JP2917056B2 - Start speed control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a start-up speed control device, and more particularly to a start-up speed control system for an improper air-fuel ratio when starting immediately after starting an internal combustion engine. The present invention relates to a start-up speed control device that can be eliminated.

[Conventional technology]

Some internal combustion engines mounted on vehicles have a clutch mechanism that engages when the engine speed exceeds the combined engine speed. Further, in such an apparatus for injecting fuel into the internal combustion engine, the fuel supply is corrected by correcting the fuel amount within a predetermined time from the start by the start-time fuel injection control with respect to the basic fuel injection control when the internal combustion engine is started. Some are provided with a start-up speed control device for controlling the rotation speed.

An example of such a start-up speed control device is disclosed in
There is one disclosed in -30940 publication. The disclosure in this publication discloses that when the internal combustion engine is started, when the fuel amount is increased by a fuel increase value determined according to the cooling water temperature and injected and supplied, when the engine speed is increased at the start of the internal combustion engine, The fuel increase value is gradually decreased and corrected according to the engine speed, and fuel is injected and supplied. When the engine speed decreases at the start of the internal combustion engine, the fuel increase value is prohibited and the fuel is injected and supplied. In this way, the fuel can be properly injected and supplied.

[Problems to be solved by the invention]

By the way, when the internal combustion engine is controlled to correct and inject fuel by a predetermined amount of time from the start by the start-time fuel injection control by the start-time fuel injection control by the start-time rotational speed control device. In addition, even when the throttle valve is at the idling opening, the engine speed may increase suddenly due to the idle air-fuel ratio or the like.

In such a case, in an internal combustion engine mounted on a vehicle as described above and having a clutch mechanism that engages when the engine speed exceeds the combined engine speed, the rising engine speed must exceed the combined engine speed. As a result, a problem may occur in which the clutch mechanism is coupled and the driving force of the internal combustion engine is transmitted to the traveling mechanism of the vehicle. Further, in the internal combustion engine mounted on the vehicle and having the clutch mechanism as described above, when the driver adjusts the idle adjustment screw of the internal combustion engine to increase the idle speed, the engine is started when the internal combustion engine is started. When the rotational speed increases and exceeds the coupled engine rotational speed, a problem may occur in which the clutch mechanism is coupled and the driving force of the internal combustion engine is transmitted to the traveling engine.

Therefore, when the fuel amount is corrected and supplied by the fuel injection control at the start, the fuel amount is gradually corrected by the rotation speed correction of the fuel injection control at the start according to the rising state of the engine speed to the combined engine speed. It is conceivable that the air-fuel ratio is excessively concentrated to reduce the engine output and the engine speed is decreased to prevent the coupling of the clutch mechanism by controlling the injection supply after increasing the correction.

However, when the internal combustion engine is controlled so that the fuel amount is gradually increased by the rotation speed correction and the fuel is supplied when the internal combustion engine is started, the cancellation of the rotation speed correction is managed by time correction. Therefore, the control of the gradual increase in the fuel amount by the rotation speed correction is continued until the set time set by the time correction elapses.

For this reason, if the vehicle is going to start immediately after the start of the internal combustion engine, the correction of the gradual increase in the fuel amount by the rotation speed correction until the set time set by the time correction of the fuel injection control at the time of startup elapses. In the rotational speed range, an excessively enriched air-fuel ratio causes an improper air-fuel ratio, the engine output is reduced, the engine rotational speed cannot be increased, and there is a disadvantage that the vehicle runs sluggishly.

Such a sluggish running of the vehicle has a disadvantage that it is disadvantageous in use conditions for a vehicle such as a snowmobile, which is required to be able to start immediately after starting.

[Object of the invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle with an improper air-fuel ratio when starting immediately after starting an internal combustion engine having a clutch mechanism that is mounted on a vehicle and that is engaged when the engine speed exceeds a combined engine speed. It is an object of the present invention to realize a starting-time rotational speed control device capable of eliminating the backlash.

[Means for solving the problem]

In order to achieve this object, the present invention relates to starting fuel injection at the time of starting the internal combustion engine having a clutch mechanism that is mounted on a vehicle and has a clutch mechanism that is engaged when the engine speed exceeds a combined engine speed. In a start-up rotation speed control device for controlling the fuel supply so as to correct and supply the fuel within a predetermined time from the start of the start by the control, when the fuel is corrected and injected and supplied by the start-time fuel injection control, the engine is started. The fuel amount is gradually increased and corrected in accordance with the rising state of the combined engine speed to the combined engine speed. Control is performed so as to supply the fuel, and the throttle opening is not less than the set throttle opening and the engine speed is not less than the set engine speed. In this case, control means for shifting from the start-time fuel injection control to the basic fuel injection control and controlling to inject and supply a fuel amount by the basic fuel injection control is provided. And butterflies.

