JPH07324669A - Ignition timing controller - Google Patents

Abstract

PURPOSE:To improve fuel consumption as well as to enhance operating performance by decreasing the engine speed through a process of delaying the idling ignition timing when the engine speed becomes the specific value or more and when an ISC duty value becomes the ISC duty lower limit value or less in also idling and in stopping of a vehicle. CONSTITUTION:A complete warming time detecting means 48 for detecting the complete warming state of an internal combustion engine 4 is provided, and an idle detecting means 50 and a car speed sensor 52 are provided, and the idle engine speed is controlled by a control means 54 to which the detected signals are to be input by opening and closing an ISC valve 24 in a bypass passage 22 detouring around a throttle valve 18 by an ISC duty value. At this time, when the engine speed becomes the specific value or more and the ISC duty value becomes the ISC duty lower limit value or less in idling and also in stopping of the vehicle in the complete warming state, the idling ignition timing is delayed and controlled. Thereby, the engine speed in idling is decreased, and fuel consumption can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition timing control device, and more particularly to an ignition timing control system which corrects an idling ignition timing according to an engine speed and an ISC duty value to secure an optimum engine speed and an ISC duty value. The present invention relates to a timing control device.

[0002]

2. Description of the Related Art An ignition timing control device for an internal combustion engine sets an ignition timing according to an idle speed, which is an engine speed during idle operation, a water temperature, which is a cooling water temperature, etc., and sets the set ignition timing to an idle operation state, that is, a load. Correction control is performed depending on the presence or absence of.

Further, when controlling the idle operation state of the internal combustion engine, the throttle valve is opened / closed only when the throttle opening is idle, or the air bypass air amount is controlled by bypassing the throttle valve. There is.

For example, a control device for controlling the amount of air bypass air is generally provided with a bypass passage bypassing the intake throttle valve of the intake passage, and an idle speed control valve (ISC valve) which is a solenoid valve is provided in the middle of the bypass passage.
By providing feedback control of this idle speed control valve with the ISC duty value according to the idling operation state, the intake air amount in the bypass passage is increased or decreased.

An example of the ignition timing control device is Japanese Patent Laid-Open No.
There is one disclosed in Japanese Patent Publication No. 269377. The ignition timing control method for low engine speed disclosed in this publication is an ignition timing control method for feedback controlling idle speed to a target speed by adjusting an amount of bypass air bypassing a throttle valve. When the start operation is performed in the state where is lower than the set number of revolutions, the ignition timing is delayed compared with the time of idling, the fuel efficiency at the time of idling is improved, and the occurrence of engine stall at the time of start operation is reduced. The startability is improved.

Further, there is one disclosed in Japanese Patent Laid-Open No. 54-26138. The ignition timing control device disclosed in this publication is a control device that accelerates warm-up by increasing the intake air amount and increasing the idle speed when the engine is cold.
When the vehicle traveling speed becomes equal to or higher than a predetermined value during the engine warm-up operation for increasing the idle speed, the ignition timing is delayed to control the increase of the engine torque.

[0007]

By the way, the conventional ignition timing control device controls the idle speed to a target value preset in the control means. When the adjustment is misaligned or when the idle adjustment is improper, the idle speed is controlled to a value deviating from the target value.

As a result, if the idle speed is controlled to a value that deviates from the target value, the fuel efficiency deteriorates, which is economically disadvantageous, and the drivability deteriorates, and further, vibration is caused. As a result, there is a disadvantage that it is disadvantageous in practical use.

Further, when the ISC duty value for opening and closing the idle speed control valve becomes the lower limit value or the upper limit value, the general control means controls the idle speed exceeding the lower limit value or the upper limit value. It can not be performed, the control of the idle speed is suppressed, the control operation is continued in the state where there are inconveniences such as deterioration of fuel consumption, deterioration of drivability, and induction of vibration,
Improvement was desired.

