JPS5985431A - Start judging method of electronically controlled internal-combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for determining the start of an electronically controlled internal combustion engine, and particularly to a method for determining the start of an electronically controlled internal combustion engine, which aims to improve fuel efficiency at engine start 11R. It is something.

As is well known, a microphone [] combination coater or the like is used to inject fuel into an internal combustion engine (hereinafter simply referred to as an injector).

An electronically controlled internal combustion engine that adjusts the valve opening time of (13) is used to increase the amount of fuel at the time of starting the engine to ensure a good engine start.

Conventionally, this type of starting method is known as one in which fuel is increased while the starter switch is turned on. It has been found that even if the engine starts well, fuel consumption continues to increase as long as the starter switch is turned on as described above, resulting in an increase in fuel consumption.

The present invention has been made in view of the above points, and an object of the present invention is to improve the starting of an engine and reduce fuel consumption. Therefore, the method for determining the start of an electronically controlled internal combustion engine according to the present invention uses a rotation speed sensor that detects the rotation speed of the internal combustion engine, a starter switch that detects the start of the engine, and detection signals from engine sensors including these various sensors. In an electronically controlled internal combustion engine that has an electronic control circuit that controls the opening and closing of the injection valve, the engine rotates based on the rotational speed signal from the rotational speed sensor while the starter switch detects engine starting. This feature is characterized in that when it is determined that the engine speed has increased by 9 to a predetermined reference speed, the fuel increase process performed at the time of startup is stopped.

This will be explained below with reference to the drawings.

FIG. 1 shows an example of an internal combustion engine system to which the present invention is applied.

In FIG. 1, 1 to 5 do not represent engine sensors. 1
is a rotation sensor, and the rotation sensor 1 includes, for example, a rotation speed sensor 4 that is built in the disk 1 to the reviewer and generates a rotation speed signal in synchronization with the rotation of the crankshaft of the engine.
It includes a cylinder discrimination sensor that detects a crank angle position corresponding to the ignition timing of a reference cylinder among a plurality of cylinders such as a cylinder engine or a six-cylinder engine. Reference numeral 2 denotes a starter switch, and the switch 2 can detect when the starter switch is turned on at 22:00, that is, when the engine is started. Reference numeral 3 denotes a digital sensor group other than the starter switch 2, and the digital sensor group 3 includes, for example, an 02 sensor that detects the residual oxygen temperature in the exhaust system, an air conditioner switch that detects A or Δf of the air conditioner, etc. . Reference numeral 4 denotes a cooling water temperature sensor, and the cooling water temperature sensor 4 is mounted, for example, on a cylinder block, and detects the cooling water temperature of the suspended engine. Reference numeral 5 indicates a group of 4 analog sensors other than the Cold II water drying sensor 4, and the analog sensors 5 include an air intake meter attached to the air supply system that detects intake air flow, and an intake air temperature sensor. Intake Fm L? There are many examples.

6 represents an electronic control circuit. In the control circuit 6,
Reference numeral 7 denotes a microphone 1, a knob-mouthed unit 1 to an MPU, and the MPU 7 responds to various detection signals from the above-mentioned +m sensors 1 to 5 according to an engine control program stored in advance in the ROMB described later. Based on this, the opening time of the injection valve, which will be described later, is calculated. Reference numeral 8 represents a timer that generates a clock signal when performing timer interrupt processing, which will be described later.

