JPS6355343A - Fuel quantity controller for engine - Google Patents

Abstract

PURPOSE:To make optimal control corresponding to an operating mode, by correcting a referential limit mode signal being set on the basis of rotation corresponding to the operating mode and an actual rotation according to the operating mode and a deviation between commanded rotation and the actual rotation. CONSTITUTION:A comparison difference signal DELTAS between an engine rotation setting command signal Sv fed from a steering wheel 1 and an actual rotation signal SR of an engine 14 is inputted to a speed regulation mode compensation circuit 5 and a function generator 12. Based on the actual rotation and the position of steering wheel, an operating mode selection circuit 4 decides an operating condition such as normal operation, quick reverse operation, wild weather operation or low speed operation, and produces a rotation Sv which is set corresponding to a selection signal Ss and the operating mode. A fuel limit mode correction circuit 13 corrects a fuel quantity referential limit mode signal fed from a referential limit mode setting circuit 7 and based on an operating mode rotation SN and the actual rotation, corresponding to a correction signal DELTASM selection signal Ss which corresponds to the comparison difference signal DELTAS fed from the function generator 12.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device capable of controlling the amount of fuel supplied to an engine, and in particular, the present invention relates to a device that can control the amount of fuel supplied to an engine, and is particularly suitable for use in a speed control/control device for a diesel engine. Regarding a control device.

[Conventional technology]

Generally, a mechanical, mechano-hydraulic, or electric speed governor is mainly used as a means for controlling the amount of fuel supplied to an engine, particularly a diesel engine, and controlling its speed.

These speed governors have a predetermined unique fuel amount limit mode, but they have problems with control control in low speed ranges and under transient conditions, and they also have problems in preventing overloading of the engine. The limit mechanism for this purpose was fixed and linear, and did not suit the actual situation of the engine.

Therefore, conventionally, the fuel fl't of the engine as shown in FIG.
A control device is used.

That is, by shaking the control handle 1 provided in the steering room, the engine speed setting command signal Sv is output, and this engine speed setting command signal Sv
is sent to the microcomputer 2A, and its comparator 3
is compared with the actual rotational speed signal SR from engine I.

By the way, this microcomputer 2A has a built-in operation mode selection circuit 4, and the rotation speed information of the W1 function and the handle position information of the control handle 1 are input to this operation mode selection circuit 4. As a result, the engine is currently in ocean operation (normal operation), rapid reversal, and rough weather operation.

It is possible to determine whether the engine is in one of the low rotational speed operating states.

In other words, tI! It is possible to distinguish between the low rotation operating state and the ocean operating state of the rotation speed function of the i-section, and the rough-weather operation state of the Wi-section can be determined from the amount of rotation modification 9JI of the Iso-sen. The rapid reversal of the engine can now be determined from the handle position.

After the various driving modes are discriminated and detected by the driving mode selection circuit 4, a selection signal Ss corresponding to each driving mode is output.

Note that the operation mode selection circuit 4 also outputs a signal SN corresponding to an ideal engine speed that is preset according to each operation mode.

The deviation signal Se from the comparator 3 is sent to the regulating mode compensation circuit 5.
In this governor mode V compensation circuit 5, compensation according to the unselected operation mode is performed by the governor mode corresponding to the operation mode selected by the operation mode selection circuit 4. There is. In other words, this speed governor mode compensation circuit 5 receives the selection signal S from the operation mode selection circuit 4.
s, determines the speed control mode, and compensates the deviation signal Se according to the speed control mode.

As shown in FIG. Sent to vessel 6.

Note that: The switching of the speed governing mode during rapid reversal by the 14-speed mode compensation circuit 5 is carried out after the operation of the control handle 1 and while the fuel supply to the engine I is being powered off. Switching of the speed control mode of the operation mode is performed when the rotation speed deviation becomes zero after the condition is detected.

By the way, the microcomputer 2A has a reference limit mode (as shown in FIG. 17) that is common to each operation mode.
A reference limit mode setting circuit 7 is built in, which sets the engine speed according to the operation mode selected from the operation mode selection circuit 4. By receiving the signal SN, a standard limit mode signal SL corresponding to the amount of fuel to be limited (R natural fuel amount) corresponding to the engine speed signal SN is generated.
This can be done by sending the fuel amount limit mode correction circuit 8 to the fuel amount limit mode correction circuit 8.