[0010]

Therefore, in order to eliminate the above-mentioned inconvenience, the present invention provides an idle speed control valve in the middle of an air passage for supplying air by bypassing the throttle valve to the internal combustion engine, and at the same time, the idle speed control valve is provided. In a control device having control means for opening and closing a control valve according to an ISC duty value to control an engine speed during idling, a warm-up time detecting means for detecting a warm-up state of the internal combustion engine is provided,
An idle detection means for detecting an idling state is provided, and a vehicle speed sensor for detecting a vehicle speed is provided. When the engine is idling in the fully warmed state and the vehicle is stopped, the engine speed is equal to or higher than a predetermined value and the ISC duty value is equal to or lower than the ISC duty lower limit. In this case, the control means is additionally provided with a function of performing correction control so as to retard the idling ignition timing to reduce the engine speed during idling.

Further, an idle speed control valve is provided in the middle of the air passage for supplying air to the internal combustion engine to bypass the throttle valve, and the idle speed control valve is opened / closed according to the ISC duty value to change the engine speed during idling. In a control device provided with control means for controlling, a fully warmed-up time detection means for detecting a fully warmed-up state of the internal combustion engine, an idle detection means for detecting an idling state, and a vehicle speed sensor for detecting a vehicle speed are provided. When the engine speed is equal to or lower than a predetermined value and the ISC duty value is equal to or higher than the ISC duty upper limit value during idling in the fully warmed state and the vehicle is stopped, the idling ignition timing is advanced to set the engine speed during idling. The function of correction control to raise Characterized by providing in addition to the serial controller.

[0012]

With the invention as described above, when the engine speed is equal to or higher than a predetermined value and the ISC duty value is equal to or lower than the ISC duty lower limit value during idling in the fully warmed-up state and when the vehicle is stopped, the idling is performed by the control means. The ignition timing is retarded and correction control is performed to reduce the engine speed during idling, improving driving performance and improving fuel efficiency.

Further, when the engine is idling in the fully warmed-up state and the vehicle is stopped, the engine speed is below a predetermined value and IS
When the C duty value becomes equal to or higher than the ISC duty upper limit value, the control means advances the idling ignition timing and performs correction control to increase the engine speed during idling to improve driving performance and fuel consumption. It is good.

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

1 and 2 show an embodiment of the present invention. In FIG. 2, 2 is an ignition timing control device, 4 is an internal combustion engine, 6 is an intake manifold, and 8 is an exhaust manifold.

An intake passage 10 is connected to the internal combustion engine 4, and the intake passage 10 connects a first intake passage 10-in an intake pipe 14 that connects an air cleaner 12 and an intake manifold 6.
1, and a second intake passage 10-2 in the intake manifold 6,
The internal combustion engine 4 includes an intake port 16.

A throttle valve 18 is provided on the upstream side of the intake manifold 6, and a throttle sensor 20 for detecting the throttle opening degree of the throttle valve 18 is provided.

Further, a bypass passage 22 is provided to bypass the throttle valve 18, and an idle speed control valve (ISC valve) 24 for opening and closing the bypass passage 22 to adjust the amount of bypass air is provided in the middle of the bypass passage 22. The idle speed control valve 24 is feedback-controlled by the ISC duty value according to the idling operation state.

Further, in the intake passage 10 on the downstream side of the throttle valve 18, that is, on the intake manifold 6, from the upstream side, a pressure sensor 26 for detecting the intake pipe pressure, an intake temperature sensor 28 for detecting the intake temperature, The fuel injection valves 30 directed to a combustion chamber (not shown) of the internal combustion engine 4 are sequentially arranged.

An exhaust passage 3 is provided on the exhaust side of the internal combustion engine 4.
2 has been contacted. The exhaust passage 32 includes a first exhaust passage 32-1 formed in the exhaust manifold 8 and a catalytic converter 3 disposed downstream of the exhaust manifold 8.
Second exhaust passage 3 formed in the exhaust pipe 36 communicating with
2-2, and an oxygen sensor 38 for detecting the oxygen concentration in the exhaust gas is provided in the exhaust manifold 8.

