JP3052676B2 - Method of controlling rotation speed at start of internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a starting speed control method which prevents an abnormal increase in the speed while an internal combustion engine is idling at startup.

[0002]

2. Description of the Related Art In an internal combustion engine to which fuel is supplied through an injector (fuel injection valve), fuel injected into a throttle body adheres to a wall surface in the middle of a transport path to form a liquid film. The liquid film is vaporized and transported to the cylinder side. When the engine is started, it takes time until the formation of the liquid film and the vaporization of the liquid film equilibrate, so that a fuel transport delay occurs, and as shown in FIG. 8A , the air-fuel ratio of the air-fuel mixture supplied to the cylinders Takes time to reach the saturation value.
Therefore, when the engine is started, the air-fuel mixture becomes thin, and the startability of the engine deteriorates.

Therefore, in an internal combustion engine to which fuel is supplied by an injector, as shown in FIG. 8 (B), after the fuel is increased by a predetermined amount at the start of starting, the amount of increase is increased with time. It has been proposed to perform a starting fuel increase control in which the amount of increase is reduced to zero at a time tcon after a certain time has elapsed after the start of the start. When the start-time fuel increase control of FIG. 8B is performed, the amount of increase is set to zero after time tcon, and fuel is supplied to the engine with the injection amount during steady operation. The time tcon in FIG. 8B is usually several tens of seconds.
The time is set to about 5 minutes.

[0004] In this specification, "at the time of starting" means
After the start of the engine, a period until the idling rotational speed (the rotational speed when the opening of the throttle valve is the idling opening) is settled to the target value, or a period in which the start increasing control is performed ( FIG. 8B) 0 to tcon).

[0005]

In the process in which the fuel increase control at the time of starting is performed as described above, a state in which the air-fuel mixture becomes thin may occur in the process of decreasing the increase.
If such a situation occurs, the engine speed may increase and a dangerous situation may occur even if the opening of the throttle valve is the idling opening. In particular, in an internal combustion engine for a vehicle that drives the vehicle via an automatic clutch that is connected when the rotational speed exceeds a set value, if the rotational speed of the engine increases at the time of starting, the clutch is not predicted at all by the driver. When the vehicle is connected, the vehicle may start suddenly, and there is a risk of a personal injury.

Therefore, as disclosed in Japanese Patent Application Laid-Open No. 4-191434, in order to prevent an increase in the idling rotational speed at the time of starting, the rotational speed of the engine is increased during the fuel increase control at the time of starting. At times, a method has been proposed in which the amount of fuel injected is increased in accordance with the rate of increase in the number of revolutions, thereby enriching the air-fuel mixture to suppress the increase in the number of revolutions.

[0007] However, when the method of suppressing the increase in the number of revolutions by increasing the fuel injection amount and enriching the air-fuel mixture in this way increases the amount of fuel used, fuel consumption deteriorates. Inevitable. In addition, when a method of suppressing an increase in the number of revolutions by increasing the amount of supplied fuel is employed, the response of the engine is poor, and the increase in the number of revolutions may not be properly suppressed.

It is an object of the present invention to propose a method of controlling the engine speed at start of an internal combustion engine which can prevent the idle speed from increasing at the start without deteriorating the fuel consumption.

[0009]

SUMMARY OF THE INVENTION The present invention provides a fuel supply system for starting fuel.
The present invention relates to a method for controlling an idling speed at the time of starting the internal combustion engine in which a fuel increase control at the time of starting is performed to increase a supply amount of fuel.
It is wrong .

In the present invention, a state is detected in which the opening of the throttle valve for adjusting the amount of intake air to the internal combustion engine and the engine speed are detected, and the opening of the throttle valve is detected as the idle opening. When an increase in the rotational speed of the internal combustion engine is detected at a predetermined amount, the operation of the ignition device for the internal combustion engine is completely or intermittently stopped to start a rotational speed suppression control that suppresses an increase in the engine rotational speed. When fuel increase control is performed
Only during the period in which

In the above-described method, when an increase in the rotation speed of the internal combustion engine by a predetermined amount is detected in a state where the opening of the throttle valve is detected to be the idle opening, the ignition device for the internal combustion engine is detected. Although the operation is stopped completely or intermittently, a rotation speed suppression control for suppressing an increase in the rotation speed of the internal combustion engine by delaying the ignition position of the internal combustion engine may be performed.

