JPS6143244A - Control device of engine - Google Patents

Abstract

PURPOSE:To ensure stable drivability of an engine in no relation to its environmental difference of use and/or aged deterioration, by driving a throttle valve in accordance with its opening calculated by a result comparing a target value determined on the basis of an accelerator opening with a detection value of the pressure in a cylinder. CONSTITUTION:Feedback correction control of a target value, obtaining in a target value arithmetic device 26 a target value Pm0 in accordance with an engine condition from an engine speed N and accelerator opening thetaa by an arithmetic operation or a table while in a target value correction arithmetic device 28 a correction coefficient alphamw, alpham correcting the Pm0, multiplies the Pm0 by these correction coefficients obtaining a value Pm1. Next, a control device, obtaining in a comparator 29 the ratio of alphap1 of Pmax to Pm1 while in a throttle valve driving opening arithmetic device 30 thetatm1a at this calculation time by multiplying thetatm1b at the preceding calculation time by the ratio alphap1, calculates a value DELTAthetatm1. Next the control device, transferring the value DELTAthetatm1 to a throttle valve driving gear 35 as a driving signal, drives a throttle valve in accordance with the value thetatm1. In this way, the control device, aligning Pmax to Pm1 and continually obtaining an equal pressure in a cylinder for the equal accelerator opening, enables an output to be stably controlled.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention detects a value correlated to the output generated by the engine, and controls the engine by driving a throttle valve so that the detected value becomes a target value. Regarding equipment.

(Prior art) - In the conventional Sorin W1 engine, the accelerator pedal is mechanically connected to the intake throttle valve that controls the engine output, and the intake throttle valve is controlled depending on the accelerator pedal position (hereinafter referred to as accelerator opening degree). The degree of opening of the engine, that is, the amount of intake air supplied to the engine, is determined, thereby making it possible to directly control the output of the engine.

In other words, taking an electronic control system as an example, in addition to the intake air amount determined in this way, the optimal fuel injection amount is set in advance in response to various operating variables such as engine speed and temperature. This fuel is injected by a fuel injection valve attached to the intake boat downstream of the throttle valve, forming a mixture with intake air that is supplied to the engine and also controls the output of the engine ( For example, refer to the ECC5L series engine technical manual published by Nissan Motor Co., Ltd. in June 1978).

(Problem to be solved by the invention) In such a device, the fuel supply amount is controlled based on the actual intake air amount determined according to the accelerator opening (i.e., the throttle valve opening), so the engine Due to differences in the usage environment (for example, temperature and atmospheric pressure) and changes over time, the engine output changes regardless of the driver's intention, even if the accelerator opening is constant.

Taking atmospheric pressure as an example, if the accelerator opening is the same at a high altitude as at a low altitude, the fuel injection amount will be reduced by the amount that the actual intake air amount is reduced, and the engine output will be reduced.

Therefore, in order to obtain the same engine output as in a lowland area, it becomes necessary to press the accelerator pedal many times, which may result in poor drivability.

Similarly, changes over time can cause fluctuations in engine output at the same accelerator opening, which may worsen drivability.

The present invention detects a value correlated to the engine output and controls the throttle valve opening so that this detected value matches a target value determined based on the accelerator opening. Control I that ensures stable drivability regardless of
The objective is to provide the equipment.

(Means for Solving the Problems) FIG. 1 is an overall configuration diagram for clearly showing the configuration of the present invention.

1 is a cylinder pressure detection means that detects the cylinder pressure of the engine.

Reference numeral 4 denotes target value calculating means, which calculates the cylinder pressure or its correlation from the accelerator opening degree θa detected by the accelerator distance detection means 2 and the engine rotation speed N detected by the rotation speed detection means 3. A target value Ps of the amount is calculated.

The comparison means 5 compares this P+a with the detected value P of the cylinder pressure.

The throttle valve drive opening calculation means 6 calculates the throttle valve drive opening based on the comparison result obtained by comparing P@ and P.