The fuel metering correction circuit 8 receives the selection signal Ss from the operation mode selection circuit 4 and changes the reference limit mode signal SL according to the selected operation mode, as shown in FIG. A limit correction signal SN from this circuit 8 is sent to a comparator 6, and the signal Sc is corrected in terms of fuel amount depending on the operating mode.

In this way, the comparator 6 outputs a signal S proportional to the fuel amount, as shown in FIG.
, is sent to the comparator 9.

The signal from this comparator 9 is sent to the 7 actuator 10 for driving the fuel W4 adjustment rack in the fuel injection pump of engine I, and by moving this actuator 10''ch fuel adjustment rack, the signal is sent to the engine I. The fuel supply will be carried out.

Fuel 3 associated with driving the actuator 10! The amount of fuel is detected as a displacement position of the I-alignment rack. This detection signal S
DE is the fuel amount compensation circuit 1 in the feedback line FB
At 1, the electric signal SFf, ? , and can be input to the comparator 9. In other words, since the set value and the actual value are compared, the comparator 6
Therefore, it is possible to compensate for the signal SP from.

Therefore, the operation signal SD compensated by the signal S is finally supplied from the comparator 9 to the 7-channel cutter 10.

In addition, multi-axis 8! In the case of Seki, the comparator 9 is connected to another institution (
For example, a feedback signal S, 'MS,'' from an actuator for the engine (2, DI) is also applied.

In this way, according to the engine fuel amount control device shown in Figure #6, 8! Problems caused by mechanical, mechano-hydraulic, or electric speed governors are eliminated.

[Problem that the invention seeks to solve, α]

However, in the conventional engine fuel amount control device as described above, the reference limit mode correction circuit 8 corrects the reference limit mode signal SL using the selection signal Ss from the operation mode selection circuit 4, and the reference limit mode signal SL is corrected by the comparator 6. 17
The correction signal SM is sent, but the correction amount of the fuel amount limit mode correction circuit 8 with respect to the reference limit mode signal SL is always constant (not variable, only the n forward rotation speed is measured, and the direction of the correction is It is fixed only in the direction of decreasing the amount, and when the selection signal Ss is interrupted, it returns to the original reference limit amount.Furthermore, the reference limit mode signal S in the reference limit mode setting circuit 7
The setting of L is performed only for the engine speed signal SN set in advance in the operation mode selection circuit 4.

Therefore, when the disturbance conditions (waves, foam, etc.) on a ship change rapidly (such as during stormy weather), the acceleration of the engine speed decreases, as in case a (see the X mark) shown in Figure 9. Sometimes I put it away. However, FIG. 9 is a graph showing the results obtained from an actual ship test of the engine speed state when the engine is reversed, and is shown for three cases IL-e. Further, for each case a to c, the initial velocity and smoke color effect (Lindlemann density) are shown in the graph.

As shown in Figure 9, cases b and c (each marked with an ○).

In some cases, good results can be obtained using the same device (see Figure 6), such as with the Δ mark (see figure 6), but considering the situation like case a, it is necessary to It is desired to expand the limit function accordingly, that is, to be able to set the maximum fuel amount flexibly.

In view of this situation, the present invention provides appropriate compensation according to the operating mode and expands the limit function, thereby making it possible to perform optimal control over a wide operating range of the engine. 8! The purpose of the present invention is to provide a fuel quantity control device for fuel consumption.

[Means for solving problems]

Therefore, the fuel amount control device for an engine of the present invention is a control device that can control the amount of fuel to the engine based on the engine speed setting command signal from the control handle. A comparator that performs comparison with the rotational speed signal, a governor mode compensation circuit that receives the comparison difference signal from the comparator and compensates the fuel amount control signal to the engine, and selects the operating mode. At the same time, there is an operation mode selection circuit that outputs an engine rotation speed signal according to the selected operation mode, and a reference limit mode for fuel amount according to the engine rotation speed signal from the operation mode selection circuit and the earth mud actual rotation speed signal. A reference limit mode setting circuit that outputs a signal,
Limit correction for correcting the signal from the governor mode compensation circuit by correcting the fuel amount reference limit mode signal from the reference limit mode setting circuit according to the operation mode selected in the operation mode selection circuit. a fuel ffi'J limit mode correction circuit provided to output a signal; a function generator receiving a comparison difference signal from the comparator; The present invention is characterized in that it is configured to output the limit correction signal in response to the correction signal of the limit correction signal.