In carrying out the method of the present invention, the opening of the throttle valve may be detected by a sensor which continuously detects the magnitude of the opening of the throttle valve. Alternatively, a switch that takes a different state depending on whether it is in a range exceeding the idle opening degree may be used.

If the engine is set to a state where the engine speed can be controlled during idling even in a steady state after the start of the engine is completed, an abnormal state in which the fuel becomes lean for some reason occurs and the engine speed is reduced. When trying to ascend, the rotation speed suppression control works to stabilize the rotation speed of the engine, so there is a possibility that the operation may be continued without noticing that an abnormal state where the fuel becomes lean has occurred . Continuing to operate the engine while the fuel is lean may damage the engine. In order to prevent such a situation from occurring, when an abnormal state in which the fuel becomes lean at the time of steady state occurs, the idle speed is allowed to increase,
You can make them notice the abnormality. In such a case, a point in time when the idling speed does not normally rise (a point in time when it can be determined that a state in which the formation of the liquid film and the vaporization of fuel from the liquid film are in equilibrium) is reached.
Thus, the execution of the rotation speed suppression control may be prohibited. The appropriate time for prohibiting the rotational speed suppression control differs depending on the type and use of the engine, but some examples are as follows.

(A) The rotation speed suppression control is performed only during the start-time fuel increase control, and the rotation speed suppression control is prohibited after the start-time fuel increase control is completed .
You. (B) The cooling water temperature of the internal combustion engine or the temperature of the internal combustion engine starts.
Up by the set amount for each temperature at the start of operation
After ascending, the rotation speed suppression control is prohibited from being performed. (C) After starting the internal combustion engine, the rotational speed of the internal
The time set when the dollar rotation target value is set to the target value is set.
The rotation speed suppression control is terminated when it is detected that
Let If the engine is misfired at the time of deceleration of the internal combustion engine, the fuel becomes too rich and the responsiveness at the time of re-acceleration becomes poor.

[0015]

As described above, at the start of the engine, when a predetermined increase in the rotational speed of the internal combustion engine is detected while the opening of the throttle valve is detected to be the idle opening, By stopping the operation of the engine ignition system and causing the engine to misfire, or by delaying the ignition timing ,
Perform rotation speed suppression control to suppress the rise in rotation speed of Seki
This allows the engine to start
It is possible to prevent the idle rotation speed from increasing during the operation. In particular, if the engine is misfired when the idling speed is about to rise at the start of the internal combustion engine, the engine immediately reacts and the speed is reduced, so that it is possible to perform control with good responsiveness, It is possible to reliably prevent a sudden increase in the rotation speed at the time of starting.

Further, according to the above method, the increase in the number of revolutions can be suppressed without increasing the amount of supplied fuel, so that a rapid increase in the number of revolutions at the time of starting can be prevented without adversely affecting the fuel consumption. It is possible to reliably prevent a dangerous state in which the automatic clutch is suddenly engaged and the vehicle suddenly starts in the idle rotation state.

Further, as described above, the fuel increase control at start-up
The rotation speed suppression control only during the period when
Causes an abnormal condition where the fuel becomes lean at steady state.
If this occurs, allow the idle speed to rise and
Fuel can be constantly reminded
The engine may be damaged due to continued operation
Can be eliminated. Cooling water temperature of internal combustion engine or internal combustion
Engine temperature set for each temperature at start-up
After the amount has increased, the rotation speed suppression control is performed.
And the internal combustion engine was started
After that, the idle speed of the internal combustion engine has settled to the target value.
After detecting that the motor has continued for the set time,
The same effect can be obtained when control is prohibited.
Fruit can be obtained.

[0018]

In this embodiment, the internal combustion engine is mounted on a vehicle such as a two-wheeled vehicle, and the internal combustion engine is connected via an automatic clutch mechanism and a transmission which are connected when the engine speed exceeds a set value. It is assumed that the output shaft is connected to the axle.

