JPH07167026A - Idle adjusting device - Google Patents

Abstract

PURPOSE:To hasten a rise in temperature of engine cooling water, and thereby enhance warm-up performance by providing a control means which controls ignition timing to be fixed at an initial value, or to be delayed in angle with respect to the initial value until an engine is completely warmed up in all the range of rotation when a diag monitor terminal is turned on. CONSTITUTION:The control section 24 which has the specified amount of fuel injected out of an inject 12, and concurrently has an ignition plug ignited at proper, timing sets ignition timing at an initial value when an initial setting terminal (A terminal) is turned on, and concurrently when a specified condition is established. Meanwhile, when the specified condition is not established, and when a diag monitor terminal (B terminal) is in operation, a map timing advance value is determined based on an idle revolution feedback control map as an ignition timing, so that the ignition timing is controlled at the time of warming-up. Namely, when the B terminal is in operation, ignition timing is so controlled as to be fixed at the initial value set in advance, or to be delayed than the initial value in all the range of rotation until an engine is completely warmed up, so that warm-up time is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle adjusting device, and more particularly to a control means for rapidly changing an internal combustion engine from a cold state to a complete warming state and shortening the time until the idle adjustment is started after the complete warming up state. Regarding the idle adjusting device.

[0002]

2. Description of the Related Art In an internal combustion engine, when the engine cooling fan is rotated from a cold state to a completely warmed state,
There are things that adjust the idle. The idle adjuster is
The terminals of the diagnosis monitor coupler are short-circuited to adjust the idling speed and ignition timing to proper conditions.

Further, the idling control device for an internal combustion engine is provided with a bypass passage bypassing the intake throttle valve of the intake passage, and an idle speed control valve (VSV) for idle speed control (ISC) is provided in the middle of the bypass passage. ) Is provided and the idle speed control valve is feedback-controlled according to the idling operation state, thereby increasing or decreasing the intake air amount in the bypass passage to control the idle speed.

As the idle adjusting device, Japanese Patent Application Laid-Open No. Hei 2
There is one disclosed in Japanese Patent Laid-Open No. 305347. The engine ignition timing and idle speed adjustment device disclosed in this publication can individually set the ignition timing adjustment mode and the idle speed adjustment mode by giving an ON / OFF signal to the two service terminals. In the ignition timing adjustment mode, the ignition timing is fixed to the reference ignition timing, and the idle speed is controlled to increase as needed. In the idle speed adjustment mode, the idle speed control valve (ISC valve) is fully closed. As a result, the ignition timing is controlled to be more advanced than usual, so that the adjustment accuracy of the ignition timing adjustment and the idle speed adjustment can be improved, and the workability thereof is improved.

[0005]

By the way, in the conventional idle adjusting device, the ON / OFF signals from the A terminal which is the initial setting terminal and the B terminal which is the diagnostic terminal and the signal from the idle switch (ID SW) are controlled. The ignition timing from the cold state to the warm state of the internal combustion engine is controlled by inputting it to the control unit as means.

That is, to explain with reference to the control flowchart of FIG. 5, when the internal combustion engine is driven, the control flowchart starts (300), the monitor output is turned off, and ESA control is performed (302).

Then, it is judged (304) whether or not the A terminal, which is the terminal for initial setting, is ON.
If this determination (304) is YES, it is determined whether the B terminal, which is a diagnostic terminal, is ON (306).
To determine whether the A terminal is ON (30
Even when 4) is NO, it is judged whether or not the B terminal, which is a diagnostic terminal, is ON (308).

If the judgment (306) is NO, it is judged whether or not a predetermined condition, that is, the condition is satisfied (31).
0), and if this determination (310) is YES, the ignition timing is fixed to a preset initial value (312), and it is determined whether or not the A terminal is ON (304). At the same time as returning, when the determination (310) is NO, the map advance value that is more advanced than the initial value is determined from the idle speed feedback control map as the ignition timing, and normal ignition timing control is performed. , 304 is returned to the determination (304) as to whether the A terminal is ON.

