JPH02286854A - Engine idling judging device - Google Patents

Abstract

PURPOSE:To sense the idling condition precisely by updating the min. value in memory upon comparison with the throttle output value when the condition is mechnically idling and the output valve of a throttle sensor lies nearer the close side than the comparison reference value for idling judgement. CONSTITUTION:When a judging means 30 judges from a signal given by an idle switch 10, that the condition is mechanically idling, followed by judgement by an updating means 31 that the signal from a throttle sensor 9 lies nearer the close side than the comparison reference value for idling judgement, then a comparison is made with the min. value stored in a memory means 32, and if lies nearer the close side that it, the min. value in memory shall be updated with a throttle signal. When another judging means 33 judges from the idling switch being ON and from the idling data (idling off) in a memory means 39, that the incremental correction value updating conditions are met, then the incremental correction value shall be updated by an updating means 35 through a counter means 34, and a setting means 37 performs adding to the min. value in memory at the time of idling being off through a memory means 36 for setting of the comparison reference value, which together with the throttle signal allows a judging means 38 to judge the idling condition. Thus misjudgment is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an engine idle determination device that can accurately determine an idle state without misjudgment based on output No. 8 of a throttle sensor.

[Prior art and problems to be solved by the invention] Generally,
During idle operation, the idle speed control valve <l5CV) is controlled to adjust the bypass passage area, adjust the engine speed to the set idle speed, and fix the ignition timing to the preset ignition advance angle. .

Conventionally, this idle judgment was performed using an idle switch (
When the idle switch is turned on, it is determined that the throttle valve is fully engaged, that is, the engine is in an idle state, and the engine is controlled to idle.

By the way, since the idle switch mentioned above needs to be turned on reliably when the throttle is fully open, it is actually turned on at the opening before the throttle valve is fully opened (mechanically, the throttle is fully closed). is set to .

As a result, even if you press the accelerator pedal and open the throttle valve when starting, etc., the engine speed will rise, but the throttle valve will not reach the specified opening. If the accelerator pedal is released while the vehicle is decelerating and the idle switch is turned on even though the throttle valve is open, the vehicle will shift to idle control.

Conventionally, the idle switch did not turn off even though the throttle valve was slightly open (judging the throttle to be fully open), or the idle switch was turned ON before the throttle valve was fully closed, but the throttle was turned off during that time. Since the rate of variation in the area of the bore was small and the range of variation in intake air m was small, it did not have a large effect on the starting acceleration performance or deceleration running.

However, in recent engines where the throttle bore diameter has been increased in order to obtain high performance and high output, even the slightest change in throttle opening results in a large intake air indication (fluctuations). If the idle operation is not canceled even if the engine speed is increased, or if the idle switch is turned on before the throttle valve is fully opened during deceleration driving, the idle υ control will be performed based on the output signal of the idle switch. If the idle control is disabled or the idle control is being performed, sufficient output will not be obtained, which will not only deteriorate starting acceleration performance and deceleration performance, but also prevent proper air-fuel ratio control, resulting in worsening of exhaust emissions and fuel efficiency This poses many problems, and furthermore, it has a great effect on idle controllability.

To deal with this, it is possible to set the idle switch near the fully closed throttle, but there is a limit to the proximity distance to ensure the 0N10FF of this idle switch, and that setting is difficult. It is difficult and difficult to realize because it cannot be mass-produced.

On the other hand, for example, in Japanese Patent Publication No. 63-15467, in order to detect the state in which the throttle valves 1 to 1 are closed to the minimum realizable opening, when the output signal of the throttle sensor becomes smaller than the memorized value, the above-mentioned A technique has been disclosed in which a stored value is sequentially updated with the output value of a throttle sensor, and at this time, it is determined that the throttle is fully 1 (idle state B), and idle control is performed.

However, in this prior art, when the throttle sensor output value becomes smaller than the stored value, the stored value is simply updated with the throttle sensor output value, and the stored value is on the smaller side (
The stored value is used as a comparison reference value for idle judgment, and the throttle sensor output value is compared with this comparison reference value for idle judgment to judge whether the throttle is fully closed. Because
Due to the influence of throttle sensor output signal drift, etc., the throttle sensor output value when the throttle is fully open may be 1 bit (
(minimum resolution) When the lift is lifted up, the throttle sensor output value becomes higher than the comparison reference value for idle judgment even though the throttle is fully closed, and the software cannot detect the fully open throttle state, resulting in incorrect judgment. There is.

As a countermeasure against this, an idle switch and a throttle sensor are used together, and as shown in FIG.
If it is on the throttle opening side than the HV HIM,
As the minimum value of the throttle signal output value THV, the above stored minimum fifiTHVHIN is updated with this output value THV, and the offset value α is added to this stored minimum value THV MIN to determine fi'/L. Comparison reference value T
HVIS14 (=THVHIM→-α) is considered, and a so-called soft idle switch is considered, in which the idle determination comparison reference value THV ISW is compared with the throttle signal output value THV to determine the throttle fully open state using software. .

However, in order to improve the detection accuracy of the throttle fully closed state, or even idle state, with this type of so-called soft idle switch, it is necessary to reduce the above offset value α. Then, the throttle switch t? connecting the potentiometer of the throttle sensor mentioned above is connected. If the throttle sensor output changes when the throttle is fully open due to distortion of the foot, deflection due to negative pressure when the throttle is fully closed, or drift in the output value of the throttle sensor 4 due to temperature changes, for example, As shown in the elapsed time period t4 to t5 in Fig. 7, the throttle signal output value THV exceeds the idle determination comparison reference value THV even though the throttle is actually fully closed.
A problem arises in that a fully open throttle state, J, that is, an idle state, is not detected in terms of software when it is higher than Is-.

Therefore, in the previous application (Japanese Patent Application No. 1-12625) filed by the same applicant, the present applicant stated that as shown in Figure 8,
When the idle switch is ON and the soft idle is OFF (time 1Ilt 4' to t4a), the predetermined time T
For each IME, the memorized minimum value THV HIM is increased by a predetermined value toward the throttle opening side, and the idle judgment comparison reference value THV Is- is increased to follow the change in the throttle signal output value THV when the throttle is fully closed. proposed a method of detecting an idle state (elapsed time t4a-t5) by modifying the idle determination comparison standard WATHV Is-.

