KR940006049B1 - Idle rotating speed control device for internal combustion engine - Google Patents

Abstract

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Description

Idle speed control device of internal combustion engine

1 and 2 show an embodiment of the present invention, and FIG. 1 is a block diagram of an idle speed control device.

2 (a), 2 (b), 2 (c), 2 (d), and 2 (e) are timing charts of the idle rotation speed control device.

* Explanation of symbols for main parts of the drawings

2: internal combustion engine 4: idle rotation speed control device

6: air conditioner 8: controller

10: speed sensor 12: ignition coil

14: idle up negative pressure switching valve 16: air conditioning compressor

18: timer

[Industrial use]

The present invention relates to an idle speed control device of an internal combustion engine, and more particularly, to an idle speed control device of an internal combustion engine that can improve startability of the internal combustion engine.

[Prior art]

An idle rotation speed control device for an internal combustion engine that compensates the variation in idle rotation speed due to load variation during idle operation of an internal combustion engine and controls the engine rotation speed to a target idle rotation speed is disclosed in Japanese Patent Laid-Open No. 62-121842. There is. The idle rotation speed control device disclosed in this publication prevents a decrease in the engine speed by delaying a predetermined time from the load switch ON when the load switch such as an air conditioner is turned on at the start of the internal combustion engine. It is intended.

Moreover, there exist some which were disclosed by Unexamined-Japanese-Patent No. 1-167430 as an idle apparatus which idles an engine speed by an idle mechanism when the load of an electric load or an auxiliary machine joins in the idle operation of an internal combustion engine. The idle-up device disclosed in this publication is provided with a feed switch for feeding power to an electric load, an idle-up mechanism operated by the feed switch, and delays feeding of the electric load for a predetermined time when the feed switch is turned on. This is to prevent the engine speed from dropping.

[Problem to Solve Invention]

Therefore, during start-up of the internal combustion engine, especially when the internal combustion engine is operated at high load and high rotation, and after starting, the engine is warmed up before cooling and stopped. Because of the high, it is not good that the over-concentration of the air-fuel ratio, resulting in deterioration of startability. In addition, as an auxiliary device at the start of such an internal combustion engine in the warming state, for example, if the air conditioner is in operation, the load due to the operation of the air conditioning compressor is large. In some cases, the engine may be stopped and the engine may be stopped.

Therefore, when the internal combustion engine is started, the engine speed is increased by the idle mechanism, for example, the intake throttle valve is opened by the idle mechanism to open the idle position by the idle mechanism, or bypassed. A start control device has been proposed in which a bypass valve of a bypass passage bypassing an intake throttle valve by an air type idle up mechanism opens and idles up to optimize air-fuel ratio and improve startability. Further, as disclosed in Japanese Patent Laid-Open No. 62-121842 or Japanese Patent Laid-Open No. 1-167430, there is a method of preventing the lowering of the engine speed by delaying the operation of the load.

However, the installation of a dedicated idle-up mechanism at the time of starting, such as the starting control device, is not suitable, which leads to a complicated structure and an increase in production cost, and as described in Japanese Patent Laid-Open No. 62-121842. Even if the operation of the load is delayed than the 0N of the switch, since the operation of the load and the operation of the idle mechanism are simultaneous, the engine speed can not be idled by the operation of the idle mechanism before the load is operated. In addition, there is a case where the return of harmonics is not appropriate and the delay of the intake throttle valve by the actuator-type idle-up mechanism causes a time delay in increasing the amount of intake air. It may not be appropriate that a fall cannot be prevented.

In addition, as disclosed in Japanese Unexamined Patent Publication No. 1-167430, since the start time of the load is controlled by time even if the load operation is delayed for the idle mechanism, the internal combustion engine is applied to improve the startability of the internal combustion engine. The load may not be engaged in the proper operating condition of the engine, for example, the engine speed may not increase sufficiently due to lack of time, and the load may be involved in the low operating state, resulting in incongruity of the engine. Inadequately, even when the engine is operated at a high rotational speed, the load does not become involved and causes an unfavorable blow-up of the internal combustion engine.

[Objective of the invention]

Accordingly, an object of the present invention is to realize an idle rotational speed control device of an internal combustion engine that can improve the startability of the internal combustion engine, achieve early harmonization of the engine, and avoid incompatibilities or blowup of the engine. have.

