JPH0539735A - Throttle valve opening degree controller - Google Patents

Abstract

(57) [Summary] [Object] The present invention can secure a throttle opener function and a dashpot function only by providing a negative pressure delay valve in the negative pressure passage between the negative pressure switching valve and the actuator. , The structure is simpler than the conventional one, the manufacturing is easy, the cost is low, it is economically advantageous, and the dashpot is not equipped with the idle speed control (ISC). The purpose is to be able to secure the function. Therefore, a throttle opener actuator is provided in communication with the throttle valve, a negative pressure passage is provided for connecting the actuator and an intake passage downstream of the throttle valve, and a negative pressure switching valve is provided in the middle of the negative pressure passage. If a negative pressure delay valve is provided in the middle of the negative pressure passage between the negative pressure switching valve and the actuator, and the set opening for starting the throttle opener function is set as the starting opening and the starting opening exceeds the throttle opening. A control unit is provided to perform a dashpot function by the negative pressure delay valve so as to delay the return operation of the throttle valve to the idle opening degree.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle valve opening control device, and more particularly to a throttle valve opening control for controlling a throttle valve opening to be larger than an idle opening for a predetermined time according to the temperature of cooling water at the time of starting. The present invention relates to a throttle valve opening control device that exhibits an opener function.

[0002]

2. Description of the Related Art In recent years, there have been increasing demands for lower fuel consumption of automobiles due to energy circumstances, and various measures for lowering fuel consumption and purification of exhaust gas have been proposed together with tightening of exhaust gas regulations. ing. One of the measures is to precisely control the throttle valve opening according to various conditions of the internal combustion engine, such as the temperature of engine cooling water.

An actuator having a throttle opener function is used in the throttle valve opening control device of this measure, and the throttle valve opening should be made larger than the idle opening for a predetermined time according to the cooling water temperature at the time of starting. To control.

As a throttle valve opening control device for the internal combustion engine, there is one disclosed in Japanese Patent Application Laid-Open No. 59-185854. The air-fuel ratio control device for deceleration disclosed in this publication has a fuel cut valve, an idle up mechanism, and an idle switch, respectively, and switches the fuel cut valve by a signal from the idle switch and operates the idle up mechanism. The idle switch is formed by the operating member, the driven member and the biasing member, and the opening signal is sent to the control unit only when the driven member is held at the most forward position with respect to the operating member. It is outputting.

Further, there is one disclosed in JP-A-60-47855. The throttle valve control device for an internal combustion engine disclosed in this publication is provided with first and second actuating rods connected in series so as to hold the carburetor throttle valves at different opening positions, respectively. The first and second negative pressure passages communicate the chamber with the intake passages on the downstream side of the throttle valve, and the first and second negative pressure passages are provided with first and second control means for controlling the supply and discharge of negative pressure, respectively. Intervening,
The carburetor throttle valve is opened in two stages by the operation of one actuator.

[0006]

In the conventional throttle valve opening control device, as shown in FIG. 6, 202 is a throttle valve opening control device for an internal combustion engine (not shown), 204 is a throttle body, and 206 is an intake manifold. 208 are throttle valves.

A throttle opener actuator 210 is provided in communication with the throttle valve 208, and a negative pressure chamber 212 of the actuator 210 and an intake passage 214 downstream of the throttle valve 208 are provided in communication with each other through a negative pressure passage 216.

In the middle of the negative pressure passage 216, a negative pressure switching valve (VS
V, vacuum switching valve) 218 is provided, and the negative pressure passage 216 connects the negative pressure passage 2 with the intake passage 214 downstream of the throttle valve 208 and the negative pressure switching valve 218.
16-1, negative pressure switching valve 218 and actuator 210
And a second negative pressure passage 216-2 communicating with the negative pressure chamber 212.

The negative pressure switching valve 218 is connected to the control unit 226, and a water temperature sensor 228 for detecting the cooling water temperature, an ignition coil 230, a starter motor 234, an ignition switch 236, a battery 238, and an injector. 240 are respectively connected.

However, it is general that the above-mentioned actuator functions only as a throttle opener and uses an idle speed control (ISC) as a dashpot function.

As a result, the actuator and the idle speed control (ISC) are provided respectively, and the structure is complicated, the manufacturing is difficult, the cost is high, and it is economically disadvantageous.

Further, in the case of not equipped with the idle speed control (ISC), it is possible to add a dashpot function, and HC measures at the time of deceleration cannot be fulfilled, which is disadvantageous in practical use. is there.

[0013]

Therefore, according to the present invention, in order to eliminate the above-mentioned inconvenience, the throttle valve opening is controlled to be larger than the idle opening for a predetermined time according to the cooling water temperature at the time of starting. In a throttle valve opening control device having a throttle opener function, a throttle opener actuator is provided in communication with the throttle valve, and a negative pressure passage is provided to connect this actuator and an intake passage on the downstream side of the throttle valve. A negative pressure switching valve is provided in the negative pressure switching valve, and a negative pressure delay valve is provided in the negative pressure passage between the negative pressure switching valve and the actuator. When the throttle valve opening exceeds the throttle valve opening degree, the negative pressure delay valve performs a dashpot function to delay the return operation of the throttle valve to the idle opening degree. Characterized in that a control unit.