However, as mentioned above, an engine with a relatively large throttle bore diameter can produce a large amount of output with a small change in throttle opening, so when driving at a constant speed on flat ground, the accelerator pedal must be lightly pressed. Continuing to press the pedal often means keeping the throttle valve at a very small opening.

Then, as shown in the elapsed time t5 to t6 in Fig. 8, when the accelerator pedal is lightly depressed, the soft idle is temporarily turned off, but when the idle switch is turned on and the throttle valve is maintained at a small opening, the idle is turned off. The memory minimum value THVHIN is increased by a predetermined value at each predetermined time interval until the determination comparison Ml value THV ISW becomes larger than the throttle signal output value THV (elapsed time tea), and then the accelerator pedal is depressed to idle. After turning off the switch (time 111t6)
, until the soft idle is turned on again (elapsed time t
7) Maintain a predetermined lifted stored minimum value T HV HIM.

Therefore, when the accelerator pedal is released from the idle switch OFF state and the throttle valve is fully opened, the idle judgment comparison reference value THV 1514 set based on the memory minimum value THV old group will be lifted to a predetermined value. Therefore, in the process of opening the throttle valve (elapsed time t7 to ta), the idle OF
Despite F, it is incorrectly determined that the idle is ON1, that is, the throttle is fully closed.

As a result, the air-fuel ratio υ controllability and ignition timing nullability at the initial stage of coasting become worse, leading to problems such as deterioration of fuel efficiency and deterioration of drivability.

[Object of the Invention] The present invention was made in view of the above circumstances, and is capable of accurately detecting the idle state without misjudgment, and even if the idle state is mechanically detected by the idle switch during steady driving, the idle state is detected automatically. There is no transition to control mode, stable output performance can be obtained, and even in the early stages of coasting, there is no misjudgment that the engine is in an idling state.
The object of the present invention is to provide an engine idle determination device that improves air-fuel ratio, ignition timing controllability, fuel efficiency, and drivability.

[Means for Solving the Problems] An engine idle determination device according to the present invention uses the idle switch state determination means to determine the mechanical idle state from the output signal of the idle switch, such as the idle switch state determination means that determines the mechanical idle state from the output signal of the idle switch. If the idle state determination means determines that the idle state is the idle state, the throttle signal output value of the throttle sensor is compared with the minimum value stored in the minimum value storage means, and the throttle signal output value is compared with the minimum value stored in the minimum value storage means. When the output value is closer to the closed side than the stored minimum value, minimum value updating means updates the stored minimum value stored in the minimum value storage means with the throttle signal output value, and the idle switch state determining means determines the mechanical idle. If the throttle signal output value remains open for a predetermined period of time than the comparison reference value for idle determination set by the comparison reference value setting means, the increase correction value stored in the increase correction value storage means is updated with a value obtained by adding the set value to this increased correction value, and on the other hand, if the idle switch state determining means determines that mechanical idle has been released, the increased correction value stored in the increased correction value storage means is initialized. an increase correction value updating means for updating the increase correction value, and adding the increase correction value stored in the increase correction value storage means and the set offset value to the stored minimum value stored in the minimum value storage means, and setting a comparison reference value for idle judgment. and an idle state determining means for determining an idle state by comparing the comparison reference value for idle determination set by the comparison reference value setting means and the output value of the idle signal. It is equipped with the following.

[Function] In the above configuration, the mechanical idle state is determined from the output signal of the idle switch, and the throttle signal output value of the throttle sensor indicating the throttle opening is determined to be on the closing side compared to the comparison reference value for idle determination. In this case, this throttle signal output value is compared with the minimum value stored in the minimum value storage means, and if the throttle signal output value is closer to the closing side than the minimum value stored in the minimum value storage means, the throttle signal output value is compared with the minimum value stored in the minimum value storage means. The minimum value is updated with the throttle signal output value.

In addition, if the mechanical idle state continues for a predetermined period of time in which the throttle signal output value is on the open side compared to the idle determination comparison reference value, the increase correction value stored in the increase correction value storage means is changed to The correction value is updated with a value obtained by adding the setting value, and when it is determined from the output signal of the negative idle switch that mechanical idle has been released, the increase correction value stored in the increase correction value storage means is initialized.

Then, in the stored minimum value stored in the minimum value storage means,
A comparison reference value for idle judgment is set by adding the increase correction value stored in the increase correction value storage means and the set offset value, and this comparison reference value for idle judgment is compared with the above-mentioned throttle signal output value. Determine idle state.

[Embodiment 1 of the invention Hereinafter, the present invention will be explained in detail based on the drawings.

1 to 6 show an embodiment of the present invention, FIG. 1 is a functional block diagram of the idle determination means, FIG. 2 is a schematic diagram of the engine control system 1, and FIG. 3 is a schematic diagram of the engine control system 1. ,and,
A flowchart showing the procedure for updating the increase correction value, FIG. 4 is a flowchart showing the procedure for determining the idle state, and FIG. 5 shows the idle switch output in response to the throttle signal output value.
Idle discrimination signal and soft idle time chart. FIG. 6 is a time chart when the engine is started by depressing the accelerator pedal.

(Structure) Reference numeral 1 in the figure is an engine body, and a cylinder head 1a of this engine body 1 is formed with an intake boat 1G and an exhaust boat 1d that open into a combustion chamber 1b.
An intake pipe 2 is communicated with C, and an exhaust pipe 3 is communicated with the exhaust boat 1d. Furthermore, an air cleaner 4 is installed upstream of the intake pipe 2, and this intake pipe 2
A throttle valve 5 is interposed in the middle, and an air chamber 2a is formed immediately downstream of the throttle valve 5.

Further, an air bypass passage 6 is communicated with the intake pipe 2 across the throttle valve 5, and an idle speed control valve (J3) is connected to the air bypass passage 6.
ISCV) 7 is installed.

Further, an intake air amount sensor (in the figure, a hot wire type air flow meter) 8 is interposed in the intake pipe 2 immediately downstream of the air cleaner 4.