In the method of the present invention, the opening of the throttle valve for adjusting the amount of intake air to the internal combustion engine and the rotational speed of the engine are detected, and it is detected that the opening of the throttle valve is the idle opening. When an increase in the rotational speed of the internal combustion engine is detected to be a predetermined amount in a state where the internal combustion engine is operating, the operation of the ignition device for the internal combustion engine is completely or intermittently stopped, or the ignition position is delayed to reduce the rotational speed of the engine. The rotation speed suppression control for suppressing the rise is performed.

FIG. 1 schematically shows the structure of an apparatus used to carry out the control method of the present invention. In FIG. 1, reference numeral 1 denotes a microcomputer having a CPU, a ROM, a RAM, and the like. The computer 1 detects an output of a signal source 2 for generating a signal including rotation angle information and rotation speed information of the internal combustion engine, outputs of various sensors such as a temperature sensor 3 and an air pressure sensor 4, and a throttle opening. The output of the throttle sensor 5 is input. Signal source 2
Is composed of a signal generator attached to the internal combustion engine, and outputs pulse signals having different polarities at predetermined rotation angle positions of the internal combustion engine, for example, at a maximum advance position and a minimum advance position.

The throttle sensor 5 may be a displacement sensor such as a potentiometer, and may continuously detect a change in the opening of the throttle sensor. The jump position of the throttle valve may be determined by using a plurality of position detection switches. What is detected may be used. Further, the throttle sensor may be constituted by a single switch that takes different states depending on whether the opening of the throttle valve is in the range of the idle opening or in the range other than the idle opening.

The microcomputer 1 receives the output of the signal source 2 and the outputs of the sensors 3 to 5 as inputs, and injects fuel (the position at which fuel injection is started) and injection time (opens the injector valve). Time) and the ignition position of the engine, and an injection command signal Vj and an ignition signal Vi are generated at the calculated injection position and ignition position, respectively.

FIGS. 2 and 3 show an example of an algorithm of a main routine and an interrupt routine executed by the microcomputer 1 to generate an injection command signal and an ignition signal, respectively. Are stored in the ROM. In the main routine, after initializing each unit, interrupts are permitted and outputs of various sensors such as a temperature sensor, an atmospheric pressure sensor, and a throttle sensor are read. Next, using the map for calculating the ignition position, the ignition position at each rotation speed of the engine, which is calculated in the interrupt routine and stored in the RAM, is calculated by interpolation using the interpolation method, and the calculation result is stored in the RAM. The fuel injection position and the injection time are calculated using a map (stored in the ROM) that gives the relationship between the conditions such as the number of revolutions, the throttle opening, the temperature, and the air pressure, and the fuel injection position and the injection time. I do.

Each time the signal source 2 generates a specific signal, for example, a signal indicating the maximum advance position, the interrupt routine of FIG. 2 is executed. In this interrupt routine, the engine speed N is calculated from the difference between the time when the signal source generated the previous signal and the time when the current signal was generated, and the calculation result is stored in the RAM. Next, the time required for the engine to rotate from the current time to the ignition position calculated in the main routine and the time required for the engine to rotate to the injection position are calculated as the ignition position measurement time and the injection position measurement time, respectively. Is set in a timer for measuring the ignition position (called an ignition position timer) and a timer for measuring the injection position (called an injection position timer) to start the measurement operation.

When the ignition position timer has completed the counting operation,
An interrupt routine for generating an ignition signal (not shown) is executed, and an ignition signal Vi is output from an output port of the CPU. When the injection position timer completes the set count measurement operation, an injection command signal generation interrupt routine (not shown) is executed, and a rectangular wave injection command signal Vj having a signal width equal to the calculated injection time. Is CPU
Output from the output port.

The flowcharts shown in FIGS. 2 and 3 show an example of a basic configuration of software required to obtain an ignition signal and an injection command signal using a microcomputer. Various modifications can be considered for the software for obtaining the injection command signal. For example, in the above example, when the signal source generates a specific signal, a routine for starting the measurement of the ignition position and the injection position is executed, and the measurement of the ignition position and the injection position is started at the same reference position. However, the reference positions for starting the measurement of the ignition position and the injection position may be different from each other. In the above example, the calculation of the rotation speed is performed in the interrupt routine, but the calculation of the rotation speed may be performed in the main routine. Further, when the ignition circuit is a current cutoff type circuit, not only a process for generating an ignition signal but also a process for controlling a time during which a primary current flows through an ignition coil is required. Further, in the case of a multi-cylinder internal combustion engine, since a process for determining each cylinder of the engine is required, the software configuration is further complicated, but since the configuration of the software is arbitrary in the present invention, Detailed description is omitted.