[For production]

In the engine fuel setting @Vcr11 of the present invention described above, the reference limit mode signal of the fuel amount according to the engine rotation speed signal from the operation mode selection circuit and the engine actual rotation speed signal is
The reference limit mode signal is outputted from the reference limit mode setting circuit to the fuel quantity limit mode correction circuit, and in the fuel quantity limit mode correction circuit, the reference limit mode signal is corrected according to the operation mode selected in the operation mode selection circuit. r! A limit correction signal is output in response to a correction signal output from the A number generator corresponding to the comparison difference signal. Then, the signal from the regulating mode compensation circuit is corrected using this limit correction signal.

〔Example〕

Below, a fuel amount control system for an engine as an embodiment of the present invention will be explained with reference to the drawings. Fig. 1 is a block diagram thereof, Fig. 2 is a graph showing the input/output characteristics of the function generator, and Fig. 3 is a graph showing the input/output characteristics of the function generator. is a graph showing the reference limit mode (fuel amount-rotational speed characteristic), FIG. 4 is a graph showing the correction status of the fuel amount-rotational speed characteristic in the fuel amount limit mode correction circuit, and FIG. b) is a big rough for comparing and explaining the operation of the apparatus according to this embodiment and the operation of the conventional apparatus.

As shown in Figure ts1, by operating the control handle 1 provided in the wheelhouse, the engine speed setting command signal S
v is output, and this engine rotation speed setting command signal Sv is sent to the micro combinator 2 as a control device.

In this microcomputer 2, a comparator 3 compares the engine rotation speed setting command signal Sv with the actual rotation speed signal SR of the engine 14 and outputs a comparison difference signal ΔS.
is built-in, and an operation mode selection circuit 4 is also built-in.

The operation mode selection circuit 4 discriminates the operation mode and outputs a selection signal Ss corresponding to the selected operation mode, and also outputs a fi1m rotational speed signal SN preset according to the operation mode. The operation mode selection circuit 4 has all the same functions as the conventional circuit shown in Figure 6, and a detailed explanation thereof will be omitted.

On the other hand, the microcomputer 2 has a built-in speed control mode compensation circuit 5 and a reference limit mode setting circuit 7, and the speed control mode compensation circuit 5 receives the comparison difference signal from the comparator 3, as in the conventional case. Engine 14% due to ΔS
It receives the selection signal Ss from the operation mode selection circuit 4, determines the speed control mode, performs E compensation on the comparison difference signal AS according to this speed control mode, and outputs the signal Se. is output to the comparator 6.

Further, the reference limit mode setting circuit 7 has a reference limit mode (common to each operation mode) as shown in FIG.
The reference limit mode signal (fuel quantity-rotational speed characteristic) of the fuel amount is set in advance based on the above-mentioned reference limit mode according to the engine rotational speed signal SN from the operation mode selection circuit 4 and the actual rotational speed signal SR. Electrical signal corresponding to the maximum fuel amount that should be limited in response to the rotational speed signal 5NtSR) SL
This outputs the following.

In addition, in the reference limit mode setting circuit 7, the actual rotation speed signal SR is selected as the rotation speed signal used when setting the reference limit mode signal SL in a low speed range or under excessive disturbance conditions, and in other cases. As before, the engine speed signal SN is selected.

Further, the actual rotational speed signal SR is detected by a sensor (not shown) attached to the engine 14. By the way, in this embodiment, the microcomputer 2 has built-in a function generator 12 and a fuel quantity limit correction circuit 13, and the function generator 12 receives the comparison difference signal ΔS from the comparator 3. The correction signal ΔSM based on the graph shown in FIG. 2 is output in response to the second comparison difference signal ΔS. ' Also, the fuel amount limit mode correction circuit 13 adjusts the reference limit mode signal S from the reference limit mode setting circuit 7 in response to the selection signal Ss from the operation mode selection circuit 4.
According to the positive signal ΔSM from the function generator 12, the reference limit mode signal SL is corrected as shown in FIG. 4, and then output to the comparator 6 as a limit correction signal SM. It is something to do.

In the comparator 6, the fuel amount limit mode correction circuit 1
The signal Sc from the speed control mode compensation circuit 5 is corrected based on the limit correction signal SM from the comparator 3, and the final operation signal So is output from the comparator 6 to the cutter 10, thereby reducing the fuel supply to the engine 14. The amount is controlled.