Further, a throttle sensor 9 and an idle switch 10 are installed on the throttle shaft 5a of the throttle valve 5.
are installed in succession. The idle switch 10 is connected to the throttle valve 5 in order to ensure its operation.
It is set so that 0N10FF occurs at the opening point θ0, which is slightly open from fully closed.

Further, an injector 11 is attached to the intake pipe 2 immediately upstream of the intake boat 1C.

Moreover, on the crankshaft 1e of the engine main body 1,
On its outer periphery, there are protrusions at each predetermined crank angle, or
A crank rotor 12 having a slit is mounted on the shaft, and six pairs of crank angle sensors 13 are provided on the outer periphery of the crank rotor 12, each consisting of an electromagnetic pickup or the like for detecting a crank angle. Furthermore, a cooling water temperature sensor 14 faces the cooling water passage 1f of the engine body °1.

Further, an 02 sensor 15 faces the exhaust pipe 3, and a catalytic converter 16 is installed downstream thereof.

(Circuit configuration of control unit) On the other hand, reference numeral 17 is a control unit consisting of a micro-combination controller, etc., and this control unit 1
7 CPtJ (central processing unit) 18, ROM1
9, RAM 20, input interface 21, and
Output interfaces 22 are connected to each other via path lines 23.

Further, the idle switch 10 and the crank angle sensor 13 are connected to the input interface 21, as well as the intake air amount sensor 8 and the throttle sensor 9.
, a cooling water temperature sensor 14, 02 and a sensor 15 are connected via an A/D converter 24.

Further, the injector 11 and the coil 7a of the 15CV7 are connected to the output interface 22 via a drive circuit 25, and a spark plug 26 is connected via a distributor 27 and an igniter 28.

The ROM 19 stores fixed data and control programs, and the RAM 20 stores data obtained by processing signals input to the input interface 21 and data processed by the CPU 18. Ru. Furthermore, in the above CPLJ 18, the above RO
According to the control program stored in M19, the above R
Air-fuel ratio tI based on various data stored in AM20
III. Ignition timing control and idle speed 1. Do II m.

(Functional Configuration of Idle Judgment Means) As shown in FIG. It is composed of a correction value update condition determining means 33, a counter means 34, an increasing correction value updating means 35, an increasing correction value storing means 36, a comparison reference value setting means 37, an idle state determining means 38, and an idle data storing means 39. There is.

The idle switch state determining means 30 determines whether the vehicle is in a mechanical idle state based on the output signal of the idle switch 10. That is, when the idle switch 10 is ON, it is determined that the vehicle is in a mechanical idle state, and when the idle switch 10 is OFF, it is determined that the vehicle is in an idle release state.

When it is determined that the engine is in a mechanical idle state (the idle switch 10 is in the ON state 1), a trigger signal is output to the minimum value updating means 31.

Note that the idle switch 10 is 0FFL when the throttle Ii1 θ is a predetermined opening 00 or more, and is 0FFL when the throttle Ii1
It turns ON when it is less than 0, and when assembling, considering the reliability of 0N10FF operation and detection error, it is set so that U1:ON10FF is turned on when the throttle valve 5 is slightly open.

In the minimum value updating means 31, when the trigger signal is output from the idle switch state determining means 30, the throttle signal output ta of the throttle sensor 9<output voltage) TH
V and idle data AIDATA stored in the idle data storage means 39, which will be described later, are read, and only in the case of idle data At (idle ON), the above output value THV and a predetermined address area of the RAM 20 are read. Compare the stored minimum value 1iITHVHIN stored in the minimum value storage means 32, and if the throttle signal output value THV is less than the stored minimum value T HV 81M,
This stored minimum value T HV HIM is updated with the throttle signal output value lower HV.

The increase correction value update condition determining means 33 reads the determination result of the idle switch state determining means 30, and also reads the idle data storage means 39, which is configured in an address area different from the minimum value storage means 32 of the RAM 20.
Idle data AID, which will be described later, is stored in
Load ATA.

Then, when the idle switch 10 is ON and the idle data A I DATA is A I DATA=1 (idle 0FF), it is determined that the increase correction value update condition is satisfied, and a trigger signal is output to the counter means 34.

The counter means 34 starts counting when the trigger signal is output from the increase correction value update condition determination means 33, and the increase correction value update condition is set for a predetermined time TIME (for example, T
IME=ISeC) If continued, increase correction value updating means 3
5 Outputs a trigger signal.

In the incremental correction value updating means 35, when the trigger signal is input from the counter means 34, the idle switch 10 is turned on and the idle data A I DATA meets the increasing correction value updating condition of △10^TA=1. Predetermined time TI
When the ME is continued, the setting 1f [THVs (for example, l bit: 5av) is added to the increased correction value THVD stored in the increased correction value storage means 36 configured in a predetermined address area of the RAM 20, This increase correction value THVD is updated (THVD 4-THVD
-t THVS).

Further, when the idle switch state determining means 30 determines that the idle switch is in the mechanical idle release state of OFF, the increased correction value THVD stored in the increased correction value storage means 36 is cleared (THVD←φ).

In the comparison reference value setting means 37, the minimum value storage means 32
The idle data AIDATA stored in the idle data storage means 39 and the increase correction value THVD stored in the increase correction value storage means 36 are read out from the storage minimum value THVHI stored in the A I
In the case of idle OFF of DATA-1, the first offset value A (for example, 2 to 3
bit: 10 to 15sv) and the increase correction value THVD, and this is used as the idle judgment comparison reference value THV l5
Set as I4 (THVISW ←THVHI14
+A+THVD).

On the other hand, the idle data A I DATA is
If DATA-〇 is idle ON, the minimum memory value ■
The first offset value A and the second offset value B (for example, 1 to 2 bits: 5 to 1Qmv) are added to HVHIN.
and the increase correction value THVD, and set this as the comparison reference value THVISW for idle judgment? ;s (
THVISIJ 4-THVHIN +A1B+THV
O).

The idle state determination means 38 uses the comparison standard value THV for idle determination set by the comparison reference value setting means 37.
Is- is read, and this comparison reference value for idle judgment T H
V Is- and the output value THV of the throttle sensor 9
If T HV ≦T HV ISW, the current operating state is assumed to be idle, and the idle data Al^TA is stored in the idle data storage means 39.
When stored as =0, an idle switch is output to 'b'.

