JPS6011644A - Idle-up device in internal-combustion engine - Google Patents

Abstract

PURPOSE:To simplify the adjustment of attaching of an externally loading device, by actuating a fuel control member in the fuel increasing direction with the use of an electronic control device by an amount corresponding to the external load which is given by, for example, an air-conditioning device that operates even upon idling operation. CONSTITUTION:In order to control the amount of air which is introduced into the cylinders of an engine 45 from an air purifier 41 through an intake-air pipe 44, there is provided a throttle valve 43 having a valve shaft 21, the opening degree of the throttle valve 43 being controlled by a step motor 6 which is driven in association with the depressed amount, etc. of an accelerator pedal 60. In this case, there are provided a means A for setting a basic control value in acordance with the depressed amount of the accelerator pedal 60, a means B for determining the external load conditions of an air-conditioning device, a power steering device and an electrical power generator, etc. which are used even upon idling operation and a step compensating means C for adding a predetermined correcting value to the basic control value in accordance with the result of the determination. With this arrangement the step number of the step motor 6 is controlled to regulate the opening degree of the throttole valve 43.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an idle up device for an internal combustion engine.

2. Description of the Related Art Conventionally, an automatic transmission has been proposed that takes advantage of the fuel efficiency of a manual gear transmission and automatically performs this gear change operation together with the operation of a clutch mechanism.

In vehicles equipped with this type of automatic transmission, the engine's fuel control member is separated from the accelerator pedal, and during normal driving, the amount of fuel supplied is adjusted by operating the accelerator pedal in response to changes in load. During gear shifting, in order to smoothly disconnect and connect the clutch mechanism, the electronic control unit operates the fuel control member via an actuator such as a step motor, regardless of the operation of the accelerator pedal. .

However, in such engines where the fuel control member is separated from the accelerator pedal, the idle speed is determined primarily by the setting signal of the electronic control device, so for example, the air conditioner or power steering system that is also used for idle speed is In the case of a vehicle equipped with a control device, it becomes difficult to maintain idle rotation in response to these external ports. For this reason,
Conventionally, an N11 actuator or a fluid pressure actuator that regulates the return position or idle position of the fuel control member is placed in the movement path of the fuel control member, thereby causing the fuel control member to adjust the fuel flow in response to the load at idle rotation. I am trying to operate it in the direction of increase.

However, when installing an air conditioning system into a vehicle later, installing electromagnetic actuators etc. with f-bars is often difficult because there is not enough installation space in the engine room.
There is a problem in that it takes a lot of time for piping etc.

The present invention was made in view of these problems, and is intended for use in internal combustion engines in which an actuator such as a step motor that operates a fuel control member is controlled by an electronic control device that receives input signals such as the amount of depression of an accelerator pedal. In response to external loads such as those from air conditioners, the electronic six-control device operates the fuel control member in the direction of fuel increase by the amount of external load.It is easy to adjust by attaching an external rectangular tube device. The object of the present invention is to obtain an economical idle-up device for an internal combustion engine.

Therefore, in the configuration of the present invention, an actuator such as a step motor is connected to the fuel control member, and the actuator is controlled by an output signal of an electronic control device that receives a signal related to whether or not the accelerator pedal is depressed. In a fuel control system for an internal combustion engine, the electronic Il is used to transmit a valve signal for operating the air conditioning system, power steering system, etc.
In addition to the i11wJ device, the actuator moves the idle position of the fuel control member by a predetermined maximum amount in the fuel increasing direction.

FIG. 1 is an overall configuration diagram for clearly demonstrating the present invention in the case of an ignition engine. In order to control the amount of air sucked into the cylinders of the engine 45 from the air purifier 41 via the intake pipe 44, a throttle valve 43 is provided with the valve shaft 21, and the opening degree of the throttle valve 43 changes depending on when the accelerator pedal 60 is depressed, etc. It is controlled by an associated driven stepper motor 6. An operating lever 23 is fixedly supported on the valve shaft 21, and an idle adjustment spring 15
Normally, the throttle valve 43 is biased to the idle position.

A drive lever 22 is freely rotatably supported on the valve shaft 21.
An adjustment bolt 14 screwed and supported thereon is abutted against the back surface of the operating lever 23. The drive lever 22 is connected to one end of the link 9 with the pin 10, and the (l!! end is connected to the arm 7 of the stepper motor 6 with the pin 8).

In order to detect the idle position and the maximum fuel position or fully open position of the throttle valve 43, a switch is arranged in the movement path of the actuating lever 23, which activates the contact S+, 82. The contact S1 closes the circuit when the throttle valve 43 is in the idle position, and opens when the opening degree increases from the idle position.

The contact S2 is normally open and closes when the throttle valve 43 reaches the fully open position.

A basic charge ii setting means for setting a basic control value according to the degree of depression of the accelerator pedal 60, and a load for determining the external load state of an air conditioning system, a power steering system, a power generating system a, etc., which are also used during idling. Step signal correction means adds a predetermined correction value to the basic control value based on the determination result of the state determination means, the number of steps, that is, the rotation angle of the step motor 6 is controlled, and the opening degree of the throttle valve 43 is adjusted. Ru.

Next, the present invention will be explained based on examples. As shown in Fig. 5-2, the carburetor 2 is equipped with a primary air passage 4 and a secondary air passage 3 extending in the vertical direction, and an air purifier is connected to the upper end surface, while an air intake is connected to the lower end surface. Connected to the manifold.

