JPH0454050B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a device for controlling fuel and air supplied to an internal combustion engine such as an automobile engine, and the present invention relates to a device for controlling fuel and air supplied to an internal combustion engine such as an automobile engine. The present invention relates to a fuel control device that provides the following.

(Prior Art) As a fuel control device for internal combustion engines such as automobile engines, a system has been developed that effectively supplies additional air when the internal combustion engine decelerates in order to prevent exhaust pollution caused by an overly rich mixture. ing. For example, there is an intake system for a multi-cylinder internal combustion engine described in Japanese Patent Application Laid-Open No. 55-35180.

The intake system of this multi-cylinder internal combustion engine has an intake passage and its on-off valve that connect each cylinder of the internal combustion engine and a fuel supply device, and an atmospheric air intake pipe and its on-off valve connected downstream of this on-off valve. Based on the difference between the air pressure and atmospheric pressure in the intake passage, that is, the magnitude of negative pressure, and the rotation speed of the internal combustion engine,
It opens and closes the intake passage and the atmosphere suction pipe passage.

(Problems to be Solved by the Invention) However, in the intake system for the multi-cylinder internal combustion engine described in the above publication, the intake passage is always closed if the magnitude of the negative pressure in the intake passage is equal to or greater than a predetermined value. On the other hand, only when the magnitude of the negative pressure in the intake passage is equal to or greater than a predetermined value and the rotational speed of the internal combustion engine is equal to or greater than a predetermined value, the passage of the atmospheric air intake pipe is opened. That is, the opening and closing of the intake passage and the opening and closing of the atmospheric air intake pipe are controlled independently.

In this way, the opening and closing of the intake passage does not depend on the rotational speed of the internal combustion engine, so in normal idling operating conditions, the intake passage is closed due to the large negative pressure within the intake passage. That is, the passage from the carburetor to the internal combustion engine is closed by two passage control valves: the throttle valve and the intake passage opening/closing valve. For this reason, a pressure difference occurs between the two passage control valves, reducing the flow velocity when passing through each passage control valve, further reducing atomization during idling, where atomization is difficult to achieve, and improving idling. There was a problem that the driving condition could not be maintained.

Furthermore, since the opening and closing of each passage is controlled by diaphragm operation using negative pressure, the control conditions change due to temperature changes and altitude differences, and it is difficult to correct them.

Therefore, in the present invention, it is possible to save fuel and prevent an overly rich mixture when decelerating an internal combustion engine, to obtain an effective engine braking effect and a quick acceleration response when accelerating again, and to maintain a stable idling operating state. It is an object of the present invention to provide a fuel control device that can easily compensate for temperature changes and altitude differences.

(Means for Solving the Problems) Therefore, in order to solve the above problems, the present invention provides an apparatus for controlling the amount of fuel and air supplied to an internal combustion engine, which includes cylinders of the internal combustion engine and fuel supply. an atmospheric air suction pipe connected to the air intake pipe immediately before the entrance to the cylinder, and a passage that opens and closes the passage of the air suction pipe and the passage of the air intake pipe immediately before the air suction pipe joint part of the air intake pipe; a switching device; an actuator that switches the passage switching device;
a throttle switch that detects an idle opening state of a throttle valve of the fuel supply device and outputs a corresponding signal; a rotation speed sensor that detects the rotation speed of the internal combustion engine and outputs a corresponding signal;・When the switch outputs a signal corresponding to the idle opening of the throttle valve, and the rotation speed sensor outputs a signal corresponding to a rotation speed of a certain value or more, actuate the actuator. The present invention has created a fuel control device characterized in that it has a control circuit that closes the passage of the intake pipe and opens the passage of the atmospheric air intake pipe.

(Function) According to the fuel control device configured as described above, when the internal combustion engine is in a deceleration state, the intake pipe is closed to save fuel, and the atmosphere is introduced from the atmosphere intake pipe to reduce the intake negative air. The pressure is reduced and an effective engine braking effect is obtained. Since a fuel mixture is stored in the intake pipe, when the intake pipe valve is opened during re-acceleration, this fuel mixture provides a rapid acceleration response.