Since the engine fuel amount control device as an embodiment of the present invention is configured as described above, by operating the feed handle 1, the engine speed setting command signal Sv is output, and the engine speed setting command signal Sv is output. The command signal Sv is sent to engine 1 by comparator 3.
The comparator 3 outputs a comparison difference signal JS to the regulating mode compensation circuit 5 and the function generator 12, respectively.

At this time, the operation mode selection circuit 4 determines the selected operation mode, and outputs a selection signal Ss to the governor mode compensation circuit 5 and fuel amount limit mode correction circuit 13 in accordance with the operation mode. With,
An engine speed signal SN corresponding to the above-mentioned operation mode is output to the reference limit mode setting circuit 7.

Then, in the governor mode compensation circuit 5, a governor mode is determined based on the selection signal Ss from the operation mode selection circuit 4, and compensation for the comparison difference signal aS is performed corresponding to this governor mode, and the signal Sc is output to the comparator 6.

On the other hand, in the reference limit mode setting circuit 7, the third
Based on the standard limit mode (fuel amount-rotational speed characteristic) as shown in the figure, it corresponds to the actual rotational speed times SR in the low speed range or under excessive disturbance conditions, and under other conditions, the operation mode selection circuit 4 In response to the engine speed signal SN from
The reference limit mode signal SL corresponding to the fuel amount to be limited (maximum fuel amount) is fuel amount 17 Mitsuto mode correction circuit 1
Output to 3.

Further, in the function generator 12, a correction signal lSM is outputted to the fuel quantity limit mode correction circuit 13 in response to the comparison difference signal js from the comparator 3 based on the input/output characteristics as shown in FIG.

Here, as shown in Fig. 2, when the engine starts, the actual rotational speed signal S, is Orpm, so the value of the comparison difference signal ΔS becomes large, and the value of the correction signal ΔSH also becomes large, and when the engine is rotating in the normal direction, 14 is started in reverse, the correction signal ΔSM further increases. On the other hand, when speeding up, the comparison difference signal ΔS
Since the value of ASM gradually decreases, the correction signal ASM will also gradually decrease.

Then, in the fuel amount limit mode correction circuit 13, the reference limit mode signal SL from the reference limit mode setting circuit 7 is corrected according to the selection signal Ss from the operation mode selection circuit 4, and this reference limit mode signal SL
is corrected as shown by the broken line in FIG. 4 in accordance with the correction signal ΔSH from the function generator 12 and output to the comparator 6 as the limit correction signal SN. In this comparator 6, the signal Sc from the speed control mode compensation circuit 5
is corrected by the limit correction signal SH from the fuel amount limit mode correction circuit 13, and then outputted to the actuator 10 as an operation signal SO, and by driving this actuator 10, the amount of fuel to the engine 14 is controlled. It is.

As shown in FIG. 4, the fuel quantity limit mode correction circuit 13 can not only decrease but also increase the fuel quantity correction amount based on the correction signal ΔSM from the function generator 12. Furthermore, in addition to correcting the fuel amount, the corrected rotation speed can also be changed by the selection signal Ss, as in the conventional case.

As a result, the amount of fuel during acceleration, which used to be as shown in Figure 5 (b), has changed to that shown in Figure 5 (a), and the engine speed is smoothly accelerated. It turns out.

As described above, according to Heseki's fuel amount control device of this embodiment,
In a low speed range or under excessive disturbance conditions, the reference limit mode signal SL is set not by the engine rotation speed signal SN but by the actual rotation speed signal SR that corresponds to the actual operating state of the engine 14, and in addition, the fuel amount limit mode correction circuit At step 13, the reference limit mode signal SL is corrected to increase or decrease based on the correction signal ΔSM from the function generator 12.

Therefore, the limit HPt function can be expanded, that is, the maximum fuel amount can be set flexibly. Since the optimum fuel control is always achieved, excess fuel is not only reduced, but also
The smoke color is improved and the engine speed acceleration characteristics are also improved.

In addition, it is possible to reliably set the fuel input amount for normal starting or reverse starting at 11 HVF, and it also greatly improves operability, such as preventing overtorque and supercharger surging, and improving controllability during rough weather operation. There is also the effect that it can be done.

In addition, in this example, the case of a basic single-shaft engine was shown, but
The device of the present invention is similarly applicable to multi-axis rock anchors.