Further, when THV>THVIS14O, the current operating state is determined to be an idle release state, and the idle data A I DATA is stored in the idle data storage means 39.
■Stores as ^-1 and outputs idle switch.

(Operation) Next, the operation of the two idle determination means having the above configuration will be explained according to the flowcharts of FIGS. 3 and 4.

: When starting: First, turn the ignition to O as shown in Figure 3 <8).
N Then, the power of the control unit 17 is turned on.
,, In the main routine, only for the first time immediately after turning on the power, the minimum memory value THVH11+ is stored in a predetermined address area of the RAM 20 in step 5101, and
The comparison reference value T l-I V IsW for idle judgment is
Initial value THV I old Nitainishi T7 Rai XL, (THVHIN = T1 (VIS14
=T)-IVINI), and in step 5102, set the increase correction value lower HVD to φ (,THVD-φ)
.

In addition, l in the above first $1 [i T )-I V 1 is,
It is determined from experiments, etc., and for example, when assembled, the throttle signal output value THV of the throttle sensor 9 and the idle switch 10 are changed from ON to OFF when the throttle is fully 11 o'clock.
This is the average value of the throttle signal output value THV of the throttle sensor 9 when switching to FF.

That is, immediately after the control unit 17 is powered on, the throttle valve 5 may not be fully closed, and the throttle signal output value THV of the throttle sensor 9 when the throttle is fully open is unclear, and this throttle signal output value THV is It also changes depending on the deterioration of the throttle sensor 9 over time. For this reason, immediately after the control unit 17 is powered on, the memory minimum value THVHIN and this memory minimum value TI-IV old N are set as a predetermined offsetting comparison reference value THVrsW for idle determination (initial value T). -+V By initializing at 181, the initial setting value is made clear.

Next, the memory minimum value THVHIN, which serves as a reference when setting the idle determination comparison reference value THV Is- used in idle determination, and the increase correction 11TH
The VO update is executed according to the program shown in FIG. 3(b).

First, in step 5201, it is determined whether the idle switch 10 is ON, and if the ON state, that is, the idle state is mechanically detected, step 5202
If the OFF state, that is, the idle release state is mechanically detected, the process proceeds to step 5203, and after setting the increase correction value T HV D stored at a predetermined address in the RAM 20 to φ ( THVD←
φ), Step 5210 is entered.

For example, if the engine is started with the accelerator pedal released, the idle switch 10 is in the ON state, so the process proceeds to step 5202.

On the other hand, when the accelerator pedal is depressed to start the engine, the idle switch 10 is in the OFF state, so the process proceeds to step 5210 via step 5203, and the memory minimum value T
HVHIH is not updated.

When it is determined that the idle switch 10 is ON in step 5201 and the process proceeds to step 5202, the idle data A I DATA stored in an address area different from the address area in which the minimum storage value THVHIN of the RAM 20 is stored is stored. At the same time, the throttle signal output value THV of the throttle sensor 9 is read and the process advances to step 5204.

The idle data A I DATA is data representing the idle state determination result in the idle state determining means 38, and is set in step 5307 or 5309 in the idle state determination procedure described later.
In the case of I OAT8=, the idle determination result on the 3rd day of the idle state determination means is idle state 17! (idle ON), and AIO^TA=1
In this case, it is assumed that the idle state is released (idle 0FF).

In step 5204, the idle data AIDATA read in step 3202 is set to A I DATA=
It is determined whether A I DArA=O, in the idle state, the process advances to step 5205;
If the idle release state is 10Al'A=1, the process advances to step 5207.

Note that in the case of the first time, since the idle data AID is not set to ■, step 5204 is skipped and the process proceeds to step 5205. In addition, as mentioned above, when the engine is started with the accelerator pedal released, and if the routine is repeated for the second time or later, the idle data
Since TA is set to AI DATA-0 (idle ON), steps 5204 to 5205
Proceed to.

In step 5205, the minimum value THVHIN of the note t11 stored in the RAM 20 and the throttle signal output value T of the throttle sensor 9 read in the above step 5202 are used.
If THV≧THVHIN (7), proceed to step 5210 and find that TI-IV<THVHIN
In this case, the process advances to step 8206.

When the accelerator pedal is released and the engine is started, the STRULE sensor 9 read in step 5202 above is activated.
Since the throttle valve is fully open, the throttle signal output value T I-I V is the minimum value, and the
Memory minimum 1iiTHVHIN initialized at 01
(=THVIN!) It's low, but THV<
Since it is THV old N, the process advances to step 8206 and the RA
Throttle signal output value T that read the minimum memory value THVHIN stored in M20 in step 5202 above.
HVt' updated, (THVHIN 4-THV), counter count I + tj T-C in Stub 5210
Clear 0UNT (TC01NT←φ) and end the program (elapsed time tl in FIG. 5).

At this time, in the idle state determination procedure, as shown in FIG. 4, the throttle signal output value THV is first read in step 5301, and the stored minimum value TI-IVHIN stored in the RAM 20 is read in step 5302.

Increase correction value THVD and idle data AI
DATA is read and the process advances to step 5303.

In step 5303, the above idle data AIDA
Determine whether T8 is ΔIQ^TA=l. When the routine is executed for the first time, the above idle data AIDA
Since the TA settings have not been made yet, step 530
2, step 8306 and vacate.

In step 8306, the script read in step 5301
1 liter signal output value THV and idle judgment comparison Ju
1 value THVIS14. Note that the initial idle determination comparison standard ItiT HV ISW is set at step 8101F initial value setting grtr (THVISW =
TI-IVINI).

When the engine is started without depressing the accelerator pedal, the throttle signal output filTHV is set to the initial value, the idle judgment comparison reference value THVIS@ (=TH
VINI ) [F (THV<THVISW), it is determined to be in the idle state (soft idle ON),
The process proceeds from step 5306 to step 5307, where the idle data AIDATA is set to AIDATA=O and stored at a predetermined address in the RAM 20.The process then proceeds to step 3308, where an idle ON signal is output (fifth
The elapsed time tO to t1 in the figure.

