JP3235313B2 - Open / close control device for swirl control valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an opening and closing control device for a swirl control valve.

[0002]

2. Description of the Related Art As a method for obtaining stable combustion from a low speed, a swirl control valve for restricting intake air drawn into a combustion chamber in accordance with operating conditions to generate an appropriate swirl (swirl flow) in the combustion chamber. Is valid.

[0003] As a conventional swirl control valve, there is a swirl control valve which is rotatably supported on a suction passage via a rotary shaft and has a cutout formed at one end thereof so as to be offset with respect to a center line of the suction passage. The swirl control valve throttles the intake air taken into the combustion chamber when the valve is closed, thereby increasing the flow velocity of the intake air taken into the combustion chamber from the intake port, thereby generating swirl in the combustion chamber.

As a conventional swirl control valve opening / closing control device, a negative pressure actuator for opening / closing the swirl control valve is provided, and a suction pressure generated downstream of the throttle valve in the intake passage as a driving pressure of the negative pressure actuator is provided by a solenoid valve. (See JP-A-62-17318).

[0005]

However, in such a conventional swirl control valve opening / closing control apparatus, the suction negative pressure generated downstream of the throttle valve in the intake passage decreases the atmospheric pressure. When the engine is operated in a place where the atmospheric pressure is low, such as at a high altitude, the negative pressure guided to the negative pressure actuator is weakened even in a predetermined low load range in which the swirl control valve is closed. The actuator may not be able to open the swirl control valve against the built-in spring.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent an opening / closing operation failure of a swirl control valve caused by a decrease in atmospheric pressure.

[0007]

According to the first aspect of the present invention,
As shown in FIG. 1, a swirl control valve 21 for adjusting the speed of the intake air flowing into the combustion chamber, a negative pressure actuator 22 for opening and closing the swirl control valve 21, and a drive pressure of the negative pressure actuator 22 Valve means 25 for guiding the suction negative pressure generated downstream of the throttle valve 24; and opening / closing control means 27 for the swirl control valve 21 for introducing the suction negative pressure to the negative pressure actuator 22 via the valve means 25 according to the engine operating state. in opening and closing control device of the swirl control valve comprising bets, and means 28 for detecting the atmospheric pressure, the air
The negative pressure guided to the negative pressure actuator 21 as the pressure decreases
When the suction negative pressure rises sufficiently in response to the
Operation range of negative pressure actuator 21 is limited to engine operation range
As shown in FIG.
Engine that introduces suction negative pressure into the engine to limit the engine operating range
Regulation value determining means 29 for determining the regulation value of the load .

The swirl control valve opening / closing control device according to claim 2 is as shown in FIG.
In the invention, the means 31 for detecting the engine speed
If, fuel intake negative pressure under normal atmospheric pressure in accordance with the engine rotational speed reaches the required negative pressure required for operation of the negative pressure actuator
Load calculating means 32 for calculating the pulse width of fuel injection
And the regulation value determining means 29 calculates the calculated fuel injection
The regulation value is determined according to the pulse width and the atmospheric pressure .

[0009] switching controller for swirl control valve according to claim 3, wherein, as shown in FIG. 2, according to claim 1, wherein
In the invention, the means 31 for detecting the engine speed
The suction negative pressure reaches the required negative pressure required to operate the negative pressure actuator under the standard atmospheric pressure according to the engine speed .
An engine load calculating means 42 for calculating the rottle opening;
The restriction value determination means 29 is provided with the calculated throttle opening.
The regulation value is determined according to the degree and the atmospheric pressure .

[0010]

The swirl control valve opening / closing control device according to the first aspect of the present invention provides a negative pressure actuator which responds to a decrease in the suction negative pressure guided to the negative pressure actuator 22 under the same load condition as the atmospheric pressure decreases. By restricting the operation range of the engine 22 to a low load region in which the suction negative pressure generated downstream of the throttle valve 24 is sufficiently increased, when the engine is operated at a low atmospheric pressure such as high altitude, the negative pressure actuator 22 Can be prevented from malfunctioning.

According to a second aspect of the present invention, there is provided a swirl control valve opening / closing control device which detects an engine speed and adjusts a suction negative pressure at a standard atmospheric pressure according to the engine speed.
The fuel injection pallet reaches the required negative pressure required for eta operation.
The fuel injection pulse width and the calculated fuel injection pulse width
By determining the regulation value in accordance with the atmospheric pressure, it is possible to avoid a malfunction of the negative pressure actuator 22 when the engine is operated at a low atmospheric pressure such as at high altitude.