8 is a read-only memory, ie, ROM, and the ROM
8 stores engine control programs and the like in advance. 9 is a random access memory or RAM;
Various data are temporarily written to and read from the RAM 9. 10 is a timer and is used to start timer interrupt processing! Generates a cock signal. 11
is an interrupt input port to which the rotation from rotation sensor 1v1) *1σ signal and cylinder discrimination signal are input as interrupt number 4F5, and the interrupter capos 1 to 11 are input to the MPU
An interrupt command signal is output to 7. 12 is a digital input port into which the starter signal from the starter switch 2 and other digital signals from the digital sensor group 3 are input, and 13 is the coolant water shortage signal from the coolant temperature sensor 4 (and other analog sensor group). The analog input port 13 receives analog signals from the MPU 7 and selectively converts these signals into digital signals. , 14 is a counter, the counter 14 is set with number 1it-i data corresponding to the opening time of the injection valve calculated by the M P IJ 7, and is applied to the clock signal from the timer 10. At the same time, the above-mentioned numerical data is sent down from click 1 to click 1.
15 is a power amplification section; 15 is a power amplification section;
performs power amplification processing while the output signal of the counter 14 is at a high level, and the electromagnetic injection valves 16-1 to 16-1
Selectively outputs the amount valve command bind-off for 1. 16-1
16-n represent electromagnetic injection valves installed in one-to-one correspondence with, for example, the n cylinders. Further, CB represents a TIF bus for transferring data between the MPU 7 and its oil control circuit components 8 to 14.

Conventionally, in this type of internal combustion engine system (13), a starting flag is set to "1" while the starter switch 2 is turned on, as shown in FIG. '', the opening time of the injection valves 161-16-n was set to be relatively long (in order to increase the amount of fuel at startup. However, as shown in FIG. , for example, 500, which is an indication that the engine has started well.
Since the starting flag is still set to "1" even after the engine speed increases to the M single rotation speed of rpm, the starting flag continues to increase, and as a result, fuel efficiency inevitably decreases. It has been found.

The purpose of the present invention is to solve the above-mentioned problems, and as shown in FIG. Judging that I have reached the upper limit,
It is characterized by resetting the starting flag to "0" and stopping fuel increase after the reset.

FIG. 4 shows a first embodiment of the invention.

The first embodiment achieves the objective as described above in FIG. 3, and is executed by, for example, 4 m5 ec timer interrupt processing.

In this timer interrupt processing, starter switch 2
Immediately after d3 is turned on, the engine speed is below a predetermined reference speed, for example, 500 ppm, so the determination result at step 100 is FNOJ, and step 101 is then executed. Since the judgment result is immediately after the starter switch 2 is turned on, l-
Then, step 102 is executed and the fetal movement flag, that is, the STA flag is set to "1". Here, the above-mentioned engine speed is calculated in the MPU 7 based on the rotation speed signal from the rotary wheel 1, and the reference rotation speed is set at γ so that the engine R starts sufficiently well. It goes without saying that the starter switch ON determination step 101 is determined based on the start signal from the starter switch 2. In addition, 1if7 operation flag, or STA flag (J is an indicator for determining whether or not to increase the amount at start).Therefore, d3 is set immediately after A of starter switch 2, and d3 is set at start. The increase process is executed,
The valve-opening time of the injection valves 16-1 to 16-n fl is set relatively long.

The rear engine speed increases and the reference speed reaches 500 r, for example.
When the value becomes F after pn+, the determination result of step 100 becomes [
Y, EsJ, and step 103 is newly executed 1tf
The flag is set to [0,1
will be reset to Therefore, the start timing (a) process is then stopped.

If the engine speed becomes equal to or higher than the reference speed while the starter switch 2 is in the on state as described above, the starting flag, that is, the STA flag is reset, and the starting fuel increase process is stopped. Therefore, it is possible to improve fuel efficiency while starting the engine in line 4 favorably.

Thereafter, the starter switch 2 is turned off, and for some reason the rotational speed decreases by 1, and the reference rotational speed, for example, 5.
Until the speed becomes less than 0.00 rpm, the route consisting of the speed converter 100 and the step 103 is always selected. After that, when the engine speed becomes less than the reference speed, the judgment result of step 100 becomes rNOJ and the judgment result of step 101 becomes rNOJ, so step 104 is newly executed and the starting flag, that is, the ST△ flag becomes "1". ” is determined. At this point, since the STA flag is "O", the determination result of step 104 is "NO", and next step 105 is executed anew, and the engine speed is set to It is determined whether or not the reference rotation speed is less than or equal to the reference rotation speed, for example, 1.0 ppm. At this point, the engine speed is still 10
Since it is not below 0 ppm, step 105 is performed.
The determination result is rNOJ, and step 103 is then executed. Therefore, if the engine speed is different from another reference speed, e.g.
Step 10 until it decreases to 0.00 ppm or less.
01 step 101, step 10/l, step 10
5 and step 103 is always selected.