Furthermore, when the internal combustion engine is in idling operation, the throttle valve is at the idling opening, but the rotational speed of the internal combustion engine is below a certain value, so the intake pipe passage is open and the atmosphere intake pipe passage is closed. is maintained. As a result, a pressure difference due to the passage control valve is generated only at one location, resulting in a large pressure difference, which improves atomization in the carburetor and ensures a stable idling operating state.

Since such control is performed using electrical signals, electronic circuits, and electromagnetic actuators, corrections for temperature changes and altitude differences can be easily performed.

In this way, the aforementioned objectives are achieved.

(Example) The present invention will be described below based on drawings showing examples. FIG. 1 is a schematic diagram of a fuel control device according to the present invention, in which 1 is an engine cylinder, 2 is an intake pipe, and 3 is a schematic diagram of a fuel control device according to the present invention.
4 is a fuel supply device, 4 is a throttle valve, 5 is an air cleaner, and 6 is an exhaust pipe. Reference numeral 7 denotes an atmospheric air intake pipe, one end of which is connected to the side wall opening of the intake pipe 2 just before the inlet of cylinder 1, and the other end is connected to the air cleaner 5 to connect cylinder 1 to cylinder 1.
Atmospheric air is introduced into the inlet of the An intake pipe gate valve 8 is provided in the intake pipe passage just before the joint of the atmospheric suction pipe 7, and an atmospheric suction pipe gate valve 9 is installed at the opening of the joint of the atmospheric suction pipe 7. Also, the atmosphere intake pipe 7
An electromagnetic solenoid 10 that opens and closes the intake pipe gate valve 8 and the atmosphere intake pipe gate valve 9 is attached to the joint portion. Reference numeral 11 denotes a control circuit which receives the opening signal of the throttle valve 4 sent from the throttle switch 12 and the engine speed signal sent from the rotation speed sensor 13, inputs a control signal to the electromagnetic solenoid 10, and controls the gate valve 8. and 9. The throttle switch 12 is set to be turned on when the throttle valve 4 is at an idle opening, and turned off at other times. When the control circuit 11 receives an ON signal from the throttle switch 12 and an engine rotation speed signal higher than the set idle rotation speed from the rotation speed sensor 13, it sends a control signal to the electromagnetic solenoid 10 to close the intake pipe gate valve 8. close,
The atmosphere suction pipe gate valve 9 is set to open.

FIG. 3 shows an embodiment of the control circuit 11. When the throttle valve 4 is at the idle opening, the throttle switch 12 is turned on and its output signal is sent to the AND circuit 1.
1a. On the other hand, the rotation speed signal from the rotation speed sensor 13 is converted into a voltage by the F-V conversion circuit 11b, and this voltage is compared with the set rotation speed equivalent voltage _VN by the comparison circuit 11e. It is output to the circuit 11a. When the ON signal of the idle opening and the positive signal of the engine speed are aligned, the AND circuit 11a outputs,
The electromagnetic solenoid 10 is operated by the drive circuit 11d, the intake pipe gate valve 8 is closed, and the atmosphere intake pipe gate valve 9 is opened.

When a vehicle equipped with a fuel control device configured as described above is decelerated by decelerating the accelerator,
An idle opening signal of the throttle valve 4 is sent from the throttle switch 12 to the control circuit 11. While the engine speed signal from the speed sensor 13 is higher than the set idle speed, the control circuit 11 outputs a drive signal to the electromagnetic solenoid 10, closes the intake pipe gate valve 8, and releases the air to the atmosphere. Open the suction pipe gate valve 9. As a result, the intake of the air-fuel mixture from the intake pipe 2 to the cylinder 1 is cut off, and the intake of the air-fuel mixture from the atmospheric intake pipe 7 to the cylinder 1 is blocked.
Atmospheric air is introduced into the inlet of the Therefore, the air-fuel mixture downstream of the fuel supply device 3 is stored in the intake pipe 2, wasteful combustion is stopped, and the air-fuel mixture is prevented from becoming too rich. On the other hand, the atmospheric air sucked into cylinder 1 reduces the intake negative pressure and improves the effectiveness of the engine brake.