The injection command signal Vj is supplied to the injector drive circuit 6. The injector drive circuit 6 supplies a drive current to the drive coil of the injector 7 while the injection command signal Vj having a rectangular waveform is generated. Injector 7
Is supplied with a predetermined pressure (fuel pressure) from a fuel pump, and while the drive current is supplied from the drive circuit 6, the valve is opened to inject the fuel. The amount of fuel supplied to the internal combustion engine depends on the fuel pressure and the injection time (the signal width of the injection command signal Vj).
Is determined by Generally, since the fuel pressure is kept constant by the pressure regulator, the amount of fuel supplied to the internal combustion engine can be adjusted by changing the signal width of the injection command signal Vj.

In order to prevent the mixture from becoming thinner at the start of the internal combustion engine and making it difficult to start the engine, it is necessary to perform a start-up fuel increase control for extending the fuel injection time at the start of the engine. Therefore, a certain period of time after starting (starting)
The injection time is longer until the engine speed reaches the set value after the start of startup, and when a certain time has elapsed since the start of the engine or when the engine speed reaches the set value, the injection time is increased. A map for calculating the injection time is created so as to converge to the value in the steady operation state.

The ignition signal Vi obtained from the microcomputer is applied to the ignition circuit 8 of the ignition device for the internal combustion engine. The ignition circuit 8 generally includes an ignition coil and a primary current control circuit for controlling a primary current of the ignition coil. When the ignition signal Vi is given at the ignition position of the internal combustion engine, the ignition circuit 8 is activated. A sudden change is caused in the secondary current to generate a high voltage for ignition in the secondary coil of the ignition coil. Since the high voltage obtained from the ignition circuit is applied to a spark plug attached to a cylinder of the engine, a spark is generated in the spark plug and the engine is ignited.

In this embodiment, in order to perform an ignition control for suppressing an abnormal increase in the engine speed during idling at the time of starting the engine, at least a three-dimensional system which gives a relationship among a throttle opening, a rotation speed, and an ignition position is provided. The ignition position is calculated using the map. FIG. 4 shows an example of the configuration of the map. In this example, the throttle opening .alpha.
In the idling range smaller than
When the engine speed exceeds the upper limit value N1 of the idling rotational speed, the generation of an ignition signal is prohibited and the engine is misfired. In order to inhibit the generation of the ignition signal, for example, the measurement time for measuring the ignition position is set to “0”, and when the count value “0” is set in the ignition position timer, the timer does not perform the counting operation. It is good to keep it.

Using the map shown in FIG. 4, the operation of the throttle opening α-speed N characteristic when the throttle valve is opened from the idling speed and the vehicle is accelerated in a state where the speed control is performed at the start is performed. It is assumed that the points have changed as shown by A → B → C in FIG. If the throttle valve is then closed and decelerated, the operating point changes as C → D → A because the engine does not immediately decelerate due to inertia, and the operating point passes through the misfire region. If the operating point passes through the misfire region during deceleration, the internal combustion engine does not burn, so the mixture supplied to the cylinder becomes too rich, and if the engine is to be accelerated again from point A, or the engine will be accelerated from point E , A good response cannot be obtained. Therefore, it is preferable not to misfire the engine when the internal combustion engine is decelerated.

As described above, if the engine is set in a state where the engine speed can be controlled during idling even in a steady state after the start of the engine is completed, an abnormal state where the fuel becomes lean for some reason occurs. When the rotation speed is about to increase, the rotation speed suppression control works to stabilize the rotation speed of the engine, so that the operation may be continued without noticing that an abnormal state has occurred. In order to notice that such an abnormal state has occurred, it is necessary to prohibit the execution of the rotation speed suppression control at the time when there is no possibility that the idling rotation speed normally increases. When an abnormal state in which the fuel becomes lean occurs, the idle speed may be allowed to increase. The appropriate time to prohibit the rotational speed suppression control depends on the type and use of the engine, but some examples are given below.

