switching circuit according to claim 6, wherein the control data switching circuit is a fuel injection amount table corresponding to the number of rotations and the load corresponding to.