According to a third aspect of the present invention, there is provided a swirl control valve opening / closing control device, which detects an engine speed and adjusts the suction negative pressure to a negative pressure at a standard atmospheric pressure according to the engine speed.
Throttle opening reaching required negative pressure required for eta operation
And the calculated throttle opening and atmospheric pressure.
By determining the appropriate value accordingly, it is possible to avoid malfunction of the negative pressure actuator when the engine is operated in a place where the atmospheric pressure is low, such as at high altitude.

[0013]

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

In FIG. 4, 1 is an engine body, 10 is an intake passage, and 18 is an exhaust passage. A fuel injection valve 3 for injecting fuel is installed in the intake passage 10. Exhaust passage 18
Is provided with a three-way catalyst 19.

A swirl control valve 13 is provided immediately upstream of the intake port 12. The swirl control valve 13 has a notch that collects intake air when the valve is closed, and increases the flow rate of intake air flowing into the outer peripheral portion of the combustion chamber by passing the intake air through the notch to generate swirl in the combustion chamber. It is supposed to.

The swirl control valve 13 is driven to open and close via a diaphragm actuator (negative pressure actuator) 14. Diaphragm actuator 14
Is selectively connected to the downstream side and the upstream side of the throttle valve 5 of the intake passage 10 via a solenoid valve (valve means) 15.

When an SCV open signal is sent from the control unit 2, the solenoid valve 15 is de-energized, and is switched to a position for introducing a substantially atmospheric pressure generated upstream of the throttle valve 5 into the diaphragm chamber. As a result, the diaphragm actuator 14 holds the throttle valve 5 at the open position by the urging force of the spring interposed therein.

When the SCV closing signal is sent from the control unit 2, the solenoid valve 15 is energized and switched to a position for introducing a suction negative pressure generated downstream of the throttle valve 5 into the diaphragm chamber. Thereby, the diaphragm actuator 14 closes the swirl control valve 13 while compressing the spring interposed therein. Intake passage 10 downstream of throttle valve 5 and solenoid valve 15
Between them, a vacuum tank 16 is installed via a one-way valve 17.

A control unit 2 is provided to control the injection amount from the fuel injection valve 3 and to control the opening and closing of the swirl control valve 13. For this control, the control unit 2 controls the intake air amount detected by the air flow sensor 4, the engine speed detected by the speed sensor 7, the engine coolant temperature detected by the engine coolant temperature sensor 8, and the engine speed of the throttle sensor 6. The opening degree of the throttle valve 5 to be detected, the air-fuel ratio of the air-fuel mixture supplied to the combustion chamber detected by the wide area air-fuel ratio sensor 9, the running speed of the vehicle detected by the vehicle speed sensor 10, the battery voltage, and signals of the ignition switch are input. I do.

As shown in FIG. 5, in the control unit 2, when the basic pulse width Tp of fuel injection is set to K as a constant from the intake air amount Q and the rotation speed N, Tp = K · Q / N (1) calculate.

Based on the calculated value Tp and the fuel-air ratio correction coefficient DML, the pulse width JTp of the fuel injection is calculated as JTp = Tp · DML (2).

The control unit 2 switches the target air-fuel ratio between the stoichiometric air-fuel ratio and the lean air-fuel ratio in accordance with the contents of a preset map, and performs feedback control of the actual air-fuel ratio in accordance with the detection value of the wide-range air-fuel ratio sensor 9. .

In the control unit 2, the swirl control valve 13 is basically controlled according to the FLG1 based on the fuel injection pulse width JTp and the FLG2 based on the throttle opening TVO in order to control the opening and closing of the swirl control valve 13. The operating range in which the valve is opened and the operating range in which the valve is closed are determined.

If it is determined from the FLG1 map that the pulse width JTp of the fuel injection becomes longer than the predetermined value TpSCV, FLG1 = 1. If it is determined that the pulse width JTp of the fuel injection is shorter than the predetermined value TpSCV-HVS, FLG1 = 0.

If it is determined from the FLG2 map that the throttle valve opening TVO becomes larger than the predetermined value TVSCV, FLG2 = 1. If it is determined that the throttle valve opening TVO becomes shorter than the predetermined value TVSCV-HYSV, FLG2 = 0.

When FLG1 = 1 or FLG2 = 1, an SCV open signal is sent to the solenoid valve 15. That is, the swirl control valve 13 is opened under operating conditions in which at least one of the fuel injection pulse width JTp and the throttle opening TVO is larger than the predetermined value.