The internal combustion engine 4 has a spark plug 40.
Is provided, and a distributor 42 is connected to the spark plug 40.
2, a crank angle sensor 44 is provided, and an ignition coil 46 is connected and provided.

The fully warmed-up time detecting means 48 for detecting the fully warmed-up state of the internal combustion engine 4, the idle detection means 50 for detecting the idling state, and the vehicle speed sensor 52 for detecting the vehicle speed are provided. A control means 54 for controlling the engine speed during idling by opening / closing the speed control valve 24 according to the ISC duty value is provided.

When the engine is idling in the completely warmed-up state and the vehicle is stopped, the engine speed is equal to or higher than a predetermined value and I
When the SC duty value becomes equal to or lower than the ISC duty lower limit value, the control means 54 is additionally provided with a function of performing correction control so as to retard the idling ignition timing to reduce the engine speed during idling. .

More specifically, a water temperature sensor 56 for detecting the cooling water temperature functions as the fully warmed-up time detection means 48, and the idle sensor 50 serves as the throttle sensor 20.
Alternatively, an idle switch (not shown) of the throttle sensor 20 functions.

The control means 54 includes a throttle sensor 20, an idle speed control valve (I
SC valve) 24, pressure sensor 26, intake air temperature sensor 28, fuel injection valve 30, oxygen sensor 38, crank angle sensor 4
4, an ignition coil 46, a water temperature sensor 56 that functions as a fully warmed-up time detection unit 48, and a vehicle speed sensor 52 are connected to each other.

Further, when the cooling water temperature WT degree from the water temperature sensor 56 functioning as the complete warm-up time detecting means 48 becomes equal to or more than the complete warm-up judgment water temperature t degree, the control means 54 is in the complete warm-up time. Idle switch (S
When W) is turned on, it has a function of determining that the vehicle is idling, and when the vehicle speed = 0 based on the detection signal from the vehicle speed sensor 52, it has a function of determining that the vehicle is stopped.

When the engine is idling in the completely warmed-up state and the vehicle is stopped, the engine speed Ne is a predetermined value, for example, the upper limit value a or more and the ISC duty value Dut.
When y becomes equal to or less than the ISC duty lower limit value x, the control means 54 retards the idling ignition timing to perform correction control so as to reduce the engine speed during idling.

Further, when the engine is idling in the completely warmed-up state and the vehicle is stopped, the engine speed is below a predetermined value and IS
When the C duty value becomes equal to or higher than the ISC duty upper limit value, the control means 54 is additionally provided with a function of performing correction control so as to advance the idling ignition timing to increase the engine speed during idling. .

More specifically, when the engine is idling in the completely warmed-up state and the vehicle is stopped, the engine speed Ne is a predetermined value, for example, a lower limit value b (a> b) or less and the ISC duty value Duty is the ISC duty upper limit value y. (X <
y) In the case of the above, the control means 54 advances the idling ignition timing to perform correction control so as to increase the engine speed during idling.

The actual retarding or advancing control of the idling ignition timing θ is performed from the idling ignition timing θ by 1
(° C A) or 1 at idling ignition timing θ
(° C A).

Next, the operation will be described with reference to the control flowchart of the ignition timing control device 2 of FIG.

For example, when the control program is started (100) by driving the internal combustion engine 4, the water temperature sensor 56
Is input to determine whether the cooling water temperature WT degree is equal to or higher than the complete warm-up determination water temperature t degree (102).

When the determination (102) is NO, the determination is repeated until the determination (102) becomes YES, and when the determination (102) is YES, that is, when the warm-up is completed, the idle switch ( Based on the detection signal from the vehicle speed sensor 52 that the SW) is ON and the vehicle speed = 0, it is judged (104).

When the determination (104) is NO, the determination is repeated until the determination (104) becomes YES. When the determination (104) is YES, that is, when the engine is idling and the vehicle is stopped, the engine speed is increased. It is judged whether Ne is not less than the upper limit value a and the ISC duty value Duty is not more than the ISC duty lower limit value x (106).