An operating lever 2 fixedly supported on a valve shaft 21 that supports a throttle valve.
3 is abutted against two stoppers by an idle adjustment spring 15, while a bolt 14 is screwed and supported by a projecting piece 22a of a drive lever 22 rotatably supported on a valve shaft 21. It abuts against the protruding piece 23a.

The drive lever 22 and the arm 7 of the step motor 6 are connected by a link 9.

Further, a cam 20 is integrally formed on the drive lever 22,
A bell crank 18 having a roller 19 engaged therewith is rotatably supported on the wall of the carburetor 2 with a support shaft 17. One end of the bell crank 18 is the contact point S+, S
It is arranged opposite to the microswitch 16 which has a contact 16a in place of 2. When the throttle valve is in the idle position, the roller 19 engages with the recess 20a of the cam 20, closing the contact 16a8 of the switch 16. At the intermediate opening of the throttle valve, the contact 16a is closed, and the throttle valve is in the fully open position. The roller 19 then engages the recess 20b and closes the contact 16a again.

The step motor 6 is controlled by an electronic III control device 50 consisting of a microcomputer. I will be treated. The microcomputer includes a microprocessor 52 and a memory 53
and an interface 51.

A signal from an accelerator sensor 61 that detects the amount of depression of an accelerator pedal 60 as a change in resistance value is input to the interface 51 as a digital signal by an AD converter 62 . Further, an ON/OFF signal of a switch 16 for detecting the idle position and full position of the throttle valve is input. Furthermore, a switch 55 that detects the operating state of the air conditioner;
A pressure switch that is activated when the hydraulic pressure of the hydraulic pressure circuit of the power steering device exceeds a predetermined value or a switch 56 that is activated when the steering angle of the steering wheel exceeds a predetermined value is turned on.
・OFF signal is input.

Control values corresponding to the amount of depression of the accelerator pedal 60 are stored in advance in the ROM of the memory 53 as a control map, and the control map is looked up in accordance with the signal from the accelerator sensor 61 to read out the corresponding basic output value. It will be done.

In the present invention, the above-mentioned basic output value is corrected according to the operation/stop of the air conditioner and the load state (steering state) of the power steering device, and is set to a different value depending on each case, and the step motor 6 Adjust the number of steps added to This correction value is complicated depending on each operating condition, but for convenience of explanation, the correction value of the basic output value is shown in the following table, representing several types of values.

Air conditioner Power steering device Correction value stop Light load O Large load 4 Operation Light load 9 Large load 13 As shown in the table above, when the air conditioner is stopped and the load on the power steering device is small (straight running) In other cases, the correction value is set to 0, and in other cases, a different value is set to satisfy the output at or immediately after idle rotation.

FIG. 3 shows a flowchart of the above-mentioned control program.

In the same figure (in X, p11 to p30 indicate each step of the flowchart. The control program of the present invention is repeatedly calculated at fixed time intervals. Following the basic rotation speed setting, the calculation part is p11 to p30.
ll, the signal from the accelerator sensor 61 is input in p12, and a control map corresponding to the amount of depression of the accelerator pedal is looked up and stored in register A in p13.

Next, in p14, it is determined whether or not the air conditioner is in operation, and if it is in the stopped state, it is determined in p15 whether or not the load on the power steering device is large. If the air conditioner is in a stopped state and the load on the power steering device is small, the basic value is left as is in 916, and when the air conditioner is in a stopped state and the load on the power steering device is large, is p1
In step 7, the correction value 4 is added to the basic output value.

When the air conditioner is in operation, it is determined in p18 whether the load on the power steering device is large or not, and if the load on the power steering device is small, it is corrected to the basic output value in p19. A value of 9 is added, and if the load on the power steering device is large, a correction value of 13 is added to the basic output value at p20. The above result is transferred to the output register at p21, and the process moves to the next control program at D22.

According to the present invention, it is possible to maintain the opening degree of the throttle valve of the carburetor at an appropriate value during idle rotation in accordance with changes in the external load of the engine, so that the engine stalls due to a sudden increase in the external load during idle rotation. In addition, it is possible to eliminate problems such as idling, and to achieve smooth engine operation from idling to sudden acceleration or from idling to idling in response to changes in running conditions.

Further, according to the present invention, since the accelerator pedal and the throttle valve are not mechanically connected, the present invention can be provided at a low cost by simply setting a signal to the memory of a microcomputer that controls the step motor 6. It eliminates the need for time-consuming assembly and adjustment unlike actuators, has a very simple configuration, and has fewer mechanically worn parts, greatly improving reliability and durability. can.

In the above-mentioned embodiment, the case of the ignition m jump was explained, but the same effect can be obtained also in the case of a diesel engine if the control lever of the fuel injection pump is operated by a step motor.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram for clearly explaining the present invention, FIG. 2 is a block diagram for explaining the present invention in detail, and FIG. 3 is a flowchart for explaining software for controlling a step motor. 2 Two carburetors 6: Step motor 22 Two drive levers
23: Operating lever 43: Throttle valve 44: Intake pipe 50
:Electronic control device 55:Air conditioner switch
56-Pressure switch of the hydraulic circuit of the power steering device 60:
Accelerator pedal patent applicant Isuzu Motors Co., Ltd. 11-

Claims (1)

[Claims] In a fuel control device for an internal combustion engine, an actuator such as a step motor is connected to a fuel control member, and the actuator is controlled by an output signal of an electronic control device that inputs a signal related to the amount of depression of an accelerator pedal. A load signal related to the operation of a harmonizing device, a power steering device, etc. is applied to the electronic control device, and the idle position of the fuel control member is moved by a predetermined amount in the fuel increasing direction by the actuator. An idle up device for internal combustion engines.