Further, in this embodiment, the selection signal Ss is sent from the operation mode selection circuit 4 to the governor mode compensation circuit 5, but the governor mode compensation circuit 5 is also provided with an operation mode selection function. The line for the selection signal Ss between the speed governor mode compensation circuit 5 and the operation mode selection circuit 4 may be omitted.

〔Effect of the invention〕

As described in detail above, according to the engine fuel amount control device of the present invention, the control device can control the fuel amount to the engine based on the fi function rotation speed setting command signal from the steering wheel. Setting command signal and 8! A comparator that compares the actual rotational speed signal of the engine, a governor mode compensation circuit that receives the comparison difference signal from the comparator and compensates the fuel amount control signal to the engine, and selects the operating mode. and an operation mode selection circuit that outputs an engine rotation speed signal corresponding to the selected operation mode, and a reference limit mode for fuel amount according to the engine rotation speed signal from the operation mode selection circuit and the actual rotation speed signal. a reference limit mode setting circuit that outputs a signal; and a governor mode compensation circuit that corrects the fuel amount reference limit mode signal from the reference limit mode setting circuit according to the operation mode selected in the operation mode selection circuit. a fuel amount limit mode correction circuit provided to output a limit correction signal for correcting the signal from the comparator, and a function generator for receiving a comparison difference signal from the comparator; Since the limit mode correction circuit is configured to output the limit correction signal in response to the correction signal from the function generator, appropriate compensation is performed according to the operation mode, and the limit HPI function is expanded. The speed governing condition, that is, the setting of the fuel amount is always optimal in response to disturbances and over a wide operating range of the engine, and appropriate fuel control is realized. Therefore, not only excess fuel is reduced, smoke color is improved, and engine speed acceleration characteristics are also improved.

In addition, the fuel input amount can be set reliably during normal starting or reverse starting, and operability can be greatly improved by preventing overtorque and supercharger surging, as well as improving controllability during rough weather operation. There are some advantages to doing so.

-

[Brief explanation of the drawing]

Figures 1 to 5 show the fuel amount system according to an embodiment of the present invention. :!
g device, Fig. 1 is its block diagram, Fig. 2 is its block diagram.
Figure 3 is a graph showing the input/output characteristics of the function generator, Figure 3 is a graph showing its reference limit mode (fuel amount vs. rotation speed characteristics), and Figure 4 is a graph showing the fuel amount vs. rotation speed in the fuel amount limit mode correction circuit. A graph showing the modification status of numerical characteristics,
FIGS. 5(a) and 5(b) are bisigraphs for comparing and explaining the operation of the device according to this embodiment and the conventional device, respectively, and FIGS. Fig. 6 is a block diagram of the device, Fig. 7 is a graph showing its standard limit mode (fuel amount-rotational speed characteristics), and Fig. 8 is a graph showing the fuel amount in the fuel amount limit mode correction circuit. FIG. 9 is a graph showing the modification status of the rotation speed characteristic, and is a graph showing an example of actual ship test results (during operation) of the conventional device. 1. Vertical kneading handle, 2. Microcomputer as a control device, ≦.. Comparator, 4. Operating mode selection circuit, 5. Governor mode compensation circuit, 6. Comparator, 7.
Reference limit mode setting circuit, 10. Actuator, 12. Function generator, 13. Fuel amount limit mode correction circuit, 14. Engine. Representative Patent Attorney Yoshi Iinuma 4 Fig. 2 Fig. 3 Fig. 5 (b) Time Fig. 6 Fig. 7 Rotation speed WJ9 Fig.

Claims (1)

[Claims] In a control device capable of controlling the amount of fuel to an engine based on an engine rotation speed setting command signal from a control handle, a comparator that compares the engine rotation speed setting command signal with an actual engine rotation speed signal; A governor mode compensation circuit receives a comparative difference signal from the engine and compensates the fuel amount control signal to the engine, and selects an operation mode and outputs an engine rotation speed signal according to the selected operation mode. an operation mode selection circuit; a reference limit mode setting circuit that outputs a fuel amount reference limit mode signal according to the engine rotation speed signal from the operation mode selection circuit and the actual rotation speed signal; and the operation mode selection circuit. Provided to output a limit correction signal for correcting the signal from the governor mode compensation circuit by correcting the fuel quantity reference limit mode signal from the reference limit mode setting circuit according to the selected operation mode. A function generator is provided, the function generator having a fuel quantity limit mode correction circuit configured to receive a comparison difference signal from the comparator; A fuel amount control device for an engine, characterized in that it is configured to output a limit correction signal.