[Action]

According to the configuration of the present invention, when the control means opens the throttle valve to the set throttle opening or more to increase the engine speed to the set engine speed or more in order to start the vehicle immediately after the start of the internal combustion engine, By shifting from the fuel injection control to the basic fuel injection control and performing control to inject and supply the fuel amount by the basic fuel injection control, it is possible to obtain an engine output required for running the vehicle with an appropriate air-fuel ratio.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIGS. 1 to 7 show an embodiment of a starting speed control device according to the present invention. In FIG. 1, 2 is an internal combustion engine, 4 is a crankcase, 6 is a crankshaft, 8 is a combustion chamber,
10 is a piston and 12 is a spark plug. The internal combustion engine 2 in this embodiment is a so-called two-cycle internal combustion engine in which the crank performs two strokes of a scavenging and compression stroke and an expansion and absorption stroke during one rotation of the shaft 6, and uses this as one cycle. It is. The internal combustion engine 2 is mounted on a vehicle (not shown), and is coupled when the engine speed exceeds the combined engine speed (for example, a clutch mechanism (not shown), for example).
Centrifugal automatic start clutch, etc.).

An intake passage 14 communicates with the crank chamber 4 of the internal combustion engine 2. A throttle valve 16 is provided in the intake passage 14, and a fuel injection valve 18 is provided to face the crank chamber 4. The ignition plug 12 provided in the combustion chamber 8 is connected to an ignition circuit 20. The ignition circuit 20 ignites the ignition plug 12 by a signal input from a pickup 22 which is driven to rotate by the crankshaft 6.

The air metered by the slot valve 16 and flowing through the intake passage 14 and the fuel injected and supplied by the fuel injection valve 18 flow into the crank chamber 4 as an air-fuel mixture,
And is ignited and combusted by the spark plug 12 and discharged outside through an exhaust passage (not shown). This combustion drives the piston 10 to drive the crankshaft 6. Crankshaft 6
As shown in FIG. 5, the driving force of the internal combustion engine 2 is transferred from a clutch mechanism (not shown) that is engaged when the engine speed N exceeds the combined engine speed CEN, such as a belt-type continuously variable transmission. ) To drive the vehicle (not shown).

The fuel injection valve 18 is connected to a fuel tank 26 through a fuel supply passage 24. A fuel pump 28 for pumping fuel and a fuel filter 30 for removing dust in the fuel are provided in the middle of the fuel supply passage 24. Also, the fuel injection valve 18
Is connected to the fuel tank 26 by a fuel pressure adjusting passage 32. In the middle of the fuel pressure adjusting passage 32, a fuel pressure adjusting valve 34 is provided. The fuel pressure regulating valve 34 regulates the fuel pressure fed to the fuel injection valve 18 to a predetermined pressure by the intake pressure of the intake passage 14, and returns excess fuel to the fuel tank 26 through the fuel pressure regulating passage 32.

The fuel injection valve 18 is connected via a resistor 36 to a control unit 38 as control means. The fuel pump 26
Is connected to the control unit 38 via a pump relay 40, and is powered off by a battery 52 described later.

The control unit 38 includes an ignition circuit for detecting the engine speed.
20, a throttle opening sensor 42 for detecting a throttle opening of the slot valve 16, a water temperature sensor 44 for detecting a cooling water temperature of the internal combustion engine 2, an intake air temperature sensor 46 for detecting an intake air temperature, and detecting an atmospheric pressure. And an atmospheric pressure sensor 48 connected thereto. The atmospheric pressure sensor 48 is provided in the control unit 38.

Further, the control unit 38 includes a control unit relay 50 for turning off / on the power.
Is connected to the battery 52 via the. The control unit relay 50 is turned on and off by the ignition switch 54, and supplies power to the control unit 38. Reference numeral 56 denotes a control unit relay fuse interposed between the control unit relay 50 and the battery 52. Reference numeral 58 is an ignition switch
An ignition switch fuse interposed between the battery 54 and the battery 52. Reference numeral 60 denotes the pump relay 40
And a pump relay fuse interposed between the battery and the battery 52.

The control unit 38 controls the operation of the fuel injection valve 18 based on signals input from the sensors 20 and 42 to 48. That is, except when the internal combustion engine 2 is started, control is performed such that the fuel amount calculated from the map of the throttle opening (α) and the engine speed (N) by the basic fuel injection control is injected and supplied by the fuel injection valve 18. I do.