Here, it is judged that the above condition is satisfied when the following two points are satisfied.・ Idle switch (ID SW) is ON ・ Engine speed ≤2000 rpm

If the judgment as to whether the above-mentioned B terminal is ON (306) is YES, the monitor output for idle speed control (ISC) is turned ON (314) and the judgment is made again ( 306).

Further, if the judgment (308) as to whether the B terminal, which is a diagnostic terminal, is ON, is YES,
Turn on the monitor output for the air-fuel ratio (A / F) (31
6), Judgment as to whether or not the B terminal is ON (30
Return to 8), and if the judgment (308) as to whether the B terminal is ON or not is NO, the monitor output is turned OFF.
The process returns to the process (302) of performing F and performing ESA control.

However, when starting the idle adjustment,
Although it must be in a fully warmed-up state, it takes a long time from the cold state of the internal combustion engine to the fully warmed-up state because the ignition timing is controlled as a map advance value at the start of warm-up operation. However, there is an inconvenience that the idle adjustment inevitably takes a long time, which is disadvantageous in practical use.

[0013]

In order to eliminate the above-mentioned inconvenience, the present invention sets the ignition timing to an initial value when the initial setting terminal only is turned on and when a predetermined condition is satisfied, In the idle adjusting device having a control means for determining the ignition timing by determining the map advance value from the idle rotation speed feedback control map when the above condition is not satisfied and the ON operation of the diagnosis terminal, ON of diagnostic terminal
During operation, a function for controlling the ignition timing to be fixed to the initial value or retarded from the initial value to shorten the warm-up time is added to the control means until the engine is fully warmed up in the entire rotation range. Is characterized by. Also, the ignition timing is set to the initial value when only the initial setting terminal is turned on and when the predetermined condition is satisfied, and when the predetermined condition is not satisfied and the diagnostic terminal is turned on, the map is advanced from the idle speed feedback control map. In an idle adjusting device having a control means for controlling the ignition timing at the time of warm-up by determining a value as an ignition timing, in at least one terminal of the initial setting terminal and the diagnostic terminal, when in an ON operation, in the entire rotation range. It is characterized in that a function for controlling the ignition timing to be fixed to the initial value and shortening the warm-up time until the complete warm-up state is added to the control means.

[0014]

According to the invention as described above, when the diagnosis terminal is turned on, the control means controls the ignition timing to be fixed to the initial value or delayed from the initial value until the warm-up state is achieved in the entire rotation range. , The warm-up time is shortened.

Further, when at least one of the initial setting terminal and the diagnostic terminal is turned on, the ignition timing is controlled by the control means to be fixed to the initial value until the temperature is completely warmed up in the entire rotation range. The machine time is shortened.

[0016]

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

1 to 3 show a first embodiment of the present invention. In FIG. 2, 2 is an internal combustion engine, 4 is an intake passage, and 6 is an exhaust passage.

The intake passage 4 has an air cleaner 8 at its upstream end and communicates at its downstream end with a combustion chamber (not shown) of the internal combustion engine 2. An intake throttle valve 10 is provided in the intake passage 4.

The internal combustion engine 2 has a combustion chamber (not shown).
The injector 12 is provided in the intake passage 4 so as to be directed to the. The injector 12 is connected to a fuel tank (not shown) by a fuel passage (not shown). In the fuel tank, a fuel pump (not shown) that supplies the fuel to the fuel passage is provided. Also, in the middle of the fuel passage,
Regulator valve 1 for adjusting fuel pressure by intake pressure in intake passage 4
4 are provided. The adjusting valve 14 adjusts the fuel pressure in the fuel passage to a predetermined pressure and returns excess fuel to the fuel tank through a return passage (not shown).

Further, in the intake passage 4, the intake throttle valve 1
A bypass passage 16 that bypasses 0 is provided. The bypass passage 16 has one end communicating with the intake passage 4 upstream of the intake throttle valve 10 and the other end reaching a combustion chamber (not shown) downstream of the intake throttle valve 10. I have contacted 4. An idle rotation speed control valve 18 that is feedback-controlled so that the engine speed becomes a predetermined engine speed during idle operation of the internal combustion engine 2 is provided in the bypass passage 16.