The valve drive hand R7 drives the throttle valve according to the throttle valve drive opening degree.

(Function) For example, when P is lower than PIll, the throttle valve opening is increased to increase the intake air amount in order to increase the engine output, and when P is higher than Pm, the intake air amount is increased in order to decrease the engine output. Reduce the amount of intake air by reducing the opening of the throttle valve. As a result, P is controlled to match Pa, and by performing feedback correction control on the target value based on the actual detected value, a constant engine output is always obtained according to the target value. .

(Embodiment) FIG. 2 is a schematic diagram of a first embodiment of the present invention, which is applied to an electronically controlled fuel injection engine.

Air is sucked in from the air cleaner 11 to remove dust, the intake air amount Qa is measured by the air meter 12, and the Qa is adjusted by the throttle valve 14 in the throttle chamber 13.

The air entering the intake manifold 15 is mixed with fuel injected from an injection valve 17 attached to an intake port 16 downstream of the throttle valve to form a mixture, and this mixture is supplied to each cylinder 18.

Reference numeral 21 is a rotation speed sensor such as a two-way angle sensor attached to the crankshaft of the engine, which detects the engine rotation speed N.

22 is an accelerator sensor that outputs a signal proportional to the accelerator opening θa.

Reference numeral 23 denotes a cylinder pressure sensor such as a spark plug washer type sensor using a piezo element (an element that utilizes a piezo effect), which detects the cylinder pressure P of each cylinder (or a representative cylinder).

In this case, specifically, the maximum value P of the front internal pressure is set as the target value.
Although wax, indicated mean effective pressure Pi, etc. can be used, in this example, Plx is used.

Reference numeral 35 denotes a throttle valve drive device, which is composed of a step motor, an angle sensor, etc., and drives the throttle valve 14 to open and close based on a drive signal given from the control unit 25.

The control unit 25 includes sensors 21, 22, 23
A drive signal is output to the throttle valve drive device 35 and the injection valve 17 based on the signal from the throttle valve drive device 35 and the injection valve 17.

FIG. 3 is a circuit diagram of the control unit 25.

In the figure, 26 is a target value calculator, and a rotation speed sensor 211.1
:1: Detected engine speed N and accelerator sensor 22
Based on the accelerator opening degree θa detected at , a basic target value corresponding to the driving state at that time is determined by calculation or table lookup.

This basic target value is the basic target value PII of the maximum value of cylinder pressure.
IO, and in this example, Pm, which is determined in advance.

is read out from the table shown in FIG.

Reference numeral 28 denotes a target value correction calculator which corrects PIIIO based on engine water temperature, etc., and obtains a final target value Pml using the following equation.

Pm1=αmtw”6m・Pmo…(1
) Here, aIIIll and αk are correction coefficients, and as aIDll and 6m increase, Pmo is corrected to increase.

Starting with αl, aIall is an increase correction coefficient for increasing the amount of fuel during the warm-up process, and is given by the following equation.

αmu+=Kmw・Ft−Kadv−(2
) (Kmw is a constant) Here, Ft is a water temperature increase correction coefficient that increases the amount of fuel as the engine water temperature decreases, and K adv is a retardation correction coefficient that retards the ignition timing when the engine water temperature is low. . Therefore, warm-up can be promoted by ffI.

Second, aIl+(a) is a correction coefficient during a transient period that is corrected according to the rate of change in the accelerator opening.

That is, since the accelerator opening degree change detector 27 detects the time change of ea (dea/clt), this d9a/d
Based on t, am is determined by the following formula.

ffm=1+Ke+-dθa/dt-(
3) (K is a constant) In general, α is a value that increases at the start of acceleration and decreases at the start of deceleration. Therefore, the responsiveness during the transient period is improved by the a function.