After that, the engine speed changes to another reference speed, for example 10Qpp.
When it becomes less than m, the determination result of step 105 is rYEs.
Then, step 102 is executed again, and the start flag, ie, the STA flag, is set to "1". Therefore, the engine starting fuel increase process is restarted, and the engine speed increases as shown in FIG. 3, and the engine speed does not reach engine speed.

FIG. 5 shows a flowchart representing a second embodiment of the invention.

In this second embodiment, as in the first embodiment, a predetermined timer interrupt process, for example, a 4 m5 ec timer interrupt process is performed.

This second embodiment is different from the first embodiment in that the predetermined reference rotation speed and other reference rotation speeds are 500 rpm and 11 rpm, respectively.
00pp was fixed, but the base rotation speed and other reference rotation speeds were set by changing the cold section water temperature Hinley-4.
J: It can be changed according to the cooling water temperature,
For example, as the cooling water temperature rises, the reference rotation speed and other reference rotation speeds are made to each have a downward trend. The process of setting these reference rotation speeds is performed in step 200.
It will be carried out at Then the other steps 201 to 20
Each step of 6 is the same as each step of the first embodiment 100 to 105.

As explained above, the method for determining the start of an electronically controlled I-type internal combustion engine according to the present invention uses a rotation speed sensor that detects the rotation speed of the internal combustion engine, a starter switch that detects the start of +m, and these various sensors. In an electronically controlled internal combustion IFF IMI that has an electronic control circuit that receives detection signals from engine sensors including engine sensors and controls the opening and closing of the starter valve, the starter switch If it is determined that the engine speed has increased to a predetermined reference speed based on the rotation speed signal from the rotation 3i degree sensor while the engine is running, the fuel inter-ground treatment in step 11 is stopped at the time of startup.

Therefore, according to the present invention, it is possible to improve the fuel efficiency while starting the engine properly.

Furthermore, if the reference rotation speed is changed in accordance with the cooling water temperature, starting control can be performed that more closely matches the quiet operating conditions.

In addition, as described in the first and second embodiments, another reference rotational speed is set as a guideline for the engine speed 1 to 1, and the engine rotational speed is adjusted to the other reference rotational speed. By restarting the background marking process at the time of starting and covering the engine when the number is lower than that, engine stall can be easily prevented.

[Brief explanation of drawings]

FIG. 1 shows an example of an internal combustion engine system to which the present invention is applied.
FIG. 2 is an explanatory diagram for explaining the conventional start-up determination method,
Figure 3 is an explanatory diagram for explaining the present invention, Figure 4 and J:
and FIG. 5 represent the first and second embodiments of the present invention, respectively) [1-Charts]. 1... Rotation sensor including rotation speed sensor V 1) 2... Starter switch 4... Cooling water temperature sensor -6...
Electronic control circuits 16-1 to 16-n...Spout valve agent, patent attorney, established student, 1 person

Claims (1)

[Claims] 1. A rotational speed sensor that detects the rotational speed of an internal combustion engine;
In an electronically controlled internal combustion engine that includes a starter switch that detects the start of the engine and an electronic control circuit that receives detection signals from engine sensors including these various sensors (controls the opening and closing of the J injection valve), the starter switch While detecting the start of the engine, the engine speed changes to a predetermined reference speed based on the rotation speed signal from the rotation speed sensor.
1. A method for determining the start of an electronically controlled internal combustion engine, characterized in that, when it is determined that the fuel amount has increased to 1, a fuel increase process performed at the time of starting is stopped. 2.1- The above-mentioned patent includes a cooling water temperature sensor for detecting the cooling water temperature of the engine in the engine sensor, and the reference rotation speed is changed according to the detected cooling water output at the cooling water temperature level. A method for determining whether to start an electronically controlled internal combustion engine according to claim 1.