A throttle sensor 20 for detecting the throttle opening of the intake throttle valve 10 is provided in the intake passage 4. Further, the internal combustion engine 2 includes a rotation angle sensor 2
Two are provided. These various sensors 20, 22 are
It is connected to the input side of the control unit 24 which is the control means.

On the input side of the control unit 24, an A terminal which is an initial setting terminal, a B terminal which is a diagnostic terminal, and an ID which causes a detection signal from the throttle sensor 20 to function as an idle switch (ID SW) S
The W terminal and the battery 26 are connected to each other.

Further, the injector 12 and a fuel pump (not shown) are connected to the output side of the control unit 24, respectively, and an ISC (idle speed / not shown) is provided on the output side of the control unit 24. A control) monitor and an air-fuel ratio (A / F) monitor are connected to each other.

As a result, the control section 24 outputs an injection valve drive signal to the injector 12 based on signals input from various sensors, a pump drive signal to the fuel pump, and an ignition command signal to the ignition coil 28. It outputs and injects the fuel corresponding to the proper basic injection amount from the injector 12, and a spark plug (not shown)
Properly fire. Further, the control unit 24 controls the internal combustion engine 2
During the idling operation, the opening / closing operation of the idle speed control valve 18 is feedback-controlled so that the engine speed becomes a predetermined engine speed, and the amount of air passing through the bypass passage 16 is adjusted.

Then, the control section 24 sets the ignition timing to the initial value when only the A terminal which is the initial setting terminal is turned on and when the condition which is the predetermined condition is satisfied, and when the condition is not satisfied and when the diagnosis terminal ON
During operation, the map advance value is determined from the idle speed feedback control map to set the ignition timing to control the ignition timing during warm-up operation, but when the B terminal, which is the diagnostic terminal, is ON, full rotation is performed. The ignition timing is fixed to a preset initial value or retarded from the initial value until the warm-up state is reached in the range, and a function for reducing the warm-up time is added.

More specifically, the initial value preset in the control unit 24, the map advance value Y, and the B terminal ON.
When the delay angle value X during operation is compared, the delay angle value X during ON operation of the B terminal is set to a value that satisfies the relationship of X ° cA ≦ initial value <Y ° cA.

The above condition is judged to be satisfied when the following two points are satisfied.・ Idle switch (ID SW) is ON ・ Engine speed ≤2000 rpm

Next, the operation will be described with reference to the control flowchart of FIG.

When the internal combustion engine is driven, the control flowchart starts (100), the monitor output is turned off, and ES
A control is performed (102).

Then, it is judged (104) whether or not the A terminal, which is the terminal for initial setting, is ON.
If this determination (104) is YES, it is determined whether the B terminal, which is a diagnostic terminal, is ON (106).
To determine whether the A terminal is ON (10
Even if 4) is NO, it is judged whether the B terminal, which is a diagnostic terminal, is ON (108).

When the judgment (106) as to whether the B terminal is in the ON operation is NO, the process moves to a predetermined condition, that is, a judgment (110) as to whether or not the condition is satisfied, and this judgment (110) is performed. ) Is YES, the ignition timing is fixed to a preset initial value (112), and the process returns to the determination (104) as to whether the A terminal is ON, and the determination (110) is NO. In this case, a map advance value that is more advanced than the initial value is determined from the idle speed feedback control map as the ignition timing, normal ignition timing control is performed, and whether or not the A terminal is turned on. It returns to the judgment (104).

If the determination (106) as to whether the above-mentioned B terminal is in the ON operation is YES, the retard value X ° when the B terminal is in the ON operation in the entire rotation range including the ignition timing. It is fixed to cA (114) and the monitor output for idle speed control (ISC) is turned on (11
6), Judge whether the B terminal is ON operation (10
Returned to 6).

Furthermore, if the judgment (108) as to whether the B terminal, which is the diagnostic terminal, is ON, is YES,
The ignition timing is fixed to the retard value X ° cA during the ON operation of the B terminal in the whole rotation range (118), and the air-fuel ratio (A /
The monitor output for F) is turned on (120), the process returns to the determination (108) as to whether the B terminal is on, and at the same time it is determined whether the B terminal is on (10).
If 8) is NO, monitor output is turned off and ESA
The process is returned to the control process (102).