The comparator 29 compares PfflI with the maximum value Pll1ax (described later) of the cylinder pressure detected by the cylinder pressure sensor 23, and calculates the ratio ff11+ using the following equation.

ffp+=Pm+/Pmax-(4)
The throttle valve drive opening degree calculator 30 calculates the throttle valve opening degree θtm from this ffp using the following equation.

e tmla=K t+ ”Q p+ ”θtm,
b...(5) (Kt is a constant) Here, θtn+1 is determined at predetermined time intervals (for example, every 360° of a predetermined crank angle), and θtIIll
b%9tmla are etm calculated last time,
, represents etll calculated this time.

The throttle valve drive opening degree Δetm+ (=θtmla −9tmlb) is determined from these θtmla and 9tm+b.

The throttle valve driving device 35 operates according to the ΔeteaH obtained in this way.
The throttle valve 14 is driven accordingly.

Next, the basic injection amount calculator 32 calculates the air 70 - meter 12
The intake air amount Qa detected at 8! From the leap number N and the basic pulse width Tp (=to-Qa/N.

However, K is a constant).

The injection amount correction calculator 33 inputs various information obtained by detecting the state of the engine and various parts of the vehicle, corrects Tp, and obtains the actual injection pulse width Ti.

This Ti corresponds to the valve opening time of the injection valve, and the injection valve driving device 34 drives the injection valve 17 simultaneously in all cylinders - times per engine rotation based on this Tj.

Next, referring to the detection of P max input to the comparator 29, FIG. 6 is a circuit diagram of the P ll1ax detection means, which is applied to a four-cylinder engine.

The engine crank angle position detector (not shown) synchronizes with the engine rotation and generates a 720° signal for every 720° of crank angle (the crank angle required for 4 strokes of a 4-cylinder engine) and a 1° signal for every 1° of crank angle. Outputs a pulse signal.

50 is a crank angle position counter (
The POS counter) is reset by the rising edge of the 720° signal, and the rising and falling edges of the 1° signal are 9
The counter value is incremented by 1 each time. In addition, the ignition order is 1
-3-4-2, the 720° signal is set to rise at the compression top dead center of the No. 1 cylinder (see Figure 8).
.

51 is a frequency divider, which changes to 1 by the rising edge of the 720° signal.
is reset, and the counter value of the POS counter 50 becomes 1.
When the number becomes a multiple of 80, the counter value is increased by 1.

Reference numeral 52 denotes a multiplexer (M P That is, when the output value of the divider 51 is 1, the pressure signal of the No. 1 cylinder is output, and when the output value is 2, the pressure signal of the No. 3 cylinder, No. 3, No. 4 scent cylinder, No. 4, and No. 2 light cylinder is output. .

53 is a C counter that indicates the crank angle position from the compression top dead center of each cylinder, which is reset every time the output value of the frequency divider 51 changes, and is reset by 1 every time the 1° signal rises or falls.
Increment the counter value.

54 is analog/digital conversion B (A/D converter),
The output signal of the multiplexer 52 is A/D converted every time the counter value of the C counter 53 changes.

55 is a comparator, which outputs the A/D converted pressure value P and P wa
Compare the P ll1ax value stored in the x memory 56, and in the P wax memory 56, P
Set P to new P wax only if it is larger than x memory value
Rewrite as a memory value. That is, the extraordinary value of P is sequentially replaced in the P theory a× memory 56, thereby storing the maximum value P L6ax of the cylinder pressure during the expansion stroke. Note that the P*aX memory value in the memory 56 for Pma is cleared every time the output value of the frequency divider 51 changes, and
Remember wax.

The pmaxi memory 57 is a memory that stores the P wax memory value of each cylinder, and the memory value is rewritten when the output value of the branching unit 51 changes, and before clearing, the P wax memory value is stored.
The P wax memory values stored in the memory 56 are sequentially stored. In other words, P @ILX of the 1st cylinder is P'
+ axi (however, i=1 to 4), the branching unit 51
P wax 1 for the output value 1.2.3.4 order
, P wax 3, P wax 4, and P wax 2 are stored in this order.