[Means to solve the problem]

In order to achieve this object, the present invention is to provide a rotation speed sensor for detecting the engine speed of the internal combustion engine, to install an ignition coil for supplying power to the ignition plug of the internal combustion engine, the air conditioning driven by the internal combustion engine Air conditioning device having an air compressor having an air compressor, and having an actuator for idle-up the internal combustion engine when the air conditioner is turned on, and having an idle up negative pressure conversion valve for applying an intake negative pressure to the actuator to idle up. An up mechanism is provided, and the idle unit negative pressure conversion valve is turned on by turning on the air conditioner at the start of the internal combustion engine by the rotation speed signal input from the rotation speed sensor and the ignition signal input to the ignition coil. And the intake negative pressure is applied to the actuator by turning on the idle up negative pressure conversion valve. The air conditioning apparatus is operated by operating a quiet idle mechanism and controlling the internal combustion engine to idle up, and after the predetermined time has elapsed by the time calculation of a built-in timer since the engine speed of the internal combustion engine is set to be higher than a predetermined rotation speed. It characterized in that the control means for controlling to operate the air conditioning compressor of the.

[Action]

According to the configuration of the present invention, the control means controls the air conditioning apparatus to be turned on at the start of the internal combustion engine to operate the air conditioning idle-up mechanism of the air conditioning apparatus, and the rotation speed of the internal combustion engine is a predetermined number of revolutions. After the predetermined time has elapsed, the air conditioning compressor of the air conditioning apparatus is operated so that the air conditioning can be idled using the air conditioning idle-up mechanism at the start of the internal combustion engine, and the operation timing of the air conditioning compressor is started. It can be properly controlled by the engine speed and time, so that the load of the air conditioning compressor can be loaded in the proper operating state of the internal combustion engine.

EXAMPLE

EMBODIMENT OF THE INVENTION Hereinafter, the Example of this invention is described in detail and concretely based on drawing.

1 and 2 show an embodiment of the present invention.

In FIG. 1, 2 is an internal combustion engine, 4 is an idling speed control apparatus, 6 is an air conditioning apparatus.

This idle rotation speed control apparatus 4 has provided the controller 8 as a control means. This controller 8 also functions as a controller of the air conditioning apparatus 6. The controller 8 receives the rotational speed signal from the rotational speed sensor 10 of the internal combustion engine 2 and the ignition signal from the ignition coil 12 of the internal combustion engine 2.

The controller 8 inputs the rotational speed signal and the ignition signal, and controls the operation of the idle-up negative pressure conversion valve 14 and the air conditioning compressor 16 constituting the air-conditioning idle-up mechanism of the air conditioning apparatus 6. do. That is, the controller 8 inputs the rotational speed signal and the ignition signal, turns on the idle-up negative pressure conversion valve 14 by turning on the air conditioner 6 at the start of the internal combustion engine 2, and activates an actuator (not shown). ) And the air-conditioning idle-up mechanism is operated to actuate the intake negative pressure, and a predetermined time (t) has elapsed after the engine speed Ne of the internal combustion engine 2 becomes equal to or more than the predetermined speed Na. After that, the air conditioning compressor of the air conditioner 6 is controlled to operate.

Next, the operation will be described with reference to FIG.

At the start of the internal combustion engine 2, the controller 8 of the idle rotation speed control device 4 inputs the rotation speed signal from the rotation speed sensor 10 and the ignition signal from the ignition coil 12. The controller 8 sets the starting condition of the internal combustion engine 2 when the engine speed Ne is smaller than the engine stop confirmation recess rotation speed Nr by the rotation speed signal and the ignition signal. When the engine speed Ne is smaller than the engine stop confirmation reset speed Nr, when the internal combustion engine 2 of (Ne <Nr) is started, the air conditioner 6 is turned ON and the idle-up negative pressure conversion valve By turning on (14), the intake negative pressure is applied to the actuator (not shown) to control the air-conditioning idle-up mechanism. In other words, when the internal combustion engine 2 is started, the idle-up negative pressure conversion valve is turned ON. When the internal combustion engine 2 is fully wide and starts to operate, the intake negative pressure generated acts and the actuator is operated until the full stroke. Open the intake throttle valve from the idle opening to the idle up opening. When the engine speed Ne of the internal combustion engine 2 which started operation by the full width rises and becomes more than predetermined | prescribed rotation speed Na (Ne> Na), the timer 18 built in the controller 8 will Run to start counting.

If the engine speed Ne of the internal combustion engine 2 rises further from the predetermined speed Na during the time-of-time counting by the timer 18, and the predetermined time t by the time-of-time of the timer 18 has elapsed. The air conditioner compressor 16 is controlled to operate. As a result, the engine speed Ne falls to the engine speed Ne when the normal air conditioner 6 is in the ON state by the operation of the air conditioning compressor 16.

