JP2772967B2 - Idle up control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle-up control device, and more particularly, to a throttle control of an internal combustion engine by an actuator so as to compensate for a decrease in engine speed when an air conditioner operates. The present invention relates to an idle-up control device that puts a valve into an idle-up state.

[Related Art] In an internal combustion engine of a vehicle, an idling rotational speed may be set relatively low in order to purify exhaust gas and reduce fuel consumption. When the idling rotational speed is set to a relatively low value in this way, there is a problem that the engine rotational speed is reduced even by a slight increase in the load, which causes engine malfunction. For example, when the air conditioner is operated during idling operation of the internal combustion engine at the set idling speed,
There is a problem that the engine speed becomes low and the operation state becomes unstable.

Therefore, in order to solve such a problem, when the air conditioner is operating, the intake throttle valve is operated by an actuator that operates at the intake pipe pressure, and the internal combustion engine is brought into an idle-up state in order to compensate for a decrease in the engine speed. There has been proposed an idle-up control device that performs the following.

That is, in the idle-up control device, an actuator for opening and closing the intake throttle valve is provided, and a pressure guiding passage communicating the pressure chamber of the actuator with the intake passage downstream of the intake throttle valve is provided. The pressure passage is provided with an air conditioning idle-up control valve that is turned on and off to control the air pipe pressure from the intake passage to the pressure chamber and operates the actuator, and is turned on and off so that the air conditioning compressor of the air conditioner is turned on and off. An idle-up state of the internal combustion engine, in which the compressor clutch that is turned off and the air-conditioning idle-up control valve is turned on and the intake throttle valve is operated by the actuator, that is, the intake throttle valve closes below a certain opening by the actuator The idle-up control point of the engine speed for releasing / returning the non-operating state is set to the engine speed for idle-up. If the engine speed does not reach the idle-up control point during the operation of the air conditioner with the compressor clutch turned on, the air-conditioning idle-up control valve is turned on and the actuator operates the intake throttle valve. The operation is performed to bring the internal combustion engine into the above-mentioned idle-up state, and when the engine speed reaches the idle-up control point from a state lower than the idle-up control point due to, for example, depression of an accelerator pedal, the air conditioning idle-up The control valve is turned off to release the above-mentioned idle-up state of the internal combustion engine without performing the operation of the intake throttle valve by the actuator, whereby the internal throttle is closed to the predetermined opening or less without being restrained by the intake throttle valve actuator. Operation is possible, and then the accelerator pedal is released, and the engine speed is higher than the idle-up control point. And to return the engine to idle-up state described above is performed the operation of the intake throttle valve by the actuator to turn on the air conditioner idle-up control valve when returning from the stomach state to the idle-up control points. As described above, when the engine speed in the idle-up state of the internal combustion engine in which the air conditioning idle-up control valve is turned on and the intake throttle valve is operated by the actuator reaches the idle-up control point, the compressor clutch is turned on. The reason why the idle-up state of the internal combustion engine is canceled even when the air conditioner is operating in order to improve fuel efficiency and to make engine braking and the like advantageous.

Also, as such an idle-up control device,
For example, it is disclosed in Japanese Utility Model Publication No. 59-14254. The device described in this publication simplifies installation and idle-up adjustment by providing a cooler idle-up actuator with an existing actuator attached as it is.

[Problems to be Solved by the Invention] However, conventionally, in an idle-up control device that brings the internal combustion engine into the above-mentioned idle-up state by the operation of the intake throttle valve when the air conditioner operates, the above-mentioned idle-up state When the engine speed at the time of release returns from the state higher than the idle-up control point to the idle-up control point and returns the internal combustion engine to the above-mentioned idle-up state, the actuator for operating the intake throttle valve is used for air conditioning idle-up. Since the operation is performed according to the intake pipe pressure state due to the ON / OFF of the control valve, the operation delay time of the actuator occurs.At this time, since the air conditioner is continuously operated, for example, the above-described idle-up state If there is sudden deceleration at the time of release, the engine speed temporarily exceeds the engine speed for idle-up. As a result, the engine stall is greatly reduced (indicated by broken lines in FIGS. 2 and 3), which causes an inconvenience of engine stall.