Next, when the accelerator is turned on and acceleration is performed again, the off signal of the throttle switch 12 is turned on to the control circuit 1.
As a result, the air intake pipe gate valve 9 is closed, the intake pipe gate valve 8 is opened, and the air-fuel mixture is supplied to the cylinder 1. During this re-acceleration, the air-fuel mixture from before the deceleration operation is stored in the intake pipe 2, and is drawn into the cylinder 1 at the same time as the re-acceleration, resulting in a quick acceleration response.

FIG. 2 shows an embodiment in which the passage of the intake pipe 2 and the opening of the atmospheric air intake pipe 7 are alternately opened and closed by one gate valve 14. The gate valve 14 closes the joint opening of the atmosphere intake pipe 7 during acceleration and steady operation, and closes the passage of the intake pipe 2 immediately before the atmosphere intake pipe joint during deceleration, thereby diverting the atmosphere from the atmosphere intake pipe 7 to the cylinder 1. be introduced at the entrance.

In addition to the embodiments described above, the atmosphere intake port of the atmosphere intake pipe 7 shown in FIG. 1 may be opened to a dedicated air cleaner. Furthermore, the driving conditions of the electromagnetic solenoid 10 are as follows:
An engine intake negative pressure signal from a vacuum switch may be used instead of the throttle valve opening, and a vehicle speed signal from a vehicle speed sensor may be used instead of the engine speed. More detailed control is also possible by adding the temperature of the intake pipe 2 and the temperature of the engine coolant to the two signals of the above-described embodiment as driving conditions for the electromagnetic solenoid 10.

(Effects of the Invention) The present invention includes a passage switching device that opens and closes the passage of the intake pipe and the passage of the atmosphere suction pipe, and when the engine speed is low and the throttle is closed, the passage of the intake pipe is By creating a fuel control device that closes the passage and opens the passage for the atmospheric intake pipe, it saves fuel when decelerating the internal combustion engine, prevents an overly rich mixture, and provides effective engine braking.
Not only can a quick acceleration response be achieved during re-acceleration, but also a good idling state can be maintained, and corrections for temperature changes and altitude differences can be easily made.

Therefore, it is a practical fuel control device that provides good drivability during deceleration and idling of the internal combustion engine.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a partially cutaway schematic diagram of a fuel control device according to the invention, Fig. 2 is a vertical cross-sectional view of a main part of another embodiment, and Fig. 3 is a control circuit diagram. be. 2... Intake pipe, 7... Atmospheric intake pipe, 8... Intake pipe gate valve, 9... Atmospheric intake pipe gate valve, 10... Electromagnetic solenoid, 11... Control circuit, 12... Throttle switch, 13 ...Rotation speed sensor, 14
...Gate valve.

Claims (1)

[Scope of Claims] 1. A device for controlling the amount of fuel and air supplied to an internal combustion engine, the device being connected to an intake pipe connecting a cylinder of the internal combustion engine and a fuel supply device immediately before the entrance to the cylinder. a passage switching device that reversely opens and closes a passage of the atmospheric suction pipe and a passage immediately before the atmospheric suction pipe joint of the intake pipe; an actuator that switches the passage switching device; and an actuator that switches the passage switching device; a throttle switch that detects the idle opening state of a throttle valve of the supply device and outputs a corresponding signal; a rotation speed sensor that detects the rotation speed of the internal combustion engine and outputs a corresponding signal; and the throttle switch. When a signal corresponding to the idle opening degree of the throttle valve is outputted by the throttle valve, and a signal corresponding to the rotational speed equal to or higher than a certain value is outputted by the rotational speed sensor, the actuator is actuated to A fuel control device comprising: a control circuit that closes a passage in an intake pipe and opens a passage in the atmosphere intake pipe.