In this way, the controller 8 turns on the air-conditioning apparatus 6 at the start of the internal combustion engine 2, turns on the idle-up negative pressure conversion valve 14, and applies intake negative pressure to an actuator (not shown). By controlling to operate the air-conditioning idle-up mechanism, the air-up idle mechanism can be idled at the start of the internal combustion engine 2. For this reason, since the idle up can be performed without the need for a dedicated idle up mechanism at the start of the internal combustion engine 2, cost reduction can be achieved. In particular, the air-fuel ratio at the start of the internal combustion engine 2 in the warming state of the internal combustion engine 2 can be achieved. By improving the efficiency of the engine, it is possible to improve the startability and to eliminate the adverse effects such as foaming (bubble formation) of the fuel flowing into the carburetor (not shown) by sufficiently increasing the engine speed. Early harmonic return can be achieved.

In addition, after the predetermined time (t) has elapsed since the engine speed Ne of the internal combustion engine 2 became more than the predetermined speed Na by the controller 8, the air conditioning compressor of the air conditioner 6 16) by operating the air conditioning compressor 16 can be properly controlled by the rotational speed and time of the engine, so that the air conditioning compressor 16 in the proper operating state of the internal combustion engine 2 It can be operated to engage the load.

For this reason, the load of the air-conditioning compressor 16 can be engaged in the proper operation state of the internal combustion engine 2, and the load of the load in the inadequate operation state of the internal combustion engine 2 can be reduced. Disharmony and blow-up can be avoided.

In addition, it is not necessary to add or modify parts or the like, and it is possible to cope only by changing the software of the controller 8 of the air conditioner 6 that is already installed, and it is advantageous in practical use.

In this embodiment, the actuator-type idle-up mechanism is illustrated as an idle-up mechanism, and the intake throttle valve is opened for idle-up, but the idle-up valve is opened and closed. It can also be set as the idle air mechanism of a bypass air system to make up.

In addition, the idle up by the idle up mechanism can always idle up at the start of the internal combustion engine 2, and input the cooling water temperature, etc. of the internal combustion engine 2 into the controller 8, and determine the temperature as an internal combustion engine 2 as a determining factor. It is also possible to determine the cooling state and the warming state of the c) and to idle up only during start-up in the warming state of the internal combustion engine 2 to achieve the improvement of the startability of the warming state.

[Effects of the Invention]

The present invention can exhibit the following effects by the above-described configuration.

According to the present application, by using the air-conditioning idle-up mechanism at the start of the internal combustion engine, it is possible to increase the amount of intake air by idling up at the start without requiring the dedicated idle-up mechanism at the start.

As a result, the invention of the present invention is capable of lightly optimizing an excessively high air-fuel ratio at the time of starting the internal combustion engine in a warming state, improving startability and achieving early harmonic return.

Moreover, this invention loads by the operation of the air conditioning compressor to the internal combustion engine which is in an appropriate operating state by operating the air conditioning compressor since the internal combustion engine after starting by the engine rotation speed and predetermined time becomes an appropriate operation state. It is possible to apply the engine, and to prevent engine mismatch or blow-up without the load being applied by the operation of the air conditioning compressor to the internal combustion engine in an improper operation state immediately after starting.

Claims (1)

A rotation speed sensor 10 for detecting the engine speed of the internal combustion engine 2 is provided, an ignition coil 12 for supplying power to the ignition plug of the internal combustion engine 2 is provided, and the internal combustion engine 2 Is provided with an air conditioner having an air conditioner compressor 16 driven by the air conditioner, and has an actuator for idling the internal combustion engine when the air conditioner 6 is turned on, and at the same time, an intake negative pressure is applied to the actuator. An air-conditioning idle-up mechanism having an up-up negative pressure conversion valve 14 for up-operation is provided, and the ignition signal input to the ignition coil 12 and the ignition signal input to the ignition coil 12 At the start of the internal combustion engine 2, the air-conditioning device 6 is turned ON, the idle-up negative pressure conversion valve 14 is turned on, and the idling-up negative pressure conversion valve 14 is turned on to intake the actuator. The negative pressure is applied to the A timer built-in by operating the idle idle mechanism to control the internal combustion engine 2 to idle up and at the same time the engine speed Ne of the internal combustion engine 2 is greater than or equal to the predetermined speed Na. A control means (controller) 8 is provided for controlling the air conditioning compressor 16 of the air conditioning apparatus 6 to operate after the predetermined time t has elapsed by the time calculation in (18). Idle rotation speed control device 4 of the internal combustion engine 2.