JPH0196450A - Engine controller - Google Patents

Abstract

PURPOSE:To reduce cost and to simply regulating work by connecting drive sources of a plurality of control operation means arranged on an engine to a single central processor. CONSTITUTION:Output from a two-cycle engine E is improved through opening control of a control valve and changeover control valves arranged in central portions of main and sub tail pipes 7, 9, and exhaust noise can be lowered in low speed operating zone. A servo motor 14 for driving the control valve 4 and a servo motor 18 for driving the changeover control valves are controlled through a single central processing section 20. Consequently, cost can be reduced and regulating work is facilitated because regulation only through the central processing section 20 is required.

Description

[Detailed description of the invention] A1 Purpose of the invention (1) Industrial application fields The present invention relates to an engine control device.

(2) Prior Art Conventionally, the intake and exhaust systems of an engine are provided with a plurality of control operating means, and the operation of these control operating means is generally controlled by individual central processing units.

(3) Problems to be Solved by the Invention If each control operating means is operated and controlled by a separate central processing unit as in the above-mentioned conventional method, the cost will not only be high (but also the adjustment work will be complicated). Become.

The present invention has been made in view of the above circumstances, and provides an engine control device that reduces costs and simplifies adjustment work by controlling the operations of a plurality of control actuation means with a single central processing unit. The purpose is to provide

B1 Structure of the Invention (1) Means for Solving Problems According to the present invention, the drive sources of the plurality of control actuation means provided in the engine are connected to a single central processing section.

(2) Effects According to the above configuration, it is possible to reduce costs by controlling multiple control actuating means with a single central processing unit, and moreover, only the adjustment of the single central processing unit is required, so adjustment work is required. It also becomes easier.

(3) Examples Examples of the present invention will be explained below with reference to the drawings.
First, in FIG. 1 showing a first embodiment of the present invention, the inner surface of a cylinder 1 in a two-stroke engine mounted on a motorcycle has a piston 2 slidably fitted into the cylinder 1 that opens and closes. An exhaust port 3 is opened, and a control valve 4 as a first control actuating means is provided above the exhaust port to control the opening/closing timing of the exhaust port 3.
will be placed. Also, an exhaust pipe 5 connected to the exhaust port 3
consists of a first tube section 5a whose downstream end is enlarged in diameter, and a truncated conical second tube section 5b whose large diameter end is connected to the downstream end of the first tube section 5a. An expansion chamber 6 is provided at the downstream end and within the second pipe portion 5b. This expansion chamber 6 is connected to a muffler 8 via a main tail pipe 7, and furthermore, the downstream end of a sub tail pipe 9 whose upstream end is connected to the second pipe portion 5b to open in the middle part of the expansion chamber 6 is also muffled. connected to the device 8.

Moreover, switching control valves 10, 11 (see FIG. 2) as second and third control actuating means are disposed at an intermediate portion between the main tail pipe 7 and the auxiliary tail pipe 9.

The control valve 4 provided at the exhaust port 3 is fixed to a drive shaft 12 rotatably disposed on the cylinder 1, and this drive shaft 12 is driven via a transmission mechanism 13 consisting of a pulley, a transmission belt, etc. It is connected to a servo motor 14 as a source. Further, the servo motor 14 includes a servo motor 140.
A potentiometer 15 is attached to detect the operating amount, that is, the opening degree of the control valve 4.

In FIG. 2, the switching control valve 10.11 is rotatably fixed to a common drive shaft 16 passing through the main and auxiliary tail pipes 7.9. The servo motor 18 is connected to a servo motor 18 as a drive source through a transmission mechanism 17 consisting of a transmission mechanism 17, and a potentiometer 19 is attached to the servo motor 18 for detecting its operating amount, that is, the opening degree of the switching control valve 10.11.

Moreover, the switching control valves 10.11 are mounted to the drive shaft 16 at different angles, and the reswitching control valves 10.11 rotate at different opening degrees in response to the rotation of the drive shaft 16. do.

Both servo motors 14, 18 are connected to a common central processing section 20, and detection values of an engine rotation speed detector 21 and a throttle opening degree detector 22 are input to the central processing section 20, respectively.