(A) The rotation speed suppression control is performed only during the start-time fuel increase control, and the rotation speed suppression control is prohibited after the start-time fuel increase control is completed. The reason why the idling rotational speed at the start is easy to increase is in the process of decreasing the increase in the fuel increase control at the start. In a state where the increase amount becomes zero (usually several tens seconds to 5 minutes after the start of the start), a state in which the formation of the liquid film and the vaporization thereof are usually in equilibrium (apparently the same amount as the fuel injected from the injector). Since the fuel enters the cylinder), the idling speed hardly increases. Therefore, when the fuel increase control at the start is performed for a sufficient time after the start of the start, the rotation speed suppression control is performed only during the fuel increase control at the start, and the fuel increase control at the start is performed. After the termination, it is preferable to prohibit the execution of the rotation speed suppression control . (B) The cooling water temperature of the internal combustion engine or the temperature of the internal combustion engine starts.
Up by the set amount for each temperature at the start of operation
After it is detected that the motor has risen, rotation speed suppression control is performed.
Prohibited. (C) After starting the internal combustion engine, the rotational speed of the internal
The time set when the dollar rotation target value is set to the target value is set.
The rotation speed suppression control is terminated when it is detected that
Let When the states shown in (b) and (c) above are detected, it can be determined that the formation of the liquid film and the vaporization of fuel from the liquid film are in a state of equilibrium. After the detection, the rotation speed suppression control can be prohibited.

In the example shown in FIG. 4, α <α1 and N>
The engine is misfired at the time of N1. However, if there is a possibility that the throttle opening adjusting screw may be adjusted to increase the throttle opening during idling depending on the user's preference, FIG. As shown, a plurality of set values giving the upper limit of the idling range of the throttle opening may be determined, and the range of the rotational speed at which the engine misfires may be determined for each idling range of the throttle opening. . In the example shown in FIG. 5, three setting values α1, α2 and α3 (α1) are set for the throttle opening in order to give the upper limit of the idling range of the throttle opening α.
<Α2 <α3), and the upper limit values N1, N2 and N3 (N1 <N) of the rotational speed for each idling range.
2 <N3), and when α <α1 and N> N1, α <
The engine is misfired when α> N2 when α2 and when N> N3 when α <α3.

In the above example, the engine is completely misfired when the engine speed exceeds the upper limit while the throttle opening is in the idling range, thereby suppressing the engine speed increase. Alternatively, an increase in the number of revolutions may be suppressed by intermittently stopping the ignition operation and thinning out the ignition spark at a predetermined rate. FIG. 6 shows a configuration example of the ignition position calculation map in this case. In FIG. 6, areas indicated as 1/4, 2/4, and 3/4 respectively indicate that one, two, and three of the four ignition operations are stopped to reduce the number of ignition sparks. Means 0/4 means that all ignition operations are performed normally.

In this example, the throttle opening α is α1 to α
In the idling region in the range of 3, the number of misfires is increased as the amount of increase in the number of revolutions increases, so that the effect of suppressing the increase in the number of revolutions is enhanced.

In the above-described embodiment, the rotation speed suppression control for preventing the increase of the idle rotation speed at the time of starting is performed by the map calculation. However, the opening degree and the rotation speed of the throttle valve are respectively compared with the set values. By making the determination whether or not to be in the state of performing the rotational speed suppression control, when it is determined that the state is to perform the rotational speed suppression control, the engine is misfired, or the ignition position is delayed You may make it. For example, in the interrupt routine of FIG. 3, after calculating the rotational speed N, the rotational speed N is compared with the set rotational speed N1, and the throttle opening α is compared with the set value α1, and α <α1
And when it is detected that N> N1, the ignition position timer may not be set.