The P wax of each cylinder detected in this way can be detected in the same way using a microcomputer, and FIG. 7 shows a 70-chart when executed by a microcomputer.

Here, 720° is executed every 720° of crank angle.
Signal synchronization program and 1 executed every 1° of crank angle
It consists of two types of programs: the signal synchronization program. Note that the timing of execution is synchronized with a signal from a crank angle position detector (not shown) of the engine.

The 720° signal rises at compression top dead center of the No. 1 cylinder, thereby executing the 720° signal synchronization program. That is, the POS counter value is cleared by the rising edge of the 720" signal (step 20).
,In addition,? The 20'' signal synchronization program takes precedence over the 1° signal synchronization program.

The 1° signal synchronization program is based on the fact that the compression top dead center of each cylinder in a 4-cylinder engine occurs every 180° of the crank angle.
It is executed with ° as one wheel position. Furthermore, since the crank angle position where P wax occurs is within 40° from compression top dead center, the cylinder pressure P is detected every time a 1° signal is input until 39° after compression top dead center, and this is calculated as a data value. Then, the maximum value PeaX is selected from among the stored data values. That is, steps 21 to 30
P is detected in steps 31 to 36, and P wax is determined in steps 31 to 36.

Specifically, the compression top dead center of each cylinder is when the POS counter value of the POS counter is 1.181,361.541, and the flag (FLAG) is set to start detecting P from this time. is set to 0 and the C counter is cleared (steps 22 and 24). Note that the POS counter starts counting at the rising edge of the 1° signal immediately after the reset signal (720° signal) is input, so the counter value is off by 1 at compression top dead center (see Figure 8). .

On Uni, FLAG is the analog value from the cylinder pressure sensor.
/D conversion is a flag that determines whether or not to perform A/D conversion.
D conversion is performed, and when it is 1, A/D conversion is not performed.

Note that if the ignition order is 1-3-4-2, it is possible to identify the cylinder at the same time as the compression top dead center is detected, and when the POS counter value of the POS counter is 1.181°361.541, The cylinder number 1.3.4.2 is stored in the cylinder number register (NCYL register) (step 23).

In this way, when the compression top dead center of a specific cylinder is determined, the channel of the A/D converter into which the pressure signal of the in-cylinder pressure sensor of each cylinder is input is selected according to the cylinder number at that time.
The conversion is performed and P is stored as a data value in the register at the C counter address (corresponding to the counter value of the C counter) (steps 26-28).

This storage of P continues until 39° after the compression top dead center, and when it reaches 40° after the compression top dead center, Pm1x is determined (step 29.30).

Next, in order to determine Pmax, Pma of the memory is
After setting the wax memory value to 0, this P s+ax
Compare the Pwax memory value in memory and the data value at the C counter address, and if the data value is much lighter, Pwa
x memory value is rewritten to a data value (step 31
~35).

Therefore, P i+ax, which is the maximum value among the data values, is stored in the PIIA× memory, and this P max is moved to the Pa+axi memory after P @ax is detected (step 34.36). In addition, i is NC
The cylinder number stored in the YL register, P++++ax
i represents P wax of the first cylinder.

P max thus determined is output to the comparator 29 in FIG.

In addition, instead of P IIIax, the indicated mean effective pressure Pi
You can also use For example, by detecting the cylinder pressure P near the top dead center of the pressure line where the most work is done during one cycle, a value corresponding to Pi of each cylinder may be adopted in a time-division manner.

Specifically, the configuration is as shown in FIGS. 9 and 10. In other words, the minute work L (=P・Δ■) obtained by multiplying P by the slight change ΔV in the Schilling volume at that time is integrated over the same predetermined crank angle (±60°) before and after the compression top dead center, and this is The value Σ(P・ΔV)/Vs divided by the cylinder volume Vs from the upper dead fish to the predetermined crank angle is adopted as the value corresponding to the indicated average effective pressure (step 40
~42.34.43).