Furthermore, the central processing unit 20 stores the target opening degree of the control valve 4, that is, the target rotation amount θ0 of the drive shaft 12, according to the engine speed Ne and the throttle opening degree θ,H. is set as shown in FIG. 3, and the target rotation amount θ7□ of the drive Ij[h16 according to the engine speed Ne is set as shown in FIG. 4. That is, when the engine speed Ne is low, both the opening degree of the switching control valve 11 in the sub tail pipe 9 and the opening degree of the switching control valve 10 in the main tail pipe 9 become small, as shown in FIG. 2(a). The rotation amount of the drive shaft 16 is set as follows, and the engine rotation speed N
When e is medium speed, as shown in Fig. 2(b),
The switching control valve 11 in the auxiliary tail pipe 9 becomes fully open, and the switching control valve 1 in the main tail pipe 7 opens completely.
The rotation amount of the drive shaft 16 is set so that the opening degree of 0 becomes small, and when the engine rotation speed Ne is high, the second
As shown in Figure (C), the amount of rotation of the drive shaft 16 is set so that the opening degree of the switching control valve 11 in the auxiliary tail pipe 9 becomes small and the opening degree of the switching control valve 100 in the main tail pipe 7 becomes fully open. be done.

In the central processing unit 20, control is performed according to the main routine shown in FIG. 5 and the interrupt subroutine shown in FIG. 6. First, in the main routine shown in FIG. Rotation amount θ77 of shaft 12.16. θ7. is loaded.

In the next second step S2, θv+>θ7. +ε1 is judged, and if θI11>θa and +ε1, lθ7. The drive shaft 12 is rotated to drive the control valve 4 to the open side by -θVll, and the second
In step S2, θ9. ≦θ7. +ε8, the process advances to the fourth step S4, and in this fourth step S4, θ
v1〈θ1. −ε, is determined.

When it is determined in the fourth step S4 that θv1<θa, -ε, the process proceeds to the fifth step S5.
5, the drive shaft 12 is rotated by 1θ□−θ9− to drive the control valve 4 toward the closing side. That is, the second step S2
to the fifth step S5, the amount of rotation θ9 of the drive shaft 12
．． The rotation amount of the drive shaft 12 is controlled so that the rotation amount is within plus or minus ε2 of the target rotation amount θ11.

In the fourth step S4, θ9. ≧θ1. -ε, and when the processing of the third or fifth step S3 to S5 is completed, the process advances to the sixth step S6,
In step S6, it is determined whether θvt<θa2+ε2, and if θ9□<θ□2+ε2, the seventh
In step S7, the drive shaft 16 is driven to the high speed operation side by 1θ9□−θ721, and in the sixth step S2, when θ7□≧θa2+ε2, the process proceeds to eighth step S8, and in this eighth step S8, θvz>θ It is determined whether or not A2-ε2. When it is determined in the eighth step S8 that θ, 2>θa2-ε2, the process proceeds to the ninth step S9, and in this ninth step S9, the drive shaft 16 is driven to the low speed side by 1θ9□-θa21. . That is, from the sixth step S6 to the ninth step S9, the amount of rotation of the drive shaft 16 is controlled such that the amount of rotation θv2 of the drive shaft 16 is within plus or minus ε2 of the target amount of rotation θa2.

When θ9□≦θa2−ε2 in the eighth step S8, or when the processing in the seventh or ninth step S7˜S9 is completed, the process returns to the first step S1.

The interrupt subroutine shown in FIG. 6 is calculated by interrupting the main routine at regular intervals, and in the first step N1, the engine speed Ne and the throttle opening θ are calculated.
The target rotation amount θa of the rotation shaft 12 is searched based on the TRI, and in the second step N2, the target rotation amount θ7□ of the rotation shaft 16 is searched based on the engine rotational speed Ne.

Next, to explain the operation of this embodiment, by controlling the opening degree of the control valve 4 according to the rotation speed and throttle opening degree of the two-stroke engine E, the output of the two-stroke engine E is lowered to the left in FIG. It increases as shown by the diagonal line. Furthermore, by controlling the opening degree of the switching control valve 10.11 according to the engine speed, the output of the two-cycle engine E increases as shown by the diagonal line downward to the right in FIG.