On the other hand, when the engine is started by depressing the accelerator pedal, the throttle signal output (aTHV is larger than the initial idle determination comparison reference value THVIsW (THV>THVIsW), so the fiddle is released (soft idle 0FF). ) and step 8306
Proceeding to step 5309, the idle data AID^
After setting TA to ^-1 and storing it at a predetermined address in the RAM 20, the process proceeds to step 5310 and outputs an idle OFF signal (elapsed time tO to t in FIG. 6).
100).

: During idling operation: Minimum value stored when the engine starts with the accelerator pedal released, the engine fully explodes, and shifts to idling operation (with the accelerator pedal released and the throttle fully open) T I-I
The V HIM update procedure includes steps 5201 and 520.
2. The program described above is executed up to 3204, and at this point, step 5201 (-Idle data A to be read is
I DATA is A I DATA-0 (Idle ON
), the process proceeds from step 5204 to step 5205, where the throttle signal output value T HV read in step 5202 is compared with the minimum memory value T HV HIM stored in the RAM 20, and TH
If V≧THVHIN (7), 1 is the minimum memory value 1-1-I
Proceed to step 3210 without updating V HIM, and if THV<T)+VHIN, proceed to step 52
Step 06 advances to step 5210, where the minimum memory value THVHIN stored in the RAM 20 is updated with the throttle output [1 THV read in step 5202 above, and the flow advances to step 5210, where the counter value T C0UNT is cleared and the program ends. (elapsed time t1-t2 in FIG. 5).

The idle state determination procedure at this time proceeds to step 3303 via steps 3301 and 5302 as described above, and the idle data AIDAT was set to 0^18-0 (idle ON) in the previous routine. Therefore, the process advances from step 5303 to step 5305.

In step 5305, the idle determination comparison reference value T
HV 1314 is the stored minimum value THV old N1 read in step 5302 above and the incremental correction value TI-IV.
Calculated from the following formula based on D.

THVISW=TI-IVHIN+THVD
＋A THVO=φ set in .

Then, the process proceeds to step 5306, where the idle determination comparison reference value T HV [311 calculated using the above equation (1)] is compared with the throttle confidence output value T l -I V read in step 5301r.

At this time, the signal output value - "] IV is the minimum value of the fully closed throttle, and the first and second off-hit values are set to the minimum memory value T I-I V MIN stored in the RAM 20. A, B, and incremental correction 4XBTl-I
Idle determination comparison standard 1i set by adding V[l
f'i T11VIs- or less (TI-IV≦THVIS
I4), it is determined that the state is idle, and step 3
Proceeding from step 306 to step 5307, idle data A
After setting I DATA to AID8
Step 830
8 and outputs the idle switch (elapsed time t1 to t2 in FIG. 5).

Note that the first offset l1iA and the second offset value B in equation (1) of -F are determined in advance through experiments and the like and are stored in the ROM 19.

If the above memorized minimum value T + - I V MIN is used as it is as the comparison reference value T HV Is- for idle judgment without adding the above off-hit values A and B, the throttle signal output value THV will drift, etc. :L minimum ff1T HVHIN J: V) 1 bit (
(Minimum Min. MiH1l) If the temperature becomes too high, it will be incorrectly determined that the idle is OFF even though the throttle valve is fully open, but the above (1) Equation (7) MiEIA + 8
is added to the stored minimum value (il'nT-HVHIN to offset the stored minimum value T HV HIM and compared for idle judgment!). The output value T HV is the minimum memory value T HV )11
Even if the value is 1 bit (minimum resolution) larger than 8, the idle state determination is made so as not to incorrectly determine that the idle state is OFF.

Also, according to experiments, the first offset value A is 2
~3 bits (10 to 15 av), and the second offset WiB is preferably 1 to 2 bits (5 to 10 sv).

Also, press the accelerator pedal and press the idle switch 10.
If you start the engine with OFF, then release the accelerator pedal and shift to idling,
The opening degree of the throttle valve 5 decreases, the throttle signal output value Tj-I V shifts to the first position, and the idle switch 10 shifts from OFF to ON.

The minimum memory value update procedure at this time is the elapsed time 1 in Fig. 6.
Between t100 and t101, the idle switch 10 is still OFF.
Since it is in the FF state, the program proceeds from step 5201 to step 5203 as described above, and the increase correction value T is
After setting HVD to T HV D-φ, step 52
The program ends after 10 steps.

Therefore, the stored minimum value THVHIN is stored in step 51
Maintain the state initialized at 01 (T l-I V
Formerly N=THVINI).

When the idle switch 10 is turned ON, the process advances from step 5201 to step 5202, where the throttle signal output value THV is read and the idle data AI
D^TA is read from the RAM 20 and the process advances to step 5204. At this time, since the idle data Al[) was set to -1 (idle 0FF) in the previous idle state determination procedure, the idle data Al[) was set to -1 (idle 0FF).
Proceed to.

Then, in this step 5207, the counter counts 1.
i1'jTcOUNT yFrI>'y IJ Mentru(TCOUNT ←-Bousr + i>.

Next, in step 5208, the count value T COUNT incremented in step 5207 is compared with the set time TIME (for example, 1 SeC), and TCOU
If NT<TIME, the program is terminated and TC
If OUNT ≧T IME (7), the process advances to step 5209, and the increase correction Wf stored in RAM 20 is
-r Set value THVS (for example, 1 bit
: 5 mv) to obtain this increase correction value THVD.
1 to IVD←T l-I VD+THVS)
, in step 3210 the counter counts (direct T C0
Clear UNT and end the program (elapsed time t101-t102 in FIG. 6).

Then, at the elapsed time t102.1 in FIG. 6, that is, when the throttle signal output value THV becomes equal to or less than the idle judgment comparison reference value -HVIs-, the idle data A
Since I DATA is set to A I DATA = 0 (idle ON) (steps 8306 to 33
08), steps 5201 to 5202.3
The process proceeds to step 5205 via step 204.

During the elapsed time t102 to t103, the throttle signal output value THV is still stored in the RAM 20.
IN), so steps 3205 to 52
The program ends after 10 steps. Therefore, the storage minimum value T'HVHIN is not updated.