As a result, when the B terminal, which is a diagnostic terminal, is turned on, the ignition timing is controlled to be fixed to a preset initial value or retarded from the initial value until a complete warm-up state is achieved in the entire rotation range. As a result, the combustion temperature rises due to the retard control, and as shown by the one-dot chain line in FIG. 3, the engine coolant temperature rise can be made faster than before, and the warm-up time can be shortened until the idle adjustment starts. The wasteful time can be reduced, which is practically advantageous.

Further, since it can be dealt with only by changing the program in the control section 24, there is no fear that the configuration becomes complicated, the cost can be kept low, and it is economically advantageous.

Further, when a measure such as racing is performed to shorten the time from the cold state of the internal combustion engine to the complete warm-up state, if the B terminal, which is a diagnostic terminal, is turned ON, the map advance angle is increased. The ignition timing can be fixed to an initial value that is on the retard side relative to the value or to a retarded state relative to the initial value, the combustion temperature is high, and the warm-up time is shortened. Moreover, without taking measures such as racing,
Even when completely warming up while leaving the idle (ID), if the B terminal, which is a diagnostic terminal, is turned on, the ignition temperature is fixed at a timing retarded from the initial value, so the combustion temperature is high, Warm-up time can be shortened.

FIG. 4 shows a second embodiment of the present invention.

The feature of the second embodiment is that the terminal A for initial setting and the terminal B for diagnostics are used.
When at least one of the terminals is turned on, the control unit (not shown) controls the ignition timing to be fixed to the initial value until the engine is completely warmed up in the entire rotation range.

That is, the control flowchart will be described with reference to FIG.

When the internal combustion engine is driven, the control flow chart starts (200), the monitor output is turned off, and ES
A control is performed (202).

Then, it is judged (204) whether the terminal A, which is the terminal for initial setting, is ON,
If this determination (204) is YES, the ignition timing is fixed to the initial value in the entire rotation range (20).
6), it is judged whether the terminal B, which is a diagnostic terminal, is in the ON operation (208). If the judgment (204) is whether the terminal A is in the ON operation, the diagnostic terminal B is the diagnostic terminal B. Determining whether the terminal is ON (21
0) is performed.

If the determination (208) as to whether the B terminal is in the ON operation is NO, the process returns to the determination (204) as to whether the A terminal is in the ON operation and the determination (20).
If 8) is YES, the monitor output for idle speed control (ISC) is turned on (21
2) Determining whether the A terminal is ON (20
Returned to 4).

Furthermore, if the determination (210) as to whether the B terminal, which is a diagnostic terminal, is ON, is YES,
The ignition timing is fixed to the initial value in the entire rotation range (214), and the monitor output for the air-fuel ratio (A / F) is set to O.
The N operation is performed (216), the process returns to the determination (204), and it is determined whether the B terminal is in the ON operation (210).
If NO, the monitor output is turned off and the process is returned to the process (202) of performing ESA control.

By the way, the terminal A for the initial set is
When at least one of the terminal and the B terminal, which is a diagnostic terminal, is turned on, the control unit (not shown) can control the ignition timing to be fixed to the initial value until the engine is in a completely warmed state in the entire rotation range. The combustion temperature rises due to the initial value on the retard side relative to the advance value, so that the engine cooling water temperature can be raised faster than before and the warm-up time can be shortened, as in the first embodiment. This can be shortened, and the wasteful time until the start of idle adjustment can be shortened, which is practically advantageous.

Further, since it is possible to deal with it only by changing the program in the control unit, there is no fear of complicating the structure, the manufacture is easy, the cost can be kept low, and it is economically advantageous. is there.

Further, in the case where a measure such as lacing for shortening the time from the cold state of the internal combustion engine to the fully warmed state is taken, at least the A terminal as the initial setting terminal and the B terminal as the diagnostic terminal are used. If one terminal is turned on, the ignition timing can be fixed to the initial value on the retard side compared to the map advance value, the combustion temperature is high,
The warm-up time is shortened.