[Object of the Invention] Accordingly, an object of the present invention is to provide an air conditioner for the operation delay time of an actuator when an internal combustion engine is returned from the above-mentioned idle-up state to the above-mentioned idle-up state in order to eliminate the above-mentioned disadvantages. The purpose of the present invention is to realize an idle-up control device capable of temporarily stopping the operation of the engine and preventing the occurrence of engine stall.

Means for Solving the Problems In order to achieve this object, the present invention provides an actuator for opening and closing an intake throttle valve, and connects a pressure chamber of the actuator to an intake passage downstream of the intake throttle valve. An air-conditioning idle-up control valve, which is turned on / off to control the intake pipe pressure from the intake passage to the pressure chamber and operates the actuator, to provide an air-conditioning idle-up control valve; An idle-up state of the internal combustion engine in which a compressor clutch that is turned on and off so as to intermittently turn on and off the air-conditioning compressor of the device is provided, the air-conditioning idle-up control valve is turned on, and the intake throttle valve is operated by the actuator. The idle-up control point of the engine speed at which the engine is released / returned is set higher than the engine speed for idle-up, If the engine speed does not reach the idle-up control point during the operation of the air-conditioning system after the clutch for the unpressor is turned on, the control valve for air-conditioning idle-up is turned on to operate the intake throttle valve by the actuator. The internal combustion engine into the idle-up state, and when the engine speed reaches the idle-up control point from a state lower than the idle-up control point, the air conditioning idle-up control valve is turned off and When the idle-up state of the internal combustion engine is released without performing the operation of the intake throttle valve by the actuator and the engine speed returns to the idle-up control point from a state where the engine speed is higher than the idle-up control point, the air conditioning is performed. The control valve for idling up is turned on to operate the intake throttle valve by the actuator. In the idle-up control device that returns the internal combustion engine to the idle-up state, the compressor clutch is turned on and the engine speed is higher than the idle-up control point when the air conditioner is operating. When returning to the idle-up control point, the air-conditioning idle-up control valve is turned on, the actuator operates the intake throttle valve, and the compressor clutch is turned off to stop the operation of the air conditioner. And control means for turning on the compressor clutch and restarting the air conditioner after a lapse of a predetermined time that is an operation delay time of the actuator from the time when the engine speed returns to the idle-up control point. It is characterized by.

[Operation] According to the configuration of the present invention, when the compressor clutch is turned on and the engine speed returns from the state higher than the idle-up control point to the idle-up control point during the operation of the air conditioner, the air conditioning is performed. The control valve for idle-up is turned on, the intake throttle valve is operated by the actuator, the clutch for the compressor is turned off, the operation of the air conditioner is stopped, and the operation of the actuator is started when the engine speed returns to the idle-up control point. Since the compressor clutch is turned on and the air conditioner is restarted after the elapse of a predetermined time, which is the operation delay time, when the internal combustion engine is returned from the above-mentioned idle-up state to the above-mentioned idle-up state, sudden deceleration, etc. Even if there is, the operation of the air conditioner has been temporarily stopped, It is possible to prevent the engine speed from becoming significantly lower than the engine speed for the engine, thereby preventing the occurrence of engine stall.

Embodiment An embodiment of the present invention will be described below in detail and specifically with reference to the drawings.

1 to 3 show an embodiment of the present invention.
In FIG. 1, 2 is an internal combustion engine mounted on a vehicle, 4 is an intake passage, 6 is a venturi section, and 8 is an intake throttle valve. The intake throttle valve 8 is opened and closed by an actuator 16 via first and second levers 12 and 14 pivotally connected at a pivot portion 10.

The actuator 16 has a pressure chamber 22 and an atmosphere chamber 24 defined by a diaphragm 20 in a housing 18. The second lever 14 is fixed to the diaphragm 20 on the atmosphere chamber 24 side.

One end of a pressure guiding passage 26 communicates with the pressure chamber 22, and the other end of the pressure guiding passage 26 communicates with a pressure inlet 28 that opens into the intake passage 4 downstream of the intake throttle valve 8. An air-conditioning idle-up control valve (VSV) 30 that is turned on / off to operate the actuator 16 so as to open and close the pressure guiding passage 26 to control the intake pipe pressure to the pressure chamber 22 is provided in the pressure guiding passage 26. Is interposed. As a result, the pressure guiding passage 26 is
-1 and a second pressure guiding passage 26-2.

