JPS6176735A - Idle rotating number control method of engine - Google Patents

Abstract

PURPOSE:To retain idle running characteristic of an engine always to optimum characteristic by learning throttle opening and storing it during performing renewal of an objective idle opening to a proper opening. CONSTITUTION:In an idle rotating number control execution, idle rotating number is judged if it is within a non-sensitive area of an objective idle rotating number by a step SO2. When it is in non-sensitive area, the difference of the objective idle opening of a throttle valve and an actual throttle opening is detected by a step SO3. And the throttle opening difference is judged if it is over a previously set predetermined opening by a step SO4. When over the predetermined opening, the objective idle opening is sequentially corrected by a step SO5 so that the throttle opening difference becomes less than the predetermined opening and stored. Thus, idle running characteristic of the engine is always retained to the optimum characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an engine idle speed control method in which a target idle opening degree of a throttle valve is sequentially corrected by learning and memory during idle speed control after warm-up.

(Prior Art) Conventionally, as described in Japanese Patent Application Laid-open No. 56-132430, in a system for controlling the idle speed of an engine after warming up, the target idle opening degree is set in advance according to the water temperature. Each time it is detected that the idle switch changes from off to on, the actuator drives the throttle lever 17i1 degree to the target opening and then controls the engine speed to the target speed. case,
Effects of Engine Changes over Time Even if the appropriate idle opening changes due to the sugakasa, the target idle opening remains the same as the initial setting. If the engine speed is controlled to 0 standard idle speed, for example, the air-fuel ratio determined by the idle opening may not be appropriate, and the engine will enter a rough idle state. , the first merotsu 1 ~ Lusensa no Tori (
However, even if there is an error in the target idle opening and the target idle opening is inappropriate, idling operation can continue without being corrected.

(Problems to be Solved by the Invention) The present invention learns and stores the sloramir level during the execution of idle speed control after a warm weather and corrects the target idle opening, thereby preventing incorrect installation of the throttle sensor. The goal is to eliminate the effects of changes over time.

(Means for Solving the Problems) As shown in FIG. 1, the present invention controls the throttle valve opening position by driving an actuator based on signals from various sensors corresponding to engine operating conditions. When controlling the idle rotation speed to the target idle rotation speed, it is determined in step S01 whether or not idle rotation speed control is being executed in a state where a specific inter-character spacing condition is satisfied, and when the idle rotation speed control is being executed, it is determined in step SO2 that the engine idle speed is controlled. Step 8: Determine whether the rotation speed is within the dead zone of the target idle rotation speed, and determine whether the rotation speed is within the dead zone.
In step 803, the difference between the target idle opening of the throttle valve, which is determined by the target idle rotation speed J, and the actual throttle valve opening is detected, and in step 804, the throttle valve opening difference is determined to be a predetermined value. It is determined whether or not the throttle opening is greater than or equal to a predetermined opening, and when the throttle opening is greater than or equal to a predetermined opening, the throttle opening difference is determined to be 11a in step 305.
The present invention provides a method for controlling an idle rotation speed of an engine, in which the target idle opening degree is sequentially corrected and stored so as to be equal to or less than a predetermined degree.

(Embodiment) Next, the configuration of an embodiment of the present invention will be described with reference to FIGS. 2 to 5.

A throttle valve 4 is attached to the intake passage 3 that supplies fuel from the carburetor 2 to the engine, and is biased in the valve closing direction by a spring (not shown), which responds to the amount of depression of the accelerator pedal. In the valve closed position, the operation lever 6 fixed to the shaft 5 of the throttle valve 4 is actuated by the actuator (ISO) 7, in this case, reversible operation is possible.
The forward and reverse rotation e 7 is determined by contact with the touch head 12 at the tip of the actuator 7 that moves the output shaft 11, which is fitted with a threaded rod 10 whose circumferential direction movement is regulated and a screw bX, back and forth, and The contact of the opposing operating lever 6 is due to this contact of the spring 13 (J'!A
Final gear 1'714 with output @11 against force
is detected when the idle switch 15 is turned on due to the slight backward movement of the output shaft 11, and the end of the stroke of the output shaft 11 (
It is detected when the dog 16 on the output shaft 11 comes into contact with the lever 18 of the limit switch 17.