Further, when the internal combustion engine 2 is started, the control unit 38 controls the basic fuel injection control so as to correct and inject the fuel amount within a predetermined time T from the start by the start-time fuel injection control. As shown in FIGS. 4 to 7, the start-time injection control includes a low rotation basic pulse, which is a low rotation basic, a rotation speed correction, a time correction, and an altitude correction. The low-speed basic pulse, the rotation speed correction, and the altitude correction are always performed in the basic fuel injection control. Further, the control of the engagement and disengagement of the clutch mechanism is performed by correcting the rotational speed. The conventional correction value of the rotation speed correction is set to a constant value in a rotation speed range from a certain rotation speed to a rising side as shown by a solid line in FIG.

As described above, the engine speed N
When the internal combustion engine 2 having the clutch mechanism that is engaged when the engine speed exceeds the coupled engine speed CEN is started, a predetermined time T from the start of the start by the start-time fuel injection control with respect to the basic fuel injection control.
In the figure, a start-time rotation speed control device for correcting the fuel amount and controlling the injection to supply the fuel is provided.
In accordance with the rising state of the combined engine speed CEN, the fuel amount is gradually increased and corrected so as to control the fuel supply so that the throttle opening α is equal to or more than the set throttle opening αCAN and the engine speed N is equal to the set engine speed NCAN. In the case described above, a control unit 38 is provided as control means for controlling the fuel injection control at the time of starting to the basic fuel injection control and controlling the fuel supply by the basic fuel injection control so as to inject and supply the fuel amount.

That is, at the start of the internal combustion engine 2 which is mounted on the vehicle and has a clutch mechanism that engages when the engine speed N exceeds the combined engine speed CEN as shown in FIG. In a start-up rotational speed control device for controlling the fuel amount to be corrected and supplied for injection within a predetermined time T from the start by start-up fuel injection control comprising basic, rotational speed correction, time correction and altitude correction,
38 is the fifth correction value of the rotation speed correction of the fuel injection control at the start.
As shown by a broken line in the figure, the engine speed is gradually increased from a predetermined engine speed CVEN lower than the combined engine speed CEN toward the combined engine speed CEN, and the fuel amount is corrected and supplied by the fuel injection control at the start. 3, the fuel amount is gradually increased in accordance with the increase in the engine speed N to the combined engine speed CEN as shown in FIG. Control as much as possible,
When the throttle opening α is equal to or more than the set throttle opening αCAN and the engine speed N is equal to or more than the set engine speed NCAN set to be less than the predetermined engine speed CVEN, the control shifts from the fuel injection control at start-up to the basic fuel injection control. Then, control is performed to inject and supply the fuel amount by the basic fuel injection control.

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

When the control starts (100), the control unit 38 determines whether or not a predetermined time T has elapsed since the start of the internal combustion engine 2 (101).
I do.

When the predetermined time T has elapsed after the start of the internal combustion engine 2 (101: NO), it is calculated from a map of the throttle opening (α) and the engine speed (N) by the basic fuel injection control (102). The fuel amount is controlled so as to be injected and supplied by the fuel injection valve 18, and an end (103) is reached.

If within a predetermined time T after the start of the internal combustion engine 2 (101: YE
S) determines the magnitude of the throttle opening α and the set throttle opening αCAN (104).

The throttle opening α is less than the set throttle opening αCAN (1
04: α <αCAN), the fuel injection at start-up comprising a low-speed basic pulse and a rotational speed correction, a time correction and an altitude correction in which the correction value is set by gradually increasing as shown by the broken line in FIG. The fuel amount is gradually increased and corrected by control
Control (105) to inject and supply by 18 and end (103)
become.

At this time, in the start-time fuel injection control, when the engine speed N is less than the predetermined engine speed CVEN (N <CVEN), the start including the low-speed basic pulse, the speed correction, the time correction, and the altitude correction. When the engine speed N is equal to or higher than the predetermined engine speed CVEN (N ≧ CVEN), the fuel amount is gradually increased and corrected as described above. Control the injection supply.

In this manner, the correction value of the rotation speed correction of the fuel injection control at the time of starting is gradually increased from the predetermined engine rotation speed CVEN lower than the coupling engine rotation speed CEN toward the coupling engine rotation speed CEN as shown by a broken line in FIG. As shown in FIG. 3, when the fuel is injected and supplied after correcting the fuel amount by the fuel injection control at the start, the correction is performed by gradually increasing the engine speed N according to the rising state of the combined engine speed CEN. By controlling the injection amount by gradually increasing the fuel amount by the rotation speed correction that sets the value, the air-fuel ratio is over-concentrated, the engine output is reduced, the engine rotation speed is lowered, and the clutch mechanism is connected. Prohibition.

For this reason, when the internal combustion engine 2 having the clutch mechanism engaged when the engine speed N exceeds the combined engine speed CEN, the fuel supply is corrected by starting fuel injection control with respect to the basic fuel injection control by starting fuel injection control. When controlling to
Unnecessary increase in engine speed can be prevented, and coupling of the clutch mechanism can be prevented. Thereby, the problem that the driving force of the internal combustion engine 2 is transmitted to the traveling mechanism can be solved.