In the conventional apparatus, when FLG1 = 0 and FLG2 = 0, the solenoid valve 15
A CV close signal is sent. That is, under the operating conditions in which both the pulse width JTp of the fuel injection and the throttle opening TVO are equal to or less than the predetermined value, the swirl control valve 13
Is closed.

However, as shown in FIG. 6, the suction negative pressure generated downstream of the throttle valve 5 in the intake passage 10 decreases in proportion to the decrease of the atmospheric pressure. When the engine is operated, even if the pulse width JTp of the fuel injection becomes shorter than the predetermined value TpSCV, the negative pressure guided to the diaphragm actuator 14 is weakened, and the diaphragm actuator 14 closes the swirl control valve 13 against the spring. The valve cannot be driven.

To cope with this, the present invention is provided with an atmospheric pressure sensor 11 for detecting the atmospheric pressure.
Limits the operating range in which the swirl control valve 13 is closed based on the detected value ATM of the atmospheric pressure by the atmospheric pressure sensor 11.

The fuel injection pulse width TpSCW for generating the required negative pressure under the standard atmospheric pressure is searched from the map of TpSCW according to the engine speed N. In the map of TpSCW, the fuel injection pulse width TpSCW for generating the required negative pressure under the standard atmospheric pressure according to the engine speed N is stored in advance.

A correction coefficient KTpSCATM is retrieved from the KTpSCATM map according to the detected value of the atmospheric pressure ATM. In the map of KTpSCATM, a correction coefficient KTpSCATM is stored in advance according to the detected value ATM of the atmospheric pressure.

The swirl control valve 13
Is calculated as TpSONLMT = TpSCW.KTpSCATM (3).

If it is determined from the map of FLG3 that the basic pulse width Tp of fuel injection becomes longer than the regulation value TpSONLMT + HVS, FLG3 = 1. Then, the basic pulse width Tp of the fuel injection becomes equal to the regulation value TpSONL.
If it is determined to be shorter than MT, FLG3 = 0.

FLG1 = 0 and FLG2 = 0 and FLG
When 3 = 0, an SCV close signal is sent to the solenoid valve 15. That is, the pulse width JTp of the fuel injection
Even if both the throttle opening TVO and the throttle opening TVO become equal to or less than a predetermined value, the SCV close signal is sent to the solenoid valve 15 unless the basic pulse width Tp of the fuel injection becomes equal to or less than the regulation value TpSONLMT based on the atmospheric pressure. There is no.

In this way, even under the same load condition, the closed area of the swirl control valve 13 is shifted downstream from the throttle valve 5 in response to the decrease in the negative pressure guided to the diaphragm actuator 14 as the atmospheric pressure decreases. The diaphragm actuator 14 can open the swirl control valve 13 against the spring by limiting the suction load to a low load region where the suction negative pressure generated on the side is sufficiently increased. When the engine is operated in a place where the atmospheric pressure is low, such as at a high altitude, it is possible to avoid the malfunction of the diaphragm actuator 14 and prevent the engine operability from deteriorating.

Next, another embodiment shown in FIG. 7 will be described.

From the TVSCW map, a throttle opening TVSCW for generating the required negative pressure under the standard atmospheric pressure according to the engine speed N is searched. In the TVSCW map, the throttle opening TVSCW for generating the required negative pressure under the standard atmospheric pressure according to the engine speed N is stored in advance.

A correction coefficient KTVSCATM is retrieved from the KTVSCATM map according to the detected value of the atmospheric pressure ATM. In the map of KTVSCATM, a correction coefficient KTVSCATM is stored in advance in accordance with the detected value ATM of the atmospheric pressure.

Then, the swirl control valve 13
Is calculated as TVSONLMT = TVSCW.multidot.KTVSCATM (4).

If it is determined from the FLG3 map that the throttle opening TVO for fuel injection becomes longer than the regulation value TVSONLMT + HVS, FLG3 = 1.
Then, the throttle opening TVO becomes equal to the regulation value TVSONLM.
If it is determined to be shorter than T, FLG3 = 0.

FLG1 = 0 and FLG2 = 0 and FLG
When 3 = 0, an SCV close signal is sent to the solenoid valve 15. That is, the pulse width JTp of the fuel injection
Even if both the throttle opening TVO and the throttle opening TVO become equal to or less than the predetermined value, the SCV closing signal is not sent to the solenoid valve 15 unless the throttle opening TVO becomes equal to or less than the regulation value TVSONLMT based on the atmospheric pressure.