However, in this case, the basic target value of the cylinder pressure to be compared must be the basic target value Pio of the indicated mean effective pressure, and an example of a table of Pio is shown in FIG.

The operation of the above configuration will be explained based on chart 70 in FIG. 4.

This control calculation is performed, for example, at regular intervals or in synchronization with the rotation of the engine, but will be described here assuming that it is performed once per engine rotation.

First, the injection amount control will be described. The injection amount control is performed in steps 8 to 11.

That is, in the basic injection amount calculator 32, from Qa and N to T
p (=−Qa/N, is a constant) is determined by calculation or table lookup (step 8).

The injection amount correction calculator 32 calculates a correction coefficient (
For example, find the water temperature increase correction coefficient (for example, to increase the water temperature when the water is not sufficiently increased), and set this correction coefficient to T.
Multiply p to find Ti (step 9.10).

In the injection valve driving device M34, the injection valve is driven to open by this Ti (step 11).

Therefore, when Qa increases, the injection amount increases accordingly, and the cylinder pressure increases.

Next, the feedback correction control of the target value based on the detected value of the cylinder pressure will be described. This control is performed in steps 1 to 7.

That is, the target value calculator 26 calculates Pmo according to the engine state at that time from N and Qa by calculation or table lookup (step 1).

The target value correction calculator 28 calculates a correction coefficient ffmw(=to+ew*Ft-Kadv, KIll) for correcting Pmo.
- is a constant), ffm (=1 10Km・dea/dt, K
m is a constant), and multiply PIIIO by these αI%aI6 to obtain Pm, (=αplow-・ffm-Pm
o) is determined (steps 2 to 4).

The comparator 29 calculates the ratio αp+ between P l11ax and Pm.
Find (=PJ / P +aax) (Ste mb5
).

In the throttle valve drive opening calculation unit 30, this αp1 is multiplied by 19t+@+b from the previous calculation to obtain 6tm+a(
=Kt+ -ffp+etm+bSKt+c 11) wo ab, ΔetIII+ (=θtm, a-θtmlb)
(Step 6.7).

The thus obtained Δ9tm is transferred to the throttle valve drive device 35 as a drive signal, and in the throttle valve drive device 35, Δ19
The throttle valve 14 is driven in accordance with tm+.

For example, if the actual detected value is higher than the target value, α
Since p1 times 1, Δθt1<0 from θtIIlla<θtmlb. In this case, the throttle valve drive device 35ζ,
The throttle valve opening degree is decreased by using the absolute value of Δetm+ as the opening degree for driving the throttle valve 14. Therefore, Qah' decreases, and depending on this decrease in Qa, control is performed to decrease the injection amount, thereby lowering Qpmax and approaching Pm+. On the other hand, if the actual detected value is lower than the target value, the throttle valve drive device 35 increases the throttle valve opening, thereby increasing P wax and approaching Pm.

In this way, P max becomes equal to Pm+, and the same cylinder pressure is always obtained for the same accelerator opening. In other words, the preset target value is not affected by differences in the usage environment or changes over time, and stable engine output can be controlled through such cylinder pressure control.

Note that the accelerator opening degree change detector 27 is added to improve drivability during transient times, and the basic configuration is satisfied even without this detector 27.

Therefore, instead of d(9a/dt), for example, the time change in the basic target value (dP mo/dt) may be determined.

FIG. 12 is a circuit diagram of the second embodiment of the present invention, and FIG. 13 is a 70-chart.

In this embodiment, while the first embodiment calculates the throttle valve opening based on the previous throttle valve opening, the basic throttle valve opening θtw
o? l! This e is determined in advance from the operating conditions of the first
The throttle valve opening degree is determined from tIIlO.

That is, the basic throttle valve opening degree calculator 40 calculates the basic throttle valve opening degree etwo from N and Qa by calculation or table lookup. Note that an example of the table is shown in FIG.