This vaporization '52 includes a main cut solenoid valve 22 for cutting off the fuel (It) supply to the main nozzle 20 formed in the small bench lily 19 of the intake passage 3 at the non-jet 21 position, and a throttle valve 4 of the intake passage 3. A slow-cut electromagnetic piece 24 for cutting the fuel supply to the S[''-port 23 formed nearby, and an air bleed controller 1 to a roll valve 25 for adjusting bleed air for the main and slow systems. If stepper morph 2
6, the nut body 27 is rotated in the forward and reverse directions, and the needle valve 29 is moved back and forth together with the threaded stud 28 whose movement in the circumferential direction is regulated.
．． 32 to the main system and slow system fuel passages 33
．． Air bleed control 1-roll valve 25 that adjusts the bleed air mother supplied to 34, and Urasuke fuel pump 35 that increases the amount of fuel supplied to the engine during engine startup and acceleration 14, etc. In this case, the solenoid coil 36 is turned on.・Off operation and spring 37 f'J'
/) Piston 39 via plunger 38 by force
The reciprocating motion of the carburetor 2 causes the flow of fuel from the chamber 'I O to be sucked into the cylinder chamber 42 through the suction side check valve 41, and then from the discharge side check valve 43 to the large venturi 44 formed at a position above. Auxiliary nozzle 4
Auxiliary fuel pump 35 supplies fuel to the intake passage 3 through 5
and each are installed.

The carburetor 2 configured in this manner includes the DC motor 8 of the actuator 7, each switch 15, 17, each fuel cut solenoid valve 22, 24, and the stepper motor 26 of the air bleed control valve 25. , a solenoid coil 36 of the auxiliary fuel pump 35, a throttle opening sensor I'I6 that is attached to the carburetor 2 and generates an output corresponding to the opening of the throttle valve 4, and a throttle opening sensor I'I6 that is attached to the water gauge 1/get of the engine. a water temperature sensor 47, and an engine rotation speed sensor 48 such as an ignition coil.
, a vehicle speed sensor 49 that generates an output corresponding to the speed of the vehicle, and a 02 sensor 50 that is attached to the exhaust passage and generates an output that corresponds to the oxygen concentration, and that changes the output when the clutch is off and in the neutral state. A clutch/neutral detection sensor 51, a side lamp switch 52 that generates an output when the side lamp is on, and an economy/diagnosis lamp 53 that lights up during economy and diagnosis.
, the air conditioner switch 54 , the starter switch 55 , the ignition key switch 56 , and the alternator control circuit 57 are each connected to a so-called ECU in which the power supply from the battery 58 is controlled on and off by the ignition key switch 56 . It is connected to an electric control circuit 59 for engine control.

Next, FIG. 3 shows a specific example of five electric control circuits, in which the microcomputer CPU, which is controlled according to the program in the storage circuit ROM, receives the engine speed from the engine speed sensor 48 via the waveform shaper 60. In addition to inputting a pulse signal of the corresponding frequency, 4 tons of water? Each of the analog signal corresponding to the engine cooling water temperature from the sensor 47, the analog signal corresponding to the opening of the throttle valve 4 from the throttle opening sensor 46, and the analog signal corresponding to the oxygen concentration from the 02 sensor 50 is A. /D converter 61 converts it into a digital signal and inputs it via input port 2, and idle switch 15
On/off signals from the clutch/neutral detection switch 51, air conditioner switch 54, four pulse output vehicle speed sensors, ignition key switch 56, starter switch 55, and side lamp switch 52 are input via the input port 3. , and each drive circuit 6 is connected to the output port 4 of the microcomputer CPU.
The DC motor 8 of the actuator 7, the solenoid coil 36 of the auxiliary fuel pump 35, the main cut electromagnetic valve 22, the slow cut electromagnetic valve 24, and the alternator control circuit 57 are each connected via terminals 5 to 69, as well as an output capacitor. -1-70 is connected to the stepper motor 26 of the air bleed control valve 25 via a drive circuit 71.