In the above-described embodiment, the microcomputer determines whether or not the rotation speed suppression control is to be performed. However, the determination may be performed by a hardware circuit . In the example shown in Figure 1,
The ignition signal and the injection command signal are generated exclusively by the microcomputer, but when the ignition signal and the injection command signal are generated by the microcomputer in this manner, the microcomputer is mounted on the engine without using a battery. When the ignition device and the injector are operated using the magnet generator as a power source, the ignition operation and fuel injection cannot be performed in a state where the voltage of the generator is not established, so that the starting rotation speed of the engine is increased. There's a problem. When the microcomputer fails and does not operate normally, the engine cannot be operated. Therefore, an ignition signal generation circuit and an injection command signal generation circuit composed of hardware circuits are provided separately from the microcomputer, and when the microcomputer is in a state where it does not operate normally, the ignition signal and the injection command In some cases, a signal is supplied. Of course, the present invention can be applied to such a case.

[0039]

As described above, according to the present invention, at the time of starting the engine, the predetermined amount of the rotation speed of the internal combustion engine increases while the opening of the throttle valve is detected to be the idle opening. Is detected, the operation of the ignition device for the internal combustion engine is stopped and the engine is misfired, or the ignition timing is delayed, so that the rotation speed at the time of starting without increasing the fuel supply amount. Rapid rise can be prevented. Therefore, it is possible to prevent a dangerous state in which the automatic clutch is suddenly engaged and the vehicle suddenly starts in the idling state at the time of starting without adversely affecting the fuel efficiency.

In particular, in the invention described in claim 1,
Since the engine is misfired when the idle speed attempts to increase at the start of the internal combustion engine, it is possible to perform control with good responsiveness, and it is possible to reliably prevent the speed from rapidly increasing at the start.

According to the second aspect of the present invention, since the engine speed is reduced by delaying the ignition position of the engine, the abnormal increase in the idle engine speed at the start can be prevented without discharging unburned gas. Can be prevented.

Further, according to the first and second aspects of the present invention,
In other words, the engine speed increase control is
By doing so only during the period , when an abnormal condition occurs in which the fuel becomes lean during steady operation,
Since the rise of the idle speed can be allowed and the occurrence of the abnormal state can be noticed, it is possible to prevent the engine from running and the engine being damaged while the abnormal state occurs.

The invention according to claim 3 or 4
The internal combustion engine cooling water temperature or the internal combustion engine temperature
Is the set amount for each temperature at the start of startup
Prohibits rotation speed suppression control from being performed
In such a case, and according to claim 5 or 6,
As you can see, after starting the internal combustion engine,
The rotation speed has settled to the target value for the set time.
Prohibits rotation speed suppression control from being performed after
Abnormal condition that fuel becomes lean
To prevent the engine from running and damage to the engine with
Can be passed. Further , according to the invention described in claim 7 , it is possible to prevent the fuel from becoming too rich when the vehicle decelerates, so that it is possible to prevent the responsiveness at the time of re-acceleration from deteriorating.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an apparatus for implementing a method of the present invention.

FIG. 2 is a flowchart showing a main routine of a program for realizing an embodiment of the present invention.

FIG. 3 is a flowchart showing an interrupt routine executed each time a signal source generates a signal in the embodiment of the present invention.

FIG. 4 is an explanatory diagram schematically showing a configuration example of an ignition position calculation map used in the embodiment of the present invention.

FIG. 5 is an explanatory diagram schematically showing another configuration example of the ignition position calculation map used in the embodiment of the present invention.

FIG. 6 is an explanatory diagram schematically showing still another configuration example of the ignition position calculation map used in the embodiment of the present invention.

FIG. 7 is an explanatory diagram for explaining a state in which the engine is accelerated and then decelerated in a state where the rotation speed suppression control is being performed in the embodiment of the present invention.

FIG. 8 is a diagram illustrating a start-time fuel increase control.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Microcomputer 2 Signal source 3 Temperature sensor 4 Barometric pressure sensor 5 Throttle sensor 6 Injector drive circuit 7 Injector 8 Ignition circuit

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F02P 5/15

Claims (7)