In this manner, even under the same load condition, the closed area of the swirl control valve 13 is shifted downstream from the throttle valve 5 in response to the decrease in the negative pressure guided to the diaphragm actuator 14 as the atmospheric pressure decreases. The diaphragm actuator 14 can open the swirl control valve 13 against the spring by limiting the suction load to a low load region where the suction negative pressure generated on the side is sufficiently increased. When the engine is operated in a place where the atmospheric pressure is low, such as at a high altitude, it is possible to avoid the malfunction of the diaphragm actuator 14 and prevent the engine operability from deteriorating.

[0043]

As described above, the swirl control valve opening / closing control device according to the first aspect of the present invention can cope with a decrease in the suction negative pressure guided to the negative pressure actuator under the same load condition as the atmospheric pressure decreases. Since the operation range of the negative pressure actuator is limited to an operation range in which the suction negative pressure generated downstream of the throttle valve is sufficiently increased, when the engine is operated at a low atmospheric pressure such as high altitude, It is possible to avoid a malfunction of the negative pressure actuator and prevent the engine operability from deteriorating.

A swirl control valve opening / closing control device according to a second aspect of the present invention detects an engine speed, and in accordance with the engine speed , reduces a suction negative pressure under standard atmospheric pressure to a required negative pressure required for operation of a negative pressure actuator. Fuel injection
Calculate the fuel injection pulse width and the calculated fuel injection pulse width.
And the regulation value according to the atmospheric pressure, when the engine is operated at a low atmospheric pressure such as high altitude,
It is possible to avoid a malfunction of the negative pressure actuator.

A swirl control valve opening / closing control device according to a third aspect of the present invention detects an engine speed, and in accordance with the engine speed , reduces the suction negative pressure under standard atmospheric pressure to a required negative pressure required for the operation of the negative pressure actuator. Throttle opening
Calculate the throttle opening and the calculated atmospheric pressure
By determining the appropriate value in accordance with the above, it is possible to avoid a malfunction of the negative pressure actuator 22 when the engine is operated at a low atmospheric pressure such as at high altitude.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims of the invention described in claim 1;

FIG. 2 is a diagram corresponding to claims of the invention described in claim 2;

FIG. 3 is a diagram corresponding to claims of the invention described in claim 3;

FIG. 4 is a system diagram showing an embodiment of the present invention.

FIG. 5 is a flowchart showing the same control contents.

FIG. 6 is a characteristic diagram showing the relationship between atmospheric pressure and suction negative pressure.

FIG. 7 is a flowchart showing control contents in another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Swirl control valve 22 Negative pressure actuator 23 Intake passage 24 Throttle valve 25 Valve means 27 Swirl control valve opening / closing control means 28 Atmospheric pressure detection means 29 Regulation value determination means 31 Engine speed detection means 32 Engine load calculation means reaching required load 33 Regulation value determination means 42 Throttle opening degree calculation means reaching required negative pressure 43 Regulation value determination means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F02B 31/00 331 F02D 11/08 F02D 35/00 364 F02D 45/00 312 F02D 45/00 360

Claims (3)

(57) [Claims] A swirl control valve for adjusting the speed of intake air flowing into the combustion chamber; a negative pressure actuator for opening and closing the swirl control valve; and a driving pressure of the negative pressure actuator generated downstream of the throttle valve in the intake passage. and valve means for guiding the intake negative pressure, the opening and closing control device of the swirl control valve and a switching control means of the swirl control valve for introducing the intake negative pressure through the valve means to a negative pressure actuator according to the engine operating conditions, a large Means for detecting atmospheric pressure, and negative pressure guided to a negative pressure actuator as atmospheric pressure decreases
When the suction negative pressure rises sufficiently in response to the
The operation range of the negative pressure actuator is limited to the engine operation range
To the negative pressure actuator according to the atmospheric pressure.
Engine load to limit the engine operating range
A swirl control valve opening / closing control device, comprising: a regulation value determining means for determining a regulation value . 2. A means for detecting an engine speed , and a fuel injection device in which an intake negative pressure reaches a required negative pressure required for operation of a negative pressure actuator under standard atmospheric pressure according to the engine speed.
Engine load calculating means for calculating the pulse width of
The regulation value determining means calculates the pulse width of the calculated fuel injection.
2. The swirl control valve opening / closing control device according to claim 1, wherein the regulation value is determined in accordance with the pressure and the atmospheric pressure . 3. A slot means for detecting the engine speed, the intake negative pressure under normal atmospheric pressure according to the engine rotational speed reaches the required negative pressure required for operation of the negative pressure actuator
Throttle opening calculating means for calculating the tor opening,
The regulation value determining means calculates the calculated throttle opening and atmospheric pressure.
The swirl control valve opening / closing control device according to claim 1, wherein the control value is determined in accordance with the control value .