Next, the operation 1' of this embodiment will be explained.

The engine control device configured in this way, in this case, especially the engine control of the electronically controlled chokeless carburetor.
In the second position, the target idle opening degree and the target idle rotation speed, which change according to the engine cooling water temperature, are set in the microphone 1 computer CPU, and during the fiddle operation after the end of the rrAUl operation, the engine is set to the throttle valve 4. Idle control is performed so that the target idle rotation is achieved in a state where the target idle opening is set to the target idle opening, and during this idle control, the target idle opening is controlled by learning according to the flowchart of FIG.

That is, in step 101, it is determined whether a learning condition, in this case, a learning condition in which a stable idle opening degree can be obtained with the electric load such as the side lamp switch 52 turned off, is satisfied, and if the learning condition is satisfied, step 102 It is determined whether the target rotation speed in idle rotation speed control is 650 rpm, for example, in the target idle rotation instruction, and if the target rotation speed is 1 m.
11 In the case of the target idle rotation speed, it is determined in step 103 whether or not the target idle rotation speed is within the dead zone of the target idle rotation speed for a predetermined period of time, for example, 5 seconds or more after the start of execution of the idle rotation speed control. The target idle opening initially set in step 104 in a certain stable idle state, for example, 650, which is the target idle rotation speed after warming up.
If the idle opening degree set corresponding to the rpm is 1 degree, as shown in FIG. The difference Δ from Step 10
In Step 6, it is determined whether this difference Δ is + or -, and in Steps 107 and 108, a constant constant ω is adjusted or stopped in response to this upward direction, so that the target idle opening becomes, for example, ε shown in FIG. It is updated by a certain amount and learned and memorized, and when this difference becomes less than a predetermined opening where there is no substantial difference, this learning and memorization is not performed and the power is backed up to the updated optimal target idle opening. The target idle opening degree according to the water temperature is appropriately set as this target idle opening degree Δ''−α (αt is a constant), and this target idle opening degree is set as Δ+β (β is a constant). In addition to appropriately setting the target idle opening according to the opening, the installation of the throttle sensor 4 can reliably prevent rough idling, engine stalling, etc. of r2π due to errors and changes in idle over time.

(Effects of the Invention) The present invention learns and stores the throttle opening degree during execution of idle speed control after warm-up, and changes the target idle opening degree to an appropriate opening degree. This has the effect of eliminating errors and changes over time, thereby making it possible to always maintain the engine's idling characteristics at optimum characteristics.

[Brief explanation of the drawing]

FIG. 1 is a 70-dimensional diagram showing the method of the present invention, FIG. 2 is an explanatory diagram of an embodiment of the present invention, FIG. 3 is an electric circuit diagram thereof, and FIG. 4 is a flow diagram thereof. FIG. 5 is a diagram showing its operating characteristics. SO1~SO5...step

Claims (1)

[Claims] When controlling the engine idle speed to the target idle speed by controlling the throttle valve opening position by driving an actuator based on signals from various sensors corresponding to the engine operating state, the engine is idle when a specific learning condition is met. When the rotation speed is within the dead band of the target idle rotation speed, the difference between the target idle opening degree of the throttle valve determined by the target idle rotation speed and the actual throttle opening degree is detected, and the throttle opening difference is set to a preset predetermined opening degree. 1. A method for controlling an engine idle speed, comprising sequentially correcting and storing the target idle opening so that the throttle opening difference becomes less than or equal to the predetermined opening when the throttle opening is greater than or equal to the predetermined opening.