[0014]

With the above-described invention, when the throttle valve opening exceeds the start opening, the negative pressure delay valve causes the dashpot function to be exerted, and the return operation of the throttle valve to the idle opening is delayed. The throttle opener function and the dashpot function are secured, and the structure is simplified to reduce the cost.

[0015]

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

1 to 5 show an embodiment of the present invention. In FIG. 2, 2 is a throttle valve opening control device (not shown) for an internal combustion engine, 4 is a throttle body, 6 is an intake manifold, and 8 is a throttle valve.

A throttle opener actuator 10 is provided so as to communicate with the throttle valve 8, and the actuator 1
The negative pressure chamber 12 of 0 and the intake passage 14 on the downstream side of the throttle valve 8 are connected by a negative pressure passage 16.

In the middle of the negative pressure passage 16, a negative pressure switching valve (VSV,
A vacuum switching valve) 18 is provided to connect the negative pressure passage 16 to the first negative pressure passage 16-1 that connects the intake passage 14 on the downstream side of the throttle valve 8 and the negative pressure changeover valve 18 and the negative pressure changeover valve 18. And a second negative pressure passage 16-2 communicating with the negative pressure chamber 12 of the actuator 10.

The negative pressure passage 16 between the negative pressure switching valve 18 and the actuator 10, that is, the second negative pressure passage 16
-A negative pressure delay valve (VTV, vacuum transmitting valve) 20 is provided on the way.

The negative pressure delay valve 20 comprises a check valve 22 and an orifice 24 which allow only the flow of air from the negative pressure switching valve 18 side to the actuator 10 side.

Further, the set opening for starting the throttle opener function is set as the starting opening, and when the opening of the throttle valve exceeds this opening, the negative pressure delay valve 20 causes the dashpot function to be exerted. A configuration is provided in which the control unit 26 that controls so as to delay the return operation of the throttle valve 8 to the idle opening degree is provided.

More specifically, the control unit 26 is connected to the negative pressure switching valve 18, and the control unit 26 includes a water temperature sensor 28 for detecting the cooling water temperature, an ignition coil 30, and a throttle position sensor. 32, a starter motor 34, an ignition switch 36, and a battery 38 are connected.

Further, the control unit 26 stores the throttle valve opening θ ₀ when the ignition switch 36 is ON, and sets the opening θ ₁ larger than the throttle valve opening θ _0.
Is set in advance.

Then, the throttle position sensor 32
When the throttle valve opening θ detected by is θ <θ ₁ , the operation start of the throttle opener function can be learned,
When θ ₀ = θ and θ ≧ θ ₁ , learning cannot be performed and θ ₀ = θ ₁ is used.

That is, in the throttle opener function, the negative pressure switching valve 18 is turned on when a preset time has elapsed after the start according to the water temperature at the start, and the opening degree of the throttle valve 8 is changed to the opening degree at the time of idling. Return to the idle opening.

Further, the dashpot function has a starting opening degree equal to the setting opening degree for starting the throttle opener function, and this starting opening degree is set to O of the ignition switch 36.
It is detected by the throttle position sensor 32 at the time of N.

When θ> θ ₀ , the negative pressure switching valve 18 is turned on, the negative pressure chamber 12 of the actuator 10 is opened to the atmosphere, and the opening degree of the throttle valve 8 is returned. = Θ ₀ , the negative pressure switching valve 18 is turned off after a predetermined time Δt ₁ obtained from the map according to the engine speed (E / G RPM) at this time (see FIG. 4). It is operated to apply a negative pressure to the negative pressure chamber 12 of the actuator 10.

At this time, the orifice 24 of the negative pressure delay valve 20 delays the return operation of the throttle valve 8 to the idle opening degree, thereby exhibiting the dashpot function.

Next, the operation will be described with reference to the flow chart for controlling the throttle valve opening in FIG.

When an internal combustion engine (not shown) is started and the control program is started (100), the ignition switch 36 is turned on (102), and the control unit 2 is operated.
6 learns the throttle valve opening θ ₀ when the ignition switch 36 is turned on (104).

The opening θ of the throttle valve 8 and the set opening θ ₁
Is determined to be θ <θ ₁ (106), and if the determination (106) is YES, the start of actuation of the throttle opener function can be learned,
θ ₀ = θ is set (108), and the process proceeds to a determination (110) as to whether or not the throttle opener control is being performed.

If the judgment (106) is NO,
Since we cannot learn, we use θ ₀ = θ ₁ (11
2) Judgment as to whether throttle opener control is in progress (11
0).

If the determination (108) is YES, this control is not performed (114), and is repeatedly performed until the determination (110) is YES. If the determination is NO, whether θ ≦ θ ₀ or not. The determination (116) is made.