The throttle valve drive opening degree calculator 43 calculates the throttle valve opening degree 19tllz from this etmo using the following equation.

θj@2: K t2” ap2 'θtwo
-(6) (K ti is a constant) Here, ap2 is the ratio of the actual maximum value P max of the cylinder pressure to the target value Pm2 to the preset maximum value of the cylinder pressure, and the comparator 42 calculates the It is determined by the formula.

α112= P 1112/ P +aax
-(7) Note that the target value correction calculator 41 is Pmo
is corrected based on engine water temperature, etc., and the final target value PI112 is obtained.
is calculated using the following formula.

pm2 = (2B fist Pmo - ('8
) From this θtm2, the throttle valve drive opening degree Δθt+m2 is calculated as IRt.
>71 D. As in the first embodiment, it is sufficient to calculate the difference from the previous throttle valve opening, and the throttle valve driving device 43 drives the throttle valve 14 in accordance with Δet1112 thus calculated.

Note that the other parts are the same as those in FIGS. 3 and 4, and the same parts are given the same reference numerals and the explanation will be omitted.

This embodiment also has the same functions and effects as the first embodiment.

Furthermore, in this embodiment, since 9tmO is determined in advance for the operating conditions, even when the driver changes the operating conditions, θ and 0 immediately change, thereby further improving the responsiveness of the engine.

In the second embodiment, etmo is obtained from N and Qa, but it is also possible to obtain etmo from Pmo by calculation or table lookup. .