The air-conditioning idle-up control valve 30 communicates with the control means 32, and is turned on and off to operate the actuator 16 between an idle-up state and a non-idle-up state as shown in FIG. . The control means 32 is also in communication with a compressor clutch 34 which is turned on and off so as to turn on and off an air conditioning compressor (not shown) of the air conditioner.

In the control means 32, as shown in FIG. 2, the idling-up engine speed of the internal combustion engine 2 is set to be higher than an idling engine speed (not shown) by a predetermined amount. An idle-up control point of the engine speed is set to be higher than the engine speed by a predetermined amount. The idle-up control point is a change in the engine speed, which releases / returns the idle-up state of the internal combustion engine 2 in which the air conditioning idle-up control valve 30 is turned on and the intake throttle valve 8 is operated by the actuator 16. It is. That is, the idle-up state of the internal combustion engine 2 refers to a state in which the intake throttle valve 8 is not closed by the actuator 16 below a certain opening.

As shown in FIGS. 2 and 3, when the compressor clutch 34 is turned on and the air conditioner is operating and the engine speed does not reach the idle-up control point as shown in FIGS. The valve 30 is turned on, the operation of the intake throttle valve 8 by the actuator 16 is performed to set the engine speed to the idling-up engine speed, and then the accelerator pedal is depressed so that the engine speed becomes lower than the idling-up engine speed. Begins to rise (indicated by the time Po)
When the idle-up control point is reached from a state lower than the idle-up control point, the air conditioning idle-up control valve 30 is turned off and the intake throttle valve 8 by the actuator 16 is turned off.
, The idle-up state of the internal combustion engine 2 is released (non-idle-up state) (indicated by time P), and the engine speed is higher than the idle-up control point (non-idle-up state). When the control returns to the idle-up control point from the state (i.e., state A), that is, when the idle-up signal is turned on (indicated by time A), the air-conditioning idle-up control valve 30 is turned on and the intake throttle valve 8 by the actuator 16 is turned on. Is performed, the compressor clutch 34 is turned off, the operation of the air conditioner is stopped, and a predetermined time, which is an operation delay time of the actuator 16 from the time when the engine speed returns to the idle-up control point (indicated by time A). After the lapse of time (Td) (indicated by time B), the compressor clutch 34 is turned on to restart the air conditioner.

 Next, the operation of this embodiment will be described.

When the air conditioner is operating, the air conditioning idle up control valve 30
In the idle-up state of the internal combustion engine 2 in which the intake throttle valve 8 is operated by the actuator 16 by turning on the compressor 16, the control means 32 turns on the compressor clutch 34 as shown in FIG. The idle-up control valve 30 is turned on, and the air-conditioning idle-up control valve 30 controls the intake pipe pressure in the pressure guiding passage 26, thereby reducing the intake pipe pressure acting on the pressure chamber 22 of the actuator 16 from the intake passage 4. Under the control, the intake throttle valve 8 is opened to a certain degree to maintain the engine speed at the idling-up engine speed.

When the accelerator pedal starts to be depressed (indicated by time Po), the engine speed increases, and when the engine speed reaches the idle-up control point from a state lower than the idle-up control point (indicated by time P), the air-conditioning idle The control valve for up 30 is turned off, the opening operation of the intake throttle valve 8 by the actuator 16 is stopped, and the idle-up state of the internal combustion engine 2 is released (non-idle-up state).
As a result, the intake throttle valve 8 can be closed below the above-mentioned fixed opening degree, and is normally opened and closed by operating the accelerator pedal, so that fuel efficiency can be improved and engine braking and the like can be made advantageous.

Next, when the idle-up state of the internal combustion engine 2 is released (non-idle-up state), the engine speed decreases from a state higher than the idle-up control point and returns to the idle-up control point (indicated by time A). When the idle-up signal is turned on and the internal combustion engine 2 is returned to the above-mentioned idle-up state, the control means 32 turns on the air-conditioning idle-up control valve 30. However, at this time,
Even if the air-conditioning idle-up control valve 30 is turned on, there is an operation delay time (Td) of the actuator 16, and even if sudden deceleration occurs, the engine speed temporarily changes to the idle-up engine rotation. In this embodiment, the operation delay time of the actuator 16, that is, the engine speed is reduced by the engine speed for idling up. The compressor clutch 34 is turned off for a predetermined time (Td) until the rotation speed is reached, and the operation of the air conditioner is temporarily stopped. After the above-described predetermined time (Td) has elapsed (indicated by time B), the compressor is stopped. The air conditioner is restarted by turning on the power clutch 34.