When the determination (116) as to whether θ ≦ θ ₀ is NO, the negative pressure switching valve 18 is turned on (11
8) Then, it is judged whether or not θ ≦ θ ₀ (120). When the judgment (120) of θ ≦ θ ₀ is NO, the operation returns to the ON operation (118) of the negative pressure switching valve 18. , a negative pressure switching valve 18 is turned oN only ₁ hour [Delta] T in the case of YES (122), after the lapse of [Delta] T ₁ hour to OFF operation a negative pressure switching valve 18 (124).

Further, even if the judgment (116) as to whether or not θ ≦ θ ₀ is YES, the OF of the negative pressure switching valve 18 is turned off.
The operation moves to the F operation (124).

Next, it is judged whether the ignition switch 36 is in the OFF state (126), and this judgment (1
If 26) is NO, the process returns to the determination (116) as to whether or not θ ≦ θ ₀ , and if YES, the end (12)
Move to 8).

As a result, the negative pressure passage 16 between the negative pressure switching valve 18 and the actuator 10, that is, the second negative pressure passage 1
6-2 Simply by installing a negative pressure delay valve (VTV, vacuum transmitting valve) 20 in the middle, a throttle opener function and a dashpot function can be secured, and the structure is simplified compared to the conventional one. It can be manufactured easily, can be manufactured at low cost, and is economically advantageous.

Further, for example, as shown in FIG. 3, the throttle valve opening Th-θ is closed from the fully closed deceleration start point to θ = θ ₀ at once, and the engine speed N before deceleration is N.
Depending on x, the negative pressure switching valve 18 can be turned on for a period of ΔT ₁ sec and held in the state of θ = θ ₀ , and the decrease in engine speed is gentle, so that ΔT ₁ se
After c, the negative pressure switching valve 18 is turned off and the negative pressure delay valve 2
Even if the throttle valve is slowly returned to the idle opening degree by 0, the engine speed continues to decrease while drawing a gentle curve, and the engine speed can be continuously decreased from the high speed region.

Furthermore, even in the case where the idle speed control (ISC) is not equipped, the dashpot function can be ensured, so that the dashpot effect can be exerted, which is practically advantageous.

[0040]

As described above in detail, according to the present invention, the throttle valve is provided with the throttle opener actuator in communication therewith, and the negative pressure passage communicating with the intake passage downstream of the throttle valve is provided. A negative pressure switching valve is provided in the middle of the negative pressure passage and a negative pressure delay valve is provided in the middle of the negative pressure passage between the negative pressure switching valve and the actuator, and the set opening for starting the throttle opener function is set as the starting opening and the opening is started. If the throttle valve opening exceeds the throttle valve opening degree, the negative pressure delay valve exerts a dashpot function to delay the return operation of the throttle valve to the idle opening. A throttle opener function and a dashpot function can be secured simply by installing a negative pressure delay valve in the middle of the negative pressure passage between the actuators, and the structure can be simplified compared to the conventional one. It becomes easy, and give a cheaper cost, which is economically advantageous. Also, idle speed
Even if the control (ISC) is not equipped, the dashpot function can be ensured, so that the dashpot effect can be exhibited, which is practically advantageous.

[Brief description of drawings]

FIG. 1 is a flow chart for throttle valve opening control of a throttle valve opening control device showing an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a throttle valve opening control device.

FIG. 3 is a time chart for throttle valve opening control of the throttle valve opening control device.

FIG. 4 is a diagram showing a relationship between ΔT ₁ and engine speed.

FIG. 5 is a diagram showing operations of a throttle opener function and a dashpot function when the negative pressure switching valve is turned on and off.

FIG. 6 is a schematic configuration diagram of a throttle valve opening control device showing a conventional technique of the present invention.

[Explanation of symbols]

2 Throttle valve opening control device 4 Throttle body 6 Intake manifold 8 Throttle valve 10 Throttle opener actuator 12 Negative pressure chamber 14 Intake passage 16 Negative pressure passage 16-1 First negative pressure passage 16-2 Second negative pressure passage 18 Negative Pressure switching valve (VSV, vacuum switching valve) 20 Negative pressure delay valve (VTV, vacuum transmitting valve) 22 Check valve 24 Orifice 26 Control unit 28 Water temperature sensor 30 Ignition coil 32 Throttle position sensor 34 Starter motor 36 Ignition Switch 38 battery

Claims (1)

[Claims] 1. A throttle opener control device having a throttle opener function for controlling a throttle valve opening to be larger than an idle opening for a predetermined time according to a cooling water temperature at the time of starting, wherein a throttle opener is provided for the throttle valve. Is connected to the actuator, a negative pressure passage is provided to connect the actuator to the intake passage on the downstream side of the throttle valve, and a negative pressure switching valve is provided in the middle of the negative pressure passage. A negative pressure delay valve is provided in the middle of the negative pressure passage, and the set opening for starting the throttle opener function is set as the starting opening, and when the opening of the throttle valve exceeds this opening, the negative pressure delay valve is used. A throttle valve opening control device comprising a control unit that performs a dashpot function and delays the return operation of the throttle valve to the idle opening.