Then, after the elapsed time t103 in FIG. 6, when the throttle signal output value THV becomes less than the memory minimum value 1-HVMIN (THV<THVHIN), the process proceeds to step 5201.
Step 320 via ゜5202.5204.5205
6, the minimum memory value THVHIN stored in the RAM 20 is updated with the throttle signal output value THV read in step 5202, and the program ends via step 5210.

On the other hand, in the idle state determination procedure, in the previous routine, the fiddle data AID^■ was changed to A I DATA-1.
Steps 3301 and 3302 are set to
The process proceeds from step 5303 to step 5304 through
The stored minimum value T HV read in step 5302 above
MIN and increase correction value THVD 1. :Based on
The idle determination comparison reference value T ) I V ISW is calculated from the following equation.

TI] VISW =THVHIN +THVD +A
・(2) A: First offset value Then, in step 5306, the idle judgment comparison reference value THVIS, which was sieved by the above equation (2), and the throttle signal output value TH, which was read in the above step 5301, are calculated. compare.

Throttle signal output is 1 until elapsed time t102 in FIG.
a T HV is the comparison reference value THVISW for idle judgment
(T HV > T HV ISW ), it is determined that the idle state is released, and the process proceeds from step 3306 to step 3309, where the idle data AI DA
TA is set to △IO^TA=1 and stored in the RAM 20, and the process proceeds to step 5310, where an idle OFF signal is output.

Then, at the time of elapsed time 102 in FIG. 6, T HV≦
'Tt-+vIS-, it is determined to be in an idle state, and the process proceeds from step 3306 to step 5307, where the idle data AIDATA is updated to AI DATA=O, and the process proceeds to step 3308, where an idle ON signal is output.

Furthermore, from the next time onwards (elapsed time of 1:102 hours in Figure 6)
2), the idle data △IQ^TA was set to A I DATA = 0 in the previous routine, so steps 8303 to 53
05, the idle determination comparison reference value THVIS- is set using the formula (1), and then the process proceeds to step 8308 via steps 3306 and 5307, where an idle ON signal is output.

By the way, the throttle signal output value THV decreases with the opening operation of the throttle valve 5, and the comparison standard for idle judgment is 1 m! For THVIS-, 1-1-I V >T
Immediately after transitioning from HVIS- to THV≦THV Is-, the idle judgment reference value T I-I V l5I4
is set, the A noset lift with respect to the stored minimum value THVHIN is increased by the second offset value of 8 minutes, and as a result, the throttle signal output value THV changes from THV>THVISW to Tl-IV≦THVIS1.
Idle OFF/ON determination hunting immediately after transition to 4 is prevented.

: At start acceleration: Since the elapsed opening t2 after the start acceleration, that is, at time charts 11-11 in FIGS. 5 and 6, changes in the same way regardless of the starting state of the engine, the time chart in FIG. 11- Explain by talking to the teacher.

When the accelerator pedal is depressed to start and accelerate the vehicle from an idle state, the throttle signal output (iaTHV) gradually increases as the throttle valve 5 opens.

In the storage minimum value update procedure, the elapsed time t2 in FIG.
~ t3, the throttle signal output value THV is less than or equal to the idle determination comparison reference value Tl-IVIsW (THV≦T
HVISW ) - ("uV), to the idle data AIDAT stored in RAM20 is Al0AT^ = 0
(idle ON), so step 52
01, steps 5202 and 3204 are executed, and the process proceeds to step 5205.

At this time, the throttle signal output ITHV is gradually rising, so it is stored in the RAM 20 and stored in the RAM 20.
Since THVHIN or more (THV≧THVMIN), the process goes from step 5205 to step 5210 and ends the program. Therefore, updating of the stored minimum value is stopped.

Therefore, during the elapsed time period [3 to r5 in FIG.
1■■5lll), idle data △l DATA is A
Since IDATA-1 (idle OFF>) is set, the process advances from step 5204 to step 5207, and the count value T C0IJNT of the counter is incremented.
-L, in step 8208, the count value T C0IJNT incremented in step 5207 and the set time TIME are compared, and TCOUNT < T I M
If E, end the program L, mata, TCOUNT
≧TIME17), the process advances to step 5209.

Then, in step 5209, the increase correction value THVD is updated with the value obtained by adding the set value THVs to the increase correction value THVD stored in the RAM 20 (THVO
4-THVD +THVS) After that (1), the count value TCOUNT is cleared in step 5210 and the program ends (elapsed time t3 to t5 in FIG. 5).

In addition, when accelerating to start, the throttle valve 5 increases by 1 degree, reaches the set opening θ0, and the idle switch 10 increases.
is OFF, steps 5201 to 520
Step 3 goes to step 5210 to clear the incremental correction value TI-IVD (THVD←φ), and then, at step -C1 5210, the counter count IT COUNT is cleared and the program ends.

On the other hand, in the idle state determination procedure at the time of starting acceleration, during the elapsed time t2 to t3 in FIG.
Steps 5301 and 530
2, the process proceeds from step 5303 to step 5305, and the memory minimum +fi T read out in step 5302 above is
Based on the HVl axis and the increase correction (aT) IVD, the idle determination comparison reference value T HV ISW is set using the formula (1) (% formula %), and the process proceeds to step 3306.

During the elapsed time period t2 to t3 in FIG.
≦THVISI4), it is determined to be in an idle state, and the process proceeds from step 3306 to step 5307, where the idle data A I DATA is set to A I DAT^-0 and stored at a predetermined address in the RAM 20, and step 8
At 308, an idle switch is output.

Then, at the elapsed time t3 in FIG. 5, T HV>T
The HVIS 14 is determined to be in the idle release state, and the process proceeds from step 3306 to step 5309, where the idle data A I DATA is updated to AIDATA-1.
Proceeding to step 5310, the idle OFF signal is output.

During the elapsed time period t3 to t5 in FIG. 5, the idle switch 10 is ON and the idle data A I DAT
Since A is A I DATA = 1 (idle 0FF), in step 5209, increase correction Ir1T HV
D is increased and updated by the set value THVs every set time TIME. Therefore, the idle determination comparison reference value THVIS- set in step 5304 is increased every set time TIME by the increase correction value THVD updated in step 5209.