If the determination (106) is YES, 1 (° C. A) is subtracted from the idling ignition timing θ to retard the idling ignition timing θ (108), and the idling ignition timing θ is retarded before ignition. Timing control (110) is performed, and the above-described idle switch (SW) is turned on and the detection signal from the vehicle speed sensor 52 is used to return to the determination (104) as to whether vehicle speed = 0.

If the judgment (106) is NO,
The engine speed Ne is set to the lower limit value b or less and the ISC duty value Duty is set to the ISC duty upper limit value y or more (112), and this determination (112) is NO.
In the case of, the ignition timing control (110) is performed without changing the idling ignition timing θ, and
When the determination (112) is YES, the idling ignition timing θ is set to 1 to advance the idling ignition timing θ.
(° C A) is added (114), the idling ignition timing θ is advanced, and then the ignition timing control (110) is performed.

As a result, the idling ignition timing can be retarded according to the engine speed and the ISC duty value, the optimum engine speed and ISC duty value can be secured, and the driving performance is improved. Yes,
In addition to being practically advantageous, the fuel economy can be improved, which is economically advantageous.

Further, since it is possible to deal with the retard correction control of the idling ignition timing by only changing the control program in the control means 54, there is no fear that the configuration becomes complicated and the cost can be kept low. It is a thing.

Further, when the engine speed Ne is equal to or higher than the upper limit value a and the ISC duty value Duty is equal to or lower than the ISC duty lower limit value x, the idling ignition timing is retarded and corrected, thereby reducing the engine speed during idling. It is possible to make it practically advantageous.

Furthermore, the idling ignition timing can be advanced and corrected in accordance with the engine speed and the ISC duty value, and the optimum engine speed and ISC duty value can be secured to improve the driving performance. In addition, the fuel economy can be improved, which is economically advantageous.

Further, as with the retard correction control, it is possible to deal with the advance correction control of the idling ignition timing by only changing the control program in the control means 54, which may complicate the configuration. In addition, the cost can be kept low.

Further, when the engine speed Ne is less than or equal to the lower limit value b and the ISC duty value Duty is greater than or equal to the ISC duty upper limit value y, the idling ignition timing is advanced and corrected to control the engine speed during idling. It is possible to make it practically advantageous.

Furthermore, by making the water temperature sensor 56 for detecting the cooling water temperature function as the complete warm-up time detecting means 48, the complete warm-up state of the internal combustion engine can be surely detected by the water temperature, and the control reliability can be improved. Contributes to the improvement of sex.

The throttle sensor 20 or the throttle sensor 20 is used as the idle detecting means 50.
By operating the idle switch (not shown), the idling state can be reliably detected, and the reliability of control can be improved.

Further, since the vehicle speed can be detected by the vehicle speed sensor 52, the stop of the vehicle can be surely detected, which contributes to the improvement of the control reliability.

The present invention is not limited to the above-mentioned embodiment, but various application modifications are possible.

For example, in the embodiment of the present invention, by subtracting 1 (° C. A) from the idling ignition timing θ or adding 1 (° C. A) to the idling ignition timing θ when a predetermined condition is satisfied. Although the retarding or advancing correction control of the idling ignition timing θ is performed, when the prescribed condition is satisfied, the idling ignition timing θ is retarded or advanced by first skipping by a prescribed value,
After this skip processing, the idling ignition timing θ becomes 1
(° C A) or 1 at idling ignition timing θ
(° C A) by adding idling ignition timing θ
It is also possible to adopt a configuration in which the retard angle or advance angle correction control is performed. Then, it is possible to make the control responsive.