The present invention is not limited to the first and second embodiments described above, and various application modifications are possible.

For example, in the first embodiment of the present invention, the ignition timing is controlled to be fixed to the initial value or retarded from the initial value, and in the second embodiment, the ignition timing is fixed to the initial value. It is also possible to control the ignition timing by fixing the ignition timing only to the retarded state until the engine cooling water temperature or other engine atmosphere temperature rises and a predetermined idle adjustment condition is obtained.

[0049]

As described in detail above, according to the present invention, the ignition timing is fixed to the initial value or retarded from the initial value until the warm-up state is achieved in the entire rotation range when the diagnosis terminal is turned on. Since the function of controlling and shortening the warm-up time is added to the control means, when the diagnostic terminal is turned on, the ignition timing is fixed to a preset initial value until the warm-up state is reached in the entire rotation range. It can be controlled to retard the initial value, the combustion temperature rises by the retard control, the temperature of the engine cooling water can rise faster than before, the warm-up time can be shortened, and the idle adjustment can be started. The wasteful time can be reduced, which is practically advantageous. Further, since it is possible to deal with it only by changing the program in the control means, there is no fear that the configuration becomes complicated, the cost can be kept low, and it is economically advantageous.

Further, when at least one of the initial setting terminal and the diagnostic terminal is turned on, the ignition timing is controlled so as to be fixed to the initial value until the engine is completely warmed up in the entire rotation range, and the warming-up time is shortened. Since the function is added to the control means, at least one of the initial setting terminal and the diagnostic terminal is turned on,
The control means can control the ignition timing to be fixed to the initial value until the engine is completely warmed up in the entire rotation range, and the combustion temperature is increased by the initial value on the retard side relative to the map advance value, The cooling water temperature can be raised faster than before, and the warm-up time can be shortened.
It is possible to reduce the wasteful time until the start of idle adjustment, which is practically advantageous. Since it can be dealt with only by changing the program in the control means, there is no fear of complicating the configuration, the cost can be kept low, and it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a control flowchart of an idle adjusting device showing a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an idle adjustment device.

FIG. 3 is a diagram showing a relationship between engine speed and time.

FIG. 4 is a control flowchart of an idle adjusting device showing a second embodiment of the present invention.

FIG. 5 is a control flowchart of an idle adjusting device showing a conventional technique of the present invention.

[Explanation of symbols]

 2 internal combustion engine 4 intake passage 6 exhaust passage 8 air cleaner 10 intake throttle valve 12 injector 14 adjusting valve 16 bypass passage 18 idle speed control valve 20 throttle sensor 22 rotation angle sensor 24 control unit 26 battery 28 ignition coil

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[Procedure amendment]

[Submission date] February 2, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 3]

[Figure 4]

[Figure 1]

[Fig. 2]

[Figure 5]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02D 45/00 314 C G01M 15/00 Z

Claims (2)

[Claims] 1. When the ignition timing is set to an initial value when only the initial setting terminal is turned on and when a predetermined condition is satisfied, the idle speed feedback control map is set when the predetermined condition is not satisfied and the diagnosis terminal is turned on. In an idle adjusting device having a control means for determining a map advance value and setting it as an ignition timing and controlling an ignition timing during warm-up operation, when the diagnosis terminal is turned on, ignition is performed until a complete warm-up state is achieved in all rotation ranges. An idle adjusting device provided with a function of controlling the time to be fixed to the initial value or being retarded from the initial value to shorten the warm-up time by adding to the control means. 2. When the ignition timing is set to an initial value when only the initial setting terminal is turned on and when a predetermined condition is satisfied, the idle speed feedback control map is set when the predetermined condition is not satisfied and the diagnostic terminal is turned on. In an idle adjustment device having a control means for controlling the ignition timing during warm-up operation by determining the map advance value and setting the ignition timing, when at least one of the initial setting terminal and the diagnostic terminal is in the ON operation, An idle adjusting device provided with the function of shortening the warm-up time by controlling the ignition timing to be fixed to the initial value until a complete warm-up is performed in the rotation range.