When the throttle opening α is equal to or larger than the set throttle opening αCAN (104: α ≧ αCAN), the magnitude of the engine speed N and the set engine speed NCAN set to be lower than the predetermined engine speed CVEN is determined ( 106) Yes.

The engine speed N is less than the set engine speed NCAN (106; N <NCA
In the case of N), the step 105 is executed, and the end (10
3)

On the other hand, the engine speed N is equal to or higher than the set engine speed NCAN (106;
If N ≧ NCAN), control is performed so that the fuel amount by the basic fuel injection control is injected and supplied by the fuel injection valve 18 (107),
End (103).

That is, when starting immediately after the start of the internal combustion engine 2, the control unit 38 opens the throttle valve 16 of the internal combustion engine 2 to the throttle opening αCAN or more and sets the engine speed N to less than the predetermined engine speed CVEN. Set engine speed set
When it is increased to NCAN or more, the engine shifts from start-time fuel injection control to basic fuel injection control, controls to inject and supply the fuel amount by this basic fuel injection control, and the engine required for running the vehicle with an appropriate air-fuel ratio The output is obtained and the prohibition of coupling of the clutch mechanism is released.

Therefore, when the engine is started immediately after starting the internal combustion engine 2 which is mounted on the vehicle and has a clutch mechanism that engages when the engine speed exceeds the combined engine speed, the air-fuel ratio obtained by correcting the engine speed during start-up fuel injection control. By shifting the over-concentration to the basic fuel injection control, an appropriate air-fuel ratio can be obtained, and the backlash of the vehicle due to an inappropriate air-fuel ratio can be eliminated.

〔The invention's effect〕

As described above, according to the present invention, when the control means opens the throttle valve to the set throttle opening or more to increase the engine speed to the set engine speed or more to start the vehicle immediately after the start of the internal combustion engine, The engine output required for running the vehicle can be obtained with an appropriate air-fuel ratio by shifting from the hour fuel injection control to the basic fuel injection control and performing control to inject and supply the fuel amount by the basic fuel injection control. .

Therefore, when the internal combustion engine is mounted on the vehicle and has a clutch mechanism that engages when the engine rotational speed exceeds the coupled engine rotational speed and starts immediately after the start, the running of the vehicle due to an improper air-fuel ratio is eliminated. can do.

[Brief description of the drawings]

1 to 7 show an embodiment of the present invention, FIG. 1 is a schematic configuration diagram of a starting speed control device, FIG. 2 is a control flowchart, FIG. 3 is a control block diagram, and FIG. FIG. 5 is an explanatory view of a low-speed basic pulse of the fuel injection control at the start, FIG. 5 is an explanatory view of rotation speed correction of the fuel injection control at the start, FIG. 6 is an explanatory view of time correction of the fuel injection control at the start, FIG. FIG. 4 is an explanatory diagram of altitude correction of fuel injection control at start. In the figure, 2 is an internal combustion engine, 14 is an intake passage, 16 is a throttle valve, 18 is a fuel injection valve, 20 is an ignition circuit, 24 is a fuel supply passage, 26 is a fuel tank, 28 is a fuel pump, and 32 is fuel pressure adjustment. A passage, 34 is a fuel pressure regulating valve, 38 is a control unit, 42 is a throttle opening sensor, 44 is a water temperature sensor, 46 is an intake air temperature sensor, 48 is an atmospheric pressure sensor, 52 is a battery, and 54 is an ignition switch.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuru Miyata 1671-1, Kasukawa-cho, Isesaki-shi, Gunma Japan Electronic Equipment Co., Ltd. (72) Inventor Tomoyuki Hirose 1671-1, Kasukawa-cho, Isesaki-shi, Gunma Japan Electronic Equipment Co., Ltd. (56) References JP-A-2-30940 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02D 41/06

Claims (1)

(57) [Claims] When the internal combustion engine is mounted on a vehicle and has a clutch mechanism that engages when the engine speed exceeds a combined engine speed, a predetermined fuel injection control is applied to the basic fuel injection control when the internal combustion engine is started. In the starting rotation speed control device for controlling the fuel supply to be corrected and supplied during the time, the combined engine of the engine speed is controlled when the fuel amount is corrected and injected and supplied by the starting fuel injection control. If the throttle opening is equal to or greater than the set throttle opening and the engine speed is equal to or greater than the set engine speed, the fuel is controlled at the time of starting. A control means for shifting from the injection control to the basic fuel injection control and controlling the fuel supply by the basic fuel injection control so as to inject and supply the fuel amount; Apparatus.