As a result, when the engine speed at the time of releasing the idle-up state of the internal combustion engine 2 returns from the state higher than the idle-up control point to the idle-up control point, the operation of the air conditioner is stopped for a predetermined time (Tb). Since the engine stops at one point, it is possible to prevent the engine speed from temporarily becoming lower than the engine speed for idling-up, and to maintain the engine speed smoothly at the engine speed for idling-up (second, third). (Indicated by a solid line in the figure), the occurrence of engine stall can be prevented.

Further, in order to eliminate the operation delay of the actuator 16, the actuator 16 may be a solenoid type actuator. However, in this case, a large operating force is required and the cost is disadvantageous. However, according to this embodiment, since the idle-up state can be controlled by the control means 32, a small operating force is required. And it can be inexpensive.

In this embodiment, the above-mentioned idle-up state is released and returned based on the engine speed. However, the above-mentioned idle-up state is released and released based on the vehicle speed.
It is also possible to return.

[Effects of the Invention] As is apparent from the detailed description above, according to the present invention, when the compressor clutch is turned on and the air conditioner is operating and the engine speed is higher than the idle-up control point, the idle-up control is performed. When it returns to the point, the control valve for air conditioning idle-up is turned on, the intake throttle valve is operated by the actuator, the compressor clutch is turned off, the operation of the air conditioner is stopped, and the engine speed is idle-up. The control means for turning on the compressor clutch and restarting the air conditioner after a lapse of a predetermined time which is the operation delay time of the actuator from the time when the control point returns to the control point turns on the control valve for air conditioning idle-up and turns on the actuator. From the release of the idle-up state of the internal combustion engine with the intake throttle valve When returning to the dollar-up state, the operation of the air conditioner is temporarily stopped for the operation delay time of the actuator to prevent the engine speed from temporarily becoming much lower than the engine speed for idle-up, As a result, occurrence of engine stall can be prevented.

[Brief description of the drawings]

1 to 3 show an embodiment of the present invention, FIG. 1 is a schematic diagram of an idle-up control device, and FIGS. 2 and 3 are timing charts for explaining the operation of this embodiment. In the figure, 2 is an internal combustion engine, 4 is an intake passage, 8 is an intake throttle valve, 16 is an actuator, 22 is a pressure chamber, 26 is a pressure guiding passage, 30 is a control valve for air conditioning idle-up, 32 is a control means,
34 is a compressor clutch.

Claims (1)

(57) [Claims] An actuator for opening and closing an intake throttle valve is provided, and a pressure guiding passage communicating between a pressure chamber of the actuator and an intake passage downstream of the intake throttle valve is provided. An air-conditioning idle-up control valve that is turned on and off to control the intake pipe pressure from the passage to the pressure chamber to operate the actuator is provided, and is turned on and off so that the air-conditioning compressor of the air conditioner is turned on and off. A compressor clutch is provided, and the air conditioning idle-up control valve is turned on and the actuator operates the intake throttle valve to release / return the idle-up state of the internal combustion engine. The engine speed is set higher than the engine speed for up, and the compressor clutch is turned on to operate the air conditioner. If the engine speed does not reach the idle-up control point, the air-conditioning idle-up control valve is turned on, the actuator operates the intake throttle valve to bring the internal combustion engine into the idle-up state, When the rotation speed reaches the idle-up control point from a state lower than the idle-up control point, the air conditioning idle-up control valve is turned off, and the internal combustion is performed without performing the operation of the intake throttle valve by the actuator. When the idle-up state of the engine is released and the engine speed returns to the idle-up control point from a state where the engine speed is higher than the idle-up control point, the control valve for air-conditioning idle-up is turned on and the intake by the actuator is performed. Operate the throttle valve to return the internal combustion engine to the idle-up state In the idle-up control device, when the compressor clutch is turned on and the engine speed is returned from the state higher than the idle-up control point to the idle-up control point during the operation of the air conditioner, the air conditioning is performed. The control valve for idle-up is turned on, the operation of the intake throttle valve by the actuator is performed, the clutch for compressor is turned off, and the operation of the air conditioner is stopped, and the engine speed reaches the idle-up control point. An idle-up control device, further comprising control means for turning on the compressor clutch and restarting the air conditioner after a lapse of a predetermined time which is an operation delay time of the actuator from a point in time of returning.