(57) [Claims] 1. A starting method for increasing a fuel supply amount at the time of starting.
A method for controlling an idle speed at the time of starting the internal combustion engine in which the time fuel increase control is performed , comprising detecting an opening degree of a throttle valve for adjusting an intake air amount to the internal combustion engine and a speed of the engine, In a state where the opening of the throttle valve is detected to be an idle opening, when an increase in the rotation speed of the internal combustion engine by a predetermined amount is detected, the operation of the ignition device for the internal combustion engine is completely or intermittently performed. the rotational speed suppression control is stopped suppress the rotation speed increase of the engine, the starting fuel increase control is
A method for controlling the number of revolutions at the start of an internal combustion engine, wherein the method is performed only during a period in which the operation is performed . 2. A starting method for increasing a fuel supply amount at the time of starting.
A method for controlling an idle speed at the time of starting the internal combustion engine in which the time fuel increase control is performed , comprising detecting an opening degree of a throttle valve for adjusting an intake air amount to the internal combustion engine and a speed of the engine, When it is detected that the opening of the throttle valve is an idle opening and a predetermined amount of increase in the rotation speed of the internal combustion engine is detected, the ignition position of the internal combustion engine is delayed to reduce the rotation speed of the engine. the rotational speed suppression control to suppress an increase, before
A method for controlling the number of revolutions of the internal combustion engine at the time of starting, wherein the method is performed only during the period when the fuel increase control at the time of starting is performed . 3. A starting method for increasing a fuel supply amount at the time of starting.
At the start of the internal combustion engine in which the fuel increase control is performed
A method of controlling the number of revolutions of the throttle valve , wherein the throttle valve adjusts the amount of intake air to the internal combustion engine.
The opening and the engine speed are detected, and the opening of the throttle valve is an idle opening.
A predetermined amount of rotation of the internal combustion engine in a state where
The ignition of the internal combustion engine
Stop completely or intermittently to increase engine speed
Control to reduce the number of revolutions and start the internal combustion engine cooling water temperature or internal combustion engine temperature
Increased by the set amount for each temperature at the time
After that, it is necessary to prohibit the rotation speed suppression control from being performed.
A method for controlling the number of revolutions of an internal combustion engine at startup. 4. A starting method for increasing a fuel supply amount at the time of starting.
At the start of the internal combustion engine in which the fuel increase control is performed
A method of controlling the number of revolutions of the throttle valve , wherein the throttle valve adjusts the amount of intake air to the internal combustion engine.
The opening and the engine speed are detected, and the opening of the throttle valve is an idle opening.
A predetermined amount of rotation of the internal combustion engine in a state where
Retards the ignition position of the internal combustion engine when a rise in
Control to suppress the increase in engine speed.
The internal combustion engine cooling water temperature or internal combustion engine temperature
Increased by the set amount for each temperature at the time
After that, it is necessary to prohibit the rotation speed suppression control from being performed.
A method for controlling the number of revolutions of an internal combustion engine at startup. 5. A starting method for increasing a fuel supply amount at the time of starting.
At the start of the internal combustion engine in which the fuel increase control is performed
A method of controlling the number of revolutions of the throttle valve , wherein the throttle valve adjusts the amount of intake air to the internal combustion engine.
The opening and the engine speed are detected, and the opening of the throttle valve is an idle opening.
A predetermined amount of rotation of the internal combustion engine in a state where
The ignition of the internal combustion engine
Stop completely or intermittently to increase engine speed
After performing the rotation speed suppression control to suppress the engine speed and starting the internal combustion engine,
It is detected that the set value has continued for the set time.
After that, prohibit the rotation speed suppression control from being performed.
A method for controlling the number of revolutions of an internal combustion engine at the time of starting. 6. A starting method for increasing a fuel supply amount at the time of starting.
At the start of the internal combustion engine in which the fuel increase control is performed
A method of controlling the number of revolutions of the throttle valve , wherein the throttle valve adjusts the amount of intake air to the internal combustion engine.
The opening and the engine speed are detected, and the opening of the throttle valve is an idle opening.
A predetermined amount of rotation of the internal combustion engine in a state where
Retards the ignition position of the internal combustion engine when a rise in
Control to suppress the increase in engine speed.
There, after starting the internal combustion engine, the idle speed of the internal combustion engine eye
It is detected that the set value has continued for the set time.
After that, prohibit the rotation speed suppression control from being performed.
A method for controlling the number of revolutions of an internal combustion engine at the time of starting. 7. The system according to claim 1, wherein the rotational speed is suppressed during deceleration of the internal combustion engine.
Claims 1, 2, 3, 4, and 4 are prohibited.
7. The starting rotation speed of the internal combustion engine according to any one of 5 and 6
Control method.