That is, in the medium speed operating range of the two-stroke engine E, the opening degree of the switching control valve 11 in the auxiliary tailpipe 9 becomes large and the opening degree of the switching control valve 10 in the main tailpipe 7 becomes small, so that the auxiliary tailpipe Exhaust gas stagnates in the expansion chamber 6 on the rear side of the connection port 9, which lowers the temperature inside the expansion chamber 6, changes the speed of the exhaust pulsation wave, and improves the output in the medium speed operating range. .

Furthermore, in the low-speed operating range, the opening degrees of both reswitching control valves 10 and 11 are reduced, which makes it possible to significantly reduce exhaust noise.

In this way, the control valve 4 and the reswitching control valve 10.11
By controlling the opening degree of the servo motor 14 for driving the control valve 4 and the reswitching control, The servo motors 18 for driving the valves 10.11 are controlled by a single central processing unit 20, which not only makes it possible to reduce costs, but also allows the use of a single central processing unit 20. Since it is only necessary to adjust, the adjustment work becomes easy.

8, 9, and 10 show a second embodiment of the present invention, and parts corresponding to those in the first embodiment are given the same reference numerals.

A communication pipe 23 is fitted and fixed to the small diameter end, that is, the downstream end, of the second pipe portion 5b of the exhaust pipe 5, and the outer end of the communication pipe 23 is connected to the muffler 8. A truncated conical reflection tube 24 serving as a control operation means for reflecting positive pressure waves generated by exhaust gas toward the exhaust boat 3 is disposed within the second tube portion 5b. This reflection tube 24 is arranged in the second tube section 5b with its large diameter end facing the first tube section 5a, and the collar 25 fitted on the small diameter end of the reflection tube 24 is arranged around the outer circumference of the communication tube 23. It is slidably fitted into the

A servo motor 26 as a drive source whose operation is controlled by the central processing unit 20 is connected to the reflection tube 24 via a transmission mechanism 27 . That is, in the second pipe part 5b, the drive shaft 2 is attached to the bearing part 28 provided on the upper outer surface of the large diameter end.
9 is rotatably supported, and its drive shaft 29 and reflection tube 2
The driven shaft 30 installed on the large diameter end of the connecting rod 31
The transmission mechanism 27 is connected to the drive shaft 29. Further, in order to allow the connecting rod 31 to swing, a long hole 32 and a notch 33 extending in the generatrix direction are provided at the upper part of the large diameter end of the second tube portion 5b and the reflection tube 24. According to this configuration, the connecting rod 31 swings in response to driving the drive shaft 29, thereby causing the reflecting tube 24 to connect to the communicating tube 2.
Slide along 3.

A potentiometer 34 is attached to the servo motor 26, and the potentiometer 34 detects the position of the reflection tube 24, that is, the amount of rotation of the drive shaft 29, and this detected amount is input to the central processing section 2o.

The central processing section 20 controls the opening degree of the control valve 4 as well as the position of the reflection tube 24 according to the engine speed, as in the first embodiment. As shown in FIG. 11, a target amount of rotation of the drive shaft 29 is set to drive the reflection tube 24 in a direction that increases the capacity of the expansion chamber 6 in proportion to the engine speed.

According to this second embodiment, the output of the two-stroke engine E increases as shown in FIG. That is, by controlling the opening and closing of the control valve 4, the output is increased as shown by the diagonal line downward to the left, and by controlling the movement of the reflection tube 24, the output is increased in the low and medium speed rotation ranges as shown by the diagonal line downward to the right. can be fulfilled. Furthermore, since the servo motor 14 of the control valve 4 and the servo motor 26 of the reflection tube 24 are controlled by the common central processing unit 20, it is possible to reduce costs and simplify the adjustment work as in the first embodiment. .