[0047]

As described above in detail, according to the present invention, the complete warm-up time detecting means for detecting the complete warm-up state of the internal combustion engine, the idle detecting means for detecting the idling state, and the vehicle speed are provided. A vehicle speed sensor to detect
When the engine is idling in the fully warmed-up state and the vehicle is stopped, the engine speed is equal to or higher than a predetermined value and the ISC duty value is I.
When the SC duty lower limit value or less is reached, the function of correcting the idling ignition timing by retarding it to reduce the engine speed during idling is added to the control means. The idling ignition timing can be retarded according to the value and the optimum engine speed and the ISC duty value can be secured, and the driving performance can be improved, which is advantageous in practical use, and the fuel consumption can be improved. Can be good and economically advantageous. Further, since the retard correction control of the idling ignition timing can be dealt with only by changing the control program in the control means, there is no fear that the configuration becomes complicated and the cost can be kept low. Further, when the engine speed is equal to or higher than the predetermined value and the ISC duty value is equal to or lower than the ISC duty lower limit value, the retarding correction control of the idling ignition timing can be performed to reduce the engine speed during idling. It is advantageous.

Further, a fully warmed-up time detecting means for detecting a fully warmed-up state of the internal combustion engine, an idle detection means for detecting an idling state, and a vehicle speed sensor for detecting a vehicle speed are provided so as to detect the fully warmed-up state. When the engine speed is equal to or lower than a predetermined value and the ISC duty value is equal to or higher than the ISC duty upper limit value during idling and when the vehicle is stopped, correction control is performed to advance the idling ignition timing to increase the engine speed during idling. Since the function was added to the control means, the engine speed and IS
The idling ignition timing can be advanced in accordance with the C duty value, the optimum engine speed and the ISC duty value can be secured, the driving performance can be improved, and the fuel consumption can be improved. , Economically advantageous. Further, since the advance angle correction control of the idling ignition timing can be dealt with only by changing the control program in the control means, there is no fear that the configuration becomes complicated and the cost can be kept low. Further, when the engine speed is equal to or lower than a predetermined value and the ISC duty value is equal to or higher than the ISC duty upper limit value, the engine speed during idling can be increased by performing advance angle correction control of the idling ignition timing. It is advantageous.

[Brief description of drawings]

FIG. 1 is a control flowchart of an ignition timing control device showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an ignition timing control device.

[Explanation of symbols]

2 Ignition timing control device 4 Internal combustion engine 6 Intake manifold 8 Exhaust manifold 10 Intake passage 18 Throttle valve 20 Throttle sensor 22 Bypass passage 24 Idle speed control valve (ISC)
26) Pressure sensor 28 Intake temperature sensor 30 Fuel injection valve 32 Exhaust passage 34 Catalytic converter 38 Oxygen sensor 40 Spark plug 42 Distributor 44 Crank angle sensor 46 Ignition coil 48 Complete warm-up detection means 50 Idle detection means 52 Vehicle speed sensor 54 Control Means 56 Water temperature sensor

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F02D 43/00 L

Claims (2)

[Claims] 1. An internal combustion engine is provided with an idle speed control valve in the middle of an air passage for supplying air by bypassing a throttle valve, and the idle speed control valve is opened / closed by an ISC duty value to control the engine speed at idling. In a control device provided with control means for controlling, a fully warmed-up time detection means for detecting a fully warmed-up state of the internal combustion engine, an idle detection means for detecting an idling state, and a vehicle speed sensor for detecting a vehicle speed are provided. When the engine speed is equal to or higher than a predetermined value and the ISC duty value is equal to or lower than the ISC duty lower limit value during idling in the fully warmed-up state and the vehicle is stopped, the idling ignition timing is retarded to set the engine speed during idling. The function to perform correction control to reduce An ignition timing control device characterized by being provided in addition to the control means. 2. An internal combustion engine is provided with an idle speed control valve in the middle of an air passage for supplying air by bypassing a throttle valve, and the idle speed control valve is opened / closed by an ISC duty value so that the engine speed at idling is controlled. In a control device provided with control means for controlling, a fully warmed-up time detection means for detecting a fully warmed-up state of the internal combustion engine, an idle detection means for detecting an idling state, and a vehicle speed sensor for detecting a vehicle speed are provided. When the engine speed is equal to or lower than a predetermined value and the ISC duty value is equal to or higher than the ISC duty upper limit value during idling in the fully warmed state and the vehicle is stopped, the idling ignition timing is advanced to set the engine speed during idling. The function to perform correction control to increase An ignition timing control device characterized by being provided in addition to the control means.