Then, the elapsed time t5, that is, the idle switch 1
When 0 becomes OFF, step 3203 rThe above increase correction value THVD is cleared, so the above step 53
Comparison reference value for idle judgment set in 04 T I-I
V Is- becomes the value obtained by adding the first offset value to the storage minimum value THVHIH until the idle data ΔI DATA becomes A I DATA-φ (idle ON) again (elapsed time t6).

It should be noted that the throttle signal output value T I - I V increases as the throttle valve opening increases, and compared to the comparison standard IFiTHVIsW for idle determination, T HV ≦
Immediately after the transition from THV TS to THV>THVIS, the idle judgment comparison reference value THV 1s14 is set, and the offset amount with respect to the memory minimum value T)-IVHIN is decreased by the second offset value 8. However, as a result, the throttle signal output value T H
V is THV≦T HV Is- to T HV > T
I-1 ■ Idle ON/OFF immediately after transition to ISH
Judgment hunting is prevented.

2. Deceleration Port 4.D. On the other hand, during deceleration operation, when the accelerator pedal is released, the thrower 1 to 1 signal output value THV moves toward the minimum value, and the idle switch 10 is turned ON from 01=[゛ at the set opening θ0.

In the procedure for updating the minimum memory value THV HIM at this time, C proceeds from step 5201 to step 5202 since the idle switch 10 has been turned ON, reads the throttle signal output value THV, and stores the idle data AIDATA in a predetermined location in the RAM 20. Read from the address and proceed to step 5204.

At this time, in the previous idle state determination procedure, the idle data AIDATA is set to AIDATA=1 (idle 0
FF), the process advances from step 5204 to step 5207, and the count value of the counter T C0
Increment UNT.

Next, in step 5208, the count ViT COUNT counted in step 5207 is compared with the set time TIME, and if T COUNT < T I M E, the program is terminated, and if T COUNT ≧ TIME, the program proceeds to step 5209. Set I to the increase correction value THVD stored in a predetermined address of the RAM 20.
TI-IVD 4-THVD + THVS), and update the increase correction value THVD by adding T)-1vS.
Stellaf 3210r counter count (Direct T C0U
1 gram is completed without clearing the NT (elapsed time t6 to t9 in FIG. 5).

On the other hand, the idle state determination procedure at this time is that the idle data AID^■^ was △10^■ in the previous routine.
Since it is set to ^-1 (idle 0FF), the process advances from step 5303 to step 5304, and the above (2)
) Formula % Formula % Comparison for idle judgment &ti%+, + direct T HV
The ISW is set and the process advances to step 8306.

During the elapsed time period t6 to t9 in FIG. 5, the idle determination comparison reference value T set in step 3304 above
Since the throttle signal output value 1 - HV is larger than V +31 (TI-IV>THVISW), it is determined that the idle state is released, and the process proceeds from step 3306 to step 5309, where the idle data AI stored in the RAM 20 is DATA is set to AID8[8-1, and an idle OFF signal is output at step 3310.

At this time, as shown in the elapsed time period t8 to t10 in FIG. 5, the distortion of the throttle shaft 5a connecting the potentiometer of the throttle sensor 9, the deflection of the throttle shaft due to negative pressure when the throttle is fully opened, or
Due to the influence of the drift of the throttle signal output value THV of the throttle sensor 9 due to temperature changes, etc., the output value THV of the throttle sensor 9 becomes s1 when the throttle is fully opened.
The throttle valve lifts in the direction between the throttle valves, and even though the throttle is actually fully open, the throttle signal output (llIT
HV is idle determination comparison reference value T I-I V l5
State °e higher than II4, comparison reference value T for idle judgment
If l-1vts- is kept constant, a fully open throttle state cannot be detected.

Therefore, in the present invention, the idle switch 10 is turned off.
If the throttle signal output value TH■ is higher than the idle judgment comparison reference value lower HV ISW (software idle release state; idle 0FF) when the mechanical idle state is detected by shifting to ON from Step 5 above
Step 3209 via 204.5207.5208
Since the increase correction value THVD stored in the RAM 20 is updated by adding the set value THV s at each predetermined time interval, the memorized minimum value THV
The idle judgment comparison reference value T +-1v rsII4 is set by adding the -A-th pit value A to the sum of HIM and the increase correction value THVD. 5, and at the elapsed time t9 in FIG. 5, the idle judgment comparison standard ITHVIS becomes equal to or greater than the throttle signal output value THV, and the throttle signal when the throttle 1 is fully closed is Even if the output value THV lifts, after going through steps 3306 to 8308 of the idle state determination procedure,
The idle state of all throttle valves can be detected by software.

Note that the above-mentioned predetermined opening time and set value T HV s were determined in advance through experiments, and are stored in the ROM 19.
Considering the influence of idle judgment when the throttle signal output value T HV is normal, according to experiments, T IME =
1 sec, TI-IVs = 1 bit (5m
v) is desirable.

Furthermore, in this embodiment, the idle determination comparison reference value THV
When setting IS-, the throttle signal output 1a THV is the idle judgment comparison standard (aTHVIs-, TI-IV＞
In the case of THVIsH, only the first offset #1A is used, and in the case of THV≦T HV IS-, the second offset value B is roughly added so that -r HV > THVIS
-, T HV > T f-I
Hysteresis is formed during the mutual switching of the relationship between VISW and THV≦THV[S-, which causes THV>
Tl-IVISJ t)1V≦THVISW t+
7) Software idle ON when switching between Ill and Ill,
OFF determination hunting is prevented.

As a result of the above, the idle determination can be made more accurately than when the output signal of the idle switch 10 is used as is, and the idle switch can be accurately obtained by almost following the full throttle.

: During steady driving: After accelerating from an idle state, when the driver eases down on the accelerator pedal and shifts to steady driving with the idle switch 10 turned ON and the throttle valve slightly opened, the driver generally releases the accelerator pedal once and then , press the accelerator pedal again.

At this time, increase correction fl? ! The THVD update procedure is as follows
Elapsed time t8 to t10 in the diagram (accelerator pedal released state)
, since the idle is ON, the idle data A
I DATA is set to A I DATA=Q.