FIG. 13 and FIG. 14 show a third embodiment of the present invention, in which a pair of on-off valves 35 and 36 as control actuation means can be opened and closed in the second pipe portion 5b of the exhaust pipe 5. will be placed. These opening/closing valves 35 and 36 are each formed in a substantially semicircular shape so as to form a substantially circular shape when both valves are closed, and are pivotably supported in parallel to the second pipe portion 5b. It is fixed to the drive shaft 37,38. Moreover, the redrive shafts 37.38 are connected via a link mechanism 39, and the redrive shafts 37.38, that is, the on-off valves 35.36
open and close in conjunction with each other. A servo motor 40 as a drive source for driving these drive shafts 37 and 38 is connected to a transmission mechanism 4.
The servo motor 40 is connected to one drive shaft 37 via the servo motor 1, and a potentiometer 42 is attached to the servo motor 40.

The servo motor 40 is controlled by a central processing section 20 that controls the opening degree of the control valve 4, and the detected amount of the potentiometer 42 is also input to the central processing section 20. A target amount of rotation of the drive shaft 37.degree. 38 is set in the central processing section 20, as shown in FIG. 15, in order to control the operation of both on-off valves 35, 36 according to the engine speed. That is, when the engine rotational speed is low to a certain rotational speed, the on-off valves 35 and 36 are closed, and when the engine rotational speed exceeds the certain rotational speed, both on-off valves 35 and 36 are opened.

According to this third embodiment, the output of the two-stroke engine E increases as shown in FIG. 16. That is, by controlling the opening and closing of the control valve 4, the output is increased as shown by the diagonal line downward to the left, and by controlling the opening and closing of the control valves 35 and 36, the output is increased in the low and medium speed operating range as shown by the diagonal line downward to the right. It is possible to increase the amount.

Moreover, as in the first and second embodiments, the control valve 4 and the on-off valves 35 and 36 are controlled by the central processing section 20, so that cost reduction and adjustment work can be simplified.

Other embodiments of the invention include FIGS. 1, 8 and 1.
As shown by the chain line in FIG. 3, the control valve 4 and the capretor 45 or the oil pump 46 may be controlled by the central processing section 20.

C0 Effects of the Invention As described above, according to the present invention, the drive sources of the plurality of control actuation means provided in the engine are connected to a single central processing section, so that costs can be reduced without providing multiple central processing sections. In addition, the adjustment work is simplified because only one central processing unit is required.

[Brief Description of the Drawings] Figures 1 to 7 show a first embodiment of the present invention, in which Figure 1 is an overall schematic diagram, and Figure 2 is an enlarged cross-section along the line ■-■ in Figure 1. Large cross-sectional view Figure 3 is a diagram showing the target rotation amount of the drive shaft of the control valve, Figure 4 is a diagram showing the target rotation amount of the drive shaft of the switching control valve,
Fig. 5 is a flowchart showing the control procedure of the main program in the central processing unit, Fig. 6 is a flowchart showing the control procedure of the interrupt subprogram in the central processing unit, Fig. 7 is an output characteristic diagram, and Figs. 8 to 12 8 shows a second embodiment of the present invention, FIG. 8 is an overall schematic diagram, and FIG. 9 is a general schematic diagram.
The figure is a cross-sectional view taken along the line IX-IX in Figure 8, Figure 10 is a cross-sectional view taken along the line X-X in Figure 9, Figure 11 is a diagram showing the target rotation amount of the drive shaft of the reflection tube, and Figure 12 is the output. The characteristic diagrams and FIGS. 13 to 16 show a third embodiment of the present invention, in which FIG. 13 is an overall schematic diagram, FIG. 14 is a sectional view taken along the line XIV-XIV in FIG. 13, and FIG. FIG. 16, which is a diagram showing the target amount of rotation of the drive shaft of the on-off valve, is an output characteristic diagram. 4... Control valve as control actuation means, 10.11...
- Switching control valve as control actuation means, 14.1B. 26.40... Servo motor as a drive source, 20.
...Central processing unit, 24...Reflector tube as control actuation means, 35.36...Opening/closing valve E as control actuation means.
・2-stroke engine

Claims (1)

[Claims] An engine control device characterized in that drive sources for a plurality of control operating means provided in an engine are connected to a single central processing section.