(Effects of the Invention) The present invention detects a value correlated to the engine output, and uses this detected value as a feedback signal to correct and control the throttle valve opening so that the detected value matches the target value. ,
It is possible to eliminate the effects of differences in the operating environment and changes over time on the engine output, and it is possible to always obtain the same engine output with the same accelerator opening.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram for clearly explaining the present invention. FIG. 2 is a schematic configuration diagram of the first embodiment of the present invention, FIG. 3 is a circuit configuration diagram of the control unit in FIG. 2, and 41!
I indicates the content of control by the control unit 70-
The chart in FIG. 5 is a diagram for explaining a table used for reading out the basic target value Pmo of the maximum value of the cylinder pressure. FIG. 6 is a circuit configuration diagram of the P wax detection means, FIG. 7 is a 70-chart showing control details when detecting P wax by a microcomputer, and FIG. 8 is a timing chart. Fig. 9 is a circuit diagram of the means for detecting the amount equivalent to Pi, Fig. 10 is a 70-chart showing the control details when detecting the amount equivalent to Pi with a microcomputer, and Fig. 11 is the basic target of the indicated mean effective pressure. FIG. 3 is a diagram illustrating a table used to read a value Pio. Fig. 12 is a circuit configuration diagram of a control unit according to a second embodiment of the present invention, Fig. 13 is a flowchart showing the control contents by the control unit, and Fig. 14 is used to read out the basic throttle valve opening f3 two. It is a figure explaining a table. DESCRIPTION OF SYMBOLS 1... Cylinder pressure detection means, 2... Accelerator opening detection means, 3... Rotation speed detection means, 4... Target value calculation means, 5... Comparison means, 6... Throttle valve drive opening calculation means;
7... Throttle valve driving means, 12... Air 70-meter,
14... Throttle valve, 17... Fuel injection valve, 21... Rotation speed sensor, 22... Accelerator sensor, 23... Cylinder pressure sensor, 25... Control unit, 26...
...Target value calculator, 27...Accelerator opening degree change detector, 28.41...Target value correction calculator, 29.42...
・Comparator, 30.43... Throttle valve drive opening degree calculator, 32
... Basic injection amount calculator, 33... Injection amount correction calculator, 34... Injection valve drive device, 35... Throttle valve drive device, 40... Basic throttle valve opening degree calculator. Fig. 5 Basic value of cylinder pressure control Pmo (kg
/cm”) Fig. 6 Fig. 13 Fig. 14 Basic throttle valve M/l θtmo (de!l
) Procedural amendment dated November 6, 1985 1, Indication of the case Patent Order No. 164589 of 1989 2, Name of the invention Authority control device 3, Person making the amendment Relationship with the case Patent applicant address Yokohama, Kanagawa Prefecture Name of No. 2 Takaracho, Kannayo-ku, City (3
99) Nissan Motor Co., Ltd. 4, Agent 5, Date of amendment order Voluntary action 6, Subject of amendment 7, Contents of amendment (1) Amend the "Claims" of the specification as attached - Page 1, No. On the 18th line, "drive the throttle valve" is corrected to "control the output of the engine". (3) On page 4, line 3 [based on accelerator opening]
The statement "based on the operating conditions of the engine" should be corrected. (4) In the 4th line of the 4th page, the phrase ``Control the throttle valve opening'' is corrected to ``Control the output of the 8!1 valve.'' (5) From line 13 to line 15 of page 4 [Accelerator opening detection means 2 detects j from the engine rotation detected by the engine operating condition detection means 1] operating conditions (e.g. accelerator opening ea and engine speed N)
Based on the above. On page 4, line 20, "throttle valve drive opening calculation means" is corrected to "means for controlling engine output." From page 5, line 1 to line 2, "throttle valve drive ``Calculate the opening degree.'' is corrected to ``Control the engine output.'' (8) From the 3rd line to the 4th line of page 5 [The throttle valve driving means 7... is driven]. ” will be deleted. (9) From the 7th line to the 8th stroke on page 5 [Increase the throttle valve opening to increase the amount of intake air, and replace j with ``Wi''
(for example, by increasing the opening of the throttle valve to increase the amount of intake air). (10) On page 5, from line 9 to line 10, “・
In order to lower ..., reduce the throttle valve opening and reduce the amount of intake air. '' should be corrected to ``drive the means for controlling the output of the engine in order to reduce... (for example, reduce the amount of intake air by reducing the opening of the throttle valve).'' (11) On page 16, line 15 of the same page, “Indicated mean effective pressure P
"i" is corrected to "indicated mean effective pressure Pi or an amount equivalent to it." (12) From the 18th line to the 19th line of page 16, the statement ``The value corresponding to Pi should be adopted.'' has been changed to [
A value corresponding to Pi (referred to as pseudo P1) may be adopted. ”. (13) In the 6th line of page 17, the phrase "value equivalent to 1" is corrected to "value equivalent (pseudo Pi)". (14) Insert the following sentence between the 8th and 9th lines of page 17. "Pi in the flowchart means pseudo Pi." (15) On page 17, line 10, "J for indicated average effective pressure is corrected to "pseudo Pi." (16) In the 20th line of page 22, the phrase "throttle valve opening as a feedback signal" has been replaced with "means for controlling the output of the fPi function (e.g. throttle valve opening) as a feedback signal."
Correct to 1. (17) On page 24, line 1 of the same page, "indicated mean effective pressure"
The amount corresponding to the indicated mean effective pressure (pseudo Pi
). (18) In the drawings attached to the specification, wIJ 1, No. 11
Correct each figure as shown in the attached sheet. ``A target value calculation means for calculating a target value of the range pressure or a quantity correlated with this, a comparison means for comparing the target value with the detected value of the cylinder pressure, and a comparison means based on the result of this ratio. , of
1. An engine control device characterized by having a hand that can be used. ” Figure 1

Claims (1)

[Claims] In an engine control device that controls engine output by driving a throttle valve based on the accelerator opening, there is a means for detecting the cylinder pressure of the engine, and a means for detecting the cylinder pressure or an amount correlated thereto from the accelerator opening and the engine speed. A target value calculation means for calculating a target value, a comparison means for comparing the target value with the detected value of the cylinder pressure, and a throttle valve drive opening calculation means for calculating a throttle valve drive opening based on the comparison result. and a throttle valve drive means for driving the throttle valve in accordance with the throttle valve drive opening degree.