Then, when the accelerator pedal is lightly depressed and the throttle valve is held at a slight opening with the idle switch ON in order to shift to steady driving, first, as shown in Fig. 5, fjlj11r
THV>THVIS14 and f;'), the idle data A is determined in step 5309 in the idle state determination procedure.
[DATA is set to AID＾■＾=1 (idle release status @: idle OFF).

Then, in the incremental supplement iE value update procedure, the idle data AI DATA is updated in the previous routine.
Since it is set to ATA-1, step 5201.32
The process proceeds from step 5204 to step 5207 via step 02, increments the counter count 1irf T C01lNT, and repeats step 5 at every set time TIME.
209, the increase correction value THVD is set to the set value T HV s
Increment history Fr1j.

In step 5306, THV≦T+−IVISW
If it is determined that the idle data Δ1DATA is set to A I DATA-φ in step 3307, the process proceeds from step 5204 to step 5205.
The updating of the increase correction value THVD is stopped (elapsed time t13-t14).

Next, when the accelerator pedal is depressed from a steady running state and the throttle opening becomes 00 or more, and it is determined in step 5201 that the idle switch is OFF, the increase correction value THVD is cleared in step 3203 (THVD←φ), and then in step 5304. The idle determination comparison reference value THV ISW to be set is the minimum value TI-IVH.
It becomes the value obtained by adding the first offset 1iiA to IN (elapsed time t16 to t17).

Then, the accelerator pedal is released again to shift to deceleration driving, and when it is determined in step 3201 that the idle switch is ON (elapsed time t17), the increase correction value T HV D is set in the routine below in step 5207. Time opening TI
The increase is updated for each ME, but in the previous routine, the increase correction value THVD was cleared as described above (TI-IVD←φ), so the idle judgment comparison set in step 5304 Group * 1lti T l-
The value of 1vISI (is low), which prevents an early determination that the idle is ON during the throttle valve closing operation.

As a result, the air-fuel ratio υj control at the beginning of coasting,
Good ignition timing controllability and good drivability can be obtained.

Further, as shown in the elapsed time t19, if the throttle signal output value T HV becomes equal to or less than the stored minimum value T HV 81M, the process proceeds from step 5205 to step 8206, and the stored minimum value T HV MIN is set as the throttle signal output i.
Update with Q T H, V (THVHIN 4-TI-
IV).

On the other hand, in the above 21st [1-le J, chive 1-17, -
[According to the output signal of the idle determination means 29, air-fuel ratio control, ignition timing control, and rotation speed control during idle are performed according to the idle state and idle release state.

Note that after power is applied to the control unit 17, if the idle switch 10 has never been turned on, if the output value of the throttle sensor 9 is inaccurate, or if self-diagnosis is in progress, the output signal of the idle switch 10 The idle state and idle release state are determined accordingly.

In addition, in this embodiment, a case has been described in which a type of throttle valve whose output value decreases as the throttle valve opening decreases is used, but the output value is not limited to this. A type of throttle sensor in which the value increases may be used. In this case, the direction of the inequality sign in each step 5205, 5306 in the flowchart is reversed, and the stored maximum value is used instead of the stored minimum value.

Furthermore, in this embodiment, an idle switch is used that is turned on when the throttle valve is open than the set opening θ0, and is turned ON when the throttle valve is closed than the set opening θ0. An idle switch that is turned on when the valve is open and turned off when the throttle valve is closed than θ0 may be used; in this case, the determination in step 5201 is reversed.

[Effects of the Invention] As explained above, according to the present invention, it is possible to accurately detect the idle state without misjudgment, and even if the idle state is mechanically detected by the idle switch during normal driving, the idle state is not changed to idle control. Not only can stable output performance be obtained without shifting, but also there is no misjudgment as idling even in the early stages of coasting driving, improving air-fuel ratio controllability, ignition timing controllability, fuel efficiency, and , excellent effects such as improved drivability can be achieved.

[Brief explanation of the drawing]

1 to 6 show one embodiment of the present invention, FIG. 1 is a functional block diagram of the idle determination means, FIG. 2 is a schematic diagram of the engine control system, and FIG. 3 is a storage minimum value, and FIG. 4 is a flowchart showing the procedure for updating the increase correction value; FIG. 4 is a flowchart showing the idle state determination procedure; FIGS. The figure shows the idle switch output, idle discrimination signal, and soft idle time chart for the throttle signal output value.
The figure shows the time chiroute when the accelerator pedal is pressed to start, and the time chart for idling to soft 1. Figures 7 and 8 show the conventional minimum memory value for the throttle signal output and the comparison reference value for idle judgment. , and the soft idol's time chiro? - It is. 9... Throttle sensor, 10... Idle switch, 30... Idle switch state determination means, 31.
. . . Minimum value updating means, 32 . . . Minimum value storage means, 35
... Increased correction value updating means, 36... Increased correction value storage means, 37... Comparison standard 1 setting means, 38... Idle state determination means, A, B... Offset value, THV
...Throttle signal output value, THV D...Increase correction value, THV HIM...Memory minimum value, THV
ISW... Comparison reference value for idle judgment, THVS.
...Set value, TIME...Predetermined time. Figure 4

Claims (1)

[Scope of Claims] Idle switch state determining means for determining a mechanical idle state from an output signal of an idle switch; If it is determined, the throttle signal output value of the throttle sensor indicating the throttle opening is compared with the stored minimum value stored in the minimum value storage means, and if the throttle signal output value is closer to the closing side than the stored minimum value, minimum value updating means for updating the stored minimum value stored in the minimum value storage means with the throttle signal output value; and the idle switch state determining means determines the mechanical idle state, and the throttle signal output value is a comparison reference. If the state continues for a predetermined period of time on the open side from the comparison reference value for idle judgment set by the value setting means, the increase correction value stored in the increase correction value storage means is changed to the value obtained by adding the set value to this increase correction value. increased correction value updating means for initializing the increased correction value stored in the increased correction value storage means when the idle switch state determination means determines that mechanical idle has been released; and a comparison reference value setting means for setting a comparison reference value for idle judgment by adding the increase correction value stored in the increase correction value storage means and the set offset value to the stored minimum value; An engine idle determination device comprising an idle state determining means for determining an idle state by comparing a set comparison reference value for idle determination with the throttle signal output value.